GrGLCaps.cpp revision 7839ce1af63bf12fe7b3caa866970bbbb3afb13d 
1/*
2 * Copyright 2012 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8
9#include "GrGLCaps.h"
10#include "GrGLContext.h"
11#include "SkTSearch.h"
12#include "SkTSort.h"
13
14SK_DEFINE_INST_COUNT(GrGLCaps)
15
16GrGLCaps::GrGLCaps() {
17    this->reset();
18}
19
20void GrGLCaps::reset() {
21    INHERITED::reset();
22
23    fVerifiedColorConfigs.reset();
24    fStencilFormats.reset();
25    fStencilVerifiedColorConfigs.reset();
26    fMSFBOType = kNone_MSFBOType;
27    fCoverageAAType = kNone_CoverageAAType;
28    fFBFetchType = kNone_FBFetchType;
29    fMaxFragmentUniformVectors = 0;
30    fMaxVertexAttributes = 0;
31    fRGBA8RenderbufferSupport = false;
32    fBGRAFormatSupport = false;
33    fBGRAIsInternalFormat = false;
34    fTextureSwizzleSupport = false;
35    fUnpackRowLengthSupport = false;
36    fUnpackFlipYSupport = false;
37    fPackRowLengthSupport = false;
38    fPackFlipYSupport = false;
39    fTextureUsageSupport = false;
40    fTexStorageSupport = false;
41    fTextureRedSupport = false;
42    fImagingSupport = false;
43    fTwoFormatLimit = false;
44    fFragCoordsConventionSupport = false;
45    fVertexArrayObjectSupport = false;
46    fUseNonVBOVertexAndIndexDynamicData = false;
47    fIsCoreProfile = false;
48    fDiscardFBSupport = false;
49}
50
51GrGLCaps::GrGLCaps(const GrGLCaps& caps) : GrDrawTargetCaps() {
52    *this = caps;
53}
54
55GrGLCaps& GrGLCaps::operator = (const GrGLCaps& caps) {
56    INHERITED::operator=(caps);
57    fVerifiedColorConfigs = caps.fVerifiedColorConfigs;
58    fStencilFormats = caps.fStencilFormats;
59    fStencilVerifiedColorConfigs = caps.fStencilVerifiedColorConfigs;
60    fMaxFragmentUniformVectors = caps.fMaxFragmentUniformVectors;
61    fMaxVertexAttributes = caps.fMaxVertexAttributes;
62    fMSFBOType = caps.fMSFBOType;
63    fCoverageAAType = caps.fCoverageAAType;
64    fMSAACoverageModes = caps.fMSAACoverageModes;
65    fFBFetchType = caps.fFBFetchType;
66    fRGBA8RenderbufferSupport = caps.fRGBA8RenderbufferSupport;
67    fBGRAFormatSupport = caps.fBGRAFormatSupport;
68    fBGRAIsInternalFormat = caps.fBGRAIsInternalFormat;
69    fTextureSwizzleSupport = caps.fTextureSwizzleSupport;
70    fUnpackRowLengthSupport = caps.fUnpackRowLengthSupport;
71    fUnpackFlipYSupport = caps.fUnpackFlipYSupport;
72    fPackRowLengthSupport = caps.fPackRowLengthSupport;
73    fPackFlipYSupport = caps.fPackFlipYSupport;
74    fTextureUsageSupport = caps.fTextureUsageSupport;
75    fTexStorageSupport = caps.fTexStorageSupport;
76    fTextureRedSupport = caps.fTextureRedSupport;
77    fImagingSupport = caps.fImagingSupport;
78    fTwoFormatLimit = caps.fTwoFormatLimit;
79    fFragCoordsConventionSupport = caps.fFragCoordsConventionSupport;
80    fVertexArrayObjectSupport = caps.fVertexArrayObjectSupport;
81    fUseNonVBOVertexAndIndexDynamicData = caps.fUseNonVBOVertexAndIndexDynamicData;
82    fIsCoreProfile = caps.fIsCoreProfile;
83    fDiscardFBSupport = caps.fDiscardFBSupport;
84
85    return *this;
86}
87
88void GrGLCaps::init(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
89
90    this->reset();
91    if (!ctxInfo.isInitialized()) {
92        return;
93    }
94
95    GrGLBinding binding = ctxInfo.binding();
96    GrGLVersion version = ctxInfo.version();
97
98    /**************************************************************************
99     * Caps specific to GrGLCaps
100     **************************************************************************/
101
102    if (kES2_GrGLBinding == binding) {
103        GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_UNIFORM_VECTORS,
104                          &fMaxFragmentUniformVectors);
105    } else {
106        GrAssert(kDesktop_GrGLBinding == binding);
107        GrGLint max;
108        GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, &max);
109        fMaxFragmentUniformVectors = max / 4;
110    }
111    GR_GL_GetIntegerv(gli, GR_GL_MAX_VERTEX_ATTRIBS, &fMaxVertexAttributes);
112
113    if (kDesktop_GrGLBinding == binding) {
114        fRGBA8RenderbufferSupport = true;
115    } else {
116        fRGBA8RenderbufferSupport = ctxInfo.hasExtension("GL_OES_rgb8_rgba8") ||
117                                    ctxInfo.hasExtension("GL_ARM_rgba8");
118    }
119
120    if (kDesktop_GrGLBinding == binding) {
121        fBGRAFormatSupport = version >= GR_GL_VER(1,2) ||
122                             ctxInfo.hasExtension("GL_EXT_bgra");
123    } else {
124        if (ctxInfo.hasExtension("GL_APPLE_texture_format_BGRA8888")) {
125            fBGRAFormatSupport = true;
126        } else if (ctxInfo.hasExtension("GL_EXT_texture_format_BGRA8888")) {
127            fBGRAFormatSupport = true;
128            fBGRAIsInternalFormat = true;
129        }
130        GrAssert(fBGRAFormatSupport ||
131                 kSkia8888_GrPixelConfig != kBGRA_8888_GrPixelConfig);
132    }
133
134    if (kDesktop_GrGLBinding == binding) {
135        fTextureSwizzleSupport = version >= GR_GL_VER(3,3) ||
136                                 ctxInfo.hasExtension("GL_ARB_texture_swizzle");
137    } else {
138        fTextureSwizzleSupport = false;
139    }
140
141    if (kDesktop_GrGLBinding == binding) {
142        fUnpackRowLengthSupport = true;
143        fUnpackFlipYSupport = false;
144        fPackRowLengthSupport = true;
145        fPackFlipYSupport = false;
146    } else {
147        fUnpackRowLengthSupport =ctxInfo.hasExtension("GL_EXT_unpack_subimage");
148        fUnpackFlipYSupport = ctxInfo.hasExtension("GL_CHROMIUM_flipy");
149        // no extension for pack row length
150        fPackRowLengthSupport = false;
151        fPackFlipYSupport =
152            ctxInfo.hasExtension("GL_ANGLE_pack_reverse_row_order");
153    }
154
155    fTextureUsageSupport = (kES2_GrGLBinding == binding) &&
156                            ctxInfo.hasExtension("GL_ANGLE_texture_usage");
157
158    // Tex storage is in desktop 4.2 and can be an extension to desktop or ES.
159    fTexStorageSupport = (kDesktop_GrGLBinding == binding &&
160                          version >= GR_GL_VER(4,2)) ||
161                         ctxInfo.hasExtension("GL_ARB_texture_storage") ||
162                         ctxInfo.hasExtension("GL_EXT_texture_storage");
163
164    // ARB_texture_rg is part of OpenGL 3.0
165    if (kDesktop_GrGLBinding == binding) {
166        fTextureRedSupport = version >= GR_GL_VER(3,0) ||
167                             ctxInfo.hasExtension("GL_ARB_texture_rg");
168    } else {
169        fTextureRedSupport = ctxInfo.hasExtension("GL_EXT_texture_rg");
170    }
171
172    fImagingSupport = kDesktop_GrGLBinding == binding &&
173                      ctxInfo.hasExtension("GL_ARB_imaging");
174
175    // ES 2 only guarantees RGBA/uchar + one other format/type combo for
176    // ReadPixels. The other format has to checked at run-time since it
177    // can change based on which render target is bound
178    fTwoFormatLimit = kES2_GrGLBinding == binding;
179
180    // Known issue on at least some Intel platforms:
181    // http://code.google.com/p/skia/issues/detail?id=946
182    if (kIntel_GrGLVendor != ctxInfo.vendor()) {
183        fFragCoordsConventionSupport = ctxInfo.glslGeneration() >= k150_GrGLSLGeneration ||
184                                       ctxInfo.hasExtension("GL_ARB_fragment_coord_conventions");
185    }
186
187    // SGX and Mali GPUs that are based on a tiled-deferred architecture that have trouble with
188    // frequently changing VBOs. We've measured a performance increase using non-VBO vertex
189    // data for dynamic content on these GPUs. Perhaps we should read the renderer string and
190    // limit this decision to specific GPU families rather than basing it on the vendor alone.
191    if (!GR_GL_MUST_USE_VBO &&
192        (kARM_GrGLVendor == ctxInfo.vendor() || kImagination_GrGLVendor == ctxInfo.vendor())) {
193        fUseNonVBOVertexAndIndexDynamicData = true;
194    }
195
196    if (kDesktop_GrGLBinding == binding && version >= GR_GL_VER(3, 2)) {
197        GrGLint profileMask;
198        GR_GL_GetIntegerv(gli, GR_GL_CONTEXT_PROFILE_MASK, &profileMask);
199        fIsCoreProfile = SkToBool(profileMask & GR_GL_CONTEXT_CORE_PROFILE_BIT);
200    }
201
202    fDiscardFBSupport = ctxInfo.hasExtension("GL_EXT_discard_framebuffer");
203
204    if (kDesktop_GrGLBinding == binding) {
205        fVertexArrayObjectSupport = version >= GR_GL_VER(3, 0) ||
206                                    ctxInfo.hasExtension("GL_ARB_vertex_array_object");
207    } else {
208        fVertexArrayObjectSupport = ctxInfo.hasExtension("GL_OES_vertex_array_object");
209    }
210
211    if (kES2_GrGLBinding == binding) {
212        if (ctxInfo.hasExtension("GL_EXT_shader_framebuffer_fetch")) {
213            fFBFetchType = kEXT_FBFetchType;
214        } else if (ctxInfo.hasExtension("GL_NV_shader_framebuffer_fetch")) {
215            fFBFetchType = kNV_FBFetchType;
216        }
217    }
218
219    this->initFSAASupport(ctxInfo, gli);
220    this->initStencilFormats(ctxInfo);
221
222    /**************************************************************************
223     * GrDrawTargetCaps fields
224     **************************************************************************/
225    GrGLint maxTextureUnits;
226    // check FS and fixed-function texture unit limits
227    // we only use textures in the fragment stage currently.
228    // checks are > to make sure we have a spare unit.
229    GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_IMAGE_UNITS, &maxTextureUnits);
230
231    GrGLint numFormats;
232    GR_GL_GetIntegerv(gli, GR_GL_NUM_COMPRESSED_TEXTURE_FORMATS, &numFormats);
233    if (numFormats) {
234        SkAutoSTMalloc<10, GrGLint> formats(numFormats);
235        GR_GL_GetIntegerv(gli, GR_GL_COMPRESSED_TEXTURE_FORMATS, formats);
236        for (int i = 0; i < numFormats; ++i) {
237            if (formats[i] == GR_GL_PALETTE8_RGBA8) {
238                f8BitPaletteSupport = true;
239                break;
240            }
241        }
242    }
243
244    if (kDesktop_GrGLBinding == binding) {
245        // we could also look for GL_ATI_separate_stencil extension or
246        // GL_EXT_stencil_two_side but they use different function signatures
247        // than GL2.0+ (and than each other).
248        fTwoSidedStencilSupport = (ctxInfo.version() >= GR_GL_VER(2,0));
249        // supported on GL 1.4 and higher or by extension
250        fStencilWrapOpsSupport = (ctxInfo.version() >= GR_GL_VER(1,4)) ||
251                                  ctxInfo.hasExtension("GL_EXT_stencil_wrap");
252    } else {
253        // ES 2 has two sided stencil and stencil wrap
254        fTwoSidedStencilSupport = true;
255        fStencilWrapOpsSupport = true;
256    }
257
258    if (kDesktop_GrGLBinding == binding) {
259        fBufferLockSupport = true; // we require VBO support and the desktop VBO extension includes
260                                   // glMapBuffer.
261    } else {
262        fBufferLockSupport = ctxInfo.hasExtension("GL_OES_mapbuffer");
263    }
264
265    if (kDesktop_GrGLBinding == binding) {
266        if (ctxInfo.version() >= GR_GL_VER(2,0) ||
267            ctxInfo.hasExtension("GL_ARB_texture_non_power_of_two")) {
268            fNPOTTextureTileSupport = true;
269        } else {
270            fNPOTTextureTileSupport = false;
271        }
272    } else {
273        // Unextended ES2 supports NPOT textures with clamp_to_edge and non-mip filters only
274        fNPOTTextureTileSupport = ctxInfo.hasExtension("GL_OES_texture_npot");
275    }
276
277    fHWAALineSupport = (kDesktop_GrGLBinding == binding);
278
279    GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_SIZE, &fMaxTextureSize);
280    GR_GL_GetIntegerv(gli, GR_GL_MAX_RENDERBUFFER_SIZE, &fMaxRenderTargetSize);
281    // Our render targets are always created with textures as the color
282    // attachment, hence this min:
283    fMaxRenderTargetSize = GrMin(fMaxTextureSize, fMaxRenderTargetSize);
284
285    fPathStencilingSupport = GR_GL_USE_NV_PATH_RENDERING &&
286                             ctxInfo.hasExtension("GL_NV_path_rendering");
287
288    fDstReadInShaderSupport = kNone_FBFetchType != fFBFetchType;
289
290    // Enable supported shader-related caps
291    if (kDesktop_GrGLBinding == binding) {
292        fDualSourceBlendingSupport = ctxInfo.version() >= GR_GL_VER(3,3) ||
293                                     ctxInfo.hasExtension("GL_ARB_blend_func_extended");
294        fShaderDerivativeSupport = true;
295        // we don't support GL_ARB_geometry_shader4, just GL 3.2+ GS
296        fGeometryShaderSupport = ctxInfo.version() >= GR_GL_VER(3,2) &&
297                                 ctxInfo.glslGeneration() >= k150_GrGLSLGeneration;
298    } else {
299        fShaderDerivativeSupport = ctxInfo.hasExtension("GL_OES_standard_derivatives");
300    }
301
302    if (GrGLCaps::kES_IMG_MsToTexture_MSFBOType == fMSFBOType) {
303        GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES_IMG, &fMaxSampleCount);
304    } else if (GrGLCaps::kNone_MSFBOType != fMSFBOType) {
305        GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES, &fMaxSampleCount);
306    }
307}
308
309bool GrGLCaps::readPixelsSupported(const GrGLInterface* intf,
310                                   GrGLenum format,
311                                   GrGLenum type) const {
312    if (GR_GL_RGBA == format && GR_GL_UNSIGNED_BYTE == type) {
313        // ES 2 guarantees this format is supported
314        return true;
315    }
316
317    if (!fTwoFormatLimit) {
318        // not limited by ES 2's constraints
319        return true;
320    }
321
322    GrGLint otherFormat = GR_GL_RGBA;
323    GrGLint otherType = GR_GL_UNSIGNED_BYTE;
324
325    // The other supported format/type combo supported for ReadPixels
326    // can change based on which render target is bound
327    GR_GL_GetIntegerv(intf,
328                      GR_GL_IMPLEMENTATION_COLOR_READ_FORMAT,
329                      &otherFormat);
330
331    GR_GL_GetIntegerv(intf,
332                      GR_GL_IMPLEMENTATION_COLOR_READ_TYPE,
333                      &otherType);
334
335    return (GrGLenum)otherFormat == format && (GrGLenum)otherType == type;
336}
337
338namespace {
339bool cov_mode_less(const GrGLCaps::MSAACoverageMode& left,
340                   const GrGLCaps::MSAACoverageMode& right) {
341    if (left.fCoverageSampleCnt < right.fCoverageSampleCnt) {
342        return true;
343    } else if (right.fCoverageSampleCnt < left.fCoverageSampleCnt) {
344        return false;
345    } else if (left.fColorSampleCnt < right.fColorSampleCnt) {
346        return true;
347    }
348    return false;
349}
350}
351
352void GrGLCaps::initFSAASupport(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
353
354    fMSFBOType = kNone_MSFBOType;
355    if (kDesktop_GrGLBinding != ctxInfo.binding()) {
356       if (ctxInfo.hasExtension("GL_CHROMIUM_framebuffer_multisample")) {
357           // chrome's extension is equivalent to the EXT msaa
358           // and fbo_blit extensions.
359           fMSFBOType = kDesktop_EXT_MSFBOType;
360       } else if (ctxInfo.hasExtension("GL_APPLE_framebuffer_multisample")) {
361           fMSFBOType = kES_Apple_MSFBOType;
362       } else if (ctxInfo.hasExtension("GL_EXT_multisampled_render_to_texture")) {
363           fMSFBOType = kES_EXT_MsToTexture_MSFBOType;
364       } else if (ctxInfo.hasExtension("GL_IMG_multisampled_render_to_texture")) {
365           fMSFBOType = kES_IMG_MsToTexture_MSFBOType;
366       }
367    } else {
368        if ((ctxInfo.version() >= GR_GL_VER(3,0)) ||
369            ctxInfo.hasExtension("GL_ARB_framebuffer_object")) {
370            fMSFBOType = GrGLCaps::kDesktop_ARB_MSFBOType;
371        } else if (ctxInfo.hasExtension("GL_EXT_framebuffer_multisample") &&
372                   ctxInfo.hasExtension("GL_EXT_framebuffer_blit")) {
373            fMSFBOType = GrGLCaps::kDesktop_EXT_MSFBOType;
374        }
375        // TODO: We could populate fMSAACoverageModes using GetInternalformativ
376        // on GL 4.2+. It's format-specific, though. See also
377        // http://code.google.com/p/skia/issues/detail?id=470 about using actual
378        // rather than requested sample counts in cache key.
379        if (ctxInfo.hasExtension("GL_NV_framebuffer_multisample_coverage")) {
380            fCoverageAAType = kNVDesktop_CoverageAAType;
381            GrGLint count;
382            GR_GL_GetIntegerv(gli,
383                              GR_GL_MAX_MULTISAMPLE_COVERAGE_MODES,
384                              &count);
385            fMSAACoverageModes.setCount(count);
386            GR_GL_GetIntegerv(gli,
387                              GR_GL_MULTISAMPLE_COVERAGE_MODES,
388                              (int*)&fMSAACoverageModes[0]);
389            // The NV driver seems to return the modes already sorted but the
390            // spec doesn't require this. So we sort.
391            typedef SkTLessFunctionToFunctorAdaptor<MSAACoverageMode, cov_mode_less> SortFunctor;
392            SortFunctor sortFunctor;
393            SkTQSort<MSAACoverageMode, SortFunctor>(fMSAACoverageModes.begin(),
394                                                    fMSAACoverageModes.end() - 1,
395                                                    sortFunctor);
396        }
397    }
398}
399
400const GrGLCaps::MSAACoverageMode& GrGLCaps::getMSAACoverageMode(int desiredSampleCount) const {
401    static const MSAACoverageMode kNoneMode = {0, 0};
402    if (0 == fMSAACoverageModes.count()) {
403        return kNoneMode;
404    } else {
405        GrAssert(kNone_CoverageAAType != fCoverageAAType);
406        int max = (fMSAACoverageModes.end() - 1)->fCoverageSampleCnt;
407        desiredSampleCount = GrMin(desiredSampleCount, max);
408        MSAACoverageMode desiredMode = {desiredSampleCount, 0};
409        int idx = SkTSearch<const MSAACoverageMode, cov_mode_less>(&fMSAACoverageModes[0],
410                                                                   fMSAACoverageModes.count(),
411                                                                   desiredMode,
412                                                                   sizeof(MSAACoverageMode));
413        if (idx < 0) {
414            idx = ~idx;
415        }
416        GrAssert(idx >= 0 && idx < fMSAACoverageModes.count());
417        return fMSAACoverageModes[idx];
418    }
419}
420
421namespace {
422const GrGLuint kUnknownBitCount = GrGLStencilBuffer::kUnknownBitCount;
423}
424
425void GrGLCaps::initStencilFormats(const GrGLContextInfo& ctxInfo) {
426
427    // Build up list of legal stencil formats (though perhaps not supported on
428    // the particular gpu/driver) from most preferred to least.
429
430    // these consts are in order of most preferred to least preferred
431    // we don't bother with GL_STENCIL_INDEX1 or GL_DEPTH32F_STENCIL8
432
433    static const StencilFormat
434                  // internal Format      stencil bits      total bits        packed?
435        gS8    = {GR_GL_STENCIL_INDEX8,   8,                8,                false},
436        gS16   = {GR_GL_STENCIL_INDEX16,  16,               16,               false},
437        gD24S8 = {GR_GL_DEPTH24_STENCIL8, 8,                32,               true },
438        gS4    = {GR_GL_STENCIL_INDEX4,   4,                4,                false},
439    //  gS     = {GR_GL_STENCIL_INDEX,    kUnknownBitCount, kUnknownBitCount, false},
440        gDS    = {GR_GL_DEPTH_STENCIL,    kUnknownBitCount, kUnknownBitCount, true };
441
442    if (kDesktop_GrGLBinding == ctxInfo.binding()) {
443        bool supportsPackedDS =
444            ctxInfo.version() >= GR_GL_VER(3,0) ||
445            ctxInfo.hasExtension("GL_EXT_packed_depth_stencil") ||
446            ctxInfo.hasExtension("GL_ARB_framebuffer_object");
447
448        // S1 thru S16 formats are in GL 3.0+, EXT_FBO, and ARB_FBO since we
449        // require FBO support we can expect these are legal formats and don't
450        // check. These also all support the unsized GL_STENCIL_INDEX.
451        fStencilFormats.push_back() = gS8;
452        fStencilFormats.push_back() = gS16;
453        if (supportsPackedDS) {
454            fStencilFormats.push_back() = gD24S8;
455        }
456        fStencilFormats.push_back() = gS4;
457        if (supportsPackedDS) {
458            fStencilFormats.push_back() = gDS;
459        }
460    } else {
461        // ES2 has STENCIL_INDEX8 without extensions but requires extensions
462        // for other formats.
463        // ES doesn't support using the unsized format.
464
465        fStencilFormats.push_back() = gS8;
466        //fStencilFormats.push_back() = gS16;
467        if (ctxInfo.hasExtension("GL_OES_packed_depth_stencil")) {
468            fStencilFormats.push_back() = gD24S8;
469        }
470        if (ctxInfo.hasExtension("GL_OES_stencil4")) {
471            fStencilFormats.push_back() = gS4;
472        }
473    }
474    GrAssert(0 == fStencilVerifiedColorConfigs.count());
475    fStencilVerifiedColorConfigs.push_back_n(fStencilFormats.count());
476}
477
478void GrGLCaps::markColorConfigAndStencilFormatAsVerified(
479                                    GrPixelConfig config,
480                                    const GrGLStencilBuffer::Format& format) {
481#if !GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT
482    return;
483#endif
484    GrAssert((unsigned)config < (unsigned)kGrPixelConfigCnt);
485    GrAssert(fStencilFormats.count() == fStencilVerifiedColorConfigs.count());
486    int count = fStencilFormats.count();
487    // we expect a really small number of possible formats so linear search
488    // should be OK
489    GrAssert(count < 16);
490    for (int i = 0; i < count; ++i) {
491        if (format.fInternalFormat ==
492            fStencilFormats[i].fInternalFormat) {
493            fStencilVerifiedColorConfigs[i].markVerified(config);
494            return;
495        }
496    }
497    GrCrash("Why are we seeing a stencil format that "
498            "GrGLCaps doesn't know about.");
499}
500
501bool GrGLCaps::isColorConfigAndStencilFormatVerified(
502                                GrPixelConfig config,
503                                const GrGLStencilBuffer::Format& format) const {
504#if !GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT
505    return false;
506#endif
507    GrAssert((unsigned)config < (unsigned)kGrPixelConfigCnt);
508    int count = fStencilFormats.count();
509    // we expect a really small number of possible formats so linear search
510    // should be OK
511    GrAssert(count < 16);
512    for (int i = 0; i < count; ++i) {
513        if (format.fInternalFormat ==
514            fStencilFormats[i].fInternalFormat) {
515            return fStencilVerifiedColorConfigs[i].isVerified(config);
516        }
517    }
518    GrCrash("Why are we seeing a stencil format that "
519            "GLCaps doesn't know about.");
520    return false;
521}
522
523void GrGLCaps::print() const {
524
525    INHERITED::print();
526
527    GrPrintf("--- GL-Specific ---\n");
528    for (int i = 0; i < fStencilFormats.count(); ++i) {
529        GrPrintf("Stencil Format %d, stencil bits: %02d, total bits: %02d\n",
530                 i,
531                 fStencilFormats[i].fStencilBits,
532                 fStencilFormats[i].fTotalBits);
533    }
534
535    static const char* kMSFBOExtStr[] = {
536        "None",
537        "ARB",
538        "EXT",
539        "Apple",
540        "IMG MS To Texture",
541        "EXT MS To Texture",
542    };
543    GR_STATIC_ASSERT(0 == kNone_MSFBOType);
544    GR_STATIC_ASSERT(1 == kDesktop_ARB_MSFBOType);
545    GR_STATIC_ASSERT(2 == kDesktop_EXT_MSFBOType);
546    GR_STATIC_ASSERT(3 == kES_Apple_MSFBOType);
547    GR_STATIC_ASSERT(4 == kES_IMG_MsToTexture_MSFBOType);
548    GR_STATIC_ASSERT(5 == kES_EXT_MsToTexture_MSFBOType);
549    GR_STATIC_ASSERT(GR_ARRAY_COUNT(kMSFBOExtStr) == kLast_MSFBOType + 1);
550
551    static const char* kFBFetchTypeStr[] = {
552        "None",
553        "EXT",
554        "NV",
555    };
556    GR_STATIC_ASSERT(0 == kNone_FBFetchType);
557    GR_STATIC_ASSERT(1 == kEXT_FBFetchType);
558    GR_STATIC_ASSERT(2 == kNV_FBFetchType);
559    GR_STATIC_ASSERT(GR_ARRAY_COUNT(kFBFetchTypeStr) == kLast_FBFetchType + 1);
560
561
562    GrPrintf("MSAA Type: %s\n", kMSFBOExtStr[fMSFBOType]);
563    GrPrintf("FB Fetch Type: %s\n", kFBFetchTypeStr[fFBFetchType]);
564    GrPrintf("Max FS Uniform Vectors: %d\n", fMaxFragmentUniformVectors);
565    GrPrintf("Max Vertex Attributes: %d\n", fMaxVertexAttributes);
566    GrPrintf("Support RGBA8 Render Buffer: %s\n", (fRGBA8RenderbufferSupport ? "YES": "NO"));
567    GrPrintf("BGRA support: %s\n", (fBGRAFormatSupport ? "YES": "NO"));
568    GrPrintf("BGRA is an internal format: %s\n", (fBGRAIsInternalFormat ? "YES": "NO"));
569    GrPrintf("Support texture swizzle: %s\n", (fTextureSwizzleSupport ? "YES": "NO"));
570    GrPrintf("Unpack Row length support: %s\n", (fUnpackRowLengthSupport ? "YES": "NO"));
571    GrPrintf("Unpack Flip Y support: %s\n", (fUnpackFlipYSupport ? "YES": "NO"));
572    GrPrintf("Pack Row length support: %s\n", (fPackRowLengthSupport ? "YES": "NO"));
573    GrPrintf("Pack Flip Y support: %s\n", (fPackFlipYSupport ? "YES": "NO"));
574
575    GrPrintf("Texture Usage support: %s\n", (fTextureUsageSupport ? "YES": "NO"));
576    GrPrintf("Texture Storage support: %s\n", (fTexStorageSupport ? "YES": "NO"));
577    GrPrintf("GL_R support: %s\n", (fTextureRedSupport ? "YES": "NO"));
578    GrPrintf("GL_ARB_imaging support: %s\n", (fImagingSupport ? "YES": "NO"));
579    GrPrintf("Two Format Limit: %s\n", (fTwoFormatLimit ? "YES": "NO"));
580    GrPrintf("Fragment coord conventions support: %s\n",
581             (fFragCoordsConventionSupport ? "YES": "NO"));
582    GrPrintf("Vertex array object support: %s\n", (fVertexArrayObjectSupport ? "YES": "NO"));
583    GrPrintf("Use non-VBO for dynamic data: %s\n",
584             (fUseNonVBOVertexAndIndexDynamicData ? "YES" : "NO"));
585    GrPrintf("Core Profile: %s\n", (fIsCoreProfile ? "YES" : "NO"));
586    GrPrintf("Discard FrameBuffer support: %s\n", (fDiscardFBSupport ? "YES" : "NO"));
587}
588