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1 /* | 1 /* |
2 * Copyright 2014 Google Inc. | 2 * Copyright 2014 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 GrXferProcessor_DEFINED | 8 #ifndef GrXferProcessor_DEFINED |
9 #define GrXferProcessor_DEFINED | 9 #define GrXferProcessor_DEFINED |
10 | 10 |
11 #include "GrColor.h" | 11 #include "GrColor.h" |
12 #include "GrProcessor.h" | 12 #include "GrFragmentProcessor.h" |
13 #include "GrTypes.h" | 13 #include "GrTypes.h" |
14 #include "SkXfermode.h" | 14 #include "SkXfermode.h" |
15 | 15 |
16 class GrDrawTargetCaps; | |
17 class GrGLCaps; | |
18 class GrGLXferProcessor; | |
19 class GrProcOptInfo; | 16 class GrProcOptInfo; |
20 | 17 |
21 /** | 18 /** |
22 * GrXferProcessor is responsible for implementing the xfer mode that blends the
src color and dst | 19 * GrXferProcessor is responsible for implementing the xfer mode that blends the
src color and dst |
23 * color. It does this by emitting fragment shader code and controlling the fixe
d-function blend | 20 * color. It does this by emitting fragment shader code and controlling the fixe
d-function blend |
24 * state. The inputs to its shader code are the final computed src color and fra
ctional pixel | 21 * state. The inputs to its shader code are the final computed src color and fra
ctional pixel |
25 * coverage. The GrXferProcessor's shader code writes the fragment shader output
color that goes | 22 * coverage. The GrXferProcessor's shader code writes the fragment shader output
color that goes |
26 * into the fixed-function blend. When dual-source blending is available, it may
also write a | 23 * into the fixed-function blend. When dual-source blending is available, it may
also write a |
27 * seconday fragment shader output color. When allowed by the backend API, the G
rXferProcessor may | 24 * seconday fragment shader output color. When allowed by the backend API, the G
rXferProcessor may |
28 * read the destination color. The GrXferProcessor is responsible for setting th
e blend coefficients | 25 * read the destination color. The GrXferProcessor is responsible for setting th
e blend coefficients |
29 * and blend constant color. | 26 * and blend constant color. |
30 * | 27 * |
31 * A GrXferProcessor is never installed directly into our draw state, but instea
d is created from a | 28 * A GrXferProcessor is never installed directly into our draw state, but instea
d is created from a |
32 * GrXPFactory once we have finalized the state of our draw. | 29 * GrXPFactory once we have finalized the state of our draw. |
33 */ | 30 */ |
34 class GrXferProcessor : public GrProcessor { | 31 class GrXferProcessor : public GrFragmentProcessor { |
35 public: | 32 public: |
36 /** | 33 /** |
37 * Sets a unique key on the GrProcessorKeyBuilder that is directly associate
d with this xfer | |
38 * processor's GL backend implementation. | |
39 */ | |
40 virtual void getGLProcessorKey(const GrGLCaps& caps, | |
41 GrProcessorKeyBuilder* b) const = 0; | |
42 | |
43 /** Returns a new instance of the appropriate *GL* implementation class | |
44 for the given GrXferProcessor; caller is responsible for deleting | |
45 the object. */ | |
46 virtual GrGLXferProcessor* createGLInstance() const = 0; | |
47 | |
48 /** | |
49 * Optimizations for blending / coverage that an OptDrawState should apply t
o itself. | 34 * Optimizations for blending / coverage that an OptDrawState should apply t
o itself. |
50 */ | 35 */ |
51 enum OptFlags { | 36 enum OptFlags { |
52 /** | 37 /** |
53 * No optimizations needed | 38 * No optimizations needed |
54 */ | 39 */ |
55 kNone_Opt = 0, | 40 kNone_Opt = 0, |
56 /** | 41 /** |
57 * The draw can be skipped completely. | 42 * The draw can be skipped completely. |
58 */ | 43 */ |
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82 * and color/coverage values for its draw. | 67 * and color/coverage values for its draw. |
83 */ | 68 */ |
84 // TODO: remove need for isCoverageDrawing once coverageDrawing is its own X
P. | 69 // TODO: remove need for isCoverageDrawing once coverageDrawing is its own X
P. |
85 // TODO: remove need for colorWriteDisabled once colorWriteDisabled is its o
wn XP. | 70 // TODO: remove need for colorWriteDisabled once colorWriteDisabled is its o
wn XP. |
86 virtual OptFlags getOptimizations(const GrProcOptInfo& colorPOI, | 71 virtual OptFlags getOptimizations(const GrProcOptInfo& colorPOI, |
87 const GrProcOptInfo& coveragePOI, | 72 const GrProcOptInfo& coveragePOI, |
88 bool isCoverageDrawing, | 73 bool isCoverageDrawing, |
89 bool colorWriteDisabled, | 74 bool colorWriteDisabled, |
90 bool doesStencilWrite, | 75 bool doesStencilWrite, |
91 GrColor* color, | 76 GrColor* color, |
92 uint8_t* coverage, | 77 uint8_t* coverage) = 0; |
93 const GrDrawTargetCaps& caps) = 0; | |
94 | 78 |
95 struct BlendInfo { | 79 struct BlendInfo { |
96 GrBlendCoeff fSrcBlend; | 80 GrBlendCoeff fSrcBlend; |
97 GrBlendCoeff fDstBlend; | 81 GrBlendCoeff fDstBlend; |
98 GrColor fBlendConstant; | 82 GrColor fBlendConstant; |
99 }; | 83 }; |
100 | 84 |
101 virtual void getBlendInfo(BlendInfo* blendInfo) const = 0; | 85 virtual void getBlendInfo(BlendInfo* blendInfo) const = 0; |
102 | 86 |
103 /** Will this prceossor read the destination pixel value? */ | 87 /** Will this prceossor read the destination pixel value? */ |
104 bool willReadDstColor() const { return fWillReadDstColor; } | 88 bool willReadDstColor() const { return fWillReadDstColor; } |
105 | 89 |
106 /** | |
107 * Returns whether or not this xferProcossor will set a secondary output to
be used with dual | |
108 * source blending. | |
109 */ | |
110 virtual bool hasSecondaryOutput() const { return false; } | |
111 | |
112 /** Returns true if this and other processor conservatively draw identically
. It can only return | |
113 true when the two processor are of the same subclass (i.e. they return t
he same object from | |
114 from getFactory()). | |
115 | |
116 A return value of true from isEqual() should not be used to test whether
the processor would | |
117 generate the same shader code. To test for identical code generation use
getGLProcessorKey*/ | |
118 | |
119 bool isEqual(const GrXferProcessor& that) const { | |
120 if (this->classID() != that.classID()) { | |
121 return false; | |
122 } | |
123 return this->onIsEqual(that); | |
124 } | |
125 | |
126 | |
127 protected: | 90 protected: |
128 GrXferProcessor() : fWillReadDstColor(false) {} | 91 GrXferProcessor() : fWillReadDstColor(false) {} |
129 | 92 |
130 /** | 93 /** |
131 * If the prceossor subclass will read the destination pixel value then it m
ust call this | 94 * If the prceossor subclass will read the destination pixel value then it m
ust call this |
132 * function from its constructor. Otherwise, when its generated backend-spec
ific prceossor class | 95 * function from its constructor. Otherwise, when its generated backend-spec
ific prceossor class |
133 * attempts to generate code that reads the destination pixel it will fail. | 96 * attempts to generate code that reads the destination pixel it will fail. |
134 */ | 97 */ |
135 void setWillReadDstColor() { fWillReadDstColor = true; } | 98 void setWillReadDstColor() { fWillReadDstColor = true; } |
136 | 99 |
137 private: | 100 private: |
138 virtual bool onIsEqual(const GrXferProcessor&) const = 0; | |
139 | 101 |
140 bool fWillReadDstColor; | 102 bool fWillReadDstColor; |
141 | 103 |
142 typedef GrFragmentProcessor INHERITED; | 104 typedef GrFragmentProcessor INHERITED; |
143 }; | 105 }; |
144 | 106 |
145 GR_MAKE_BITFIELD_OPS(GrXferProcessor::OptFlags); | 107 GR_MAKE_BITFIELD_OPS(GrXferProcessor::OptFlags); |
146 | 108 |
147 /** | 109 /** |
148 * We install a GrXPFactory (XPF) early on in the pipeline before all the final
draw information is | 110 * We install a GrXPFactory (XPF) early on in the pipeline before all the final
draw information is |
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243 enum { | 205 enum { |
244 kIllegalXPFClassID = 0, | 206 kIllegalXPFClassID = 0, |
245 }; | 207 }; |
246 static int32_t gCurrXPFClassID; | 208 static int32_t gCurrXPFClassID; |
247 | 209 |
248 typedef GrProgramElement INHERITED; | 210 typedef GrProgramElement INHERITED; |
249 }; | 211 }; |
250 | 212 |
251 #endif | 213 #endif |
252 | 214 |
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