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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 GrResourceProvider_DEFINED
#define GrResourceProvider_DEFINED
#include "GrIndexBuffer.h"
#include "GrTextureProvider.h"
#include "GrPathRange.h"
class GrIndexBuffer;
class GrPath;
class GrStrokeInfo;
class GrVertexBuffer;
class SkDescriptor;
class SkPath;
class SkTypeface;
/**
* An extension of the texture provider for arbitrary resource types. This class is intended for
* use within the Gr code base, not by clients or extensions (e.g. third party GrProcessor
* derivatives).
*/
class GrResourceProvider : public GrTextureProvider {
public:
GrResourceProvider(GrGpu* gpu, GrResourceCache* cache);
template <typename T> T* findAndRefTByUniqueKey(const GrUniqueKey& key) {
return static_cast<T*>(this->findAndRefResourceByUniqueKey(key));
}
/**
* Either finds and refs, or creates an index buffer for instanced drawing with a specific
* pattern if the index buffer is not found. If the return is non-null, the caller owns
* a ref on the returned GrIndexBuffer.
*
* @param pattern the pattern of indices to repeat
* @param patternSize size in bytes of the pattern
* @param reps number of times to repeat the pattern
* @param vertCount number of vertices the pattern references
* @param key Key to be assigned to the index buffer.
*
* @return The index buffer if successful, otherwise NULL.
*/
const GrIndexBuffer* refOrCreateInstancedIndexBuffer(const uint16_t* pattern,
int patternSize,
int reps,
int vertCount,
const GrUniqueKey& key) {
if (GrIndexBuffer* buffer = this->findAndRefTByUniqueKey<GrIndexBuffer>(key)) {
return buffer;
}
return this->createInstancedIndexBuffer(pattern, patternSize, reps, vertCount, key);
}
/**
* Returns an index buffer that can be used to render quads.
* Six indices per quad: 0, 1, 2, 0, 2, 3, etc.
* The max number of quads can be queried using GrIndexBuffer::maxQuads().
* Draw with kTriangles_GrPrimitiveType
* @ return the quad index buffer
*/
const GrIndexBuffer* refQuadIndexBuffer() {
if (GrIndexBuffer* buffer =
this->findAndRefTByUniqueKey<GrIndexBuffer>(fQuadIndexBufferKey)) {
return buffer;
}
return this->createQuadIndexBuffer();
}
/**
* Factories for GrPath and GrPathRange objects. It's an error to call these if path rendering
* is not supported.
*/
GrPath* createPath(const SkPath&, const GrStrokeInfo&);
GrPathRange* createPathRange(GrPathRange::PathGenerator*, const GrStrokeInfo&);
GrPathRange* createGlyphs(const SkTypeface*, const SkDescriptor*, const GrStrokeInfo&);
using GrTextureProvider::assignUniqueKeyToResource;
using GrTextureProvider::findAndRefResourceByUniqueKey;
using GrTextureProvider::abandon;
GrIndexBuffer* getIndexBuffer(size_t size, bool dynamic, bool calledDuringFlush);
GrVertexBuffer* getVertexBuffer(size_t size, bool dynamic, bool calledDuringFlush);
private:
const GrIndexBuffer* createInstancedIndexBuffer(const uint16_t* pattern,
int patternSize,
int reps,
int vertCount,
const GrUniqueKey& key);
const GrIndexBuffer* createQuadIndexBuffer();
GrUniqueKey fQuadIndexBufferKey;
typedef GrTextureProvider INHERITED;
};
#endif
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