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