C++ GrPrimitiveProcessor::getGLSLProcessorKey方法代码示例

bool GrVkProgramDescBuilder::Build(GrProgramDesc* desc,
                                   const GrPrimitiveProcessor& primProc,
                                   const GrPipeline& pipeline,
                                   const GrGLSLCaps& glslCaps) {
    // The descriptor is used as a cache key. Thus when a field of the
    // descriptor will not affect program generation (because of the attribute
    // bindings in use or other descriptor field settings) it should be set
    // to a canonical value to avoid duplicate programs with different keys.

    GrVkProgramDesc* vkDesc = (GrVkProgramDesc*)desc;

    GR_STATIC_ASSERT(0 == kProcessorKeysOffset % sizeof(uint32_t));
    // Make room for everything up to the effect keys.
    vkDesc->key().reset();
    vkDesc->key().push_back_n(kProcessorKeysOffset);

    GrProcessorKeyBuilder b(&vkDesc->key());

    primProc.getGLSLProcessorKey(glslCaps, &b);
    if (!gen_meta_key(primProc, glslCaps, 0, &b)) {
        vkDesc->key().reset();
        return false;
    }
    GrProcessor::RequiredFeatures requiredFeatures = primProc.requiredFeatures();

    for (int i = 0; i < pipeline.numFragmentProcessors(); ++i) {
        const GrFragmentProcessor& fp = pipeline.getFragmentProcessor(i);
        if (!gen_frag_proc_and_meta_keys(primProc, fp, glslCaps, &b)) {
            vkDesc->key().reset();
            return false;
        }
        requiredFeatures |= fp.requiredFeatures();
    }

    const GrXferProcessor& xp = pipeline.getXferProcessor();
    xp.getGLSLProcessorKey(glslCaps, &b);
    if (!gen_meta_key(xp, glslCaps, 0, &b)) {
        vkDesc->key().reset();
        return false;
    }
    requiredFeatures |= xp.requiredFeatures();

    // --------DO NOT MOVE HEADER ABOVE THIS LINE--------------------------------------------------
    // Because header is a pointer into the dynamic array, we can't push any new data into the key
    // below here.
    KeyHeader* header = vkDesc->atOffset<KeyHeader, kHeaderOffset>();

    // make sure any padding in the header is zeroed.
    memset(header, 0, kHeaderSize);

    GrRenderTarget* rt = pipeline.getRenderTarget();

    if (requiredFeatures & (GrProcessor::kFragmentPosition_RequiredFeature |
                            GrProcessor::kSampleLocations_RequiredFeature)) {
        header->fSurfaceOriginKey = GrGLSLFragmentShaderBuilder::KeyForSurfaceOrigin(rt->origin());
    } else {
        header->fSurfaceOriginKey = 0;
    }

    if (requiredFeatures & GrProcessor::kSampleLocations_RequiredFeature) {
        SkASSERT(pipeline.isHWAntialiasState());
        header->fSamplePatternKey =
            rt->renderTargetPriv().getMultisampleSpecs(pipeline.getStencil()).fUniqueID;
    } else {
        header->fSamplePatternKey = 0;
    }

    header->fOutputSwizzle = glslCaps.configOutputSwizzle(rt->config()).asKey();

    if (pipeline.ignoresCoverage()) {
        header->fIgnoresCoverage = 1;
    } else {
        header->fIgnoresCoverage = 0;
    }

    header->fSnapVerticesToPixelCenters = pipeline.snapVerticesToPixelCenters();
    header->fColorEffectCnt = pipeline.numColorFragmentProcessors();
    header->fCoverageEffectCnt = pipeline.numCoverageFragmentProcessors();
    vkDesc->finalize();
    return true;
}

bool GrGLProgramDescBuilder::Build(GrProgramDesc* desc,
                                   const GrPrimitiveProcessor& primProc,
                                   const GrPipeline& pipeline,
                                   const GrGLGpu* gpu) {
    // The descriptor is used as a cache key. Thus when a field of the
    // descriptor will not affect program generation (because of the attribute
    // bindings in use or other descriptor field settings) it should be set
    // to a canonical value to avoid duplicate programs with different keys.

    GrGLProgramDesc* glDesc = (GrGLProgramDesc*) desc;

    GR_STATIC_ASSERT(0 == kProcessorKeysOffset % sizeof(uint32_t));
    // Make room for everything up to the effect keys.
    glDesc->key().reset();
    glDesc->key().push_back_n(kProcessorKeysOffset);

    GrProcessorKeyBuilder b(&glDesc->key());

    primProc.getGLSLProcessorKey(*gpu->glCaps().glslCaps(), &b);
    //**** use glslCaps here?
    if (!gen_meta_key(primProc, gpu->glCaps(), 0, &b)) {
        glDesc->key().reset();
        return false;
    }

    for (int i = 0; i < pipeline.numFragmentProcessors(); ++i) {
        const GrFragmentProcessor& fp = pipeline.getFragmentProcessor(i);
        if (!gen_frag_proc_and_meta_keys(primProc, fp, gpu->glCaps(), &b)) {
            glDesc->key().reset();
            return false;
        }
    }

    const GrXferProcessor& xp = *pipeline.getXferProcessor();
    xp.getGLSLProcessorKey(*gpu->glCaps().glslCaps(), &b);
    //**** use glslCaps here?
    if (!gen_meta_key(xp, gpu->glCaps(), 0, &b)) {
        glDesc->key().reset();
        return false;
    }

    // --------DO NOT MOVE HEADER ABOVE THIS LINE--------------------------------------------------
    // Because header is a pointer into the dynamic array, we can't push any new data into the key
    // below here.
    KeyHeader* header = glDesc->atOffset<KeyHeader, kHeaderOffset>();

    // make sure any padding in the header is zeroed.
    memset(header, 0, kHeaderSize);

    if (pipeline.readsFragPosition()) {
        header->fFragPosKey =
                GrGLSLFragmentShaderBuilder::KeyForFragmentPosition(pipeline.getRenderTarget());
    } else {
        header->fFragPosKey = 0;
    }
    header->fSnapVerticesToPixelCenters = pipeline.snapVerticesToPixelCenters();
    header->fColorEffectCnt = pipeline.numColorFragmentProcessors();
    header->fCoverageEffectCnt = pipeline.numCoverageFragmentProcessors();
    glDesc->finalize();
    return true;
}