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      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 }
    851