1 /* 2 * Copyright 2013 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 GrGLProgramDesc_DEFINED 9 #define GrGLProgramDesc_DEFINED 10 11 #include "GrColor.h" 12 #include "GrProgramDesc.h" 13 #include "GrGpu.h" 14 #include "GrTypesPriv.h" 15 16 class GrGLGpu; 17 class GrGLProgramDescBuilder; 18 19 class GrGLProgramDesc : public GrProgramDesc { 20 friend class GrGLProgramDescBuilder; 21 }; 22 23 /** 24 * This class can be used to build a GrProgramDesc. It also provides helpers for accessing 25 * GL specific info in the header. 26 */ 27 class GrGLProgramDescBuilder { 28 public: 29 typedef GrProgramDesc::KeyHeader KeyHeader; 30 // The key, stored in fKey, is composed of five parts(first 2 are defined in the key itself): 31 // 1. uint32_t for total key length. 32 // 2. uint32_t for a checksum. 33 // 3. Header struct defined above. 34 // 4. Backend-specific information including per-processor keys and their key lengths. 35 // Each processor's key is a variable length array of uint32_t. 36 enum { 37 // Part 3. 38 kHeaderOffset = GrGLProgramDesc::kHeaderOffset, 39 kHeaderSize = SkAlign4(sizeof(KeyHeader)), 40 // Part 4. 41 // This is the offset into the backenend specific part of the key, which includes 42 // per-processor keys. 43 kProcessorKeysOffset = kHeaderOffset + kHeaderSize, 44 }; 45 46 /** 47 * Builds a GL specific program descriptor 48 * 49 * @param GrPrimitiveProcessor The geometry 50 * @param GrPipeline The optimized drawstate. The descriptor will represent a program 51 * which this optstate can use to draw with. The optstate contains 52 * general draw information, as well as the specific color, geometry, 53 * and coverage stages which will be used to generate the GL Program for 54 * this optstate. 55 * @param GrGLGpu A GL Gpu, the caps and Gpu object are used to output processor specific 56 * parts of the descriptor. 57 * @param GrDeviceCoordTexture A dstCopy texture, which may be null if frame buffer fetch is 58 * supported 59 * @param GrProgramDesc The built and finalized descriptor 60 **/ 61 static bool Build(GrProgramDesc*, 62 const GrPrimitiveProcessor&, 63 const GrPipeline&, 64 const GrGLGpu*, 65 const GrBatchTracker&); 66 }; 67 68 #endif 69
