src/third_party/skia/src/gpu/gl/GrGLCaps.cpp

   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
  14 GrGLCaps::GrGLCaps() {
  15     this->reset();
  16 }
  17
  18 void GrGLCaps::reset() {
  19     INHERITED::reset();
  20
  21     fVerifiedColorConfigs.reset();
  22     fStencilFormats.reset();
  23     fStencilVerifiedColorConfigs.reset();
  24     fMSFBOType = kNone_MSFBOType;
  25     fFBFetchType = kNone_FBFetchType;
  26     fInvalidateFBType = kNone_InvalidateFBType;
  27     fMapBufferType = kNone_MapBufferType;
  28     fMaxFragmentUniformVectors = 0;
  29     fMaxVertexAttributes = 0;
  30     fMaxFragmentTextureUnits = 0;
  31     fMaxFixedFunctionTextureCoords = 0;
  32     fRGBA8RenderbufferSupport = false;
  33     fBGRAFormatSupport = false;
  34     fBGRAIsInternalFormat = false;
  35     fTextureSwizzleSupport = false;
  36     fUnpackRowLengthSupport = false;
  37     fUnpackFlipYSupport = false;
  38     fPackRowLengthSupport = false;
  39     fPackFlipYSupport = false;
  40     fTextureUsageSupport = false;
  41     fTexStorageSupport = false;
  42     fTextureRedSupport = false;
  43     fImagingSupport = false;
  44     fTwoFormatLimit = false;
  45     fFragCoordsConventionSupport = false;
  46     fVertexArrayObjectSupport = false;
  47     fUseNonVBOVertexAndIndexDynamicData = false;
  48     fIsCoreProfile = false;
  49     fFullClearIsFree = false;
  50     fDropsTileOnZeroDivide = false;
  51 }
  52
  53 GrGLCaps::GrGLCaps(const GrGLCaps& caps) : GrDrawTargetCaps() {
  54     *this = caps;
  55 }
  56
  57 GrGLCaps& GrGLCaps::operator= (const GrGLCaps& caps) {
  58     INHERITED::operator=(caps);
  59     fVerifiedColorConfigs = caps.fVerifiedColorConfigs;
  60     fStencilFormats = caps.fStencilFormats;
  61     fStencilVerifiedColorConfigs = caps.fStencilVerifiedColorConfigs;
  62     fMaxFragmentUniformVectors = caps.fMaxFragmentUniformVectors;
  63     fMaxVertexAttributes = caps.fMaxVertexAttributes;
  64     fMaxFragmentTextureUnits = caps.fMaxFragmentTextureUnits;
  65     fMaxFixedFunctionTextureCoords = caps.fMaxFixedFunctionTextureCoords;
  66     fMSFBOType = caps.fMSFBOType;
  67     fFBFetchType = caps.fFBFetchType;
  68     fInvalidateFBType = caps.fInvalidateFBType;
  69     fMapBufferType = caps.fMapBufferType;
  70     fRGBA8RenderbufferSupport = caps.fRGBA8RenderbufferSupport;
  71     fBGRAFormatSupport = caps.fBGRAFormatSupport;
  72     fBGRAIsInternalFormat = caps.fBGRAIsInternalFormat;
  73     fTextureSwizzleSupport = caps.fTextureSwizzleSupport;
  74     fUnpackRowLengthSupport = caps.fUnpackRowLengthSupport;
  75     fUnpackFlipYSupport = caps.fUnpackFlipYSupport;
  76     fPackRowLengthSupport = caps.fPackRowLengthSupport;
  77     fPackFlipYSupport = caps.fPackFlipYSupport;
  78     fTextureUsageSupport = caps.fTextureUsageSupport;
  79     fTexStorageSupport = caps.fTexStorageSupport;
  80     fTextureRedSupport = caps.fTextureRedSupport;
  81     fImagingSupport = caps.fImagingSupport;
  82     fTwoFormatLimit = caps.fTwoFormatLimit;
  83     fFragCoordsConventionSupport = caps.fFragCoordsConventionSupport;
  84     fVertexArrayObjectSupport = caps.fVertexArrayObjectSupport;
  85     fUseNonVBOVertexAndIndexDynamicData = caps.fUseNonVBOVertexAndIndexDynamicData;
  86     fIsCoreProfile = caps.fIsCoreProfile;
  87     fFullClearIsFree = caps.fFullClearIsFree;
  88     fDropsTileOnZeroDivide = caps.fDropsTileOnZeroDivide;
  89
  90     return *this;
  91 }
  92
  93 bool GrGLCaps::init(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
  94
  95     this->reset();
  96     if (!ctxInfo.isInitialized()) {
  97         return false;
  98     }
  99
 100     GrGLStandard standard = ctxInfo.standard();
 101     GrGLVersion version = ctxInfo.version();
 102
 103     /**************************************************************************
 104      * Caps specific to GrGLCaps
 105      **************************************************************************/
 106
 107     if (kGLES_GrGLStandard == standard) {
 108         GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_UNIFORM_VECTORS,
 109                           &fMaxFragmentUniformVectors);
 110     } else {
 111         SkASSERT(kGL_GrGLStandard == standard);
 112         GrGLint max;
 113         GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, &max);
 114         fMaxFragmentUniformVectors = max / 4;
 115         if (version >= GR_GL_VER(3, 2)) {
 116             GrGLint profileMask;
 117             GR_GL_GetIntegerv(gli, GR_GL_CONTEXT_PROFILE_MASK, &profileMask);
 118             fIsCoreProfile = SkToBool(profileMask & GR_GL_CONTEXT_CORE_PROFILE_BIT);
 119         }
 120         if (!fIsCoreProfile) {
 121             GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_COORDS, &fMaxFixedFunctionTextureCoords);
 122             // Sanity check
 123             SkASSERT(fMaxFixedFunctionTextureCoords > 0 && fMaxFixedFunctionTextureCoords < 128);
 124         }
 125     }
 126     GR_GL_GetIntegerv(gli, GR_GL_MAX_VERTEX_ATTRIBS, &fMaxVertexAttributes);
 127     GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_IMAGE_UNITS, &fMaxFragmentTextureUnits);
 128
 129     if (kGL_GrGLStandard == standard) {
 130         fRGBA8RenderbufferSupport = true;
 131     } else {
 132         fRGBA8RenderbufferSupport = version >= GR_GL_VER(3,0) ||
 133                                     ctxInfo.hasExtension("GL_OES_rgb8_rgba8") ||
 134                                     ctxInfo.hasExtension("GL_ARM_rgba8");
 135     }
 136
 137     if (kGL_GrGLStandard == standard) {
 138         fBGRAFormatSupport = version >= GR_GL_VER(1,2) ||
 139                              ctxInfo.hasExtension("GL_EXT_bgra");
 140     } else {
 141         if (ctxInfo.hasExtension("GL_APPLE_texture_format_BGRA8888")) {
 142             fBGRAFormatSupport = true;
 143         } else if (ctxInfo.hasExtension("GL_EXT_texture_format_BGRA8888")) {
 144             fBGRAFormatSupport = true;
 145             fBGRAIsInternalFormat = true;
 146         }
 147         SkASSERT(fBGRAFormatSupport ||
 148                  kSkia8888_GrPixelConfig != kBGRA_8888_GrPixelConfig);
 149     }
 150
 151     if (kGL_GrGLStandard == standard) {
 152         fTextureSwizzleSupport = version >= GR_GL_VER(3,3) ||
 153                                  ctxInfo.hasExtension("GL_ARB_texture_swizzle");
 154     } else {
 155         fTextureSwizzleSupport = version >= GR_GL_VER(3,0);
 156     }
 157
 158     if (kGL_GrGLStandard == standard) {
 159         fUnpackRowLengthSupport = true;
 160         fUnpackFlipYSupport = false;
 161         fPackRowLengthSupport = true;
 162         fPackFlipYSupport = false;
 163     } else {
 164         fUnpackRowLengthSupport = version >= GR_GL_VER(3,0) ||
 165                                   ctxInfo.hasExtension("GL_EXT_unpack_subimage");
 166         fUnpackFlipYSupport = ctxInfo.hasExtension("GL_CHROMIUM_flipy");
 167         fPackRowLengthSupport = version >= GR_GL_VER(3,0) ||
 168                                 ctxInfo.hasExtension("GL_NV_pack_subimage");
 169         fPackFlipYSupport =
 170             ctxInfo.hasExtension("GL_ANGLE_pack_reverse_row_order");
 171     }
 172
 173     fTextureUsageSupport = (kGLES_GrGLStandard == standard) &&
 174                             ctxInfo.hasExtension("GL_ANGLE_texture_usage");
 175
 176     if (kGL_GrGLStandard == standard) {
 177         // The EXT version can apply to either GL or GLES.
 178         fTexStorageSupport = version >= GR_GL_VER(4,2) ||
 179                              ctxInfo.hasExtension("GL_ARB_texture_storage") ||
 180                              ctxInfo.hasExtension("GL_EXT_texture_storage");
 181     } else {
 182         // Qualcomm Adreno drivers appear to have issues with texture storage.
 183         fTexStorageSupport = (version >= GR_GL_VER(3,0) &&
 184                               kQualcomm_GrGLVendor != ctxInfo.vendor()) ||
 185                              ctxInfo.hasExtension("GL_EXT_texture_storage");
 186     }
 187
 188     // ARB_texture_rg is part of OpenGL 3.0, but mesa doesn't support it if
 189     // it doesn't have ARB_texture_rg extension.
 190     if (kGL_GrGLStandard == standard) {
 191         if (ctxInfo.isMesa()) {
 192             fTextureRedSupport = ctxInfo.hasExtension("GL_ARB_texture_rg");
 193         } else {
 194             fTextureRedSupport = version >= GR_GL_VER(3,0) ||
 195                                  ctxInfo.hasExtension("GL_ARB_texture_rg");
 196         }
 197     } else {
 198         fTextureRedSupport =  version >= GR_GL_VER(3,0) ||
 199                               ctxInfo.hasExtension("GL_EXT_texture_rg");
 200     }
 201
 202     fImagingSupport = kGL_GrGLStandard == standard &&
 203                       ctxInfo.hasExtension("GL_ARB_imaging");
 204
 205     // ES 2 only guarantees RGBA/uchar + one other format/type combo for
 206     // ReadPixels. The other format has to checked at run-time since it
 207     // can change based on which render target is bound
 208     fTwoFormatLimit = kGLES_GrGLStandard == standard;
 209
 210     // Known issue on at least some Intel platforms:
 211     // http://code.google.com/p/skia/issues/detail?id=946
 212     if (kIntel_GrGLVendor != ctxInfo.vendor()) {
 213         fFragCoordsConventionSupport = ctxInfo.glslGeneration() >= k150_GrGLSLGeneration ||
 214                                        ctxInfo.hasExtension("GL_ARB_fragment_coord_conventions");
 215     }
 216
 217     // SGX and Mali GPUs that are based on a tiled-deferred architecture that have trouble with
 218     // frequently changing VBOs. We've measured a performance increase using non-VBO vertex
 219     // data for dynamic content on these GPUs. Perhaps we should read the renderer string and
 220     // limit this decision to specific GPU families rather than basing it on the vendor alone.
 221     if (!GR_GL_MUST_USE_VBO &&
 222         (kARM_GrGLVendor == ctxInfo.vendor() || kImagination_GrGLVendor == ctxInfo.vendor())) {
 223         fUseNonVBOVertexAndIndexDynamicData = true;
 224     }
 225
 226     if ((kGL_GrGLStandard == standard && version >= GR_GL_VER(4,3)) ||
 227         (kGLES_GrGLStandard == standard && version >= GR_GL_VER(3,0)) ||
 228         ctxInfo.hasExtension("GL_ARB_invalidate_subdata")) {
 229         fDiscardRenderTargetSupport = true;
 230         fInvalidateFBType = kInvalidate_InvalidateFBType;
 231     } else if (ctxInfo.hasExtension("GL_EXT_discard_framebuffer")) {
 232         fDiscardRenderTargetSupport = true;
 233         fInvalidateFBType = kDiscard_InvalidateFBType;
 234     }
 235
 236     if (kARM_GrGLVendor == ctxInfo.vendor() || kImagination_GrGLVendor == ctxInfo.vendor()) {
 237         fFullClearIsFree = true;
 238     }
 239
 240     if (kGL_GrGLStandard == standard) {
 241         fVertexArrayObjectSupport = version >= GR_GL_VER(3, 0) ||
 242                                     ctxInfo.hasExtension("GL_ARB_vertex_array_object");
 243     } else {
 244         fVertexArrayObjectSupport = version >= GR_GL_VER(3, 0) ||
 245                                     ctxInfo.hasExtension("GL_OES_vertex_array_object");
 246     }
 247
 248     if (kGLES_GrGLStandard == standard) {
 249         if (ctxInfo.hasExtension("GL_EXT_shader_framebuffer_fetch")) {
 250             fFBFetchType = kEXT_FBFetchType;
 251         } else if (ctxInfo.hasExtension("GL_NV_shader_framebuffer_fetch")) {
 252             fFBFetchType = kNV_FBFetchType;
 253         }
 254     }
 255
 256     // Adreno GPUs have a tendency to drop tiles when there is a divide-by-zero in a shader
 257     fDropsTileOnZeroDivide = kQualcomm_GrGLVendor == ctxInfo.vendor();
 258
 259     this->initFSAASupport(ctxInfo, gli);
 260     this->initStencilFormats(ctxInfo);
 261
 262     /**************************************************************************
 263      * GrDrawTargetCaps fields
 264      **************************************************************************/
 265     GrGLint numFormats;
 266     GR_GL_GetIntegerv(gli, GR_GL_NUM_COMPRESSED_TEXTURE_FORMATS, &numFormats);
 267     if (numFormats) {
 268         SkAutoSTMalloc<10, GrGLint> formats(numFormats);
 269         GR_GL_GetIntegerv(gli, GR_GL_COMPRESSED_TEXTURE_FORMATS, formats);
 270         for (int i = 0; i < numFormats; ++i) {
 271             if (formats[i] == GR_GL_PALETTE8_RGBA8) {
 272                 f8BitPaletteSupport = true;
 273                 break;
 274             }
 275         }
 276     }
 277
 278     if (kGL_GrGLStandard == standard) {
 279         // we could also look for GL_ATI_separate_stencil extension or
 280         // GL_EXT_stencil_two_side but they use different function signatures
 281         // than GL2.0+ (and than each other).
 282         fTwoSidedStencilSupport = (ctxInfo.version() >= GR_GL_VER(2,0));
 283         // supported on GL 1.4 and higher or by extension
 284         fStencilWrapOpsSupport = (ctxInfo.version() >= GR_GL_VER(1,4)) ||
 285                                   ctxInfo.hasExtension("GL_EXT_stencil_wrap");
 286     } else {
 287         // ES 2 has two sided stencil and stencil wrap
 288         fTwoSidedStencilSupport = true;
 289         fStencilWrapOpsSupport = true;
 290     }
 291
 292     if (kGL_GrGLStandard == standard) {
 293         fMapBufferFlags = kCanMap_MapFlag; // we require VBO support and the desktop VBO
 294                                             // extension includes glMapBuffer.
 295         if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_ARB_map_buffer_range")) {
 296             fMapBufferFlags |= kSubset_MapFlag;
 297             fMapBufferType = kMapBufferRange_MapBufferType;
 298         } else {
 299             fMapBufferType = kMapBuffer_MapBufferType;
 300         }
 301     } else {
 302         // Unextended GLES2 doesn't have any buffer mapping.
 303         fMapBufferFlags = kNone_MapBufferType;
 304         if (ctxInfo.hasExtension("GL_CHROMIUM_map_sub")) {
 305             fMapBufferFlags = kCanMap_MapFlag | kSubset_MapFlag;
 306             fMapBufferType = kChromium_MapBufferType;
 307         } else if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_EXT_map_buffer_range")) {
 308             fMapBufferFlags = kCanMap_MapFlag | kSubset_MapFlag;
 309             fMapBufferType = kMapBufferRange_MapBufferType;
 310         } else if (ctxInfo.hasExtension("GL_OES_mapbuffer")) {
 311             fMapBufferFlags = kCanMap_MapFlag;
 312             fMapBufferType = kMapBuffer_MapBufferType;
 313         }
 314     }
 315
 316     if (kGL_GrGLStandard == standard) {
 317         SkASSERT(ctxInfo.version() >= GR_GL_VER(2,0) ||
 318                  ctxInfo.hasExtension("GL_ARB_texture_non_power_of_two"));
 319         fNPOTTextureTileSupport = true;
 320         fMipMapSupport = true;
 321     } else {
 322         // Unextended ES2 supports NPOT textures with clamp_to_edge and non-mip filters only
 323         // ES3 has no limitations.
 324         fNPOTTextureTileSupport = ctxInfo.version() >= GR_GL_VER(3,0) ||
 325                                   ctxInfo.hasExtension("GL_OES_texture_npot");
 326         // ES2 supports MIP mapping for POT textures but our caps don't allow for limited MIP
 327         // support. The OES extension or ES 3.0 allow for MIPS on NPOT textures. So, apparently,
 328         // does the undocumented GL_IMG_texture_npot extension. This extension does not seem to
 329         // to alllow arbitrary wrap modes, however.
 330         fMipMapSupport = fNPOTTextureTileSupport || ctxInfo.hasExtension("GL_IMG_texture_npot");
 331     }
 332
 333     fHWAALineSupport = (kGL_GrGLStandard == standard);
 334
 335     GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_SIZE, &fMaxTextureSize);
 336     GR_GL_GetIntegerv(gli, GR_GL_MAX_RENDERBUFFER_SIZE, &fMaxRenderTargetSize);
 337     // Our render targets are always created with textures as the color
 338     // attachment, hence this min:
 339     fMaxRenderTargetSize = SkTMin(fMaxTextureSize, fMaxRenderTargetSize);
 340
 341     fPathRenderingSupport = ctxInfo.hasExtension("GL_NV_path_rendering") &&
 342         ctxInfo.hasExtension("GL_EXT_direct_state_access");
 343
 344     fGpuTracingSupport = ctxInfo.hasExtension("GL_EXT_debug_marker");
 345
 346     fDstReadInShaderSupport = kNone_FBFetchType != fFBFetchType;
 347
 348     // Disable scratch texture reuse on Mali and Adreno devices
 349     fReuseScratchTextures = kARM_GrGLVendor != ctxInfo.vendor() &&
 350                             kQualcomm_GrGLVendor != ctxInfo.vendor();
 351
 352     // Enable supported shader-related caps
 353     if (kGL_GrGLStandard == standard) {
 354         fDualSourceBlendingSupport = ctxInfo.version() >= GR_GL_VER(3,3) ||
 355                                      ctxInfo.hasExtension("GL_ARB_blend_func_extended");
 356         fShaderDerivativeSupport = true;
 357         // we don't support GL_ARB_geometry_shader4, just GL 3.2+ GS
 358         fGeometryShaderSupport = ctxInfo.version() >= GR_GL_VER(3,2) &&
 359                                  ctxInfo.glslGeneration() >= k150_GrGLSLGeneration;
 360     } else {
 361         fShaderDerivativeSupport = ctxInfo.hasExtension("GL_OES_standard_derivatives");
 362     }
 363
 364     if (GrGLCaps::kES_IMG_MsToTexture_MSFBOType == fMSFBOType) {
 365         GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES_IMG, &fMaxSampleCount);
 366     } else if (GrGLCaps::kNone_MSFBOType != fMSFBOType) {
 367         GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES, &fMaxSampleCount);
 368     }
 369
 370     this->initConfigRenderableTable(ctxInfo);
 371
 372     return true;
 373 }
 374
 375 void GrGLCaps::initConfigRenderableTable(const GrGLContextInfo& ctxInfo) {
 376
 377     // OpenGL < 3.0
 378     //  no support for render targets unless the GL_ARB_framebuffer_object
 379     //  extension is supported (in which case we get ALPHA, RED, RG, RGB,
 380     //  RGBA (ALPHA8, RGBA4, RGBA8) for OpenGL > 1.1). Note that we
 381     //  probably don't get R8 in this case.
 382
 383     // OpenGL 3.0
 384     //  base color renderable: ALPHA, RED, RG, RGB, and RGBA
 385     //  sized derivatives: ALPHA8, R8, RGBA4, RGBA8
 386
 387     // >= OpenGL 3.1
 388     //  base color renderable: RED, RG, RGB, and RGBA
 389     //  sized derivatives: R8, RGBA4, RGBA8
 390     //  if the GL_ARB_compatibility extension is supported then we get back
 391     //  support for GL_ALPHA and ALPHA8
 392
 393     // GL_EXT_bgra adds BGRA render targets to any version
 394
 395     // ES 2.0
 396     //  color renderable: RGBA4, RGB5_A1, RGB565
 397     //  GL_EXT_texture_rg adds support for R8 as a color render target
 398     //  GL_OES_rgb8_rgba8 and/or GL_ARM_rgba8 adds support for RGBA8
 399     //  GL_EXT_texture_format_BGRA8888 and/or GL_APPLE_texture_format_BGRA8888 added BGRA support
 400
 401     // ES 3.0
 402     // Same as ES 2.0 except R8 and RGBA8 are supported without extensions (the functions called
 403     // below already account for this).
 404
 405     enum {
 406         kNo_MSAA = 0,
 407         kYes_MSAA = 1,
 408     };
 409
 410     if (kGL_GrGLStandard == ctxInfo.standard()) {
 411         // Post 3.0 we will get R8
 412         // Prior to 3.0 we will get ALPHA8 (with GL_ARB_framebuffer_object)
 413         if (ctxInfo.version() >= GR_GL_VER(3,0) ||
 414             ctxInfo.hasExtension("GL_ARB_framebuffer_object")) {
 415             fConfigRenderSupport[kAlpha_8_GrPixelConfig][kNo_MSAA] = true;
 416             fConfigRenderSupport[kAlpha_8_GrPixelConfig][kYes_MSAA] = true;
 417         }
 418     } else {
 419         // On ES we can only hope for R8
 420         fConfigRenderSupport[kAlpha_8_GrPixelConfig][kNo_MSAA] = fTextureRedSupport;
 421         fConfigRenderSupport[kAlpha_8_GrPixelConfig][kYes_MSAA] = fTextureRedSupport;
 422     }
 423
 424     if (kGL_GrGLStandard != ctxInfo.standard()) {
 425         // only available in ES
 426         fConfigRenderSupport[kRGB_565_GrPixelConfig][kNo_MSAA] = true;
 427         fConfigRenderSupport[kRGB_565_GrPixelConfig][kYes_MSAA] = true;
 428     }
 429
 430     // we no longer support 444 as a render target
 431     fConfigRenderSupport[kRGBA_4444_GrPixelConfig][kNo_MSAA]  = false;
 432     fConfigRenderSupport[kRGBA_4444_GrPixelConfig][kYes_MSAA]  = false;
 433
 434     if (this->fRGBA8RenderbufferSupport) {
 435         fConfigRenderSupport[kRGBA_8888_GrPixelConfig][kNo_MSAA]  = true;
 436         fConfigRenderSupport[kRGBA_8888_GrPixelConfig][kYes_MSAA]  = true;
 437     }
 438
 439     if (this->fBGRAFormatSupport) {
 440         fConfigRenderSupport[kBGRA_8888_GrPixelConfig][kNo_MSAA]  = true;
 441         // The GL_EXT_texture_format_BGRA8888 extension does not add BGRA to the list of
 442         // configs that are color-renderable and can be passed to glRenderBufferStorageMultisample.
 443         // Chromium may have an extension to allow BGRA renderbuffers to work on desktop platforms.
 444         if (ctxInfo.hasExtension("GL_CHROMIUM_renderbuffer_format_BGRA8888")) {
 445             fConfigRenderSupport[kBGRA_8888_GrPixelConfig][kYes_MSAA] = true;
 446         } else {
 447             fConfigRenderSupport[kBGRA_8888_GrPixelConfig][kYes_MSAA] =
 448                 !fBGRAIsInternalFormat || !this->usesMSAARenderBuffers();
 449         }
 450     }
 451
 452     // If we don't support MSAA then undo any places above where we set a config as renderable with
 453     // msaa.
 454     if (kNone_MSFBOType == fMSFBOType) {
 455         for (int i = 0; i < kGrPixelConfigCnt; ++i) {
 456             fConfigRenderSupport[i][kYes_MSAA] = false;
 457         }
 458     }
 459 }
 460
 461 bool GrGLCaps::readPixelsSupported(const GrGLInterface* intf,
 462                                    GrGLenum format,
 463                                    GrGLenum type) const {
 464     if (GR_GL_RGBA == format && GR_GL_UNSIGNED_BYTE == type) {
 465         // ES 2 guarantees this format is supported
 466         return true;
 467     }
 468
 469     if (!fTwoFormatLimit) {
 470         // not limited by ES 2's constraints
 471         return true;
 472     }
 473
 474     GrGLint otherFormat = GR_GL_RGBA;
 475     GrGLint otherType = GR_GL_UNSIGNED_BYTE;
 476
 477     // The other supported format/type combo supported for ReadPixels
 478     // can change based on which render target is bound
 479     GR_GL_GetIntegerv(intf,
 480                       GR_GL_IMPLEMENTATION_COLOR_READ_FORMAT,
 481                       &otherFormat);
 482
 483     GR_GL_GetIntegerv(intf,
 484                       GR_GL_IMPLEMENTATION_COLOR_READ_TYPE,
 485                       &otherType);
 486
 487     return (GrGLenum)otherFormat == format && (GrGLenum)otherType == type;
 488 }
 489
 490 void GrGLCaps::initFSAASupport(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
 491
 492     fMSFBOType = kNone_MSFBOType;
 493     if (kGL_GrGLStandard != ctxInfo.standard()) {
 494         // We prefer the EXT/IMG extension over ES3 MSAA because we've observed
 495         // ES3 driver bugs on at least one device with a tiled GPU (N10).
 496         if (ctxInfo.hasExtension("GL_EXT_multisampled_render_to_texture")) {
 497             fMSFBOType = kES_EXT_MsToTexture_MSFBOType;
 498         } else if (ctxInfo.hasExtension("GL_IMG_multisampled_render_to_texture")) {
 499             fMSFBOType = kES_IMG_MsToTexture_MSFBOType;
 500         } else if (ctxInfo.version() >= GR_GL_VER(3,0)) {
 501             fMSFBOType = GrGLCaps::kES_3_0_MSFBOType;
 502         } else if (ctxInfo.hasExtension("GL_CHROMIUM_framebuffer_multisample")) {
 503             // chrome's extension is equivalent to the EXT msaa
 504             // and fbo_blit extensions.
 505             fMSFBOType = kDesktop_EXT_MSFBOType;
 506         } else if (ctxInfo.hasExtension("GL_APPLE_framebuffer_multisample")) {
 507             fMSFBOType = kES_Apple_MSFBOType;
 508         }
 509     } else {
 510         if ((ctxInfo.version() >= GR_GL_VER(3,0)) ||
 511             ctxInfo.hasExtension("GL_ARB_framebuffer_object")) {
 512             fMSFBOType = GrGLCaps::kDesktop_ARB_MSFBOType;
 513         } else if (ctxInfo.hasExtension("GL_EXT_framebuffer_multisample") &&
 514                    ctxInfo.hasExtension("GL_EXT_framebuffer_blit")) {
 515             fMSFBOType = GrGLCaps::kDesktop_EXT_MSFBOType;
 516         }
 517     }
 518 }
 519
 520 namespace {
 521 const GrGLuint kUnknownBitCount = GrGLStencilBuffer::kUnknownBitCount;
 522 }
 523
 524 void GrGLCaps::initStencilFormats(const GrGLContextInfo& ctxInfo) {
 525
 526     // Build up list of legal stencil formats (though perhaps not supported on
 527     // the particular gpu/driver) from most preferred to least.
 528
 529     // these consts are in order of most preferred to least preferred
 530     // we don't bother with GL_STENCIL_INDEX1 or GL_DEPTH32F_STENCIL8
 531
 532     static const StencilFormat
 533                   // internal Format      stencil bits      total bits        packed?
 534         gS8    = {GR_GL_STENCIL_INDEX8,   8,                8,                false},
 535         gS16   = {GR_GL_STENCIL_INDEX16,  16,               16,               false},
 536         gD24S8 = {GR_GL_DEPTH24_STENCIL8, 8,                32,               true },
 537         gS4    = {GR_GL_STENCIL_INDEX4,   4,                4,                false},
 538     //  gS     = {GR_GL_STENCIL_INDEX,    kUnknownBitCount, kUnknownBitCount, false},
 539         gDS    = {GR_GL_DEPTH_STENCIL,    kUnknownBitCount, kUnknownBitCount, true };
 540
 541     if (kGL_GrGLStandard == ctxInfo.standard()) {
 542         bool supportsPackedDS =
 543             ctxInfo.version() >= GR_GL_VER(3,0) ||
 544             ctxInfo.hasExtension("GL_EXT_packed_depth_stencil") ||
 545             ctxInfo.hasExtension("GL_ARB_framebuffer_object");
 546
 547         // S1 thru S16 formats are in GL 3.0+, EXT_FBO, and ARB_FBO since we
 548         // require FBO support we can expect these are legal formats and don't
 549         // check. These also all support the unsized GL_STENCIL_INDEX.
 550         fStencilFormats.push_back() = gS8;
 551         fStencilFormats.push_back() = gS16;
 552         if (supportsPackedDS) {
 553             fStencilFormats.push_back() = gD24S8;
 554         }
 555         fStencilFormats.push_back() = gS4;
 556         if (supportsPackedDS) {
 557             fStencilFormats.push_back() = gDS;
 558         }
 559     } else {
 560         // ES2 has STENCIL_INDEX8 without extensions but requires extensions
 561         // for other formats.
 562         // ES doesn't support using the unsized format.
 563
 564         fStencilFormats.push_back() = gS8;
 565         //fStencilFormats.push_back() = gS16;
 566         if (ctxInfo.version() >= GR_GL_VER(3,0) ||
 567             ctxInfo.hasExtension("GL_OES_packed_depth_stencil")) {
 568             fStencilFormats.push_back() = gD24S8;
 569         }
 570         if (ctxInfo.hasExtension("GL_OES_stencil4")) {
 571             fStencilFormats.push_back() = gS4;
 572         }
 573     }
 574     SkASSERT(0 == fStencilVerifiedColorConfigs.count());
 575     fStencilVerifiedColorConfigs.push_back_n(fStencilFormats.count());
 576 }
 577
 578 void GrGLCaps::markColorConfigAndStencilFormatAsVerified(
 579                                     GrPixelConfig config,
 580                                     const GrGLStencilBuffer::Format& format) {
 581 #if !GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT
 582     return;
 583 #endif
 584     SkASSERT((unsigned)config < (unsigned)kGrPixelConfigCnt);
 585     SkASSERT(fStencilFormats.count() == fStencilVerifiedColorConfigs.count());
 586     int count = fStencilFormats.count();
 587     // we expect a really small number of possible formats so linear search
 588     // should be OK
 589     SkASSERT(count < 16);
 590     for (int i = 0; i < count; ++i) {
 591         if (format.fInternalFormat ==
 592             fStencilFormats[i].fInternalFormat) {
 593             fStencilVerifiedColorConfigs[i].markVerified(config);
 594             return;
 595         }
 596     }
 597     SkFAIL("Why are we seeing a stencil format that "
 598             "GrGLCaps doesn't know about.");
 599 }
 600
 601 bool GrGLCaps::isColorConfigAndStencilFormatVerified(
 602                                 GrPixelConfig config,
 603                                 const GrGLStencilBuffer::Format& format) const {
 604 #if !GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT
 605     return false;
 606 #endif
 607     SkASSERT((unsigned)config < (unsigned)kGrPixelConfigCnt);
 608     int count = fStencilFormats.count();
 609     // we expect a really small number of possible formats so linear search
 610     // should be OK
 611     SkASSERT(count < 16);
 612     for (int i = 0; i < count; ++i) {
 613         if (format.fInternalFormat ==
 614             fStencilFormats[i].fInternalFormat) {
 615             return fStencilVerifiedColorConfigs[i].isVerified(config);
 616         }
 617     }
 618     SkFAIL("Why are we seeing a stencil format that "
 619             "GLCaps doesn't know about.");
 620     return false;
 621 }
 622
 623 SkString GrGLCaps::dump() const {
 624
 625     SkString r = INHERITED::dump();
 626
 627     r.appendf("--- GL-Specific ---\n");
 628     for (int i = 0; i < fStencilFormats.count(); ++i) {
 629         r.appendf("Stencil Format %d, stencil bits: %02d, total bits: %02d\n",
 630                  i,
 631                  fStencilFormats[i].fStencilBits,
 632                  fStencilFormats[i].fTotalBits);
 633     }
 634
 635     static const char* kMSFBOExtStr[] = {
 636         "None",
 637         "ARB",
 638         "EXT",
 639         "ES 3.0",
 640         "Apple",
 641         "IMG MS To Texture",
 642         "EXT MS To Texture",
 643     };
 644     GR_STATIC_ASSERT(0 == kNone_MSFBOType);
 645     GR_STATIC_ASSERT(1 == kDesktop_ARB_MSFBOType);
 646     GR_STATIC_ASSERT(2 == kDesktop_EXT_MSFBOType);
 647     GR_STATIC_ASSERT(3 == kES_3_0_MSFBOType);
 648     GR_STATIC_ASSERT(4 == kES_Apple_MSFBOType);
 649     GR_STATIC_ASSERT(5 == kES_IMG_MsToTexture_MSFBOType);
 650     GR_STATIC_ASSERT(6 == kES_EXT_MsToTexture_MSFBOType);
 651     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kMSFBOExtStr) == kLast_MSFBOType + 1);
 652
 653     static const char* kFBFetchTypeStr[] = {
 654         "None",
 655         "EXT",
 656         "NV",
 657     };
 658     GR_STATIC_ASSERT(0 == kNone_FBFetchType);
 659     GR_STATIC_ASSERT(1 == kEXT_FBFetchType);
 660     GR_STATIC_ASSERT(2 == kNV_FBFetchType);
 661     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kFBFetchTypeStr) == kLast_FBFetchType + 1);
 662
 663     static const char* kInvalidateFBTypeStr[] = {
 664         "None",
 665         "Discard",
 666         "Invalidate",
 667     };
 668     GR_STATIC_ASSERT(0 == kNone_InvalidateFBType);
 669     GR_STATIC_ASSERT(1 == kDiscard_InvalidateFBType);
 670     GR_STATIC_ASSERT(2 == kInvalidate_InvalidateFBType);
 671     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kInvalidateFBTypeStr) == kLast_InvalidateFBType + 1);
 672
 673     static const char* kMapBufferTypeStr[] = {
 674         "None",
 675         "MapBuffer",
 676         "MapBufferRange",
 677         "Chromium",
 678     };
 679     GR_STATIC_ASSERT(0 == kNone_MapBufferType);
 680     GR_STATIC_ASSERT(1 == kMapBuffer_MapBufferType);
 681     GR_STATIC_ASSERT(2 == kMapBufferRange_MapBufferType);
 682     GR_STATIC_ASSERT(3 == kChromium_MapBufferType);
 683     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kMapBufferTypeStr) == kLast_MapBufferType + 1);
 684
 685     r.appendf("Core Profile: %s\n", (fIsCoreProfile ? "YES" : "NO"));
 686     r.appendf("MSAA Type: %s\n", kMSFBOExtStr[fMSFBOType]);
 687     r.appendf("FB Fetch Type: %s\n", kFBFetchTypeStr[fFBFetchType]);
 688     r.appendf("Invalidate FB Type: %s\n", kInvalidateFBTypeStr[fInvalidateFBType]);
 689     r.appendf("Map Buffer Type: %s\n", kMapBufferTypeStr[fMapBufferType]);
 690     r.appendf("Max FS Uniform Vectors: %d\n", fMaxFragmentUniformVectors);
 691     r.appendf("Max FS Texture Units: %d\n", fMaxFragmentTextureUnits);
 692     if (!fIsCoreProfile) {
 693         r.appendf("Max Fixed Function Texture Coords: %d\n", fMaxFixedFunctionTextureCoords);
 694     }
 695     r.appendf("Max Vertex Attributes: %d\n", fMaxVertexAttributes);
 696     r.appendf("Support RGBA8 Render Buffer: %s\n", (fRGBA8RenderbufferSupport ? "YES": "NO"));
 697     r.appendf("BGRA support: %s\n", (fBGRAFormatSupport ? "YES": "NO"));
 698     r.appendf("BGRA is an internal format: %s\n", (fBGRAIsInternalFormat ? "YES": "NO"));
 699     r.appendf("Support texture swizzle: %s\n", (fTextureSwizzleSupport ? "YES": "NO"));
 700     r.appendf("Unpack Row length support: %s\n", (fUnpackRowLengthSupport ? "YES": "NO"));
 701     r.appendf("Unpack Flip Y support: %s\n", (fUnpackFlipYSupport ? "YES": "NO"));
 702     r.appendf("Pack Row length support: %s\n", (fPackRowLengthSupport ? "YES": "NO"));
 703     r.appendf("Pack Flip Y support: %s\n", (fPackFlipYSupport ? "YES": "NO"));
 704
 705     r.appendf("Texture Usage support: %s\n", (fTextureUsageSupport ? "YES": "NO"));
 706     r.appendf("Texture Storage support: %s\n", (fTexStorageSupport ? "YES": "NO"));
 707     r.appendf("GL_R support: %s\n", (fTextureRedSupport ? "YES": "NO"));
 708     r.appendf("GL_ARB_imaging support: %s\n", (fImagingSupport ? "YES": "NO"));
 709     r.appendf("Two Format Limit: %s\n", (fTwoFormatLimit ? "YES": "NO"));
 710     r.appendf("Fragment coord conventions support: %s\n",
 711              (fFragCoordsConventionSupport ? "YES": "NO"));
 712     r.appendf("Vertex array object support: %s\n", (fVertexArrayObjectSupport ? "YES": "NO"));
 713     r.appendf("Use non-VBO for dynamic data: %s\n",
 714              (fUseNonVBOVertexAndIndexDynamicData ? "YES" : "NO"));
 715     r.appendf("Full screen clear is free: %s\n", (fFullClearIsFree ? "YES" : "NO"));
 716     r.appendf("Drops tile on zero divide: %s\n", (fDropsTileOnZeroDivide ? "YES" : "NO"));
 717     return r;
 718 }