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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 GrStencilBuffer_DEFINED | |
11 #define GrStencilBuffer_DEFINED | |
12 | |
13 #include "GrClip.h" | |
14 #include "GrGpuResource.h" | |
15 | |
16 class GrRenderTarget; | |
17 class GrResourceKey; | |
18 | |
19 class GrStencilBuffer : public GrGpuResource { | |
20 public: | |
21 SK_DECLARE_INST_COUNT(GrStencilBuffer); | |
22 | |
23 virtual ~GrStencilBuffer() { | |
24 // TODO: allow SB to be purged and detach itself from rts | |
25 } | |
26 | |
27 int width() const { return fWidth; } | |
28 int height() const { return fHeight; } | |
29 int bits() const { return fBits; } | |
30 int numSamples() const { return fSampleCnt; } | |
31 | |
32 // called to note the last clip drawn to this buffer. | |
33 void setLastClip(int32_t clipStackGenID, | |
34 const SkIRect& clipSpaceRect, | |
35 const SkIPoint clipSpaceToStencilOffset) { | |
36 fLastClipStackGenID = clipStackGenID; | |
37 fLastClipStackRect = clipSpaceRect; | |
38 fLastClipSpaceOffset = clipSpaceToStencilOffset; | |
39 } | |
40 | |
41 // called to determine if we have to render the clip into SB. | |
42 bool mustRenderClip(int32_t clipStackGenID, | |
43 const SkIRect& clipSpaceRect, | |
44 const SkIPoint clipSpaceToStencilOffset) const { | |
45 return fLastClipStackGenID != clipStackGenID || | |
46 fLastClipSpaceOffset != clipSpaceToStencilOffset || | |
47 !fLastClipStackRect.contains(clipSpaceRect); | |
48 } | |
49 | |
50 // We create a unique stencil buffer at each width, height and sampleCnt and
share it for | |
51 // all render targets that require a stencil with those params. | |
52 static void ComputeSharedStencilBufferKey(int width, int height, int sampleC
nt, | |
53 GrUniqueKey* key); | |
54 | |
55 protected: | |
56 GrStencilBuffer(GrGpu* gpu, LifeCycle lifeCycle, int width, int height, int
bits, int sampleCnt) | |
57 : GrGpuResource(gpu, lifeCycle) | |
58 , fWidth(width) | |
59 , fHeight(height) | |
60 , fBits(bits) | |
61 , fSampleCnt(sampleCnt) | |
62 , fLastClipStackGenID(SkClipStack::kInvalidGenID) { | |
63 fLastClipStackRect.setEmpty(); | |
64 } | |
65 | |
66 private: | |
67 | |
68 int fWidth; | |
69 int fHeight; | |
70 int fBits; | |
71 int fSampleCnt; | |
72 | |
73 int32_t fLastClipStackGenID; | |
74 SkIRect fLastClipStackRect; | |
75 SkIPoint fLastClipSpaceOffset; | |
76 | |
77 typedef GrGpuResource INHERITED; | |
78 }; | |
79 | |
80 #endif | |
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