C++ DrawInfo::instanceCount方法代码示例

void GrInOrderDrawBuffer::onDraw(const DrawInfo& info) {

    GeometryPoolState& poolState = fGeoPoolStateStack.back();
    const GrDrawState& drawState = this->getDrawState();
    AutoClipReenable acr;

    if (drawState.isClipState() &&
        info.getDevBounds() &&
        this->quickInsideClip(*info.getDevBounds())) {
        acr.set(this->drawState());
    }

    this->recordClipIfNecessary();
    this->recordStateIfNecessary();

    const GrVertexBuffer* vb;
    if (kBuffer_GeometrySrcType == this->getGeomSrc().fVertexSrc) {
        vb = this->getGeomSrc().fVertexBuffer;
    } else {
        vb = poolState.fPoolVertexBuffer;
    }

    const GrIndexBuffer* ib = NULL;
    if (info.isIndexed()) {
        if (kBuffer_GeometrySrcType == this->getGeomSrc().fIndexSrc) {
            ib = this->getGeomSrc().fIndexBuffer;
        } else {
            ib = poolState.fPoolIndexBuffer;
        }
    }

    Draw* draw;
    if (info.isInstanced()) {
        int instancesConcated = this->concatInstancedDraw(info);
        if (info.instanceCount() > instancesConcated) {
            draw = GrNEW_APPEND_TO_RECORDER(fCmdBuffer, Draw, (info, vb, ib));
            draw->fInfo.adjustInstanceCount(-instancesConcated);
        } else {
            return;
        }
    } else {
        draw = GrNEW_APPEND_TO_RECORDER(fCmdBuffer, Draw, (info, vb, ib));
    }
    this->recordTraceMarkersIfNecessary();

    // Adjust the starting vertex and index when we are using reserved or array sources to
    // compensate for the fact that the data was inserted into a larger vb/ib owned by the pool.
    if (kBuffer_GeometrySrcType != this->getGeomSrc().fVertexSrc) {
        size_t bytes = (info.vertexCount() + info.startVertex()) * drawState.getVertexStride();
        poolState.fUsedPoolVertexBytes = SkTMax(poolState.fUsedPoolVertexBytes, bytes);
        draw->fInfo.adjustStartVertex(poolState.fPoolStartVertex);
    }
    
    if (info.isIndexed() && kBuffer_GeometrySrcType != this->getGeomSrc().fIndexSrc) {
        size_t bytes = (info.indexCount() + info.startIndex()) * sizeof(uint16_t);
        poolState.fUsedPoolIndexBytes = SkTMax(poolState.fUsedPoolIndexBytes, bytes);
        draw->fInfo.adjustStartIndex(poolState.fPoolStartIndex);
    }
}

int GrInOrderDrawBuffer::concatInstancedDraw(const DrawInfo& info) {
    GrAssert(info.isInstanced());

    const GeometrySrcState& geomSrc = this->getGeomSrc();
    const GrDrawState& drawState = this->getDrawState();

    // we only attempt to concat the case when reserved verts are used with a client-specified index
    // buffer. To make this work with client-specified VBs we'd need to know if the VB was updated
    // between draws.
    if (kReserved_GeometrySrcType != geomSrc.fVertexSrc ||
        kBuffer_GeometrySrcType != geomSrc.fIndexSrc) {
        return 0;
    }
    // Check if there is a draw info that is compatible that uses the same VB from the pool and
    // the same IB
    if (kDraw_Cmd != fCmds.back()) {
        return 0;
    }

    DrawRecord* draw = &fDraws.back();
    GeometryPoolState& poolState = fGeoPoolStateStack.back();
    const GrVertexBuffer* vertexBuffer = poolState.fPoolVertexBuffer;

    if (!draw->isInstanced() ||
        draw->verticesPerInstance() != info.verticesPerInstance() ||
        draw->indicesPerInstance() != info.indicesPerInstance() ||
        draw->fVertexBuffer != vertexBuffer ||
        draw->fIndexBuffer != geomSrc.fIndexBuffer) {
        return 0;
    }
    // info does not yet account for the offset from the start of the pool's VB while the previous
    // draw record does.
    int adjustedStartVertex = poolState.fPoolStartVertex + info.startVertex();
    if (draw->startVertex() + draw->vertexCount() != adjustedStartVertex) {
        return 0;
    }

    GrAssert(poolState.fPoolStartVertex == draw->startVertex() + draw->vertexCount());

    // how many instances can be concat'ed onto draw given the size of the index buffer
    int instancesToConcat = this->indexCountInCurrentSource() / info.indicesPerInstance();
    instancesToConcat -= draw->instanceCount();
    instancesToConcat = GrMin(instancesToConcat, info.instanceCount());

    // update the amount of reserved vertex data actually referenced in draws
    size_t vertexBytes = instancesToConcat * info.verticesPerInstance() *
                         drawState.getVertexSize();
    poolState.fUsedPoolVertexBytes = GrMax(poolState.fUsedPoolVertexBytes, vertexBytes);

    draw->adjustInstanceCount(instancesToConcat);
    return instancesToConcat;
}

void GrInOrderDrawBuffer::onDraw(const DrawInfo& info) {

    GeometryPoolState& poolState = fGeoPoolStateStack.back();
    const GrDrawState& drawState = this->getDrawState();
    AutoClipReenable acr;

    if (drawState.isClipState() &&
        NULL != info.getDevBounds() &&
        this->quickInsideClip(*info.getDevBounds())) {
        acr.set(this->drawState());
    }

    if (this->needsNewClip()) {
       this->recordClip();
    }
    if (this->needsNewState()) {
        this->recordState();
    }

    DrawRecord* draw;
    if (info.isInstanced()) {
        int instancesConcated = this->concatInstancedDraw(info);
        if (info.instanceCount() > instancesConcated) {
            draw = this->recordDraw(info);
            draw->adjustInstanceCount(-instancesConcated);
        } else {
            return;
        }
    } else {
        draw = this->recordDraw(info);
    }

    switch (this->getGeomSrc().fVertexSrc) {
        case kBuffer_GeometrySrcType:
            draw->fVertexBuffer = this->getGeomSrc().fVertexBuffer;
            break;
        case kReserved_GeometrySrcType: // fallthrough
        case kArray_GeometrySrcType: {
            size_t vertexBytes = (info.vertexCount() + info.startVertex()) *
                                 drawState.getVertexSize();
            poolState.fUsedPoolVertexBytes = GrMax(poolState.fUsedPoolVertexBytes, vertexBytes);
            draw->fVertexBuffer = poolState.fPoolVertexBuffer;
            draw->adjustStartVertex(poolState.fPoolStartVertex);
            break;
        }
        default:
            GrCrash("unknown geom src type");
    }
    draw->fVertexBuffer->ref();

    if (info.isIndexed()) {
        switch (this->getGeomSrc().fIndexSrc) {
            case kBuffer_GeometrySrcType:
                draw->fIndexBuffer = this->getGeomSrc().fIndexBuffer;
                break;
            case kReserved_GeometrySrcType: // fallthrough
            case kArray_GeometrySrcType: {
                size_t indexBytes = (info.indexCount() + info.startIndex()) * sizeof(uint16_t);
                poolState.fUsedPoolIndexBytes = GrMax(poolState.fUsedPoolIndexBytes, indexBytes);
                draw->fIndexBuffer = poolState.fPoolIndexBuffer;
                draw->adjustStartIndex(poolState.fPoolStartIndex);
                break;
            }
            default:
                GrCrash("unknown geom src type");
        }
        draw->fIndexBuffer->ref();
    } else {
        draw->fIndexBuffer = NULL;
    }
}

int GrInOrderDrawBuffer::concatInstancedDraw(const DrawInfo& info) {
    SkASSERT(!fCmdBuffer.empty());
    SkASSERT(info.isInstanced());

    const GeometrySrcState& geomSrc = this->getGeomSrc();
    const GrDrawState& drawState = this->getDrawState();

    // we only attempt to concat the case when reserved verts are used with a client-specified index
    // buffer. To make this work with client-specified VBs we'd need to know if the VB was updated
    // between draws.
    if (kReserved_GeometrySrcType != geomSrc.fVertexSrc ||
        kBuffer_GeometrySrcType != geomSrc.fIndexSrc) {
        return 0;
    }
    // Check if there is a draw info that is compatible that uses the same VB from the pool and
    // the same IB
    if (kDraw_Cmd != strip_trace_bit(fCmdBuffer.back().fType)) {
        return 0;
    }

    Draw* draw = static_cast<Draw*>(&fCmdBuffer.back());
    GeometryPoolState& poolState = fGeoPoolStateStack.back();
    const GrVertexBuffer* vertexBuffer = poolState.fPoolVertexBuffer;

    if (!draw->fInfo.isInstanced() ||
        draw->fInfo.verticesPerInstance() != info.verticesPerInstance() ||
        draw->fInfo.indicesPerInstance() != info.indicesPerInstance() ||
        draw->vertexBuffer() != vertexBuffer ||
        draw->indexBuffer() != geomSrc.fIndexBuffer) {
        return 0;
    }
    // info does not yet account for the offset from the start of the pool's VB while the previous
    // draw record does.
    int adjustedStartVertex = poolState.fPoolStartVertex + info.startVertex();
    if (draw->fInfo.startVertex() + draw->fInfo.vertexCount() != adjustedStartVertex) {
        return 0;
    }

    SkASSERT(poolState.fPoolStartVertex == draw->fInfo.startVertex() + draw->fInfo.vertexCount());

    // how many instances can be concat'ed onto draw given the size of the index buffer
    int instancesToConcat = this->indexCountInCurrentSource() / info.indicesPerInstance();
    instancesToConcat -= draw->fInfo.instanceCount();
    instancesToConcat = SkTMin(instancesToConcat, info.instanceCount());

    // update the amount of reserved vertex data actually referenced in draws
    size_t vertexBytes = instancesToConcat * info.verticesPerInstance() *
                         drawState.getVertexStride();
    poolState.fUsedPoolVertexBytes = SkTMax(poolState.fUsedPoolVertexBytes, vertexBytes);

    draw->fInfo.adjustInstanceCount(instancesToConcat);

    // update last fGpuCmdMarkers to include any additional trace markers that have been added
    if (this->getActiveTraceMarkers().count() > 0) {
        if (cmd_has_trace_marker(draw->fType)) {
            fGpuCmdMarkers.back().addSet(this->getActiveTraceMarkers());
        } else {
            fGpuCmdMarkers.push_back(this->getActiveTraceMarkers());
            draw->fType = add_trace_bit(draw->fType);
        }
    }

    return instancesToConcat;
}