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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 "GrFragmentProcessor.h" | 12 #include "GrProcessor.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; |
16 class GrProcOptInfo; | 19 class GrProcOptInfo; |
17 | 20 |
18 /** | 21 /** |
19 * GrXferProcessor is responsible for implementing the xfer mode that blends the
src color and dst | 22 * GrXferProcessor is responsible for implementing the xfer mode that blends the
src color and dst |
20 * color. It does this by emitting fragment shader code and controlling the fixe
d-function blend | 23 * color. It does this by emitting fragment shader code and controlling the fixe
d-function blend |
21 * state. The inputs to its shader code are the final computed src color and fra
ctional pixel | 24 * state. The inputs to its shader code are the final computed src color and fra
ctional pixel |
22 * coverage. The GrXferProcessor's shader code writes the fragment shader output
color that goes | 25 * coverage. The GrXferProcessor's shader code writes the fragment shader output
color that goes |
23 * into the fixed-function blend. When dual-source blending is available, it may
also write a | 26 * into the fixed-function blend. When dual-source blending is available, it may
also write a |
24 * seconday fragment shader output color. When allowed by the backend API, the G
rXferProcessor may | 27 * seconday fragment shader output color. When allowed by the backend API, the G
rXferProcessor may |
25 * read the destination color. The GrXferProcessor is responsible for setting th
e blend coefficients | 28 * read the destination color. The GrXferProcessor is responsible for setting th
e blend coefficients |
26 * and blend constant color. | 29 * and blend constant color. |
27 * | 30 * |
28 * A GrXferProcessor is never installed directly into our draw state, but instea
d is created from a | 31 * A GrXferProcessor is never installed directly into our draw state, but instea
d is created from a |
29 * GrXPFactory once we have finalized the state of our draw. | 32 * GrXPFactory once we have finalized the state of our draw. |
30 */ | 33 */ |
31 class GrXferProcessor : public GrFragmentProcessor { | 34 class GrXferProcessor : public GrProcessor { |
32 public: | 35 public: |
33 /** | 36 /** |
| 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 /** |
34 * Optimizations for blending / coverage that an OptDrawState should apply t
o itself. | 49 * Optimizations for blending / coverage that an OptDrawState should apply t
o itself. |
35 */ | 50 */ |
36 enum OptFlags { | 51 enum OptFlags { |
37 /** | 52 /** |
38 * No optimizations needed | 53 * No optimizations needed |
39 */ | 54 */ |
40 kNone_Opt = 0, | 55 kNone_Opt = 0, |
41 /** | 56 /** |
42 * The draw can be skipped completely. | 57 * The draw can be skipped completely. |
43 */ | 58 */ |
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67 * and color/coverage values for its draw. | 82 * and color/coverage values for its draw. |
68 */ | 83 */ |
69 // TODO: remove need for isCoverageDrawing once coverageDrawing is its own X
P. | 84 // TODO: remove need for isCoverageDrawing once coverageDrawing is its own X
P. |
70 // TODO: remove need for colorWriteDisabled once colorWriteDisabled is its o
wn XP. | 85 // TODO: remove need for colorWriteDisabled once colorWriteDisabled is its o
wn XP. |
71 virtual OptFlags getOptimizations(const GrProcOptInfo& colorPOI, | 86 virtual OptFlags getOptimizations(const GrProcOptInfo& colorPOI, |
72 const GrProcOptInfo& coveragePOI, | 87 const GrProcOptInfo& coveragePOI, |
73 bool isCoverageDrawing, | 88 bool isCoverageDrawing, |
74 bool colorWriteDisabled, | 89 bool colorWriteDisabled, |
75 bool doesStencilWrite, | 90 bool doesStencilWrite, |
76 GrColor* color, | 91 GrColor* color, |
77 uint8_t* coverage) = 0; | 92 uint8_t* coverage, |
| 93 const GrDrawTargetCaps& caps) = 0; |
78 | 94 |
79 struct BlendInfo { | 95 struct BlendInfo { |
80 GrBlendCoeff fSrcBlend; | 96 GrBlendCoeff fSrcBlend; |
81 GrBlendCoeff fDstBlend; | 97 GrBlendCoeff fDstBlend; |
82 GrColor fBlendConstant; | 98 GrColor fBlendConstant; |
83 }; | 99 }; |
84 | 100 |
85 virtual void getBlendInfo(BlendInfo* blendInfo) const = 0; | 101 virtual void getBlendInfo(BlendInfo* blendInfo) const = 0; |
86 | 102 |
87 /** Will this prceossor read the destination pixel value? */ | 103 /** Will this prceossor read the destination pixel value? */ |
88 bool willReadDstColor() const { return fWillReadDstColor; } | 104 bool willReadDstColor() const { return fWillReadDstColor; } |
89 | 105 |
| 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 |
90 protected: | 127 protected: |
91 GrXferProcessor() : fWillReadDstColor(false) {} | 128 GrXferProcessor() : fWillReadDstColor(false) {} |
92 | 129 |
93 /** | 130 /** |
94 * If the prceossor subclass will read the destination pixel value then it m
ust call this | 131 * If the prceossor subclass will read the destination pixel value then it m
ust call this |
95 * function from its constructor. Otherwise, when its generated backend-spec
ific prceossor class | 132 * function from its constructor. Otherwise, when its generated backend-spec
ific prceossor class |
96 * attempts to generate code that reads the destination pixel it will fail. | 133 * attempts to generate code that reads the destination pixel it will fail. |
97 */ | 134 */ |
98 void setWillReadDstColor() { fWillReadDstColor = true; } | 135 void setWillReadDstColor() { fWillReadDstColor = true; } |
99 | 136 |
100 private: | 137 private: |
| 138 virtual bool onIsEqual(const GrXferProcessor&) const = 0; |
101 | 139 |
102 bool fWillReadDstColor; | 140 bool fWillReadDstColor; |
103 | 141 |
104 typedef GrFragmentProcessor INHERITED; | 142 typedef GrFragmentProcessor INHERITED; |
105 }; | 143 }; |
106 | 144 |
107 GR_MAKE_BITFIELD_OPS(GrXferProcessor::OptFlags); | 145 GR_MAKE_BITFIELD_OPS(GrXferProcessor::OptFlags); |
108 | 146 |
109 /** | 147 /** |
110 * We install a GrXPFactory (XPF) early on in the pipeline before all the final
draw information is | 148 * We install a GrXPFactory (XPF) early on in the pipeline before all the final
draw information is |
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205 enum { | 243 enum { |
206 kIllegalXPFClassID = 0, | 244 kIllegalXPFClassID = 0, |
207 }; | 245 }; |
208 static int32_t gCurrXPFClassID; | 246 static int32_t gCurrXPFClassID; |
209 | 247 |
210 typedef GrProgramElement INHERITED; | 248 typedef GrProgramElement INHERITED; |
211 }; | 249 }; |
212 | 250 |
213 #endif | 251 #endif |
214 | 252 |
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