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comparison: gfx/skia/trunk/src/gpu/GrGeometryBuffer.h
gfx/skia/trunk/src/gpu/GrGeometryBuffer.h
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- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:ec9307e9d549 |
|---|---|
| 1 | |
| 2 /* | |
| 3 * Copyright 2011 Google Inc. | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 | |
| 9 | |
| 10 #ifndef GrGeometryBuffer_DEFINED | |
| 11 #define GrGeometryBuffer_DEFINED | |
| 12 | |
| 13 #include "GrResource.h" | |
| 14 | |
| 15 class GrGpu; | |
| 16 | |
| 17 /** | |
| 18 * Parent class for vertex and index buffers | |
| 19 */ | |
| 20 class GrGeometryBuffer : public GrResource { | |
| 21 public: | |
| 22 SK_DECLARE_INST_COUNT(GrGeometryBuffer); | |
| 23 | |
| 24 /** | |
| 25 *Retrieves whether the buffer was created with the dynamic flag | |
| 26 * | |
| 27 * @return true if the buffer was created with the dynamic flag | |
| 28 */ | |
| 29 bool dynamic() const { return fDynamic; } | |
| 30 | |
| 31 /** | |
| 32 * Returns true if the buffer is a wrapper around a CPU array. If true it | |
| 33 * indicates that lock will always succeed and will be free. | |
| 34 */ | |
| 35 bool isCPUBacked() const { return fCPUBacked; } | |
| 36 | |
| 37 /** | |
| 38 * Locks the buffer to be written by the CPU. | |
| 39 * | |
| 40 * The previous content of the buffer is invalidated. It is an error | |
| 41 * to draw from the buffer while it is locked. It is an error to call lock | |
| 42 * on an already locked buffer. It may fail if the backend doesn't support | |
| 43 * locking the buffer. If the buffer is CPU backed then it will always | |
| 44 * succeed and is a free operation. Must be matched by an unlock() call. | |
| 45 * Currently only one lock at a time is supported (no nesting of | |
| 46 * lock/unlock). | |
| 47 * | |
| 48 * @return a pointer to the data or NULL if the lock fails. | |
| 49 */ | |
| 50 virtual void* lock() = 0; | |
| 51 | |
| 52 /** | |
| 53 * Returns the same ptr that lock() returned at time of lock or NULL if the | |
| 54 * is not locked. | |
| 55 * | |
| 56 * @return ptr to locked buffer data or undefined if buffer is not locked. | |
| 57 */ | |
| 58 virtual void* lockPtr() const = 0; | |
| 59 | |
| 60 /** | |
| 61 * Unlocks the buffer. | |
| 62 * | |
| 63 * The pointer returned by the previous lock call will no longer be valid. | |
| 64 */ | |
| 65 virtual void unlock() = 0; | |
| 66 | |
| 67 /** | |
| 68 Queries whether the buffer has been locked. | |
| 69 | |
| 70 @return true if the buffer is locked, false otherwise. | |
| 71 */ | |
| 72 virtual bool isLocked() const = 0; | |
| 73 | |
| 74 /** | |
| 75 * Updates the buffer data. | |
| 76 * | |
| 77 * The size of the buffer will be preserved. The src data will be | |
| 78 * placed at the beginning of the buffer and any remaining contents will | |
| 79 * be undefined. | |
| 80 * | |
| 81 * @return returns true if the update succeeds, false otherwise. | |
| 82 */ | |
| 83 virtual bool updateData(const void* src, size_t srcSizeInBytes) = 0; | |
| 84 | |
| 85 // GrResource overrides | |
| 86 virtual size_t sizeInBytes() const { return fSizeInBytes; } | |
| 87 | |
| 88 protected: | |
| 89 GrGeometryBuffer(GrGpu* gpu, bool isWrapped, size_t sizeInBytes, bool dynamic, bool cpuBacked) | |
| 90 : INHERITED(gpu, isWrapped) | |
| 91 , fSizeInBytes(sizeInBytes) | |
| 92 , fDynamic(dynamic) | |
| 93 , fCPUBacked(cpuBacked) {} | |
| 94 | |
| 95 private: | |
| 96 size_t fSizeInBytes; | |
| 97 bool fDynamic; | |
| 98 bool fCPUBacked; | |
| 99 | |
| 100 typedef GrResource INHERITED; | |
| 101 }; | |
| 102 | |
| 103 #endif |
