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