Context.cpp revision 9bdbaa0c895fc4558041bc0c23e7b4e4440fdf5e 
1// SwiftShader Software Renderer
2//
3// Copyright(c) 2005-2013 TransGaming Inc.
4//
5// All rights reserved. No part of this software may be copied, distributed, transmitted,
6// transcribed, stored in a retrieval system, translated into any human or computer
7// language by any means, or disclosed to third parties without the explicit written
8// agreement of TransGaming Inc. Without such an agreement, no rights or licenses, express
9// or implied, including but not limited to any patent rights, are granted to you.
10//
11
12// Context.cpp: Implements the es2::Context class, managing all GL state and performing
13// rendering operations. It is the GLES2 specific implementation of EGLContext.
14
15#include "Context.h"
16
17#include "main.h"
18#include "mathutil.h"
19#include "utilities.h"
20#include "ResourceManager.h"
21#include "Buffer.h"
22#include "Fence.h"
23#include "Framebuffer.h"
24#include "Program.h"
25#include "Query.h"
26#include "Renderbuffer.h"
27#include "Sampler.h"
28#include "Shader.h"
29#include "Texture.h"
30#include "TransformFeedback.h"
31#include "VertexArray.h"
32#include "VertexDataManager.h"
33#include "IndexDataManager.h"
34#include "libEGL/Display.h"
35#include "libEGL/Surface.h"
36#include "Common/Half.hpp"
37
38#include <EGL/eglext.h>
39
40namespace es2
41{
42Context::Context(const egl::Config *config, const Context *shareContext, EGLint clientVersion)
43	: clientVersion(clientVersion), mConfig(config)
44{
45	sw::Context *context = new sw::Context();
46	device = new es2::Device(context);
47
48    mFenceNameSpace.setBaseHandle(0);
49
50    setClearColor(0.0f, 0.0f, 0.0f, 0.0f);
51
52    mState.depthClearValue = 1.0f;
53    mState.stencilClearValue = 0;
54
55    mState.cullFaceEnabled = false;
56    mState.cullMode = GL_BACK;
57    mState.frontFace = GL_CCW;
58    mState.depthTestEnabled = false;
59    mState.depthFunc = GL_LESS;
60    mState.blendEnabled = false;
61    mState.sourceBlendRGB = GL_ONE;
62    mState.sourceBlendAlpha = GL_ONE;
63    mState.destBlendRGB = GL_ZERO;
64    mState.destBlendAlpha = GL_ZERO;
65    mState.blendEquationRGB = GL_FUNC_ADD;
66    mState.blendEquationAlpha = GL_FUNC_ADD;
67    mState.blendColor.red = 0;
68    mState.blendColor.green = 0;
69    mState.blendColor.blue = 0;
70    mState.blendColor.alpha = 0;
71    mState.stencilTestEnabled = false;
72    mState.stencilFunc = GL_ALWAYS;
73    mState.stencilRef = 0;
74    mState.stencilMask = -1;
75    mState.stencilWritemask = -1;
76    mState.stencilBackFunc = GL_ALWAYS;
77    mState.stencilBackRef = 0;
78    mState.stencilBackMask = - 1;
79    mState.stencilBackWritemask = -1;
80    mState.stencilFail = GL_KEEP;
81    mState.stencilPassDepthFail = GL_KEEP;
82    mState.stencilPassDepthPass = GL_KEEP;
83    mState.stencilBackFail = GL_KEEP;
84    mState.stencilBackPassDepthFail = GL_KEEP;
85    mState.stencilBackPassDepthPass = GL_KEEP;
86    mState.polygonOffsetFillEnabled = false;
87    mState.polygonOffsetFactor = 0.0f;
88    mState.polygonOffsetUnits = 0.0f;
89    mState.sampleAlphaToCoverageEnabled = false;
90    mState.sampleCoverageEnabled = false;
91    mState.sampleCoverageValue = 1.0f;
92    mState.sampleCoverageInvert = false;
93    mState.scissorTestEnabled = false;
94    mState.ditherEnabled = true;
95    mState.primitiveRestartFixedIndexEnabled = false;
96    mState.rasterizerDiscardEnabled = false;
97    mState.generateMipmapHint = GL_DONT_CARE;
98    mState.fragmentShaderDerivativeHint = GL_DONT_CARE;
99
100    mState.lineWidth = 1.0f;
101
102    mState.viewportX = 0;
103    mState.viewportY = 0;
104    mState.viewportWidth = 0;
105    mState.viewportHeight = 0;
106    mState.zNear = 0.0f;
107    mState.zFar = 1.0f;
108
109    mState.scissorX = 0;
110    mState.scissorY = 0;
111    mState.scissorWidth = 0;
112    mState.scissorHeight = 0;
113
114    mState.colorMaskRed = true;
115    mState.colorMaskGreen = true;
116    mState.colorMaskBlue = true;
117    mState.colorMaskAlpha = true;
118    mState.depthMask = true;
119
120    if(shareContext != NULL)
121    {
122        mResourceManager = shareContext->mResourceManager;
123        mResourceManager->addRef();
124    }
125    else
126    {
127        mResourceManager = new ResourceManager();
128    }
129
130    // [OpenGL ES 2.0.24] section 3.7 page 83:
131    // In the initial state, TEXTURE_2D and TEXTURE_CUBE_MAP have twodimensional
132    // and cube map texture state vectors respectively associated with them.
133    // In order that access to these initial textures not be lost, they are treated as texture
134    // objects all of whose names are 0.
135
136    mTexture2DZero = new Texture2D(0);
137	mTexture3DZero = new Texture3D(0);
138	mTexture2DArrayZero = new Texture2DArray(0);
139    mTextureCubeMapZero = new TextureCubeMap(0);
140    mTextureExternalZero = new TextureExternal(0);
141
142    mState.activeSampler = 0;
143	bindVertexArray(0);
144    bindArrayBuffer(0);
145    bindElementArrayBuffer(0);
146    bindTextureCubeMap(0);
147    bindTexture2D(0);
148    bindReadFramebuffer(0);
149    bindDrawFramebuffer(0);
150    bindRenderbuffer(0);
151    bindGenericUniformBuffer(0);
152    bindTransformFeedback(0);
153
154    mState.currentProgram = 0;
155
156    mState.packAlignment = 4;
157	mState.unpackInfo.alignment = 4;
158	mState.packRowLength = 0;
159	mState.packImageHeight = 0;
160	mState.packSkipPixels = 0;
161	mState.packSkipRows = 0;
162	mState.packSkipImages = 0;
163	mState.unpackInfo.rowLength = 0;
164	mState.unpackInfo.imageHeight = 0;
165	mState.unpackInfo.skipPixels = 0;
166	mState.unpackInfo.skipRows = 0;
167	mState.unpackInfo.skipImages = 0;
168
169    mVertexDataManager = NULL;
170    mIndexDataManager = NULL;
171
172    mInvalidEnum = false;
173    mInvalidValue = false;
174    mInvalidOperation = false;
175    mOutOfMemory = false;
176    mInvalidFramebufferOperation = false;
177
178    mHasBeenCurrent = false;
179
180    markAllStateDirty();
181}
182
183Context::~Context()
184{
185	if(mState.currentProgram != 0)
186	{
187		Program *programObject = mResourceManager->getProgram(mState.currentProgram);
188		if(programObject)
189		{
190			programObject->release();
191		}
192		mState.currentProgram = 0;
193	}
194
195	while(!mFramebufferMap.empty())
196	{
197		deleteFramebuffer(mFramebufferMap.begin()->first);
198	}
199
200	while(!mFenceMap.empty())
201	{
202		deleteFence(mFenceMap.begin()->first);
203	}
204
205	while(!mQueryMap.empty())
206	{
207		deleteQuery(mQueryMap.begin()->first);
208	}
209
210	while(!mVertexArrayMap.empty())
211	{
212		deleteVertexArray(mVertexArrayMap.begin()->first);
213	}
214
215	while(!mTransformFeedbackMap.empty())
216	{
217		deleteTransformFeedback(mTransformFeedbackMap.begin()->first);
218	}
219
220	for(int type = 0; type < TEXTURE_TYPE_COUNT; type++)
221	{
222		for(int sampler = 0; sampler < MAX_COMBINED_TEXTURE_IMAGE_UNITS; sampler++)
223		{
224			mState.samplerTexture[type][sampler] = NULL;
225		}
226	}
227
228	for(int i = 0; i < MAX_VERTEX_ATTRIBS; i++)
229	{
230		mState.vertexAttribute[i].mBoundBuffer = NULL;
231	}
232
233	for(int i = 0; i < QUERY_TYPE_COUNT; i++)
234	{
235		mState.activeQuery[i] = NULL;
236	}
237
238	mState.arrayBuffer = NULL;
239	mState.copyReadBuffer = NULL;
240	mState.copyWriteBuffer = NULL;
241	mState.pixelPackBuffer = NULL;
242	mState.pixelUnpackBuffer = NULL;
243	mState.genericUniformBuffer = NULL;
244	mState.renderbuffer = NULL;
245
246	for(int i = 0; i < MAX_COMBINED_TEXTURE_IMAGE_UNITS; ++i)
247	{
248		mState.sampler[i] = NULL;
249	}
250
251    mTexture2DZero = NULL;
252	mTexture3DZero = NULL;
253	mTexture2DArrayZero = NULL;
254    mTextureCubeMapZero = NULL;
255    mTextureExternalZero = NULL;
256
257    delete mVertexDataManager;
258    delete mIndexDataManager;
259
260    mResourceManager->release();
261	delete device;
262}
263
264void Context::makeCurrent(egl::Surface *surface)
265{
266    if(!mHasBeenCurrent)
267    {
268        mVertexDataManager = new VertexDataManager(this);
269        mIndexDataManager = new IndexDataManager();
270
271        mState.viewportX = 0;
272        mState.viewportY = 0;
273        mState.viewportWidth = surface->getWidth();
274        mState.viewportHeight = surface->getHeight();
275
276        mState.scissorX = 0;
277        mState.scissorY = 0;
278        mState.scissorWidth = surface->getWidth();
279        mState.scissorHeight = surface->getHeight();
280
281        mHasBeenCurrent = true;
282    }
283
284    // Wrap the existing resources into GL objects and assign them to the '0' names
285    egl::Image *defaultRenderTarget = surface->getRenderTarget();
286    egl::Image *depthStencil = surface->getDepthStencil();
287
288    Colorbuffer *colorbufferZero = new Colorbuffer(defaultRenderTarget);
289    DepthStencilbuffer *depthStencilbufferZero = new DepthStencilbuffer(depthStencil);
290    Framebuffer *framebufferZero = new DefaultFramebuffer(colorbufferZero, depthStencilbufferZero);
291
292    setFramebufferZero(framebufferZero);
293
294    if(defaultRenderTarget)
295    {
296        defaultRenderTarget->release();
297    }
298
299    if(depthStencil)
300    {
301        depthStencil->release();
302    }
303
304    markAllStateDirty();
305}
306
307EGLint Context::getClientVersion() const
308{
309	return clientVersion;
310}
311
312// This function will set all of the state-related dirty flags, so that all state is set during next pre-draw.
313void Context::markAllStateDirty()
314{
315    mAppliedProgramSerial = 0;
316
317    mDepthStateDirty = true;
318    mMaskStateDirty = true;
319    mBlendStateDirty = true;
320    mStencilStateDirty = true;
321    mPolygonOffsetStateDirty = true;
322    mSampleStateDirty = true;
323    mDitherStateDirty = true;
324    mFrontFaceDirty = true;
325}
326
327void Context::setClearColor(float red, float green, float blue, float alpha)
328{
329    mState.colorClearValue.red = red;
330    mState.colorClearValue.green = green;
331    mState.colorClearValue.blue = blue;
332    mState.colorClearValue.alpha = alpha;
333}
334
335void Context::setClearDepth(float depth)
336{
337    mState.depthClearValue = depth;
338}
339
340void Context::setClearStencil(int stencil)
341{
342    mState.stencilClearValue = stencil;
343}
344
345void Context::setCullFaceEnabled(bool enabled)
346{
347    mState.cullFaceEnabled = enabled;
348}
349
350bool Context::isCullFaceEnabled() const
351{
352    return mState.cullFaceEnabled;
353}
354
355void Context::setCullMode(GLenum mode)
356{
357   mState.cullMode = mode;
358}
359
360void Context::setFrontFace(GLenum front)
361{
362    if(mState.frontFace != front)
363    {
364        mState.frontFace = front;
365        mFrontFaceDirty = true;
366    }
367}
368
369void Context::setDepthTestEnabled(bool enabled)
370{
371    if(mState.depthTestEnabled != enabled)
372    {
373        mState.depthTestEnabled = enabled;
374        mDepthStateDirty = true;
375    }
376}
377
378bool Context::isDepthTestEnabled() const
379{
380    return mState.depthTestEnabled;
381}
382
383void Context::setDepthFunc(GLenum depthFunc)
384{
385    if(mState.depthFunc != depthFunc)
386    {
387        mState.depthFunc = depthFunc;
388        mDepthStateDirty = true;
389    }
390}
391
392void Context::setDepthRange(float zNear, float zFar)
393{
394    mState.zNear = zNear;
395    mState.zFar = zFar;
396}
397
398void Context::setBlendEnabled(bool enabled)
399{
400    if(mState.blendEnabled != enabled)
401    {
402        mState.blendEnabled = enabled;
403        mBlendStateDirty = true;
404    }
405}
406
407bool Context::isBlendEnabled() const
408{
409    return mState.blendEnabled;
410}
411
412void Context::setBlendFactors(GLenum sourceRGB, GLenum destRGB, GLenum sourceAlpha, GLenum destAlpha)
413{
414    if(mState.sourceBlendRGB != sourceRGB ||
415       mState.sourceBlendAlpha != sourceAlpha ||
416       mState.destBlendRGB != destRGB ||
417       mState.destBlendAlpha != destAlpha)
418    {
419        mState.sourceBlendRGB = sourceRGB;
420        mState.destBlendRGB = destRGB;
421        mState.sourceBlendAlpha = sourceAlpha;
422        mState.destBlendAlpha = destAlpha;
423        mBlendStateDirty = true;
424    }
425}
426
427void Context::setBlendColor(float red, float green, float blue, float alpha)
428{
429    if(mState.blendColor.red != red ||
430       mState.blendColor.green != green ||
431       mState.blendColor.blue != blue ||
432       mState.blendColor.alpha != alpha)
433    {
434        mState.blendColor.red = red;
435        mState.blendColor.green = green;
436        mState.blendColor.blue = blue;
437        mState.blendColor.alpha = alpha;
438        mBlendStateDirty = true;
439    }
440}
441
442void Context::setBlendEquation(GLenum rgbEquation, GLenum alphaEquation)
443{
444    if(mState.blendEquationRGB != rgbEquation ||
445       mState.blendEquationAlpha != alphaEquation)
446    {
447        mState.blendEquationRGB = rgbEquation;
448        mState.blendEquationAlpha = alphaEquation;
449        mBlendStateDirty = true;
450    }
451}
452
453void Context::setStencilTestEnabled(bool enabled)
454{
455    if(mState.stencilTestEnabled != enabled)
456    {
457        mState.stencilTestEnabled = enabled;
458        mStencilStateDirty = true;
459    }
460}
461
462bool Context::isStencilTestEnabled() const
463{
464    return mState.stencilTestEnabled;
465}
466
467void Context::setStencilParams(GLenum stencilFunc, GLint stencilRef, GLuint stencilMask)
468{
469    if(mState.stencilFunc != stencilFunc ||
470       mState.stencilRef != stencilRef ||
471       mState.stencilMask != stencilMask)
472    {
473        mState.stencilFunc = stencilFunc;
474        mState.stencilRef = (stencilRef > 0) ? stencilRef : 0;
475        mState.stencilMask = stencilMask;
476        mStencilStateDirty = true;
477    }
478}
479
480void Context::setStencilBackParams(GLenum stencilBackFunc, GLint stencilBackRef, GLuint stencilBackMask)
481{
482    if(mState.stencilBackFunc != stencilBackFunc ||
483       mState.stencilBackRef != stencilBackRef ||
484       mState.stencilBackMask != stencilBackMask)
485    {
486        mState.stencilBackFunc = stencilBackFunc;
487        mState.stencilBackRef = (stencilBackRef > 0) ? stencilBackRef : 0;
488        mState.stencilBackMask = stencilBackMask;
489        mStencilStateDirty = true;
490    }
491}
492
493void Context::setStencilWritemask(GLuint stencilWritemask)
494{
495    if(mState.stencilWritemask != stencilWritemask)
496    {
497        mState.stencilWritemask = stencilWritemask;
498        mStencilStateDirty = true;
499    }
500}
501
502void Context::setStencilBackWritemask(GLuint stencilBackWritemask)
503{
504    if(mState.stencilBackWritemask != stencilBackWritemask)
505    {
506        mState.stencilBackWritemask = stencilBackWritemask;
507        mStencilStateDirty = true;
508    }
509}
510
511void Context::setStencilOperations(GLenum stencilFail, GLenum stencilPassDepthFail, GLenum stencilPassDepthPass)
512{
513    if(mState.stencilFail != stencilFail ||
514       mState.stencilPassDepthFail != stencilPassDepthFail ||
515       mState.stencilPassDepthPass != stencilPassDepthPass)
516    {
517        mState.stencilFail = stencilFail;
518        mState.stencilPassDepthFail = stencilPassDepthFail;
519        mState.stencilPassDepthPass = stencilPassDepthPass;
520        mStencilStateDirty = true;
521    }
522}
523
524void Context::setStencilBackOperations(GLenum stencilBackFail, GLenum stencilBackPassDepthFail, GLenum stencilBackPassDepthPass)
525{
526    if(mState.stencilBackFail != stencilBackFail ||
527       mState.stencilBackPassDepthFail != stencilBackPassDepthFail ||
528       mState.stencilBackPassDepthPass != stencilBackPassDepthPass)
529    {
530        mState.stencilBackFail = stencilBackFail;
531        mState.stencilBackPassDepthFail = stencilBackPassDepthFail;
532        mState.stencilBackPassDepthPass = stencilBackPassDepthPass;
533        mStencilStateDirty = true;
534    }
535}
536
537void Context::setPolygonOffsetFillEnabled(bool enabled)
538{
539    if(mState.polygonOffsetFillEnabled != enabled)
540    {
541        mState.polygonOffsetFillEnabled = enabled;
542        mPolygonOffsetStateDirty = true;
543    }
544}
545
546bool Context::isPolygonOffsetFillEnabled() const
547{
548    return mState.polygonOffsetFillEnabled;
549}
550
551void Context::setPolygonOffsetParams(GLfloat factor, GLfloat units)
552{
553    if(mState.polygonOffsetFactor != factor ||
554       mState.polygonOffsetUnits != units)
555    {
556        mState.polygonOffsetFactor = factor;
557        mState.polygonOffsetUnits = units;
558        mPolygonOffsetStateDirty = true;
559    }
560}
561
562void Context::setSampleAlphaToCoverageEnabled(bool enabled)
563{
564    if(mState.sampleAlphaToCoverageEnabled != enabled)
565    {
566        mState.sampleAlphaToCoverageEnabled = enabled;
567        mSampleStateDirty = true;
568    }
569}
570
571bool Context::isSampleAlphaToCoverageEnabled() const
572{
573    return mState.sampleAlphaToCoverageEnabled;
574}
575
576void Context::setSampleCoverageEnabled(bool enabled)
577{
578    if(mState.sampleCoverageEnabled != enabled)
579    {
580        mState.sampleCoverageEnabled = enabled;
581        mSampleStateDirty = true;
582    }
583}
584
585bool Context::isSampleCoverageEnabled() const
586{
587    return mState.sampleCoverageEnabled;
588}
589
590void Context::setSampleCoverageParams(GLclampf value, bool invert)
591{
592    if(mState.sampleCoverageValue != value ||
593       mState.sampleCoverageInvert != invert)
594    {
595        mState.sampleCoverageValue = value;
596        mState.sampleCoverageInvert = invert;
597        mSampleStateDirty = true;
598    }
599}
600
601void Context::setScissorTestEnabled(bool enabled)
602{
603    mState.scissorTestEnabled = enabled;
604}
605
606bool Context::isScissorTestEnabled() const
607{
608    return mState.scissorTestEnabled;
609}
610
611void Context::setDitherEnabled(bool enabled)
612{
613    if(mState.ditherEnabled != enabled)
614    {
615        mState.ditherEnabled = enabled;
616        mDitherStateDirty = true;
617    }
618}
619
620bool Context::isDitherEnabled() const
621{
622    return mState.ditherEnabled;
623}
624
625void Context::setPrimitiveRestartFixedIndexEnabled(bool enabled)
626{
627    UNIMPLEMENTED();
628    mState.primitiveRestartFixedIndexEnabled = enabled;
629}
630
631bool Context::isPrimitiveRestartFixedIndexEnabled() const
632{
633    return mState.primitiveRestartFixedIndexEnabled;
634}
635
636void Context::setRasterizerDiscardEnabled(bool enabled)
637{
638    UNIMPLEMENTED();
639    mState.rasterizerDiscardEnabled = enabled;
640}
641
642bool Context::isRasterizerDiscardEnabled() const
643{
644    return mState.rasterizerDiscardEnabled;
645}
646
647void Context::setLineWidth(GLfloat width)
648{
649    mState.lineWidth = width;
650	device->setLineWidth(clamp(width, ALIASED_LINE_WIDTH_RANGE_MIN, ALIASED_LINE_WIDTH_RANGE_MAX));
651}
652
653void Context::setGenerateMipmapHint(GLenum hint)
654{
655    mState.generateMipmapHint = hint;
656}
657
658void Context::setFragmentShaderDerivativeHint(GLenum hint)
659{
660    mState.fragmentShaderDerivativeHint = hint;
661    // TODO: Propagate the hint to shader translator so we can write
662    // ddx, ddx_coarse, or ddx_fine depending on the hint.
663    // Ignore for now. It is valid for implementations to ignore hint.
664}
665
666void Context::setViewportParams(GLint x, GLint y, GLsizei width, GLsizei height)
667{
668    mState.viewportX = x;
669    mState.viewportY = y;
670    mState.viewportWidth = width;
671    mState.viewportHeight = height;
672}
673
674void Context::setScissorParams(GLint x, GLint y, GLsizei width, GLsizei height)
675{
676    mState.scissorX = x;
677    mState.scissorY = y;
678    mState.scissorWidth = width;
679    mState.scissorHeight = height;
680}
681
682void Context::setColorMask(bool red, bool green, bool blue, bool alpha)
683{
684    if(mState.colorMaskRed != red || mState.colorMaskGreen != green ||
685       mState.colorMaskBlue != blue || mState.colorMaskAlpha != alpha)
686    {
687        mState.colorMaskRed = red;
688        mState.colorMaskGreen = green;
689        mState.colorMaskBlue = blue;
690        mState.colorMaskAlpha = alpha;
691        mMaskStateDirty = true;
692    }
693}
694
695unsigned int Context::getColorMask() const
696{
697	return (mState.colorMaskRed ? 0x1 : 0) |
698	       (mState.colorMaskGreen ? 0x2 : 0) |
699	       (mState.colorMaskBlue ? 0x4 : 0) |
700	       (mState.colorMaskAlpha ? 0x8 : 0);
701}
702
703void Context::setDepthMask(bool mask)
704{
705    if(mState.depthMask != mask)
706    {
707        mState.depthMask = mask;
708        mMaskStateDirty = true;
709    }
710}
711
712void Context::setActiveSampler(unsigned int active)
713{
714    mState.activeSampler = active;
715}
716
717GLuint Context::getReadFramebufferName() const
718{
719    return mState.readFramebuffer;
720}
721
722GLuint Context::getDrawFramebufferName() const
723{
724    return mState.drawFramebuffer;
725}
726
727GLuint Context::getRenderbufferName() const
728{
729    return mState.renderbuffer.name();
730}
731
732void Context::setFramebufferReadBuffer(GLuint buf)
733{
734	getReadFramebuffer()->setReadBuffer(buf);
735}
736
737void Context::setFramebufferDrawBuffers(GLsizei n, const GLenum *bufs)
738{
739	Framebuffer* drawFramebuffer = getDrawFramebuffer();
740	for(int i = 0; i < n; ++i)
741	{
742		drawFramebuffer->setDrawBuffer(i, bufs[i]);
743	}
744}
745
746GLuint Context::getReadFramebufferColorIndex() const
747{
748	GLenum buf = getReadFramebuffer()->getReadBuffer();
749	switch(buf)
750	{
751	case GL_BACK:
752		return 0;
753	case GL_NONE:
754		return GL_INVALID_INDEX;
755	default:
756		return buf - GL_COLOR_ATTACHMENT0;
757}
758}
759
760GLuint Context::getArrayBufferName() const
761{
762    return mState.arrayBuffer.name();
763}
764
765GLuint Context::getElementArrayBufferName() const
766{
767	Buffer* elementArrayBuffer = getCurrentVertexArray()->getElementArrayBuffer();
768	return elementArrayBuffer ? elementArrayBuffer->name : 0;
769}
770
771GLuint Context::getActiveQuery(GLenum target) const
772{
773    Query *queryObject = NULL;
774
775    switch(target)
776    {
777    case GL_ANY_SAMPLES_PASSED_EXT:
778        queryObject = mState.activeQuery[QUERY_ANY_SAMPLES_PASSED];
779        break;
780    case GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT:
781        queryObject = mState.activeQuery[QUERY_ANY_SAMPLES_PASSED_CONSERVATIVE];
782        break;
783    case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
784        queryObject = mState.activeQuery[QUERY_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN];
785        break;
786    default:
787        ASSERT(false);
788    }
789
790    if(queryObject)
791    {
792        return queryObject->name;
793    }
794
795	return 0;
796}
797
798void Context::setVertexAttribArrayEnabled(unsigned int attribNum, bool enabled)
799{
800	getCurrentVertexArray()->enableAttribute(attribNum, enabled);
801}
802
803void Context::setVertexAttribDivisor(unsigned int attribNum, GLuint divisor)
804{
805	getCurrentVertexArray()->setVertexAttribDivisor(attribNum, divisor);
806}
807
808const VertexAttribute &Context::getVertexAttribState(unsigned int attribNum) const
809{
810	return getCurrentVertexArray()->getVertexAttribute(attribNum);
811}
812
813void Context::setVertexAttribState(unsigned int attribNum, Buffer *boundBuffer, GLint size, GLenum type, bool normalized,
814                                   GLsizei stride, const void *pointer)
815{
816	getCurrentVertexArray()->setAttributeState(attribNum, boundBuffer, size, type, normalized, stride, pointer);
817}
818
819const void *Context::getVertexAttribPointer(unsigned int attribNum) const
820{
821	return getCurrentVertexArray()->getVertexAttribute(attribNum).mPointer;
822}
823
824const VertexAttributeArray &Context::getVertexArrayAttributes()
825{
826	return getCurrentVertexArray()->getVertexAttributes();
827}
828
829const VertexAttributeArray &Context::getCurrentVertexAttributes()
830{
831	return mState.vertexAttribute;
832}
833
834void Context::setPackAlignment(GLint alignment)
835{
836    mState.packAlignment = alignment;
837}
838
839void Context::setUnpackAlignment(GLint alignment)
840{
841	mState.unpackInfo.alignment = alignment;
842}
843
844const egl::Image::UnpackInfo& Context::getUnpackInfo() const
845{
846	return mState.unpackInfo;
847}
848
849void Context::setPackRowLength(GLint rowLength)
850{
851	mState.packRowLength = rowLength;
852}
853
854void Context::setPackImageHeight(GLint imageHeight)
855{
856	mState.packImageHeight = imageHeight;
857}
858
859void Context::setPackSkipPixels(GLint skipPixels)
860{
861	mState.packSkipPixels = skipPixels;
862}
863
864void Context::setPackSkipRows(GLint skipRows)
865{
866	mState.packSkipRows = skipRows;
867}
868
869void Context::setPackSkipImages(GLint skipImages)
870{
871	mState.packSkipImages = skipImages;
872}
873
874void Context::setUnpackRowLength(GLint rowLength)
875{
876	mState.unpackInfo.rowLength = rowLength;
877}
878
879void Context::setUnpackImageHeight(GLint imageHeight)
880{
881	mState.unpackInfo.imageHeight = imageHeight;
882}
883
884void Context::setUnpackSkipPixels(GLint skipPixels)
885{
886	mState.unpackInfo.skipPixels = skipPixels;
887}
888
889void Context::setUnpackSkipRows(GLint skipRows)
890{
891	mState.unpackInfo.skipRows = skipRows;
892}
893
894void Context::setUnpackSkipImages(GLint skipImages)
895{
896	mState.unpackInfo.skipImages = skipImages;
897}
898
899GLuint Context::createBuffer()
900{
901    return mResourceManager->createBuffer();
902}
903
904GLuint Context::createProgram()
905{
906    return mResourceManager->createProgram();
907}
908
909GLuint Context::createShader(GLenum type)
910{
911    return mResourceManager->createShader(type);
912}
913
914GLuint Context::createTexture()
915{
916    return mResourceManager->createTexture();
917}
918
919GLuint Context::createRenderbuffer()
920{
921    return mResourceManager->createRenderbuffer();
922}
923
924// Returns an unused framebuffer name
925GLuint Context::createFramebuffer()
926{
927    GLuint handle = mFramebufferNameSpace.allocate();
928
929    mFramebufferMap[handle] = NULL;
930
931    return handle;
932}
933
934GLuint Context::createFence()
935{
936    GLuint handle = mFenceNameSpace.allocate();
937
938    mFenceMap[handle] = new Fence;
939
940    return handle;
941}
942
943// Returns an unused query name
944GLuint Context::createQuery()
945{
946    GLuint handle = mQueryNameSpace.allocate();
947
948    mQueryMap[handle] = NULL;
949
950    return handle;
951}
952
953// Returns an unused vertex array name
954GLuint Context::createVertexArray()
955{
956	GLuint handle = mVertexArrayNameSpace.allocate();
957
958	mVertexArrayMap[handle] = nullptr;
959
960	return handle;
961}
962
963GLsync Context::createFenceSync(GLenum condition, GLbitfield flags)
964{
965	GLuint handle = mResourceManager->createFenceSync(condition, flags);
966
967	return reinterpret_cast<GLsync>(static_cast<uintptr_t>(handle));
968}
969
970// Returns an unused transform feedback name
971GLuint Context::createTransformFeedback()
972{
973	GLuint handle = mTransformFeedbackNameSpace.allocate();
974
975	mTransformFeedbackMap[handle] = NULL;
976
977	return handle;
978}
979
980// Returns an unused sampler name
981GLuint Context::createSampler()
982{
983	return mResourceManager->createSampler();
984}
985
986void Context::deleteBuffer(GLuint buffer)
987{
988    if(mResourceManager->getBuffer(buffer))
989    {
990        detachBuffer(buffer);
991    }
992
993    mResourceManager->deleteBuffer(buffer);
994}
995
996void Context::deleteShader(GLuint shader)
997{
998    mResourceManager->deleteShader(shader);
999}
1000
1001void Context::deleteProgram(GLuint program)
1002{
1003    mResourceManager->deleteProgram(program);
1004}
1005
1006void Context::deleteTexture(GLuint texture)
1007{
1008    if(mResourceManager->getTexture(texture))
1009    {
1010        detachTexture(texture);
1011    }
1012
1013    mResourceManager->deleteTexture(texture);
1014}
1015
1016void Context::deleteRenderbuffer(GLuint renderbuffer)
1017{
1018    if(mResourceManager->getRenderbuffer(renderbuffer))
1019    {
1020        detachRenderbuffer(renderbuffer);
1021    }
1022
1023    mResourceManager->deleteRenderbuffer(renderbuffer);
1024}
1025
1026void Context::deleteFramebuffer(GLuint framebuffer)
1027{
1028    FramebufferMap::iterator framebufferObject = mFramebufferMap.find(framebuffer);
1029
1030    if(framebufferObject != mFramebufferMap.end())
1031    {
1032        detachFramebuffer(framebuffer);
1033
1034        mFramebufferNameSpace.release(framebufferObject->first);
1035        delete framebufferObject->second;
1036        mFramebufferMap.erase(framebufferObject);
1037    }
1038}
1039
1040void Context::deleteFence(GLuint fence)
1041{
1042    FenceMap::iterator fenceObject = mFenceMap.find(fence);
1043
1044    if(fenceObject != mFenceMap.end())
1045    {
1046        mFenceNameSpace.release(fenceObject->first);
1047        delete fenceObject->second;
1048        mFenceMap.erase(fenceObject);
1049    }
1050}
1051
1052void Context::deleteQuery(GLuint query)
1053{
1054    QueryMap::iterator queryObject = mQueryMap.find(query);
1055
1056	if(queryObject != mQueryMap.end())
1057    {
1058        mQueryNameSpace.release(queryObject->first);
1059
1060		if(queryObject->second)
1061        {
1062            queryObject->second->release();
1063        }
1064
1065		mQueryMap.erase(queryObject);
1066    }
1067}
1068
1069void Context::deleteVertexArray(GLuint vertexArray)
1070{
1071	VertexArrayMap::iterator vertexArrayObject = mVertexArrayMap.find(vertexArray);
1072
1073	if(vertexArrayObject != mVertexArrayMap.end())
1074	{
1075		// Vertex array detachment is handled by Context, because 0 is a valid
1076		// VAO, and a pointer to it must be passed from Context to State at
1077		// binding time.
1078
1079		// [OpenGL ES 3.0.2] section 2.10 page 43:
1080		// If a vertex array object that is currently bound is deleted, the binding
1081		// for that object reverts to zero and the default vertex array becomes current.
1082		if(getCurrentVertexArray()->name == vertexArray)
1083		{
1084			bindVertexArray(0);
1085		}
1086
1087		mVertexArrayNameSpace.release(vertexArrayObject->first);
1088		delete vertexArrayObject->second;
1089		mVertexArrayMap.erase(vertexArrayObject);
1090	}
1091}
1092
1093void Context::deleteFenceSync(GLsync fenceSync)
1094{
1095	// The spec specifies the underlying Fence object is not deleted until all current
1096	// wait commands finish. However, since the name becomes invalid, we cannot query the fence,
1097	// and since our API is currently designed for being called from a single thread, we can delete
1098	// the fence immediately.
1099	mResourceManager->deleteFenceSync(static_cast<GLuint>(reinterpret_cast<uintptr_t>(fenceSync)));
1100}
1101
1102void Context::deleteTransformFeedback(GLuint transformFeedback)
1103{
1104	TransformFeedbackMap::iterator transformFeedbackObject = mTransformFeedbackMap.find(transformFeedback);
1105
1106	if(transformFeedbackObject != mTransformFeedbackMap.end())
1107	{
1108		mTransformFeedbackNameSpace.release(transformFeedbackObject->first);
1109		delete transformFeedbackObject->second;
1110		mTransformFeedbackMap.erase(transformFeedbackObject);
1111	}
1112}
1113
1114void Context::deleteSampler(GLuint sampler)
1115{
1116	if(mResourceManager->getSampler(sampler))
1117	{
1118		detachSampler(sampler);
1119	}
1120
1121	mResourceManager->deleteSampler(sampler);
1122}
1123
1124Buffer *Context::getBuffer(GLuint handle) const
1125{
1126    return mResourceManager->getBuffer(handle);
1127}
1128
1129Shader *Context::getShader(GLuint handle) const
1130{
1131    return mResourceManager->getShader(handle);
1132}
1133
1134Program *Context::getProgram(GLuint handle) const
1135{
1136    return mResourceManager->getProgram(handle);
1137}
1138
1139Texture *Context::getTexture(GLuint handle) const
1140{
1141    return mResourceManager->getTexture(handle);
1142}
1143
1144Renderbuffer *Context::getRenderbuffer(GLuint handle) const
1145{
1146    return mResourceManager->getRenderbuffer(handle);
1147}
1148
1149Framebuffer *Context::getReadFramebuffer() const
1150{
1151    return getFramebuffer(mState.readFramebuffer);
1152}
1153
1154Framebuffer *Context::getDrawFramebuffer() const
1155{
1156    return getFramebuffer(mState.drawFramebuffer);
1157}
1158
1159void Context::bindArrayBuffer(unsigned int buffer)
1160{
1161    mResourceManager->checkBufferAllocation(buffer);
1162
1163    mState.arrayBuffer = getBuffer(buffer);
1164}
1165
1166void Context::bindElementArrayBuffer(unsigned int buffer)
1167{
1168    mResourceManager->checkBufferAllocation(buffer);
1169
1170	getCurrentVertexArray()->setElementArrayBuffer(getBuffer(buffer));
1171}
1172
1173void Context::bindCopyReadBuffer(GLuint buffer)
1174{
1175	mResourceManager->checkBufferAllocation(buffer);
1176
1177	mState.copyReadBuffer = getBuffer(buffer);
1178}
1179
1180void Context::bindCopyWriteBuffer(GLuint buffer)
1181{
1182	mResourceManager->checkBufferAllocation(buffer);
1183
1184	mState.copyWriteBuffer = getBuffer(buffer);
1185}
1186
1187void Context::bindPixelPackBuffer(GLuint buffer)
1188{
1189	mResourceManager->checkBufferAllocation(buffer);
1190
1191	mState.pixelPackBuffer = getBuffer(buffer);
1192}
1193
1194void Context::bindPixelUnpackBuffer(GLuint buffer)
1195{
1196	mResourceManager->checkBufferAllocation(buffer);
1197
1198	mState.pixelUnpackBuffer = getBuffer(buffer);
1199}
1200
1201void Context::bindTransformFeedbackBuffer(GLuint buffer)
1202{
1203	mResourceManager->checkBufferAllocation(buffer);
1204
1205	TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
1206
1207	if(transformFeedback)
1208	{
1209		transformFeedback->setGenericBuffer(getBuffer(buffer));
1210	}
1211}
1212
1213void Context::bindTexture2D(GLuint texture)
1214{
1215    mResourceManager->checkTextureAllocation(texture, TEXTURE_2D);
1216
1217    mState.samplerTexture[TEXTURE_2D][mState.activeSampler] = getTexture(texture);
1218}
1219
1220void Context::bindTextureCubeMap(GLuint texture)
1221{
1222    mResourceManager->checkTextureAllocation(texture, TEXTURE_CUBE);
1223
1224    mState.samplerTexture[TEXTURE_CUBE][mState.activeSampler] = getTexture(texture);
1225}
1226
1227void Context::bindTextureExternal(GLuint texture)
1228{
1229    mResourceManager->checkTextureAllocation(texture, TEXTURE_EXTERNAL);
1230
1231    mState.samplerTexture[TEXTURE_EXTERNAL][mState.activeSampler] = getTexture(texture);
1232}
1233
1234void Context::bindTexture3D(GLuint texture)
1235{
1236	mResourceManager->checkTextureAllocation(texture, TEXTURE_3D);
1237
1238	mState.samplerTexture[TEXTURE_3D][mState.activeSampler] = getTexture(texture);
1239}
1240
1241void Context::bindTexture2DArray(GLuint texture)
1242{
1243	mResourceManager->checkTextureAllocation(texture, TEXTURE_2D_ARRAY);
1244
1245	mState.samplerTexture[TEXTURE_2D_ARRAY][mState.activeSampler] = getTexture(texture);
1246}
1247
1248void Context::bindReadFramebuffer(GLuint framebuffer)
1249{
1250    if(!getFramebuffer(framebuffer))
1251    {
1252        mFramebufferMap[framebuffer] = new Framebuffer();
1253    }
1254
1255    mState.readFramebuffer = framebuffer;
1256}
1257
1258void Context::bindDrawFramebuffer(GLuint framebuffer)
1259{
1260    if(!getFramebuffer(framebuffer))
1261    {
1262        mFramebufferMap[framebuffer] = new Framebuffer();
1263    }
1264
1265    mState.drawFramebuffer = framebuffer;
1266}
1267
1268void Context::bindRenderbuffer(GLuint renderbuffer)
1269{
1270	mResourceManager->checkRenderbufferAllocation(renderbuffer);
1271
1272    mState.renderbuffer = getRenderbuffer(renderbuffer);
1273}
1274
1275void Context::bindVertexArray(GLuint array)
1276{
1277	VertexArray *vertexArray = getVertexArray(array);
1278
1279	if(!vertexArray)
1280	{
1281		vertexArray = new VertexArray(array);
1282		mVertexArrayMap[array] = vertexArray;
1283	}
1284
1285	mState.vertexArray = array;
1286}
1287
1288void Context::bindGenericUniformBuffer(GLuint buffer)
1289{
1290	mResourceManager->checkBufferAllocation(buffer);
1291
1292	mState.genericUniformBuffer = getBuffer(buffer);
1293}
1294
1295void Context::bindIndexedUniformBuffer(GLuint buffer, GLuint index, GLintptr offset, GLsizeiptr size)
1296{
1297	mResourceManager->checkBufferAllocation(buffer);
1298
1299	Buffer* bufferObject = getBuffer(buffer);
1300	mState.uniformBuffers[index].set(bufferObject, offset, size);
1301}
1302
1303void Context::bindGenericTransformFeedbackBuffer(GLuint buffer)
1304{
1305	mResourceManager->checkBufferAllocation(buffer);
1306
1307	getTransformFeedback()->setGenericBuffer(getBuffer(buffer));
1308}
1309
1310void Context::bindIndexedTransformFeedbackBuffer(GLuint buffer, GLuint index, GLintptr offset, GLsizeiptr size)
1311{
1312	mResourceManager->checkBufferAllocation(buffer);
1313
1314	Buffer* bufferObject = getBuffer(buffer);
1315	getTransformFeedback()->setBuffer(index, bufferObject, offset, size);
1316}
1317
1318bool Context::bindTransformFeedback(GLuint id)
1319{
1320	if(!getTransformFeedback(id))
1321	{
1322		mTransformFeedbackMap[id] = new TransformFeedback(id);
1323	}
1324
1325	mState.transformFeedback = id;
1326
1327	return true;
1328}
1329
1330bool Context::bindSampler(GLuint unit, GLuint sampler)
1331{
1332	mResourceManager->checkSamplerAllocation(sampler);
1333
1334	Sampler* samplerObject = getSampler(sampler);
1335
1336	if(sampler)
1337	{
1338		mState.sampler[unit] = samplerObject;
1339	}
1340
1341	return !!samplerObject;
1342}
1343
1344void Context::useProgram(GLuint program)
1345{
1346    GLuint priorProgram = mState.currentProgram;
1347    mState.currentProgram = program;               // Must switch before trying to delete, otherwise it only gets flagged.
1348
1349    if(priorProgram != program)
1350    {
1351        Program *newProgram = mResourceManager->getProgram(program);
1352        Program *oldProgram = mResourceManager->getProgram(priorProgram);
1353
1354        if(newProgram)
1355        {
1356            newProgram->addRef();
1357        }
1358
1359        if(oldProgram)
1360        {
1361            oldProgram->release();
1362        }
1363    }
1364}
1365
1366void Context::beginQuery(GLenum target, GLuint query)
1367{
1368    // From EXT_occlusion_query_boolean: If BeginQueryEXT is called with an <id>
1369    // of zero, if the active query object name for <target> is non-zero (for the
1370    // targets ANY_SAMPLES_PASSED_EXT and ANY_SAMPLES_PASSED_CONSERVATIVE_EXT, if
1371    // the active query for either target is non-zero), if <id> is the name of an
1372    // existing query object whose type does not match <target>, or if <id> is the
1373    // active query object name for any query type, the error INVALID_OPERATION is
1374    // generated.
1375
1376    // Ensure no other queries are active
1377    // NOTE: If other queries than occlusion are supported, we will need to check
1378    // separately that:
1379    //    a) The query ID passed is not the current active query for any target/type
1380    //    b) There are no active queries for the requested target (and in the case
1381    //       of GL_ANY_SAMPLES_PASSED_EXT and GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT,
1382    //       no query may be active for either if glBeginQuery targets either.
1383    for(int i = 0; i < QUERY_TYPE_COUNT; i++)
1384    {
1385        if(mState.activeQuery[i] != NULL)
1386        {
1387            return error(GL_INVALID_OPERATION);
1388        }
1389    }
1390
1391    QueryType qType;
1392    switch(target)
1393    {
1394    case GL_ANY_SAMPLES_PASSED_EXT:
1395        qType = QUERY_ANY_SAMPLES_PASSED;
1396        break;
1397    case GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT:
1398        qType = QUERY_ANY_SAMPLES_PASSED_CONSERVATIVE;
1399        break;
1400    case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
1401        qType = QUERY_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN;
1402        break;
1403    default:
1404        ASSERT(false);
1405    }
1406
1407    Query *queryObject = createQuery(query, target);
1408
1409    // Check that name was obtained with glGenQueries
1410    if(!queryObject)
1411    {
1412        return error(GL_INVALID_OPERATION);
1413    }
1414
1415    // Check for type mismatch
1416    if(queryObject->getType() != target)
1417    {
1418        return error(GL_INVALID_OPERATION);
1419    }
1420
1421    // Set query as active for specified target
1422    mState.activeQuery[qType] = queryObject;
1423
1424    // Begin query
1425    queryObject->begin();
1426}
1427
1428void Context::endQuery(GLenum target)
1429{
1430    QueryType qType;
1431
1432    switch(target)
1433    {
1434    case GL_ANY_SAMPLES_PASSED_EXT:                qType = QUERY_ANY_SAMPLES_PASSED;                    break;
1435    case GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT:   qType = QUERY_ANY_SAMPLES_PASSED_CONSERVATIVE;       break;
1436    case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN: qType = QUERY_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN; break;
1437    default: UNREACHABLE(target); return;
1438    }
1439
1440    Query *queryObject = mState.activeQuery[qType];
1441
1442    if(queryObject == NULL)
1443    {
1444        return error(GL_INVALID_OPERATION);
1445    }
1446
1447    queryObject->end();
1448
1449    mState.activeQuery[qType] = NULL;
1450}
1451
1452void Context::setFramebufferZero(Framebuffer *buffer)
1453{
1454    delete mFramebufferMap[0];
1455    mFramebufferMap[0] = buffer;
1456}
1457
1458void Context::setRenderbufferStorage(RenderbufferStorage *renderbuffer)
1459{
1460    Renderbuffer *renderbufferObject = mState.renderbuffer;
1461    renderbufferObject->setStorage(renderbuffer);
1462}
1463
1464Framebuffer *Context::getFramebuffer(unsigned int handle) const
1465{
1466    FramebufferMap::const_iterator framebuffer = mFramebufferMap.find(handle);
1467
1468    if(framebuffer == mFramebufferMap.end())
1469    {
1470        return NULL;
1471    }
1472    else
1473    {
1474        return framebuffer->second;
1475    }
1476}
1477
1478Fence *Context::getFence(unsigned int handle) const
1479{
1480    FenceMap::const_iterator fence = mFenceMap.find(handle);
1481
1482    if(fence == mFenceMap.end())
1483    {
1484        return NULL;
1485    }
1486    else
1487    {
1488        return fence->second;
1489    }
1490}
1491
1492FenceSync *Context::getFenceSync(GLsync handle) const
1493{
1494	return mResourceManager->getFenceSync(static_cast<GLuint>(reinterpret_cast<uintptr_t>(handle)));
1495}
1496
1497Query *Context::getQuery(unsigned int handle) const
1498{
1499	QueryMap::const_iterator query = mQueryMap.find(handle);
1500
1501	if(query == mQueryMap.end())
1502	{
1503		return NULL;
1504	}
1505	else
1506	{
1507		return query->second;
1508	}
1509}
1510
1511Query *Context::createQuery(unsigned int handle, GLenum type)
1512{
1513	QueryMap::iterator query = mQueryMap.find(handle);
1514
1515	if(query == mQueryMap.end())
1516	{
1517		return NULL;
1518	}
1519	else
1520	{
1521		if(!query->second)
1522		{
1523			query->second = new Query(handle, type);
1524			query->second->addRef();
1525		}
1526
1527		return query->second;
1528	}
1529}
1530
1531VertexArray *Context::getVertexArray(GLuint array) const
1532{
1533	VertexArrayMap::const_iterator vertexArray = mVertexArrayMap.find(array);
1534
1535	return (vertexArray == mVertexArrayMap.end()) ? nullptr : vertexArray->second;
1536}
1537
1538VertexArray *Context::getCurrentVertexArray() const
1539{
1540	return getVertexArray(mState.vertexArray);
1541}
1542
1543bool Context::isVertexArray(GLuint array) const
1544{
1545	VertexArrayMap::const_iterator vertexArray = mVertexArrayMap.find(array);
1546
1547	return vertexArray != mVertexArrayMap.end();
1548}
1549
1550bool Context::hasZeroDivisor() const
1551{
1552	// Verify there is at least one active attribute with a divisor of zero
1553	es2::Program *programObject = getCurrentProgram();
1554	for(int attributeIndex = 0; attributeIndex < MAX_VERTEX_ATTRIBS; attributeIndex++)
1555	{
1556		bool active = (programObject->getAttributeStream(attributeIndex) != -1);
1557		if(active && getCurrentVertexArray()->getVertexAttribute(attributeIndex).mDivisor == 0)
1558		{
1559			return true;
1560		}
1561	}
1562
1563	return false;
1564}
1565
1566TransformFeedback *Context::getTransformFeedback(GLuint transformFeedback) const
1567{
1568	TransformFeedbackMap::const_iterator transformFeedbackObject = mTransformFeedbackMap.find(transformFeedback);
1569
1570	return (transformFeedbackObject == mTransformFeedbackMap.end()) ? NULL : transformFeedbackObject->second;
1571}
1572
1573Sampler *Context::getSampler(GLuint sampler) const
1574{
1575	return mResourceManager->getSampler(sampler);
1576}
1577
1578bool Context::isSampler(GLuint sampler) const
1579{
1580	return mResourceManager->isSampler(sampler);
1581}
1582
1583Buffer *Context::getArrayBuffer() const
1584{
1585    return mState.arrayBuffer;
1586}
1587
1588Buffer *Context::getElementArrayBuffer() const
1589{
1590	return getCurrentVertexArray()->getElementArrayBuffer();
1591}
1592
1593Buffer *Context::getCopyReadBuffer() const
1594{
1595	return mState.copyReadBuffer;
1596}
1597
1598Buffer *Context::getCopyWriteBuffer() const
1599{
1600	return mState.copyWriteBuffer;
1601}
1602
1603Buffer *Context::getPixelPackBuffer() const
1604{
1605	return mState.pixelPackBuffer;
1606}
1607
1608Buffer *Context::getPixelUnpackBuffer() const
1609{
1610	return mState.pixelUnpackBuffer;
1611}
1612
1613Buffer *Context::getGenericUniformBuffer() const
1614{
1615	return mState.genericUniformBuffer;
1616}
1617
1618bool Context::getBuffer(GLenum target, es2::Buffer **buffer) const
1619{
1620	switch(target)
1621	{
1622	case GL_ARRAY_BUFFER:
1623		*buffer = getArrayBuffer();
1624		break;
1625	case GL_ELEMENT_ARRAY_BUFFER:
1626		*buffer = getElementArrayBuffer();
1627		break;
1628	case GL_COPY_READ_BUFFER:
1629		if(clientVersion >= 3)
1630		{
1631			*buffer = getCopyReadBuffer();
1632			break;
1633		}
1634		else return false;
1635	case GL_COPY_WRITE_BUFFER:
1636		if(clientVersion >= 3)
1637		{
1638			*buffer = getCopyWriteBuffer();
1639			break;
1640		}
1641		else return false;
1642	case GL_PIXEL_PACK_BUFFER:
1643		if(clientVersion >= 3)
1644		{
1645			*buffer = getPixelPackBuffer();
1646			break;
1647		}
1648		else return false;
1649	case GL_PIXEL_UNPACK_BUFFER:
1650		if(clientVersion >= 3)
1651		{
1652			*buffer = getPixelUnpackBuffer();
1653			break;
1654		}
1655		else return false;
1656	case GL_TRANSFORM_FEEDBACK_BUFFER:
1657		if(clientVersion >= 3)
1658		{
1659			TransformFeedback* transformFeedback = getTransformFeedback();
1660			*buffer = transformFeedback ? static_cast<es2::Buffer*>(transformFeedback->getGenericBuffer()) : nullptr;
1661			break;
1662		}
1663		else return false;
1664	case GL_UNIFORM_BUFFER:
1665		if(clientVersion >= 3)
1666		{
1667			*buffer = getGenericUniformBuffer();
1668			break;
1669		}
1670		else return false;
1671	default:
1672		return false;
1673	}
1674	return true;
1675}
1676
1677TransformFeedback *Context::getTransformFeedback() const
1678{
1679	return getTransformFeedback(mState.transformFeedback);
1680}
1681
1682Program *Context::getCurrentProgram() const
1683{
1684    return mResourceManager->getProgram(mState.currentProgram);
1685}
1686
1687Texture2D *Context::getTexture2D() const
1688{
1689	return static_cast<Texture2D*>(getSamplerTexture(mState.activeSampler, TEXTURE_2D));
1690}
1691
1692Texture3D *Context::getTexture3D() const
1693{
1694	return static_cast<Texture3D*>(getSamplerTexture(mState.activeSampler, TEXTURE_3D));
1695}
1696
1697Texture2DArray *Context::getTexture2DArray() const
1698{
1699	return static_cast<Texture2DArray*>(getSamplerTexture(mState.activeSampler, TEXTURE_2D_ARRAY));
1700}
1701
1702TextureCubeMap *Context::getTextureCubeMap() const
1703{
1704    return static_cast<TextureCubeMap*>(getSamplerTexture(mState.activeSampler, TEXTURE_CUBE));
1705}
1706
1707TextureExternal *Context::getTextureExternal() const
1708{
1709    return static_cast<TextureExternal*>(getSamplerTexture(mState.activeSampler, TEXTURE_EXTERNAL));
1710}
1711
1712Texture *Context::getSamplerTexture(unsigned int sampler, TextureType type) const
1713{
1714    GLuint texid = mState.samplerTexture[type][sampler].name();
1715
1716    if(texid == 0)   // Special case: 0 refers to different initial textures based on the target
1717    {
1718        switch (type)
1719        {
1720        case TEXTURE_2D: return mTexture2DZero;
1721		case TEXTURE_3D: return mTexture3DZero;
1722		case TEXTURE_2D_ARRAY: return mTexture2DArrayZero;
1723        case TEXTURE_CUBE: return mTextureCubeMapZero;
1724        case TEXTURE_EXTERNAL: return mTextureExternalZero;
1725        default: UNREACHABLE(type);
1726        }
1727    }
1728
1729    return mState.samplerTexture[type][sampler];
1730}
1731
1732void Context::samplerParameteri(GLuint sampler, GLenum pname, GLint param)
1733{
1734	mResourceManager->checkSamplerAllocation(sampler);
1735
1736	Sampler *samplerObject = getSampler(sampler);
1737	ASSERT(samplerObject);
1738
1739	switch(pname)
1740	{
1741	case GL_TEXTURE_MIN_FILTER:    samplerObject->setMinFilter(static_cast<GLenum>(param));       break;
1742	case GL_TEXTURE_MAG_FILTER:    samplerObject->setMagFilter(static_cast<GLenum>(param));       break;
1743	case GL_TEXTURE_WRAP_S:        samplerObject->setWrapS(static_cast<GLenum>(param));           break;
1744	case GL_TEXTURE_WRAP_T:        samplerObject->setWrapT(static_cast<GLenum>(param));           break;
1745	case GL_TEXTURE_WRAP_R:        samplerObject->setWrapR(static_cast<GLenum>(param));           break;
1746	case GL_TEXTURE_MIN_LOD:       samplerObject->setMinLod(static_cast<GLfloat>(param));         break;
1747	case GL_TEXTURE_MAX_LOD:       samplerObject->setMaxLod(static_cast<GLfloat>(param));         break;
1748	case GL_TEXTURE_COMPARE_MODE:  samplerObject->setComparisonMode(static_cast<GLenum>(param));  break;
1749	case GL_TEXTURE_COMPARE_FUNC:  samplerObject->setComparisonFunc(static_cast<GLenum>(param));  break;
1750	default:                       UNREACHABLE(pname); break;
1751	}
1752}
1753
1754void Context::samplerParameterf(GLuint sampler, GLenum pname, GLfloat param)
1755{
1756	mResourceManager->checkSamplerAllocation(sampler);
1757
1758	Sampler *samplerObject = getSampler(sampler);
1759	ASSERT(samplerObject);
1760
1761	switch(pname)
1762	{
1763	case GL_TEXTURE_MIN_FILTER:    samplerObject->setMinFilter(static_cast<GLenum>(roundf(param)));       break;
1764	case GL_TEXTURE_MAG_FILTER:    samplerObject->setMagFilter(static_cast<GLenum>(roundf(param)));       break;
1765	case GL_TEXTURE_WRAP_S:        samplerObject->setWrapS(static_cast<GLenum>(roundf(param)));           break;
1766	case GL_TEXTURE_WRAP_T:        samplerObject->setWrapT(static_cast<GLenum>(roundf(param)));           break;
1767	case GL_TEXTURE_WRAP_R:        samplerObject->setWrapR(static_cast<GLenum>(roundf(param)));           break;
1768	case GL_TEXTURE_MIN_LOD:       samplerObject->setMinLod(param);                                       break;
1769	case GL_TEXTURE_MAX_LOD:       samplerObject->setMaxLod(param);                                       break;
1770	case GL_TEXTURE_COMPARE_MODE:  samplerObject->setComparisonMode(static_cast<GLenum>(roundf(param)));  break;
1771	case GL_TEXTURE_COMPARE_FUNC:  samplerObject->setComparisonFunc(static_cast<GLenum>(roundf(param)));  break;
1772	default:                       UNREACHABLE(pname); break;
1773	}
1774}
1775
1776GLint Context::getSamplerParameteri(GLuint sampler, GLenum pname)
1777{
1778	mResourceManager->checkSamplerAllocation(sampler);
1779
1780	Sampler *samplerObject = getSampler(sampler);
1781	ASSERT(samplerObject);
1782
1783	switch(pname)
1784	{
1785	case GL_TEXTURE_MIN_FILTER:    return static_cast<GLint>(samplerObject->getMinFilter());
1786	case GL_TEXTURE_MAG_FILTER:    return static_cast<GLint>(samplerObject->getMagFilter());
1787	case GL_TEXTURE_WRAP_S:        return static_cast<GLint>(samplerObject->getWrapS());
1788	case GL_TEXTURE_WRAP_T:        return static_cast<GLint>(samplerObject->getWrapT());
1789	case GL_TEXTURE_WRAP_R:        return static_cast<GLint>(samplerObject->getWrapR());
1790	case GL_TEXTURE_MIN_LOD:       return static_cast<GLint>(roundf(samplerObject->getMinLod()));
1791	case GL_TEXTURE_MAX_LOD:       return static_cast<GLint>(roundf(samplerObject->getMaxLod()));
1792	case GL_TEXTURE_COMPARE_MODE:  return static_cast<GLint>(samplerObject->getComparisonMode());
1793	case GL_TEXTURE_COMPARE_FUNC:  return static_cast<GLint>(samplerObject->getComparisonFunc());
1794	default:                       UNREACHABLE(pname); return 0;
1795	}
1796}
1797
1798GLfloat Context::getSamplerParameterf(GLuint sampler, GLenum pname)
1799{
1800	mResourceManager->checkSamplerAllocation(sampler);
1801
1802	Sampler *samplerObject = getSampler(sampler);
1803	ASSERT(samplerObject);
1804
1805	switch(pname)
1806	{
1807	case GL_TEXTURE_MIN_FILTER:    return static_cast<GLfloat>(samplerObject->getMinFilter());
1808	case GL_TEXTURE_MAG_FILTER:    return static_cast<GLfloat>(samplerObject->getMagFilter());
1809	case GL_TEXTURE_WRAP_S:        return static_cast<GLfloat>(samplerObject->getWrapS());
1810	case GL_TEXTURE_WRAP_T:        return static_cast<GLfloat>(samplerObject->getWrapT());
1811	case GL_TEXTURE_WRAP_R:        return static_cast<GLfloat>(samplerObject->getWrapR());
1812	case GL_TEXTURE_MIN_LOD:       return samplerObject->getMinLod();
1813	case GL_TEXTURE_MAX_LOD:       return samplerObject->getMaxLod();
1814	case GL_TEXTURE_COMPARE_MODE:  return static_cast<GLfloat>(samplerObject->getComparisonMode());
1815	case GL_TEXTURE_COMPARE_FUNC:  return static_cast<GLfloat>(samplerObject->getComparisonFunc());
1816	default:                       UNREACHABLE(pname); return 0;
1817	}
1818}
1819
1820bool Context::getBooleanv(GLenum pname, GLboolean *params) const
1821{
1822    switch(pname)
1823    {
1824    case GL_SHADER_COMPILER:          *params = GL_TRUE;                          break;
1825    case GL_SAMPLE_COVERAGE_INVERT:   *params = mState.sampleCoverageInvert;      break;
1826    case GL_DEPTH_WRITEMASK:          *params = mState.depthMask;                 break;
1827    case GL_COLOR_WRITEMASK:
1828        params[0] = mState.colorMaskRed;
1829        params[1] = mState.colorMaskGreen;
1830        params[2] = mState.colorMaskBlue;
1831        params[3] = mState.colorMaskAlpha;
1832        break;
1833    case GL_CULL_FACE:                *params = mState.cullFaceEnabled;                  break;
1834    case GL_POLYGON_OFFSET_FILL:      *params = mState.polygonOffsetFillEnabled;         break;
1835    case GL_SAMPLE_ALPHA_TO_COVERAGE: *params = mState.sampleAlphaToCoverageEnabled;     break;
1836    case GL_SAMPLE_COVERAGE:          *params = mState.sampleCoverageEnabled;            break;
1837    case GL_SCISSOR_TEST:             *params = mState.scissorTestEnabled;               break;
1838    case GL_STENCIL_TEST:             *params = mState.stencilTestEnabled;               break;
1839    case GL_DEPTH_TEST:               *params = mState.depthTestEnabled;                 break;
1840    case GL_BLEND:                    *params = mState.blendEnabled;                     break;
1841    case GL_DITHER:                   *params = mState.ditherEnabled;                    break;
1842    case GL_PRIMITIVE_RESTART_FIXED_INDEX: *params = mState.primitiveRestartFixedIndexEnabled; break;
1843    case GL_RASTERIZER_DISCARD:       *params = mState.rasterizerDiscardEnabled;         break;
1844	case GL_TRANSFORM_FEEDBACK_ACTIVE:
1845		{
1846			TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
1847			if(transformFeedback)
1848			{
1849				*params = transformFeedback->isActive();
1850				break;
1851			}
1852			else return false;
1853		}
1854     case GL_TRANSFORM_FEEDBACK_PAUSED:
1855		{
1856			TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
1857			if(transformFeedback)
1858			{
1859				*params = transformFeedback->isPaused();
1860				break;
1861			}
1862			else return false;
1863		}
1864    default:
1865        return false;
1866    }
1867
1868    return true;
1869}
1870
1871bool Context::getFloatv(GLenum pname, GLfloat *params) const
1872{
1873    // Please note: DEPTH_CLEAR_VALUE is included in our internal getFloatv implementation
1874    // because it is stored as a float, despite the fact that the GL ES 2.0 spec names
1875    // GetIntegerv as its native query function. As it would require conversion in any
1876    // case, this should make no difference to the calling application.
1877    switch(pname)
1878    {
1879    case GL_LINE_WIDTH:               *params = mState.lineWidth;            break;
1880    case GL_SAMPLE_COVERAGE_VALUE:    *params = mState.sampleCoverageValue;  break;
1881    case GL_DEPTH_CLEAR_VALUE:        *params = mState.depthClearValue;      break;
1882    case GL_POLYGON_OFFSET_FACTOR:    *params = mState.polygonOffsetFactor;  break;
1883    case GL_POLYGON_OFFSET_UNITS:     *params = mState.polygonOffsetUnits;   break;
1884    case GL_ALIASED_LINE_WIDTH_RANGE:
1885        params[0] = ALIASED_LINE_WIDTH_RANGE_MIN;
1886        params[1] = ALIASED_LINE_WIDTH_RANGE_MAX;
1887        break;
1888    case GL_ALIASED_POINT_SIZE_RANGE:
1889        params[0] = ALIASED_POINT_SIZE_RANGE_MIN;
1890        params[1] = ALIASED_POINT_SIZE_RANGE_MAX;
1891        break;
1892    case GL_DEPTH_RANGE:
1893        params[0] = mState.zNear;
1894        params[1] = mState.zFar;
1895        break;
1896    case GL_COLOR_CLEAR_VALUE:
1897        params[0] = mState.colorClearValue.red;
1898        params[1] = mState.colorClearValue.green;
1899        params[2] = mState.colorClearValue.blue;
1900        params[3] = mState.colorClearValue.alpha;
1901        break;
1902    case GL_BLEND_COLOR:
1903        params[0] = mState.blendColor.red;
1904        params[1] = mState.blendColor.green;
1905        params[2] = mState.blendColor.blue;
1906        params[3] = mState.blendColor.alpha;
1907        break;
1908	case GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT:
1909        *params = MAX_TEXTURE_MAX_ANISOTROPY;
1910		break;
1911    default:
1912        return false;
1913    }
1914
1915    return true;
1916}
1917
1918template bool Context::getIntegerv<GLint>(GLenum pname, GLint *params) const;
1919template bool Context::getIntegerv<GLint64>(GLenum pname, GLint64 *params) const;
1920
1921template<typename T> bool Context::getIntegerv(GLenum pname, T *params) const
1922{
1923    // Please note: DEPTH_CLEAR_VALUE is not included in our internal getIntegerv implementation
1924    // because it is stored as a float, despite the fact that the GL ES 2.0 spec names
1925    // GetIntegerv as its native query function. As it would require conversion in any
1926    // case, this should make no difference to the calling application. You may find it in
1927    // Context::getFloatv.
1928    switch(pname)
1929    {
1930    case GL_MAX_VERTEX_ATTRIBS:               *params = MAX_VERTEX_ATTRIBS;               break;
1931    case GL_MAX_VERTEX_UNIFORM_VECTORS:       *params = MAX_VERTEX_UNIFORM_VECTORS;       break;
1932    case GL_MAX_VARYING_VECTORS:              *params = MAX_VARYING_VECTORS;              break;
1933    case GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS: *params = MAX_COMBINED_TEXTURE_IMAGE_UNITS; break;
1934    case GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:   *params = MAX_VERTEX_TEXTURE_IMAGE_UNITS;   break;
1935    case GL_MAX_TEXTURE_IMAGE_UNITS:          *params = MAX_TEXTURE_IMAGE_UNITS;          break;
1936	case GL_MAX_FRAGMENT_UNIFORM_VECTORS:     *params = MAX_FRAGMENT_UNIFORM_VECTORS;     break;
1937	case GL_MAX_RENDERBUFFER_SIZE:            *params = IMPLEMENTATION_MAX_RENDERBUFFER_SIZE; break;
1938    case GL_NUM_SHADER_BINARY_FORMATS:        *params = 0;                                    break;
1939    case GL_SHADER_BINARY_FORMATS:      /* no shader binary formats are supported */          break;
1940    case GL_ARRAY_BUFFER_BINDING:             *params = getArrayBufferName();                 break;
1941    case GL_ELEMENT_ARRAY_BUFFER_BINDING:     *params = getElementArrayBufferName();          break;
1942//	case GL_FRAMEBUFFER_BINDING:            // now equivalent to GL_DRAW_FRAMEBUFFER_BINDING_ANGLE
1943    case GL_DRAW_FRAMEBUFFER_BINDING_ANGLE:   *params = mState.drawFramebuffer;               break;
1944    case GL_READ_FRAMEBUFFER_BINDING_ANGLE:   *params = mState.readFramebuffer;               break;
1945    case GL_RENDERBUFFER_BINDING:             *params = mState.renderbuffer.name();           break;
1946    case GL_CURRENT_PROGRAM:                  *params = mState.currentProgram;                break;
1947    case GL_PACK_ALIGNMENT:                   *params = mState.packAlignment;                 break;
1948    case GL_UNPACK_ALIGNMENT:                 *params = mState.unpackInfo.alignment;          break;
1949    case GL_GENERATE_MIPMAP_HINT:             *params = mState.generateMipmapHint;            break;
1950    case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES: *params = mState.fragmentShaderDerivativeHint; break;
1951    case GL_ACTIVE_TEXTURE:                   *params = (mState.activeSampler + GL_TEXTURE0); break;
1952    case GL_STENCIL_FUNC:                     *params = mState.stencilFunc;                   break;
1953    case GL_STENCIL_REF:                      *params = mState.stencilRef;                    break;
1954	case GL_STENCIL_VALUE_MASK:               *params = sw::clampToSignedInt(mState.stencilMask); break;
1955    case GL_STENCIL_BACK_FUNC:                *params = mState.stencilBackFunc;               break;
1956    case GL_STENCIL_BACK_REF:                 *params = mState.stencilBackRef;                break;
1957	case GL_STENCIL_BACK_VALUE_MASK:          *params = sw::clampToSignedInt(mState.stencilBackMask); break;
1958    case GL_STENCIL_FAIL:                     *params = mState.stencilFail;                   break;
1959    case GL_STENCIL_PASS_DEPTH_FAIL:          *params = mState.stencilPassDepthFail;          break;
1960    case GL_STENCIL_PASS_DEPTH_PASS:          *params = mState.stencilPassDepthPass;          break;
1961    case GL_STENCIL_BACK_FAIL:                *params = mState.stencilBackFail;               break;
1962    case GL_STENCIL_BACK_PASS_DEPTH_FAIL:     *params = mState.stencilBackPassDepthFail;      break;
1963    case GL_STENCIL_BACK_PASS_DEPTH_PASS:     *params = mState.stencilBackPassDepthPass;      break;
1964    case GL_DEPTH_FUNC:                       *params = mState.depthFunc;                     break;
1965    case GL_BLEND_SRC_RGB:                    *params = mState.sourceBlendRGB;                break;
1966    case GL_BLEND_SRC_ALPHA:                  *params = mState.sourceBlendAlpha;              break;
1967    case GL_BLEND_DST_RGB:                    *params = mState.destBlendRGB;                  break;
1968    case GL_BLEND_DST_ALPHA:                  *params = mState.destBlendAlpha;                break;
1969    case GL_BLEND_EQUATION_RGB:               *params = mState.blendEquationRGB;              break;
1970    case GL_BLEND_EQUATION_ALPHA:             *params = mState.blendEquationAlpha;            break;
1971	case GL_STENCIL_WRITEMASK:                *params = sw::clampToSignedInt(mState.stencilWritemask); break;
1972	case GL_STENCIL_BACK_WRITEMASK:           *params = sw::clampToSignedInt(mState.stencilBackWritemask); break;
1973    case GL_STENCIL_CLEAR_VALUE:              *params = mState.stencilClearValue;             break;
1974    case GL_SUBPIXEL_BITS:                    *params = 4;                                    break;
1975	case GL_MAX_TEXTURE_SIZE:                 *params = IMPLEMENTATION_MAX_TEXTURE_SIZE;          break;
1976	case GL_MAX_CUBE_MAP_TEXTURE_SIZE:        *params = IMPLEMENTATION_MAX_CUBE_MAP_TEXTURE_SIZE; break;
1977    case GL_NUM_COMPRESSED_TEXTURE_FORMATS:   *params = NUM_COMPRESSED_TEXTURE_FORMATS;           break;
1978	case GL_MAX_SAMPLES_ANGLE:                *params = IMPLEMENTATION_MAX_SAMPLES;               break;
1979    case GL_SAMPLE_BUFFERS:
1980    case GL_SAMPLES:
1981        {
1982            Framebuffer *framebuffer = getDrawFramebuffer();
1983			int width, height, samples;
1984
1985            if(framebuffer->completeness(width, height, samples) == GL_FRAMEBUFFER_COMPLETE)
1986            {
1987                switch(pname)
1988                {
1989                case GL_SAMPLE_BUFFERS:
1990                    if(samples > 1)
1991                    {
1992                        *params = 1;
1993                    }
1994                    else
1995                    {
1996                        *params = 0;
1997                    }
1998                    break;
1999                case GL_SAMPLES:
2000                    *params = samples;
2001                    break;
2002                }
2003            }
2004            else
2005            {
2006                *params = 0;
2007            }
2008        }
2009        break;
2010    case GL_IMPLEMENTATION_COLOR_READ_TYPE:
2011		{
2012			Framebuffer *framebuffer = getReadFramebuffer();
2013			*params = framebuffer->getImplementationColorReadType();
2014		}
2015		break;
2016    case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
2017		{
2018			Framebuffer *framebuffer = getReadFramebuffer();
2019			*params = framebuffer->getImplementationColorReadFormat();
2020		}
2021		break;
2022    case GL_MAX_VIEWPORT_DIMS:
2023        {
2024			int maxDimension = IMPLEMENTATION_MAX_RENDERBUFFER_SIZE;
2025            params[0] = maxDimension;
2026            params[1] = maxDimension;
2027        }
2028        break;
2029    case GL_COMPRESSED_TEXTURE_FORMATS:
2030        {
2031			for(int i = 0; i < NUM_COMPRESSED_TEXTURE_FORMATS; i++)
2032            {
2033                params[i] = compressedTextureFormats[i];
2034            }
2035        }
2036        break;
2037    case GL_VIEWPORT:
2038        params[0] = mState.viewportX;
2039        params[1] = mState.viewportY;
2040        params[2] = mState.viewportWidth;
2041        params[3] = mState.viewportHeight;
2042        break;
2043    case GL_SCISSOR_BOX:
2044        params[0] = mState.scissorX;
2045        params[1] = mState.scissorY;
2046        params[2] = mState.scissorWidth;
2047        params[3] = mState.scissorHeight;
2048        break;
2049    case GL_CULL_FACE_MODE:                   *params = mState.cullMode;                 break;
2050    case GL_FRONT_FACE:                       *params = mState.frontFace;                break;
2051    case GL_RED_BITS:
2052    case GL_GREEN_BITS:
2053    case GL_BLUE_BITS:
2054    case GL_ALPHA_BITS:
2055        {
2056            Framebuffer *framebuffer = getDrawFramebuffer();
2057            Renderbuffer *colorbuffer = framebuffer->getColorbuffer(0);
2058
2059            if(colorbuffer)
2060            {
2061                switch (pname)
2062                {
2063                  case GL_RED_BITS:   *params = colorbuffer->getRedSize();   break;
2064                  case GL_GREEN_BITS: *params = colorbuffer->getGreenSize(); break;
2065                  case GL_BLUE_BITS:  *params = colorbuffer->getBlueSize();  break;
2066                  case GL_ALPHA_BITS: *params = colorbuffer->getAlphaSize(); break;
2067                }
2068            }
2069            else
2070            {
2071                *params = 0;
2072            }
2073        }
2074        break;
2075    case GL_DEPTH_BITS:
2076        {
2077            Framebuffer *framebuffer = getDrawFramebuffer();
2078            Renderbuffer *depthbuffer = framebuffer->getDepthbuffer();
2079
2080            if(depthbuffer)
2081            {
2082                *params = depthbuffer->getDepthSize();
2083            }
2084            else
2085            {
2086                *params = 0;
2087            }
2088        }
2089        break;
2090    case GL_STENCIL_BITS:
2091        {
2092            Framebuffer *framebuffer = getDrawFramebuffer();
2093            Renderbuffer *stencilbuffer = framebuffer->getStencilbuffer();
2094
2095            if(stencilbuffer)
2096            {
2097                *params = stencilbuffer->getStencilSize();
2098            }
2099            else
2100            {
2101                *params = 0;
2102            }
2103        }
2104        break;
2105	case GL_TEXTURE_BINDING_2D:
2106		if(mState.activeSampler > MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
2107		{
2108			error(GL_INVALID_OPERATION);
2109			return false;
2110		}
2111
2112		*params = mState.samplerTexture[TEXTURE_2D][mState.activeSampler].name();
2113		break;
2114	case GL_TEXTURE_BINDING_CUBE_MAP:
2115		if(mState.activeSampler > MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
2116		{
2117			error(GL_INVALID_OPERATION);
2118			return false;
2119		}
2120
2121		*params = mState.samplerTexture[TEXTURE_CUBE][mState.activeSampler].name();
2122		break;
2123	case GL_TEXTURE_BINDING_EXTERNAL_OES:
2124		if(mState.activeSampler > MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
2125		{
2126			error(GL_INVALID_OPERATION);
2127			return false;
2128		}
2129
2130		*params = mState.samplerTexture[TEXTURE_EXTERNAL][mState.activeSampler].name();
2131		break;
2132	case GL_TEXTURE_BINDING_3D_OES:
2133		if(mState.activeSampler > MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
2134		{
2135			error(GL_INVALID_OPERATION);
2136			return false;
2137		}
2138
2139		*params = mState.samplerTexture[TEXTURE_3D][mState.activeSampler].name();
2140		break;
2141	case GL_TEXTURE_BINDING_2D_ARRAY: // GLES 3.0
2142		if(clientVersion < 3)
2143		{
2144			return false;
2145		}
2146		else if(mState.activeSampler > MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
2147		{
2148			error(GL_INVALID_OPERATION);
2149			return false;
2150		}
2151
2152		*params = mState.samplerTexture[TEXTURE_2D_ARRAY][mState.activeSampler].name();
2153		break;
2154	case GL_COPY_READ_BUFFER_BINDING: // name, initially 0
2155		if(clientVersion >= 3)
2156		{
2157			*params = mState.copyReadBuffer.name();
2158		}
2159		else
2160		{
2161			return false;
2162		}
2163		break;
2164	case GL_COPY_WRITE_BUFFER_BINDING: // name, initially 0
2165		if(clientVersion >= 3)
2166		{
2167			*params = mState.copyWriteBuffer.name();
2168		}
2169		else
2170		{
2171			return false;
2172		}
2173		break;
2174	case GL_DRAW_BUFFER0: // symbolic constant, initial value is GL_BACK​
2175	case GL_DRAW_BUFFER1: // symbolic constant, initial value is GL_NONE
2176	case GL_DRAW_BUFFER2:
2177	case GL_DRAW_BUFFER3:
2178	case GL_DRAW_BUFFER4:
2179	case GL_DRAW_BUFFER5:
2180	case GL_DRAW_BUFFER6:
2181	case GL_DRAW_BUFFER7:
2182	case GL_DRAW_BUFFER8:
2183	case GL_DRAW_BUFFER9:
2184	case GL_DRAW_BUFFER10:
2185	case GL_DRAW_BUFFER11:
2186	case GL_DRAW_BUFFER12:
2187	case GL_DRAW_BUFFER13:
2188	case GL_DRAW_BUFFER14:
2189	case GL_DRAW_BUFFER15:
2190		*params = getDrawFramebuffer()->getDrawBuffer(pname - GL_DRAW_BUFFER0);
2191		break;
2192	case GL_MAJOR_VERSION: // integer, at least 3
2193		if(clientVersion >= 3)
2194		{
2195			*params = clientVersion;
2196		}
2197		else
2198		{
2199			return false;
2200		}
2201		break;
2202	case GL_MAX_3D_TEXTURE_SIZE: // GLint, at least 2048
2203		*params = IMPLEMENTATION_MAX_TEXTURE_SIZE;
2204		break;
2205	case GL_MAX_ARRAY_TEXTURE_LAYERS: // GLint, at least 2048
2206		*params = IMPLEMENTATION_MAX_TEXTURE_SIZE;
2207		break;
2208	case GL_MAX_COLOR_ATTACHMENTS: // integer, at least 8
2209		UNIMPLEMENTED();
2210		*params = IMPLEMENTATION_MAX_COLOR_ATTACHMENTS;
2211		break;
2212	case GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS: // integer, at least 50048
2213		*params = MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS;
2214		break;
2215	case GL_MAX_COMBINED_UNIFORM_BLOCKS: // integer, at least 70
2216		UNIMPLEMENTED();
2217		*params = 70;
2218		break;
2219	case GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS: // integer, at least 50176
2220		*params = MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS;
2221		break;
2222	case GL_MAX_DRAW_BUFFERS: // integer, at least 8
2223		UNIMPLEMENTED();
2224		*params = IMPLEMENTATION_MAX_DRAW_BUFFERS;
2225		break;
2226	case GL_MAX_ELEMENT_INDEX:
2227		*params = MAX_ELEMENT_INDEX;
2228		break;
2229	case GL_MAX_ELEMENTS_INDICES:
2230		*params = MAX_ELEMENTS_INDICES;
2231		break;
2232	case GL_MAX_ELEMENTS_VERTICES:
2233		*params = MAX_ELEMENTS_VERTICES;
2234		break;
2235	case GL_MAX_FRAGMENT_INPUT_COMPONENTS: // integer, at least 128
2236		UNIMPLEMENTED();
2237		*params = 128;
2238		break;
2239	case GL_MAX_FRAGMENT_UNIFORM_BLOCKS: // integer, at least 12
2240		*params = MAX_FRAGMENT_UNIFORM_BLOCKS;
2241		break;
2242	case GL_MAX_FRAGMENT_UNIFORM_COMPONENTS: // integer, at least 896
2243		*params = MAX_FRAGMENT_UNIFORM_COMPONENTS;
2244		break;
2245	case GL_MAX_PROGRAM_TEXEL_OFFSET: // integer, minimum is 7
2246		UNIMPLEMENTED();
2247		*params = 7;
2248		break;
2249	case GL_MAX_SERVER_WAIT_TIMEOUT: // integer
2250		UNIMPLEMENTED();
2251		*params = 0;
2252		break;
2253	case GL_MAX_TEXTURE_LOD_BIAS: // integer,  at least 2.0
2254		UNIMPLEMENTED();
2255		*params = 2;
2256		break;
2257	case GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS: // integer, at least 64
2258		UNIMPLEMENTED();
2259		*params = 64;
2260		break;
2261	case GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS: // integer, at least 4
2262		UNIMPLEMENTED();
2263		*params = IMPLEMENTATION_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS;
2264		break;
2265	case GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS: // integer, at least 4
2266		UNIMPLEMENTED();
2267		*params = 4;
2268		break;
2269	case GL_MAX_UNIFORM_BLOCK_SIZE: // integer, at least 16384
2270		*params = MAX_UNIFORM_BLOCK_SIZE;
2271		break;
2272	case GL_MAX_UNIFORM_BUFFER_BINDINGS: // integer, at least 24
2273		*params = IMPLEMENTATION_MAX_UNIFORM_BUFFER_BINDINGS;
2274		break;
2275	case GL_MAX_VARYING_COMPONENTS: // integer, at least 60
2276		UNIMPLEMENTED();
2277		*params = 60;
2278		break;
2279	case GL_MAX_VERTEX_OUTPUT_COMPONENTS: // integer,  at least 64
2280		UNIMPLEMENTED();
2281		*params = 64;
2282		break;
2283	case GL_MAX_VERTEX_UNIFORM_BLOCKS: // integer,  at least 12
2284		*params = MAX_VERTEX_UNIFORM_BLOCKS;
2285		break;
2286	case GL_MAX_VERTEX_UNIFORM_COMPONENTS: // integer,  at least 1024
2287		*params = MAX_VERTEX_UNIFORM_COMPONENTS;
2288		break;
2289	case GL_MIN_PROGRAM_TEXEL_OFFSET: // integer, maximum is -8
2290		UNIMPLEMENTED();
2291		*params = -8;
2292		break;
2293	case GL_MINOR_VERSION: // integer
2294		UNIMPLEMENTED();
2295		*params = 0;
2296		break;
2297	case GL_NUM_EXTENSIONS: // integer
2298		GLuint numExtensions;
2299		getExtensions(0, &numExtensions);
2300		*params = numExtensions;
2301		break;
2302	case GL_NUM_PROGRAM_BINARY_FORMATS: // integer, at least 0
2303		UNIMPLEMENTED();
2304		*params = 0;
2305		break;
2306	case GL_PACK_ROW_LENGTH: // integer, initially 0
2307		*params = mState.packRowLength;
2308		break;
2309	case GL_PACK_SKIP_PIXELS: // integer, initially 0
2310		*params = mState.packSkipPixels;
2311		break;
2312	case GL_PACK_SKIP_ROWS: // integer, initially 0
2313		*params = mState.packSkipRows;
2314		break;
2315	case GL_PIXEL_PACK_BUFFER_BINDING: // integer, initially 0
2316		if(clientVersion >= 3)
2317		{
2318			*params = mState.pixelPackBuffer.name();
2319		}
2320		else
2321		{
2322			return false;
2323		}
2324		break;
2325	case GL_PIXEL_UNPACK_BUFFER_BINDING: // integer, initially 0
2326		if(clientVersion >= 3)
2327		{
2328			*params = mState.pixelUnpackBuffer.name();
2329		}
2330		else
2331		{
2332			return false;
2333		}
2334		break;
2335	case GL_PROGRAM_BINARY_FORMATS: // integer[GL_NUM_PROGRAM_BINARY_FORMATS​]
2336		UNIMPLEMENTED();
2337		*params = 0;
2338		break;
2339	case GL_READ_BUFFER: // symbolic constant,  initial value is GL_BACK​
2340		*params = getReadFramebuffer()->getReadBuffer();
2341		break;
2342	case GL_SAMPLER_BINDING: // GLint, default 0
2343		*params = mState.sampler[mState.activeSampler].name();
2344		break;
2345	case GL_UNIFORM_BUFFER_BINDING: // name, initially 0
2346		if(clientVersion >= 3)
2347		{
2348			*params = mState.genericUniformBuffer.name();
2349		}
2350		else
2351		{
2352			return false;
2353		}
2354		break;
2355	case GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT: // integer, defaults to 1
2356		*params = IMPLEMENTATION_UNIFORM_BUFFER_OFFSET_ALIGNMENT;
2357		break;
2358	case GL_UNIFORM_BUFFER_SIZE: // indexed[n] 64-bit integer, initially 0
2359		if(clientVersion >= 3)
2360		{
2361			*params = mState.genericUniformBuffer->size();
2362		}
2363		else
2364		{
2365			return false;
2366		}
2367		break;
2368	case GL_UNIFORM_BUFFER_START: // indexed[n] 64-bit integer, initially 0
2369		if(clientVersion >= 3)
2370		{
2371			*params = mState.genericUniformBuffer->offset();
2372		}
2373		else
2374		{
2375			return false;
2376		}
2377		*params = 0;
2378		break;
2379	case GL_UNPACK_IMAGE_HEIGHT: // integer, initially 0
2380		*params = mState.unpackInfo.imageHeight;
2381		break;
2382	case GL_UNPACK_ROW_LENGTH: // integer, initially 0
2383		*params = mState.unpackInfo.rowLength;
2384		break;
2385	case GL_UNPACK_SKIP_IMAGES: // integer, initially 0
2386		*params = mState.unpackInfo.skipImages;
2387		break;
2388	case GL_UNPACK_SKIP_PIXELS: // integer, initially 0
2389		*params = mState.unpackInfo.skipPixels;
2390		break;
2391	case GL_UNPACK_SKIP_ROWS: // integer, initially 0
2392		*params = mState.unpackInfo.skipRows;
2393		break;
2394	case GL_VERTEX_ARRAY_BINDING: // GLint, initially 0
2395		*params = getCurrentVertexArray()->name;
2396		break;
2397	case GL_TRANSFORM_FEEDBACK_BINDING:
2398		{
2399			TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
2400			if(transformFeedback)
2401			{
2402				*params = transformFeedback->name;
2403			}
2404			else
2405			{
2406				return false;
2407			}
2408		}
2409		break;
2410	case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING:
2411		{
2412			TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
2413			if(transformFeedback)
2414			{
2415				*params = transformFeedback->getGenericBufferName();
2416			}
2417			else
2418			{
2419				return false;
2420			}
2421		}
2422		break;
2423	default:
2424        return false;
2425    }
2426
2427    return true;
2428}
2429
2430template bool Context::getTransformFeedbackiv<GLint>(GLuint index, GLenum pname, GLint *param) const;
2431template bool Context::getTransformFeedbackiv<GLint64>(GLuint index, GLenum pname, GLint64 *param) const;
2432
2433template<typename T> bool Context::getTransformFeedbackiv(GLuint index, GLenum pname, T *param) const
2434{
2435	TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
2436	if(!transformFeedback)
2437	{
2438		return false;
2439	}
2440
2441	switch(pname)
2442	{
2443	case GL_TRANSFORM_FEEDBACK_BINDING: // GLint, initially 0
2444		*param = transformFeedback->name;
2445		break;
2446	case GL_TRANSFORM_FEEDBACK_ACTIVE: // boolean, initially GL_FALSE
2447		*param = transformFeedback->isActive();
2448		break;
2449	case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING: // name, initially 0
2450		*param = transformFeedback->getBufferName(index);
2451		break;
2452	case GL_TRANSFORM_FEEDBACK_PAUSED: // boolean, initially GL_FALSE
2453		*param = transformFeedback->isPaused();
2454		break;
2455	case GL_TRANSFORM_FEEDBACK_BUFFER_SIZE: // indexed[n] 64-bit integer, initially 0
2456		if(transformFeedback->getBuffer(index))
2457		{
2458			*param = transformFeedback->getSize(index);
2459			break;
2460		}
2461		else return false;
2462	case GL_TRANSFORM_FEEDBACK_BUFFER_START: // indexed[n] 64-bit integer, initially 0
2463		if(transformFeedback->getBuffer(index))
2464		{
2465			*param = transformFeedback->getOffset(index);
2466		break;
2467		}
2468		else return false;
2469	default:
2470		return false;
2471	}
2472
2473	return true;
2474}
2475
2476template bool Context::getUniformBufferiv<GLint>(GLuint index, GLenum pname, GLint *param) const;
2477template bool Context::getUniformBufferiv<GLint64>(GLuint index, GLenum pname, GLint64 *param) const;
2478
2479template<typename T> bool Context::getUniformBufferiv(GLuint index, GLenum pname, T *param) const
2480{
2481	const UniformBufferBinding& uniformBuffer = mState.uniformBuffers[index];
2482
2483	switch(pname)
2484	{
2485	case GL_UNIFORM_BUFFER_BINDING: // name, initially 0
2486		*param = uniformBuffer.get().name();
2487		break;
2488	case GL_UNIFORM_BUFFER_SIZE: // indexed[n] 64-bit integer, initially 0
2489		*param = uniformBuffer.getSize();
2490		break;
2491	case GL_UNIFORM_BUFFER_START: // indexed[n] 64-bit integer, initially 0
2492		*param = uniformBuffer.getOffset();
2493		break;
2494	default:
2495		return false;
2496	}
2497
2498	return true;
2499}
2500
2501bool Context::getQueryParameterInfo(GLenum pname, GLenum *type, unsigned int *numParams) const
2502{
2503    // Please note: the query type returned for DEPTH_CLEAR_VALUE in this implementation
2504    // is FLOAT rather than INT, as would be suggested by the GL ES 2.0 spec. This is due
2505    // to the fact that it is stored internally as a float, and so would require conversion
2506    // if returned from Context::getIntegerv. Since this conversion is already implemented
2507    // in the case that one calls glGetIntegerv to retrieve a float-typed state variable, we
2508    // place DEPTH_CLEAR_VALUE with the floats. This should make no difference to the calling
2509    // application.
2510    switch(pname)
2511    {
2512    case GL_COMPRESSED_TEXTURE_FORMATS:
2513		{
2514            *type = GL_INT;
2515			*numParams = NUM_COMPRESSED_TEXTURE_FORMATS;
2516        }
2517		break;
2518    case GL_SHADER_BINARY_FORMATS:
2519        {
2520            *type = GL_INT;
2521            *numParams = 0;
2522        }
2523        break;
2524    case GL_MAX_VERTEX_ATTRIBS:
2525    case GL_MAX_VERTEX_UNIFORM_VECTORS:
2526    case GL_MAX_VARYING_VECTORS:
2527    case GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS:
2528    case GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:
2529    case GL_MAX_TEXTURE_IMAGE_UNITS:
2530    case GL_MAX_FRAGMENT_UNIFORM_VECTORS:
2531    case GL_MAX_RENDERBUFFER_SIZE:
2532    case GL_NUM_SHADER_BINARY_FORMATS:
2533    case GL_NUM_COMPRESSED_TEXTURE_FORMATS:
2534    case GL_ARRAY_BUFFER_BINDING:
2535    case GL_FRAMEBUFFER_BINDING: // Same as GL_DRAW_FRAMEBUFFER_BINDING_ANGLE
2536    case GL_READ_FRAMEBUFFER_BINDING_ANGLE:
2537    case GL_RENDERBUFFER_BINDING:
2538    case GL_CURRENT_PROGRAM:
2539    case GL_PACK_ALIGNMENT:
2540    case GL_UNPACK_ALIGNMENT:
2541    case GL_GENERATE_MIPMAP_HINT:
2542    case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES:
2543    case GL_RED_BITS:
2544    case GL_GREEN_BITS:
2545    case GL_BLUE_BITS:
2546    case GL_ALPHA_BITS:
2547    case GL_DEPTH_BITS:
2548    case GL_STENCIL_BITS:
2549    case GL_ELEMENT_ARRAY_BUFFER_BINDING:
2550    case GL_CULL_FACE_MODE:
2551    case GL_FRONT_FACE:
2552    case GL_ACTIVE_TEXTURE:
2553    case GL_STENCIL_FUNC:
2554    case GL_STENCIL_VALUE_MASK:
2555    case GL_STENCIL_REF:
2556    case GL_STENCIL_FAIL:
2557    case GL_STENCIL_PASS_DEPTH_FAIL:
2558    case GL_STENCIL_PASS_DEPTH_PASS:
2559    case GL_STENCIL_BACK_FUNC:
2560    case GL_STENCIL_BACK_VALUE_MASK:
2561    case GL_STENCIL_BACK_REF:
2562    case GL_STENCIL_BACK_FAIL:
2563    case GL_STENCIL_BACK_PASS_DEPTH_FAIL:
2564    case GL_STENCIL_BACK_PASS_DEPTH_PASS:
2565    case GL_DEPTH_FUNC:
2566    case GL_BLEND_SRC_RGB:
2567    case GL_BLEND_SRC_ALPHA:
2568    case GL_BLEND_DST_RGB:
2569    case GL_BLEND_DST_ALPHA:
2570    case GL_BLEND_EQUATION_RGB:
2571    case GL_BLEND_EQUATION_ALPHA:
2572    case GL_STENCIL_WRITEMASK:
2573    case GL_STENCIL_BACK_WRITEMASK:
2574    case GL_STENCIL_CLEAR_VALUE:
2575    case GL_SUBPIXEL_BITS:
2576    case GL_MAX_TEXTURE_SIZE:
2577    case GL_MAX_CUBE_MAP_TEXTURE_SIZE:
2578    case GL_SAMPLE_BUFFERS:
2579    case GL_SAMPLES:
2580    case GL_IMPLEMENTATION_COLOR_READ_TYPE:
2581    case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
2582    case GL_TEXTURE_BINDING_2D:
2583    case GL_TEXTURE_BINDING_CUBE_MAP:
2584    case GL_TEXTURE_BINDING_EXTERNAL_OES:
2585    case GL_TEXTURE_BINDING_3D_OES:
2586    case GL_COPY_READ_BUFFER_BINDING:
2587    case GL_COPY_WRITE_BUFFER_BINDING:
2588    case GL_DRAW_BUFFER0:
2589    case GL_DRAW_BUFFER1:
2590    case GL_DRAW_BUFFER2:
2591    case GL_DRAW_BUFFER3:
2592    case GL_DRAW_BUFFER4:
2593    case GL_DRAW_BUFFER5:
2594    case GL_DRAW_BUFFER6:
2595    case GL_DRAW_BUFFER7:
2596    case GL_DRAW_BUFFER8:
2597    case GL_DRAW_BUFFER9:
2598    case GL_DRAW_BUFFER10:
2599    case GL_DRAW_BUFFER11:
2600    case GL_DRAW_BUFFER12:
2601    case GL_DRAW_BUFFER13:
2602    case GL_DRAW_BUFFER14:
2603    case GL_DRAW_BUFFER15:
2604    case GL_MAJOR_VERSION:
2605    case GL_MAX_3D_TEXTURE_SIZE:
2606    case GL_MAX_ARRAY_TEXTURE_LAYERS:
2607    case GL_MAX_COLOR_ATTACHMENTS:
2608    case GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS:
2609    case GL_MAX_COMBINED_UNIFORM_BLOCKS:
2610    case GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS:
2611    case GL_MAX_DRAW_BUFFERS:
2612    case GL_MAX_ELEMENT_INDEX:
2613    case GL_MAX_ELEMENTS_INDICES:
2614    case GL_MAX_ELEMENTS_VERTICES:
2615    case GL_MAX_FRAGMENT_INPUT_COMPONENTS:
2616    case GL_MAX_FRAGMENT_UNIFORM_BLOCKS:
2617    case GL_MAX_FRAGMENT_UNIFORM_COMPONENTS:
2618    case GL_MAX_PROGRAM_TEXEL_OFFSET:
2619    case GL_MAX_SERVER_WAIT_TIMEOUT:
2620    case GL_MAX_TEXTURE_LOD_BIAS:
2621    case GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS:
2622    case GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS:
2623    case GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS:
2624    case GL_MAX_UNIFORM_BLOCK_SIZE:
2625    case GL_MAX_UNIFORM_BUFFER_BINDINGS:
2626    case GL_MAX_VARYING_COMPONENTS:
2627    case GL_MAX_VERTEX_OUTPUT_COMPONENTS:
2628    case GL_MAX_VERTEX_UNIFORM_BLOCKS:
2629    case GL_MAX_VERTEX_UNIFORM_COMPONENTS:
2630    case GL_MIN_PROGRAM_TEXEL_OFFSET:
2631    case GL_MINOR_VERSION:
2632    case GL_NUM_EXTENSIONS:
2633    case GL_NUM_PROGRAM_BINARY_FORMATS:
2634    case GL_PACK_ROW_LENGTH:
2635    case GL_PACK_SKIP_PIXELS:
2636    case GL_PACK_SKIP_ROWS:
2637    case GL_PIXEL_PACK_BUFFER_BINDING:
2638    case GL_PIXEL_UNPACK_BUFFER_BINDING:
2639    case GL_PROGRAM_BINARY_FORMATS:
2640    case GL_READ_BUFFER:
2641    case GL_SAMPLER_BINDING:
2642    case GL_TEXTURE_BINDING_2D_ARRAY:
2643    case GL_UNIFORM_BUFFER_BINDING:
2644    case GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT:
2645    case GL_UNIFORM_BUFFER_SIZE:
2646    case GL_UNIFORM_BUFFER_START:
2647    case GL_UNPACK_IMAGE_HEIGHT:
2648    case GL_UNPACK_ROW_LENGTH:
2649    case GL_UNPACK_SKIP_IMAGES:
2650    case GL_UNPACK_SKIP_PIXELS:
2651    case GL_UNPACK_SKIP_ROWS:
2652    case GL_VERTEX_ARRAY_BINDING:
2653	case GL_TRANSFORM_FEEDBACK_BINDING:
2654	case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING:
2655        {
2656            *type = GL_INT;
2657            *numParams = 1;
2658        }
2659        break;
2660    case GL_MAX_SAMPLES_ANGLE:
2661        {
2662            *type = GL_INT;
2663            *numParams = 1;
2664        }
2665        break;
2666    case GL_MAX_VIEWPORT_DIMS:
2667        {
2668            *type = GL_INT;
2669            *numParams = 2;
2670        }
2671        break;
2672    case GL_VIEWPORT:
2673    case GL_SCISSOR_BOX:
2674        {
2675            *type = GL_INT;
2676            *numParams = 4;
2677        }
2678        break;
2679    case GL_SHADER_COMPILER:
2680    case GL_SAMPLE_COVERAGE_INVERT:
2681    case GL_DEPTH_WRITEMASK:
2682    case GL_CULL_FACE:                // CULL_FACE through DITHER are natural to IsEnabled,
2683    case GL_POLYGON_OFFSET_FILL:      // but can be retrieved through the Get{Type}v queries.
2684    case GL_SAMPLE_ALPHA_TO_COVERAGE: // For this purpose, they are treated here as bool-natural
2685    case GL_SAMPLE_COVERAGE:
2686    case GL_SCISSOR_TEST:
2687    case GL_STENCIL_TEST:
2688    case GL_DEPTH_TEST:
2689    case GL_BLEND:
2690    case GL_DITHER:
2691    case GL_PRIMITIVE_RESTART_FIXED_INDEX:
2692    case GL_RASTERIZER_DISCARD:
2693    case GL_TRANSFORM_FEEDBACK_ACTIVE:
2694    case GL_TRANSFORM_FEEDBACK_PAUSED:
2695        {
2696            *type = GL_BOOL;
2697            *numParams = 1;
2698        }
2699        break;
2700    case GL_COLOR_WRITEMASK:
2701        {
2702            *type = GL_BOOL;
2703            *numParams = 4;
2704        }
2705        break;
2706    case GL_POLYGON_OFFSET_FACTOR:
2707    case GL_POLYGON_OFFSET_UNITS:
2708    case GL_SAMPLE_COVERAGE_VALUE:
2709    case GL_DEPTH_CLEAR_VALUE:
2710    case GL_LINE_WIDTH:
2711        {
2712            *type = GL_FLOAT;
2713            *numParams = 1;
2714        }
2715        break;
2716    case GL_ALIASED_LINE_WIDTH_RANGE:
2717    case GL_ALIASED_POINT_SIZE_RANGE:
2718    case GL_DEPTH_RANGE:
2719        {
2720            *type = GL_FLOAT;
2721            *numParams = 2;
2722        }
2723        break;
2724    case GL_COLOR_CLEAR_VALUE:
2725    case GL_BLEND_COLOR:
2726        {
2727            *type = GL_FLOAT;
2728            *numParams = 4;
2729        }
2730        break;
2731	case GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT:
2732        *type = GL_FLOAT;
2733        *numParams = 1;
2734        break;
2735    default:
2736        return false;
2737    }
2738
2739    return true;
2740}
2741
2742void Context::applyScissor(int width, int height)
2743{
2744	if(mState.scissorTestEnabled)
2745	{
2746		sw::Rect scissor = { mState.scissorX, mState.scissorY, mState.scissorX + mState.scissorWidth, mState.scissorY + mState.scissorHeight };
2747		scissor.clip(0, 0, width, height);
2748
2749		device->setScissorRect(scissor);
2750		device->setScissorEnable(true);
2751	}
2752	else
2753	{
2754		device->setScissorEnable(false);
2755	}
2756}
2757
2758egl::Image *Context::getScissoredImage(GLint drawbuffer, int &x0, int &y0, int &width, int &height, bool depthStencil)
2759{
2760	Framebuffer* framebuffer = getDrawFramebuffer();
2761	egl::Image* image = depthStencil ? framebuffer->getDepthStencil() : framebuffer->getRenderTarget(drawbuffer);
2762
2763	applyScissor(image->getWidth(), image->getHeight());
2764
2765	device->getScissoredRegion(image, x0, y0, width, height);
2766
2767	return image;
2768}
2769
2770// Applies the render target surface, depth stencil surface, viewport rectangle and scissor rectangle
2771bool Context::applyRenderTarget()
2772{
2773    Framebuffer *framebuffer = getDrawFramebuffer();
2774	int width, height, samples;
2775
2776    if(!framebuffer || framebuffer->completeness(width, height, samples) != GL_FRAMEBUFFER_COMPLETE)
2777    {
2778        return error(GL_INVALID_FRAMEBUFFER_OPERATION, false);
2779    }
2780
2781	for(int i = 0; i < MAX_DRAW_BUFFERS; ++i)
2782	{
2783		egl::Image *renderTarget = framebuffer->getRenderTarget(i);
2784		device->setRenderTarget(i, renderTarget);
2785		if(renderTarget) renderTarget->release();
2786	}
2787
2788    egl::Image *depthStencil = framebuffer->getDepthStencil();
2789    device->setDepthStencilSurface(depthStencil);
2790	if(depthStencil) depthStencil->release();
2791
2792    Viewport viewport;
2793    float zNear = clamp01(mState.zNear);
2794    float zFar = clamp01(mState.zFar);
2795
2796    viewport.x0 = mState.viewportX;
2797    viewport.y0 = mState.viewportY;
2798    viewport.width = mState.viewportWidth;
2799    viewport.height = mState.viewportHeight;
2800    viewport.minZ = zNear;
2801    viewport.maxZ = zFar;
2802
2803    device->setViewport(viewport);
2804
2805	applyScissor(width, height);
2806
2807	Program *program = getCurrentProgram();
2808
2809	if(program)
2810	{
2811		GLfloat nearFarDiff[3] = {zNear, zFar, zFar - zNear};
2812        program->setUniform1fv(program->getUniformLocation("gl_DepthRange.near"), 1, &nearFarDiff[0]);
2813		program->setUniform1fv(program->getUniformLocation("gl_DepthRange.far"), 1, &nearFarDiff[1]);
2814		program->setUniform1fv(program->getUniformLocation("gl_DepthRange.diff"), 1, &nearFarDiff[2]);
2815    }
2816
2817    return true;
2818}
2819
2820// Applies the fixed-function state (culling, depth test, alpha blending, stenciling, etc)
2821void Context::applyState(GLenum drawMode)
2822{
2823    Framebuffer *framebuffer = getDrawFramebuffer();
2824
2825    if(mState.cullFaceEnabled)
2826    {
2827        device->setCullMode(es2sw::ConvertCullMode(mState.cullMode, mState.frontFace));
2828    }
2829    else
2830    {
2831		device->setCullMode(sw::CULL_NONE);
2832    }
2833
2834    if(mDepthStateDirty)
2835    {
2836        if(mState.depthTestEnabled)
2837        {
2838			device->setDepthBufferEnable(true);
2839			device->setDepthCompare(es2sw::ConvertDepthComparison(mState.depthFunc));
2840        }
2841        else
2842        {
2843            device->setDepthBufferEnable(false);
2844        }
2845
2846        mDepthStateDirty = false;
2847    }
2848
2849    if(mBlendStateDirty)
2850    {
2851        if(mState.blendEnabled)
2852        {
2853			device->setAlphaBlendEnable(true);
2854			device->setSeparateAlphaBlendEnable(true);
2855
2856            device->setBlendConstant(es2sw::ConvertColor(mState.blendColor));
2857
2858			device->setSourceBlendFactor(es2sw::ConvertBlendFunc(mState.sourceBlendRGB));
2859			device->setDestBlendFactor(es2sw::ConvertBlendFunc(mState.destBlendRGB));
2860			device->setBlendOperation(es2sw::ConvertBlendOp(mState.blendEquationRGB));
2861
2862            device->setSourceBlendFactorAlpha(es2sw::ConvertBlendFunc(mState.sourceBlendAlpha));
2863			device->setDestBlendFactorAlpha(es2sw::ConvertBlendFunc(mState.destBlendAlpha));
2864			device->setBlendOperationAlpha(es2sw::ConvertBlendOp(mState.blendEquationAlpha));
2865        }
2866        else
2867        {
2868			device->setAlphaBlendEnable(false);
2869        }
2870
2871        mBlendStateDirty = false;
2872    }
2873
2874    if(mStencilStateDirty || mFrontFaceDirty)
2875    {
2876        if(mState.stencilTestEnabled && framebuffer->hasStencil())
2877        {
2878			device->setStencilEnable(true);
2879			device->setTwoSidedStencil(true);
2880
2881            // get the maximum size of the stencil ref
2882            Renderbuffer *stencilbuffer = framebuffer->getStencilbuffer();
2883            GLuint maxStencil = (1 << stencilbuffer->getStencilSize()) - 1;
2884
2885			if(mState.frontFace == GL_CCW)
2886			{
2887				device->setStencilWriteMask(mState.stencilWritemask);
2888				device->setStencilCompare(es2sw::ConvertStencilComparison(mState.stencilFunc));
2889
2890				device->setStencilReference((mState.stencilRef < (GLint)maxStencil) ? mState.stencilRef : maxStencil);
2891				device->setStencilMask(mState.stencilMask);
2892
2893				device->setStencilFailOperation(es2sw::ConvertStencilOp(mState.stencilFail));
2894				device->setStencilZFailOperation(es2sw::ConvertStencilOp(mState.stencilPassDepthFail));
2895				device->setStencilPassOperation(es2sw::ConvertStencilOp(mState.stencilPassDepthPass));
2896
2897				device->setStencilWriteMaskCCW(mState.stencilBackWritemask);
2898				device->setStencilCompareCCW(es2sw::ConvertStencilComparison(mState.stencilBackFunc));
2899
2900				device->setStencilReferenceCCW((mState.stencilBackRef < (GLint)maxStencil) ? mState.stencilBackRef : maxStencil);
2901				device->setStencilMaskCCW(mState.stencilBackMask);
2902
2903				device->setStencilFailOperationCCW(es2sw::ConvertStencilOp(mState.stencilBackFail));
2904				device->setStencilZFailOperationCCW(es2sw::ConvertStencilOp(mState.stencilBackPassDepthFail));
2905				device->setStencilPassOperationCCW(es2sw::ConvertStencilOp(mState.stencilBackPassDepthPass));
2906			}
2907			else
2908			{
2909				device->setStencilWriteMaskCCW(mState.stencilWritemask);
2910				device->setStencilCompareCCW(es2sw::ConvertStencilComparison(mState.stencilFunc));
2911
2912				device->setStencilReferenceCCW((mState.stencilRef < (GLint)maxStencil) ? mState.stencilRef : maxStencil);
2913				device->setStencilMaskCCW(mState.stencilMask);
2914
2915				device->setStencilFailOperationCCW(es2sw::ConvertStencilOp(mState.stencilFail));
2916				device->setStencilZFailOperationCCW(es2sw::ConvertStencilOp(mState.stencilPassDepthFail));
2917				device->setStencilPassOperationCCW(es2sw::ConvertStencilOp(mState.stencilPassDepthPass));
2918
2919				device->setStencilWriteMask(mState.stencilBackWritemask);
2920				device->setStencilCompare(es2sw::ConvertStencilComparison(mState.stencilBackFunc));
2921
2922				device->setStencilReference((mState.stencilBackRef < (GLint)maxStencil) ? mState.stencilBackRef : maxStencil);
2923				device->setStencilMask(mState.stencilBackMask);
2924
2925				device->setStencilFailOperation(es2sw::ConvertStencilOp(mState.stencilBackFail));
2926				device->setStencilZFailOperation(es2sw::ConvertStencilOp(mState.stencilBackPassDepthFail));
2927				device->setStencilPassOperation(es2sw::ConvertStencilOp(mState.stencilBackPassDepthPass));
2928			}
2929        }
2930        else
2931        {
2932			device->setStencilEnable(false);
2933        }
2934
2935        mStencilStateDirty = false;
2936        mFrontFaceDirty = false;
2937    }
2938
2939    if(mMaskStateDirty)
2940    {
2941		device->setColorWriteMask(0, es2sw::ConvertColorMask(mState.colorMaskRed, mState.colorMaskGreen, mState.colorMaskBlue, mState.colorMaskAlpha));
2942		device->setDepthWriteEnable(mState.depthMask);
2943
2944        mMaskStateDirty = false;
2945    }
2946
2947    if(mPolygonOffsetStateDirty)
2948    {
2949        if(mState.polygonOffsetFillEnabled)
2950        {
2951            Renderbuffer *depthbuffer = framebuffer->getDepthbuffer();
2952            if(depthbuffer)
2953            {
2954				device->setSlopeDepthBias(mState.polygonOffsetFactor);
2955                float depthBias = ldexp(mState.polygonOffsetUnits, -(int)(depthbuffer->getDepthSize()));
2956				device->setDepthBias(depthBias);
2957            }
2958        }
2959        else
2960        {
2961            device->setSlopeDepthBias(0);
2962            device->setDepthBias(0);
2963        }
2964
2965        mPolygonOffsetStateDirty = false;
2966    }
2967
2968    if(mSampleStateDirty)
2969    {
2970        if(mState.sampleAlphaToCoverageEnabled)
2971        {
2972            device->setTransparencyAntialiasing(sw::TRANSPARENCY_ALPHA_TO_COVERAGE);
2973        }
2974		else
2975		{
2976			device->setTransparencyAntialiasing(sw::TRANSPARENCY_NONE);
2977		}
2978
2979        if(mState.sampleCoverageEnabled)
2980        {
2981            unsigned int mask = 0;
2982            if(mState.sampleCoverageValue != 0)
2983            {
2984				int width, height, samples;
2985				framebuffer->completeness(width, height, samples);
2986
2987                float threshold = 0.5f;
2988
2989                for(int i = 0; i < samples; i++)
2990                {
2991                    mask <<= 1;
2992
2993                    if((i + 1) * mState.sampleCoverageValue >= threshold)
2994                    {
2995                        threshold += 1.0f;
2996                        mask |= 1;
2997                    }
2998                }
2999            }
3000
3001            if(mState.sampleCoverageInvert)
3002            {
3003                mask = ~mask;
3004            }
3005
3006			device->setMultiSampleMask(mask);
3007        }
3008        else
3009        {
3010			device->setMultiSampleMask(0xFFFFFFFF);
3011        }
3012
3013        mSampleStateDirty = false;
3014    }
3015
3016    if(mDitherStateDirty)
3017    {
3018    //	UNIMPLEMENTED();   // FIXME
3019
3020        mDitherStateDirty = false;
3021    }
3022}
3023
3024GLenum Context::applyVertexBuffer(GLint base, GLint first, GLsizei count, GLsizei instanceId)
3025{
3026    TranslatedAttribute attributes[MAX_VERTEX_ATTRIBS];
3027
3028    GLenum err = mVertexDataManager->prepareVertexData(first, count, attributes, instanceId);
3029    if(err != GL_NO_ERROR)
3030    {
3031        return err;
3032    }
3033
3034	Program *program = getCurrentProgram();
3035
3036	device->resetInputStreams(false);
3037
3038    for(int i = 0; i < MAX_VERTEX_ATTRIBS; i++)
3039	{
3040		if(program->getAttributeStream(i) == -1)
3041		{
3042			continue;
3043		}
3044
3045		sw::Resource *resource = attributes[i].vertexBuffer;
3046		const void *buffer = (char*)resource->data() + attributes[i].offset;
3047
3048		int stride = attributes[i].stride;
3049
3050		buffer = (char*)buffer + stride * base;
3051
3052		sw::Stream attribute(resource, buffer, stride);
3053
3054		attribute.type = attributes[i].type;
3055		attribute.count = attributes[i].count;
3056		attribute.normalized = attributes[i].normalized;
3057
3058		int stream = program->getAttributeStream(i);
3059		device->setInputStream(stream, attribute);
3060	}
3061
3062	return GL_NO_ERROR;
3063}
3064
3065// Applies the indices and element array bindings
3066GLenum Context::applyIndexBuffer(const void *indices, GLuint start, GLuint end, GLsizei count, GLenum mode, GLenum type, TranslatedIndexData *indexInfo)
3067{
3068	GLenum err = mIndexDataManager->prepareIndexData(type, start, end, count, getCurrentVertexArray()->getElementArrayBuffer(), indices, indexInfo);
3069
3070    if(err == GL_NO_ERROR)
3071    {
3072        device->setIndexBuffer(indexInfo->indexBuffer);
3073    }
3074
3075    return err;
3076}
3077
3078// Applies the shaders and shader constants
3079void Context::applyShaders()
3080{
3081    Program *programObject = getCurrentProgram();
3082    sw::VertexShader *vertexShader = programObject->getVertexShader();
3083	sw::PixelShader *pixelShader = programObject->getPixelShader();
3084
3085    device->setVertexShader(vertexShader);
3086    device->setPixelShader(pixelShader);
3087
3088    if(programObject->getSerial() != mAppliedProgramSerial)
3089    {
3090        programObject->dirtyAllUniforms();
3091        mAppliedProgramSerial = programObject->getSerial();
3092    }
3093
3094    programObject->applyUniformBuffers(mState.uniformBuffers);
3095    programObject->applyUniforms();
3096}
3097
3098void Context::applyTextures()
3099{
3100    applyTextures(sw::SAMPLER_PIXEL);
3101	applyTextures(sw::SAMPLER_VERTEX);
3102}
3103
3104void Context::applyTextures(sw::SamplerType samplerType)
3105{
3106    Program *programObject = getCurrentProgram();
3107
3108    int samplerCount = (samplerType == sw::SAMPLER_PIXEL) ? MAX_TEXTURE_IMAGE_UNITS : MAX_VERTEX_TEXTURE_IMAGE_UNITS;   // Range of samplers of given sampler type
3109
3110    for(int samplerIndex = 0; samplerIndex < samplerCount; samplerIndex++)
3111    {
3112        int textureUnit = programObject->getSamplerMapping(samplerType, samplerIndex);   // OpenGL texture image unit index
3113
3114        if(textureUnit != -1)
3115        {
3116            TextureType textureType = programObject->getSamplerTextureType(samplerType, samplerIndex);
3117
3118            Texture *texture = getSamplerTexture(textureUnit, textureType);
3119
3120			if(texture->isSamplerComplete())
3121            {
3122				GLenum wrapS, wrapT, wrapR, minFilter, magFilter;
3123
3124				Sampler *samplerObject = mState.sampler[textureUnit];
3125				if(samplerObject)
3126				{
3127					wrapS = samplerObject->getWrapS();
3128					wrapT = samplerObject->getWrapT();
3129					wrapR = samplerObject->getWrapR();
3130					minFilter = samplerObject->getMinFilter();
3131					magFilter = samplerObject->getMagFilter();
3132				}
3133				else
3134				{
3135					wrapS = texture->getWrapS();
3136					wrapT = texture->getWrapT();
3137					wrapR = texture->getWrapR();
3138					minFilter = texture->getMinFilter();
3139					magFilter = texture->getMagFilter();
3140				}
3141				GLfloat maxAnisotropy = texture->getMaxAnisotropy();
3142
3143				GLenum swizzleR = texture->getSwizzleR();
3144				GLenum swizzleG = texture->getSwizzleG();
3145				GLenum swizzleB = texture->getSwizzleB();
3146				GLenum swizzleA = texture->getSwizzleA();
3147
3148				device->setAddressingModeU(samplerType, samplerIndex, es2sw::ConvertTextureWrap(wrapS));
3149				device->setAddressingModeV(samplerType, samplerIndex, es2sw::ConvertTextureWrap(wrapT));
3150				device->setAddressingModeW(samplerType, samplerIndex, es2sw::ConvertTextureWrap(wrapR));
3151				device->setSwizzleR(samplerType, samplerIndex, es2sw::ConvertSwizzleType(swizzleR));
3152				device->setSwizzleG(samplerType, samplerIndex, es2sw::ConvertSwizzleType(swizzleG));
3153				device->setSwizzleB(samplerType, samplerIndex, es2sw::ConvertSwizzleType(swizzleB));
3154				device->setSwizzleA(samplerType, samplerIndex, es2sw::ConvertSwizzleType(swizzleA));
3155
3156				device->setTextureFilter(samplerType, samplerIndex, es2sw::ConvertTextureFilter(minFilter, magFilter, maxAnisotropy));
3157				device->setMipmapFilter(samplerType, samplerIndex, es2sw::ConvertMipMapFilter(minFilter));
3158				device->setMaxAnisotropy(samplerType, samplerIndex, maxAnisotropy);
3159
3160				applyTexture(samplerType, samplerIndex, texture);
3161            }
3162            else
3163            {
3164                applyTexture(samplerType, samplerIndex, nullptr);
3165            }
3166        }
3167        else
3168        {
3169            applyTexture(samplerType, samplerIndex, nullptr);
3170        }
3171    }
3172}
3173
3174void Context::applyTexture(sw::SamplerType type, int index, Texture *baseTexture)
3175{
3176	Program *program = getCurrentProgram();
3177	int sampler = (type == sw::SAMPLER_PIXEL) ? index : 16 + index;
3178	bool textureUsed = false;
3179
3180	if(type == sw::SAMPLER_PIXEL)
3181	{
3182		textureUsed = program->getPixelShader()->usesSampler(index);
3183	}
3184	else if(type == sw::SAMPLER_VERTEX)
3185	{
3186		textureUsed = program->getVertexShader()->usesSampler(index);
3187	}
3188	else UNREACHABLE(type);
3189
3190	sw::Resource *resource = 0;
3191
3192	if(baseTexture && textureUsed)
3193	{
3194		resource = baseTexture->getResource();
3195	}
3196
3197	device->setTextureResource(sampler, resource);
3198
3199	if(baseTexture && textureUsed)
3200	{
3201		int levelCount = baseTexture->getLevelCount();
3202
3203		if(baseTexture->getTarget() == GL_TEXTURE_2D || baseTexture->getTarget() == GL_TEXTURE_EXTERNAL_OES)
3204		{
3205			Texture2D *texture = static_cast<Texture2D*>(baseTexture);
3206
3207			for(int mipmapLevel = 0; mipmapLevel < MIPMAP_LEVELS; mipmapLevel++)
3208			{
3209				int surfaceLevel = mipmapLevel;
3210
3211				if(surfaceLevel < 0)
3212				{
3213					surfaceLevel = 0;
3214				}
3215				else if(surfaceLevel >= levelCount)
3216				{
3217					surfaceLevel = levelCount - 1;
3218				}
3219
3220				egl::Image *surface = texture->getImage(surfaceLevel);
3221				device->setTextureLevel(sampler, 0, mipmapLevel, surface, sw::TEXTURE_2D);
3222			}
3223		}
3224		else if(baseTexture->getTarget() == GL_TEXTURE_3D_OES)
3225		{
3226			Texture3D *texture = static_cast<Texture3D*>(baseTexture);
3227
3228			for(int mipmapLevel = 0; mipmapLevel < MIPMAP_LEVELS; mipmapLevel++)
3229			{
3230				int surfaceLevel = mipmapLevel;
3231
3232				if(surfaceLevel < 0)
3233				{
3234					surfaceLevel = 0;
3235				}
3236				else if(surfaceLevel >= levelCount)
3237				{
3238					surfaceLevel = levelCount - 1;
3239				}
3240
3241				egl::Image *surface = texture->getImage(surfaceLevel);
3242				device->setTextureLevel(sampler, 0, mipmapLevel, surface, sw::TEXTURE_3D);
3243			}
3244		}
3245		else if(baseTexture->getTarget() == GL_TEXTURE_2D_ARRAY)
3246		{
3247			Texture2DArray *texture = static_cast<Texture2DArray*>(baseTexture);
3248
3249			for(int mipmapLevel = 0; mipmapLevel < MIPMAP_LEVELS; mipmapLevel++)
3250			{
3251				int surfaceLevel = mipmapLevel;
3252
3253				if(surfaceLevel < 0)
3254				{
3255					surfaceLevel = 0;
3256				}
3257				else if(surfaceLevel >= levelCount)
3258				{
3259					surfaceLevel = levelCount - 1;
3260				}
3261
3262				egl::Image *surface = texture->getImage(surfaceLevel);
3263				device->setTextureLevel(sampler, 0, mipmapLevel, surface, sw::TEXTURE_2D_ARRAY);
3264			}
3265		}
3266		else if(baseTexture->getTarget() == GL_TEXTURE_CUBE_MAP)
3267		{
3268			for(int face = 0; face < 6; face++)
3269			{
3270				TextureCubeMap *cubeTexture = static_cast<TextureCubeMap*>(baseTexture);
3271
3272				for(int mipmapLevel = 0; mipmapLevel < MIPMAP_LEVELS; mipmapLevel++)
3273				{
3274					int surfaceLevel = mipmapLevel;
3275
3276					if(surfaceLevel < 0)
3277					{
3278						surfaceLevel = 0;
3279					}
3280					else if(surfaceLevel >= levelCount)
3281					{
3282						surfaceLevel = levelCount - 1;
3283					}
3284
3285					egl::Image *surface = cubeTexture->getImage(face, surfaceLevel);
3286					device->setTextureLevel(sampler, face, mipmapLevel, surface, sw::TEXTURE_CUBE);
3287				}
3288			}
3289		}
3290		else UNIMPLEMENTED();
3291	}
3292	else
3293	{
3294		device->setTextureLevel(sampler, 0, 0, 0, sw::TEXTURE_NULL);
3295	}
3296}
3297
3298void Context::readPixels(GLint x, GLint y, GLsizei width, GLsizei height,
3299                         GLenum format, GLenum type, GLsizei *bufSize, void* pixels)
3300{
3301    Framebuffer *framebuffer = getReadFramebuffer();
3302	int framebufferWidth, framebufferHeight, framebufferSamples;
3303
3304    if(framebuffer->completeness(framebufferWidth, framebufferHeight, framebufferSamples) != GL_FRAMEBUFFER_COMPLETE)
3305    {
3306        return error(GL_INVALID_FRAMEBUFFER_OPERATION);
3307    }
3308
3309    if(getReadFramebufferName() != 0 && framebufferSamples != 0)
3310    {
3311        return error(GL_INVALID_OPERATION);
3312    }
3313
3314	GLenum readFormat = framebuffer->getImplementationColorReadFormat();
3315	GLenum readType = framebuffer->getImplementationColorReadType();
3316
3317	if(!(readFormat == format && readType == type) && !ValidReadPixelsFormatType(readFormat, readType, format, type, clientVersion))
3318	{
3319		return error(GL_INVALID_OPERATION);
3320	}
3321
3322	GLsizei outputWidth = (mState.packRowLength > 0) ? mState.packRowLength : width;
3323	GLsizei outputPitch = egl::ComputePitch(outputWidth, format, type, mState.packAlignment);
3324	GLsizei outputHeight = (mState.packImageHeight == 0) ? height : mState.packImageHeight;
3325	pixels = getPixelPackBuffer() ? (unsigned char*)getPixelPackBuffer()->data() + (ptrdiff_t)pixels : (unsigned char*)pixels;
3326	pixels = ((char*)pixels) + egl::ComputePackingOffset(format, type, outputWidth, outputHeight, mState.packAlignment, mState.packSkipImages, mState.packSkipRows, mState.packSkipPixels);
3327
3328	// Sized query sanity check
3329    if(bufSize)
3330    {
3331        int requiredSize = outputPitch * height;
3332        if(requiredSize > *bufSize)
3333        {
3334            return error(GL_INVALID_OPERATION);
3335        }
3336    }
3337
3338    egl::Image *renderTarget = framebuffer->getReadRenderTarget();
3339
3340    if(!renderTarget)
3341    {
3342        return error(GL_OUT_OF_MEMORY);
3343    }
3344
3345	sw::Rect rect = {x, y, x + width, y + height};
3346	sw::Rect dstRect = { 0, 0, width, height };
3347	rect.clip(0, 0, renderTarget->getWidth(), renderTarget->getHeight());
3348
3349	sw::Surface externalSurface(width, height, 1, egl::ConvertFormatType(format, type), pixels, outputPitch, outputPitch * outputHeight);
3350	sw::SliceRect sliceRect(rect);
3351	sw::SliceRect dstSliceRect(dstRect);
3352	device->blit(renderTarget, sliceRect, &externalSurface, dstSliceRect, false);
3353
3354	renderTarget->release();
3355}
3356
3357void Context::clear(GLbitfield mask)
3358{
3359    Framebuffer *framebuffer = getDrawFramebuffer();
3360
3361    if(!framebuffer || framebuffer->completeness() != GL_FRAMEBUFFER_COMPLETE)
3362    {
3363        return error(GL_INVALID_FRAMEBUFFER_OPERATION);
3364    }
3365
3366    if(!applyRenderTarget())
3367    {
3368        return;
3369    }
3370
3371	if(mask & GL_COLOR_BUFFER_BIT)
3372	{
3373		unsigned int rgbaMask = getColorMask();
3374
3375		if(rgbaMask != 0)
3376		{
3377			device->clearColor(mState.colorClearValue.red, mState.colorClearValue.green, mState.colorClearValue.blue, mState.colorClearValue.alpha, rgbaMask);
3378		}
3379	}
3380
3381	if(mask & GL_DEPTH_BUFFER_BIT)
3382	{
3383		if(mState.depthMask != 0)
3384		{
3385			float depth = clamp01(mState.depthClearValue);
3386			device->clearDepth(depth);
3387		}
3388	}
3389
3390	if(mask & GL_STENCIL_BUFFER_BIT)
3391	{
3392		if(mState.stencilWritemask != 0)
3393		{
3394			int stencil = mState.stencilClearValue & 0x000000FF;
3395			device->clearStencil(stencil, mState.stencilWritemask);
3396		}
3397	}
3398}
3399
3400void Context::clearColorBuffer(GLint drawbuffer, void *value, sw::Format format)
3401{
3402	unsigned int rgbaMask = getColorMask();
3403	if(device && rgbaMask)
3404	{
3405		int x0(0), y0(0), width(0), height(0);
3406		egl::Image* image = getScissoredImage(drawbuffer, x0, y0, width, height, false);
3407
3408		sw::SliceRect sliceRect;
3409		if(image->getClearRect(x0, y0, width, height, sliceRect))
3410		{
3411			device->clear(value, format, image, sliceRect, rgbaMask);
3412		}
3413
3414		image->release();
3415	}
3416}
3417
3418void Context::clearColorBuffer(GLint drawbuffer, const GLint *value)
3419{
3420	clearColorBuffer(drawbuffer, (void*)value, sw::FORMAT_A32B32G32R32I);
3421}
3422
3423void Context::clearColorBuffer(GLint drawbuffer, const GLuint *value)
3424{
3425	clearColorBuffer(drawbuffer, (void*)value, sw::FORMAT_A32B32G32R32UI);
3426}
3427
3428void Context::clearColorBuffer(GLint drawbuffer, const GLfloat *value)
3429{
3430	clearColorBuffer(drawbuffer, (void*)value, sw::FORMAT_A32B32G32R32F);
3431}
3432
3433void Context::clearDepthBuffer(GLint drawbuffer, const GLfloat *value)
3434{
3435	if(device && mState.depthMask)
3436	{
3437		int x0(0), y0(0), width(0), height(0);
3438		egl::Image* image = getScissoredImage(drawbuffer, x0, y0, width, height, true);
3439
3440		float depth = clamp01(value[0]);
3441		image->clearDepthBuffer(depth, x0, y0, width, height);
3442
3443		image->release();
3444	}
3445}
3446
3447void Context::clearStencilBuffer(GLint drawbuffer, const GLint *value)
3448{
3449	if(device && mState.stencilWritemask)
3450	{
3451		int x0(0), y0(0), width(0), height(0);
3452		egl::Image* image = getScissoredImage(drawbuffer, x0, y0, width, height, true);
3453
3454		unsigned char stencil = value[0] < 0 ? 0 : static_cast<unsigned char>(value[0] & 0x000000FF);
3455		image->clearStencilBuffer(stencil, static_cast<unsigned char>(mState.stencilWritemask), x0, y0, width, height);
3456
3457		image->release();
3458	}
3459}
3460
3461void Context::clearDepthStencilBuffer(GLint drawbuffer, GLfloat depth, GLint stencil)
3462{
3463	if(device && (mState.depthMask || mState.stencilWritemask))
3464	{
3465		int x0(0), y0(0), width(0), height(0);
3466		egl::Image* image = getScissoredImage(drawbuffer, x0, y0, width, height, true);
3467
3468		if(mState.stencilWritemask)
3469		{
3470			image->clearStencilBuffer(static_cast<unsigned char>(stencil & 0x000000FF), static_cast<unsigned char>(mState.stencilWritemask), x0, y0, width, height);
3471		}
3472
3473		if(mState.depthMask)
3474		{
3475			image->clearDepthBuffer(clamp01(depth), x0, y0, width, height);
3476		}
3477
3478		image->release();
3479	}
3480}
3481
3482void Context::drawArrays(GLenum mode, GLint first, GLsizei count, GLsizei instanceCount)
3483{
3484    if(!mState.currentProgram)
3485    {
3486        return error(GL_INVALID_OPERATION);
3487    }
3488
3489    sw::DrawType primitiveType;
3490    int primitiveCount;
3491
3492    if(!es2sw::ConvertPrimitiveType(mode, count, GL_NONE, primitiveType, primitiveCount))
3493        return error(GL_INVALID_ENUM);
3494
3495    if(primitiveCount <= 0)
3496    {
3497        return;
3498    }
3499
3500    if(!applyRenderTarget())
3501    {
3502        return;
3503    }
3504
3505    applyState(mode);
3506
3507	for(int i = 0; i < instanceCount; ++i)
3508	{
3509		device->setInstanceID(i);
3510
3511		GLenum err = applyVertexBuffer(0, first, count, i);
3512		if(err != GL_NO_ERROR)
3513		{
3514			return error(err);
3515		}
3516
3517		applyShaders();
3518		applyTextures();
3519
3520		if(!getCurrentProgram()->validateSamplers(false))
3521		{
3522			return error(GL_INVALID_OPERATION);
3523		}
3524
3525		if(!cullSkipsDraw(mode))
3526		{
3527			device->drawPrimitive(primitiveType, primitiveCount);
3528		}
3529	}
3530}
3531
3532void Context::drawElements(GLenum mode, GLuint start, GLuint end, GLsizei count, GLenum type, const void *indices, GLsizei instanceCount)
3533{
3534    if(!mState.currentProgram)
3535    {
3536        return error(GL_INVALID_OPERATION);
3537    }
3538
3539	if(!indices && !getCurrentVertexArray()->getElementArrayBuffer())
3540    {
3541        return error(GL_INVALID_OPERATION);
3542    }
3543
3544    sw::DrawType primitiveType;
3545    int primitiveCount;
3546
3547    if(!es2sw::ConvertPrimitiveType(mode, count, type, primitiveType, primitiveCount))
3548        return error(GL_INVALID_ENUM);
3549
3550    if(primitiveCount <= 0)
3551    {
3552        return;
3553    }
3554
3555    if(!applyRenderTarget())
3556    {
3557        return;
3558    }
3559
3560    applyState(mode);
3561
3562	for(int i = 0; i < instanceCount; ++i)
3563	{
3564		device->setInstanceID(i);
3565
3566		TranslatedIndexData indexInfo;
3567		GLenum err = applyIndexBuffer(indices, start, end, count, mode, type, &indexInfo);
3568		if(err != GL_NO_ERROR)
3569		{
3570			return error(err);
3571		}
3572
3573		GLsizei vertexCount = indexInfo.maxIndex - indexInfo.minIndex + 1;
3574		err = applyVertexBuffer(-(int)indexInfo.minIndex, indexInfo.minIndex, vertexCount, i);
3575		if(err != GL_NO_ERROR)
3576		{
3577			return error(err);
3578		}
3579
3580		applyShaders();
3581		applyTextures();
3582
3583		if(!getCurrentProgram()->validateSamplers(false))
3584		{
3585			return error(GL_INVALID_OPERATION);
3586		}
3587
3588		if(!cullSkipsDraw(mode))
3589		{
3590			device->drawIndexedPrimitive(primitiveType, indexInfo.indexOffset, primitiveCount);
3591		}
3592	}
3593}
3594
3595void Context::finish()
3596{
3597	device->finish();
3598}
3599
3600void Context::flush()
3601{
3602    // We don't queue anything without processing it as fast as possible
3603}
3604
3605void Context::recordInvalidEnum()
3606{
3607    mInvalidEnum = true;
3608}
3609
3610void Context::recordInvalidValue()
3611{
3612    mInvalidValue = true;
3613}
3614
3615void Context::recordInvalidOperation()
3616{
3617    mInvalidOperation = true;
3618}
3619
3620void Context::recordOutOfMemory()
3621{
3622    mOutOfMemory = true;
3623}
3624
3625void Context::recordInvalidFramebufferOperation()
3626{
3627    mInvalidFramebufferOperation = true;
3628}
3629
3630// Get one of the recorded errors and clear its flag, if any.
3631// [OpenGL ES 2.0.24] section 2.5 page 13.
3632GLenum Context::getError()
3633{
3634    if(mInvalidEnum)
3635    {
3636        mInvalidEnum = false;
3637
3638        return GL_INVALID_ENUM;
3639    }
3640
3641    if(mInvalidValue)
3642    {
3643        mInvalidValue = false;
3644
3645        return GL_INVALID_VALUE;
3646    }
3647
3648    if(mInvalidOperation)
3649    {
3650        mInvalidOperation = false;
3651
3652        return GL_INVALID_OPERATION;
3653    }
3654
3655    if(mOutOfMemory)
3656    {
3657        mOutOfMemory = false;
3658
3659        return GL_OUT_OF_MEMORY;
3660    }
3661
3662    if(mInvalidFramebufferOperation)
3663    {
3664        mInvalidFramebufferOperation = false;
3665
3666        return GL_INVALID_FRAMEBUFFER_OPERATION;
3667    }
3668
3669    return GL_NO_ERROR;
3670}
3671
3672int Context::getSupportedMultisampleCount(int requested)
3673{
3674	int supported = 0;
3675
3676	for(int i = NUM_MULTISAMPLE_COUNTS - 1; i >= 0; i--)
3677	{
3678		if(supported >= requested)
3679		{
3680			return supported;
3681		}
3682
3683		supported = multisampleCount[i];
3684	}
3685
3686	return supported;
3687}
3688
3689void Context::detachBuffer(GLuint buffer)
3690{
3691	// [OpenGL ES 2.0.24] section 2.9 page 22:
3692	// If a buffer object is deleted while it is bound, all bindings to that object in the current context
3693	// (i.e. in the thread that called Delete-Buffers) are reset to zero.
3694
3695	if(mState.copyReadBuffer.name() == buffer)
3696	{
3697		mState.copyReadBuffer = nullptr;
3698	}
3699
3700	if(mState.copyWriteBuffer.name() == buffer)
3701	{
3702		mState.copyWriteBuffer = nullptr;
3703	}
3704
3705	if(mState.pixelPackBuffer.name() == buffer)
3706	{
3707		mState.pixelPackBuffer = nullptr;
3708	}
3709
3710	if(mState.pixelUnpackBuffer.name() == buffer)
3711	{
3712		mState.pixelUnpackBuffer = nullptr;
3713	}
3714
3715	if(mState.genericUniformBuffer.name() == buffer)
3716	{
3717		mState.genericUniformBuffer = nullptr;
3718	}
3719
3720	if(getArrayBufferName() == buffer)
3721	{
3722		mState.arrayBuffer = nullptr;
3723	}
3724
3725	// Only detach from the current transform feedback
3726	TransformFeedback* currentTransformFeedback = getTransformFeedback();
3727	if(currentTransformFeedback)
3728	{
3729		currentTransformFeedback->detachBuffer(buffer);
3730	}
3731
3732	// Only detach from the current vertex array
3733	VertexArray* currentVertexArray = getCurrentVertexArray();
3734	if(currentVertexArray)
3735	{
3736		currentVertexArray->detachBuffer(buffer);
3737	}
3738
3739	for(int attribute = 0; attribute < MAX_VERTEX_ATTRIBS; attribute++)
3740	{
3741		if(mState.vertexAttribute[attribute].mBoundBuffer.name() == buffer)
3742		{
3743			mState.vertexAttribute[attribute].mBoundBuffer = NULL;
3744		}
3745	}
3746}
3747
3748void Context::detachTexture(GLuint texture)
3749{
3750    // [OpenGL ES 2.0.24] section 3.8 page 84:
3751    // If a texture object is deleted, it is as if all texture units which are bound to that texture object are
3752    // rebound to texture object zero
3753
3754    for(int type = 0; type < TEXTURE_TYPE_COUNT; type++)
3755    {
3756        for(int sampler = 0; sampler < MAX_COMBINED_TEXTURE_IMAGE_UNITS; sampler++)
3757        {
3758            if(mState.samplerTexture[type][sampler].name() == texture)
3759            {
3760                mState.samplerTexture[type][sampler] = NULL;
3761            }
3762        }
3763    }
3764
3765    // [OpenGL ES 2.0.24] section 4.4 page 112:
3766    // If a texture object is deleted while its image is attached to the currently bound framebuffer, then it is
3767    // as if FramebufferTexture2D had been called, with a texture of 0, for each attachment point to which this
3768    // image was attached in the currently bound framebuffer.
3769
3770    Framebuffer *readFramebuffer = getReadFramebuffer();
3771    Framebuffer *drawFramebuffer = getDrawFramebuffer();
3772
3773    if(readFramebuffer)
3774    {
3775        readFramebuffer->detachTexture(texture);
3776    }
3777
3778    if(drawFramebuffer && drawFramebuffer != readFramebuffer)
3779    {
3780        drawFramebuffer->detachTexture(texture);
3781    }
3782}
3783
3784void Context::detachFramebuffer(GLuint framebuffer)
3785{
3786    // [OpenGL ES 2.0.24] section 4.4 page 107:
3787    // If a framebuffer that is currently bound to the target FRAMEBUFFER is deleted, it is as though
3788    // BindFramebuffer had been executed with the target of FRAMEBUFFER and framebuffer of zero.
3789
3790    if(mState.readFramebuffer == framebuffer)
3791    {
3792        bindReadFramebuffer(0);
3793    }
3794
3795    if(mState.drawFramebuffer == framebuffer)
3796    {
3797        bindDrawFramebuffer(0);
3798    }
3799}
3800
3801void Context::detachRenderbuffer(GLuint renderbuffer)
3802{
3803    // [OpenGL ES 2.0.24] section 4.4 page 109:
3804    // If a renderbuffer that is currently bound to RENDERBUFFER is deleted, it is as though BindRenderbuffer
3805    // had been executed with the target RENDERBUFFER and name of zero.
3806
3807    if(mState.renderbuffer.name() == renderbuffer)
3808    {
3809        bindRenderbuffer(0);
3810    }
3811
3812    // [OpenGL ES 2.0.24] section 4.4 page 111:
3813    // If a renderbuffer object is deleted while its image is attached to the currently bound framebuffer,
3814    // then it is as if FramebufferRenderbuffer had been called, with a renderbuffer of 0, for each attachment
3815    // point to which this image was attached in the currently bound framebuffer.
3816
3817    Framebuffer *readFramebuffer = getReadFramebuffer();
3818    Framebuffer *drawFramebuffer = getDrawFramebuffer();
3819
3820    if(readFramebuffer)
3821    {
3822        readFramebuffer->detachRenderbuffer(renderbuffer);
3823    }
3824
3825    if(drawFramebuffer && drawFramebuffer != readFramebuffer)
3826    {
3827        drawFramebuffer->detachRenderbuffer(renderbuffer);
3828    }
3829}
3830
3831void Context::detachSampler(GLuint sampler)
3832{
3833	// [OpenGL ES 3.0.2] section 3.8.2 pages 123-124:
3834	// If a sampler object that is currently bound to one or more texture units is
3835	// deleted, it is as though BindSampler is called once for each texture unit to
3836	// which the sampler is bound, with unit set to the texture unit and sampler set to zero.
3837	for(size_t textureUnit = 0; textureUnit < MAX_COMBINED_TEXTURE_IMAGE_UNITS; ++textureUnit)
3838	{
3839		gl::BindingPointer<Sampler> &samplerBinding = mState.sampler[textureUnit];
3840		if(samplerBinding.name() == sampler)
3841		{
3842			samplerBinding = NULL;
3843		}
3844	}
3845}
3846
3847bool Context::cullSkipsDraw(GLenum drawMode)
3848{
3849    return mState.cullFaceEnabled && mState.cullMode == GL_FRONT_AND_BACK && isTriangleMode(drawMode);
3850}
3851
3852bool Context::isTriangleMode(GLenum drawMode)
3853{
3854    switch (drawMode)
3855    {
3856      case GL_TRIANGLES:
3857      case GL_TRIANGLE_FAN:
3858      case GL_TRIANGLE_STRIP:
3859        return true;
3860      case GL_POINTS:
3861      case GL_LINES:
3862      case GL_LINE_LOOP:
3863      case GL_LINE_STRIP:
3864        return false;
3865      default: UNREACHABLE(drawMode);
3866    }
3867
3868    return false;
3869}
3870
3871void Context::setVertexAttrib(GLuint index, const GLfloat *values)
3872{
3873    ASSERT(index < MAX_VERTEX_ATTRIBS);
3874
3875    mState.vertexAttribute[index].setCurrentValue(values);
3876
3877    mVertexDataManager->dirtyCurrentValue(index);
3878}
3879
3880void Context::setVertexAttrib(GLuint index, const GLint *values)
3881{
3882	ASSERT(index < MAX_VERTEX_ATTRIBS);
3883
3884	mState.vertexAttribute[index].setCurrentValue(values);
3885
3886	mVertexDataManager->dirtyCurrentValue(index);
3887}
3888
3889void Context::setVertexAttrib(GLuint index, const GLuint *values)
3890{
3891	ASSERT(index < MAX_VERTEX_ATTRIBS);
3892
3893	mState.vertexAttribute[index].setCurrentValue(values);
3894
3895	mVertexDataManager->dirtyCurrentValue(index);
3896}
3897
3898void Context::blitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
3899                              GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
3900                              GLbitfield mask)
3901{
3902    Framebuffer *readFramebuffer = getReadFramebuffer();
3903    Framebuffer *drawFramebuffer = getDrawFramebuffer();
3904
3905	int readBufferWidth, readBufferHeight, readBufferSamples;
3906    int drawBufferWidth, drawBufferHeight, drawBufferSamples;
3907
3908    if(!readFramebuffer || readFramebuffer->completeness(readBufferWidth, readBufferHeight, readBufferSamples) != GL_FRAMEBUFFER_COMPLETE ||
3909       !drawFramebuffer || drawFramebuffer->completeness(drawBufferWidth, drawBufferHeight, drawBufferSamples) != GL_FRAMEBUFFER_COMPLETE)
3910    {
3911        return error(GL_INVALID_FRAMEBUFFER_OPERATION);
3912    }
3913
3914    if(drawBufferSamples > 1)
3915    {
3916        return error(GL_INVALID_OPERATION);
3917    }
3918
3919    sw::SliceRect sourceRect;
3920    sw::SliceRect destRect;
3921	bool flipX = (srcX0 < srcX1) ^ (dstX0 < dstX1);
3922	bool flipy = (srcY0 < srcY1) ^ (dstY0 < dstY1);
3923
3924    if(srcX0 < srcX1)
3925    {
3926        sourceRect.x0 = srcX0;
3927        sourceRect.x1 = srcX1;
3928    }
3929    else
3930    {
3931        sourceRect.x0 = srcX1;
3932        sourceRect.x1 = srcX0;
3933    }
3934
3935	if(dstX0 < dstX1)
3936	{
3937		destRect.x0 = dstX0;
3938		destRect.x1 = dstX1;
3939	}
3940	else
3941	{
3942		destRect.x0 = dstX1;
3943		destRect.x1 = dstX0;
3944	}
3945
3946    if(srcY0 < srcY1)
3947    {
3948        sourceRect.y0 = srcY0;
3949        sourceRect.y1 = srcY1;
3950    }
3951    else
3952    {
3953        sourceRect.y0 = srcY1;
3954        sourceRect.y1 = srcY0;
3955    }
3956
3957	if(dstY0 < dstY1)
3958	{
3959		destRect.y0 = dstY0;
3960		destRect.y1 = dstY1;
3961	}
3962	else
3963	{
3964		destRect.y0 = dstY1;
3965		destRect.y1 = dstY0;
3966	}
3967
3968	sw::Rect sourceScissoredRect = sourceRect;
3969    sw::Rect destScissoredRect = destRect;
3970
3971    if(mState.scissorTestEnabled)   // Only write to parts of the destination framebuffer which pass the scissor test
3972    {
3973        if(destRect.x0 < mState.scissorX)
3974        {
3975            int xDiff = mState.scissorX - destRect.x0;
3976            destScissoredRect.x0 = mState.scissorX;
3977            sourceScissoredRect.x0 += xDiff;
3978        }
3979
3980        if(destRect.x1 > mState.scissorX + mState.scissorWidth)
3981        {
3982            int xDiff = destRect.x1 - (mState.scissorX + mState.scissorWidth);
3983            destScissoredRect.x1 = mState.scissorX + mState.scissorWidth;
3984            sourceScissoredRect.x1 -= xDiff;
3985        }
3986
3987        if(destRect.y0 < mState.scissorY)
3988        {
3989            int yDiff = mState.scissorY - destRect.y0;
3990            destScissoredRect.y0 = mState.scissorY;
3991            sourceScissoredRect.y0 += yDiff;
3992        }
3993
3994        if(destRect.y1 > mState.scissorY + mState.scissorHeight)
3995        {
3996            int yDiff = destRect.y1 - (mState.scissorY + mState.scissorHeight);
3997            destScissoredRect.y1 = mState.scissorY + mState.scissorHeight;
3998            sourceScissoredRect.y1 -= yDiff;
3999        }
4000    }
4001
4002    sw::Rect sourceTrimmedRect = sourceScissoredRect;
4003    sw::Rect destTrimmedRect = destScissoredRect;
4004
4005    // The source & destination rectangles also may need to be trimmed if they fall out of the bounds of
4006    // the actual draw and read surfaces.
4007    if(sourceTrimmedRect.x0 < 0)
4008    {
4009        int xDiff = 0 - sourceTrimmedRect.x0;
4010        sourceTrimmedRect.x0 = 0;
4011        destTrimmedRect.x0 += xDiff;
4012    }
4013
4014    if(sourceTrimmedRect.x1 > readBufferWidth)
4015    {
4016        int xDiff = sourceTrimmedRect.x1 - readBufferWidth;
4017        sourceTrimmedRect.x1 = readBufferWidth;
4018        destTrimmedRect.x1 -= xDiff;
4019    }
4020
4021    if(sourceTrimmedRect.y0 < 0)
4022    {
4023        int yDiff = 0 - sourceTrimmedRect.y0;
4024        sourceTrimmedRect.y0 = 0;
4025        destTrimmedRect.y0 += yDiff;
4026    }
4027
4028    if(sourceTrimmedRect.y1 > readBufferHeight)
4029    {
4030        int yDiff = sourceTrimmedRect.y1 - readBufferHeight;
4031        sourceTrimmedRect.y1 = readBufferHeight;
4032        destTrimmedRect.y1 -= yDiff;
4033    }
4034
4035    if(destTrimmedRect.x0 < 0)
4036    {
4037        int xDiff = 0 - destTrimmedRect.x0;
4038        destTrimmedRect.x0 = 0;
4039        sourceTrimmedRect.x0 += xDiff;
4040    }
4041
4042    if(destTrimmedRect.x1 > drawBufferWidth)
4043    {
4044        int xDiff = destTrimmedRect.x1 - drawBufferWidth;
4045        destTrimmedRect.x1 = drawBufferWidth;
4046        sourceTrimmedRect.x1 -= xDiff;
4047    }
4048
4049    if(destTrimmedRect.y0 < 0)
4050    {
4051        int yDiff = 0 - destTrimmedRect.y0;
4052        destTrimmedRect.y0 = 0;
4053        sourceTrimmedRect.y0 += yDiff;
4054    }
4055
4056    if(destTrimmedRect.y1 > drawBufferHeight)
4057    {
4058        int yDiff = destTrimmedRect.y1 - drawBufferHeight;
4059        destTrimmedRect.y1 = drawBufferHeight;
4060        sourceTrimmedRect.y1 -= yDiff;
4061    }
4062
4063    bool partialBufferCopy = false;
4064
4065    if(sourceTrimmedRect.y1 - sourceTrimmedRect.y0 < readBufferHeight ||
4066       sourceTrimmedRect.x1 - sourceTrimmedRect.x0 < readBufferWidth ||
4067       destTrimmedRect.y1 - destTrimmedRect.y0 < drawBufferHeight ||
4068       destTrimmedRect.x1 - destTrimmedRect.x0 < drawBufferWidth ||
4069       sourceTrimmedRect.y0 != 0 || destTrimmedRect.y0 != 0 || sourceTrimmedRect.x0 != 0 || destTrimmedRect.x0 != 0)
4070    {
4071        partialBufferCopy = true;
4072    }
4073
4074	bool blitRenderTarget = false;
4075    bool blitDepthStencil = false;
4076
4077    if(mask & GL_COLOR_BUFFER_BIT)
4078    {
4079        const bool validReadType = readFramebuffer->getColorbufferType(getReadFramebufferColorIndex()) == GL_TEXTURE_2D ||
4080                                   readFramebuffer->getColorbufferType(getReadFramebufferColorIndex()) == GL_RENDERBUFFER;
4081        const bool validDrawType = drawFramebuffer->getColorbufferType(0) == GL_TEXTURE_2D ||
4082                                   drawFramebuffer->getColorbufferType(0) == GL_RENDERBUFFER;
4083        if(!validReadType || !validDrawType)
4084        {
4085            return error(GL_INVALID_OPERATION);
4086        }
4087
4088        if(partialBufferCopy && readBufferSamples > 1)
4089        {
4090            return error(GL_INVALID_OPERATION);
4091        }
4092
4093        blitRenderTarget = true;
4094    }
4095
4096    if(mask & (GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT))
4097    {
4098        Renderbuffer *readDSBuffer = NULL;
4099        Renderbuffer *drawDSBuffer = NULL;
4100
4101        // We support OES_packed_depth_stencil, and do not support a separately attached depth and stencil buffer, so if we have
4102        // both a depth and stencil buffer, it will be the same buffer.
4103
4104        if(mask & GL_DEPTH_BUFFER_BIT)
4105        {
4106            if(readFramebuffer->getDepthbuffer() && drawFramebuffer->getDepthbuffer())
4107            {
4108                if(readFramebuffer->getDepthbufferType() != drawFramebuffer->getDepthbufferType())
4109                {
4110                    return error(GL_INVALID_OPERATION);
4111                }
4112
4113                blitDepthStencil = true;
4114                readDSBuffer = readFramebuffer->getDepthbuffer();
4115                drawDSBuffer = drawFramebuffer->getDepthbuffer();
4116            }
4117        }
4118
4119        if(mask & GL_STENCIL_BUFFER_BIT)
4120        {
4121            if(readFramebuffer->getStencilbuffer() && drawFramebuffer->getStencilbuffer())
4122            {
4123                if(readFramebuffer->getStencilbufferType() != drawFramebuffer->getStencilbufferType())
4124                {
4125                    return error(GL_INVALID_OPERATION);
4126                }
4127
4128                blitDepthStencil = true;
4129                readDSBuffer = readFramebuffer->getStencilbuffer();
4130                drawDSBuffer = drawFramebuffer->getStencilbuffer();
4131            }
4132        }
4133
4134        if(partialBufferCopy)
4135        {
4136            ERR("Only whole-buffer depth and stencil blits are supported by this implementation.");
4137            return error(GL_INVALID_OPERATION);   // Only whole-buffer copies are permitted
4138        }
4139
4140        if((drawDSBuffer && drawDSBuffer->getSamples() > 1) ||
4141           (readDSBuffer && readDSBuffer->getSamples() > 1))
4142        {
4143            return error(GL_INVALID_OPERATION);
4144        }
4145    }
4146
4147    if(blitRenderTarget || blitDepthStencil)
4148    {
4149        if(blitRenderTarget)
4150        {
4151            egl::Image *readRenderTarget = readFramebuffer->getReadRenderTarget();
4152            egl::Image *drawRenderTarget = drawFramebuffer->getRenderTarget(0);
4153
4154			if(flipX)
4155			{
4156				swap(destRect.x0, destRect.x1);
4157			}
4158			if(flipy)
4159			{
4160				swap(destRect.y0, destRect.y1);
4161			}
4162
4163            bool success = device->stretchRect(readRenderTarget, &sourceRect, drawRenderTarget, &destRect, false);
4164
4165            readRenderTarget->release();
4166            drawRenderTarget->release();
4167
4168            if(!success)
4169            {
4170                ERR("BlitFramebuffer failed.");
4171                return;
4172            }
4173        }
4174
4175        if(blitDepthStencil)
4176        {
4177            bool success = device->stretchRect(readFramebuffer->getDepthStencil(), NULL, drawFramebuffer->getDepthStencil(), NULL, false);
4178
4179            if(!success)
4180            {
4181                ERR("BlitFramebuffer failed.");
4182                return;
4183            }
4184        }
4185    }
4186}
4187
4188void Context::bindTexImage(egl::Surface *surface)
4189{
4190	es2::Texture2D *textureObject = getTexture2D();
4191
4192    if(textureObject)
4193    {
4194		textureObject->bindTexImage(surface);
4195	}
4196}
4197
4198EGLenum Context::validateSharedImage(EGLenum target, GLuint name, GLuint textureLevel)
4199{
4200    GLenum textureTarget = GL_NONE;
4201
4202    switch(target)
4203    {
4204    case EGL_GL_TEXTURE_2D_KHR:
4205        textureTarget = GL_TEXTURE_2D;
4206        break;
4207    case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_X_KHR:
4208    case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_X_KHR:
4209    case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_Y_KHR:
4210    case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_KHR:
4211    case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_Z_KHR:
4212    case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_KHR:
4213        textureTarget = GL_TEXTURE_CUBE_MAP;
4214        break;
4215    case EGL_GL_RENDERBUFFER_KHR:
4216        break;
4217    default:
4218        return EGL_BAD_PARAMETER;
4219    }
4220
4221    if(textureLevel >= es2::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
4222    {
4223        return EGL_BAD_MATCH;
4224    }
4225
4226    if(textureTarget != GL_NONE)
4227    {
4228        es2::Texture *texture = getTexture(name);
4229
4230        if(!texture || texture->getTarget() != textureTarget)
4231        {
4232            return EGL_BAD_PARAMETER;
4233        }
4234
4235        if(texture->isShared(textureTarget, textureLevel))   // Bound to an EGLSurface or already an EGLImage sibling
4236        {
4237            return EGL_BAD_ACCESS;
4238        }
4239
4240        if(textureLevel != 0 && !texture->isSamplerComplete())
4241        {
4242            return EGL_BAD_PARAMETER;
4243        }
4244
4245        if(textureLevel == 0 && !(texture->isSamplerComplete() && texture->getLevelCount() == 1))
4246        {
4247            return EGL_BAD_PARAMETER;
4248        }
4249    }
4250    else if(target == EGL_GL_RENDERBUFFER_KHR)
4251    {
4252        es2::Renderbuffer *renderbuffer = getRenderbuffer(name);
4253
4254        if(!renderbuffer)
4255        {
4256            return EGL_BAD_PARAMETER;
4257        }
4258
4259        if(renderbuffer->isShared())   // Already an EGLImage sibling
4260        {
4261            return EGL_BAD_ACCESS;
4262        }
4263    }
4264    else UNREACHABLE(target);
4265
4266	return EGL_SUCCESS;
4267}
4268
4269egl::Image *Context::createSharedImage(EGLenum target, GLuint name, GLuint textureLevel)
4270{
4271	GLenum textureTarget = GL_NONE;
4272
4273    switch(target)
4274    {
4275    case EGL_GL_TEXTURE_2D_KHR:                  textureTarget = GL_TEXTURE_2D;                  break;
4276    case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_X_KHR: textureTarget = GL_TEXTURE_CUBE_MAP_POSITIVE_X; break;
4277    case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_X_KHR: textureTarget = GL_TEXTURE_CUBE_MAP_NEGATIVE_X; break;
4278    case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_Y_KHR: textureTarget = GL_TEXTURE_CUBE_MAP_POSITIVE_Y; break;
4279    case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_KHR: textureTarget = GL_TEXTURE_CUBE_MAP_NEGATIVE_Y; break;
4280    case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_Z_KHR: textureTarget = GL_TEXTURE_CUBE_MAP_POSITIVE_Z; break;
4281    case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_KHR: textureTarget = GL_TEXTURE_CUBE_MAP_NEGATIVE_Z; break;
4282    }
4283
4284    if(textureTarget != GL_NONE)
4285    {
4286        es2::Texture *texture = getTexture(name);
4287
4288        return texture->createSharedImage(textureTarget, textureLevel);
4289    }
4290    else if(target == EGL_GL_RENDERBUFFER_KHR)
4291    {
4292        es2::Renderbuffer *renderbuffer = getRenderbuffer(name);
4293
4294        return renderbuffer->createSharedImage();
4295    }
4296    else UNREACHABLE(target);
4297
4298	return 0;
4299}
4300
4301Device *Context::getDevice()
4302{
4303	return device;
4304}
4305
4306const GLubyte* Context::getExtensions(GLuint index, GLuint* numExt) const
4307{
4308	// Keep list sorted in following order:
4309	// OES extensions
4310	// EXT extensions
4311	// Vendor extensions
4312	static const GLubyte* extensions[] = {
4313		(const GLubyte*)"GL_OES_compressed_ETC1_RGB8_texture",
4314		(const GLubyte*)"GL_OES_depth24",
4315		(const GLubyte*)"GL_OES_depth32",
4316		(const GLubyte*)"GL_OES_depth_texture",
4317		(const GLubyte*)"GL_OES_depth_texture_cube_map",
4318		(const GLubyte*)"GL_OES_EGL_image",
4319		(const GLubyte*)"GL_OES_EGL_image_external",
4320		(const GLubyte*)"GL_OES_EGL_sync",
4321		(const GLubyte*)"GL_OES_element_index_uint",
4322		(const GLubyte*)"GL_OES_framebuffer_object",
4323		(const GLubyte*)"GL_OES_packed_depth_stencil",
4324		(const GLubyte*)"GL_OES_rgb8_rgba8",
4325		(const GLubyte*)"GL_OES_standard_derivatives",
4326		(const GLubyte*)"GL_OES_texture_float",
4327		(const GLubyte*)"GL_OES_texture_float_linear",
4328		(const GLubyte*)"GL_OES_texture_half_float",
4329		(const GLubyte*)"GL_OES_texture_half_float_linear",
4330		(const GLubyte*)"GL_OES_texture_npot",
4331		(const GLubyte*)"GL_OES_texture_3D",
4332		(const GLubyte*)"GL_EXT_blend_minmax",
4333		(const GLubyte*)"GL_EXT_color_buffer_half_float",
4334		(const GLubyte*)"GL_EXT_occlusion_query_boolean",
4335		(const GLubyte*)"GL_EXT_read_format_bgra",
4336#if (S3TC_SUPPORT)
4337		(const GLubyte*)"GL_EXT_texture_compression_dxt1",
4338#endif
4339		(const GLubyte*)"GL_EXT_texture_filter_anisotropic",
4340		(const GLubyte*)"GL_EXT_texture_format_BGRA8888",
4341		(const GLubyte*)"GL_ANGLE_framebuffer_blit",
4342		(const GLubyte*)"GL_NV_framebuffer_blit",
4343		(const GLubyte*)"GL_ANGLE_framebuffer_multisample",
4344#if (S3TC_SUPPORT)
4345		(const GLubyte*)"GL_ANGLE_texture_compression_dxt3",
4346		(const GLubyte*)"GL_ANGLE_texture_compression_dxt5",
4347#endif
4348		(const GLubyte*)"GL_NV_fence",
4349		(const GLubyte*)"GL_EXT_instanced_arrays",
4350		(const GLubyte*)"GL_ANGLE_instanced_arrays",
4351	};
4352	static const GLuint numExtensions = sizeof(extensions) / sizeof(*extensions);
4353
4354	if(numExt)
4355	{
4356		*numExt = numExtensions;
4357		return nullptr;
4358	}
4359
4360	if(index == GL_INVALID_INDEX)
4361	{
4362		static GLubyte* extensionsCat = nullptr;
4363		if((extensionsCat == nullptr) && (numExtensions > 0))
4364		{
4365			int totalLength = numExtensions; // 1 space between each extension name + terminating null
4366			for(unsigned int i = 0; i < numExtensions; i++)
4367			{
4368				totalLength += strlen(reinterpret_cast<const char*>(extensions[i]));
4369			}
4370			extensionsCat = new GLubyte[totalLength];
4371			extensionsCat[0] = '\0';
4372			for(unsigned int i = 0; i < numExtensions; i++)
4373			{
4374				if(i != 0)
4375				{
4376					strcat(reinterpret_cast<char*>(extensionsCat), " ");
4377				}
4378				strcat(reinterpret_cast<char*>(extensionsCat), reinterpret_cast<const char*>(extensions[i]));
4379			}
4380		}
4381		return extensionsCat;
4382	}
4383
4384	if(index >= numExtensions)
4385	{
4386		return nullptr;
4387	}
4388
4389	return extensions[index];
4390}
4391
4392}
4393
4394egl::Context *es2CreateContext(const egl::Config *config, const egl::Context *shareContext, int clientVersion)
4395{
4396	ASSERT(!shareContext || shareContext->getClientVersion() == clientVersion);   // Should be checked by eglCreateContext
4397	return new es2::Context(config, static_cast<const es2::Context*>(shareContext), clientVersion);
4398}
4399