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
  11 #include "GrGLContext.h"
  12 #include "SkTSearch.h"
  13 #include "SkTSort.h"
  14
  15 GrGLCaps::GrGLCaps() {
  16     this->reset();
  17 }
  18
  19 void GrGLCaps::reset() {
  20     INHERITED::reset();
  21
  22     fVerifiedColorConfigs.reset();
  23     fStencilFormats.reset();
  24     fStencilVerifiedColorConfigs.reset();
  25     fMSFBOType = kNone_MSFBOType;
  26     fInvalidateFBType = kNone_InvalidateFBType;
  27     fLATCAlias = kLATC_LATCAlias;
  28     fMapBufferType = kNone_MapBufferType;
  29     fMaxFragmentUniformVectors = 0;
  30     fMaxVertexAttributes = 0;
  31     fMaxFragmentTextureUnits = 0;
  32     fMaxFixedFunctionTextureCoords = 0;
  33     fRGBA8RenderbufferSupport = 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     fFBFetchSupport = false;
  52     fFBFetchColorName = NULL;
  53     fFBFetchExtensionString = NULL;
  54
  55     fReadPixelsSupportedCache.reset();
  56 }
  57
  58 GrGLCaps::GrGLCaps(const GrGLCaps& caps) : GrDrawTargetCaps() {
  59     *this = caps;
  60 }
  61
  62 GrGLCaps& GrGLCaps::operator= (const GrGLCaps& caps) {
  63     INHERITED::operator=(caps);
  64     fVerifiedColorConfigs = caps.fVerifiedColorConfigs;
  65     fStencilFormats = caps.fStencilFormats;
  66     fStencilVerifiedColorConfigs = caps.fStencilVerifiedColorConfigs;
  67     fLATCAlias = caps.fLATCAlias;
  68     fMaxFragmentUniformVectors = caps.fMaxFragmentUniformVectors;
  69     fMaxVertexAttributes = caps.fMaxVertexAttributes;
  70     fMaxFragmentTextureUnits = caps.fMaxFragmentTextureUnits;
  71     fMaxFixedFunctionTextureCoords = caps.fMaxFixedFunctionTextureCoords;
  72     fMSFBOType = caps.fMSFBOType;
  73     fInvalidateFBType = caps.fInvalidateFBType;
  74     fMapBufferType = caps.fMapBufferType;
  75     fRGBA8RenderbufferSupport = caps.fRGBA8RenderbufferSupport;
  76     fBGRAIsInternalFormat = caps.fBGRAIsInternalFormat;
  77     fTextureSwizzleSupport = caps.fTextureSwizzleSupport;
  78     fUnpackRowLengthSupport = caps.fUnpackRowLengthSupport;
  79     fUnpackFlipYSupport = caps.fUnpackFlipYSupport;
  80     fPackRowLengthSupport = caps.fPackRowLengthSupport;
  81     fPackFlipYSupport = caps.fPackFlipYSupport;
  82     fTextureUsageSupport = caps.fTextureUsageSupport;
  83     fTexStorageSupport = caps.fTexStorageSupport;
  84     fTextureRedSupport = caps.fTextureRedSupport;
  85     fImagingSupport = caps.fImagingSupport;
  86     fTwoFormatLimit = caps.fTwoFormatLimit;
  87     fFragCoordsConventionSupport = caps.fFragCoordsConventionSupport;
  88     fVertexArrayObjectSupport = caps.fVertexArrayObjectSupport;
  89     fUseNonVBOVertexAndIndexDynamicData = caps.fUseNonVBOVertexAndIndexDynamicData;
  90     fIsCoreProfile = caps.fIsCoreProfile;
  91     fFullClearIsFree = caps.fFullClearIsFree;
  92     fDropsTileOnZeroDivide = caps.fDropsTileOnZeroDivide;
  93     fFBFetchSupport = caps.fFBFetchSupport;
  94     fFBFetchColorName = caps.fFBFetchColorName;
  95     fFBFetchExtensionString = caps.fFBFetchExtensionString;
  96
  97     return *this;
  98 }
  99
 100 bool GrGLCaps::init(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
 101
 102     this->reset();
 103     if (!ctxInfo.isInitialized()) {
 104         return false;
 105     }
 106
 107     GrGLStandard standard = ctxInfo.standard();
 108     GrGLVersion version = ctxInfo.version();
 109
 110     /**************************************************************************
 111      * Caps specific to GrGLCaps
 112      **************************************************************************/
 113
 114     if (kGLES_GrGLStandard == standard) {
 115         GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_UNIFORM_VECTORS,
 116                           &fMaxFragmentUniformVectors);
 117     } else {
 118         SkASSERT(kGL_GrGLStandard == standard);
 119         GrGLint max;
 120         GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, &max);
 121         fMaxFragmentUniformVectors = max / 4;
 122         if (version >= GR_GL_VER(3, 2)) {
 123             GrGLint profileMask;
 124             GR_GL_GetIntegerv(gli, GR_GL_CONTEXT_PROFILE_MASK, &profileMask);
 125             fIsCoreProfile = SkToBool(profileMask & GR_GL_CONTEXT_CORE_PROFILE_BIT);
 126         }
 127         if (!fIsCoreProfile) {
 128             GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_COORDS, &fMaxFixedFunctionTextureCoords);
 129             // Sanity check
 130             SkASSERT(fMaxFixedFunctionTextureCoords > 0 && fMaxFixedFunctionTextureCoords < 128);
 131         }
 132     }
 133     GR_GL_GetIntegerv(gli, GR_GL_MAX_VERTEX_ATTRIBS, &fMaxVertexAttributes);
 134     GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_IMAGE_UNITS, &fMaxFragmentTextureUnits);
 135
 136     if (kGL_GrGLStandard == standard) {
 137         fRGBA8RenderbufferSupport = true;
 138     } else {
 139         fRGBA8RenderbufferSupport = version >= GR_GL_VER(3,0) ||
 140                                     ctxInfo.hasExtension("GL_OES_rgb8_rgba8") ||
 141                                     ctxInfo.hasExtension("GL_ARM_rgba8");
 142     }
 143
 144     if (kGL_GrGLStandard == standard) {
 145         fTextureSwizzleSupport = version >= GR_GL_VER(3,3) ||
 146                                  ctxInfo.hasExtension("GL_ARB_texture_swizzle");
 147     } else {
 148         fTextureSwizzleSupport = version >= GR_GL_VER(3,0);
 149     }
 150
 151     if (kGL_GrGLStandard == standard) {
 152         fUnpackRowLengthSupport = true;
 153         fUnpackFlipYSupport = false;
 154         fPackRowLengthSupport = true;
 155         fPackFlipYSupport = false;
 156     } else {
 157         fUnpackRowLengthSupport = version >= GR_GL_VER(3,0) ||
 158                                   ctxInfo.hasExtension("GL_EXT_unpack_subimage");
 159         fUnpackFlipYSupport = ctxInfo.hasExtension("GL_CHROMIUM_flipy");
 160         fPackRowLengthSupport = version >= GR_GL_VER(3,0) ||
 161                                 ctxInfo.hasExtension("GL_NV_pack_subimage");
 162         fPackFlipYSupport =
 163             ctxInfo.hasExtension("GL_ANGLE_pack_reverse_row_order");
 164     }
 165
 166     fTextureUsageSupport = (kGLES_GrGLStandard == standard) &&
 167                             ctxInfo.hasExtension("GL_ANGLE_texture_usage");
 168
 169     if (kGL_GrGLStandard == standard) {
 170         // The EXT version can apply to either GL or GLES.
 171         fTexStorageSupport = version >= GR_GL_VER(4,2) ||
 172                              ctxInfo.hasExtension("GL_ARB_texture_storage") ||
 173                              ctxInfo.hasExtension("GL_EXT_texture_storage");
 174     } else {
 175         // Qualcomm Adreno drivers appear to have issues with texture storage.
 176         fTexStorageSupport = (version >= GR_GL_VER(3,0) &&
 177                               kQualcomm_GrGLVendor != ctxInfo.vendor()) ||
 178                              ctxInfo.hasExtension("GL_EXT_texture_storage");
 179     }
 180
 181     // ARB_texture_rg is part of OpenGL 3.0, but mesa doesn't support it if
 182     // it doesn't have ARB_texture_rg extension.
 183     if (kGL_GrGLStandard == standard) {
 184         if (ctxInfo.isMesa()) {
 185             fTextureRedSupport = ctxInfo.hasExtension("GL_ARB_texture_rg");
 186         } else {
 187             fTextureRedSupport = version >= GR_GL_VER(3,0) ||
 188                                  ctxInfo.hasExtension("GL_ARB_texture_rg");
 189         }
 190     } else {
 191         fTextureRedSupport =  version >= GR_GL_VER(3,0) ||
 192                               ctxInfo.hasExtension("GL_EXT_texture_rg");
 193     }
 194
 195     fImagingSupport = kGL_GrGLStandard == standard &&
 196                       ctxInfo.hasExtension("GL_ARB_imaging");
 197
 198     // ES 2 only guarantees RGBA/uchar + one other format/type combo for
 199     // ReadPixels. The other format has to checked at run-time since it
 200     // can change based on which render target is bound
 201     fTwoFormatLimit = kGLES_GrGLStandard == standard;
 202
 203     // Frag Coords Convention support is not part of ES
 204     // Known issue on at least some Intel platforms:
 205     // http://code.google.com/p/skia/issues/detail?id=946
 206     if (kIntel_GrGLVendor != ctxInfo.vendor() && kGLES_GrGLStandard != standard) {
 207         fFragCoordsConventionSupport = ctxInfo.glslGeneration() >= k150_GrGLSLGeneration ||
 208                                        ctxInfo.hasExtension("GL_ARB_fragment_coord_conventions");
 209     }
 210
 211     // SGX and Mali GPUs that are based on a tiled-deferred architecture that have trouble with
 212     // frequently changing VBOs. We've measured a performance increase using non-VBO vertex
 213     // data for dynamic content on these GPUs. Perhaps we should read the renderer string and
 214     // limit this decision to specific GPU families rather than basing it on the vendor alone.
 215     if (!GR_GL_MUST_USE_VBO &&
 216         (kARM_GrGLVendor == ctxInfo.vendor() ||
 217          kImagination_GrGLVendor == ctxInfo.vendor() ||
 218          kQualcomm_GrGLVendor == ctxInfo.vendor())) {
 219         fUseNonVBOVertexAndIndexDynamicData = true;
 220     }
 221
 222     if ((kGL_GrGLStandard == standard && version >= GR_GL_VER(4,3)) ||
 223         (kGLES_GrGLStandard == standard && version >= GR_GL_VER(3,0)) ||
 224         ctxInfo.hasExtension("GL_ARB_invalidate_subdata")) {
 225         fDiscardRenderTargetSupport = true;
 226         fInvalidateFBType = kInvalidate_InvalidateFBType;
 227     } else if (ctxInfo.hasExtension("GL_EXT_discard_framebuffer")) {
 228         fDiscardRenderTargetSupport = true;
 229         fInvalidateFBType = kDiscard_InvalidateFBType;
 230     }
 231
 232     if (kARM_GrGLVendor == ctxInfo.vendor() || kImagination_GrGLVendor == ctxInfo.vendor()) {
 233         fFullClearIsFree = true;
 234     }
 235
 236     if (kGL_GrGLStandard == standard) {
 237         fVertexArrayObjectSupport = version >= GR_GL_VER(3, 0) ||
 238                                     ctxInfo.hasExtension("GL_ARB_vertex_array_object");
 239     } else {
 240         fVertexArrayObjectSupport = version >= GR_GL_VER(3, 0) ||
 241                                     ctxInfo.hasExtension("GL_OES_vertex_array_object");
 242     }
 243
 244     if (kGLES_GrGLStandard == standard) {
 245         if (ctxInfo.hasExtension("GL_EXT_shader_framebuffer_fetch")) {
 246             fFBFetchSupport = true;
 247             fFBFetchColorName = "gl_LastFragData[0]";
 248             fFBFetchExtensionString = "GL_EXT_shader_framebuffer_fetch";
 249         } else if (ctxInfo.hasExtension("GL_NV_shader_framebuffer_fetch")) {
 250             fFBFetchSupport = true;
 251             fFBFetchColorName = "gl_LastFragData[0]";
 252             fFBFetchExtensionString = "GL_NV_shader_framebuffer_fetch";
 253         } else if (ctxInfo.hasExtension("GL_ARM_shader_framebuffer_fetch")) {
 254             // The arm extension also requires an additional flag which we will set onResetContext
 255             // This is all temporary.
 256             fFBFetchSupport = true;
 257             fFBFetchColorName = "gl_LastFragColorARM";
 258             fFBFetchExtensionString = "GL_ARM_shader_framebuffer_fetch";
 259         }
 260     }
 261
 262     // Adreno GPUs have a tendency to drop tiles when there is a divide-by-zero in a shader
 263     fDropsTileOnZeroDivide = kQualcomm_GrGLVendor == ctxInfo.vendor();
 264
 265     this->initFSAASupport(ctxInfo, gli);
 266     this->initStencilFormats(ctxInfo);
 267
 268     /**************************************************************************
 269      * GrDrawTargetCaps fields
 270      **************************************************************************/
 271     if (kGL_GrGLStandard == standard) {
 272         // we could also look for GL_ATI_separate_stencil extension or
 273         // GL_EXT_stencil_two_side but they use different function signatures
 274         // than GL2.0+ (and than each other).
 275         fTwoSidedStencilSupport = (ctxInfo.version() >= GR_GL_VER(2,0));
 276         // supported on GL 1.4 and higher or by extension
 277         fStencilWrapOpsSupport = (ctxInfo.version() >= GR_GL_VER(1,4)) ||
 278                                   ctxInfo.hasExtension("GL_EXT_stencil_wrap");
 279     } else {
 280         // ES 2 has two sided stencil and stencil wrap
 281         fTwoSidedStencilSupport = true;
 282         fStencilWrapOpsSupport = true;
 283     }
 284
 285     if (kGL_GrGLStandard == standard) {
 286         fMapBufferFlags = kCanMap_MapFlag; // we require VBO support and the desktop VBO
 287                                             // extension includes glMapBuffer.
 288         if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_ARB_map_buffer_range")) {
 289             fMapBufferFlags |= kSubset_MapFlag;
 290             fMapBufferType = kMapBufferRange_MapBufferType;
 291         } else {
 292             fMapBufferType = kMapBuffer_MapBufferType;
 293         }
 294     } else {
 295         // Unextended GLES2 doesn't have any buffer mapping.
 296         fMapBufferFlags = kNone_MapBufferType;
 297         if (ctxInfo.hasExtension("GL_CHROMIUM_map_sub")) {
 298             fMapBufferFlags = kCanMap_MapFlag | kSubset_MapFlag;
 299             fMapBufferType = kChromium_MapBufferType;
 300         } else if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_EXT_map_buffer_range")) {
 301             fMapBufferFlags = kCanMap_MapFlag | kSubset_MapFlag;
 302             fMapBufferType = kMapBufferRange_MapBufferType;
 303         } else if (ctxInfo.hasExtension("GL_OES_mapbuffer")) {
 304             fMapBufferFlags = kCanMap_MapFlag;
 305             fMapBufferType = kMapBuffer_MapBufferType;
 306         }
 307     }
 308
 309     if (kGL_GrGLStandard == standard) {
 310         SkASSERT(ctxInfo.version() >= GR_GL_VER(2,0) ||
 311                  ctxInfo.hasExtension("GL_ARB_texture_non_power_of_two"));
 312         fNPOTTextureTileSupport = true;
 313         fMipMapSupport = true;
 314     } else {
 315         // Unextended ES2 supports NPOT textures with clamp_to_edge and non-mip filters only
 316         // ES3 has no limitations.
 317         fNPOTTextureTileSupport = ctxInfo.version() >= GR_GL_VER(3,0) ||
 318                                   ctxInfo.hasExtension("GL_OES_texture_npot");
 319         // ES2 supports MIP mapping for POT textures but our caps don't allow for limited MIP
 320         // support. The OES extension or ES 3.0 allow for MIPS on NPOT textures. So, apparently,
 321         // does the undocumented GL_IMG_texture_npot extension. This extension does not seem to
 322         // to alllow arbitrary wrap modes, however.
 323         fMipMapSupport = fNPOTTextureTileSupport || ctxInfo.hasExtension("GL_IMG_texture_npot");
 324     }
 325
 326     fHWAALineSupport = (kGL_GrGLStandard == standard);
 327
 328     GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_SIZE, &fMaxTextureSize);
 329     GR_GL_GetIntegerv(gli, GR_GL_MAX_RENDERBUFFER_SIZE, &fMaxRenderTargetSize);
 330     // Our render targets are always created with textures as the color
 331     // attachment, hence this min:
 332     fMaxRenderTargetSize = SkTMin(fMaxTextureSize, fMaxRenderTargetSize);
 333
 334     fPathRenderingSupport = ctxInfo.hasExtension("GL_NV_path_rendering");
 335
 336     if (fPathRenderingSupport) {
 337         if (kGL_GrGLStandard == standard) {
 338             // We need one of the two possible texturing methods: using fixed function pipeline
 339             // (PathTexGen, texcoords, ...)  or using the newer NVPR API additions that support
 340             // setting individual fragment inputs with ProgramPathFragmentInputGen. The API
 341             // additions are detected by checking the existence of the function. Eventually we may
 342             // choose to remove the fixed function codepath.
 343             // Set fMaxFixedFunctionTextureCoords = 0 here if you want to force
 344             // ProgramPathFragmentInputGen usage on desktop.
 345             fPathRenderingSupport = ctxInfo.hasExtension("GL_EXT_direct_state_access") &&
 346                 (fMaxFixedFunctionTextureCoords > 0 ||
 347                  ((ctxInfo.version() >= GR_GL_VER(4,3) ||
 348                    ctxInfo.hasExtension("GL_ARB_program_interface_query")) &&
 349                   gli->fFunctions.fProgramPathFragmentInputGen));
 350         } else {
 351             fPathRenderingSupport = ctxInfo.version() >= GR_GL_VER(3,1);
 352         }
 353     }
 354
 355     fGpuTracingSupport = ctxInfo.hasExtension("GL_EXT_debug_marker");
 356
 357     // For now these two are equivalent but we could have dst read in shader via some other method
 358     fDstReadInShaderSupport = fFBFetchSupport;
 359
 360     // Disable scratch texture reuse on Mali and Adreno devices
 361     fReuseScratchTextures = kARM_GrGLVendor != ctxInfo.vendor() &&
 362                             kQualcomm_GrGLVendor != ctxInfo.vendor();
 363
 364     // Enable supported shader-related caps
 365     if (kGL_GrGLStandard == standard) {
 366         fDualSourceBlendingSupport = ctxInfo.version() >= GR_GL_VER(3,3) ||
 367                                      ctxInfo.hasExtension("GL_ARB_blend_func_extended");
 368         fShaderDerivativeSupport = true;
 369         // we don't support GL_ARB_geometry_shader4, just GL 3.2+ GS
 370         fGeometryShaderSupport = ctxInfo.version() >= GR_GL_VER(3,2) &&
 371                                  ctxInfo.glslGeneration() >= k150_GrGLSLGeneration;
 372     } else {
 373         fShaderDerivativeSupport = ctxInfo.version() >= GR_GL_VER(3, 0) ||
 374                                    ctxInfo.hasExtension("GL_OES_standard_derivatives");
 375     }
 376
 377     if (GrGLCaps::kES_IMG_MsToTexture_MSFBOType == fMSFBOType) {
 378         GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES_IMG, &fMaxSampleCount);
 379     } else if (GrGLCaps::kNone_MSFBOType != fMSFBOType) {
 380         GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES, &fMaxSampleCount);
 381     }
 382
 383     if (kPowerVR54x_GrGLRenderer == ctxInfo.renderer() ||
 384         kPowerVRRogue_GrGLRenderer == ctxInfo.renderer()) {
 385         fUseDrawInsteadOfClear = true;
 386     }
 387
 388     this->initConfigTexturableTable(ctxInfo, gli);
 389     this->initConfigRenderableTable(ctxInfo);
 390
 391     return true;
 392 }
 393
 394 void GrGLCaps::initConfigRenderableTable(const GrGLContextInfo& ctxInfo) {
 395
 396     // OpenGL < 3.0
 397     //  no support for render targets unless the GL_ARB_framebuffer_object
 398     //  extension is supported (in which case we get ALPHA, RED, RG, RGB,
 399     //  RGBA (ALPHA8, RGBA4, RGBA8) for OpenGL > 1.1). Note that we
 400     //  probably don't get R8 in this case.
 401
 402     // OpenGL 3.0
 403     //  base color renderable: ALPHA, RED, RG, RGB, and RGBA
 404     //  sized derivatives: ALPHA8, R8, RGBA4, RGBA8
 405
 406     // >= OpenGL 3.1
 407     //  base color renderable: RED, RG, RGB, and RGBA
 408     //  sized derivatives: R8, RGBA4, RGBA8
 409     //  if the GL_ARB_compatibility extension is supported then we get back
 410     //  support for GL_ALPHA and ALPHA8
 411
 412     // GL_EXT_bgra adds BGRA render targets to any version
 413
 414     // ES 2.0
 415     //  color renderable: RGBA4, RGB5_A1, RGB565
 416     //  GL_EXT_texture_rg adds support for R8 as a color render target
 417     //  GL_OES_rgb8_rgba8 and/or GL_ARM_rgba8 adds support for RGBA8
 418     //  GL_EXT_texture_format_BGRA8888 and/or GL_APPLE_texture_format_BGRA8888 added BGRA support
 419
 420     // ES 3.0
 421     // Same as ES 2.0 except R8 and RGBA8 are supported without extensions (the functions called
 422     // below already account for this).
 423
 424     GrGLStandard standard = ctxInfo.standard();
 425
 426     enum {
 427         kNo_MSAA = 0,
 428         kYes_MSAA = 1,
 429     };
 430
 431     if (kGL_GrGLStandard == standard) {
 432         // Post 3.0 we will get R8
 433         // Prior to 3.0 we will get ALPHA8 (with GL_ARB_framebuffer_object)
 434         if (ctxInfo.version() >= GR_GL_VER(3,0) ||
 435             ctxInfo.hasExtension("GL_ARB_framebuffer_object")) {
 436             fConfigRenderSupport[kAlpha_8_GrPixelConfig][kNo_MSAA] = true;
 437             fConfigRenderSupport[kAlpha_8_GrPixelConfig][kYes_MSAA] = true;
 438         }
 439     } else {
 440         // On ES we can only hope for R8
 441         fConfigRenderSupport[kAlpha_8_GrPixelConfig][kNo_MSAA] = fTextureRedSupport;
 442         fConfigRenderSupport[kAlpha_8_GrPixelConfig][kYes_MSAA] = fTextureRedSupport;
 443     }
 444
 445     if (kGL_GrGLStandard != standard) {
 446         // only available in ES
 447         fConfigRenderSupport[kRGB_565_GrPixelConfig][kNo_MSAA] = true;
 448         fConfigRenderSupport[kRGB_565_GrPixelConfig][kYes_MSAA] = true;
 449     }
 450
 451     // we no longer support 444 as a render target
 452     fConfigRenderSupport[kRGBA_4444_GrPixelConfig][kNo_MSAA]  = false;
 453     fConfigRenderSupport[kRGBA_4444_GrPixelConfig][kYes_MSAA]  = false;
 454
 455     if (this->fRGBA8RenderbufferSupport) {
 456         fConfigRenderSupport[kRGBA_8888_GrPixelConfig][kNo_MSAA]  = true;
 457         fConfigRenderSupport[kRGBA_8888_GrPixelConfig][kYes_MSAA]  = true;
 458     }
 459
 460     if (this->isConfigTexturable(kBGRA_8888_GrPixelConfig)) {
 461         fConfigRenderSupport[kBGRA_8888_GrPixelConfig][kNo_MSAA]  = true;
 462         // The GL_EXT_texture_format_BGRA8888 extension does not add BGRA to the list of
 463         // configs that are color-renderable and can be passed to glRenderBufferStorageMultisample.
 464         // Chromium may have an extension to allow BGRA renderbuffers to work on desktop platforms.
 465         if (ctxInfo.hasExtension("GL_CHROMIUM_renderbuffer_format_BGRA8888")) {
 466             fConfigRenderSupport[kBGRA_8888_GrPixelConfig][kYes_MSAA] = true;
 467         } else {
 468             fConfigRenderSupport[kBGRA_8888_GrPixelConfig][kYes_MSAA] =
 469                 !fBGRAIsInternalFormat || !this->usesMSAARenderBuffers();
 470         }
 471     }
 472
 473     if (this->isConfigTexturable(kRGBA_float_GrPixelConfig)) {
 474         fConfigRenderSupport[kRGBA_float_GrPixelConfig][kNo_MSAA] = true;
 475     }
 476
 477     // If we don't support MSAA then undo any places above where we set a config as renderable with
 478     // msaa.
 479     if (kNone_MSFBOType == fMSFBOType) {
 480         for (int i = 0; i < kGrPixelConfigCnt; ++i) {
 481             fConfigRenderSupport[i][kYes_MSAA] = false;
 482         }
 483     }
 484 }
 485
 486 void GrGLCaps::initConfigTexturableTable(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
 487     GrGLStandard standard = ctxInfo.standard();
 488     GrGLVersion version = ctxInfo.version();
 489
 490     // Base texture support
 491     fConfigTextureSupport[kAlpha_8_GrPixelConfig] = true;
 492     fConfigTextureSupport[kRGB_565_GrPixelConfig] = true;
 493     fConfigTextureSupport[kRGBA_4444_GrPixelConfig] = true;
 494     fConfigTextureSupport[kRGBA_8888_GrPixelConfig] = true;
 495
 496     // Check for 8-bit palette..
 497     GrGLint numFormats;
 498     GR_GL_GetIntegerv(gli, GR_GL_NUM_COMPRESSED_TEXTURE_FORMATS, &numFormats);
 499     if (numFormats) {
 500         SkAutoSTMalloc<10, GrGLint> formats(numFormats);
 501         GR_GL_GetIntegerv(gli, GR_GL_COMPRESSED_TEXTURE_FORMATS, formats);
 502         for (int i = 0; i < numFormats; ++i) {
 503             if (GR_GL_PALETTE8_RGBA8 == formats[i]) {
 504                 fConfigTextureSupport[kIndex_8_GrPixelConfig] = true;
 505                 break;
 506             }
 507         }
 508     }
 509
 510     // Check for BGRA
 511     if (kGL_GrGLStandard == standard) {
 512         fConfigTextureSupport[kBGRA_8888_GrPixelConfig] =
 513             version >= GR_GL_VER(1,2) || ctxInfo.hasExtension("GL_EXT_bgra");
 514     } else {
 515         if (ctxInfo.hasExtension("GL_APPLE_texture_format_BGRA8888")) {
 516             fConfigTextureSupport[kBGRA_8888_GrPixelConfig] = true;
 517         } else if (ctxInfo.hasExtension("GL_EXT_texture_format_BGRA8888")) {
 518             fConfigTextureSupport[kBGRA_8888_GrPixelConfig] = true;
 519             fBGRAIsInternalFormat = true;
 520         }
 521         SkASSERT(fConfigTextureSupport[kBGRA_8888_GrPixelConfig] ||
 522                  kSkia8888_GrPixelConfig != kBGRA_8888_GrPixelConfig);
 523     }
 524
 525     // Compressed texture support
 526
 527     // glCompressedTexImage2D is available on all OpenGL ES devices...
 528     // however, it is only available on standard OpenGL after version 1.3
 529     bool hasCompressTex2D = (kGL_GrGLStandard != standard || version >= GR_GL_VER(1, 3));
 530
 531     fCompressedTexSubImageSupport =
 532         hasCompressTex2D && (gli->fFunctions.fCompressedTexSubImage2D);
 533
 534     // Check for ETC1
 535     bool hasETC1 = false;
 536
 537     // First check version for support
 538     if (kGL_GrGLStandard == standard) {
 539         hasETC1 = hasCompressTex2D &&
 540             (version >= GR_GL_VER(4, 3) ||
 541              ctxInfo.hasExtension("GL_ARB_ES3_compatibility"));
 542     } else {
 543         hasETC1 = hasCompressTex2D &&
 544             (version >= GR_GL_VER(3, 0) ||
 545              ctxInfo.hasExtension("GL_OES_compressed_ETC1_RGB8_texture") ||
 546              // ETC2 is a superset of ETC1, so we can just check for that, too.
 547              (ctxInfo.hasExtension("GL_OES_compressed_ETC2_RGB8_texture") &&
 548               ctxInfo.hasExtension("GL_OES_compressed_ETC2_RGBA8_texture")));
 549     }
 550     fConfigTextureSupport[kETC1_GrPixelConfig] = hasETC1;
 551
 552     // Check for LATC under its various forms
 553     LATCAlias alias = kLATC_LATCAlias;
 554     bool hasLATC = hasCompressTex2D &&
 555         (ctxInfo.hasExtension("GL_EXT_texture_compression_latc") ||
 556          ctxInfo.hasExtension("GL_NV_texture_compression_latc"));
 557
 558     // Check for RGTC
 559     if (!hasLATC) {
 560         // If we're using OpenGL 3.0 or later, then we have RGTC, an identical compression format.
 561         if (kGL_GrGLStandard == standard) {
 562             hasLATC = version >= GR_GL_VER(3, 0);
 563         }
 564
 565         if (!hasLATC) {
 566             hasLATC =
 567                 ctxInfo.hasExtension("GL_EXT_texture_compression_rgtc") ||
 568                 ctxInfo.hasExtension("GL_ARB_texture_compression_rgtc");
 569         }
 570
 571         if (hasLATC) {
 572             alias = kRGTC_LATCAlias;
 573         }
 574     }
 575
 576     // Check for 3DC
 577     if (!hasLATC) {
 578         hasLATC = ctxInfo.hasExtension("GL_AMD_compressed_3DC_texture");
 579         if (hasLATC) {
 580             alias = k3DC_LATCAlias;
 581         }
 582     }
 583
 584     fConfigTextureSupport[kLATC_GrPixelConfig] = hasLATC;
 585     fLATCAlias = alias;
 586
 587     // Check for R11_EAC ... We don't support R11_EAC on desktop, as most
 588     // cards default to decompressing the textures in the driver, and is
 589     // generally slower.
 590     if (kGL_GrGLStandard != standard) {
 591         fConfigTextureSupport[kR11_EAC_GrPixelConfig] = version >= GR_GL_VER(3, 0);
 592     }
 593
 594     // Check for ASTC
 595     fConfigTextureSupport[kASTC_12x12_GrPixelConfig] =
 596         ctxInfo.hasExtension("GL_KHR_texture_compression_astc_hdr") ||
 597         ctxInfo.hasExtension("GL_KHR_texture_compression_astc_ldr") ||
 598         ctxInfo.hasExtension("GL_OES_texture_compression_astc");
 599
 600     // Check for floating point texture support
 601     // NOTE: We disallow floating point textures on ES devices if linear
 602     // filtering modes are not supported.  This is for simplicity, but a more
 603     // granular approach is possible.  Coincidentally, floating point textures became part of
 604     // the standard in ES3.1 / OGL 3.1, hence the shorthand
 605     bool hasFPTextures = version >= GR_GL_VER(3, 1);
 606     if (!hasFPTextures) {
 607         hasFPTextures = ctxInfo.hasExtension("GL_ARB_texture_float") ||
 608                         (ctxInfo.hasExtension("OES_texture_float_linear") &&
 609                          ctxInfo.hasExtension("GL_OES_texture_float"));
 610     }
 611     fConfigTextureSupport[kRGBA_float_GrPixelConfig] = hasFPTextures;
 612 }
 613
 614 bool GrGLCaps::doReadPixelsSupported(const GrGLInterface* intf,
 615                                      GrGLenum format,
 616                                      GrGLenum type) const {
 617     if (GR_GL_RGBA == format && GR_GL_UNSIGNED_BYTE == type) {
 618         // ES 2 guarantees this format is supported
 619         return true;
 620     }
 621
 622     if (!fTwoFormatLimit) {
 623         // not limited by ES 2's constraints
 624         return true;
 625     }
 626
 627     GrGLint otherFormat = GR_GL_RGBA;
 628     GrGLint otherType = GR_GL_UNSIGNED_BYTE;
 629
 630     // The other supported format/type combo supported for ReadPixels
 631     // can change based on which render target is bound
 632     GR_GL_GetIntegerv(intf,
 633                       GR_GL_IMPLEMENTATION_COLOR_READ_FORMAT,
 634                       &otherFormat);
 635
 636     GR_GL_GetIntegerv(intf,
 637                       GR_GL_IMPLEMENTATION_COLOR_READ_TYPE,
 638                       &otherType);
 639
 640     return (GrGLenum)otherFormat == format && (GrGLenum)otherType == type;
 641 }
 642
 643 bool GrGLCaps::readPixelsSupported(const GrGLInterface* intf,
 644                                    GrGLenum format,
 645                                    GrGLenum type,
 646                                    GrGLenum currFboFormat) const {
 647
 648     ReadPixelsSupportedFormats::Key key = {format, type, currFboFormat};
 649
 650     ReadPixelsSupportedFormats* cachedValue = fReadPixelsSupportedCache.find(key);
 651
 652     if (NULL == cachedValue) {
 653         bool value = doReadPixelsSupported(intf, format, type);
 654         ReadPixelsSupportedFormats newValue(key, value);
 655         fReadPixelsSupportedCache.add(newValue);
 656
 657         return newValue.value();
 658     }
 659
 660     return cachedValue->value();
 661 }
 662
 663 void GrGLCaps::initFSAASupport(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
 664
 665     fMSFBOType = kNone_MSFBOType;
 666     if (kGL_GrGLStandard != ctxInfo.standard()) {
 667         // We prefer the EXT/IMG extension over ES3 MSAA because we've observed
 668         // ES3 driver bugs on at least one device with a tiled GPU (N10).
 669         if (ctxInfo.hasExtension("GL_EXT_multisampled_render_to_texture")) {
 670             fMSFBOType = kES_EXT_MsToTexture_MSFBOType;
 671         } else if (ctxInfo.hasExtension("GL_IMG_multisampled_render_to_texture")) {
 672             fMSFBOType = kES_IMG_MsToTexture_MSFBOType;
 673         } else if (ctxInfo.version() >= GR_GL_VER(3,0)) {
 674             fMSFBOType = GrGLCaps::kES_3_0_MSFBOType;
 675         } else if (ctxInfo.hasExtension("GL_CHROMIUM_framebuffer_multisample")) {
 676             // chrome's extension is equivalent to the EXT msaa
 677             // and fbo_blit extensions.
 678             fMSFBOType = kDesktop_EXT_MSFBOType;
 679         } else if (ctxInfo.hasExtension("GL_APPLE_framebuffer_multisample")) {
 680             fMSFBOType = kES_Apple_MSFBOType;
 681         }
 682     } else {
 683         if ((ctxInfo.version() >= GR_GL_VER(3,0)) ||
 684             ctxInfo.hasExtension("GL_ARB_framebuffer_object")) {
 685             fMSFBOType = GrGLCaps::kDesktop_ARB_MSFBOType;
 686         } else if (ctxInfo.hasExtension("GL_EXT_framebuffer_multisample") &&
 687                    ctxInfo.hasExtension("GL_EXT_framebuffer_blit")) {
 688             fMSFBOType = GrGLCaps::kDesktop_EXT_MSFBOType;
 689         }
 690     }
 691 }
 692
 693 namespace {
 694 const GrGLuint kUnknownBitCount = GrGLStencilBuffer::kUnknownBitCount;
 695 }
 696
 697 void GrGLCaps::initStencilFormats(const GrGLContextInfo& ctxInfo) {
 698
 699     // Build up list of legal stencil formats (though perhaps not supported on
 700     // the particular gpu/driver) from most preferred to least.
 701
 702     // these consts are in order of most preferred to least preferred
 703     // we don't bother with GL_STENCIL_INDEX1 or GL_DEPTH32F_STENCIL8
 704
 705     static const StencilFormat
 706                   // internal Format      stencil bits      total bits        packed?
 707         gS8    = {GR_GL_STENCIL_INDEX8,   8,                8,                false},
 708         gS16   = {GR_GL_STENCIL_INDEX16,  16,               16,               false},
 709         gD24S8 = {GR_GL_DEPTH24_STENCIL8, 8,                32,               true },
 710         gS4    = {GR_GL_STENCIL_INDEX4,   4,                4,                false},
 711     //  gS     = {GR_GL_STENCIL_INDEX,    kUnknownBitCount, kUnknownBitCount, false},
 712         gDS    = {GR_GL_DEPTH_STENCIL,    kUnknownBitCount, kUnknownBitCount, true };
 713
 714     if (kGL_GrGLStandard == ctxInfo.standard()) {
 715         bool supportsPackedDS =
 716             ctxInfo.version() >= GR_GL_VER(3,0) ||
 717             ctxInfo.hasExtension("GL_EXT_packed_depth_stencil") ||
 718             ctxInfo.hasExtension("GL_ARB_framebuffer_object");
 719
 720         // S1 thru S16 formats are in GL 3.0+, EXT_FBO, and ARB_FBO since we
 721         // require FBO support we can expect these are legal formats and don't
 722         // check. These also all support the unsized GL_STENCIL_INDEX.
 723         fStencilFormats.push_back() = gS8;
 724         fStencilFormats.push_back() = gS16;
 725         if (supportsPackedDS) {
 726             fStencilFormats.push_back() = gD24S8;
 727         }
 728         fStencilFormats.push_back() = gS4;
 729         if (supportsPackedDS) {
 730             fStencilFormats.push_back() = gDS;
 731         }
 732     } else {
 733         // ES2 has STENCIL_INDEX8 without extensions but requires extensions
 734         // for other formats.
 735         // ES doesn't support using the unsized format.
 736
 737         fStencilFormats.push_back() = gS8;
 738         //fStencilFormats.push_back() = gS16;
 739         if (ctxInfo.version() >= GR_GL_VER(3,0) ||
 740             ctxInfo.hasExtension("GL_OES_packed_depth_stencil")) {
 741             fStencilFormats.push_back() = gD24S8;
 742         }
 743         if (ctxInfo.hasExtension("GL_OES_stencil4")) {
 744             fStencilFormats.push_back() = gS4;
 745         }
 746     }
 747     SkASSERT(0 == fStencilVerifiedColorConfigs.count());
 748     fStencilVerifiedColorConfigs.push_back_n(fStencilFormats.count());
 749 }
 750
 751 void GrGLCaps::markColorConfigAndStencilFormatAsVerified(
 752                                     GrPixelConfig config,
 753                                     const GrGLStencilBuffer::Format& format) {
 754 #if !GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT
 755     return;
 756 #endif
 757     SkASSERT((unsigned)config < (unsigned)kGrPixelConfigCnt);
 758     SkASSERT(fStencilFormats.count() == fStencilVerifiedColorConfigs.count());
 759     int count = fStencilFormats.count();
 760     // we expect a really small number of possible formats so linear search
 761     // should be OK
 762     SkASSERT(count < 16);
 763     for (int i = 0; i < count; ++i) {
 764         if (format.fInternalFormat ==
 765             fStencilFormats[i].fInternalFormat) {
 766             fStencilVerifiedColorConfigs[i].markVerified(config);
 767             return;
 768         }
 769     }
 770     SkFAIL("Why are we seeing a stencil format that "
 771             "GrGLCaps doesn't know about.");
 772 }
 773
 774 bool GrGLCaps::isColorConfigAndStencilFormatVerified(
 775                                 GrPixelConfig config,
 776                                 const GrGLStencilBuffer::Format& format) const {
 777 #if !GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT
 778     return false;
 779 #endif
 780     SkASSERT((unsigned)config < (unsigned)kGrPixelConfigCnt);
 781     int count = fStencilFormats.count();
 782     // we expect a really small number of possible formats so linear search
 783     // should be OK
 784     SkASSERT(count < 16);
 785     for (int i = 0; i < count; ++i) {
 786         if (format.fInternalFormat ==
 787             fStencilFormats[i].fInternalFormat) {
 788             return fStencilVerifiedColorConfigs[i].isVerified(config);
 789         }
 790     }
 791     SkFAIL("Why are we seeing a stencil format that "
 792             "GLCaps doesn't know about.");
 793     return false;
 794 }
 795
 796 SkString GrGLCaps::dump() const {
 797
 798     SkString r = INHERITED::dump();
 799
 800     r.appendf("--- GL-Specific ---\n");
 801     for (int i = 0; i < fStencilFormats.count(); ++i) {
 802         r.appendf("Stencil Format %d, stencil bits: %02d, total bits: %02d\n",
 803                  i,
 804                  fStencilFormats[i].fStencilBits,
 805                  fStencilFormats[i].fTotalBits);
 806     }
 807
 808     static const char* kMSFBOExtStr[] = {
 809         "None",
 810         "ARB",
 811         "EXT",
 812         "ES 3.0",
 813         "Apple",
 814         "IMG MS To Texture",
 815         "EXT MS To Texture",
 816     };
 817     GR_STATIC_ASSERT(0 == kNone_MSFBOType);
 818     GR_STATIC_ASSERT(1 == kDesktop_ARB_MSFBOType);
 819     GR_STATIC_ASSERT(2 == kDesktop_EXT_MSFBOType);
 820     GR_STATIC_ASSERT(3 == kES_3_0_MSFBOType);
 821     GR_STATIC_ASSERT(4 == kES_Apple_MSFBOType);
 822     GR_STATIC_ASSERT(5 == kES_IMG_MsToTexture_MSFBOType);
 823     GR_STATIC_ASSERT(6 == kES_EXT_MsToTexture_MSFBOType);
 824     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kMSFBOExtStr) == kLast_MSFBOType + 1);
 825
 826     static const char* kInvalidateFBTypeStr[] = {
 827         "None",
 828         "Discard",
 829         "Invalidate",
 830     };
 831     GR_STATIC_ASSERT(0 == kNone_InvalidateFBType);
 832     GR_STATIC_ASSERT(1 == kDiscard_InvalidateFBType);
 833     GR_STATIC_ASSERT(2 == kInvalidate_InvalidateFBType);
 834     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kInvalidateFBTypeStr) == kLast_InvalidateFBType + 1);
 835
 836     static const char* kMapBufferTypeStr[] = {
 837         "None",
 838         "MapBuffer",
 839         "MapBufferRange",
 840         "Chromium",
 841     };
 842     GR_STATIC_ASSERT(0 == kNone_MapBufferType);
 843     GR_STATIC_ASSERT(1 == kMapBuffer_MapBufferType);
 844     GR_STATIC_ASSERT(2 == kMapBufferRange_MapBufferType);
 845     GR_STATIC_ASSERT(3 == kChromium_MapBufferType);
 846     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kMapBufferTypeStr) == kLast_MapBufferType + 1);
 847
 848     r.appendf("Core Profile: %s\n", (fIsCoreProfile ? "YES" : "NO"));
 849     r.appendf("MSAA Type: %s\n", kMSFBOExtStr[fMSFBOType]);
 850     r.appendf("FB Fetch Support: %s\n", (fFBFetchSupport ? "YES" : "NO"));
 851     r.appendf("Invalidate FB Type: %s\n", kInvalidateFBTypeStr[fInvalidateFBType]);
 852     r.appendf("Map Buffer Type: %s\n", kMapBufferTypeStr[fMapBufferType]);
 853     r.appendf("Max FS Uniform Vectors: %d\n", fMaxFragmentUniformVectors);
 854     r.appendf("Max FS Texture Units: %d\n", fMaxFragmentTextureUnits);
 855     if (!fIsCoreProfile) {
 856         r.appendf("Max Fixed Function Texture Coords: %d\n", fMaxFixedFunctionTextureCoords);
 857     }
 858     r.appendf("Max Vertex Attributes: %d\n", fMaxVertexAttributes);
 859     r.appendf("Support RGBA8 Render Buffer: %s\n", (fRGBA8RenderbufferSupport ? "YES": "NO"));
 860     r.appendf("BGRA is an internal format: %s\n", (fBGRAIsInternalFormat ? "YES": "NO"));
 861     r.appendf("Support texture swizzle: %s\n", (fTextureSwizzleSupport ? "YES": "NO"));
 862     r.appendf("Unpack Row length support: %s\n", (fUnpackRowLengthSupport ? "YES": "NO"));
 863     r.appendf("Unpack Flip Y support: %s\n", (fUnpackFlipYSupport ? "YES": "NO"));
 864     r.appendf("Pack Row length support: %s\n", (fPackRowLengthSupport ? "YES": "NO"));
 865     r.appendf("Pack Flip Y support: %s\n", (fPackFlipYSupport ? "YES": "NO"));
 866
 867     r.appendf("Texture Usage support: %s\n", (fTextureUsageSupport ? "YES": "NO"));
 868     r.appendf("Texture Storage support: %s\n", (fTexStorageSupport ? "YES": "NO"));
 869     r.appendf("GL_R support: %s\n", (fTextureRedSupport ? "YES": "NO"));
 870     r.appendf("GL_ARB_imaging support: %s\n", (fImagingSupport ? "YES": "NO"));
 871     r.appendf("Two Format Limit: %s\n", (fTwoFormatLimit ? "YES": "NO"));
 872     r.appendf("Fragment coord conventions support: %s\n",
 873              (fFragCoordsConventionSupport ? "YES": "NO"));
 874     r.appendf("Vertex array object support: %s\n", (fVertexArrayObjectSupport ? "YES": "NO"));
 875     r.appendf("Use non-VBO for dynamic data: %s\n",
 876              (fUseNonVBOVertexAndIndexDynamicData ? "YES" : "NO"));
 877     r.appendf("Full screen clear is free: %s\n", (fFullClearIsFree ? "YES" : "NO"));
 878     r.appendf("Drops tile on zero divide: %s\n", (fDropsTileOnZeroDivide ? "YES" : "NO"));
 879     return r;
 880 }