1 /* 2 * Copyright 2015 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef GrResourceProvider_DEFINED 9 #define GrResourceProvider_DEFINED 10 11 #include "GrTextureProvider.h" 12 13 class GrIndexBuffer; 14 class GrVertexBuffer; 15 16 /** 17 * An extension of the texture provider for arbitrary resource types. This class is intended for 18 * use within the Gr code base, not by clients or extensions (e.g. third party GrProcessor 19 * derivatives). 20 */ 21 class GrResourceProvider : public GrTextureProvider { 22 public: 23 24 GrResourceProvider(GrGpu* gpu, GrResourceCache* cache); 25 findAndRefTByUniqueKey(const GrUniqueKey & key)26 template <typename T> T* findAndRefTByUniqueKey(const GrUniqueKey& key) { 27 return static_cast<T*>(this->findAndRefResourceByUniqueKey(key)); 28 } 29 30 /** 31 * Either finds and refs, or creates an index buffer for instanced drawing with a specific 32 * pattern if the index buffer is not found. If the return is non-null, the caller owns 33 * a ref on the returned GrIndexBuffer. 34 * 35 * @param pattern the pattern of indices to repeat 36 * @param patternSize size in bytes of the pattern 37 * @param reps number of times to repeat the pattern 38 * @param vertCount number of vertices the pattern references 39 * @param key Key to be assigned to the index buffer. 40 * 41 * @return The index buffer if successful, otherwise NULL. 42 */ refOrCreateInstancedIndexBuffer(const uint16_t * pattern,int patternSize,int reps,int vertCount,const GrUniqueKey & key)43 const GrIndexBuffer* refOrCreateInstancedIndexBuffer(const uint16_t* pattern, 44 int patternSize, 45 int reps, 46 int vertCount, 47 const GrUniqueKey& key) { 48 if (GrIndexBuffer* buffer = this->findAndRefTByUniqueKey<GrIndexBuffer>(key)) { 49 return buffer; 50 } 51 return this->createInstancedIndexBuffer(pattern, patternSize, reps, vertCount, key); 52 } 53 54 /** 55 * Returns an index buffer that can be used to render quads. 56 * Six indices per quad: 0, 1, 2, 0, 2, 3, etc. 57 * The max number of quads can be queried using GrIndexBuffer::maxQuads(). 58 * Draw with kTriangles_GrPrimitiveType 59 * @ return the quad index buffer 60 */ refQuadIndexBuffer()61 const GrIndexBuffer* refQuadIndexBuffer() { 62 if (GrIndexBuffer* buffer = 63 this->findAndRefTByUniqueKey<GrIndexBuffer>(fQuadIndexBufferKey)) { 64 return buffer; 65 } 66 return this->createQuadIndexBuffer(); 67 } 68 69 70 using GrTextureProvider::assignUniqueKeyToResource; 71 using GrTextureProvider::findAndRefResourceByUniqueKey; 72 using GrTextureProvider::abandon; 73 74 private: 75 const GrIndexBuffer* createInstancedIndexBuffer(const uint16_t* pattern, 76 int patternSize, 77 int reps, 78 int vertCount, 79 const GrUniqueKey& key); 80 81 const GrIndexBuffer* createQuadIndexBuffer(); 82 83 GrUniqueKey fQuadIndexBufferKey; 84 85 typedef GrTextureProvider INHERITED; 86 }; 87 88 #endif 89