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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 GrMeshDrawOp_DEFINED
#define GrMeshDrawOp_DEFINED
#include "GrDrawOp.h"
#include "GrGeometryProcessor.h"
#include "GrMesh.h"
#include "GrPendingProgramElement.h"
#include "SkTLList.h"
class GrCaps;
class GrOpFlushState;
/**
* Base class for mesh-drawing GrDrawOps.
*/
class GrMeshDrawOp : public GrDrawOp {
public:
/** Abstract interface that represents a destination for a GrMeshDrawOp. */
class Target;
protected:
GrMeshDrawOp(uint32_t classID);
/** Helper for rendering repeating meshes using a patterned index buffer. This class creates the
space for the vertices and flushes the draws to the GrMeshDrawOp::Target. */
class PatternHelper {
public:
PatternHelper(GrPrimitiveType primitiveType) : fMesh(primitiveType) {}
/** Returns the allocated storage for the vertices. The caller should populate the vertices
before calling recordDraws(). */
void* init(Target*, size_t vertexStride, const GrBuffer*, int verticesPerRepetition,
int indicesPerRepetition, int repeatCount);
/** Call after init() to issue draws to the GrMeshDrawOp::Target.*/
void recordDraw(Target*, const GrGeometryProcessor*, const GrPipeline*);
private:
GrMesh fMesh;
};
static const int kVerticesPerQuad = 4;
static const int kIndicesPerQuad = 6;
/** A specialization of InstanceHelper for quad rendering. */
class QuadHelper : private PatternHelper {
public:
QuadHelper() : INHERITED(GrPrimitiveType::kTriangles) {}
/** Finds the cached quad index buffer and reserves vertex space. Returns nullptr on failure
and on success a pointer to the vertex data that the caller should populate before
calling recordDraws(). */
void* init(Target*, size_t vertexStride, int quadsToDraw);
using PatternHelper::recordDraw;
private:
typedef PatternHelper INHERITED;
};
private:
void onPrepare(GrOpFlushState* state) final;
void onExecute(GrOpFlushState* state) final;
virtual void onPrepareDraws(Target*) = 0;
typedef GrDrawOp INHERITED;
};
class GrMeshDrawOp::Target {
public:
virtual ~Target() {}
/** Adds a draw of a mesh. */
virtual void draw(const GrGeometryProcessor*, const GrPipeline*, const GrMesh&) = 0;
/**
* Makes space for vertex data. The returned pointer is the location where vertex data
* should be written. On return the buffer that will hold the data as well as an offset into
* the buffer (in 'vertexSize' units) where the data will be placed.
*/
virtual void* makeVertexSpace(size_t vertexSize, int vertexCount, const GrBuffer**,
int* startVertex) = 0;
/**
* Makes space for index data. The returned pointer is the location where index data
* should be written. On return the buffer that will hold the data as well as an offset into
* the buffer (in uint16_t units) where the data will be placed.
*/
virtual uint16_t* makeIndexSpace(int indexCount, const GrBuffer**, int* startIndex) = 0;
/**
* This is similar to makeVertexSpace. It allows the caller to use up to 'actualVertexCount'
* vertices in the returned pointer, which may exceed 'minVertexCount'.
* 'fallbackVertexCount' is the maximum number of vertices that should be allocated if a new
* buffer is allocated on behalf of this request.
*/
virtual void* makeVertexSpaceAtLeast(size_t vertexSize, int minVertexCount,
int fallbackVertexCount, const GrBuffer**,
int* startVertex, int* actualVertexCount) = 0;
/**
* This is similar to makeIndexSpace. It allows the caller to use up to 'actualIndexCount'
* indices in the returned pointer, which may exceed 'minIndexCount'.
* 'fallbackIndexCount' is the maximum number of indices that should be allocated if a new
* buffer is allocated on behalf of this request.
*/
virtual uint16_t* makeIndexSpaceAtLeast(int minIndexCount, int fallbackIndexCount,
const GrBuffer**, int* startIndex,
int* actualIndexCount) = 0;
/** Helpers for ops which over-allocate and then return excess data to the pool. */
virtual void putBackIndices(int indices) = 0;
virtual void putBackVertices(int vertices, size_t vertexStride) = 0;
/**
* Allocate space for a pipeline. The target ensures this pipeline lifetime is at least
* as long as any deferred execution of draws added via draw().
* @tparam Args
* @param args
* @return
*/
template <typename... Args>
GrPipeline* allocPipeline(Args&&... args) {
return this->pipelineArena()->make<GrPipeline>(std::forward<Args>(args)...);
}
/**
* Helper that makes a pipeline targeting the op's render target that incorporates the op's
* GrAppliedClip.
*/
GrPipeline* makePipeline(uint32_t pipelineFlags, GrProcessorSet&& processorSet,
GrAppliedClip&& clip) {
GrPipeline::InitArgs pipelineArgs;
pipelineArgs.fFlags = pipelineFlags;
pipelineArgs.fProxy = this->proxy();
pipelineArgs.fDstProxy = this->dstProxy();
pipelineArgs.fCaps = &this->caps();
pipelineArgs.fResourceProvider = this->resourceProvider();
return this->allocPipeline(pipelineArgs, std::move(processorSet), std::move(clip));
}
virtual GrRenderTargetProxy* proxy() const = 0;
virtual GrAppliedClip detachAppliedClip() = 0;
virtual const GrXferProcessor::DstProxy& dstProxy() const = 0;
virtual GrResourceProvider* resourceProvider() const = 0;
virtual const GrCaps& caps() const = 0;
virtual GrDeferredUploadTarget* deferredUploadTarget() = 0;
private:
virtual SkArenaAlloc* pipelineArena() = 0;
};
#endif
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