static const char* sample_offset_array_name(GrGLSLFPFragmentBuilder::Coordinates coords) {
    static const char* kArrayNames[] = {
        "deviceSpaceSampleOffsets",
        "windowSpaceSampleOffsets"
    };
    return kArrayNames[coords];

    GR_STATIC_ASSERT(0 == GrGLSLFPFragmentBuilder::kSkiaDevice_Coordinates);
    GR_STATIC_ASSERT(1 == GrGLSLFPFragmentBuilder::kGLSLWindow_Coordinates);
    GR_STATIC_ASSERT(SK_ARRAY_COUNT(kArrayNames) == GrGLSLFPFragmentBuilder::kLast_Coordinates + 1);
}

static inline VkSamplerAddressMode tile_to_vk_sampler_address(SkShader::TileMode tm) {
    static const VkSamplerAddressMode gWrapModes[] = {
        VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE,
        VK_SAMPLER_ADDRESS_MODE_REPEAT,
        VK_SAMPLER_ADDRESS_MODE_MIRRORED_REPEAT
    };
    GR_STATIC_ASSERT(SkShader::kTileModeCount == SK_ARRAY_COUNT(gWrapModes));
    GR_STATIC_ASSERT(0 == SkShader::kClamp_TileMode);
    GR_STATIC_ASSERT(1 == SkShader::kRepeat_TileMode);
    GR_STATIC_ASSERT(2 == SkShader::kMirror_TileMode);
    return gWrapModes[tm];
}

GrPathRenderer* GrPathRendererChain::getPathRenderer(const GrDrawTarget* target,
        const GrPipelineBuilder* pipelineBuilder,
        const SkMatrix& viewMatrix,
        const SkPath& path,
        const GrStrokeInfo& stroke,
        DrawType drawType,
        StencilSupport* stencilSupport) {
    if (!fInit) {
        this->init();
    }
    bool antiAlias = (kColorAntiAlias_DrawType == drawType ||
                      kStencilAndColorAntiAlias_DrawType == drawType);

    GR_STATIC_ASSERT(GrPathRenderer::kNoSupport_StencilSupport <
                     GrPathRenderer::kStencilOnly_StencilSupport);
    GR_STATIC_ASSERT(GrPathRenderer::kStencilOnly_StencilSupport <
                     GrPathRenderer::kNoRestriction_StencilSupport);
    GrPathRenderer::StencilSupport minStencilSupport;
    if (kStencilOnly_DrawType == drawType) {
        minStencilSupport = GrPathRenderer::kStencilOnly_StencilSupport;
    } else if (kStencilAndColor_DrawType == drawType ||
               kStencilAndColorAntiAlias_DrawType == drawType) {
        minStencilSupport = GrPathRenderer::kNoRestriction_StencilSupport;
    } else {
        minStencilSupport = GrPathRenderer::kNoSupport_StencilSupport;
    }


    for (int i = 0; i < fChain.count(); ++i) {
        GrPathRenderer::CanDrawPathArgs args;
        args.fShaderCaps = target->caps()->shaderCaps();
        args.fPipelineBuilder = pipelineBuilder;
        args.fViewMatrix = &viewMatrix;
        args.fPath = &path;
        args.fStroke = &stroke;
        args.fAntiAlias = antiAlias;
        if (fChain[i]->canDrawPath(args)) {
            if (GrPathRenderer::kNoSupport_StencilSupport != minStencilSupport) {
                GrPathRenderer::StencilSupport support =
                    fChain[i]->getStencilSupport(path, stroke);
                if (support < minStencilSupport) {
                    continue;
                } else if (stencilSupport) {
                    *stencilSupport = support;
                }
            }
            return fChain[i];
        }
    }
    return NULL;
}

VkCullModeFlags draw_face_to_vk_cull_mode(GrPipelineBuilder::DrawFace drawFace) {
    // Assumes that we've set the front face to be ccw
    static const VkCullModeFlags gTable[] = {
        VK_CULL_MODE_NONE,              // kBoth_DrawFace
        VK_CULL_MODE_BACK_BIT,          // kCCW_DrawFace, cull back face
        VK_CULL_MODE_FRONT_BIT,         // kCW_DrawFace, cull front face
    };
    GR_STATIC_ASSERT(0 == GrPipelineBuilder::kBoth_DrawFace);
    GR_STATIC_ASSERT(1 == GrPipelineBuilder::kCCW_DrawFace);
    GR_STATIC_ASSERT(2 == GrPipelineBuilder::kCW_DrawFace);
    SkASSERT((unsigned)drawFace <= 2);

    return gTable[drawFace];
}

// If the path is small enough to be keyed from its data this returns key length, otherwise -1.
static int path_key_from_data_size(const SkPath& path) {
    const int verbCnt = path.countVerbs();
    if (verbCnt > GrShape::kMaxKeyFromDataVerbCnt) {
        return -1;
    }
    const int pointCnt = path.countPoints();
    const int conicWeightCnt = SkPathPriv::ConicWeightCnt(path);

    GR_STATIC_ASSERT(sizeof(SkPoint) == 2 * sizeof(uint32_t));
    GR_STATIC_ASSERT(sizeof(SkScalar) == sizeof(uint32_t));
    // 2 is for the verb cnt and a fill type. Each verb is a byte but we'll pad the verb data out to
    // a uint32_t length.
    return 2 + (SkAlign4(verbCnt) >> 2) + 2 * pointCnt + conicWeightCnt;
}

static VkBlendOp blend_equation_to_vk_blend_op(GrBlendEquation equation) {
    static const VkBlendOp gTable[] = {
        VK_BLEND_OP_ADD,               // kAdd_GrBlendEquation
        VK_BLEND_OP_SUBTRACT,          // kSubtract_GrBlendEquation
        VK_BLEND_OP_REVERSE_SUBTRACT,  // kReverseSubtract_GrBlendEquation
    };
    GR_STATIC_ASSERT(SK_ARRAY_COUNT(gTable) == kFirstAdvancedGrBlendEquation);
    GR_STATIC_ASSERT(0 == kAdd_GrBlendEquation);
    GR_STATIC_ASSERT(1 == kSubtract_GrBlendEquation);
    GR_STATIC_ASSERT(2 == kReverseSubtract_GrBlendEquation);

    SkASSERT((unsigned)equation < kGrBlendCoeffCnt);
    return gTable[equation];
}

void GrGLCaps::print() const {

    INHERITED::print();

    GrPrintf("--- GL-Specific ---\n");
    for (int i = 0; i < fStencilFormats.count(); ++i) {
        GrPrintf("Stencil Format %d, stencil bits: %02d, total bits: %02d\n",
                 i,
                 fStencilFormats[i].fStencilBits,
                 fStencilFormats[i].fTotalBits);
    }

    GR_STATIC_ASSERT(0 == kNone_MSFBOType);
    GR_STATIC_ASSERT(1 == kDesktopARB_MSFBOType);
    GR_STATIC_ASSERT(2 == kDesktopEXT_MSFBOType);
    GR_STATIC_ASSERT(3 == kAppleES_MSFBOType);
    GR_STATIC_ASSERT(4 == kImaginationES_MSFBOType);
    static const char* gMSFBOExtStr[] = {
        "None",
        "ARB",
        "EXT",
        "Apple",
        "IMG",
    };
    GrPrintf("MSAA Type: %s\n", gMSFBOExtStr[fMSFBOType]);
    GrPrintf("Max FS Uniform Vectors: %d\n", fMaxFragmentUniformVectors);
    GrPrintf("Max Vertex Attributes: %d\n", fMaxVertexAttributes);
    GrPrintf("Support RGBA8 Render Buffer: %s\n", (fRGBA8RenderbufferSupport ? "YES": "NO"));
    GrPrintf("BGRA support: %s\n", (fBGRAFormatSupport ? "YES": "NO"));
    GrPrintf("BGRA is an internal format: %s\n", (fBGRAIsInternalFormat ? "YES": "NO"));
    GrPrintf("Support texture swizzle: %s\n", (fTextureSwizzleSupport ? "YES": "NO"));
    GrPrintf("Unpack Row length support: %s\n", (fUnpackRowLengthSupport ? "YES": "NO"));
    GrPrintf("Unpack Flip Y support: %s\n", (fUnpackFlipYSupport ? "YES": "NO"));
    GrPrintf("Pack Row length support: %s\n", (fPackRowLengthSupport ? "YES": "NO"));
    GrPrintf("Pack Flip Y support: %s\n", (fPackFlipYSupport ? "YES": "NO"));

    GrPrintf("Texture Usage support: %s\n", (fTextureUsageSupport ? "YES": "NO"));
    GrPrintf("Texture Storage support: %s\n", (fTexStorageSupport ? "YES": "NO"));
    GrPrintf("GL_R support: %s\n", (fTextureRedSupport ? "YES": "NO"));
    GrPrintf("GL_ARB_imaging support: %s\n", (fImagingSupport ? "YES": "NO"));
    GrPrintf("Two Format Limit: %s\n", (fTwoFormatLimit ? "YES": "NO"));
    GrPrintf("Fragment coord conventions support: %s\n",
             (fFragCoordsConventionSupport ? "YES": "NO"));
    GrPrintf("Vertex array object support: %s\n", (fVertexArrayObjectSupport ? "YES": "NO"));
    GrPrintf("Use non-VBO for dynamic data: %s\n",
             (fUseNonVBOVertexAndIndexDynamicData ? "YES" : "NO"));
    GrPrintf("Core Profile: %s\n", (fIsCoreProfile ? "YES" : "NO"));
    GrPrintf("Discard FrameBuffer support: %s\n", (fDiscardFBSupport ? "YES" : "NO"));
}

static uint32_t setup_quad_index_buffer(const GrGLInterface* gl) {
    static const int kMaxQuads = 1;//1 << 12; // max possible: (1 << 14) - 1;
    GR_STATIC_ASSERT(4 * kMaxQuads <= 65535);
    static const uint16_t kPattern[] = { 0, 1, 2, 0, 2, 3 };
    static const int kPatternSize = 6;
    static const int kVertCount = 4;
    static const int kIndicesCount = kPatternSize * kMaxQuads;
    int size = kPatternSize * kMaxQuads * sizeof(uint16_t);

    uint16_t* data = SkNEW_ARRAY(uint16_t, kMaxQuads * kPatternSize);

    for (int i = 0; i < kMaxQuads; ++i) {
        int baseIdx = i * kPatternSize;
        uint16_t baseVert = (uint16_t)(i * kVertCount);
        for (int j = 0; j < kPatternSize; ++j) {
            data[baseIdx+j] = baseVert + kPattern[j];
        }
    }

    GrGLuint quadIBO;
    GR_GL_CALL(gl, GenBuffers(1, &quadIBO));
    GR_GL_CALL(gl, BindBuffer(GR_GL_ELEMENT_ARRAY_BUFFER, quadIBO));
    GR_GL_CALL(gl, BufferData(GR_GL_ELEMENT_ARRAY_BUFFER, size, data, GR_GL_STATIC_DRAW));

    SkDELETE_ARRAY(data);
    return kIndicesCount;
}

static GrVkGpu::Heap buffer_type_to_heap(GrVkBuffer::Type type) {
    const GrVkGpu::Heap kBufferToHeap[] {
        GrVkGpu::kVertexBuffer_Heap,
        GrVkGpu::kIndexBuffer_Heap,
        GrVkGpu::kUniformBuffer_Heap,
        GrVkGpu::kCopyReadBuffer_Heap,
        GrVkGpu::kCopyWriteBuffer_Heap,
    };
    GR_STATIC_ASSERT(0 == GrVkBuffer::kVertex_Type);
    GR_STATIC_ASSERT(1 == GrVkBuffer::kIndex_Type);
    GR_STATIC_ASSERT(2 == GrVkBuffer::kUniform_Type);
    GR_STATIC_ASSERT(3 == GrVkBuffer::kCopyRead_Type);
    GR_STATIC_ASSERT(4 == GrVkBuffer::kCopyWrite_Type);

    return kBufferToHeap[type];
}

uint32_t get_blend_info_key(const GrPipeline& pipeline) {
    GrXferProcessor::BlendInfo blendInfo;
    pipeline.getXferProcessor().getBlendInfo(&blendInfo);

    static const uint32_t kBlendWriteShift = 1;
    static const uint32_t kBlendCoeffShift = 5;
    GR_STATIC_ASSERT(kLast_GrBlendCoeff < (1 << kBlendCoeffShift));
    GR_STATIC_ASSERT(kFirstAdvancedGrBlendEquation - 1 < 4);

    uint32_t key = blendInfo.fWriteColor;
    key |= (blendInfo.fSrcBlend << kBlendWriteShift);
    key |= (blendInfo.fDstBlend << (kBlendWriteShift + kBlendCoeffShift));
    key |= (blendInfo.fEquation << (kBlendWriteShift + 2 * kBlendCoeffShift));

    return key;
}

void GrGLConvexPolyEffect::GenKey(const GrProcessor& processor, const GrGLSLCaps&,
                                  GrProcessorKeyBuilder* b) {
    const GrConvexPolyEffect& cpe = processor.cast<GrConvexPolyEffect>();
    GR_STATIC_ASSERT(kGrProcessorEdgeTypeCnt <= 8);
    uint32_t key = (cpe.getEdgeCount() << 3) | cpe.getEdgeType();
    b->add32(key);
}

bool blend_coeff_refs_constant(GrBlendCoeff coeff) {
    static const bool gCoeffReferencesBlendConst[] = {
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        true,
        true,
        true,
        true,

        // extended blend coeffs
        false,
        false,
        false,
        false,
    };
    return gCoeffReferencesBlendConst[coeff];
    GR_STATIC_ASSERT(kGrBlendCoeffCnt == SK_ARRAY_COUNT(gCoeffReferencesBlendConst));
    // Individual enum asserts already made in blend_coeff_to_vk_blend
}

const GrIndexBuffer* GrResourceProvider::createQuadIndexBuffer() {
    static const int kMaxQuads = 1 << 12; // max possible: (1 << 14) - 1;
    GR_STATIC_ASSERT(4 * kMaxQuads <= 65535);
    static const uint16_t kPattern[] = { 0, 1, 2, 0, 2, 3 };

    return this->createInstancedIndexBuffer(kPattern, 6, kMaxQuads, 4, fQuadIndexBufferKey);
}

GrResourceKey GrTexture::ComputeScratchKey(const GrTextureDesc& desc) {
    GrCacheID::Key idKey;
    // Instead of a client-provided key of the texture contents we create a key from the
    // descriptor.
    GR_STATIC_ASSERT(sizeof(idKey) >= 16);
    GrAssert(desc.fHeight < (1 << 16));
    GrAssert(desc.fWidth < (1 << 16));
    idKey.fData32[0] = (desc.fWidth) | (desc.fHeight << 16);
    idKey.fData32[1] = desc.fConfig | desc.fSampleCnt << 16;
    idKey.fData32[2] = desc.fFlags;
    idKey.fData32[3] = resolve_origin(desc);    // Only needs 2 bits actually
    static const int kPadSize = sizeof(idKey) - 16;
    GR_STATIC_ASSERT(kPadSize >= 0);
    memset(idKey.fData8 + 16, 0, kPadSize);

    GrCacheID cacheID(GrResourceKey::ScratchDomain(), idKey);
    return GrResourceKey(cacheID, texture_resource_type(), 0);
}

void GrLayerCache::initAtlas() {
    SkASSERT(NULL == fAtlas.get());
    GR_STATIC_ASSERT(kNumPlotsX*kNumPlotsX == GrPictureInfo::kNumPlots);

    SkISize textureSize = SkISize::Make(kAtlasTextureWidth, kAtlasTextureHeight);
    fAtlas.reset(SkNEW_ARGS(GrAtlas, (fContext->getGpu(), kSkia8888_GrPixelConfig,
                                      kRenderTarget_GrSurfaceFlag,
                                      textureSize, kNumPlotsX, kNumPlotsY, false)));
}

GrPathRenderer* GrPathRendererChain::getPathRenderer(const GrDrawTarget* target,
                                                     const GrPipelineBuilder* pipelineBuilder,
                                                     const SkMatrix& viewMatrix,
                                                     const SkPath& path,
                                                     const SkStrokeRec& stroke,
                                                     DrawType drawType,
                                                     StencilSupport* stencilSupport) {
    if (!fInit) {
        this->init();
    }
    bool antiAlias = (kColorAntiAlias_DrawType == drawType ||
                      kStencilAndColorAntiAlias_DrawType == drawType);

    GR_STATIC_ASSERT(GrPathRenderer::kNoSupport_StencilSupport <
                     GrPathRenderer::kStencilOnly_StencilSupport);
    GR_STATIC_ASSERT(GrPathRenderer::kStencilOnly_StencilSupport <
                     GrPathRenderer::kNoRestriction_StencilSupport);
    GrPathRenderer::StencilSupport minStencilSupport;
    if (kStencilOnly_DrawType == drawType) {
        minStencilSupport = GrPathRenderer::kStencilOnly_StencilSupport;
    } else if (kStencilAndColor_DrawType == drawType ||
               kStencilAndColorAntiAlias_DrawType == drawType) {
        minStencilSupport = GrPathRenderer::kNoRestriction_StencilSupport;
    } else {
        minStencilSupport = GrPathRenderer::kNoSupport_StencilSupport;
    }


    for (int i = 0; i < fChain.count(); ++i) {
        if (fChain[i]->canDrawPath(target, pipelineBuilder, viewMatrix, path, stroke, antiAlias)) {
            if (GrPathRenderer::kNoSupport_StencilSupport != minStencilSupport) {
                GrPathRenderer::StencilSupport support =
                    fChain[i]->getStencilSupport(target, pipelineBuilder, path, stroke);
                if (support < minStencilSupport) {
                    continue;
                } else if (stencilSupport) {
                    *stencilSupport = support;
                }
            }
            return fChain[i];
        }
    }
    return NULL;
}

SkString GrDrawTargetCaps::dump() const {
    SkString r;
    static const char* gNY[] = {"NO", "YES"};
    r.appendf("8 Bit Palette Support        : %s\n", gNY[f8BitPaletteSupport]);
    r.appendf("MIP Map Support              : %s\n", gNY[fMipMapSupport]);
    r.appendf("NPOT Texture Tile Support    : %s\n", gNY[fNPOTTextureTileSupport]);
    r.appendf("Two Sided Stencil Support    : %s\n", gNY[fTwoSidedStencilSupport]);
    r.appendf("Stencil Wrap Ops  Support    : %s\n", gNY[fStencilWrapOpsSupport]);
    r.appendf("HW AA Lines Support          : %s\n", gNY[fHWAALineSupport]);
    r.appendf("Shader Derivative Support    : %s\n", gNY[fShaderDerivativeSupport]);
    r.appendf("Geometry Shader Support      : %s\n", gNY[fGeometryShaderSupport]);
    r.appendf("Dual Source Blending Support : %s\n", gNY[fDualSourceBlendingSupport]);
    r.appendf("Buffer Lock Support          : %s\n", gNY[fBufferLockSupport]);
    r.appendf("Path Rendering Support       : %s\n", gNY[fPathRenderingSupport]);
    r.appendf("Dst Read In Shader Support   : %s\n", gNY[fDstReadInShaderSupport]);
    r.appendf("Discard Render Target Support: %s\n", gNY[fDiscardRenderTargetSupport]);
    r.appendf("Reuse Scratch Textures       : %s\n", gNY[fReuseScratchTextures]);
    r.appendf("Gpu Tracing Support          : %s\n", gNY[fGpuTracingSupport]);
    r.appendf("Max Texture Size             : %d\n", fMaxTextureSize);
    r.appendf("Max Render Target Size       : %d\n", fMaxRenderTargetSize);
    r.appendf("Max Sample Count             : %d\n", fMaxSampleCount);

    static const char* kConfigNames[] = {
        "Unknown",  // kUnknown_GrPixelConfig
        "Alpha8",   // kAlpha_8_GrPixelConfig,
        "Index8",   // kIndex_8_GrPixelConfig,
        "RGB565",   // kRGB_565_GrPixelConfig,
        "RGBA444",  // kRGBA_4444_GrPixelConfig,
        "RGBA8888", // kRGBA_8888_GrPixelConfig,
        "BGRA8888", // kBGRA_8888_GrPixelConfig,
    };
    GR_STATIC_ASSERT(0 == kUnknown_GrPixelConfig);
    GR_STATIC_ASSERT(1 == kAlpha_8_GrPixelConfig);
    GR_STATIC_ASSERT(2 == kIndex_8_GrPixelConfig);
    GR_STATIC_ASSERT(3 == kRGB_565_GrPixelConfig);
    GR_STATIC_ASSERT(4 == kRGBA_4444_GrPixelConfig);
    GR_STATIC_ASSERT(5 == kRGBA_8888_GrPixelConfig);
    GR_STATIC_ASSERT(6 == kBGRA_8888_GrPixelConfig);
    GR_STATIC_ASSERT(SK_ARRAY_COUNT(kConfigNames) == kGrPixelConfigCnt);

    SkASSERT(!fConfigRenderSupport[kUnknown_GrPixelConfig][0]);
    SkASSERT(!fConfigRenderSupport[kUnknown_GrPixelConfig][1]);
    for (size_t i = 0; i < SK_ARRAY_COUNT(kConfigNames); ++i)  {
        if (i != kUnknown_GrPixelConfig) {
            r.appendf("%s is renderable: %s, with MSAA: %s\n",
                     kConfigNames[i],
                     gNY[fConfigRenderSupport[i][0]],
                     gNY[fConfigRenderSupport[i][1]]);
        }
    }
    return r;
}

void GrGLSLShaderBuilder::compileAndAppendLayoutQualifiers() {
    static const char* interfaceQualifierNames[] = {
        "out"
    };

    for (int interface = 0; interface <= kLastInterfaceQualifier; ++interface) {
        const SkTArray<SkString>& params = fLayoutParams[interface];
        if (params.empty()) {
            continue;
        }
        this->layoutQualifiers().appendf("layout(%s", params[0].c_str());
        for (int i = 1; i < params.count(); ++i) {
            this->layoutQualifiers().appendf(", %s", params[i].c_str());
        }
        this->layoutQualifiers().appendf(") %s;\n", interfaceQualifierNames[interface]);
    }

    GR_STATIC_ASSERT(0 == GrGLSLShaderBuilder::kOut_InterfaceQualifier);
    GR_STATIC_ASSERT(SK_ARRAY_COUNT(interfaceQualifierNames) == kLastInterfaceQualifier + 1);
}

GrPathRenderer* GrPathRendererChain::getPathRenderer(
        const GrPathRenderer::CanDrawPathArgs& args,
        DrawType drawType,
        GrPathRenderer::StencilSupport* stencilSupport) {
    GR_STATIC_ASSERT(GrPathRenderer::kNoSupport_StencilSupport <
                     GrPathRenderer::kStencilOnly_StencilSupport);
    GR_STATIC_ASSERT(GrPathRenderer::kStencilOnly_StencilSupport <
                     GrPathRenderer::kNoRestriction_StencilSupport);
    GrPathRenderer::StencilSupport minStencilSupport;
    if (kStencilOnly_DrawType == drawType) {
        minStencilSupport = GrPathRenderer::kStencilOnly_StencilSupport;
    } else if (kStencilAndColor_DrawType == drawType ||
               kStencilAndColorAntiAlias_DrawType == drawType) {
        minStencilSupport = GrPathRenderer::kNoRestriction_StencilSupport;
    } else {
        minStencilSupport = GrPathRenderer::kNoSupport_StencilSupport;
    }
    if (minStencilSupport != GrPathRenderer::kNoSupport_StencilSupport) {
        // We don't support (and shouldn't need) stenciling of non-fill paths.
        if (!args.fStyle->isSimpleFill()) {
            return nullptr;
        }
    }

    for (int i = 0; i < fChain.count(); ++i) {
        if (fChain[i]->canDrawPath(args)) {
            if (GrPathRenderer::kNoSupport_StencilSupport != minStencilSupport) {
                GrPathRenderer::StencilSupport support =
                                        fChain[i]->getStencilSupport(*args.fPath);
                if (support < minStencilSupport) {
                    continue;
                } else if (stencilSupport) {
                    *stencilSupport = support;
                }
            }
            return fChain[i];
        }
    }
    return nullptr;
}

SkMesaGLContext::SkMesaGLContext()
    : fContext(static_cast<Context>(NULL))
    , fImage(NULL) {
    GR_STATIC_ASSERT(sizeof(Context) == sizeof(OSMesaContext));

    /* Create an RGBA-mode context */
#if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
    /* specify Z, stencil, accum sizes */
    fContext = (Context)OSMesaCreateContextExt(OSMESA_BGRA, 0, 0, 0, NULL);
#else
    fContext = (Context)OSMesaCreateContext(OSMESA_BGRA, NULL);
#endif
    if (!fContext) {
        SkDebugf("OSMesaCreateContext failed!\n");
        this->destroyGLContext();
        return;
    }
    // Allocate the image buffer
    fImage = (GrGLubyte *) sk_malloc_throw(gBOGUS_SIZE * gBOGUS_SIZE *
                                           4 * sizeof(GrGLubyte));
    if (!fImage) {
        SkDebugf("Alloc image buffer failed!\n");
        this->destroyGLContext();
        return;
    }

    // Bind the buffer to the context and make it current
    if (!OSMesaMakeCurrent((OSMesaContext)fContext,
                           fImage,
                           GR_GL_UNSIGNED_BYTE,
                           gBOGUS_SIZE,
                           gBOGUS_SIZE)) {
        SkDebugf("OSMesaMakeCurrent failed!\n");
        this->destroyGLContext();
        return;
    }

    SkAutoTUnref<const GrGLInterface> gl(GrGLCreateMesaInterface());
    if (NULL == gl.get()) {
        SkDebugf("Could not create GL interface!\n");
        this->destroyGLContext();
        return;
    }

    if (!gl->validate()) {
        SkDebugf("Could not validate GL interface!\n");
        this->destroyGLContext();
        return;
    }

    this->init(gl.detach());
}