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1 | |
2 /* | |
3 * Copyright 2015 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 GrTransferBuffer_DEFINED | |
11 #define GrTransferBuffer_DEFINED | |
12 | |
13 #include "GrGpuResource.h" | |
14 | |
15 class GrTransferBuffer : public GrGpuResource { | |
16 public: | |
17 /** | |
18 * Maps the buffer to be written by the CPU. | |
19 * | |
20 * The previous content of the buffer is invalidated. It is an error | |
21 * to transfer to or from the buffer while it is mapped. It is an error to | |
22 * call map on an already mapped buffer. Must be matched by an unmap() call. | |
23 * Currently only one map at a time is supported (no nesting of map/unmap). | |
24 * | |
25 * Note that buffer mapping does not go through GrContext and therefore is | |
26 * not serialized with other operations. | |
27 * | |
28 * @return a pointer to the data or nullptr if the map fails. | |
29 */ | |
30 void* map() { return (fMapPtr = this->onMap()); } | |
31 | |
32 /** | |
33 * Unmaps the buffer. | |
34 * | |
35 * The pointer returned by the previous map call will no longer be valid. | |
36 */ | |
37 void unmap() { | |
38 SkASSERT(fMapPtr); | |
39 this->onUnmap(); | |
40 fMapPtr = nullptr; | |
41 } | |
42 | |
43 /** | |
44 * Returns the same ptr that map() returned at time of map or nullptr if the | |
45 * is not mapped. | |
46 * | |
47 * @return ptr to mapped buffer data or nullptr if buffer is not mapped. | |
48 */ | |
49 void* mapPtr() const { return fMapPtr; } | |
50 | |
51 /** | |
52 Queries whether the buffer has been mapped. | |
53 | |
54 @return true if the buffer is mapped, false otherwise. | |
55 */ | |
56 bool isMapped() const { return SkToBool(fMapPtr); } | |
57 | |
58 protected: | |
59 GrTransferBuffer(GrGpu* gpu, size_t gpuMemorySize) | |
60 : INHERITED(gpu, kUncached_LifeCycle) | |
61 , fGpuMemorySize(gpuMemorySize) { | |
62 } | |
63 | |
64 private: | |
65 virtual size_t onGpuMemorySize() const { return fGpuMemorySize; } | |
66 | |
67 virtual void* onMap() = 0; | |
68 virtual void onUnmap() = 0; | |
69 | |
70 void* fMapPtr; | |
71 size_t fGpuMemorySize; | |
72 | |
73 typedef GrGpuResource INHERITED; | |
74 }; | |
75 | |
76 #endif | |
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