1 /* 2 * Copyright 2016 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 gr_instanced_InstanceProcessor_DEFINED 9 #define gr_instanced_InstanceProcessor_DEFINED 10 11 #include "GrCaps.h" 12 #include "GrGeometryProcessor.h" 13 #include "instanced/InstancedRenderingTypes.h" 14 15 namespace gr_instanced { 16 17 /** 18 * This class provides a GP implementation that uses instanced rendering. Is sends geometry in as 19 * basic, pre-baked canonical shapes, and uses instanced vertex attribs to control how these shapes 20 * are transformed and drawn. MSAA is accomplished with the sample mask rather than finely 21 * tesselated geometry. 22 */ 23 class InstanceProcessor : public GrGeometryProcessor { 24 public: 25 InstanceProcessor(OpInfo, GrBuffer* paramsBuffer); 26 27 const char* name() const override { return "Instance Processor"; } 28 OpInfo opInfo() const { return fOpInfo; } 29 30 void getGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder* b) const override { 31 b->add32(fOpInfo.fData); 32 } 33 GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const override; 34 35 /** 36 * Returns a buffer of ShapeVertex that defines the canonical instanced geometry. 37 */ 38 static const GrBuffer* SK_WARN_UNUSED_RESULT FindOrCreateVertexBuffer(GrGpu*); 39 40 /** 41 * Returns a buffer of 8-bit indices for the canonical instanced geometry. The client can call 42 * GetIndexRangeForXXX to know which indices to use for a specific shape. 43 */ 44 static const GrBuffer* SK_WARN_UNUSED_RESULT FindOrCreateIndex8Buffer(GrGpu*); 45 46 static IndexRange GetIndexRangeForRect(GrAAType); 47 static IndexRange GetIndexRangeForOval(GrAAType, const SkRect& devBounds); 48 static IndexRange GetIndexRangeForRRect(GrAAType); 49 50 static const char* GetNameOfIndexRange(IndexRange); 51 52 private: 53 /** 54 * Called by the platform-specific instanced rendering implementation to determine the level of 55 * support this class can offer on the given GLSL platform. 56 */ 57 static GrCaps::InstancedSupport CheckSupport(const GrShaderCaps&, const GrCaps&); 58 59 const OpInfo fOpInfo; 60 BufferAccess fParamsAccess; 61 62 friend class GLInstancedRendering; // For CheckSupport. 63 64 typedef GrGeometryProcessor INHERITED; 65 }; 66 67 } 68 69 #endif 70