C++ GrMesh::initInstanced方法代码示例

void GrAtlasTextBatch::flush(GrVertexBatch::Target* target, FlushInfo* flushInfo) const {
    GrMesh mesh;
    int maxGlyphsPerDraw =
        static_cast<int>(flushInfo->fIndexBuffer->gpuMemorySize() / sizeof(uint16_t) / 6);
    mesh.initInstanced(kTriangles_GrPrimitiveType, flushInfo->fVertexBuffer,
                       flushInfo->fIndexBuffer, flushInfo->fVertexOffset,
                       kVerticesPerGlyph, kIndicesPerGlyph, flushInfo->fGlyphsToFlush,
                       maxGlyphsPerDraw);
    target->draw(flushInfo->fGeometryProcessor.get(), mesh);
    flushInfo->fVertexOffset += kVerticesPerGlyph * flushInfo->fGlyphsToFlush;
    flushInfo->fGlyphsToFlush = 0;
}

void AAHairlineOp::onPrepareDraws(Target* target) const {
    // Setup the viewmatrix and localmatrix for the GrGeometryProcessor.
    SkMatrix invert;
    if (!this->viewMatrix().invert(&invert)) {
        return;
    }

    // we will transform to identity space if the viewmatrix does not have perspective
    bool hasPerspective = this->viewMatrix().hasPerspective();
    const SkMatrix* geometryProcessorViewM = &SkMatrix::I();
    const SkMatrix* geometryProcessorLocalM = &invert;
    const SkMatrix* toDevice = nullptr;
    const SkMatrix* toSrc = nullptr;
    if (hasPerspective) {
        geometryProcessorViewM = &this->viewMatrix();
        geometryProcessorLocalM = &SkMatrix::I();
        toDevice = &this->viewMatrix();
        toSrc = &invert;
    }

    // This is hand inlined for maximum performance.
    PREALLOC_PTARRAY(128) lines;
    PREALLOC_PTARRAY(128) quads;
    PREALLOC_PTARRAY(128) conics;
    IntArray qSubdivs;
    FloatArray cWeights;
    int quadCount = 0;

    int instanceCount = fPaths.count();
    for (int i = 0; i < instanceCount; i++) {
        const PathData& args = fPaths[i];
        quadCount += gather_lines_and_quads(args.fPath, args.fViewMatrix, args.fDevClipBounds,
                                            &lines, &quads, &conics, &qSubdivs, &cWeights);
    }

    int lineCount = lines.count() / 2;
    int conicCount = conics.count() / 3;

    // do lines first
    if (lineCount) {
        sk_sp<GrGeometryProcessor> lineGP;
        {
            using namespace GrDefaultGeoProcFactory;

            Color color(this->color());
            LocalCoords localCoords(this->usesLocalCoords() ? LocalCoords::kUsePosition_Type :
                                    LocalCoords::kUnused_Type);
            localCoords.fMatrix = geometryProcessorLocalM;
            lineGP = GrDefaultGeoProcFactory::Make(color, Coverage::kAttribute_Type, localCoords,
                                                   *geometryProcessorViewM);
        }

        sk_sp<const GrBuffer> linesIndexBuffer(
            ref_lines_index_buffer(target->resourceProvider()));

        const GrBuffer* vertexBuffer;
        int firstVertex;

        size_t vertexStride = lineGP->getVertexStride();
        int vertexCount = kLineSegNumVertices * lineCount;
        LineVertex* verts = reinterpret_cast<LineVertex*>(
            target->makeVertexSpace(vertexStride, vertexCount, &vertexBuffer, &firstVertex));

        if (!verts|| !linesIndexBuffer) {
            SkDebugf("Could not allocate vertices\n");
            return;
        }

        SkASSERT(lineGP->getVertexStride() == sizeof(LineVertex));

        for (int i = 0; i < lineCount; ++i) {
            add_line(&lines[2*i], toSrc, this->coverage(), &verts);
        }

        GrMesh mesh;
        mesh.initInstanced(kTriangles_GrPrimitiveType, vertexBuffer, linesIndexBuffer.get(),
                           firstVertex, kLineSegNumVertices, kIdxsPerLineSeg, lineCount,
                           kLineSegsNumInIdxBuffer);
        target->draw(lineGP.get(), this->pipeline(), mesh);
    }

    if (quadCount || conicCount) {
        sk_sp<GrGeometryProcessor> quadGP(
            GrQuadEffect::Make(this->color(),
                               *geometryProcessorViewM,
                               kHairlineAA_GrProcessorEdgeType,
                               target->caps(),
                               *geometryProcessorLocalM,
                               this->usesLocalCoords(),
                               this->coverage()));

        sk_sp<GrGeometryProcessor> conicGP(
            GrConicEffect::Make(this->color(),
                                *geometryProcessorViewM,
                                kHairlineAA_GrProcessorEdgeType,
                                target->caps(),
                                *geometryProcessorLocalM,
                                this->usesLocalCoords(),
                                this->coverage()));

//.........这里部分代码省略.........