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1 /* | 1 /* |
2 * Copyright 2011 Google Inc. | 2 * Copyright 2011 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef GrRenderTarget_DEFINED | 8 #ifndef GrRenderTarget_DEFINED |
9 #define GrRenderTarget_DEFINED | 9 #define GrRenderTarget_DEFINED |
10 | 10 |
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24 class GrRenderTarget : virtual public GrSurface { | 24 class GrRenderTarget : virtual public GrSurface { |
25 public: | 25 public: |
26 SK_DECLARE_INST_COUNT(GrRenderTarget) | 26 SK_DECLARE_INST_COUNT(GrRenderTarget) |
27 | 27 |
28 // GrSurface overrides | 28 // GrSurface overrides |
29 GrRenderTarget* asRenderTarget() override { return this; } | 29 GrRenderTarget* asRenderTarget() override { return this; } |
30 const GrRenderTarget* asRenderTarget() const override { return this; } | 30 const GrRenderTarget* asRenderTarget() const override { return this; } |
31 | 31 |
32 // GrRenderTarget | 32 // GrRenderTarget |
33 /** | 33 /** |
34 * @return true if the surface is multisampled, false otherwise | 34 * On some hardware it is possible for a render target to have multisampling |
35 */ | 35 * only in certain buffers. |
36 bool isMultisampled() const { return 0 != fDesc.fSampleCnt; } | 36 * Enforce only two legal sample configs. |
| 37 * kUnified_SampleConfig signifies multisampling in both color and stencil |
| 38 * buffers and is available across all hardware. |
| 39 * kStencil_SampleConfig means multisampling is present in stencil buffer |
| 40 * only; this config requires hardware support of |
| 41 * NV_framebuffer_mixed_samples. |
| 42 */ |
| 43 enum SampleConfig { |
| 44 kUnified_SampleConfig = 0, |
| 45 kStencil_SampleConfig = 1 |
| 46 }; |
37 | 47 |
38 /** | 48 /** |
39 * @return the number of samples-per-pixel or zero if non-MSAA. | 49 * @return true if the surface is multisampled in all buffers, |
| 50 * false otherwise |
40 */ | 51 */ |
41 int numSamples() const { return fDesc.fSampleCnt; } | 52 bool isUnifiedMultisampled() const { |
| 53 if (fSampleConfig != kUnified_SampleConfig) { |
| 54 return false; |
| 55 } |
| 56 return 0 != fDesc.fSampleCnt; |
| 57 } |
| 58 |
| 59 /** |
| 60 * @return true if the surface is multisampled in the stencil buffer, |
| 61 * false otherwise |
| 62 */ |
| 63 bool isStencilBufferMultisampled() const { |
| 64 return 0 != fDesc.fSampleCnt; |
| 65 } |
| 66 |
| 67 /** |
| 68 * @return the number of color samples-per-pixel, or zero if non-MSAA or |
| 69 * multisampled in the stencil buffer only. |
| 70 */ |
| 71 int numColorSamples() const { |
| 72 if (fSampleConfig == kUnified_SampleConfig) { |
| 73 return fDesc.fSampleCnt; |
| 74 } |
| 75 return 0; |
| 76 } |
| 77 |
| 78 /** |
| 79 * @return the number of stencil samples-per-pixel, or zero if non-MSAA. |
| 80 */ |
| 81 int numStencilSamples() const { |
| 82 return fDesc.fSampleCnt; |
| 83 } |
| 84 |
| 85 /** |
| 86 * @return true if the surface is mixed sampled, false otherwise. |
| 87 */ |
| 88 bool hasMixedSamples() const { |
| 89 SkASSERT(kStencil_SampleConfig != fSampleConfig || |
| 90 this->isStencilBufferMultisampled()); |
| 91 return kStencil_SampleConfig == fSampleConfig; |
| 92 } |
42 | 93 |
43 /** | 94 /** |
44 * Call to indicate the multisample contents were modified such that the | 95 * Call to indicate the multisample contents were modified such that the |
45 * render target needs to be resolved before it can be used as texture. Gr | 96 * render target needs to be resolved before it can be used as texture. Gr |
46 * tracks this for its own drawing and thus this only needs to be called | 97 * tracks this for its own drawing and thus this only needs to be called |
47 * when the render target has been modified outside of Gr. This has no | 98 * when the render target has been modified outside of Gr. This has no |
48 * effect on wrapped backend render targets. | 99 * effect on wrapped backend render targets. |
49 * | 100 * |
50 * @param rect a rect bounding the area needing resolve. NULL indicates | 101 * @param rect a rect bounding the area needing resolve. NULL indicates |
51 * the whole RT needs resolving. | 102 * the whole RT needs resolving. |
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87 kAutoResolves_ResolveType, | 138 kAutoResolves_ResolveType, |
88 kCantResolve_ResolveType, | 139 kCantResolve_ResolveType, |
89 }; | 140 }; |
90 virtual ResolveType getResolveType() const = 0; | 141 virtual ResolveType getResolveType() const = 0; |
91 | 142 |
92 // Provides access to functions that aren't part of the public API. | 143 // Provides access to functions that aren't part of the public API. |
93 GrRenderTargetPriv renderTargetPriv(); | 144 GrRenderTargetPriv renderTargetPriv(); |
94 const GrRenderTargetPriv renderTargetPriv() const; | 145 const GrRenderTargetPriv renderTargetPriv() const; |
95 | 146 |
96 protected: | 147 protected: |
97 GrRenderTarget(GrGpu* gpu, LifeCycle lifeCycle, const GrSurfaceDesc& desc) | 148 GrRenderTarget(GrGpu* gpu, LifeCycle lifeCycle, const GrSurfaceDesc& desc, |
| 149 SampleConfig sampleConfig) |
98 : INHERITED(gpu, lifeCycle, desc) | 150 : INHERITED(gpu, lifeCycle, desc) |
99 , fStencilAttachment(NULL) { | 151 , fStencilAttachment(NULL) |
| 152 , fSampleConfig(sampleConfig) { |
100 fResolveRect.setLargestInverted(); | 153 fResolveRect.setLargestInverted(); |
101 } | 154 } |
102 | 155 |
103 // override of GrResource | 156 // override of GrResource |
104 void onAbandon() override; | 157 void onAbandon() override; |
105 void onRelease() override; | 158 void onRelease() override; |
106 | 159 |
107 private: | 160 private: |
108 // Checked when this object is asked to attach a stencil buffer. | 161 // Checked when this object is asked to attach a stencil buffer. |
109 virtual bool canAttemptStencilAttachment() const = 0; | 162 virtual bool canAttemptStencilAttachment() const = 0; |
110 | 163 |
111 friend class GrRenderTargetPriv; | 164 friend class GrRenderTargetPriv; |
112 | 165 |
113 GrStencilAttachment* fStencilAttachment; | 166 GrStencilAttachment* fStencilAttachment; |
| 167 SampleConfig fSampleConfig; |
114 | 168 |
115 SkIRect fResolveRect; | 169 SkIRect fResolveRect; |
116 | 170 |
117 typedef GrSurface INHERITED; | 171 typedef GrSurface INHERITED; |
118 }; | 172 }; |
119 | 173 |
| 174 |
120 #endif | 175 #endif |
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