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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 | 8 |
9 #ifndef GrGLRenderTarget_DEFINED | 9 #ifndef GrGLRenderTarget_DEFINED |
10 #define GrGLRenderTarget_DEFINED | 10 #define GrGLRenderTarget_DEFINED |
11 | 11 |
12 #include "GrGLIRect.h" | 12 #include "GrGLIRect.h" |
13 #include "GrRenderTarget.h" | 13 #include "GrRenderTarget.h" |
14 #include "SkScalar.h" | 14 #include "SkScalar.h" |
15 | 15 |
16 class GrGLGpu; | 16 class GrGLGpu; |
17 | 17 |
18 /** Represents a GL FBO object. It has a gen ID which is valid whenever the FBO ID owned by the | |
19 object is valid. The gen IDs are not recycled after FBOs are freed, unlike F BO IDs, and so | |
20 can be used to uniquely identity FBO ID instantiations. If this object owns an FBO ID, the ID | |
21 must be deleted or abandoned before this object is freed. FBO IDs should nev er be owned by | |
egdaniel
2015/02/25 16:21:34
"FBO IDs should never be owned by more that one in
| |
22 more than one instance. */ | |
23 class GrGLFBO : public SkRefCnt { | |
24 public: | |
25 SK_DECLARE_INST_COUNT(GrGLFBO); | |
26 | |
27 /** Initializes to invalid state */ | |
28 GrGLFBO() : fGenID(SK_InvalidGenID) {} | |
29 | |
30 /** Initializes to an FBO. */ | |
31 GrGLFBO(GrGLint id) : fID(id), fGenID(NextGenID()) {} | |
32 | |
33 /** Initializes to an FBO. */ | |
34 GrGLFBO(const GrGLInterface* gl) { | |
35 GR_GL_CALL(gl, GenFramebuffers(1, &fID)); | |
36 if (0 != fID) { | |
37 fGenID = NextGenID(); | |
38 } else { | |
39 fGenID = SK_InvalidGenID; | |
40 } | |
41 } | |
42 | |
43 ~GrGLFBO() SK_OVERRIDE { SkASSERT(!this->isValid()); } | |
44 | |
45 /** If this does not own a FBO ID, attempt to create one. Otherwise, no-op. */ | |
46 void generateIfInvalid(const GrGLInterface* gl) { | |
egdaniel
2015/02/25 16:21:34
I wonder if this should be public. I feel like it
| |
47 if (!this->isValid()) { | |
48 GR_GL_CALL(gl, GenFramebuffers(1, &fID)); | |
49 if (fID) { | |
50 fGenID = NextGenID(); | |
51 } | |
52 } | |
53 } | |
54 | |
55 /** Does this object own an FBO ID? */ | |
56 bool isValid() const { return SK_InvalidGenID != fGenID; } | |
57 | |
58 uint32_t genID() const { return fGenID; } | |
59 | |
60 GrGLint fboID() const { SkASSERT(this->isValid()); return fID; } | |
61 | |
62 bool isDefaultFramebuffer() const { SkASSERT(this->isValid()); return 0 == f ID; } | |
63 | |
64 /** Give up ownership of the FBO ID owned by this object without deleting it . */ | |
65 void abandon(GrGLGpu* gpu); | |
66 | |
67 /** Delete and give up ownership of the the FBO ID if it is valid. */ | |
68 void deleteIfValid(GrGLGpu* gpu); | |
69 | |
70 private: | |
71 static uint32_t NextGenID() { | |
72 static int32_t gGenID = SK_InvalidGenID + 1; | |
73 return static_cast<uint32_t>(sk_atomic_inc(&gGenID)); | |
74 } | |
75 | |
76 GrGLuint fID; | |
77 uint32_t fGenID; | |
78 | |
79 typedef SkRefCnt INHERITED; | |
80 }; | |
81 | |
82 ////////////////////////////////////////////////////////////////////////////// | |
83 | |
84 /** GL-specific subclass of GrRenderTarget. */ | |
18 class GrGLRenderTarget : public GrRenderTarget { | 85 class GrGLRenderTarget : public GrRenderTarget { |
19 public: | 86 public: |
20 // set fTexFBOID to this value to indicate that it is multisampled but | |
21 // Gr doesn't know how to resolve it. | |
22 enum { kUnresolvableFBOID = 0 }; | |
23 | |
24 struct IDDesc { | 87 struct IDDesc { |
25 GrGLuint fRTFBOID; | 88 SkAutoTUnref<GrGLFBO> fRenderFBO; |
26 GrGLuint fTexFBOID; | 89 SkAutoTUnref<GrGLFBO> fTextureFBO; |
27 GrGLuint fMSColorRenderbufferID; | 90 GrGLuint fMSColorRenderbufferID; |
28 GrGpuResource::LifeCycle fLifeCycle; | 91 GrGpuResource::LifeCycle fLifeCycle; |
29 }; | 92 }; |
30 | 93 |
31 GrGLRenderTarget(GrGLGpu*, const GrSurfaceDesc&, const IDDesc&); | 94 GrGLRenderTarget(GrGLGpu*, const GrSurfaceDesc&, const IDDesc&); |
32 | 95 |
33 void setViewport(const GrGLIRect& rect) { fViewport = rect; } | 96 void setViewport(const GrGLIRect& rect) { fViewport = rect; } |
34 const GrGLIRect& getViewport() const { return fViewport; } | 97 const GrGLIRect& getViewport() const { return fViewport; } |
35 | 98 |
36 // The following two functions return the same ID when a | 99 // For multisampled renderbuffer render targets, these will return different GrGLFBO objects. If |
37 // texture/render target is multisampled, and different IDs when | 100 // the render target is not texturable, textureFBO() returns NULL. If the re nder target auto |
38 // it is. | 101 // resolves to a texture, the same object is returned. |
39 // FBO ID used to render into | 102 |
40 GrGLuint renderFBOID() const { return fRTFBOID; } | 103 // FBO that should be rendered into. Always non-NULL. |
41 // FBO ID that has texture ID attached. | 104 const GrGLFBO* renderFBO() const { |
42 GrGLuint textureFBOID() const { return fTexFBOID; } | 105 SkASSERT(fRenderFBO && fRenderFBO->isValid()); |
106 return fRenderFBO; | |
107 } | |
108 | |
109 // FBO that has the target's texture ID attached. The return value may be: | |
110 // * NULL when this render target is not a texture, | |
111 // * the same as renderFBO() when this surface is not multisampled or a uto-resolves, | |
112 // * or different than renderFBO() when it requires explicit resolving via | |
113 // glBlitFramebuffer. | |
114 const GrGLFBO* textureFBO() const { | |
115 SkASSERT(!fTextureFBO || fTextureFBO->isValid()); | |
116 return fTextureFBO; | |
117 } | |
43 | 118 |
44 // override of GrRenderTarget | 119 // override of GrRenderTarget |
45 ResolveType getResolveType() const SK_OVERRIDE { | 120 ResolveType getResolveType() const SK_OVERRIDE { |
46 if (!this->isMultisampled() || | 121 if (!this->isMultisampled() || this->renderFBO() == this->textureFBO()) { |
47 fRTFBOID == fTexFBOID) { | |
48 // catches FBO 0 and non MSAA case | 122 // catches FBO 0 and non MSAA case |
49 return kAutoResolves_ResolveType; | 123 return kAutoResolves_ResolveType; |
50 } else if (kUnresolvableFBOID == fTexFBOID) { | 124 } else if (!this->textureFBO()) { |
51 return kCantResolve_ResolveType; | 125 return kCantResolve_ResolveType; |
52 } else { | 126 } else { |
53 return kCanResolve_ResolveType; | 127 return kCanResolve_ResolveType; |
54 } | 128 } |
55 } | 129 } |
56 | 130 |
57 /** When we don't own the FBO ID we don't attempt to modify its attachments. */ | 131 /** When we don't own the FBO ID we don't attempt to modify its attachments. */ |
58 bool canAttemptStencilAttachment() const SK_OVERRIDE { return !fIsWrapped; } | 132 bool canAttemptStencilAttachment() const SK_OVERRIDE { return !fIsWrapped; } |
59 | 133 |
60 protected: | 134 protected: |
61 // The public constructor registers this object with the cache. However, onl y the most derived | 135 // The public constructor registers this object with the cache. However, onl y the most derived |
62 // class should register with the cache. This constructor does not do the re gistration and | 136 // class should register with the cache. This constructor does not do the re gistration and |
63 // rather moves that burden onto the derived class. | 137 // rather moves that burden onto the derived class. |
64 enum Derived { kDerived }; | 138 enum Derived { kDerived }; |
65 GrGLRenderTarget(GrGLGpu*, const GrSurfaceDesc&, const IDDesc&, Derived); | 139 GrGLRenderTarget(GrGLGpu*, const GrSurfaceDesc&, const IDDesc&, Derived); |
66 | 140 |
67 void init(const GrSurfaceDesc&, const IDDesc&); | 141 void init(const GrSurfaceDesc&, const IDDesc&); |
68 | 142 |
69 void onAbandon() SK_OVERRIDE; | 143 void onAbandon() SK_OVERRIDE; |
70 void onRelease() SK_OVERRIDE; | 144 void onRelease() SK_OVERRIDE; |
71 | 145 |
72 // In protected because subclass GrGLTextureRenderTarget calls this version. | 146 // In protected because subclass GrGLTextureRenderTarget calls this version. |
73 size_t onGpuMemorySize() const SK_OVERRIDE; | 147 size_t onGpuMemorySize() const SK_OVERRIDE; |
74 | 148 |
75 private: | 149 private: |
76 GrGLuint fRTFBOID; | 150 SkAutoTUnref<GrGLFBO> fRenderFBO; |
77 GrGLuint fTexFBOID; | 151 SkAutoTUnref<GrGLFBO> fTextureFBO; |
78 GrGLuint fMSColorRenderbufferID; | 152 GrGLuint fMSColorRenderbufferID; |
79 | 153 |
80 // We track this separately from GrGpuResource because this may be both a te xture and a render | 154 // We track this separately from GrGpuResource because this may be both a te xture and a render |
81 // target, and the texture may be wrapped while the render target is not. | 155 // target, and the texture may be wrapped while the render target is not. |
82 bool fIsWrapped; | 156 bool fIsWrapped; |
83 | 157 |
84 // when we switch to this render target we want to set the viewport to | 158 // when we switch to this render target we want to set the viewport to |
85 // only render to content area (as opposed to the whole allocation) and | 159 // only render to content area (as opposed to the whole allocation) and |
86 // we want the rendering to be at top left (GL has origin in bottom left) | 160 // we want the rendering to be at top left (GL has origin in bottom left) |
87 GrGLIRect fViewport; | 161 GrGLIRect fViewport; |
88 | 162 |
89 // onGpuMemorySize() needs to know what how many color values are owned per pixel. However, | 163 // onGpuMemorySize() needs to know what how many color values are owned per pixel. However, |
90 // abandon and release zero out the IDs and the cache needs to know the size even after those | 164 // abandon and release zero out the IDs and the cache needs to know the size even after those |
91 // actions. | 165 // actions. |
92 uint8_t fColorValuesPerPixel; | 166 uint8_t fColorValuesPerPixel; |
93 | 167 |
94 typedef GrRenderTarget INHERITED; | 168 typedef GrRenderTarget INHERITED; |
95 }; | 169 }; |
96 | 170 |
97 #endif | 171 #endif |
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