Context.cpp revision 1b2f628aa9e22757fdbec6ea790149f6839c02f6 
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
40#undef near
41#undef far
42
43namespace es2
44{
45Context::Context(const egl::Config *config, const Context *shareContext, EGLint clientVersion)
46	: mConfig(config), clientVersion(clientVersion)
47{
48	sw::Context *context = new sw::Context();
49	device = new es2::Device(context);
50
51    mFenceNameSpace.setBaseHandle(0);
52
53    setClearColor(0.0f, 0.0f, 0.0f, 0.0f);
54
55    mState.depthClearValue = 1.0f;
56    mState.stencilClearValue = 0;
57
58    mState.cullFace = false;
59    mState.cullMode = GL_BACK;
60    mState.frontFace = GL_CCW;
61    mState.depthTest = false;
62    mState.depthFunc = GL_LESS;
63    mState.blend = false;
64    mState.sourceBlendRGB = GL_ONE;
65    mState.sourceBlendAlpha = GL_ONE;
66    mState.destBlendRGB = GL_ZERO;
67    mState.destBlendAlpha = GL_ZERO;
68    mState.blendEquationRGB = GL_FUNC_ADD;
69    mState.blendEquationAlpha = GL_FUNC_ADD;
70    mState.blendColor.red = 0;
71    mState.blendColor.green = 0;
72    mState.blendColor.blue = 0;
73    mState.blendColor.alpha = 0;
74    mState.stencilTest = false;
75    mState.stencilFunc = GL_ALWAYS;
76    mState.stencilRef = 0;
77    mState.stencilMask = -1;
78    mState.stencilWritemask = -1;
79    mState.stencilBackFunc = GL_ALWAYS;
80    mState.stencilBackRef = 0;
81    mState.stencilBackMask = - 1;
82    mState.stencilBackWritemask = -1;
83    mState.stencilFail = GL_KEEP;
84    mState.stencilPassDepthFail = GL_KEEP;
85    mState.stencilPassDepthPass = GL_KEEP;
86    mState.stencilBackFail = GL_KEEP;
87    mState.stencilBackPassDepthFail = GL_KEEP;
88    mState.stencilBackPassDepthPass = GL_KEEP;
89    mState.polygonOffsetFill = false;
90    mState.polygonOffsetFactor = 0.0f;
91    mState.polygonOffsetUnits = 0.0f;
92    mState.sampleAlphaToCoverage = false;
93    mState.sampleCoverage = false;
94    mState.sampleCoverageValue = 1.0f;
95    mState.sampleCoverageInvert = false;
96    mState.scissorTest = false;
97    mState.dither = true;
98    mState.primitiveRestartFixedIndex = false;
99    mState.rasterizerDiscard = false;
100    mState.generateMipmapHint = GL_DONT_CARE;
101    mState.fragmentShaderDerivativeHint = GL_DONT_CARE;
102
103    mState.lineWidth = 1.0f;
104
105    mState.viewportX = 0;
106    mState.viewportY = 0;
107    mState.viewportWidth = config->mDisplayMode.width;
108    mState.viewportHeight = config->mDisplayMode.height;
109    mState.zNear = 0.0f;
110    mState.zFar = 1.0f;
111
112    mState.scissorX = 0;
113    mState.scissorY = 0;
114    mState.scissorWidth = config->mDisplayMode.width;
115    mState.scissorHeight = config->mDisplayMode.height;
116
117    mState.colorMaskRed = true;
118    mState.colorMaskGreen = true;
119    mState.colorMaskBlue = true;
120    mState.colorMaskAlpha = true;
121    mState.depthMask = true;
122
123    if(shareContext != NULL)
124    {
125        mResourceManager = shareContext->mResourceManager;
126        mResourceManager->addRef();
127    }
128    else
129    {
130        mResourceManager = new ResourceManager();
131    }
132
133    // [OpenGL ES 2.0.24] section 3.7 page 83:
134    // In the initial state, TEXTURE_2D and TEXTURE_CUBE_MAP have twodimensional
135    // and cube map texture state vectors respectively associated with them.
136    // In order that access to these initial textures not be lost, they are treated as texture
137    // objects all of whose names are 0.
138
139    mTexture2DZero = new Texture2D(0);
140	mTexture3DZero = new Texture3D(0);
141    mTextureCubeMapZero = new TextureCubeMap(0);
142    mTextureExternalZero = new TextureExternal(0);
143
144    mState.activeSampler = 0;
145	bindVertexArray(0);
146    bindArrayBuffer(0);
147    bindElementArrayBuffer(0);
148    bindTextureCubeMap(0);
149    bindTexture2D(0);
150    bindReadFramebuffer(0);
151    bindDrawFramebuffer(0);
152    bindRenderbuffer(0);
153    bindTransformFeedback(0);
154
155	mState.readFramebufferColorIndex = 0;
156	for(int i = 0; i < MAX_COLOR_ATTACHMENTS; ++i)
157	{
158		mState.drawFramebufferColorIndices[i] = GL_NONE;
159	}
160
161    mState.currentProgram = 0;
162
163    mState.packAlignment = 4;
164    mState.unpackAlignment = 4;
165
166    mVertexDataManager = NULL;
167    mIndexDataManager = NULL;
168
169    mInvalidEnum = false;
170    mInvalidValue = false;
171    mInvalidOperation = false;
172    mOutOfMemory = false;
173    mInvalidFramebufferOperation = false;
174
175    mHasBeenCurrent = false;
176
177    markAllStateDirty();
178}
179
180Context::~Context()
181{
182	if(mState.currentProgram != 0)
183	{
184		Program *programObject = mResourceManager->getProgram(mState.currentProgram);
185		if(programObject)
186		{
187			programObject->release();
188		}
189		mState.currentProgram = 0;
190	}
191
192	while(!mFramebufferMap.empty())
193	{
194		deleteFramebuffer(mFramebufferMap.begin()->first);
195	}
196
197	while(!mFenceMap.empty())
198	{
199		deleteFence(mFenceMap.begin()->first);
200	}
201
202	while(!mQueryMap.empty())
203	{
204		deleteQuery(mQueryMap.begin()->first);
205	}
206
207	while(!mVertexArrayMap.empty())
208	{
209		deleteVertexArray(mVertexArrayMap.begin()->first);
210	}
211
212	while(!mTransformFeedbackMap.empty())
213	{
214		deleteTransformFeedback(mTransformFeedbackMap.begin()->first);
215	}
216
217	while(!mSamplerMap.empty())
218	{
219		deleteSampler(mSamplerMap.begin()->first);
220	}
221
222	for(int type = 0; type < TEXTURE_TYPE_COUNT; type++)
223	{
224		for(int sampler = 0; sampler < MAX_COMBINED_TEXTURE_IMAGE_UNITS; sampler++)
225		{
226			mState.samplerTexture[type][sampler] = NULL;
227		}
228	}
229
230	for(int i = 0; i < MAX_VERTEX_ATTRIBS; i++)
231	{
232		mState.vertexAttribute[i].mBoundBuffer = NULL;
233	}
234
235	for(int i = 0; i < QUERY_TYPE_COUNT; i++)
236	{
237		mState.activeQuery[i] = NULL;
238	}
239
240	mState.arrayBuffer = NULL;
241	mState.copyReadBuffer = NULL;
242	mState.copyWriteBuffer = NULL;
243	mState.pixelPackBuffer = NULL;
244	mState.pixelUnpackBuffer = NULL;
245	mState.uniformBuffer = NULL;
246	mState.renderbuffer = NULL;
247
248	for(int i = 0; i < MAX_COMBINED_TEXTURE_IMAGE_UNITS; ++i)
249	{
250		mState.sampler[i] = NULL;
251	}
252
253    mTexture2DZero = NULL;
254	mTexture3DZero = NULL;
255    mTextureCubeMapZero = NULL;
256    mTextureExternalZero = NULL;
257
258    delete mVertexDataManager;
259    delete mIndexDataManager;
260
261    mResourceManager->release();
262	delete device;
263}
264
265void Context::makeCurrent(egl::Surface *surface)
266{
267    if(!mHasBeenCurrent)
268    {
269        mVertexDataManager = new VertexDataManager(this);
270        mIndexDataManager = new IndexDataManager();
271
272        mState.viewportX = 0;
273        mState.viewportY = 0;
274        mState.viewportWidth = surface->getWidth();
275        mState.viewportHeight = surface->getHeight();
276
277        mState.scissorX = 0;
278        mState.scissorY = 0;
279        mState.scissorWidth = surface->getWidth();
280        mState.scissorHeight = surface->getHeight();
281
282        mHasBeenCurrent = true;
283    }
284
285    // Wrap the existing resources into GL objects and assign them to the '0' names
286    egl::Image *defaultRenderTarget = surface->getRenderTarget();
287    egl::Image *depthStencil = surface->getDepthStencil();
288
289    Colorbuffer *colorbufferZero = new Colorbuffer(defaultRenderTarget);
290    DepthStencilbuffer *depthStencilbufferZero = new DepthStencilbuffer(depthStencil);
291    Framebuffer *framebufferZero = new DefaultFramebuffer(colorbufferZero, depthStencilbufferZero);
292
293    setFramebufferZero(framebufferZero);
294
295    if(defaultRenderTarget)
296    {
297        defaultRenderTarget->release();
298    }
299
300    if(depthStencil)
301    {
302        depthStencil->release();
303    }
304
305    markAllStateDirty();
306}
307
308EGLint Context::getClientVersion() const
309{
310	return clientVersion;
311}
312
313// This function will set all of the state-related dirty flags, so that all state is set during next pre-draw.
314void Context::markAllStateDirty()
315{
316    mAppliedProgramSerial = 0;
317
318    mDepthStateDirty = true;
319    mMaskStateDirty = true;
320    mBlendStateDirty = true;
321    mStencilStateDirty = true;
322    mPolygonOffsetStateDirty = true;
323    mSampleStateDirty = true;
324    mDitherStateDirty = true;
325    mFrontFaceDirty = true;
326}
327
328void Context::setClearColor(float red, float green, float blue, float alpha)
329{
330    mState.colorClearValue.red = red;
331    mState.colorClearValue.green = green;
332    mState.colorClearValue.blue = blue;
333    mState.colorClearValue.alpha = alpha;
334}
335
336void Context::setClearDepth(float depth)
337{
338    mState.depthClearValue = depth;
339}
340
341void Context::setClearStencil(int stencil)
342{
343    mState.stencilClearValue = stencil;
344}
345
346void Context::setCullFace(bool enabled)
347{
348    mState.cullFace = enabled;
349}
350
351bool Context::isCullFaceEnabled() const
352{
353    return mState.cullFace;
354}
355
356void Context::setCullMode(GLenum mode)
357{
358   mState.cullMode = mode;
359}
360
361void Context::setFrontFace(GLenum front)
362{
363    if(mState.frontFace != front)
364    {
365        mState.frontFace = front;
366        mFrontFaceDirty = true;
367    }
368}
369
370void Context::setDepthTest(bool enabled)
371{
372    if(mState.depthTest != enabled)
373    {
374        mState.depthTest = enabled;
375        mDepthStateDirty = true;
376    }
377}
378
379bool Context::isDepthTestEnabled() const
380{
381    return mState.depthTest;
382}
383
384void Context::setDepthFunc(GLenum depthFunc)
385{
386    if(mState.depthFunc != depthFunc)
387    {
388        mState.depthFunc = depthFunc;
389        mDepthStateDirty = true;
390    }
391}
392
393void Context::setDepthRange(float zNear, float zFar)
394{
395    mState.zNear = zNear;
396    mState.zFar = zFar;
397}
398
399void Context::setBlend(bool enabled)
400{
401    if(mState.blend != enabled)
402    {
403        mState.blend = enabled;
404        mBlendStateDirty = true;
405    }
406}
407
408bool Context::isBlendEnabled() const
409{
410    return mState.blend;
411}
412
413void Context::setBlendFactors(GLenum sourceRGB, GLenum destRGB, GLenum sourceAlpha, GLenum destAlpha)
414{
415    if(mState.sourceBlendRGB != sourceRGB ||
416       mState.sourceBlendAlpha != sourceAlpha ||
417       mState.destBlendRGB != destRGB ||
418       mState.destBlendAlpha != destAlpha)
419    {
420        mState.sourceBlendRGB = sourceRGB;
421        mState.destBlendRGB = destRGB;
422        mState.sourceBlendAlpha = sourceAlpha;
423        mState.destBlendAlpha = destAlpha;
424        mBlendStateDirty = true;
425    }
426}
427
428void Context::setBlendColor(float red, float green, float blue, float alpha)
429{
430    if(mState.blendColor.red != red ||
431       mState.blendColor.green != green ||
432       mState.blendColor.blue != blue ||
433       mState.blendColor.alpha != alpha)
434    {
435        mState.blendColor.red = red;
436        mState.blendColor.green = green;
437        mState.blendColor.blue = blue;
438        mState.blendColor.alpha = alpha;
439        mBlendStateDirty = true;
440    }
441}
442
443void Context::setBlendEquation(GLenum rgbEquation, GLenum alphaEquation)
444{
445    if(mState.blendEquationRGB != rgbEquation ||
446       mState.blendEquationAlpha != alphaEquation)
447    {
448        mState.blendEquationRGB = rgbEquation;
449        mState.blendEquationAlpha = alphaEquation;
450        mBlendStateDirty = true;
451    }
452}
453
454void Context::setStencilTest(bool enabled)
455{
456    if(mState.stencilTest != enabled)
457    {
458        mState.stencilTest = enabled;
459        mStencilStateDirty = true;
460    }
461}
462
463bool Context::isStencilTestEnabled() const
464{
465    return mState.stencilTest;
466}
467
468void Context::setStencilParams(GLenum stencilFunc, GLint stencilRef, GLuint stencilMask)
469{
470    if(mState.stencilFunc != stencilFunc ||
471        mState.stencilRef != stencilRef ||
472        mState.stencilMask != stencilMask)
473    {
474        mState.stencilFunc = stencilFunc;
475        mState.stencilRef = (stencilRef > 0) ? stencilRef : 0;
476        mState.stencilMask = stencilMask;
477        mStencilStateDirty = true;
478    }
479}
480
481void Context::setStencilBackParams(GLenum stencilBackFunc, GLint stencilBackRef, GLuint stencilBackMask)
482{
483    if(mState.stencilBackFunc != stencilBackFunc ||
484        mState.stencilBackRef != stencilBackRef ||
485        mState.stencilBackMask != stencilBackMask)
486    {
487        mState.stencilBackFunc = stencilBackFunc;
488        mState.stencilBackRef = (stencilBackRef > 0) ? stencilBackRef : 0;
489        mState.stencilBackMask = stencilBackMask;
490        mStencilStateDirty = true;
491    }
492}
493
494void Context::setStencilWritemask(GLuint stencilWritemask)
495{
496    if(mState.stencilWritemask != stencilWritemask)
497    {
498        mState.stencilWritemask = stencilWritemask;
499        mStencilStateDirty = true;
500    }
501}
502
503void Context::setStencilBackWritemask(GLuint stencilBackWritemask)
504{
505    if(mState.stencilBackWritemask != stencilBackWritemask)
506    {
507        mState.stencilBackWritemask = stencilBackWritemask;
508        mStencilStateDirty = true;
509    }
510}
511
512void Context::setStencilOperations(GLenum stencilFail, GLenum stencilPassDepthFail, GLenum stencilPassDepthPass)
513{
514    if(mState.stencilFail != stencilFail ||
515        mState.stencilPassDepthFail != stencilPassDepthFail ||
516        mState.stencilPassDepthPass != stencilPassDepthPass)
517    {
518        mState.stencilFail = stencilFail;
519        mState.stencilPassDepthFail = stencilPassDepthFail;
520        mState.stencilPassDepthPass = stencilPassDepthPass;
521        mStencilStateDirty = true;
522    }
523}
524
525void Context::setStencilBackOperations(GLenum stencilBackFail, GLenum stencilBackPassDepthFail, GLenum stencilBackPassDepthPass)
526{
527    if(mState.stencilBackFail != stencilBackFail ||
528        mState.stencilBackPassDepthFail != stencilBackPassDepthFail ||
529        mState.stencilBackPassDepthPass != stencilBackPassDepthPass)
530    {
531        mState.stencilBackFail = stencilBackFail;
532        mState.stencilBackPassDepthFail = stencilBackPassDepthFail;
533        mState.stencilBackPassDepthPass = stencilBackPassDepthPass;
534        mStencilStateDirty = true;
535    }
536}
537
538void Context::setPolygonOffsetFill(bool enabled)
539{
540    if(mState.polygonOffsetFill != enabled)
541    {
542        mState.polygonOffsetFill = enabled;
543        mPolygonOffsetStateDirty = true;
544    }
545}
546
547bool Context::isPolygonOffsetFillEnabled() const
548{
549    return mState.polygonOffsetFill;
550}
551
552void Context::setPolygonOffsetParams(GLfloat factor, GLfloat units)
553{
554    if(mState.polygonOffsetFactor != factor ||
555        mState.polygonOffsetUnits != units)
556    {
557        mState.polygonOffsetFactor = factor;
558        mState.polygonOffsetUnits = units;
559        mPolygonOffsetStateDirty = true;
560    }
561}
562
563void Context::setSampleAlphaToCoverage(bool enabled)
564{
565    if(mState.sampleAlphaToCoverage != enabled)
566    {
567        mState.sampleAlphaToCoverage = enabled;
568        mSampleStateDirty = true;
569    }
570}
571
572bool Context::isSampleAlphaToCoverageEnabled() const
573{
574    return mState.sampleAlphaToCoverage;
575}
576
577void Context::setSampleCoverage(bool enabled)
578{
579    if(mState.sampleCoverage != enabled)
580    {
581        mState.sampleCoverage = enabled;
582        mSampleStateDirty = true;
583    }
584}
585
586bool Context::isSampleCoverageEnabled() const
587{
588    return mState.sampleCoverage;
589}
590
591void Context::setSampleCoverageParams(GLclampf value, bool invert)
592{
593    if(mState.sampleCoverageValue != value ||
594        mState.sampleCoverageInvert != invert)
595    {
596        mState.sampleCoverageValue = value;
597        mState.sampleCoverageInvert = invert;
598        mSampleStateDirty = true;
599    }
600}
601
602void Context::setScissorTest(bool enabled)
603{
604    mState.scissorTest = enabled;
605}
606
607bool Context::isScissorTestEnabled() const
608{
609    return mState.scissorTest;
610}
611
612void Context::setDither(bool enabled)
613{
614    if(mState.dither != enabled)
615    {
616        mState.dither = enabled;
617        mDitherStateDirty = true;
618    }
619}
620
621bool Context::isDitherEnabled() const
622{
623    return mState.dither;
624}
625
626void Context::setPrimitiveRestartFixedIndex(bool enabled)
627{
628    UNIMPLEMENTED();
629    mState.primitiveRestartFixedIndex = enabled;
630}
631
632bool Context::isPrimitiveRestartFixedIndexEnabled() const
633{
634    return mState.primitiveRestartFixedIndex;
635}
636
637void Context::setRasterizerDiscard(bool enabled)
638{
639    UNIMPLEMENTED();
640    mState.rasterizerDiscard = enabled;
641}
642
643bool Context::isRasterizerDiscardEnabled() const
644{
645    return mState.rasterizerDiscard;
646}
647
648void Context::setLineWidth(GLfloat width)
649{
650    mState.lineWidth = width;
651	device->setLineWidth(clamp(width, ALIASED_LINE_WIDTH_RANGE_MIN, ALIASED_LINE_WIDTH_RANGE_MAX));
652}
653
654void Context::setGenerateMipmapHint(GLenum hint)
655{
656    mState.generateMipmapHint = hint;
657}
658
659void Context::setFragmentShaderDerivativeHint(GLenum hint)
660{
661    mState.fragmentShaderDerivativeHint = hint;
662    // TODO: Propagate the hint to shader translator so we can write
663    // ddx, ddx_coarse, or ddx_fine depending on the hint.
664    // Ignore for now. It is valid for implementations to ignore hint.
665}
666
667void Context::setViewportParams(GLint x, GLint y, GLsizei width, GLsizei height)
668{
669    mState.viewportX = x;
670    mState.viewportY = y;
671    mState.viewportWidth = width;
672    mState.viewportHeight = height;
673}
674
675void Context::setScissorParams(GLint x, GLint y, GLsizei width, GLsizei height)
676{
677    mState.scissorX = x;
678    mState.scissorY = y;
679    mState.scissorWidth = width;
680    mState.scissorHeight = height;
681}
682
683void Context::setColorMask(bool red, bool green, bool blue, bool alpha)
684{
685    if(mState.colorMaskRed != red || mState.colorMaskGreen != green ||
686       mState.colorMaskBlue != blue || mState.colorMaskAlpha != alpha)
687    {
688        mState.colorMaskRed = red;
689        mState.colorMaskGreen = green;
690        mState.colorMaskBlue = blue;
691        mState.colorMaskAlpha = alpha;
692        mMaskStateDirty = true;
693    }
694}
695
696void Context::setDepthMask(bool mask)
697{
698    if(mState.depthMask != mask)
699    {
700        mState.depthMask = mask;
701        mMaskStateDirty = true;
702    }
703}
704
705void Context::setActiveSampler(unsigned int active)
706{
707    mState.activeSampler = active;
708}
709
710GLuint Context::getReadFramebufferName() const
711{
712    return mState.readFramebuffer;
713}
714
715GLuint Context::getDrawFramebufferName() const
716{
717    return mState.drawFramebuffer;
718}
719
720GLuint Context::getRenderbufferName() const
721{
722    return mState.renderbuffer.name();
723}
724
725void Context::setReadFramebufferColorIndex(GLuint index)
726{
727	mState.readFramebufferColorIndex = index;
728}
729
730void Context::setDrawFramebufferColorIndices(GLsizei n, const GLenum *bufs)
731{
732	for(int i = 0; i < n; ++i)
733	{
734		mState.drawFramebufferColorIndices[i] = ((bufs[i] == GL_BACK) || (bufs[i] == GL_NONE)) ? bufs[i] : i;
735	}
736}
737
738GLuint Context::getReadFramebufferColorIndex() const
739{
740	return mState.readFramebufferColorIndex;
741}
742
743GLuint Context::getArrayBufferName() const
744{
745    return mState.arrayBuffer.name();
746}
747
748GLuint Context::getElementArrayBufferName() const
749{
750	Buffer* elementArrayBuffer = getCurrentVertexArray()->getElementArrayBuffer();
751	return elementArrayBuffer ? elementArrayBuffer->name : 0;
752}
753
754GLuint Context::getActiveQuery(GLenum target) const
755{
756    Query *queryObject = NULL;
757
758    switch(target)
759    {
760    case GL_ANY_SAMPLES_PASSED_EXT:
761        queryObject = mState.activeQuery[QUERY_ANY_SAMPLES_PASSED];
762        break;
763    case GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT:
764        queryObject = mState.activeQuery[QUERY_ANY_SAMPLES_PASSED_CONSERVATIVE];
765        break;
766    case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
767        queryObject = mState.activeQuery[QUERY_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN];
768        break;
769    default:
770        ASSERT(false);
771    }
772
773    if(queryObject)
774    {
775        return queryObject->name;
776    }
777
778	return 0;
779}
780
781void Context::setEnableVertexAttribArray(unsigned int attribNum, bool enabled)
782{
783	getCurrentVertexArray()->enableAttribute(attribNum, enabled);
784}
785
786void Context::setVertexAttribDivisor(unsigned int attribNum, GLuint divisor)
787{
788	getCurrentVertexArray()->setVertexAttribDivisor(attribNum, divisor);
789}
790
791const VertexAttribute &Context::getVertexAttribState(unsigned int attribNum) const
792{
793	return getCurrentVertexArray()->getVertexAttribute(attribNum);
794}
795
796void Context::setVertexAttribState(unsigned int attribNum, Buffer *boundBuffer, GLint size, GLenum type, bool normalized,
797                                   GLsizei stride, const void *pointer)
798{
799	getCurrentVertexArray()->setAttributeState(attribNum, boundBuffer, size, type, normalized, stride, pointer);
800}
801
802const void *Context::getVertexAttribPointer(unsigned int attribNum) const
803{
804	return getCurrentVertexArray()->getVertexAttribute(attribNum).mPointer;
805}
806
807const VertexAttributeArray &Context::getVertexArrayAttributes()
808{
809	return getCurrentVertexArray()->getVertexAttributes();
810}
811
812const VertexAttributeArray &Context::getCurrentVertexAttributes()
813{
814	return mState.vertexAttribute;
815}
816
817void Context::setPackAlignment(GLint alignment)
818{
819    mState.packAlignment = alignment;
820}
821
822GLint Context::getPackAlignment() const
823{
824    return mState.packAlignment;
825}
826
827void Context::setUnpackAlignment(GLint alignment)
828{
829    mState.unpackAlignment = alignment;
830}
831
832GLint Context::getUnpackAlignment() const
833{
834    return mState.unpackAlignment;
835}
836
837GLuint Context::createBuffer()
838{
839    return mResourceManager->createBuffer();
840}
841
842GLuint Context::createProgram()
843{
844    return mResourceManager->createProgram();
845}
846
847GLuint Context::createShader(GLenum type)
848{
849    return mResourceManager->createShader(type);
850}
851
852GLuint Context::createTexture()
853{
854    return mResourceManager->createTexture();
855}
856
857GLuint Context::createRenderbuffer()
858{
859    return mResourceManager->createRenderbuffer();
860}
861
862// Returns an unused framebuffer name
863GLuint Context::createFramebuffer()
864{
865    GLuint handle = mFramebufferNameSpace.allocate();
866
867    mFramebufferMap[handle] = NULL;
868
869    return handle;
870}
871
872GLuint Context::createFence()
873{
874    GLuint handle = mFenceNameSpace.allocate();
875
876    mFenceMap[handle] = new Fence;
877
878    return handle;
879}
880
881// Returns an unused query name
882GLuint Context::createQuery()
883{
884    GLuint handle = mQueryNameSpace.allocate();
885
886    mQueryMap[handle] = NULL;
887
888    return handle;
889}
890
891// Returns an unused vertex array name
892GLuint Context::createVertexArray()
893{
894	GLuint handle = mVertexArrayNameSpace.allocate();
895
896	mVertexArrayMap[handle] = NULL;
897
898	return handle;
899}
900
901// Returns an unused transform feedback name
902GLuint Context::createTransformFeedback()
903{
904	GLuint handle = mTransformFeedbackNameSpace.allocate();
905
906	mTransformFeedbackMap[handle] = NULL;
907
908	return handle;
909}
910
911// Returns an unused sampler name
912GLuint Context::createSampler()
913{
914	GLuint handle = mSamplerNameSpace.allocate();
915
916	mSamplerMap[handle] = NULL;
917
918	return handle;
919}
920
921void Context::deleteBuffer(GLuint buffer)
922{
923    if(mResourceManager->getBuffer(buffer))
924    {
925        detachBuffer(buffer);
926    }
927
928    mResourceManager->deleteBuffer(buffer);
929}
930
931void Context::deleteShader(GLuint shader)
932{
933    mResourceManager->deleteShader(shader);
934}
935
936void Context::deleteProgram(GLuint program)
937{
938    mResourceManager->deleteProgram(program);
939}
940
941void Context::deleteTexture(GLuint texture)
942{
943    if(mResourceManager->getTexture(texture))
944    {
945        detachTexture(texture);
946    }
947
948    mResourceManager->deleteTexture(texture);
949}
950
951void Context::deleteRenderbuffer(GLuint renderbuffer)
952{
953    if(mResourceManager->getRenderbuffer(renderbuffer))
954    {
955        detachRenderbuffer(renderbuffer);
956    }
957
958    mResourceManager->deleteRenderbuffer(renderbuffer);
959}
960
961void Context::deleteFramebuffer(GLuint framebuffer)
962{
963    FramebufferMap::iterator framebufferObject = mFramebufferMap.find(framebuffer);
964
965    if(framebufferObject != mFramebufferMap.end())
966    {
967        detachFramebuffer(framebuffer);
968
969        mFramebufferNameSpace.release(framebufferObject->first);
970        delete framebufferObject->second;
971        mFramebufferMap.erase(framebufferObject);
972    }
973}
974
975void Context::deleteFence(GLuint fence)
976{
977    FenceMap::iterator fenceObject = mFenceMap.find(fence);
978
979    if(fenceObject != mFenceMap.end())
980    {
981        mFenceNameSpace.release(fenceObject->first);
982        delete fenceObject->second;
983        mFenceMap.erase(fenceObject);
984    }
985}
986
987void Context::deleteQuery(GLuint query)
988{
989    QueryMap::iterator queryObject = mQueryMap.find(query);
990
991	if(queryObject != mQueryMap.end())
992    {
993        mQueryNameSpace.release(queryObject->first);
994
995		if(queryObject->second)
996        {
997            queryObject->second->release();
998        }
999
1000		mQueryMap.erase(queryObject);
1001    }
1002}
1003
1004void Context::deleteVertexArray(GLuint vertexArray)
1005{
1006	VertexArrayMap::iterator vertexArrayObject = mVertexArrayMap.find(vertexArray);
1007
1008	if(vertexArrayObject != mVertexArrayMap.end())
1009	{
1010		// Vertex array detachment is handled by Context, because 0 is a valid
1011		// VAO, and a pointer to it must be passed from Context to State at
1012		// binding time.
1013
1014		// [OpenGL ES 3.0.2] section 2.10 page 43:
1015		// If a vertex array object that is currently bound is deleted, the binding
1016		// for that object reverts to zero and the default vertex array becomes current.
1017		if(getCurrentVertexArray()->name == vertexArray)
1018		{
1019			bindVertexArray(0);
1020		}
1021
1022		mVertexArrayNameSpace.release(vertexArrayObject->first);
1023		delete vertexArrayObject->second;
1024		mVertexArrayMap.erase(vertexArrayObject);
1025	}
1026}
1027
1028void Context::deleteTransformFeedback(GLuint transformFeedback)
1029{
1030	TransformFeedbackMap::iterator transformFeedbackObject = mTransformFeedbackMap.find(transformFeedback);
1031
1032	if(transformFeedbackObject != mTransformFeedbackMap.end())
1033	{
1034		mTransformFeedbackNameSpace.release(transformFeedbackObject->first);
1035		delete transformFeedbackObject->second;
1036		mTransformFeedbackMap.erase(transformFeedbackObject);
1037	}
1038}
1039
1040void Context::deleteSampler(GLuint sampler)
1041{
1042	SamplerMap::iterator samplerObject = mSamplerMap.find(sampler);
1043
1044	if(samplerObject != mSamplerMap.end())
1045	{
1046		mSamplerNameSpace.release(samplerObject->first);
1047
1048		if(samplerObject->second)
1049		{
1050			samplerObject->second->release();
1051		}
1052
1053		mSamplerMap.erase(samplerObject);
1054	}
1055}
1056
1057Buffer *Context::getBuffer(GLuint handle) const
1058{
1059    return mResourceManager->getBuffer(handle);
1060}
1061
1062Shader *Context::getShader(GLuint handle) const
1063{
1064    return mResourceManager->getShader(handle);
1065}
1066
1067Program *Context::getProgram(GLuint handle) const
1068{
1069    return mResourceManager->getProgram(handle);
1070}
1071
1072Texture *Context::getTexture(GLuint handle) const
1073{
1074    return mResourceManager->getTexture(handle);
1075}
1076
1077Renderbuffer *Context::getRenderbuffer(GLuint handle) const
1078{
1079    return mResourceManager->getRenderbuffer(handle);
1080}
1081
1082Framebuffer *Context::getReadFramebuffer() const
1083{
1084    return getFramebuffer(mState.readFramebuffer);
1085}
1086
1087Framebuffer *Context::getDrawFramebuffer() const
1088{
1089    return getFramebuffer(mState.drawFramebuffer);
1090}
1091
1092void Context::bindArrayBuffer(unsigned int buffer)
1093{
1094    mResourceManager->checkBufferAllocation(buffer);
1095
1096    mState.arrayBuffer = getBuffer(buffer);
1097}
1098
1099void Context::bindElementArrayBuffer(unsigned int buffer)
1100{
1101    mResourceManager->checkBufferAllocation(buffer);
1102
1103	getCurrentVertexArray()->setElementArrayBuffer(getBuffer(buffer));
1104}
1105
1106void Context::bindCopyReadBuffer(GLuint buffer)
1107{
1108	mResourceManager->checkBufferAllocation(buffer);
1109
1110	mState.copyReadBuffer = getBuffer(buffer);
1111}
1112
1113void Context::bindCopyWriteBuffer(GLuint buffer)
1114{
1115	mResourceManager->checkBufferAllocation(buffer);
1116
1117	mState.copyWriteBuffer = getBuffer(buffer);
1118}
1119
1120void Context::bindPixelPackBuffer(GLuint buffer)
1121{
1122	mResourceManager->checkBufferAllocation(buffer);
1123
1124	mState.pixelPackBuffer = getBuffer(buffer);
1125}
1126
1127void Context::bindPixelUnpackBuffer(GLuint buffer)
1128{
1129	mResourceManager->checkBufferAllocation(buffer);
1130
1131	mState.pixelUnpackBuffer = getBuffer(buffer);
1132}
1133
1134void Context::bindTransformFeedbackBuffer(GLuint buffer)
1135{
1136	mResourceManager->checkBufferAllocation(buffer);
1137
1138	TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
1139
1140	if(transformFeedback)
1141	{
1142		transformFeedback->setGenericBuffer(getBuffer(buffer));
1143	}
1144}
1145
1146void Context::bindUniformBuffer(GLuint buffer)
1147{
1148	mResourceManager->checkBufferAllocation(buffer);
1149
1150	mState.uniformBuffer = getBuffer(buffer);
1151}
1152
1153void Context::bindTexture2D(GLuint texture)
1154{
1155    mResourceManager->checkTextureAllocation(texture, TEXTURE_2D);
1156
1157    mState.samplerTexture[TEXTURE_2D][mState.activeSampler] = getTexture(texture);
1158}
1159
1160void Context::bindTextureCubeMap(GLuint texture)
1161{
1162    mResourceManager->checkTextureAllocation(texture, TEXTURE_CUBE);
1163
1164    mState.samplerTexture[TEXTURE_CUBE][mState.activeSampler] = getTexture(texture);
1165}
1166
1167void Context::bindTextureExternal(GLuint texture)
1168{
1169    mResourceManager->checkTextureAllocation(texture, TEXTURE_EXTERNAL);
1170
1171    mState.samplerTexture[TEXTURE_EXTERNAL][mState.activeSampler] = getTexture(texture);
1172}
1173
1174void Context::bindTexture3D(GLuint texture)
1175{
1176	mResourceManager->checkTextureAllocation(texture, TEXTURE_3D);
1177
1178	mState.samplerTexture[TEXTURE_3D][mState.activeSampler] = getTexture(texture);
1179}
1180
1181void Context::bindReadFramebuffer(GLuint framebuffer)
1182{
1183    if(!getFramebuffer(framebuffer))
1184    {
1185        mFramebufferMap[framebuffer] = new Framebuffer();
1186    }
1187
1188    mState.readFramebuffer = framebuffer;
1189}
1190
1191void Context::bindDrawFramebuffer(GLuint framebuffer)
1192{
1193    if(!getFramebuffer(framebuffer))
1194    {
1195        mFramebufferMap[framebuffer] = new Framebuffer();
1196    }
1197
1198    mState.drawFramebuffer = framebuffer;
1199}
1200
1201void Context::bindRenderbuffer(GLuint renderbuffer)
1202{
1203    mState.renderbuffer = getRenderbuffer(renderbuffer);
1204}
1205
1206bool Context::bindVertexArray(GLuint array)
1207{
1208	VertexArray* vertexArray = getVertexArray(array);
1209
1210	if(!vertexArray)
1211	{
1212		vertexArray = new VertexArray(array);
1213		mVertexArrayMap[array] = vertexArray;
1214	}
1215
1216	mState.vertexArray = array;
1217
1218	return !!vertexArray;
1219}
1220
1221bool Context::bindTransformFeedback(GLuint id)
1222{
1223	if(!getTransformFeedback(id))
1224	{
1225		mTransformFeedbackMap[id] = new TransformFeedback(id);
1226	}
1227
1228	mState.transformFeedback = id;
1229
1230	return true;
1231}
1232
1233bool Context::bindSampler(GLuint unit, GLuint sampler)
1234{
1235	Sampler* samplerObject = getSampler(sampler);
1236
1237	if(sampler)
1238	{
1239		mState.sampler[unit] = samplerObject;
1240	}
1241
1242	return !!samplerObject;
1243}
1244
1245void Context::useProgram(GLuint program)
1246{
1247    GLuint priorProgram = mState.currentProgram;
1248    mState.currentProgram = program;               // Must switch before trying to delete, otherwise it only gets flagged.
1249
1250    if(priorProgram != program)
1251    {
1252        Program *newProgram = mResourceManager->getProgram(program);
1253        Program *oldProgram = mResourceManager->getProgram(priorProgram);
1254
1255        if(newProgram)
1256        {
1257            newProgram->addRef();
1258        }
1259
1260        if(oldProgram)
1261        {
1262            oldProgram->release();
1263        }
1264    }
1265}
1266
1267void Context::beginQuery(GLenum target, GLuint query)
1268{
1269    // From EXT_occlusion_query_boolean: If BeginQueryEXT is called with an <id>
1270    // of zero, if the active query object name for <target> is non-zero (for the
1271    // targets ANY_SAMPLES_PASSED_EXT and ANY_SAMPLES_PASSED_CONSERVATIVE_EXT, if
1272    // the active query for either target is non-zero), if <id> is the name of an
1273    // existing query object whose type does not match <target>, or if <id> is the
1274    // active query object name for any query type, the error INVALID_OPERATION is
1275    // generated.
1276
1277    // Ensure no other queries are active
1278    // NOTE: If other queries than occlusion are supported, we will need to check
1279    // separately that:
1280    //    a) The query ID passed is not the current active query for any target/type
1281    //    b) There are no active queries for the requested target (and in the case
1282    //       of GL_ANY_SAMPLES_PASSED_EXT and GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT,
1283    //       no query may be active for either if glBeginQuery targets either.
1284    for(int i = 0; i < QUERY_TYPE_COUNT; i++)
1285    {
1286        if(mState.activeQuery[i] != NULL)
1287        {
1288            return error(GL_INVALID_OPERATION);
1289        }
1290    }
1291
1292    QueryType qType;
1293    switch(target)
1294    {
1295    case GL_ANY_SAMPLES_PASSED_EXT:
1296        qType = QUERY_ANY_SAMPLES_PASSED;
1297        break;
1298    case GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT:
1299        qType = QUERY_ANY_SAMPLES_PASSED_CONSERVATIVE;
1300        break;
1301    case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
1302        qType = QUERY_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN;
1303        break;
1304    default:
1305        ASSERT(false);
1306    }
1307
1308    Query *queryObject = createQuery(query, target);
1309
1310    // Check that name was obtained with glGenQueries
1311    if(!queryObject)
1312    {
1313        return error(GL_INVALID_OPERATION);
1314    }
1315
1316    // Check for type mismatch
1317    if(queryObject->getType() != target)
1318    {
1319        return error(GL_INVALID_OPERATION);
1320    }
1321
1322    // Set query as active for specified target
1323    mState.activeQuery[qType] = queryObject;
1324
1325    // Begin query
1326    queryObject->begin();
1327}
1328
1329void Context::endQuery(GLenum target)
1330{
1331    QueryType qType;
1332
1333    switch(target)
1334    {
1335    case GL_ANY_SAMPLES_PASSED_EXT:
1336        qType = QUERY_ANY_SAMPLES_PASSED;
1337        break;
1338    case GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT:
1339        qType = QUERY_ANY_SAMPLES_PASSED_CONSERVATIVE;
1340        break;
1341    case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
1342        qType = QUERY_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN;
1343        break;
1344    default:
1345        ASSERT(false);
1346    }
1347
1348    Query *queryObject = mState.activeQuery[qType];
1349
1350    if(queryObject == NULL)
1351    {
1352        return error(GL_INVALID_OPERATION);
1353    }
1354
1355    queryObject->end();
1356
1357    mState.activeQuery[qType] = NULL;
1358}
1359
1360void Context::setFramebufferZero(Framebuffer *buffer)
1361{
1362    delete mFramebufferMap[0];
1363    mFramebufferMap[0] = buffer;
1364}
1365
1366void Context::setRenderbufferStorage(RenderbufferStorage *renderbuffer)
1367{
1368    Renderbuffer *renderbufferObject = mState.renderbuffer;
1369    renderbufferObject->setStorage(renderbuffer);
1370}
1371
1372Framebuffer *Context::getFramebuffer(unsigned int handle) const
1373{
1374    FramebufferMap::const_iterator framebuffer = mFramebufferMap.find(handle);
1375
1376    if(framebuffer == mFramebufferMap.end())
1377    {
1378        return NULL;
1379    }
1380    else
1381    {
1382        return framebuffer->second;
1383    }
1384}
1385
1386Fence *Context::getFence(unsigned int handle) const
1387{
1388    FenceMap::const_iterator fence = mFenceMap.find(handle);
1389
1390    if(fence == mFenceMap.end())
1391    {
1392        return NULL;
1393    }
1394    else
1395    {
1396        return fence->second;
1397    }
1398}
1399
1400Query *Context::getQuery(unsigned int handle) const
1401{
1402	QueryMap::const_iterator query = mQueryMap.find(handle);
1403
1404	if(query == mQueryMap.end())
1405	{
1406		return NULL;
1407	}
1408	else
1409	{
1410		return query->second;
1411	}
1412}
1413
1414Query *Context::createQuery(unsigned int handle, GLenum type)
1415{
1416	QueryMap::iterator query = mQueryMap.find(handle);
1417
1418	if(query == mQueryMap.end())
1419	{
1420		return NULL;
1421	}
1422	else
1423	{
1424		if(!query->second)
1425		{
1426			query->second = new Query(handle, type);
1427			query->second->addRef();
1428		}
1429
1430		return query->second;
1431	}
1432}
1433
1434VertexArray *Context::getVertexArray(GLuint array) const
1435{
1436	VertexArrayMap::const_iterator vertexArray = mVertexArrayMap.find(array);
1437
1438	return (vertexArray == mVertexArrayMap.end()) ? NULL : vertexArray->second;
1439}
1440
1441VertexArray *Context::getCurrentVertexArray() const
1442{
1443	return getVertexArray(mState.vertexArray);
1444}
1445
1446bool Context::hasZeroDivisor() const
1447{
1448	// Verify there is at least one active attribute with a divisor of zero
1449	es2::Program *programObject = getCurrentProgram();
1450	for(int attributeIndex = 0; attributeIndex < MAX_VERTEX_ATTRIBS; attributeIndex++)
1451	{
1452		bool active = (programObject->getAttributeStream(attributeIndex) != -1);
1453		if(active && getCurrentVertexArray()->getVertexAttribute(attributeIndex).mDivisor == 0)
1454		{
1455			return true;
1456		}
1457	}
1458
1459	return false;
1460}
1461
1462TransformFeedback *Context::getTransformFeedback(GLuint transformFeedback) const
1463{
1464	TransformFeedbackMap::const_iterator transformFeedbackObject = mTransformFeedbackMap.find(transformFeedback);
1465
1466	return (transformFeedbackObject == mTransformFeedbackMap.end()) ? NULL : transformFeedbackObject->second;
1467}
1468
1469Sampler *Context::getSampler(GLuint sampler) const
1470{
1471	SamplerMap::const_iterator samplerObject = mSamplerMap.find(sampler);
1472
1473	return (samplerObject == mSamplerMap.end()) ? NULL : samplerObject->second;
1474}
1475
1476Buffer *Context::getArrayBuffer() const
1477{
1478    return mState.arrayBuffer;
1479}
1480
1481Buffer *Context::getElementArrayBuffer() const
1482{
1483	return getCurrentVertexArray()->getElementArrayBuffer();
1484}
1485
1486Buffer *Context::getCopyReadBuffer() const
1487{
1488	return mState.copyReadBuffer;
1489}
1490
1491Buffer *Context::getCopyWriteBuffer() const
1492{
1493	return mState.copyWriteBuffer;
1494}
1495
1496Buffer *Context::getPixelPackBuffer() const
1497{
1498	return mState.pixelPackBuffer;
1499}
1500
1501Buffer *Context::getPixelUnpackBuffer() const
1502{
1503	return mState.pixelUnpackBuffer;
1504}
1505
1506Buffer *Context::getUniformBuffer() const
1507{
1508	return mState.uniformBuffer;
1509}
1510
1511bool Context::getBuffer(GLenum target, es2::Buffer **buffer) const
1512{
1513	switch(target)
1514	{
1515	case GL_ARRAY_BUFFER:
1516		*buffer = getArrayBuffer();
1517		break;
1518	case GL_ELEMENT_ARRAY_BUFFER:
1519		*buffer = getElementArrayBuffer();
1520		break;
1521	case GL_COPY_READ_BUFFER:
1522		if(clientVersion >= 3)
1523		{
1524			*buffer = getCopyReadBuffer();
1525			break;
1526		}
1527		else return false;
1528	case GL_COPY_WRITE_BUFFER:
1529		if(clientVersion >= 3)
1530		{
1531			*buffer = getCopyWriteBuffer();
1532			break;
1533		}
1534		else return false;
1535	case GL_PIXEL_PACK_BUFFER:
1536		if(clientVersion >= 3)
1537		{
1538			*buffer = getPixelPackBuffer();
1539			break;
1540		}
1541		else return false;
1542	case GL_PIXEL_UNPACK_BUFFER:
1543		if(clientVersion >= 3)
1544		{
1545			*buffer = getPixelUnpackBuffer();
1546			break;
1547		}
1548		else return false;
1549	case GL_TRANSFORM_FEEDBACK_BUFFER:
1550		if(clientVersion >= 3)
1551		{
1552			TransformFeedback* transformFeedback = getTransformFeedback();
1553			*buffer = transformFeedback ? static_cast<es2::Buffer*>(transformFeedback->getGenericBuffer()) : nullptr;
1554			break;
1555		}
1556		else return false;
1557	case GL_UNIFORM_BUFFER:
1558		if(clientVersion >= 3)
1559		{
1560			*buffer = getUniformBuffer();
1561			break;
1562		}
1563		else return false;
1564	default:
1565		return false;
1566	}
1567	return true;
1568}
1569
1570TransformFeedback *Context::getTransformFeedback() const
1571{
1572	return getTransformFeedback(mState.transformFeedback);
1573}
1574
1575Program *Context::getCurrentProgram() const
1576{
1577    return mResourceManager->getProgram(mState.currentProgram);
1578}
1579
1580Texture2D *Context::getTexture2D() const
1581{
1582	return static_cast<Texture2D*>(getSamplerTexture(mState.activeSampler, TEXTURE_2D));
1583}
1584
1585Texture3D *Context::getTexture3D() const
1586{
1587	return static_cast<Texture3D*>(getSamplerTexture(mState.activeSampler, TEXTURE_3D));
1588}
1589
1590TextureCubeMap *Context::getTextureCubeMap() const
1591{
1592    return static_cast<TextureCubeMap*>(getSamplerTexture(mState.activeSampler, TEXTURE_CUBE));
1593}
1594
1595TextureExternal *Context::getTextureExternal() const
1596{
1597    return static_cast<TextureExternal*>(getSamplerTexture(mState.activeSampler, TEXTURE_EXTERNAL));
1598}
1599
1600Texture *Context::getSamplerTexture(unsigned int sampler, TextureType type) const
1601{
1602    GLuint texid = mState.samplerTexture[type][sampler].name();
1603
1604    if(texid == 0)   // Special case: 0 refers to different initial textures based on the target
1605    {
1606        switch (type)
1607        {
1608        case TEXTURE_2D: return mTexture2DZero;
1609		case TEXTURE_3D: return mTexture3DZero;
1610        case TEXTURE_CUBE: return mTextureCubeMapZero;
1611        case TEXTURE_EXTERNAL: return mTextureExternalZero;
1612        default: UNREACHABLE();
1613        }
1614    }
1615
1616    return mState.samplerTexture[type][sampler];
1617}
1618
1619bool Context::getBooleanv(GLenum pname, GLboolean *params) const
1620{
1621    switch (pname)
1622    {
1623      case GL_SHADER_COMPILER:          *params = GL_TRUE;                          break;
1624      case GL_SAMPLE_COVERAGE_INVERT:   *params = mState.sampleCoverageInvert;      break;
1625      case GL_DEPTH_WRITEMASK:          *params = mState.depthMask;                 break;
1626      case GL_COLOR_WRITEMASK:
1627        params[0] = mState.colorMaskRed;
1628        params[1] = mState.colorMaskGreen;
1629        params[2] = mState.colorMaskBlue;
1630        params[3] = mState.colorMaskAlpha;
1631        break;
1632      case GL_CULL_FACE:                *params = mState.cullFace;                  break;
1633      case GL_POLYGON_OFFSET_FILL:      *params = mState.polygonOffsetFill;         break;
1634      case GL_SAMPLE_ALPHA_TO_COVERAGE: *params = mState.sampleAlphaToCoverage;     break;
1635      case GL_SAMPLE_COVERAGE:          *params = mState.sampleCoverage;            break;
1636      case GL_SCISSOR_TEST:             *params = mState.scissorTest;               break;
1637      case GL_STENCIL_TEST:             *params = mState.stencilTest;               break;
1638      case GL_DEPTH_TEST:               *params = mState.depthTest;                 break;
1639      case GL_BLEND:                    *params = mState.blend;                     break;
1640      case GL_DITHER:                   *params = mState.dither;                    break;
1641      case GL_PRIMITIVE_RESTART_FIXED_INDEX: *params = mState.primitiveRestartFixedIndex; break;
1642      case GL_RASTERIZER_DISCARD:       *params = mState.rasterizerDiscard;         break;
1643	  case GL_TRANSFORM_FEEDBACK_ACTIVE:
1644	  {
1645		  TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
1646		  if(transformFeedback)
1647		  {
1648			  *params = transformFeedback->isActive();
1649			  break;
1650		  }
1651		  else return false;
1652	  }
1653      case GL_TRANSFORM_FEEDBACK_PAUSED:
1654	  {
1655		  TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
1656		  if(transformFeedback)
1657		  {
1658			  *params = transformFeedback->isPaused();
1659			  break;
1660		  }
1661		  else return false;
1662	  }
1663      default:
1664        return false;
1665    }
1666
1667    return true;
1668}
1669
1670bool Context::getFloatv(GLenum pname, GLfloat *params) const
1671{
1672    // Please note: DEPTH_CLEAR_VALUE is included in our internal getFloatv implementation
1673    // because it is stored as a float, despite the fact that the GL ES 2.0 spec names
1674    // GetIntegerv as its native query function. As it would require conversion in any
1675    // case, this should make no difference to the calling application.
1676    switch (pname)
1677    {
1678      case GL_LINE_WIDTH:               *params = mState.lineWidth;            break;
1679      case GL_SAMPLE_COVERAGE_VALUE:    *params = mState.sampleCoverageValue;  break;
1680      case GL_DEPTH_CLEAR_VALUE:        *params = mState.depthClearValue;      break;
1681      case GL_POLYGON_OFFSET_FACTOR:    *params = mState.polygonOffsetFactor;  break;
1682      case GL_POLYGON_OFFSET_UNITS:     *params = mState.polygonOffsetUnits;   break;
1683      case GL_ALIASED_LINE_WIDTH_RANGE:
1684        params[0] = ALIASED_LINE_WIDTH_RANGE_MIN;
1685        params[1] = ALIASED_LINE_WIDTH_RANGE_MAX;
1686        break;
1687      case GL_ALIASED_POINT_SIZE_RANGE:
1688        params[0] = ALIASED_POINT_SIZE_RANGE_MIN;
1689        params[1] = ALIASED_POINT_SIZE_RANGE_MAX;
1690        break;
1691      case GL_DEPTH_RANGE:
1692        params[0] = mState.zNear;
1693        params[1] = mState.zFar;
1694        break;
1695      case GL_COLOR_CLEAR_VALUE:
1696        params[0] = mState.colorClearValue.red;
1697        params[1] = mState.colorClearValue.green;
1698        params[2] = mState.colorClearValue.blue;
1699        params[3] = mState.colorClearValue.alpha;
1700        break;
1701      case GL_BLEND_COLOR:
1702        params[0] = mState.blendColor.red;
1703        params[1] = mState.blendColor.green;
1704        params[2] = mState.blendColor.blue;
1705        params[3] = mState.blendColor.alpha;
1706        break;
1707	  case GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT:
1708        *params = MAX_TEXTURE_MAX_ANISOTROPY;
1709		break;
1710      default:
1711        return false;
1712    }
1713
1714    return true;
1715}
1716
1717template bool Context::getIntegerv<GLint>(GLenum pname, GLint *params) const;
1718template bool Context::getIntegerv<GLint64>(GLenum pname, GLint64 *params) const;
1719
1720template<typename T> bool Context::getIntegerv(GLenum pname, T *params) const
1721{
1722    // Please note: DEPTH_CLEAR_VALUE is not included in our internal getIntegerv implementation
1723    // because it is stored as a float, despite the fact that the GL ES 2.0 spec names
1724    // GetIntegerv as its native query function. As it would require conversion in any
1725    // case, this should make no difference to the calling application. You may find it in
1726    // Context::getFloatv.
1727    switch (pname)
1728    {
1729    case GL_MAX_VERTEX_ATTRIBS:               *params = MAX_VERTEX_ATTRIBS;               break;
1730    case GL_MAX_VERTEX_UNIFORM_VECTORS:       *params = MAX_VERTEX_UNIFORM_VECTORS;       break;
1731    case GL_MAX_VARYING_VECTORS:              *params = MAX_VARYING_VECTORS;              break;
1732    case GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS: *params = MAX_COMBINED_TEXTURE_IMAGE_UNITS; break;
1733    case GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:   *params = MAX_VERTEX_TEXTURE_IMAGE_UNITS;   break;
1734    case GL_MAX_TEXTURE_IMAGE_UNITS:          *params = MAX_TEXTURE_IMAGE_UNITS;          break;
1735	case GL_MAX_FRAGMENT_UNIFORM_VECTORS:     *params = MAX_FRAGMENT_UNIFORM_VECTORS;     break;
1736	case GL_MAX_RENDERBUFFER_SIZE:            *params = IMPLEMENTATION_MAX_RENDERBUFFER_SIZE; break;
1737    case GL_NUM_SHADER_BINARY_FORMATS:        *params = 0;                                    break;
1738    case GL_SHADER_BINARY_FORMATS:      /* no shader binary formats are supported */          break;
1739    case GL_ARRAY_BUFFER_BINDING:             *params = getArrayBufferName();                 break;
1740    case GL_ELEMENT_ARRAY_BUFFER_BINDING:     *params = getElementArrayBufferName();          break;
1741//	case GL_FRAMEBUFFER_BINDING:            // now equivalent to GL_DRAW_FRAMEBUFFER_BINDING_ANGLE
1742    case GL_DRAW_FRAMEBUFFER_BINDING_ANGLE:   *params = mState.drawFramebuffer;               break;
1743    case GL_READ_FRAMEBUFFER_BINDING_ANGLE:   *params = mState.readFramebuffer;               break;
1744    case GL_RENDERBUFFER_BINDING:             *params = mState.renderbuffer.name();           break;
1745    case GL_CURRENT_PROGRAM:                  *params = mState.currentProgram;                break;
1746    case GL_PACK_ALIGNMENT:                   *params = mState.packAlignment;                 break;
1747    case GL_UNPACK_ALIGNMENT:                 *params = mState.unpackAlignment;               break;
1748    case GL_GENERATE_MIPMAP_HINT:             *params = mState.generateMipmapHint;            break;
1749    case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES: *params = mState.fragmentShaderDerivativeHint; break;
1750    case GL_ACTIVE_TEXTURE:                   *params = (mState.activeSampler + GL_TEXTURE0); break;
1751    case GL_STENCIL_FUNC:                     *params = mState.stencilFunc;                   break;
1752    case GL_STENCIL_REF:                      *params = mState.stencilRef;                    break;
1753    case GL_STENCIL_VALUE_MASK:               *params = mState.stencilMask;                   break;
1754    case GL_STENCIL_BACK_FUNC:                *params = mState.stencilBackFunc;               break;
1755    case GL_STENCIL_BACK_REF:                 *params = mState.stencilBackRef;                break;
1756    case GL_STENCIL_BACK_VALUE_MASK:          *params = mState.stencilBackMask;               break;
1757    case GL_STENCIL_FAIL:                     *params = mState.stencilFail;                   break;
1758    case GL_STENCIL_PASS_DEPTH_FAIL:          *params = mState.stencilPassDepthFail;          break;
1759    case GL_STENCIL_PASS_DEPTH_PASS:          *params = mState.stencilPassDepthPass;          break;
1760    case GL_STENCIL_BACK_FAIL:                *params = mState.stencilBackFail;               break;
1761    case GL_STENCIL_BACK_PASS_DEPTH_FAIL:     *params = mState.stencilBackPassDepthFail;      break;
1762    case GL_STENCIL_BACK_PASS_DEPTH_PASS:     *params = mState.stencilBackPassDepthPass;      break;
1763    case GL_DEPTH_FUNC:                       *params = mState.depthFunc;                     break;
1764    case GL_BLEND_SRC_RGB:                    *params = mState.sourceBlendRGB;                break;
1765    case GL_BLEND_SRC_ALPHA:                  *params = mState.sourceBlendAlpha;              break;
1766    case GL_BLEND_DST_RGB:                    *params = mState.destBlendRGB;                  break;
1767    case GL_BLEND_DST_ALPHA:                  *params = mState.destBlendAlpha;                break;
1768    case GL_BLEND_EQUATION_RGB:               *params = mState.blendEquationRGB;              break;
1769    case GL_BLEND_EQUATION_ALPHA:             *params = mState.blendEquationAlpha;            break;
1770    case GL_STENCIL_WRITEMASK:                *params = mState.stencilWritemask;              break;
1771    case GL_STENCIL_BACK_WRITEMASK:           *params = mState.stencilBackWritemask;          break;
1772    case GL_STENCIL_CLEAR_VALUE:              *params = mState.stencilClearValue;             break;
1773    case GL_SUBPIXEL_BITS:                    *params = 4;                                    break;
1774	case GL_MAX_TEXTURE_SIZE:                 *params = IMPLEMENTATION_MAX_TEXTURE_SIZE;          break;
1775	case GL_MAX_CUBE_MAP_TEXTURE_SIZE:        *params = IMPLEMENTATION_MAX_CUBE_MAP_TEXTURE_SIZE; break;
1776    case GL_NUM_COMPRESSED_TEXTURE_FORMATS:   *params = NUM_COMPRESSED_TEXTURE_FORMATS;           break;
1777	case GL_MAX_SAMPLES_ANGLE:                *params = IMPLEMENTATION_MAX_SAMPLES;               break;
1778    case GL_SAMPLE_BUFFERS:
1779    case GL_SAMPLES:
1780        {
1781            Framebuffer *framebuffer = getDrawFramebuffer();
1782			int width, height, samples;
1783
1784            if(framebuffer->completeness(width, height, samples) == GL_FRAMEBUFFER_COMPLETE)
1785            {
1786                switch(pname)
1787                {
1788                case GL_SAMPLE_BUFFERS:
1789                    if(samples > 1)
1790                    {
1791                        *params = 1;
1792                    }
1793                    else
1794                    {
1795                        *params = 0;
1796                    }
1797                    break;
1798                case GL_SAMPLES:
1799                    *params = samples & ~1;
1800                    break;
1801                }
1802            }
1803            else
1804            {
1805                *params = 0;
1806            }
1807        }
1808        break;
1809    case GL_IMPLEMENTATION_COLOR_READ_TYPE:
1810		{
1811			Framebuffer *framebuffer = getReadFramebuffer();
1812			*params = framebuffer->getImplementationColorReadType();
1813		}
1814		break;
1815    case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
1816		{
1817			Framebuffer *framebuffer = getReadFramebuffer();
1818			*params = framebuffer->getImplementationColorReadFormat();
1819		}
1820		break;
1821    case GL_MAX_VIEWPORT_DIMS:
1822        {
1823			int maxDimension = IMPLEMENTATION_MAX_RENDERBUFFER_SIZE;
1824            params[0] = maxDimension;
1825            params[1] = maxDimension;
1826        }
1827        break;
1828    case GL_COMPRESSED_TEXTURE_FORMATS:
1829        {
1830			for(int i = 0; i < NUM_COMPRESSED_TEXTURE_FORMATS; i++)
1831            {
1832                params[i] = compressedTextureFormats[i];
1833            }
1834        }
1835        break;
1836    case GL_VIEWPORT:
1837        params[0] = mState.viewportX;
1838        params[1] = mState.viewportY;
1839        params[2] = mState.viewportWidth;
1840        params[3] = mState.viewportHeight;
1841        break;
1842    case GL_SCISSOR_BOX:
1843        params[0] = mState.scissorX;
1844        params[1] = mState.scissorY;
1845        params[2] = mState.scissorWidth;
1846        params[3] = mState.scissorHeight;
1847        break;
1848    case GL_CULL_FACE_MODE:                   *params = mState.cullMode;                 break;
1849    case GL_FRONT_FACE:                       *params = mState.frontFace;                break;
1850    case GL_RED_BITS:
1851    case GL_GREEN_BITS:
1852    case GL_BLUE_BITS:
1853    case GL_ALPHA_BITS:
1854        {
1855            Framebuffer *framebuffer = getDrawFramebuffer();
1856            Renderbuffer *colorbuffer = framebuffer->getColorbuffer(0);
1857
1858            if(colorbuffer)
1859            {
1860                switch (pname)
1861                {
1862                  case GL_RED_BITS:   *params = colorbuffer->getRedSize();   break;
1863                  case GL_GREEN_BITS: *params = colorbuffer->getGreenSize(); break;
1864                  case GL_BLUE_BITS:  *params = colorbuffer->getBlueSize();  break;
1865                  case GL_ALPHA_BITS: *params = colorbuffer->getAlphaSize(); break;
1866                }
1867            }
1868            else
1869            {
1870                *params = 0;
1871            }
1872        }
1873        break;
1874    case GL_DEPTH_BITS:
1875        {
1876            Framebuffer *framebuffer = getDrawFramebuffer();
1877            Renderbuffer *depthbuffer = framebuffer->getDepthbuffer();
1878
1879            if(depthbuffer)
1880            {
1881                *params = depthbuffer->getDepthSize();
1882            }
1883            else
1884            {
1885                *params = 0;
1886            }
1887        }
1888        break;
1889    case GL_STENCIL_BITS:
1890        {
1891            Framebuffer *framebuffer = getDrawFramebuffer();
1892            Renderbuffer *stencilbuffer = framebuffer->getStencilbuffer();
1893
1894            if(stencilbuffer)
1895            {
1896                *params = stencilbuffer->getStencilSize();
1897            }
1898            else
1899            {
1900                *params = 0;
1901            }
1902        }
1903        break;
1904    case GL_TEXTURE_BINDING_2D:
1905        {
1906            if(mState.activeSampler < 0 || mState.activeSampler > MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
1907            {
1908                error(GL_INVALID_OPERATION);
1909                return false;
1910            }
1911
1912            *params = mState.samplerTexture[TEXTURE_2D][mState.activeSampler].name();
1913        }
1914        break;
1915    case GL_TEXTURE_BINDING_CUBE_MAP:
1916        {
1917            if(mState.activeSampler < 0 || mState.activeSampler > MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
1918            {
1919                error(GL_INVALID_OPERATION);
1920                return false;
1921            }
1922
1923            *params = mState.samplerTexture[TEXTURE_CUBE][mState.activeSampler].name();
1924        }
1925        break;
1926    case GL_TEXTURE_BINDING_EXTERNAL_OES:
1927        {
1928            if(mState.activeSampler < 0 || mState.activeSampler > MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
1929            {
1930                error(GL_INVALID_OPERATION);
1931                return false;
1932            }
1933
1934            *params = mState.samplerTexture[TEXTURE_EXTERNAL][mState.activeSampler].name();
1935        }
1936        break;
1937	case GL_TEXTURE_BINDING_3D_OES:
1938	case GL_TEXTURE_BINDING_2D_ARRAY: // GLES 3.0
1939	    {
1940			if(mState.activeSampler < 0 || mState.activeSampler > MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
1941			{
1942				error(GL_INVALID_OPERATION);
1943				return false;
1944			}
1945
1946			*params = mState.samplerTexture[TEXTURE_3D][mState.activeSampler].name();
1947		}
1948		break;
1949	case GL_COPY_READ_BUFFER_BINDING: // name, initially 0
1950		if(clientVersion >= 3)
1951		{
1952			*params = mState.copyReadBuffer.name();
1953		}
1954		else
1955		{
1956			return false;
1957		}
1958		break;
1959	case GL_COPY_WRITE_BUFFER_BINDING: // name, initially 0
1960		if(clientVersion >= 3)
1961		{
1962			*params = mState.copyWriteBuffer.name();
1963		}
1964		else
1965		{
1966			return false;
1967		}
1968		break;
1969	case GL_DRAW_BUFFER0: // symbolic constant, initial value is GL_BACK​
1970		UNIMPLEMENTED();
1971		*params = GL_BACK;
1972		break;
1973	case GL_DRAW_BUFFER1: // symbolic constant, initial value is GL_NONE
1974	case GL_DRAW_BUFFER2:
1975	case GL_DRAW_BUFFER3:
1976	case GL_DRAW_BUFFER4:
1977	case GL_DRAW_BUFFER5:
1978	case GL_DRAW_BUFFER6:
1979	case GL_DRAW_BUFFER7:
1980	case GL_DRAW_BUFFER8:
1981	case GL_DRAW_BUFFER9:
1982	case GL_DRAW_BUFFER10:
1983	case GL_DRAW_BUFFER11:
1984	case GL_DRAW_BUFFER12:
1985	case GL_DRAW_BUFFER13:
1986	case GL_DRAW_BUFFER14:
1987	case GL_DRAW_BUFFER15:
1988		UNIMPLEMENTED();
1989		*params = GL_NONE;
1990		break;
1991	case GL_MAJOR_VERSION: // integer, at least 3
1992		UNIMPLEMENTED();
1993		*params = 3;
1994		break;
1995	case GL_MAX_3D_TEXTURE_SIZE: // GLint, at least 2048
1996		*params = IMPLEMENTATION_MAX_TEXTURE_SIZE;
1997		break;
1998	case GL_MAX_ARRAY_TEXTURE_LAYERS: // GLint, at least 2048
1999		*params = IMPLEMENTATION_MAX_TEXTURE_SIZE;
2000		break;
2001	case GL_MAX_COLOR_ATTACHMENTS: // integer, at least 8
2002		UNIMPLEMENTED();
2003		*params = IMPLEMENTATION_MAX_COLOR_ATTACHMENTS;
2004		break;
2005	case GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS: // integer, at least 50048
2006		UNIMPLEMENTED();
2007		*params = MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS;
2008		break;
2009	case GL_MAX_COMBINED_UNIFORM_BLOCKS: // integer, at least 70
2010		UNIMPLEMENTED();
2011		*params = 70;
2012		break;
2013	case GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS: // integer, at least 50176
2014		UNIMPLEMENTED();
2015		*params = MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS;
2016		break;
2017	case GL_MAX_DRAW_BUFFERS: // integer, at least 8
2018		UNIMPLEMENTED();
2019		*params = IMPLEMENTATION_MAX_DRAW_BUFFERS;
2020		break;
2021	case GL_MAX_ELEMENT_INDEX:
2022		*params = MAX_ELEMENT_INDEX;
2023		break;
2024	case GL_MAX_ELEMENTS_INDICES:
2025		*params = MAX_ELEMENTS_INDICES;
2026		break;
2027	case GL_MAX_ELEMENTS_VERTICES:
2028		*params = MAX_ELEMENTS_VERTICES;
2029		break;
2030	case GL_MAX_FRAGMENT_INPUT_COMPONENTS: // integer, at least 128
2031		UNIMPLEMENTED();
2032		*params = 128;
2033		break;
2034	case GL_MAX_FRAGMENT_UNIFORM_BLOCKS: // integer, at least 12
2035		UNIMPLEMENTED();
2036		*params = 12;
2037		break;
2038	case GL_MAX_FRAGMENT_UNIFORM_COMPONENTS: // integer, at least 1024
2039		UNIMPLEMENTED();
2040		*params = 1024;
2041		break;
2042	case GL_MAX_PROGRAM_TEXEL_OFFSET: // integer, minimum is 7
2043		UNIMPLEMENTED();
2044		*params = 7;
2045		break;
2046	case GL_MAX_SERVER_WAIT_TIMEOUT: // integer
2047		UNIMPLEMENTED();
2048		*params = 0;
2049		break;
2050	case GL_MAX_TEXTURE_LOD_BIAS: // integer,  at least 2.0
2051		UNIMPLEMENTED();
2052		*params = 2;
2053		break;
2054	case GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS: // integer, at least 64
2055		UNIMPLEMENTED();
2056		*params = 64;
2057		break;
2058	case GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS: // integer, at least 4
2059		UNIMPLEMENTED();
2060		*params = IMPLEMENTATION_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS;
2061		break;
2062	case GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS: // integer, at least 4
2063		UNIMPLEMENTED();
2064		*params = 4;
2065		break;
2066	case GL_MAX_UNIFORM_BLOCK_SIZE: // integer, at least 16384
2067		UNIMPLEMENTED();
2068		*params = 16384;
2069		break;
2070	case GL_MAX_UNIFORM_BUFFER_BINDINGS: // integer, at least 36
2071		UNIMPLEMENTED();
2072		*params = IMPLEMENTATION_MAX_UNIFORM_BUFFER_BINDINGS;
2073		break;
2074	case GL_MAX_VARYING_COMPONENTS: // integer, at least 60
2075		UNIMPLEMENTED();
2076		*params = 60;
2077		break;
2078	case GL_MAX_VERTEX_OUTPUT_COMPONENTS: // integer,  at least 64
2079		UNIMPLEMENTED();
2080		*params = 64;
2081		break;
2082	case GL_MAX_VERTEX_UNIFORM_BLOCKS: // integer,  at least 12
2083		UNIMPLEMENTED();
2084		*params = 12;
2085		break;
2086	case GL_MAX_VERTEX_UNIFORM_COMPONENTS: // integer,  at least 1024
2087		UNIMPLEMENTED();
2088		*params = 1024;
2089		break;
2090	case GL_MIN_PROGRAM_TEXEL_OFFSET: // integer, maximum is -8
2091		UNIMPLEMENTED();
2092		*params = -8;
2093		break;
2094	case GL_MINOR_VERSION: // integer
2095		UNIMPLEMENTED();
2096		*params = 0;
2097		break;
2098	case GL_NUM_EXTENSIONS: // integer
2099		GLuint numExtensions;
2100		getExtensions(0, &numExtensions);
2101		*params = numExtensions;
2102		break;
2103	case GL_NUM_PROGRAM_BINARY_FORMATS: // integer, at least 0
2104		UNIMPLEMENTED();
2105		*params = 0;
2106		break;
2107	case GL_PACK_ROW_LENGTH: // integer, initially 0
2108		UNIMPLEMENTED();
2109		*params = 0;
2110		break;
2111	case GL_PACK_SKIP_PIXELS: // integer, initially 0
2112		UNIMPLEMENTED();
2113		*params = 0;
2114		break;
2115	case GL_PACK_SKIP_ROWS: // integer, initially 0
2116		UNIMPLEMENTED();
2117		*params = 0;
2118		break;
2119	case GL_PIXEL_PACK_BUFFER_BINDING: // integer, initially 0
2120		if(clientVersion >= 3)
2121		{
2122			*params = mState.pixelPackBuffer.name();
2123		}
2124		else
2125		{
2126			return false;
2127		}
2128		break;
2129	case GL_PIXEL_UNPACK_BUFFER_BINDING: // integer, initially 0
2130		if(clientVersion >= 3)
2131		{
2132			*params = mState.pixelUnpackBuffer.name();
2133		}
2134		else
2135		{
2136			return false;
2137		}
2138		break;
2139	case GL_PROGRAM_BINARY_FORMATS: // integer[GL_NUM_PROGRAM_BINARY_FORMATS​]
2140		UNIMPLEMENTED();
2141		*params = 0;
2142		break;
2143	case GL_READ_BUFFER: // symbolic constant,  initial value is GL_BACK​
2144		UNIMPLEMENTED();
2145		*params = GL_BACK;
2146		break;
2147	case GL_SAMPLER_BINDING: // GLint, default 0
2148		UNIMPLEMENTED();
2149		*params = 0;
2150		break;
2151	case GL_UNIFORM_BUFFER_BINDING: // name, initially 0
2152		if(clientVersion >= 3)
2153		{
2154			*params = mState.uniformBuffer.name();
2155		}
2156		else
2157		{
2158			return false;
2159		}
2160		break;
2161	case GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT: // integer, defaults to 1
2162		UNIMPLEMENTED();
2163		*params = IMPLEMENTATION_UNIFORM_BUFFER_OFFSET_ALIGNMENT;
2164		break;
2165	case GL_UNIFORM_BUFFER_SIZE: // indexed[n] 64-bit integer, initially 0
2166		UNIMPLEMENTED();
2167		*params = 0;
2168		break;
2169	case GL_UNIFORM_BUFFER_START: // indexed[n] 64-bit integer, initially 0
2170		UNIMPLEMENTED();
2171		*params = 0;
2172		break;
2173	case GL_UNPACK_IMAGE_HEIGHT: // integer, initially 0
2174		UNIMPLEMENTED();
2175		*params = 0;
2176		break;
2177	case GL_UNPACK_ROW_LENGTH: // integer, initially 0
2178		UNIMPLEMENTED();
2179		*params = 0;
2180		break;
2181	case GL_UNPACK_SKIP_IMAGES: // integer, initially 0
2182		UNIMPLEMENTED();
2183		*params = 0;
2184		break;
2185	case GL_UNPACK_SKIP_PIXELS: // integer, initially 0
2186		UNIMPLEMENTED();
2187		*params = 0;
2188		break;
2189	case GL_UNPACK_SKIP_ROWS: // integer, initially 0
2190		UNIMPLEMENTED();
2191		*params = 0;
2192		break;
2193	case GL_VERTEX_ARRAY_BINDING: // GLint, initially 0
2194		*params = getCurrentVertexArray()->name;
2195		break;
2196	default:
2197        return false;
2198    }
2199
2200    return true;
2201}
2202
2203template bool Context::getTransformFeedbackiv<GLint>(GLuint xfb, GLenum pname, GLint *param) const;
2204template bool Context::getTransformFeedbackiv<GLint64>(GLuint xfb, GLenum pname, GLint64 *param) const;
2205
2206template<typename T> bool Context::getTransformFeedbackiv(GLuint xfb, GLenum pname, T *param) const
2207{
2208	UNIMPLEMENTED();
2209
2210	TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
2211	if(!transformFeedback)
2212	{
2213		return false;
2214	}
2215
2216	switch(pname)
2217	{
2218	case GL_TRANSFORM_FEEDBACK_BINDING: // GLint, initially 0
2219		*param = 0;
2220		break;
2221	case GL_TRANSFORM_FEEDBACK_ACTIVE: // boolean, initially GL_FALSE
2222		*param = transformFeedback->isActive();
2223		break;
2224	case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING: // name, initially 0
2225		*param = transformFeedback->name;
2226		break;
2227	case GL_TRANSFORM_FEEDBACK_PAUSED: // boolean, initially GL_FALSE
2228		*param = transformFeedback->isPaused();
2229		break;
2230	case GL_TRANSFORM_FEEDBACK_BUFFER_SIZE: // indexed[n] 64-bit integer, initially 0
2231		if(transformFeedback->getGenericBuffer())
2232		{
2233			*param = transformFeedback->getGenericBuffer()->size();
2234			break;
2235		}
2236		else return false;
2237	case GL_TRANSFORM_FEEDBACK_BUFFER_START: // indexed[n] 64-bit integer, initially 0
2238		*param = 0;
2239		break;
2240	default:
2241		return false;
2242	}
2243
2244	return true;
2245}
2246
2247bool Context::getQueryParameterInfo(GLenum pname, GLenum *type, unsigned int *numParams) const
2248{
2249    // Please note: the query type returned for DEPTH_CLEAR_VALUE in this implementation
2250    // is FLOAT rather than INT, as would be suggested by the GL ES 2.0 spec. This is due
2251    // to the fact that it is stored internally as a float, and so would require conversion
2252    // if returned from Context::getIntegerv. Since this conversion is already implemented
2253    // in the case that one calls glGetIntegerv to retrieve a float-typed state variable, we
2254    // place DEPTH_CLEAR_VALUE with the floats. This should make no difference to the calling
2255    // application.
2256    switch (pname)
2257    {
2258      case GL_COMPRESSED_TEXTURE_FORMATS:
2259		{
2260            *type = GL_INT;
2261			*numParams = NUM_COMPRESSED_TEXTURE_FORMATS;
2262        }
2263		break;
2264      case GL_SHADER_BINARY_FORMATS:
2265        {
2266            *type = GL_INT;
2267            *numParams = 0;
2268        }
2269        break;
2270      case GL_MAX_VERTEX_ATTRIBS:
2271      case GL_MAX_VERTEX_UNIFORM_VECTORS:
2272      case GL_MAX_VARYING_VECTORS:
2273      case GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS:
2274      case GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:
2275      case GL_MAX_TEXTURE_IMAGE_UNITS:
2276      case GL_MAX_FRAGMENT_UNIFORM_VECTORS:
2277      case GL_MAX_RENDERBUFFER_SIZE:
2278      case GL_NUM_SHADER_BINARY_FORMATS:
2279      case GL_NUM_COMPRESSED_TEXTURE_FORMATS:
2280      case GL_ARRAY_BUFFER_BINDING:
2281      case GL_FRAMEBUFFER_BINDING:
2282      case GL_RENDERBUFFER_BINDING:
2283      case GL_CURRENT_PROGRAM:
2284      case GL_PACK_ALIGNMENT:
2285      case GL_UNPACK_ALIGNMENT:
2286      case GL_GENERATE_MIPMAP_HINT:
2287      case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES:
2288      case GL_RED_BITS:
2289      case GL_GREEN_BITS:
2290      case GL_BLUE_BITS:
2291      case GL_ALPHA_BITS:
2292      case GL_DEPTH_BITS:
2293      case GL_STENCIL_BITS:
2294      case GL_ELEMENT_ARRAY_BUFFER_BINDING:
2295      case GL_CULL_FACE_MODE:
2296      case GL_FRONT_FACE:
2297      case GL_ACTIVE_TEXTURE:
2298      case GL_STENCIL_FUNC:
2299      case GL_STENCIL_VALUE_MASK:
2300      case GL_STENCIL_REF:
2301      case GL_STENCIL_FAIL:
2302      case GL_STENCIL_PASS_DEPTH_FAIL:
2303      case GL_STENCIL_PASS_DEPTH_PASS:
2304      case GL_STENCIL_BACK_FUNC:
2305      case GL_STENCIL_BACK_VALUE_MASK:
2306      case GL_STENCIL_BACK_REF:
2307      case GL_STENCIL_BACK_FAIL:
2308      case GL_STENCIL_BACK_PASS_DEPTH_FAIL:
2309      case GL_STENCIL_BACK_PASS_DEPTH_PASS:
2310      case GL_DEPTH_FUNC:
2311      case GL_BLEND_SRC_RGB:
2312      case GL_BLEND_SRC_ALPHA:
2313      case GL_BLEND_DST_RGB:
2314      case GL_BLEND_DST_ALPHA:
2315      case GL_BLEND_EQUATION_RGB:
2316      case GL_BLEND_EQUATION_ALPHA:
2317      case GL_STENCIL_WRITEMASK:
2318      case GL_STENCIL_BACK_WRITEMASK:
2319      case GL_STENCIL_CLEAR_VALUE:
2320      case GL_SUBPIXEL_BITS:
2321      case GL_MAX_TEXTURE_SIZE:
2322      case GL_MAX_CUBE_MAP_TEXTURE_SIZE:
2323      case GL_SAMPLE_BUFFERS:
2324      case GL_SAMPLES:
2325      case GL_IMPLEMENTATION_COLOR_READ_TYPE:
2326      case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
2327      case GL_TEXTURE_BINDING_2D:
2328      case GL_TEXTURE_BINDING_CUBE_MAP:
2329      case GL_TEXTURE_BINDING_EXTERNAL_OES:
2330      case GL_TEXTURE_BINDING_3D_OES:
2331      case GL_COPY_READ_BUFFER_BINDING:
2332      case GL_COPY_WRITE_BUFFER_BINDING:
2333      case GL_DRAW_BUFFER0:
2334      case GL_DRAW_BUFFER1:
2335      case GL_DRAW_BUFFER2:
2336      case GL_DRAW_BUFFER3:
2337      case GL_DRAW_BUFFER4:
2338      case GL_DRAW_BUFFER5:
2339      case GL_DRAW_BUFFER6:
2340      case GL_DRAW_BUFFER7:
2341      case GL_DRAW_BUFFER8:
2342      case GL_DRAW_BUFFER9:
2343      case GL_DRAW_BUFFER10:
2344      case GL_DRAW_BUFFER11:
2345      case GL_DRAW_BUFFER12:
2346      case GL_DRAW_BUFFER13:
2347      case GL_DRAW_BUFFER14:
2348      case GL_DRAW_BUFFER15:
2349      case GL_MAJOR_VERSION:
2350      case GL_MAX_3D_TEXTURE_SIZE:
2351      case GL_MAX_ARRAY_TEXTURE_LAYERS:
2352      case GL_MAX_COLOR_ATTACHMENTS:
2353      case GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS:
2354      case GL_MAX_COMBINED_UNIFORM_BLOCKS:
2355      case GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS:
2356      case GL_MAX_DRAW_BUFFERS:
2357      case GL_MAX_ELEMENT_INDEX:
2358      case GL_MAX_ELEMENTS_INDICES:
2359      case GL_MAX_ELEMENTS_VERTICES:
2360      case GL_MAX_FRAGMENT_INPUT_COMPONENTS:
2361      case GL_MAX_FRAGMENT_UNIFORM_BLOCKS:
2362      case GL_MAX_FRAGMENT_UNIFORM_COMPONENTS:
2363      case GL_MAX_PROGRAM_TEXEL_OFFSET:
2364      case GL_MAX_SERVER_WAIT_TIMEOUT:
2365      case GL_MAX_TEXTURE_LOD_BIAS:
2366      case GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS:
2367      case GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS:
2368      case GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS:
2369      case GL_MAX_UNIFORM_BLOCK_SIZE:
2370      case GL_MAX_UNIFORM_BUFFER_BINDINGS:
2371      case GL_MAX_VARYING_COMPONENTS:
2372      case GL_MAX_VERTEX_OUTPUT_COMPONENTS:
2373      case GL_MAX_VERTEX_UNIFORM_BLOCKS:
2374      case GL_MAX_VERTEX_UNIFORM_COMPONENTS:
2375      case GL_MIN_PROGRAM_TEXEL_OFFSET:
2376      case GL_MINOR_VERSION:
2377      case GL_NUM_EXTENSIONS:
2378      case GL_NUM_PROGRAM_BINARY_FORMATS:
2379      case GL_PACK_ROW_LENGTH:
2380      case GL_PACK_SKIP_PIXELS:
2381      case GL_PACK_SKIP_ROWS:
2382      case GL_PIXEL_PACK_BUFFER_BINDING:
2383      case GL_PIXEL_UNPACK_BUFFER_BINDING:
2384      case GL_PROGRAM_BINARY_FORMATS:
2385      case GL_READ_BUFFER:
2386      case GL_SAMPLER_BINDING:
2387      case GL_TEXTURE_BINDING_2D_ARRAY:
2388      case GL_UNIFORM_BUFFER_BINDING:
2389      case GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT:
2390      case GL_UNIFORM_BUFFER_SIZE:
2391      case GL_UNIFORM_BUFFER_START:
2392      case GL_UNPACK_IMAGE_HEIGHT:
2393      case GL_UNPACK_ROW_LENGTH:
2394      case GL_UNPACK_SKIP_IMAGES:
2395      case GL_UNPACK_SKIP_PIXELS:
2396      case GL_UNPACK_SKIP_ROWS:
2397      case GL_VERTEX_ARRAY_BINDING:
2398        {
2399            *type = GL_INT;
2400            *numParams = 1;
2401        }
2402        break;
2403      case GL_MAX_SAMPLES_ANGLE:
2404        {
2405            *type = GL_INT;
2406            *numParams = 1;
2407        }
2408        break;
2409      case GL_MAX_VIEWPORT_DIMS:
2410        {
2411            *type = GL_INT;
2412            *numParams = 2;
2413        }
2414        break;
2415      case GL_VIEWPORT:
2416      case GL_SCISSOR_BOX:
2417        {
2418            *type = GL_INT;
2419            *numParams = 4;
2420        }
2421        break;
2422      case GL_SHADER_COMPILER:
2423      case GL_SAMPLE_COVERAGE_INVERT:
2424      case GL_DEPTH_WRITEMASK:
2425      case GL_CULL_FACE:                // CULL_FACE through DITHER are natural to IsEnabled,
2426      case GL_POLYGON_OFFSET_FILL:      // but can be retrieved through the Get{Type}v queries.
2427      case GL_SAMPLE_ALPHA_TO_COVERAGE: // For this purpose, they are treated here as bool-natural
2428      case GL_SAMPLE_COVERAGE:
2429      case GL_SCISSOR_TEST:
2430      case GL_STENCIL_TEST:
2431      case GL_DEPTH_TEST:
2432      case GL_BLEND:
2433      case GL_DITHER:
2434      case GL_PRIMITIVE_RESTART_FIXED_INDEX:
2435      case GL_RASTERIZER_DISCARD:
2436        {
2437            *type = GL_BOOL;
2438            *numParams = 1;
2439        }
2440        break;
2441      case GL_COLOR_WRITEMASK:
2442        {
2443            *type = GL_BOOL;
2444            *numParams = 4;
2445        }
2446        break;
2447      case GL_POLYGON_OFFSET_FACTOR:
2448      case GL_POLYGON_OFFSET_UNITS:
2449      case GL_SAMPLE_COVERAGE_VALUE:
2450      case GL_DEPTH_CLEAR_VALUE:
2451      case GL_LINE_WIDTH:
2452        {
2453            *type = GL_FLOAT;
2454            *numParams = 1;
2455        }
2456        break;
2457      case GL_ALIASED_LINE_WIDTH_RANGE:
2458      case GL_ALIASED_POINT_SIZE_RANGE:
2459      case GL_DEPTH_RANGE:
2460        {
2461            *type = GL_FLOAT;
2462            *numParams = 2;
2463        }
2464        break;
2465      case GL_COLOR_CLEAR_VALUE:
2466      case GL_BLEND_COLOR:
2467        {
2468            *type = GL_FLOAT;
2469            *numParams = 4;
2470        }
2471        break;
2472	  case GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT:
2473        *type = GL_FLOAT;
2474        *numParams = 1;
2475        break;
2476      default:
2477        return false;
2478    }
2479
2480    return true;
2481}
2482
2483// Applies the render target surface, depth stencil surface, viewport rectangle and scissor rectangle
2484bool Context::applyRenderTarget()
2485{
2486    Framebuffer *framebuffer = getDrawFramebuffer();
2487	int width, height, samples;
2488
2489    if(!framebuffer || framebuffer->completeness(width, height, samples) != GL_FRAMEBUFFER_COMPLETE)
2490    {
2491        return error(GL_INVALID_FRAMEBUFFER_OPERATION, false);
2492    }
2493
2494	egl::Image *renderTarget = framebuffer->getRenderTarget(0);
2495	device->setRenderTarget(renderTarget);
2496	if(renderTarget) renderTarget->release();
2497
2498    egl::Image *depthStencil = framebuffer->getDepthStencil();
2499    device->setDepthStencilSurface(depthStencil);
2500	if(depthStencil) depthStencil->release();
2501
2502    Viewport viewport;
2503    float zNear = clamp01(mState.zNear);
2504    float zFar = clamp01(mState.zFar);
2505
2506    viewport.x0 = mState.viewportX;
2507    viewport.y0 = mState.viewportY;
2508    viewport.width = mState.viewportWidth;
2509    viewport.height = mState.viewportHeight;
2510    viewport.minZ = zNear;
2511    viewport.maxZ = zFar;
2512
2513    device->setViewport(viewport);
2514
2515    if(mState.scissorTest)
2516    {
2517		sw::Rect scissor = {mState.scissorX, mState.scissorY, mState.scissorX + mState.scissorWidth, mState.scissorY + mState.scissorHeight};
2518		scissor.clip(0, 0, width, height);
2519
2520		device->setScissorRect(scissor);
2521        device->setScissorEnable(true);
2522    }
2523    else
2524    {
2525        device->setScissorEnable(false);
2526    }
2527
2528	Program *program = getCurrentProgram();
2529
2530	if(program)
2531	{
2532		GLfloat nearFarDiff[3] = {zNear, zFar, zFar - zNear};
2533        program->setUniform1fv(program->getUniformLocation("gl_DepthRange.near"), 1, &nearFarDiff[0]);
2534		program->setUniform1fv(program->getUniformLocation("gl_DepthRange.far"), 1, &nearFarDiff[1]);
2535		program->setUniform1fv(program->getUniformLocation("gl_DepthRange.diff"), 1, &nearFarDiff[2]);
2536    }
2537
2538    return true;
2539}
2540
2541// Applies the fixed-function state (culling, depth test, alpha blending, stenciling, etc)
2542void Context::applyState(GLenum drawMode)
2543{
2544    Framebuffer *framebuffer = getDrawFramebuffer();
2545
2546    if(mState.cullFace)
2547    {
2548        device->setCullMode(es2sw::ConvertCullMode(mState.cullMode, mState.frontFace));
2549    }
2550    else
2551    {
2552		device->setCullMode(sw::CULL_NONE);
2553    }
2554
2555    if(mDepthStateDirty)
2556    {
2557        if(mState.depthTest)
2558        {
2559			device->setDepthBufferEnable(true);
2560			device->setDepthCompare(es2sw::ConvertDepthComparison(mState.depthFunc));
2561        }
2562        else
2563        {
2564            device->setDepthBufferEnable(false);
2565        }
2566
2567        mDepthStateDirty = false;
2568    }
2569
2570    if(mBlendStateDirty)
2571    {
2572        if(mState.blend)
2573        {
2574			device->setAlphaBlendEnable(true);
2575			device->setSeparateAlphaBlendEnable(true);
2576
2577            device->setBlendConstant(es2sw::ConvertColor(mState.blendColor));
2578
2579			device->setSourceBlendFactor(es2sw::ConvertBlendFunc(mState.sourceBlendRGB));
2580			device->setDestBlendFactor(es2sw::ConvertBlendFunc(mState.destBlendRGB));
2581			device->setBlendOperation(es2sw::ConvertBlendOp(mState.blendEquationRGB));
2582
2583            device->setSourceBlendFactorAlpha(es2sw::ConvertBlendFunc(mState.sourceBlendAlpha));
2584			device->setDestBlendFactorAlpha(es2sw::ConvertBlendFunc(mState.destBlendAlpha));
2585			device->setBlendOperationAlpha(es2sw::ConvertBlendOp(mState.blendEquationAlpha));
2586        }
2587        else
2588        {
2589			device->setAlphaBlendEnable(false);
2590        }
2591
2592        mBlendStateDirty = false;
2593    }
2594
2595    if(mStencilStateDirty || mFrontFaceDirty)
2596    {
2597        if(mState.stencilTest && framebuffer->hasStencil())
2598        {
2599			device->setStencilEnable(true);
2600			device->setTwoSidedStencil(true);
2601
2602            if(mState.stencilWritemask != mState.stencilBackWritemask ||
2603               mState.stencilRef != mState.stencilBackRef ||
2604               mState.stencilMask != mState.stencilBackMask)
2605            {
2606				ERR("Separate front/back stencil writemasks, reference values, or stencil mask values are invalid under WebGL.");
2607                return error(GL_INVALID_OPERATION);
2608            }
2609
2610            // get the maximum size of the stencil ref
2611            Renderbuffer *stencilbuffer = framebuffer->getStencilbuffer();
2612            GLuint maxStencil = (1 << stencilbuffer->getStencilSize()) - 1;
2613
2614			if(mState.frontFace == GL_CCW)
2615			{
2616				device->setStencilWriteMask(mState.stencilWritemask);
2617				device->setStencilCompare(es2sw::ConvertStencilComparison(mState.stencilFunc));
2618
2619				device->setStencilReference((mState.stencilRef < (GLint)maxStencil) ? mState.stencilRef : maxStencil);
2620				device->setStencilMask(mState.stencilMask);
2621
2622				device->setStencilFailOperation(es2sw::ConvertStencilOp(mState.stencilFail));
2623				device->setStencilZFailOperation(es2sw::ConvertStencilOp(mState.stencilPassDepthFail));
2624				device->setStencilPassOperation(es2sw::ConvertStencilOp(mState.stencilPassDepthPass));
2625
2626				device->setStencilWriteMaskCCW(mState.stencilBackWritemask);
2627				device->setStencilCompareCCW(es2sw::ConvertStencilComparison(mState.stencilBackFunc));
2628
2629				device->setStencilReferenceCCW((mState.stencilBackRef < (GLint)maxStencil) ? mState.stencilBackRef : maxStencil);
2630				device->setStencilMaskCCW(mState.stencilBackMask);
2631
2632				device->setStencilFailOperationCCW(es2sw::ConvertStencilOp(mState.stencilBackFail));
2633				device->setStencilZFailOperationCCW(es2sw::ConvertStencilOp(mState.stencilBackPassDepthFail));
2634				device->setStencilPassOperationCCW(es2sw::ConvertStencilOp(mState.stencilBackPassDepthPass));
2635			}
2636			else
2637			{
2638				device->setStencilWriteMaskCCW(mState.stencilWritemask);
2639				device->setStencilCompareCCW(es2sw::ConvertStencilComparison(mState.stencilFunc));
2640
2641				device->setStencilReferenceCCW((mState.stencilRef < (GLint)maxStencil) ? mState.stencilRef : maxStencil);
2642				device->setStencilMaskCCW(mState.stencilMask);
2643
2644				device->setStencilFailOperationCCW(es2sw::ConvertStencilOp(mState.stencilFail));
2645				device->setStencilZFailOperationCCW(es2sw::ConvertStencilOp(mState.stencilPassDepthFail));
2646				device->setStencilPassOperationCCW(es2sw::ConvertStencilOp(mState.stencilPassDepthPass));
2647
2648				device->setStencilWriteMask(mState.stencilBackWritemask);
2649				device->setStencilCompare(es2sw::ConvertStencilComparison(mState.stencilBackFunc));
2650
2651				device->setStencilReference((mState.stencilBackRef < (GLint)maxStencil) ? mState.stencilBackRef : maxStencil);
2652				device->setStencilMask(mState.stencilBackMask);
2653
2654				device->setStencilFailOperation(es2sw::ConvertStencilOp(mState.stencilBackFail));
2655				device->setStencilZFailOperation(es2sw::ConvertStencilOp(mState.stencilBackPassDepthFail));
2656				device->setStencilPassOperation(es2sw::ConvertStencilOp(mState.stencilBackPassDepthPass));
2657			}
2658        }
2659        else
2660        {
2661			device->setStencilEnable(false);
2662        }
2663
2664        mStencilStateDirty = false;
2665        mFrontFaceDirty = false;
2666    }
2667
2668    if(mMaskStateDirty)
2669    {
2670		device->setColorWriteMask(0, es2sw::ConvertColorMask(mState.colorMaskRed, mState.colorMaskGreen, mState.colorMaskBlue, mState.colorMaskAlpha));
2671		device->setDepthWriteEnable(mState.depthMask);
2672
2673        mMaskStateDirty = false;
2674    }
2675
2676    if(mPolygonOffsetStateDirty)
2677    {
2678        if(mState.polygonOffsetFill)
2679        {
2680            Renderbuffer *depthbuffer = framebuffer->getDepthbuffer();
2681            if(depthbuffer)
2682            {
2683				device->setSlopeDepthBias(mState.polygonOffsetFactor);
2684                float depthBias = ldexp(mState.polygonOffsetUnits, -(int)(depthbuffer->getDepthSize()));
2685				device->setDepthBias(depthBias);
2686            }
2687        }
2688        else
2689        {
2690            device->setSlopeDepthBias(0);
2691            device->setDepthBias(0);
2692        }
2693
2694        mPolygonOffsetStateDirty = false;
2695    }
2696
2697    if(mSampleStateDirty)
2698    {
2699        if(mState.sampleAlphaToCoverage)
2700        {
2701            device->setTransparencyAntialiasing(sw::TRANSPARENCY_ALPHA_TO_COVERAGE);
2702        }
2703		else
2704		{
2705			device->setTransparencyAntialiasing(sw::TRANSPARENCY_NONE);
2706		}
2707
2708        if(mState.sampleCoverage)
2709        {
2710            unsigned int mask = 0;
2711            if(mState.sampleCoverageValue != 0)
2712            {
2713				int width, height, samples;
2714				framebuffer->completeness(width, height, samples);
2715
2716                float threshold = 0.5f;
2717
2718                for(int i = 0; i < samples; i++)
2719                {
2720                    mask <<= 1;
2721
2722                    if((i + 1) * mState.sampleCoverageValue >= threshold)
2723                    {
2724                        threshold += 1.0f;
2725                        mask |= 1;
2726                    }
2727                }
2728            }
2729
2730            if(mState.sampleCoverageInvert)
2731            {
2732                mask = ~mask;
2733            }
2734
2735			device->setMultiSampleMask(mask);
2736        }
2737        else
2738        {
2739			device->setMultiSampleMask(0xFFFFFFFF);
2740        }
2741
2742        mSampleStateDirty = false;
2743    }
2744
2745    if(mDitherStateDirty)
2746    {
2747    //	UNIMPLEMENTED();   // FIXME
2748
2749        mDitherStateDirty = false;
2750    }
2751}
2752
2753GLenum Context::applyVertexBuffer(GLint base, GLint first, GLsizei count, GLsizei instanceId)
2754{
2755    TranslatedAttribute attributes[MAX_VERTEX_ATTRIBS];
2756
2757    GLenum err = mVertexDataManager->prepareVertexData(first, count, attributes, instanceId);
2758    if(err != GL_NO_ERROR)
2759    {
2760        return err;
2761    }
2762
2763	Program *program = getCurrentProgram();
2764
2765	device->resetInputStreams(false);
2766
2767    for(int i = 0; i < MAX_VERTEX_ATTRIBS; i++)
2768	{
2769		if(program->getAttributeStream(i) == -1)
2770		{
2771			continue;
2772		}
2773
2774		sw::Resource *resource = attributes[i].vertexBuffer;
2775		const void *buffer = (char*)resource->data() + attributes[i].offset;
2776
2777		int stride = attributes[i].stride;
2778
2779		buffer = (char*)buffer + stride * base;
2780
2781		sw::Stream attribute(resource, buffer, stride);
2782
2783		attribute.type = attributes[i].type;
2784		attribute.count = attributes[i].count;
2785		attribute.normalized = attributes[i].normalized;
2786
2787		int stream = program->getAttributeStream(i);
2788		device->setInputStream(stream, attribute);
2789	}
2790
2791	return GL_NO_ERROR;
2792}
2793
2794// Applies the indices and element array bindings
2795GLenum Context::applyIndexBuffer(const void *indices, GLuint start, GLuint end, GLsizei count, GLenum mode, GLenum type, TranslatedIndexData *indexInfo)
2796{
2797	GLenum err = mIndexDataManager->prepareIndexData(type, start, end, count, getCurrentVertexArray()->getElementArrayBuffer(), indices, indexInfo);
2798
2799    if(err == GL_NO_ERROR)
2800    {
2801        device->setIndexBuffer(indexInfo->indexBuffer);
2802    }
2803
2804    return err;
2805}
2806
2807// Applies the shaders and shader constants
2808void Context::applyShaders()
2809{
2810    Program *programObject = getCurrentProgram();
2811    sw::VertexShader *vertexShader = programObject->getVertexShader();
2812	sw::PixelShader *pixelShader = programObject->getPixelShader();
2813
2814    device->setVertexShader(vertexShader);
2815    device->setPixelShader(pixelShader);
2816
2817    if(programObject->getSerial() != mAppliedProgramSerial)
2818    {
2819        programObject->dirtyAllUniforms();
2820        mAppliedProgramSerial = programObject->getSerial();
2821    }
2822
2823    programObject->applyUniforms();
2824}
2825
2826void Context::applyTextures()
2827{
2828    applyTextures(sw::SAMPLER_PIXEL);
2829	applyTextures(sw::SAMPLER_VERTEX);
2830}
2831
2832void Context::applyTextures(sw::SamplerType samplerType)
2833{
2834    Program *programObject = getCurrentProgram();
2835
2836    int samplerCount = (samplerType == sw::SAMPLER_PIXEL) ? MAX_TEXTURE_IMAGE_UNITS : MAX_VERTEX_TEXTURE_IMAGE_UNITS;   // Range of samplers of given sampler type
2837
2838    for(int samplerIndex = 0; samplerIndex < samplerCount; samplerIndex++)
2839    {
2840        int textureUnit = programObject->getSamplerMapping(samplerType, samplerIndex);   // OpenGL texture image unit index
2841
2842        if(textureUnit != -1)
2843        {
2844            TextureType textureType = programObject->getSamplerTextureType(samplerType, samplerIndex);
2845
2846            Texture *texture = getSamplerTexture(textureUnit, textureType);
2847
2848			if(texture->isSamplerComplete())
2849            {
2850                GLenum wrapS = texture->getWrapS();
2851                GLenum wrapT = texture->getWrapT();
2852				GLenum wrapR = texture->getWrapR();
2853                GLenum texFilter = texture->getMinFilter();
2854                GLenum magFilter = texture->getMagFilter();
2855				GLfloat maxAnisotropy = texture->getMaxAnisotropy();
2856
2857				device->setAddressingModeU(samplerType, samplerIndex, es2sw::ConvertTextureWrap(wrapS));
2858				device->setAddressingModeV(samplerType, samplerIndex, es2sw::ConvertTextureWrap(wrapT));
2859				device->setAddressingModeW(samplerType, samplerIndex, es2sw::ConvertTextureWrap(wrapR));
2860
2861				sw::FilterType minFilter;
2862				sw::MipmapType mipFilter;
2863                es2sw::ConvertMinFilter(texFilter, &minFilter, &mipFilter, maxAnisotropy);
2864			//	ASSERT(minFilter == es2sw::ConvertMagFilter(magFilter));
2865
2866				device->setTextureFilter(samplerType, samplerIndex, minFilter);
2867			//	device->setTextureFilter(samplerType, samplerIndex, es2sw::ConvertMagFilter(magFilter));
2868				device->setMipmapFilter(samplerType, samplerIndex, mipFilter);
2869				device->setMaxAnisotropy(samplerType, samplerIndex, maxAnisotropy);
2870
2871				applyTexture(samplerType, samplerIndex, texture);
2872            }
2873            else
2874            {
2875                applyTexture(samplerType, samplerIndex, 0);
2876            }
2877        }
2878        else
2879        {
2880            applyTexture(samplerType, samplerIndex, NULL);
2881        }
2882    }
2883}
2884
2885void Context::applyTexture(sw::SamplerType type, int index, Texture *baseTexture)
2886{
2887	Program *program = getCurrentProgram();
2888	int sampler = (type == sw::SAMPLER_PIXEL) ? index : 16 + index;
2889	bool textureUsed = false;
2890
2891	if(type == sw::SAMPLER_PIXEL)
2892	{
2893		textureUsed = program->getPixelShader()->usesSampler(index);
2894	}
2895	else if(type == sw::SAMPLER_VERTEX)
2896	{
2897		textureUsed = program->getVertexShader()->usesSampler(index);
2898	}
2899	else UNREACHABLE();
2900
2901	sw::Resource *resource = 0;
2902
2903	if(baseTexture && textureUsed)
2904	{
2905		resource = baseTexture->getResource();
2906	}
2907
2908	device->setTextureResource(sampler, resource);
2909
2910	if(baseTexture && textureUsed)
2911	{
2912		int levelCount = baseTexture->getLevelCount();
2913
2914		if(baseTexture->getTarget() == GL_TEXTURE_2D || baseTexture->getTarget() == GL_TEXTURE_EXTERNAL_OES)
2915		{
2916			Texture2D *texture = static_cast<Texture2D*>(baseTexture);
2917
2918			for(int mipmapLevel = 0; mipmapLevel < MIPMAP_LEVELS; mipmapLevel++)
2919			{
2920				int surfaceLevel = mipmapLevel;
2921
2922				if(surfaceLevel < 0)
2923				{
2924					surfaceLevel = 0;
2925				}
2926				else if(surfaceLevel >= levelCount)
2927				{
2928					surfaceLevel = levelCount - 1;
2929				}
2930
2931				egl::Image *surface = texture->getImage(surfaceLevel);
2932				device->setTextureLevel(sampler, 0, mipmapLevel, surface, sw::TEXTURE_2D);
2933			}
2934		}
2935		else if(baseTexture->getTarget() == GL_TEXTURE_3D_OES)
2936		{
2937			Texture3D *texture = static_cast<Texture3D*>(baseTexture);
2938
2939			for(int mipmapLevel = 0; mipmapLevel < MIPMAP_LEVELS; mipmapLevel++)
2940			{
2941				int surfaceLevel = mipmapLevel;
2942
2943				if(surfaceLevel < 0)
2944				{
2945					surfaceLevel = 0;
2946				}
2947				else if(surfaceLevel >= levelCount)
2948				{
2949					surfaceLevel = levelCount - 1;
2950				}
2951
2952				egl::Image *surface = texture->getImage(surfaceLevel);
2953				device->setTextureLevel(sampler, 0, mipmapLevel, surface, sw::TEXTURE_3D);
2954			}
2955		}
2956		else if(baseTexture->getTarget() == GL_TEXTURE_CUBE_MAP)
2957		{
2958			for(int face = 0; face < 6; face++)
2959			{
2960				TextureCubeMap *cubeTexture = static_cast<TextureCubeMap*>(baseTexture);
2961
2962				for(int mipmapLevel = 0; mipmapLevel < MIPMAP_LEVELS; mipmapLevel++)
2963				{
2964					int surfaceLevel = mipmapLevel;
2965
2966					if(surfaceLevel < 0)
2967					{
2968						surfaceLevel = 0;
2969					}
2970					else if(surfaceLevel >= levelCount)
2971					{
2972						surfaceLevel = levelCount - 1;
2973					}
2974
2975					egl::Image *surface = cubeTexture->getImage(face, surfaceLevel);
2976					device->setTextureLevel(sampler, face, mipmapLevel, surface, sw::TEXTURE_CUBE);
2977				}
2978			}
2979		}
2980		else UNIMPLEMENTED();
2981	}
2982	else
2983	{
2984		device->setTextureLevel(sampler, 0, 0, 0, sw::TEXTURE_NULL);
2985	}
2986}
2987
2988void Context::readPixels(GLint x, GLint y, GLsizei width, GLsizei height,
2989                         GLenum format, GLenum type, GLsizei *bufSize, void* pixels)
2990{
2991    Framebuffer *framebuffer = getReadFramebuffer();
2992	int framebufferWidth, framebufferHeight, framebufferSamples;
2993
2994    if(framebuffer->completeness(framebufferWidth, framebufferHeight, framebufferSamples) != GL_FRAMEBUFFER_COMPLETE)
2995    {
2996        return error(GL_INVALID_FRAMEBUFFER_OPERATION);
2997    }
2998
2999    if(getReadFramebufferName() != 0 && framebufferSamples != 0)
3000    {
3001        return error(GL_INVALID_OPERATION);
3002    }
3003
3004	if(format != GL_RGBA || type != GL_UNSIGNED_BYTE)
3005	{
3006		if(format != framebuffer->getImplementationColorReadFormat() || type != framebuffer->getImplementationColorReadType())
3007		{
3008			return error(GL_INVALID_OPERATION);
3009		}
3010	}
3011
3012	GLsizei outputPitch = egl::ComputePitch(width, format, type, mState.packAlignment);
3013
3014	// Sized query sanity check
3015    if(bufSize)
3016    {
3017        int requiredSize = outputPitch * height;
3018        if(requiredSize > *bufSize)
3019        {
3020            return error(GL_INVALID_OPERATION);
3021        }
3022    }
3023
3024    egl::Image *renderTarget = framebuffer->getRenderTarget(0);
3025
3026    if(!renderTarget)
3027    {
3028        return error(GL_OUT_OF_MEMORY);
3029    }
3030
3031	sw::Rect rect = {x, y, x + width, y + height};
3032	rect.clip(0, 0, renderTarget->getWidth(), renderTarget->getHeight());
3033
3034    unsigned char *source = (unsigned char*)renderTarget->lock(rect.x0, rect.y0, sw::LOCK_READONLY);
3035    unsigned char *dest = (unsigned char*)pixels;
3036    int inputPitch = (int)renderTarget->getPitch();
3037
3038    for(int j = 0; j < rect.y1 - rect.y0; j++)
3039    {
3040		unsigned short *dest16 = (unsigned short*)dest;
3041		unsigned int *dest32 = (unsigned int*)dest;
3042
3043		if(renderTarget->getInternalFormat() == sw::FORMAT_A8B8G8R8 &&
3044           format == GL_RGBA && type == GL_UNSIGNED_BYTE)
3045        {
3046            memcpy(dest, source, (rect.x1 - rect.x0) * 4);
3047        }
3048		else if(renderTarget->getInternalFormat() == sw::FORMAT_A8R8G8B8 &&
3049                format == GL_RGBA && type == GL_UNSIGNED_BYTE)
3050        {
3051            for(int i = 0; i < rect.x1 - rect.x0; i++)
3052			{
3053				unsigned int argb = *(unsigned int*)(source + 4 * i);
3054
3055				dest32[i] = (argb & 0xFF00FF00) | ((argb & 0x000000FF) << 16) | ((argb & 0x00FF0000) >> 16);
3056			}
3057        }
3058		else if(renderTarget->getInternalFormat() == sw::FORMAT_X8R8G8B8 &&
3059                format == GL_RGBA && type == GL_UNSIGNED_BYTE)
3060        {
3061            for(int i = 0; i < rect.x1 - rect.x0; i++)
3062			{
3063				unsigned int xrgb = *(unsigned int*)(source + 4 * i);
3064
3065				dest32[i] = (xrgb & 0xFF00FF00) | ((xrgb & 0x000000FF) << 16) | ((xrgb & 0x00FF0000) >> 16) | 0xFF000000;
3066			}
3067        }
3068		else if(renderTarget->getInternalFormat() == sw::FORMAT_X8R8G8B8 &&
3069                format == GL_BGRA_EXT && type == GL_UNSIGNED_BYTE)
3070        {
3071            for(int i = 0; i < rect.x1 - rect.x0; i++)
3072			{
3073				unsigned int xrgb = *(unsigned int*)(source + 4 * i);
3074
3075				dest32[i] = xrgb | 0xFF000000;
3076			}
3077        }
3078        else if(renderTarget->getInternalFormat() == sw::FORMAT_A8R8G8B8 &&
3079                format == GL_BGRA_EXT && type == GL_UNSIGNED_BYTE)
3080        {
3081            memcpy(dest, source, (rect.x1 - rect.x0) * 4);
3082        }
3083		else if(renderTarget->getInternalFormat() == sw::FORMAT_A16B16G16R16F &&
3084                format == GL_RGBA && type == GL_HALF_FLOAT_OES)
3085        {
3086            memcpy(dest, source, (rect.x1 - rect.x0) * 8);
3087        }
3088		else if(renderTarget->getInternalFormat() == sw::FORMAT_A32B32G32R32F &&
3089                format == GL_RGBA && type == GL_FLOAT)
3090        {
3091            memcpy(dest, source, (rect.x1 - rect.x0) * 16);
3092        }
3093		else if(renderTarget->getInternalFormat() == sw::FORMAT_A1R5G5B5 &&
3094                format == GL_BGRA_EXT && type == GL_UNSIGNED_SHORT_1_5_5_5_REV_EXT)
3095        {
3096            memcpy(dest, source, (rect.x1 - rect.x0) * 2);
3097        }
3098		else if(renderTarget->getInternalFormat() == sw::FORMAT_R5G6B5 &&
3099                format == 0x80E0 && type == GL_UNSIGNED_SHORT_5_6_5)   // GL_BGR_EXT
3100        {
3101            memcpy(dest, source, (rect.x1 - rect.x0) * 2);
3102        }
3103		else
3104		{
3105			for(int i = 0; i < rect.x1 - rect.x0; i++)
3106			{
3107				float r;
3108				float g;
3109				float b;
3110				float a;
3111
3112				switch(renderTarget->getInternalFormat())
3113				{
3114				case sw::FORMAT_R5G6B5:
3115					{
3116						unsigned short rgb = *(unsigned short*)(source + 2 * i);
3117
3118						a = 1.0f;
3119						b = (rgb & 0x001F) * (1.0f / 0x001F);
3120						g = (rgb & 0x07E0) * (1.0f / 0x07E0);
3121						r = (rgb & 0xF800) * (1.0f / 0xF800);
3122					}
3123					break;
3124				case sw::FORMAT_A1R5G5B5:
3125					{
3126						unsigned short argb = *(unsigned short*)(source + 2 * i);
3127
3128						a = (argb & 0x8000) ? 1.0f : 0.0f;
3129						b = (argb & 0x001F) * (1.0f / 0x001F);
3130						g = (argb & 0x03E0) * (1.0f / 0x03E0);
3131						r = (argb & 0x7C00) * (1.0f / 0x7C00);
3132					}
3133					break;
3134				case sw::FORMAT_A8R8G8B8:
3135					{
3136						unsigned int argb = *(unsigned int*)(source + 4 * i);
3137
3138						a = (argb & 0xFF000000) * (1.0f / 0xFF000000);
3139						b = (argb & 0x000000FF) * (1.0f / 0x000000FF);
3140						g = (argb & 0x0000FF00) * (1.0f / 0x0000FF00);
3141						r = (argb & 0x00FF0000) * (1.0f / 0x00FF0000);
3142					}
3143					break;
3144				case sw::FORMAT_A8B8G8R8:
3145					{
3146						unsigned int abgr = *(unsigned int*)(source + 4 * i);
3147
3148						a = (abgr & 0xFF000000) * (1.0f / 0xFF000000);
3149						b = (abgr & 0x00FF0000) * (1.0f / 0x00FF0000);
3150						g = (abgr & 0x0000FF00) * (1.0f / 0x0000FF00);
3151						r = (abgr & 0x000000FF) * (1.0f / 0x000000FF);
3152					}
3153					break;
3154				case sw::FORMAT_X8R8G8B8:
3155					{
3156						unsigned int xrgb = *(unsigned int*)(source + 4 * i);
3157
3158						a = 1.0f;
3159						b = (xrgb & 0x000000FF) * (1.0f / 0x000000FF);
3160						g = (xrgb & 0x0000FF00) * (1.0f / 0x0000FF00);
3161						r = (xrgb & 0x00FF0000) * (1.0f / 0x00FF0000);
3162					}
3163					break;
3164				case sw::FORMAT_X8B8G8R8:
3165					{
3166						unsigned int xbgr = *(unsigned int*)(source + 4 * i);
3167
3168						a = 1.0f;
3169						b = (xbgr & 0x00FF0000) * (1.0f / 0x00FF0000);
3170						g = (xbgr & 0x0000FF00) * (1.0f / 0x0000FF00);
3171						r = (xbgr & 0x000000FF) * (1.0f / 0x000000FF);
3172					}
3173					break;
3174				case sw::FORMAT_A2R10G10B10:
3175					{
3176						unsigned int argb = *(unsigned int*)(source + 4 * i);
3177
3178						a = (argb & 0xC0000000) * (1.0f / 0xC0000000);
3179						b = (argb & 0x000003FF) * (1.0f / 0x000003FF);
3180						g = (argb & 0x000FFC00) * (1.0f / 0x000FFC00);
3181						r = (argb & 0x3FF00000) * (1.0f / 0x3FF00000);
3182					}
3183					break;
3184				case sw::FORMAT_A32B32G32R32F:
3185					{
3186						r = *((float*)(source + 16 * i) + 0);
3187						g = *((float*)(source + 16 * i) + 1);
3188						b = *((float*)(source + 16 * i) + 2);
3189						a = *((float*)(source + 16 * i) + 3);
3190					}
3191					break;
3192				case sw::FORMAT_A16B16G16R16F:
3193					{
3194						r = (float)*((sw::half*)(source + 8 * i) + 0);
3195						g = (float)*((sw::half*)(source + 8 * i) + 1);
3196						b = (float)*((sw::half*)(source + 8 * i) + 2);
3197						a = (float)*((sw::half*)(source + 8 * i) + 3);
3198					}
3199					break;
3200				default:
3201					UNIMPLEMENTED();   // FIXME
3202					UNREACHABLE();
3203				}
3204
3205				switch(format)
3206				{
3207				case GL_RGBA:
3208					switch(type)
3209					{
3210					case GL_UNSIGNED_BYTE:
3211						dest[4 * i + 0] = (unsigned char)(255 * r + 0.5f);
3212						dest[4 * i + 1] = (unsigned char)(255 * g + 0.5f);
3213						dest[4 * i + 2] = (unsigned char)(255 * b + 0.5f);
3214						dest[4 * i + 3] = (unsigned char)(255 * a + 0.5f);
3215						break;
3216					default: UNREACHABLE();
3217					}
3218					break;
3219				case GL_BGRA_EXT:
3220					switch(type)
3221					{
3222					case GL_UNSIGNED_BYTE:
3223						dest[4 * i + 0] = (unsigned char)(255 * b + 0.5f);
3224						dest[4 * i + 1] = (unsigned char)(255 * g + 0.5f);
3225						dest[4 * i + 2] = (unsigned char)(255 * r + 0.5f);
3226						dest[4 * i + 3] = (unsigned char)(255 * a + 0.5f);
3227						break;
3228					case GL_UNSIGNED_SHORT_4_4_4_4_REV_EXT:
3229						// According to the desktop GL spec in the "Transfer of Pixel Rectangles" section
3230						// this type is packed as follows:
3231						//   15   14   13   12   11   10    9    8    7    6    5    4    3    2    1    0
3232						//  --------------------------------------------------------------------------------
3233						// |       4th         |        3rd         |        2nd        |   1st component   |
3234						//  --------------------------------------------------------------------------------
3235						// in the case of BGRA_EXT, B is the first component, G the second, and so forth.
3236						dest16[i] =
3237							((unsigned short)(15 * a + 0.5f) << 12)|
3238							((unsigned short)(15 * r + 0.5f) << 8) |
3239							((unsigned short)(15 * g + 0.5f) << 4) |
3240							((unsigned short)(15 * b + 0.5f) << 0);
3241						break;
3242					case GL_UNSIGNED_SHORT_1_5_5_5_REV_EXT:
3243						// According to the desktop GL spec in the "Transfer of Pixel Rectangles" section
3244						// this type is packed as follows:
3245						//   15   14   13   12   11   10    9    8    7    6    5    4    3    2    1    0
3246						//  --------------------------------------------------------------------------------
3247						// | 4th |          3rd           |           2nd          |      1st component     |
3248						//  --------------------------------------------------------------------------------
3249						// in the case of BGRA_EXT, B is the first component, G the second, and so forth.
3250						dest16[i] =
3251							((unsigned short)(     a + 0.5f) << 15) |
3252							((unsigned short)(31 * r + 0.5f) << 10) |
3253							((unsigned short)(31 * g + 0.5f) << 5) |
3254							((unsigned short)(31 * b + 0.5f) << 0);
3255						break;
3256					default: UNREACHABLE();
3257					}
3258					break;
3259				case GL_RGB:
3260					switch(type)
3261					{
3262					case GL_UNSIGNED_SHORT_5_6_5:
3263						dest16[i] =
3264							((unsigned short)(31 * b + 0.5f) << 0) |
3265							((unsigned short)(63 * g + 0.5f) << 5) |
3266							((unsigned short)(31 * r + 0.5f) << 11);
3267						break;
3268					default: UNREACHABLE();
3269					}
3270					break;
3271				default: UNREACHABLE();
3272				}
3273			}
3274        }
3275
3276		source += inputPitch;
3277		dest += outputPitch;
3278    }
3279
3280	renderTarget->unlock();
3281	renderTarget->release();
3282}
3283
3284void Context::clear(GLbitfield mask)
3285{
3286    Framebuffer *framebuffer = getDrawFramebuffer();
3287
3288    if(!framebuffer || framebuffer->completeness() != GL_FRAMEBUFFER_COMPLETE)
3289    {
3290        return error(GL_INVALID_FRAMEBUFFER_OPERATION);
3291    }
3292
3293    if(!applyRenderTarget())
3294    {
3295        return;
3296    }
3297
3298	unsigned int color = (unorm<8>(mState.colorClearValue.alpha) << 24) |
3299                         (unorm<8>(mState.colorClearValue.red) << 16) |
3300                         (unorm<8>(mState.colorClearValue.green) << 8) |
3301                         (unorm<8>(mState.colorClearValue.blue) << 0);
3302    float depth = clamp01(mState.depthClearValue);
3303    int stencil = mState.stencilClearValue & 0x000000FF;
3304
3305	if(mask & GL_COLOR_BUFFER_BIT)
3306	{
3307		unsigned int rgbaMask = (mState.colorMaskRed ? 0x1 : 0) |
3308		                        (mState.colorMaskGreen ? 0x2 : 0) |
3309		                        (mState.colorMaskBlue ? 0x4 : 0) |
3310		                        (mState.colorMaskAlpha ? 0x8 : 0);
3311
3312		if(rgbaMask != 0)
3313		{
3314			device->clearColor(color, rgbaMask);
3315		}
3316	}
3317
3318	if(mask & GL_DEPTH_BUFFER_BIT)
3319	{
3320		if(mState.depthMask != 0)
3321		{
3322			device->clearDepth(depth);
3323		}
3324	}
3325
3326	if(mask & GL_STENCIL_BUFFER_BIT)
3327	{
3328		if(mState.stencilWritemask != 0)
3329		{
3330			device->clearStencil(stencil, mState.stencilWritemask);
3331		}
3332	}
3333}
3334
3335void Context::drawArrays(GLenum mode, GLint first, GLsizei count, GLsizei instanceCount)
3336{
3337    if(!mState.currentProgram)
3338    {
3339        return error(GL_INVALID_OPERATION);
3340    }
3341
3342    PrimitiveType primitiveType;
3343    int primitiveCount;
3344
3345    if(!es2sw::ConvertPrimitiveType(mode, count, primitiveType, primitiveCount))
3346        return error(GL_INVALID_ENUM);
3347
3348    if(primitiveCount <= 0)
3349    {
3350        return;
3351    }
3352
3353    if(!applyRenderTarget())
3354    {
3355        return;
3356    }
3357
3358    applyState(mode);
3359
3360	for(int i = 0; i < instanceCount; ++i)
3361	{
3362		GLenum err = applyVertexBuffer(0, first, count, i);
3363		if(err != GL_NO_ERROR)
3364		{
3365			return error(err);
3366		}
3367
3368		applyShaders();
3369		applyTextures();
3370
3371		if(!getCurrentProgram()->validateSamplers(false))
3372		{
3373			return error(GL_INVALID_OPERATION);
3374		}
3375
3376		if(!cullSkipsDraw(mode))
3377		{
3378			device->drawPrimitive(primitiveType, primitiveCount);
3379		}
3380	}
3381}
3382
3383void Context::drawElements(GLenum mode, GLuint start, GLuint end, GLsizei count, GLenum type, const void *indices, GLsizei instanceCount)
3384{
3385    if(!mState.currentProgram)
3386    {
3387        return error(GL_INVALID_OPERATION);
3388    }
3389
3390	if(!indices && !getCurrentVertexArray()->getElementArrayBuffer())
3391    {
3392        return error(GL_INVALID_OPERATION);
3393    }
3394
3395    PrimitiveType primitiveType;
3396    int primitiveCount;
3397
3398    if(!es2sw::ConvertPrimitiveType(mode, count, primitiveType, primitiveCount))
3399        return error(GL_INVALID_ENUM);
3400
3401    if(primitiveCount <= 0)
3402    {
3403        return;
3404    }
3405
3406    if(!applyRenderTarget())
3407    {
3408        return;
3409    }
3410
3411    applyState(mode);
3412
3413	for(int i = 0; i < instanceCount; ++i)
3414	{
3415		TranslatedIndexData indexInfo;
3416		GLenum err = applyIndexBuffer(indices, start, end, count, mode, type, &indexInfo);
3417		if(err != GL_NO_ERROR)
3418		{
3419			return error(err);
3420		}
3421
3422		GLsizei vertexCount = indexInfo.maxIndex - indexInfo.minIndex + 1;
3423		err = applyVertexBuffer(-(int)indexInfo.minIndex, indexInfo.minIndex, vertexCount, i);
3424		if(err != GL_NO_ERROR)
3425		{
3426			return error(err);
3427		}
3428
3429		applyShaders();
3430		applyTextures();
3431
3432		if(!getCurrentProgram()->validateSamplers(false))
3433		{
3434			return error(GL_INVALID_OPERATION);
3435		}
3436
3437		if(!cullSkipsDraw(mode))
3438		{
3439			device->drawIndexedPrimitive(primitiveType, indexInfo.indexOffset, primitiveCount, IndexDataManager::typeSize(type));
3440		}
3441	}
3442}
3443
3444void Context::finish()
3445{
3446	device->finish();
3447}
3448
3449void Context::flush()
3450{
3451    // We don't queue anything without processing it as fast as possible
3452}
3453
3454void Context::recordInvalidEnum()
3455{
3456    mInvalidEnum = true;
3457}
3458
3459void Context::recordInvalidValue()
3460{
3461    mInvalidValue = true;
3462}
3463
3464void Context::recordInvalidOperation()
3465{
3466    mInvalidOperation = true;
3467}
3468
3469void Context::recordOutOfMemory()
3470{
3471    mOutOfMemory = true;
3472}
3473
3474void Context::recordInvalidFramebufferOperation()
3475{
3476    mInvalidFramebufferOperation = true;
3477}
3478
3479// Get one of the recorded errors and clear its flag, if any.
3480// [OpenGL ES 2.0.24] section 2.5 page 13.
3481GLenum Context::getError()
3482{
3483    if(mInvalidEnum)
3484    {
3485        mInvalidEnum = false;
3486
3487        return GL_INVALID_ENUM;
3488    }
3489
3490    if(mInvalidValue)
3491    {
3492        mInvalidValue = false;
3493
3494        return GL_INVALID_VALUE;
3495    }
3496
3497    if(mInvalidOperation)
3498    {
3499        mInvalidOperation = false;
3500
3501        return GL_INVALID_OPERATION;
3502    }
3503
3504    if(mOutOfMemory)
3505    {
3506        mOutOfMemory = false;
3507
3508        return GL_OUT_OF_MEMORY;
3509    }
3510
3511    if(mInvalidFramebufferOperation)
3512    {
3513        mInvalidFramebufferOperation = false;
3514
3515        return GL_INVALID_FRAMEBUFFER_OPERATION;
3516    }
3517
3518    return GL_NO_ERROR;
3519}
3520
3521int Context::getSupportedMultiSampleDepth(sw::Format format, int requested)
3522{
3523    if(requested <= 1)
3524    {
3525        return 1;
3526    }
3527
3528	if(requested == 2)
3529	{
3530		return 2;
3531	}
3532
3533	return 4;
3534}
3535
3536void Context::detachBuffer(GLuint buffer)
3537{
3538    // [OpenGL ES 2.0.24] section 2.9 page 22:
3539    // If a buffer object is deleted while it is bound, all bindings to that object in the current context
3540    // (i.e. in the thread that called Delete-Buffers) are reset to zero.
3541
3542    if(getArrayBufferName() == buffer)
3543    {
3544        mState.arrayBuffer = NULL;
3545    }
3546
3547	for(auto vaoIt = mVertexArrayMap.begin(); vaoIt != mVertexArrayMap.end(); vaoIt++)
3548	{
3549		vaoIt->second->detachBuffer(buffer);
3550	}
3551
3552    for(int attribute = 0; attribute < MAX_VERTEX_ATTRIBS; attribute++)
3553    {
3554        if(mState.vertexAttribute[attribute].mBoundBuffer.name() == buffer)
3555        {
3556            mState.vertexAttribute[attribute].mBoundBuffer = NULL;
3557        }
3558    }
3559}
3560
3561void Context::detachTexture(GLuint texture)
3562{
3563    // [OpenGL ES 2.0.24] section 3.8 page 84:
3564    // If a texture object is deleted, it is as if all texture units which are bound to that texture object are
3565    // rebound to texture object zero
3566
3567    for(int type = 0; type < TEXTURE_TYPE_COUNT; type++)
3568    {
3569        for(int sampler = 0; sampler < MAX_COMBINED_TEXTURE_IMAGE_UNITS; sampler++)
3570        {
3571            if(mState.samplerTexture[type][sampler].name() == texture)
3572            {
3573                mState.samplerTexture[type][sampler] = NULL;
3574            }
3575        }
3576    }
3577
3578    // [OpenGL ES 2.0.24] section 4.4 page 112:
3579    // If a texture object is deleted while its image is attached to the currently bound framebuffer, then it is
3580    // as if FramebufferTexture2D had been called, with a texture of 0, for each attachment point to which this
3581    // image was attached in the currently bound framebuffer.
3582
3583    Framebuffer *readFramebuffer = getReadFramebuffer();
3584    Framebuffer *drawFramebuffer = getDrawFramebuffer();
3585
3586    if(readFramebuffer)
3587    {
3588        readFramebuffer->detachTexture(texture);
3589    }
3590
3591    if(drawFramebuffer && drawFramebuffer != readFramebuffer)
3592    {
3593        drawFramebuffer->detachTexture(texture);
3594    }
3595}
3596
3597void Context::detachFramebuffer(GLuint framebuffer)
3598{
3599    // [OpenGL ES 2.0.24] section 4.4 page 107:
3600    // If a framebuffer that is currently bound to the target FRAMEBUFFER is deleted, it is as though
3601    // BindFramebuffer had been executed with the target of FRAMEBUFFER and framebuffer of zero.
3602
3603    if(mState.readFramebuffer == framebuffer)
3604    {
3605        bindReadFramebuffer(0);
3606    }
3607
3608    if(mState.drawFramebuffer == framebuffer)
3609    {
3610        bindDrawFramebuffer(0);
3611    }
3612}
3613
3614void Context::detachRenderbuffer(GLuint renderbuffer)
3615{
3616    // [OpenGL ES 2.0.24] section 4.4 page 109:
3617    // If a renderbuffer that is currently bound to RENDERBUFFER is deleted, it is as though BindRenderbuffer
3618    // had been executed with the target RENDERBUFFER and name of zero.
3619
3620    if(mState.renderbuffer.name() == renderbuffer)
3621    {
3622        bindRenderbuffer(0);
3623    }
3624
3625    // [OpenGL ES 2.0.24] section 4.4 page 111:
3626    // If a renderbuffer object is deleted while its image is attached to the currently bound framebuffer,
3627    // then it is as if FramebufferRenderbuffer had been called, with a renderbuffer of 0, for each attachment
3628    // point to which this image was attached in the currently bound framebuffer.
3629
3630    Framebuffer *readFramebuffer = getReadFramebuffer();
3631    Framebuffer *drawFramebuffer = getDrawFramebuffer();
3632
3633    if(readFramebuffer)
3634    {
3635        readFramebuffer->detachRenderbuffer(renderbuffer);
3636    }
3637
3638    if(drawFramebuffer && drawFramebuffer != readFramebuffer)
3639    {
3640        drawFramebuffer->detachRenderbuffer(renderbuffer);
3641    }
3642}
3643
3644bool Context::cullSkipsDraw(GLenum drawMode)
3645{
3646    return mState.cullFace && mState.cullMode == GL_FRONT_AND_BACK && isTriangleMode(drawMode);
3647}
3648
3649bool Context::isTriangleMode(GLenum drawMode)
3650{
3651    switch (drawMode)
3652    {
3653      case GL_TRIANGLES:
3654      case GL_TRIANGLE_FAN:
3655      case GL_TRIANGLE_STRIP:
3656        return true;
3657      case GL_POINTS:
3658      case GL_LINES:
3659      case GL_LINE_LOOP:
3660      case GL_LINE_STRIP:
3661        return false;
3662      default: UNREACHABLE();
3663    }
3664
3665    return false;
3666}
3667
3668void Context::setVertexAttrib(GLuint index, const GLfloat *values)
3669{
3670    ASSERT(index < MAX_VERTEX_ATTRIBS);
3671
3672    mState.vertexAttribute[index].setCurrentValue(values);
3673
3674    mVertexDataManager->dirtyCurrentValue(index);
3675}
3676
3677void Context::setVertexAttrib(GLuint index, const GLint *values)
3678{
3679	ASSERT(index < MAX_VERTEX_ATTRIBS);
3680
3681	mState.vertexAttribute[index].setCurrentValue(values);
3682
3683	mVertexDataManager->dirtyCurrentValue(index);
3684}
3685
3686void Context::setVertexAttrib(GLuint index, const GLuint *values)
3687{
3688	ASSERT(index < MAX_VERTEX_ATTRIBS);
3689
3690	mState.vertexAttribute[index].setCurrentValue(values);
3691
3692	mVertexDataManager->dirtyCurrentValue(index);
3693}
3694
3695void Context::blitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
3696                              GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
3697                              GLbitfield mask)
3698{
3699    Framebuffer *readFramebuffer = getReadFramebuffer();
3700    Framebuffer *drawFramebuffer = getDrawFramebuffer();
3701
3702	int readBufferWidth, readBufferHeight, readBufferSamples;
3703    int drawBufferWidth, drawBufferHeight, drawBufferSamples;
3704
3705    if(!readFramebuffer || readFramebuffer->completeness(readBufferWidth, readBufferHeight, readBufferSamples) != GL_FRAMEBUFFER_COMPLETE ||
3706       !drawFramebuffer || drawFramebuffer->completeness(drawBufferWidth, drawBufferHeight, drawBufferSamples) != GL_FRAMEBUFFER_COMPLETE)
3707    {
3708        return error(GL_INVALID_FRAMEBUFFER_OPERATION);
3709    }
3710
3711    if(drawBufferSamples > 1)
3712    {
3713        return error(GL_INVALID_OPERATION);
3714    }
3715
3716    sw::SliceRect sourceRect;
3717    sw::SliceRect destRect;
3718	bool flipX = (srcX0 < srcX1) ^ (dstX0 < dstX1);
3719	bool flipy = (srcY0 < srcY1) ^ (dstY0 < dstY1);
3720
3721    if(srcX0 < srcX1)
3722    {
3723        sourceRect.x0 = srcX0;
3724        sourceRect.x1 = srcX1;
3725    }
3726    else
3727    {
3728        sourceRect.x0 = srcX1;
3729        sourceRect.x1 = srcX0;
3730    }
3731
3732	if(dstX0 < dstX1)
3733	{
3734		destRect.x0 = dstX0;
3735		destRect.x1 = dstX1;
3736	}
3737	else
3738	{
3739		destRect.x0 = dstX1;
3740		destRect.x1 = dstX0;
3741	}
3742
3743    if(srcY0 < srcY1)
3744    {
3745        sourceRect.y0 = srcY0;
3746        sourceRect.y1 = srcY1;
3747    }
3748    else
3749    {
3750        sourceRect.y0 = srcY1;
3751        sourceRect.y1 = srcY0;
3752    }
3753
3754	if(dstY0 < dstY1)
3755	{
3756		destRect.y0 = dstY0;
3757		destRect.y1 = dstY1;
3758	}
3759	else
3760	{
3761		destRect.y0 = dstY1;
3762		destRect.y1 = dstY0;
3763	}
3764
3765	sw::Rect sourceScissoredRect = sourceRect;
3766    sw::Rect destScissoredRect = destRect;
3767
3768    if(mState.scissorTest)   // Only write to parts of the destination framebuffer which pass the scissor test
3769    {
3770        if(destRect.x0 < mState.scissorX)
3771        {
3772            int xDiff = mState.scissorX - destRect.x0;
3773            destScissoredRect.x0 = mState.scissorX;
3774            sourceScissoredRect.x0 += xDiff;
3775        }
3776
3777        if(destRect.x1 > mState.scissorX + mState.scissorWidth)
3778        {
3779            int xDiff = destRect.x1 - (mState.scissorX + mState.scissorWidth);
3780            destScissoredRect.x1 = mState.scissorX + mState.scissorWidth;
3781            sourceScissoredRect.x1 -= xDiff;
3782        }
3783
3784        if(destRect.y0 < mState.scissorY)
3785        {
3786            int yDiff = mState.scissorY - destRect.y0;
3787            destScissoredRect.y0 = mState.scissorY;
3788            sourceScissoredRect.y0 += yDiff;
3789        }
3790
3791        if(destRect.y1 > mState.scissorY + mState.scissorHeight)
3792        {
3793            int yDiff = destRect.y1 - (mState.scissorY + mState.scissorHeight);
3794            destScissoredRect.y1 = mState.scissorY + mState.scissorHeight;
3795            sourceScissoredRect.y1 -= yDiff;
3796        }
3797    }
3798
3799    sw::Rect sourceTrimmedRect = sourceScissoredRect;
3800    sw::Rect destTrimmedRect = destScissoredRect;
3801
3802    // The source & destination rectangles also may need to be trimmed if they fall out of the bounds of
3803    // the actual draw and read surfaces.
3804    if(sourceTrimmedRect.x0 < 0)
3805    {
3806        int xDiff = 0 - sourceTrimmedRect.x0;
3807        sourceTrimmedRect.x0 = 0;
3808        destTrimmedRect.x0 += xDiff;
3809    }
3810
3811    if(sourceTrimmedRect.x1 > readBufferWidth)
3812    {
3813        int xDiff = sourceTrimmedRect.x1 - readBufferWidth;
3814        sourceTrimmedRect.x1 = readBufferWidth;
3815        destTrimmedRect.x1 -= xDiff;
3816    }
3817
3818    if(sourceTrimmedRect.y0 < 0)
3819    {
3820        int yDiff = 0 - sourceTrimmedRect.y0;
3821        sourceTrimmedRect.y0 = 0;
3822        destTrimmedRect.y0 += yDiff;
3823    }
3824
3825    if(sourceTrimmedRect.y1 > readBufferHeight)
3826    {
3827        int yDiff = sourceTrimmedRect.y1 - readBufferHeight;
3828        sourceTrimmedRect.y1 = readBufferHeight;
3829        destTrimmedRect.y1 -= yDiff;
3830    }
3831
3832    if(destTrimmedRect.x0 < 0)
3833    {
3834        int xDiff = 0 - destTrimmedRect.x0;
3835        destTrimmedRect.x0 = 0;
3836        sourceTrimmedRect.x0 += xDiff;
3837    }
3838
3839    if(destTrimmedRect.x1 > drawBufferWidth)
3840    {
3841        int xDiff = destTrimmedRect.x1 - drawBufferWidth;
3842        destTrimmedRect.x1 = drawBufferWidth;
3843        sourceTrimmedRect.x1 -= xDiff;
3844    }
3845
3846    if(destTrimmedRect.y0 < 0)
3847    {
3848        int yDiff = 0 - destTrimmedRect.y0;
3849        destTrimmedRect.y0 = 0;
3850        sourceTrimmedRect.y0 += yDiff;
3851    }
3852
3853    if(destTrimmedRect.y1 > drawBufferHeight)
3854    {
3855        int yDiff = destTrimmedRect.y1 - drawBufferHeight;
3856        destTrimmedRect.y1 = drawBufferHeight;
3857        sourceTrimmedRect.y1 -= yDiff;
3858    }
3859
3860    bool partialBufferCopy = false;
3861
3862    if(sourceTrimmedRect.y1 - sourceTrimmedRect.y0 < readBufferHeight ||
3863       sourceTrimmedRect.x1 - sourceTrimmedRect.x0 < readBufferWidth ||
3864       destTrimmedRect.y1 - destTrimmedRect.y0 < drawBufferHeight ||
3865       destTrimmedRect.x1 - destTrimmedRect.x0 < drawBufferWidth ||
3866       sourceTrimmedRect.y0 != 0 || destTrimmedRect.y0 != 0 || sourceTrimmedRect.x0 != 0 || destTrimmedRect.x0 != 0)
3867    {
3868        partialBufferCopy = true;
3869    }
3870
3871	bool blitRenderTarget = false;
3872    bool blitDepthStencil = false;
3873
3874    if(mask & GL_COLOR_BUFFER_BIT)
3875    {
3876        const bool validReadType = readFramebuffer->getColorbufferType(getReadFramebufferColorIndex()) == GL_TEXTURE_2D ||
3877                                   readFramebuffer->getColorbufferType(getReadFramebufferColorIndex()) == GL_RENDERBUFFER;
3878        const bool validDrawType = drawFramebuffer->getColorbufferType(0) == GL_TEXTURE_2D ||
3879                                   drawFramebuffer->getColorbufferType(0) == GL_RENDERBUFFER;
3880        if(!validReadType || !validDrawType)
3881        {
3882            return error(GL_INVALID_OPERATION);
3883        }
3884
3885        if(partialBufferCopy && readBufferSamples > 1)
3886        {
3887            return error(GL_INVALID_OPERATION);
3888        }
3889
3890        blitRenderTarget = true;
3891    }
3892
3893    if(mask & (GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT))
3894    {
3895        Renderbuffer *readDSBuffer = NULL;
3896        Renderbuffer *drawDSBuffer = NULL;
3897
3898        // We support OES_packed_depth_stencil, and do not support a separately attached depth and stencil buffer, so if we have
3899        // both a depth and stencil buffer, it will be the same buffer.
3900
3901        if(mask & GL_DEPTH_BUFFER_BIT)
3902        {
3903            if(readFramebuffer->getDepthbuffer() && drawFramebuffer->getDepthbuffer())
3904            {
3905                if(readFramebuffer->getDepthbufferType() != drawFramebuffer->getDepthbufferType())
3906                {
3907                    return error(GL_INVALID_OPERATION);
3908                }
3909
3910                blitDepthStencil = true;
3911                readDSBuffer = readFramebuffer->getDepthbuffer();
3912                drawDSBuffer = drawFramebuffer->getDepthbuffer();
3913            }
3914        }
3915
3916        if(mask & GL_STENCIL_BUFFER_BIT)
3917        {
3918            if(readFramebuffer->getStencilbuffer() && drawFramebuffer->getStencilbuffer())
3919            {
3920                if(readFramebuffer->getStencilbufferType() != drawFramebuffer->getStencilbufferType())
3921                {
3922                    return error(GL_INVALID_OPERATION);
3923                }
3924
3925                blitDepthStencil = true;
3926                readDSBuffer = readFramebuffer->getStencilbuffer();
3927                drawDSBuffer = drawFramebuffer->getStencilbuffer();
3928            }
3929        }
3930
3931        if(partialBufferCopy)
3932        {
3933            ERR("Only whole-buffer depth and stencil blits are supported by this implementation.");
3934            return error(GL_INVALID_OPERATION);   // Only whole-buffer copies are permitted
3935        }
3936
3937        if((drawDSBuffer && drawDSBuffer->getSamples() > 1) ||
3938           (readDSBuffer && readDSBuffer->getSamples() > 1))
3939        {
3940            return error(GL_INVALID_OPERATION);
3941        }
3942    }
3943
3944    if(blitRenderTarget || blitDepthStencil)
3945    {
3946        if(blitRenderTarget)
3947        {
3948            egl::Image *readRenderTarget = readFramebuffer->getReadRenderTarget();
3949            egl::Image *drawRenderTarget = drawFramebuffer->getRenderTarget(0);
3950
3951			if(flipX)
3952			{
3953				swap(destRect.x0, destRect.x1);
3954			}
3955			if(flipy)
3956			{
3957				swap(destRect.y0, destRect.y1);
3958			}
3959
3960            bool success = device->stretchRect(readRenderTarget, &sourceRect, drawRenderTarget, &destRect, false);
3961
3962            readRenderTarget->release();
3963            drawRenderTarget->release();
3964
3965            if(!success)
3966            {
3967                ERR("BlitFramebuffer failed.");
3968                return;
3969            }
3970        }
3971
3972        if(blitDepthStencil)
3973        {
3974            bool success = device->stretchRect(readFramebuffer->getDepthStencil(), NULL, drawFramebuffer->getDepthStencil(), NULL, false);
3975
3976            if(!success)
3977            {
3978                ERR("BlitFramebuffer failed.");
3979                return;
3980            }
3981        }
3982    }
3983}
3984
3985void Context::bindTexImage(egl::Surface *surface)
3986{
3987	es2::Texture2D *textureObject = getTexture2D();
3988
3989    if(textureObject)
3990    {
3991		textureObject->bindTexImage(surface);
3992	}
3993}
3994
3995EGLenum Context::validateSharedImage(EGLenum target, GLuint name, GLuint textureLevel)
3996{
3997    GLenum textureTarget = GL_NONE;
3998
3999    switch(target)
4000    {
4001    case EGL_GL_TEXTURE_2D_KHR:
4002        textureTarget = GL_TEXTURE_2D;
4003        break;
4004    case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_X_KHR:
4005    case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_X_KHR:
4006    case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_Y_KHR:
4007    case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_KHR:
4008    case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_Z_KHR:
4009    case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_KHR:
4010        textureTarget = GL_TEXTURE_CUBE_MAP;
4011        break;
4012    case EGL_GL_RENDERBUFFER_KHR:
4013        break;
4014    default:
4015        return EGL_BAD_PARAMETER;
4016    }
4017
4018    if(textureLevel >= es2::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
4019    {
4020        return EGL_BAD_MATCH;
4021    }
4022
4023    if(textureTarget != GL_NONE)
4024    {
4025        es2::Texture *texture = getTexture(name);
4026
4027        if(!texture || texture->getTarget() != textureTarget)
4028        {
4029            return EGL_BAD_PARAMETER;
4030        }
4031
4032        if(texture->isShared(textureTarget, textureLevel))   // Bound to an EGLSurface or already an EGLImage sibling
4033        {
4034            return EGL_BAD_ACCESS;
4035        }
4036
4037        if(textureLevel != 0 && !texture->isSamplerComplete())
4038        {
4039            return EGL_BAD_PARAMETER;
4040        }
4041
4042        if(textureLevel == 0 && !(texture->isSamplerComplete() && texture->getLevelCount() == 1))
4043        {
4044            return EGL_BAD_PARAMETER;
4045        }
4046    }
4047    else if(target == EGL_GL_RENDERBUFFER_KHR)
4048    {
4049        es2::Renderbuffer *renderbuffer = getRenderbuffer(name);
4050
4051        if(!renderbuffer)
4052        {
4053            return EGL_BAD_PARAMETER;
4054        }
4055
4056        if(renderbuffer->isShared())   // Already an EGLImage sibling
4057        {
4058            return EGL_BAD_ACCESS;
4059        }
4060    }
4061    else UNREACHABLE();
4062
4063	return EGL_SUCCESS;
4064}
4065
4066egl::Image *Context::createSharedImage(EGLenum target, GLuint name, GLuint textureLevel)
4067{
4068	GLenum textureTarget = GL_NONE;
4069
4070    switch(target)
4071    {
4072    case EGL_GL_TEXTURE_2D_KHR:                  textureTarget = GL_TEXTURE_2D;                  break;
4073    case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_X_KHR: textureTarget = GL_TEXTURE_CUBE_MAP_POSITIVE_X; break;
4074    case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_X_KHR: textureTarget = GL_TEXTURE_CUBE_MAP_NEGATIVE_X; break;
4075    case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_Y_KHR: textureTarget = GL_TEXTURE_CUBE_MAP_POSITIVE_Y; break;
4076    case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_KHR: textureTarget = GL_TEXTURE_CUBE_MAP_NEGATIVE_Y; break;
4077    case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_Z_KHR: textureTarget = GL_TEXTURE_CUBE_MAP_POSITIVE_Z; break;
4078    case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_KHR: textureTarget = GL_TEXTURE_CUBE_MAP_NEGATIVE_Z; break;
4079    }
4080
4081    if(textureTarget != GL_NONE)
4082    {
4083        es2::Texture *texture = getTexture(name);
4084
4085        return texture->createSharedImage(textureTarget, textureLevel);
4086    }
4087    else if(target == EGL_GL_RENDERBUFFER_KHR)
4088    {
4089        es2::Renderbuffer *renderbuffer = getRenderbuffer(name);
4090
4091        return renderbuffer->createSharedImage();
4092    }
4093    else UNREACHABLE();
4094
4095	return 0;
4096}
4097
4098Device *Context::getDevice()
4099{
4100	return device;
4101}
4102
4103const GLubyte* Context::getExtensions(GLuint index, GLuint* numExt) const
4104{
4105	// Keep list sorted in following order:
4106	// OES extensions
4107	// EXT extensions
4108	// Vendor extensions
4109	static const GLubyte* extensions[] = {
4110		(const GLubyte*)"GL_OES_compressed_ETC1_RGB8_texture",
4111		(const GLubyte*)"GL_OES_depth_texture",
4112		(const GLubyte*)"GL_OES_depth_texture_cube_map",
4113		(const GLubyte*)"GL_OES_EGL_image",
4114		(const GLubyte*)"GL_OES_EGL_image_external",
4115		(const GLubyte*)"GL_OES_element_index_uint",
4116		(const GLubyte*)"GL_OES_packed_depth_stencil",
4117		(const GLubyte*)"GL_OES_rgb8_rgba8",
4118		(const GLubyte*)"GL_OES_standard_derivatives",
4119		(const GLubyte*)"GL_OES_texture_float",
4120		(const GLubyte*)"GL_OES_texture_float_linear",
4121		(const GLubyte*)"GL_OES_texture_half_float",
4122		(const GLubyte*)"GL_OES_texture_half_float_linear",
4123		(const GLubyte*)"GL_OES_texture_npot",
4124		(const GLubyte*)"GL_OES_texture_3D",
4125		(const GLubyte*)"GL_EXT_blend_minmax",
4126		(const GLubyte*)"GL_EXT_occlusion_query_boolean",
4127		(const GLubyte*)"GL_EXT_read_format_bgra",
4128#if (S3TC_SUPPORT)
4129		(const GLubyte*)"GL_EXT_texture_compression_dxt1",
4130#endif
4131		(const GLubyte*)"GL_EXT_texture_filter_anisotropic",
4132		(const GLubyte*)"GL_EXT_texture_format_BGRA8888",
4133		(const GLubyte*)"GL_ANGLE_framebuffer_blit",
4134		(const GLubyte*)"GL_NV_framebuffer_blit",
4135		(const GLubyte*)"GL_ANGLE_framebuffer_multisample",
4136#if (S3TC_SUPPORT)
4137		(const GLubyte*)"GL_ANGLE_texture_compression_dxt3",
4138		(const GLubyte*)"GL_ANGLE_texture_compression_dxt5",
4139#endif
4140		(const GLubyte*)"GL_NV_fence",
4141		(const GLubyte*)"GL_EXT_instanced_arrays",
4142		(const GLubyte*)"GL_ANGLE_instanced_arrays",
4143	};
4144	static const GLuint numExtensions = sizeof(extensions) / sizeof(*extensions);
4145
4146	if(numExt)
4147	{
4148		*numExt = numExtensions;
4149		return nullptr;
4150	}
4151
4152	if(index == GL_INVALID_INDEX)
4153	{
4154		static GLubyte* extensionsCat = nullptr;
4155		if((extensionsCat == nullptr) && (numExtensions > 0))
4156		{
4157			int totalLength = numExtensions; // 1 space between each extension name + terminating null
4158			for(int i = 0; i < numExtensions; ++i)
4159			{
4160				totalLength += strlen(reinterpret_cast<const char*>(extensions[i]));
4161			}
4162			extensionsCat = new GLubyte[totalLength];
4163			extensionsCat[0] = '\0';
4164			for(int i = 0; i < numExtensions; ++i)
4165			{
4166				if(i != 0)
4167				{
4168					strcat(reinterpret_cast<char*>(extensionsCat), " ");
4169				}
4170				strcat(reinterpret_cast<char*>(extensionsCat), reinterpret_cast<const char*>(extensions[i]));
4171			}
4172		}
4173		return extensionsCat;
4174	}
4175
4176	if(index >= numExtensions)
4177	{
4178		return nullptr;
4179	}
4180
4181	return extensions[index];
4182}
4183
4184}
4185
4186egl::Context *es2CreateContext(const egl::Config *config, const egl::Context *shareContext, int clientVersion)
4187{
4188	ASSERT(!shareContext || shareContext->getClientVersion() == clientVersion);   // Should be checked by eglCreateContext
4189	return new es2::Context(config, static_cast<const es2::Context*>(shareContext), clientVersion);
4190}
4191