C++ GrPipelineBuilder::numCoverageFragmentStages方法代码示例

void GrPipeline::adjustProgramFromOptimizations(const GrPipelineBuilder& pipelineBuilder,
                                                GrXferProcessor::OptFlags flags,
                                                const GrProcOptInfo& colorPOI,
                                                const GrProcOptInfo& coveragePOI,
                                                int* firstColorStageIdx,
                                                int* firstCoverageStageIdx) {
    fReadsFragPosition = fXferProcessor->willReadFragmentPosition();

    if ((flags & GrXferProcessor::kIgnoreColor_OptFlag) ||
        (flags & GrXferProcessor::kOverrideColor_OptFlag)) {
        *firstColorStageIdx = pipelineBuilder.numColorFragmentStages();
    } else {
        if (coveragePOI.readsFragPosition()) {
            fReadsFragPosition = true;
        }
    }

    if (flags & GrXferProcessor::kIgnoreCoverage_OptFlag) {
        *firstCoverageStageIdx = pipelineBuilder.numCoverageFragmentStages();
    } else {
        if (coveragePOI.readsFragPosition()) {
            fReadsFragPosition = true;
        }
    }
}

GrPipeline::GrPipeline(const GrPipelineBuilder& pipelineBuilder,
                       const GrProcOptInfo& colorPOI,
                       const GrProcOptInfo& coveragePOI,
                       const GrDrawTargetCaps& caps,
                       const GrScissorState& scissorState,
                       const GrDeviceCoordTexture* dstCopy) {
    // Create XferProcessor from DS's XPFactory
    SkAutoTUnref<GrXferProcessor> xferProcessor(
        pipelineBuilder.getXPFactory()->createXferProcessor(colorPOI, coveragePOI, dstCopy, caps));

    GrColor overrideColor = GrColor_ILLEGAL;
    if (colorPOI.firstEffectiveStageIndex() != 0) {
        overrideColor = colorPOI.inputColorToEffectiveStage();
    }

    GrXferProcessor::OptFlags optFlags;
    if (xferProcessor) {
        fXferProcessor.reset(xferProcessor.get());

        optFlags = xferProcessor->getOptimizations(colorPOI,
                                                   coveragePOI,
                                                   pipelineBuilder.getStencil().doesWrite(),
                                                   &overrideColor,
                                                   caps);
    }

    // When path rendering the stencil settings are not always set on the GrPipelineBuilder
    // so we must check the draw type. In cases where we will skip drawing we simply return a
    // null GrPipeline.
    if (!xferProcessor || (GrXferProcessor::kSkipDraw_OptFlag & optFlags)) {
        // Set the fields that don't default init and return. The lack of a render target will
        // indicate that this can be skipped.
        fFlags = 0;
        fDrawFace = GrPipelineBuilder::kInvalid_DrawFace;
        return;
    }

    fRenderTarget.reset(pipelineBuilder.fRenderTarget.get());
    SkASSERT(fRenderTarget);
    fScissorState = scissorState;
    fStencilSettings = pipelineBuilder.getStencil();
    fDrawFace = pipelineBuilder.getDrawFace();

    fFlags = 0;
    if (pipelineBuilder.isHWAntialias()) {
        fFlags |= kHWAA_Flag;
    }
    if (pipelineBuilder.isDither()) {
        fFlags |= kDither_Flag;
    }
    if (pipelineBuilder.snapVerticesToPixelCenters()) {
        fFlags |= kSnapVertices_Flag;
    }

    int firstColorStageIdx = colorPOI.firstEffectiveStageIndex();

    // TODO: Once we can handle single or four channel input into coverage stages then we can use
    // GrPipelineBuilder's coverageProcInfo (like color above) to set this initial information.
    int firstCoverageStageIdx = 0;

    this->adjustProgramFromOptimizations(pipelineBuilder, optFlags, colorPOI, coveragePOI,
                                         &firstColorStageIdx, &firstCoverageStageIdx);

    bool usesLocalCoords = false;

    // Copy Stages from PipelineBuilder to Pipeline
    for (int i = firstColorStageIdx; i < pipelineBuilder.numColorFragmentStages(); ++i) {
        SkNEW_APPEND_TO_TARRAY(&fFragmentStages,
                               GrPendingFragmentStage,
                               (pipelineBuilder.fColorStages[i]));
        usesLocalCoords = usesLocalCoords ||
                          pipelineBuilder.fColorStages[i].processor()->usesLocalCoords();
    }

    fNumColorStages = fFragmentStages.count();
    for (int i = firstCoverageStageIdx; i < pipelineBuilder.numCoverageFragmentStages(); ++i) {
        SkNEW_APPEND_TO_TARRAY(&fFragmentStages,
                               GrPendingFragmentStage,
                               (pipelineBuilder.fCoverageStages[i]));
        usesLocalCoords = usesLocalCoords ||
                          pipelineBuilder.fCoverageStages[i].processor()->usesLocalCoords();
    }

    // let the GP init the batch tracker
    fInitBT.fColorIgnored = SkToBool(optFlags & GrXferProcessor::kIgnoreColor_OptFlag);
    fInitBT.fOverrideColor = fInitBT.fColorIgnored ? GrColor_ILLEGAL : overrideColor;
    fInitBT.fCoverageIgnored = SkToBool(optFlags & GrXferProcessor::kIgnoreCoverage_OptFlag);
    fInitBT.fUsesLocalCoords = usesLocalCoords;
    fInitBT.fCanTweakAlphaForCoverage =
        SkToBool(optFlags & GrXferProcessor::kCanTweakAlphaForCoverage_OptFlag);
}

bool GrDrawTarget::checkDraw(const GrPipelineBuilder& pipelineBuilder,
                             const GrGeometryProcessor* gp,
                             GrPrimitiveType type,
                             int startVertex,
                             int startIndex,
                             int vertexCount,
                             int indexCount) const {
#ifdef SK_DEBUG
    const GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
    int maxVertex = startVertex + vertexCount;
    int maxValidVertex;
    switch (geoSrc.fVertexSrc) {
        case kNone_GeometrySrcType:
            SkFAIL("Attempting to draw without vertex src.");
        case kReserved_GeometrySrcType: // fallthrough
            maxValidVertex = geoSrc.fVertexCount;
            break;
        case kBuffer_GeometrySrcType:
            maxValidVertex = static_cast<int>(geoSrc.fVertexBuffer->gpuMemorySize() /
                                              geoSrc.fVertexSize);
            break;
    }
    if (maxVertex > maxValidVertex) {
        SkFAIL("Drawing outside valid vertex range.");
    }
    if (indexCount > 0) {
        int maxIndex = startIndex + indexCount;
        int maxValidIndex;
        switch (geoSrc.fIndexSrc) {
            case kNone_GeometrySrcType:
                SkFAIL("Attempting to draw indexed geom without index src.");
            case kReserved_GeometrySrcType: // fallthrough
                maxValidIndex = geoSrc.fIndexCount;
                break;
            case kBuffer_GeometrySrcType:
                maxValidIndex = static_cast<int>(geoSrc.fIndexBuffer->gpuMemorySize() /
                                                 sizeof(uint16_t));
                break;
        }
        if (maxIndex > maxValidIndex) {
            SkFAIL("Index reads outside valid index range.");
        }
    }

    SkASSERT(pipelineBuilder.getRenderTarget());

    if (gp) {
        int numTextures = gp->numTextures();
        for (int t = 0; t < numTextures; ++t) {
            GrTexture* texture = gp->texture(t);
            SkASSERT(texture->asRenderTarget() != pipelineBuilder.getRenderTarget());
        }
    }

    for (int s = 0; s < pipelineBuilder.numColorFragmentStages(); ++s) {
        const GrProcessor* effect = pipelineBuilder.getColorFragmentStage(s).processor();
        int numTextures = effect->numTextures();
        for (int t = 0; t < numTextures; ++t) {
            GrTexture* texture = effect->texture(t);
            SkASSERT(texture->asRenderTarget() != pipelineBuilder.getRenderTarget());
        }
    }
    for (int s = 0; s < pipelineBuilder.numCoverageFragmentStages(); ++s) {
        const GrProcessor* effect = pipelineBuilder.getCoverageFragmentStage(s).processor();
        int numTextures = effect->numTextures();
        for (int t = 0; t < numTextures; ++t) {
            GrTexture* texture = effect->texture(t);
            SkASSERT(texture->asRenderTarget() != pipelineBuilder.getRenderTarget());
        }
    }

#endif
    if (NULL == pipelineBuilder.getRenderTarget()) {
        return false;
    }
    return true;
}