bsalomon | 371bcbc | 2014-12-01 08:19:34 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 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 GrFlushToGpuDrawTarget_DEFINED |
| 9 | #define GrFlushToGpuDrawTarget_DEFINED |
| 10 | |
| 11 | #include "GrDrawTarget.h" |
| 12 | |
| 13 | class GrIndexBufferAllocPool; |
| 14 | class GrVertexBufferAllocPool; |
| 15 | class GrGpu; |
| 16 | |
| 17 | /** |
| 18 | * Base class for draw targets that accumulate index and vertex data in buffers for deferred. |
| 19 | * When draw target clients reserve geometry this subclass will place that geometry into |
| 20 | * preallocated vertex/index buffers in the order the requests are made (assuming the requests fit |
| 21 | * in the preallocated buffers). |
| 22 | */ |
| 23 | class GrFlushToGpuDrawTarget : public GrClipTarget { |
| 24 | public: |
| 25 | GrFlushToGpuDrawTarget(GrGpu*, GrVertexBufferAllocPool*,GrIndexBufferAllocPool*); |
| 26 | |
| 27 | ~GrFlushToGpuDrawTarget() SK_OVERRIDE; |
| 28 | |
| 29 | /** |
| 30 | * Empties the draw buffer of any queued up draws. This must not be called while inside an |
| 31 | * unbalanced pushGeometrySource(). |
| 32 | */ |
| 33 | void reset(); |
| 34 | |
| 35 | /** |
| 36 | * This plays any queued up draws to its GrGpu target. It also resets this object (i.e. flushing |
| 37 | * is destructive). This buffer must not have an active reserved vertex or index source. Any |
| 38 | * reserved geometry on the target will be finalized because it's geometry source will be pushed |
| 39 | * before flushing and popped afterwards. |
| 40 | */ |
| 41 | void flush(); |
| 42 | |
| 43 | bool geometryHints(size_t vertexStride, int* vertexCount, int* indexCount) const SK_OVERRIDE; |
| 44 | |
| 45 | protected: |
| 46 | GrGpu* getGpu() { return fGpu; } |
| 47 | const GrGpu* getGpu() const{ return fGpu; } |
| 48 | |
| 49 | private: |
| 50 | enum { |
| 51 | kGeoPoolStatePreAllocCnt = 4, |
| 52 | }; |
| 53 | |
| 54 | struct GeometryPoolState { |
| 55 | const GrVertexBuffer* fPoolVertexBuffer; |
| 56 | int fPoolStartVertex; |
| 57 | const GrIndexBuffer* fPoolIndexBuffer; |
| 58 | int fPoolStartIndex; |
| 59 | // caller may conservatively over reserve vertices / indices. |
| 60 | // we release unused space back to allocator if possible |
| 61 | // can only do this if there isn't an intervening pushGeometrySource() |
| 62 | size_t fUsedPoolVertexBytes; |
| 63 | size_t fUsedPoolIndexBytes; |
| 64 | }; |
| 65 | |
| 66 | typedef SkSTArray<kGeoPoolStatePreAllocCnt, GeometryPoolState> GeoPoolStateStack; |
| 67 | |
| 68 | virtual void onReset() = 0; |
| 69 | |
| 70 | virtual void onFlush() = 0; |
| 71 | |
| 72 | void setDrawBuffers(DrawInfo*, size_t stride) SK_OVERRIDE; |
| 73 | bool onReserveVertexSpace(size_t vertexSize, int vertexCount, void** vertices) SK_OVERRIDE; |
| 74 | bool onReserveIndexSpace(int indexCount, void** indices) SK_OVERRIDE; |
| 75 | void releaseReservedVertexSpace() SK_OVERRIDE; |
| 76 | void releaseReservedIndexSpace() SK_OVERRIDE; |
| 77 | void geometrySourceWillPush() SK_OVERRIDE; |
| 78 | void geometrySourceWillPop(const GeometrySrcState& restoredState) SK_OVERRIDE; |
| 79 | void willReserveVertexAndIndexSpace(int vertexCount, |
| 80 | size_t vertexStride, |
| 81 | int indexCount) SK_OVERRIDE; |
bsalomon | eff2c72 | 2014-12-02 09:40:12 -0800 | [diff] [blame] | 82 | bool onCanCopySurface(const GrSurface* dst, |
| 83 | const GrSurface* src, |
| 84 | const SkIRect& srcRect, |
| 85 | const SkIPoint& dstPoint) SK_OVERRIDE; |
| 86 | bool onInitCopySurfaceDstDesc(const GrSurface* src, GrSurfaceDesc* desc) SK_OVERRIDE; |
bsalomon | 371bcbc | 2014-12-01 08:19:34 -0800 | [diff] [blame] | 87 | |
| 88 | GeoPoolStateStack fGeoPoolStateStack; |
| 89 | SkAutoTUnref<GrGpu> fGpu; |
| 90 | GrVertexBufferAllocPool* fVertexPool; |
| 91 | GrIndexBufferAllocPool* fIndexPool; |
| 92 | bool fFlushing; |
| 93 | |
| 94 | typedef GrClipTarget INHERITED; |
| 95 | }; |
| 96 | |
| 97 | #endif |