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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrVertexBatch.h"
#include "GrBatchFlushState.h"
#include "GrResourceProvider.h"
GrVertexBatch::GrVertexBatch(uint32_t classID)
: INHERITED(classID)
, fBaseDrawToken(GrBatchDrawToken::AlreadyFlushedToken()) {
}
void GrVertexBatch::onPrepare(GrBatchFlushState* state) {
Target target(state, this);
this->onPrepareDraws(&target);
}
void* GrVertexBatch::InstancedHelper::init(Target* target, GrPrimitiveType primType,
size_t vertexStride, const GrBuffer* indexBuffer,
int verticesPerInstance, int indicesPerInstance,
int instancesToDraw) {
SkASSERT(target);
if (!indexBuffer) {
return nullptr;
}
const GrBuffer* vertexBuffer;
int firstVertex;
int vertexCount = verticesPerInstance * instancesToDraw;
void* vertices = target->makeVertexSpace(vertexStride, vertexCount, &vertexBuffer, &firstVertex);
if (!vertices) {
SkDebugf("Vertices could not be allocated for instanced rendering.");
return nullptr;
}
SkASSERT(vertexBuffer);
size_t ibSize = indexBuffer->gpuMemorySize();
int maxInstancesPerDraw = static_cast<int>(ibSize / (sizeof(uint16_t) * indicesPerInstance));
fMesh.initInstanced(primType, vertexBuffer, indexBuffer,
firstVertex, verticesPerInstance, indicesPerInstance, instancesToDraw,
maxInstancesPerDraw);
return vertices;
}
void GrVertexBatch::InstancedHelper::recordDraw(Target* target, const GrGeometryProcessor* gp) {
SkASSERT(fMesh.instanceCount());
target->draw(gp, fMesh);
}
void* GrVertexBatch::QuadHelper::init(Target* target, size_t vertexStride,
int quadsToDraw) {
SkAutoTUnref<const GrBuffer> quadIndexBuffer(
target->resourceProvider()->refQuadIndexBuffer());
if (!quadIndexBuffer) {
SkDebugf("Could not get quad index buffer.");
return nullptr;
}
return this->INHERITED::init(target, kTriangles_GrPrimitiveType, vertexStride,
quadIndexBuffer, kVerticesPerQuad, kIndicesPerQuad, quadsToDraw);
}
void GrVertexBatch::onDraw(GrBatchFlushState* state) {
int currUploadIdx = 0;
int currMeshIdx = 0;
SkASSERT(fQueuedDraws.empty() || fBaseDrawToken == state->nextTokenToFlush());
for (int currDrawIdx = 0; currDrawIdx < fQueuedDraws.count(); ++currDrawIdx) {
GrBatchDrawToken drawToken = state->nextTokenToFlush();
while (currUploadIdx < fInlineUploads.count() &&
fInlineUploads[currUploadIdx].fUploadBeforeToken == drawToken) {
state->doUpload(fInlineUploads[currUploadIdx++].fUpload);
}
const QueuedDraw &draw = fQueuedDraws[currDrawIdx];
state->commandBuffer()->draw(*this->pipeline(), *draw.fGeometryProcessor.get(),
fMeshes.begin() + currMeshIdx, draw.fMeshCnt);
currMeshIdx += draw.fMeshCnt;
state->flushToken();
}
SkASSERT(currUploadIdx == fInlineUploads.count());
SkASSERT(currMeshIdx == fMeshes.count());
fQueuedDraws.reset();
fInlineUploads.reset();
}
//////////////////////////////////////////////////////////////////////////////
void GrVertexBatch::Target::draw(const GrGeometryProcessor* gp, const GrMesh& mesh) {
GrVertexBatch* batch = this->vertexBatch();
batch->fMeshes.push_back(mesh);
if (!batch->fQueuedDraws.empty()) {
// If the last draw shares a geometry processor and there are no intervening uploads,
// add this mesh to it.
GrVertexBatch::QueuedDraw& lastDraw = this->vertexBatch()->fQueuedDraws.back();
if (lastDraw.fGeometryProcessor == gp &&
(batch->fInlineUploads.empty() ||
batch->fInlineUploads.back().fUploadBeforeToken != this->nextDrawToken())) {
++lastDraw.fMeshCnt;
return;
}
}
GrVertexBatch::QueuedDraw& draw = this->vertexBatch()->fQueuedDraws.push_back();
GrBatchDrawToken token = this->state()->issueDrawToken();
draw.fGeometryProcessor.reset(gp);
draw.fMeshCnt = 1;
if (batch->fQueuedDraws.count() == 1) {
batch->fBaseDrawToken = token;
}
}
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