C++ GrGLGpu类代码示例

bool GrGLProgramBuilder::compileAndAttachShaders(const char* glsl,
                                                 int length,
                                                 GrGLuint programId,
                                                 GrGLenum type,
                                                 SkTDArray<GrGLuint>* shaderIds,
                                                 const SkSL::Program::Settings& settings,
                                                 const SkSL::Program::Inputs& inputs) {
    GrGLGpu* gpu = this->gpu();
    GrGLuint shaderId = GrGLCompileAndAttachShader(gpu->glContext(),
                                                   programId,
                                                   type,
                                                   glsl,
                                                   length,
                                                   gpu->stats(),
                                                   settings);
    if (!shaderId) {
        return false;
    }

    *shaderIds->append() = shaderId;
    if (inputs.fFlipY) {
        GrProgramDesc* d = this->desc();
        d->setSurfaceOriginKey(GrGLSLFragmentShaderBuilder::KeyForSurfaceOrigin(
                                                     this->pipeline().proxy()->origin()));
        d->finalize();
    }

    return true;
}

static int get_glprograms_max_stages(const sk_gpu_test::ContextInfo& ctxInfo) {
    GrContext* context = ctxInfo.grContext();
    GrGLGpu* gpu = static_cast<GrGLGpu*>(context->contextPriv().getGpu());
    int maxStages = 6;
    if (kGLES_GrGLStandard == gpu->glStandard()) {
    // We've had issues with driver crashes and HW limits being exceeded with many effects on
    // Android devices. We have passes on ARM devices with the default number of stages.
    // TODO When we run ES 3.00 GLSL in more places, test again
#ifdef SK_BUILD_FOR_ANDROID
        if (kARM_GrGLVendor != gpu->ctxInfo().vendor()) {
            maxStages = 1;
        }
#endif
    // On iOS we can exceed the maximum number of varyings. http://skbug.com/6627.
#ifdef SK_BUILD_FOR_IOS
        maxStages = 3;
#endif
    }
    if (ctxInfo.type() == sk_gpu_test::GrContextFactory::kANGLE_D3D9_ES2_ContextType ||
        ctxInfo.type() == sk_gpu_test::GrContextFactory::kANGLE_D3D11_ES2_ContextType) {
        // On Angle D3D we will hit a limit of out variables if we use too many stages.
        maxStages = 3;
    }
    return maxStages;
}

const char* GrGLFragmentShaderBuilder::fragmentPosition() {
    fHasReadFragmentPosition = true;

    GrGLGpu* gpu = fProgramBuilder->gpu();
    // We only declare "gl_FragCoord" when we're in the case where we want to use layout qualifiers
    // to reverse y. Otherwise it isn't necessary and whether the "in" qualifier appears in the
    // declaration varies in earlier GLSL specs. So it is simpler to omit it.
    if (fTopLeftFragPosRead) {
        fSetupFragPosition = true;
        return "gl_FragCoord";
    } else if (gpu->glCaps().fragCoordConventionsSupport()) {
        if (!fSetupFragPosition) {
            if (gpu->glslGeneration() < k150_GrGLSLGeneration) {
                this->addFeature(1 << kFragCoordConventions_GLSLPrivateFeature,
                                 "GL_ARB_fragment_coord_conventions");
            }
            fInputs.push_back().set(kVec4f_GrSLType,
                                    GrGLShaderVar::kIn_TypeModifier,
                                    "gl_FragCoord",
                                    kDefault_GrSLPrecision,
                                    GrGLShaderVar::kUpperLeft_Origin);
            fSetupFragPosition = true;
        }
        return "gl_FragCoord";
    } else {
        static const char* kTempName = "tmpXYFragCoord";
        static const char* kCoordName = "fragCoordYDown";
        if (!fSetupFragPosition) {
            // temporarily change the stage index because we're inserting non-stage code.
            GrGLProgramBuilder::AutoStageRestore asr(fProgramBuilder);
            SkASSERT(!fProgramBuilder->fUniformHandles.fRTHeightUni.isValid());
            const char* rtHeightName;

            fProgramBuilder->fUniformHandles.fRTHeightUni =
                    fProgramBuilder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                                kFloat_GrSLType,
                                                kDefault_GrSLPrecision,
                                                "RTHeight",
                                                &rtHeightName);

            // The Adreno compiler seems to be very touchy about access to "gl_FragCoord".
            // Accessing glFragCoord.zw can cause a program to fail to link. Additionally,
            // depending on the surrounding code, accessing .xy with a uniform involved can
            // do the same thing. Copying gl_FragCoord.xy into a temp vec2 beforehand 
            // (and only accessing .xy) seems to "fix" things.
            this->codePrependf("\tvec4 %s = vec4(%s.x, %s - %s.y, 1.0, 1.0);\n",
                               kCoordName, kTempName, rtHeightName, kTempName);
            this->codePrependf("vec2 %s = gl_FragCoord.xy;", kTempName);
            fSetupFragPosition = true;
        }
        SkASSERT(fProgramBuilder->fUniformHandles.fRTHeightUni.isValid());
        return kCoordName;
    }
}

DEF_GPUTEST(GLPrograms, reporter, factory) {
    // Set a locale that would cause shader compilation to fail because of , as decimal separator.
    // skbug 3330
#ifdef SK_BUILD_FOR_WIN
    GrAutoLocaleSetter als("sv-SE");
#else
    GrAutoLocaleSetter als("sv_SE.UTF-8");
#endif

    // We suppress prints to avoid spew
    GrContextOptions opts;
    opts.fSuppressPrints = true;
    GrContextFactory debugFactory(opts);
    for (int type = 0; type < GrContextFactory::kLastGLContextType; ++type) {
        GrContext* context = debugFactory.get(static_cast<GrContextFactory::GLContextType>(type));
        if (context) {
            GrGLGpu* gpu = static_cast<GrGLGpu*>(context->getGpu());

            /*
             * For the time being, we only support the test with desktop GL or for android on
             * ARM platforms
             * TODO When we run ES 3.00 GLSL in more places, test again
             */
            int maxStages;
            if (kGL_GrGLStandard == gpu->glStandard() ||
                kARM_GrGLVendor == gpu->ctxInfo().vendor()) {
                maxStages = 6;
            } else if (kTegra3_GrGLRenderer == gpu->ctxInfo().renderer() ||
                       kOther_GrGLRenderer == gpu->ctxInfo().renderer()) {
                maxStages = 1;
            } else {
                return;
            }
#if SK_ANGLE
            // Some long shaders run out of temporary registers in the D3D compiler on ANGLE.
            if (type == GrContextFactory::kANGLE_GLContextType) {
                maxStages = 2;
            }
#endif
#if SK_COMMAND_BUFFER
            // Some long shaders run out of temporary registers in the D3D compiler on ANGLE.
            // TODO(hendrikw): This only needs to happen with the ANGLE comand buffer backend.
            if (type == GrContextFactory::kCommandBuffer_GLContextType) {
                maxStages = 2;
            }
#endif
            GrTestTarget testTarget;
            context->getTestTarget(&testTarget);
            REPORTER_ASSERT(reporter, GrDrawingManager::ProgramUnitTest(
                                            context, testTarget.target(), maxStages));
        }
    }
}

const char* GrGLFragmentShaderBuilder::fragmentPosition() {
    fHasReadFragmentPosition = true;

    GrGLGpu* gpu = fProgramBuilder->gpu();
    // We only declare "gl_FragCoord" when we're in the case where we want to use layout qualifiers
    // to reverse y. Otherwise it isn't necessary and whether the "in" qualifier appears in the
    // declaration varies in earlier GLSL specs. So it is simpler to omit it.
    if (fTopLeftFragPosRead) {
        fSetupFragPosition = true;
        return "gl_FragCoord";
    } else if (gpu->glCaps().fragCoordConventionsSupport()) {
        if (!fSetupFragPosition) {
            if (gpu->glslGeneration() < k150_GrGLSLGeneration) {
                this->addFeature(1 << kFragCoordConventions_GLSLPrivateFeature,
                                 "GL_ARB_fragment_coord_conventions");
            }
            fInputs.push_back().set(kVec4f_GrSLType,
                                    GrGLShaderVar::kIn_TypeModifier,
                                    "gl_FragCoord",
                                    kDefault_GrSLPrecision,
                                    GrGLShaderVar::kUpperLeft_Origin);
            fSetupFragPosition = true;
        }
        return "gl_FragCoord";
    } else {
        static const char* kCoordName = "fragCoordYDown";
        if (!fSetupFragPosition) {
            // temporarily change the stage index because we're inserting non-stage code.
            GrGLProgramBuilder::AutoStageRestore asr(fProgramBuilder);
            SkASSERT(!fProgramBuilder->fUniformHandles.fRTHeightUni.isValid());
            const char* rtHeightName;

            fProgramBuilder->fUniformHandles.fRTHeightUni =
                    fProgramBuilder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                                kFloat_GrSLType,
                                                kDefault_GrSLPrecision,
                                                "RTHeight",
                                                &rtHeightName);

            // Using glFragCoord.zw for the last two components tickles an Adreno driver bug that
            // causes programs to fail to link. Making this function return a vec2() didn't fix the
            // problem but using 1.0 for the last two components does.
            this->codePrependf("\tvec4 %s = vec4(gl_FragCoord.x, %s - gl_FragCoord.y, 1.0, "
                               "1.0);\n", kCoordName, rtHeightName);
            fSetupFragPosition = true;
        }
        SkASSERT(fProgramBuilder->fUniformHandles.fRTHeightUni.isValid());
        return kCoordName;
    }
}

static int get_glprograms_max_stages(GrContext* context) {
    GrGLGpu* gpu = static_cast<GrGLGpu*>(context->getGpu());
    /*
     * For the time being, we only support the test with desktop GL or for android on
     * ARM platforms
     * TODO When we run ES 3.00 GLSL in more places, test again
     */
    if (kGL_GrGLStandard == gpu->glStandard() ||
        kARM_GrGLVendor == gpu->ctxInfo().vendor()) {
        return 6;
    } else if (kTegra3_GrGLRenderer == gpu->ctxInfo().renderer() ||
               kOther_GrGLRenderer == gpu->ctxInfo().renderer()) {
        return 1;
    }
    return 0;
}

bool GrGLFragmentShaderBuilder::compileAndAttachShaders(GrGLuint programId,
                                                        SkTDArray<GrGLuint>* shaderIds) {
    GrGLGpu* gpu = fProgramBuilder->gpu();
    this->versionDecl() = GrGLGetGLSLVersionDecl(gpu->ctxInfo());
    GrGLAppendGLSLDefaultFloatPrecisionDeclaration(kDefault_GrSLPrecision,
                                                   gpu->glStandard(),
                                                   &this->precisionQualifier());
    this->compileAndAppendLayoutQualifiers();
    fProgramBuilder->appendUniformDecls(GrGLProgramBuilder::kFragment_Visibility,
                                        &this->uniforms());
    this->appendDecls(fInputs, &this->inputs());
    // We shouldn't have declared outputs on 1.10
    SkASSERT(k110_GrGLSLGeneration != gpu->glslGeneration() || fOutputs.empty());
    this->appendDecls(fOutputs, &this->outputs());
    return this->finalize(programId, GR_GL_FRAGMENT_SHADER, shaderIds);
}

void GrGLPathRange::onInitPath(int index, const SkPath& skPath) const {
    GrGLGpu* gpu = static_cast<GrGLGpu*>(this->getGpu());
    if (NULL == gpu) {
        return;
    }

    // Make sure the path at this index hasn't been initted already.
    SkDEBUGCODE(
        GrGLboolean isPath;
        GR_GL_CALL_RET(gpu->glInterface(), isPath, IsPath(fBasePathID + index)));
    SkASSERT(GR_GL_FALSE == isPath);

    GrGLPath::InitPathObject(gpu, fBasePathID + index, skPath, this->getStroke());

    // TODO: Use a better approximation for the individual path sizes.
    fGpuMemorySize += 100;
}

void GrGLPathRendering::onStencilPath(const StencilPathArgs& args, const GrPath* path) {
    GrGLGpu* gpu = this->gpu();
    SkASSERT(gpu->caps()->shaderCaps()->pathRenderingSupport());
    gpu->flushColorWrite(false);
    gpu->flushDrawFace(GrPipelineBuilder::kBoth_DrawFace);

    GrGLRenderTarget* rt = static_cast<GrGLRenderTarget*>(args.fRenderTarget);
    SkISize size = SkISize::Make(rt->width(), rt->height());
    this->setProjectionMatrix(*args.fViewMatrix, size, rt->origin());
    gpu->flushScissor(*args.fScissor, rt->getViewport(), rt->origin());
    gpu->flushHWAAState(rt, args.fUseHWAA);
    gpu->flushRenderTarget(rt, NULL);

    const GrGLPath* glPath = static_cast<const GrGLPath*>(path);

    this->flushPathStencilSettings(*args.fStencil);
    SkASSERT(!fHWPathStencilSettings.isTwoSided());

    GrGLenum fillMode = gr_stencil_op_to_gl_path_rendering_fill_mode(
        fHWPathStencilSettings.passOp(GrStencilSettings::kFront_Face));
    GrGLint writeMask = fHWPathStencilSettings.writeMask(GrStencilSettings::kFront_Face);

    if (glPath->shouldFill()) {
        GL_CALL(StencilFillPath(glPath->pathID(), fillMode, writeMask));
    }
    if (glPath->shouldStroke()) {
        GL_CALL(StencilStrokePath(glPath->pathID(), 0xffff, writeMask));
    }
}

bool GrGLFragmentShaderBuilder::enableFeature(GLSLFeature feature) {
    switch (feature) {
        case kStandardDerivatives_GLSLFeature: {
            GrGLGpu* gpu = fProgramBuilder->gpu();
            if (!gpu->glCaps().shaderCaps()->shaderDerivativeSupport()) {
                return false;
            }
            if (kGLES_GrGLStandard == gpu->glStandard() &&
                k110_GrGLSLGeneration == gpu->glslGeneration()) {
                this->addFeature(1 << kStandardDerivatives_GLSLFeature,
                                 "GL_OES_standard_derivatives");
            }
            return true;
        }
        default:
            SkFAIL("Unexpected GLSLFeature requested.");
            return false;
    }
}

const char* GrGLFragmentShaderBuilder::dstColor() {
    fHasReadDstColor = true;

    GrGLGpu* gpu = fProgramBuilder->gpu();
    if (gpu->glCaps().glslCaps()->fbFetchSupport()) {
        this->addFeature(1 << (GrGLFragmentShaderBuilder::kLastGLSLPrivateFeature + 1),
                         gpu->glCaps().glslCaps()->fbFetchExtensionString());

        // Some versions of this extension string require declaring custom color output on ES 3.0+
        const char* fbFetchColorName = gpu->glCaps().glslCaps()->fbFetchColorName();
        if (gpu->glCaps().glslCaps()->fbFetchNeedsCustomOutput()) {
            this->enableCustomOutput();
            fOutputs[fCustomColorOutputIndex].setTypeModifier(GrShaderVar::kInOut_TypeModifier);
            fbFetchColorName = declared_color_output_name();
        }
        return fbFetchColorName;
    } else {
        return kDstTextureColorName;
    } 
}

void GrGLPathRange::onInitPath(int index, const SkPath& origSkPath) const {
    GrGLGpu* gpu = static_cast<GrGLGpu*>(this->getGpu());
    if (NULL == gpu) {
        return;
    }

    // Make sure the path at this index hasn't been initted already.
    SkDEBUGCODE(
        GrGLboolean isPath;
        GR_GL_CALL_RET(gpu->glInterface(), isPath, IsPath(fBasePathID + index)));
    SkASSERT(GR_GL_FALSE == isPath);

    const SkPath* skPath = &origSkPath;
    SkTLazy<SkPath> tmpPath;
    const GrStrokeInfo* stroke = &fStroke;
    GrStrokeInfo tmpStroke(SkStrokeRec::kFill_InitStyle);

    // Dashing must be applied to the path. However, if dashing is present,
    // we must convert all the paths to fills. The GrStrokeInfo::applyDash leaves
    // simple paths as strokes but converts other paths to fills.
    // Thus we must stroke the strokes here, so that all paths in the
    // path range are using the same style.
    if (fStroke.isDashed()) {
        if (!stroke->applyDashToPath(tmpPath.init(), &tmpStroke, *skPath)) {
            return;
        }
        skPath = tmpPath.get();
        stroke = &tmpStroke;
        if (tmpStroke.needToApply()) {
            if (!tmpStroke.applyToPath(tmpPath.get(), *tmpPath.get())) {
                return;
            }
            tmpStroke.setFillStyle();
        }
    }

    GrGLPath::InitPathObject(gpu, fBasePathID + index, *skPath, *stroke);

    // TODO: Use a better approximation for the individual path sizes.
    fGpuMemorySize += 100;
}

bool GrGLProgramBuilder::compileAndAttachShaders(GrGLSLShaderBuilder& shader,
                                                 GrGLuint programId,
                                                 GrGLenum type,
                                                 SkTDArray<GrGLuint>* shaderIds) {
    GrGLGpu* gpu = this->gpu();
    GrGLuint shaderId = GrGLCompileAndAttachShader(gpu->glContext(),
                                                   programId,
                                                   type,
                                                   shader.fCompilerStrings.begin(),
                                                   shader.fCompilerStringLengths.begin(),
                                                   shader.fCompilerStrings.count(),
                                                   gpu->stats());

    if (!shaderId) {
        return false;
    }

    *shaderIds->append() = shaderId;

    return true;
}

bool GrGLVertexBuilder::compileAndAttachShaders(GrGLuint programId,
        SkTDArray<GrGLuint>* shaderIds) const {
    GrGLGpu* gpu = fProgramBuilder->gpu();
    const GrGLContext& glCtx = gpu->glContext();
    const GrGLContextInfo& ctxInfo = gpu->ctxInfo();
    SkString vertShaderSrc(GrGetGLSLVersionDecl(ctxInfo));
    fProgramBuilder->appendUniformDecls(GrGLProgramBuilder::kVertex_Visibility, &vertShaderSrc);
    this->appendDecls(fInputs, &vertShaderSrc);
    this->appendDecls(fOutputs, &vertShaderSrc);
    vertShaderSrc.append("void main() {");
    vertShaderSrc.append(fCode);
    vertShaderSrc.append("}\n");
    GrGLuint vertShaderId = GrGLCompileAndAttachShader(glCtx, programId,
                                                       GR_GL_VERTEX_SHADER, vertShaderSrc,
                                                       gpu->gpuStats());
    if (!vertShaderId) {
        return false;
    }
    *shaderIds->append() = vertShaderId;
    return true;
}

bool GrGLFragmentShaderBuilder::compileAndAttachShaders(GrGLuint programId,
                                                        SkTDArray<GrGLuint>* shaderIds) const {
    GrGLGpu* gpu = fProgramBuilder->gpu();
    SkString fragShaderSrc(GrGetGLSLVersionDecl(gpu->ctxInfo()));
    fragShaderSrc.append(fExtensions);
    append_default_precision_qualifier(kDefault_GrSLPrecision,
                                       gpu->glStandard(),
                                       &fragShaderSrc);
    fProgramBuilder->appendUniformDecls(GrGLProgramBuilder::kFragment_Visibility, &fragShaderSrc);
    this->appendDecls(fInputs, &fragShaderSrc);
    // We shouldn't have declared outputs on 1.10
    SkASSERT(k110_GrGLSLGeneration != gpu->glslGeneration() || fOutputs.empty());
    this->appendDecls(fOutputs, &fragShaderSrc);
    fragShaderSrc.append(fFunctions);
    fragShaderSrc.append("void main() {\n");
    fragShaderSrc.append(fCode);
    fragShaderSrc.append("}\n");

    GrGLuint fragShaderId = GrGLCompileAndAttachShader(gpu->glContext(), programId,
                                                       GR_GL_FRAGMENT_SHADER, fragShaderSrc,
                                                       gpu->gpuStats());
    if (!fragShaderId) {
        return false;
    }

    *shaderIds->append() = fragShaderId;

    return true;
}