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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.
*/
#ifndef GrBatchBuffer_DEFINED
#define GrBatchBuffer_DEFINED
#include "GrBufferAllocPool.h"
#include "GrGpu.h"
#include "batches/GrVertexBatch.h"
class GrGpuCommandBuffer;
class GrResourceProvider;
/** Tracks the state across all the GrBatches in a GrOpList flush. */
class GrBatchFlushState {
public:
GrBatchFlushState(GrGpu*, GrResourceProvider*);
~GrBatchFlushState() { this->reset(); }
/** Inserts an upload to be executed after all batches in the flush prepared their draws
but before the draws are executed to the backend 3D API. */
void addASAPUpload(GrDrawBatch::DeferredUploadFn&& upload) {
fAsapUploads.emplace_back(std::move(upload));
}
const GrCaps& caps() const { return *fGpu->caps(); }
GrResourceProvider* resourceProvider() const { return fResourceProvider; }
/** Has the token been flushed to the backend 3D API. */
bool hasDrawBeenFlushed(GrBatchDrawToken token) const {
return token.fSequenceNumber <= fLastFlushedToken.fSequenceNumber;
}
/** Issue a token to an operation that is being enqueued. */
GrBatchDrawToken issueDrawToken() {
return GrBatchDrawToken(++fLastIssuedToken.fSequenceNumber);
}
/** Call every time a draw that was issued a token is flushed */
void flushToken() { ++fLastFlushedToken.fSequenceNumber; }
/** Gets the next draw token that will be issued. */
GrBatchDrawToken nextDrawToken() const {
return GrBatchDrawToken(fLastIssuedToken.fSequenceNumber + 1);
}
/** The last token flushed to all the way to the backend API. */
GrBatchDrawToken nextTokenToFlush() const {
return GrBatchDrawToken(fLastFlushedToken.fSequenceNumber + 1);
}
void* makeVertexSpace(size_t vertexSize, int vertexCount,
const GrBuffer** buffer, int* startVertex);
uint16_t* makeIndexSpace(int indexCount, const GrBuffer** buffer, int* startIndex);
/** This is called after each batch has a chance to prepare its draws and before the draws
are issued. */
void preIssueDraws() {
fVertexPool.unmap();
fIndexPool.unmap();
int uploadCount = fAsapUploads.count();
for (int i = 0; i < uploadCount; i++) {
this->doUpload(fAsapUploads[i]);
}
fAsapUploads.reset();
}
void doUpload(GrDrawBatch::DeferredUploadFn& upload) {
GrDrawBatch::WritePixelsFn wp = [this] (GrSurface* surface,
int left, int top, int width, int height,
GrPixelConfig config, const void* buffer,
size_t rowBytes) -> bool {
return this->fGpu->writePixels(surface, left, top, width, height, config, buffer,
rowBytes);
};
upload(wp);
}
void putBackIndices(size_t indices) { fIndexPool.putBack(indices * sizeof(uint16_t)); }
void putBackVertexSpace(size_t sizeInBytes) { fVertexPool.putBack(sizeInBytes); }
GrGpuCommandBuffer* commandBuffer() { return fCommandBuffer; }
void setCommandBuffer(GrGpuCommandBuffer* buffer) { fCommandBuffer = buffer; }
GrGpu* gpu() { return fGpu; }
void reset() {
fVertexPool.reset();
fIndexPool.reset();
}
private:
GrGpu* fGpu;
GrResourceProvider* fResourceProvider;
GrGpuCommandBuffer* fCommandBuffer;
GrVertexBufferAllocPool fVertexPool;
GrIndexBufferAllocPool fIndexPool;
SkSTArray<4, GrDrawBatch::DeferredUploadFn> fAsapUploads;
GrBatchDrawToken fLastIssuedToken;
GrBatchDrawToken fLastFlushedToken;
};
/**
* A word about uploads and tokens: Batches should usually schedule their uploads to occur at the
* begining of a frame whenever possible. These are called ASAP uploads. Of course, this requires
* that there are no draws that have yet to be flushed that rely on the old texture contents. In
* that case the ASAP upload would happen prior to the previous draw causing the draw to read the
* new (wrong) texture data. In that case they should schedule an inline upload.
*
* Batches, in conjunction with helpers such as GrBatchAtlas, can use the token system to know
* what the most recent draw was that referenced a resource (or portion of a resource). Each draw
* is assigned a token. A resource (or portion) can be tagged with the most recent draw's
* token. The target provides a facility for testing whether the draw corresponding to the token
* has been flushed. If it has not been flushed then the batch must perform an inline upload
* instead. When scheduling an inline upload the batch provides the token of the draw that the
* upload must occur before. The upload will then occur between the draw that requires the new
* data but after the token that requires the old data.
*
* TODO: Currently the token/upload interface is spread over GrDrawBatch, GrVertexBatch,
* GrDrawBatch::Target, and GrVertexBatch::Target. However, the interface at the GrDrawBatch
* level is not complete and isn't useful. We should push it down to GrVertexBatch until it
* is required at the GrDrawBatch level.
*/
/**
* GrDrawBatch instances use this object to allocate space for their geometry and to issue the draws
* that render their batch.
*/
class GrDrawBatch::Target {
public:
Target(GrBatchFlushState* state, GrDrawBatch* batch) : fState(state), fBatch(batch) {}
/** Returns the token of the draw that this upload will occur before. */
GrBatchDrawToken addInlineUpload(DeferredUploadFn&& upload) {
fBatch->fInlineUploads.emplace_back(std::move(upload), fState->nextDrawToken());
return fBatch->fInlineUploads.back().fUploadBeforeToken;
}
/** Returns the token of the draw that this upload will occur before. Since ASAP uploads
are done first during a flush, this will be the first token since the most recent
flush. */
GrBatchDrawToken addAsapUpload(DeferredUploadFn&& upload) {
fState->addASAPUpload(std::move(upload));
return fState->nextTokenToFlush();
}
bool hasDrawBeenFlushed(GrBatchDrawToken token) const {
return fState->hasDrawBeenFlushed(token);
}
/** Gets the next draw token that will be issued by this target. This can be used by a batch
to record that the next draw it issues will use a resource (e.g. texture) while preparing
that draw. */
GrBatchDrawToken nextDrawToken() const { return fState->nextDrawToken(); }
const GrCaps& caps() const { return fState->caps(); }
GrResourceProvider* resourceProvider() const { return fState->resourceProvider(); }
protected:
GrDrawBatch* batch() { return fBatch; }
GrBatchFlushState* state() { return fState; }
private:
GrBatchFlushState* fState;
GrDrawBatch* fBatch;
};
/** Extension of GrDrawBatch::Target for use by GrVertexBatch. Adds the ability to create vertex
draws. */
class GrVertexBatch::Target : public GrDrawBatch::Target {
public:
Target(GrBatchFlushState* state, GrVertexBatch* batch) : INHERITED(state, batch) {}
void draw(const GrGeometryProcessor* gp, const GrMesh& mesh);
void* makeVertexSpace(size_t vertexSize, int vertexCount,
const GrBuffer** buffer, int* startVertex) {
return this->state()->makeVertexSpace(vertexSize, vertexCount, buffer, startVertex);
}
uint16_t* makeIndexSpace(int indexCount, const GrBuffer** buffer, int* startIndex) {
return this->state()->makeIndexSpace(indexCount, buffer, startIndex);
}
/** Helpers for batches which over-allocate and then return data to the pool. */
void putBackIndices(int indices) { this->state()->putBackIndices(indices); }
void putBackVertices(int vertices, size_t vertexStride) {
this->state()->putBackVertexSpace(vertices * vertexStride);
}
private:
GrVertexBatch* vertexBatch() { return static_cast<GrVertexBatch*>(this->batch()); }
typedef GrDrawBatch::Target INHERITED;
};
#endif
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