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1 | |
2 #ifndef GrDrawEffect_DEFINED | |
3 #define GrDrawEffect_DEFINED | |
4 | |
5 #include "GrEffectStage.h" | |
6 | |
7 /** | |
8 * This class is used to communicate the particular GrEffect used in a draw to t
he backend-specific | |
9 * effect subclass (e.g. GrGLEffect). It is used to by the backend-specific clas
s to generate a | |
10 * cache key for the effect, generate code on a program cache miss, and to uploa
d uniform values to | |
11 * the program. | |
12 * In addition to the effect, it also communicates any changes between the relat
ionship between | |
13 * the view matrix and local coordinate system since the effect was installed in
its GrDrawState. | |
14 * The typical use case is that sometime after an effect was installed a decisio
n was made to draw | |
15 * in device coordinates (i.e. use an identity view-matrix). In such a case the
GrDrawEffect's | |
16 * coord-change-matrix would be the inverse of the view matrix that was set when
the effect was | |
17 * installed. | |
18 */ | |
19 class GrDrawEffect { | |
20 public: | |
21 GrDrawEffect(const GrEffectStage& stage, bool explicitLocalCoords) | |
22 : fEffectStage(&stage) | |
23 , fExplicitLocalCoords(explicitLocalCoords) { | |
24 SkASSERT(fEffectStage); | |
25 SkASSERT(fEffectStage->getEffect()); | |
26 } | |
27 const GrEffect* effect() const { return fEffectStage->getEffect(); } | |
28 | |
29 template <typename T> | |
30 const T& castEffect() const { return *static_cast<const T*>(this->effect());
} | |
31 | |
32 const SkMatrix& getCoordChangeMatrix() const { | |
33 if (fExplicitLocalCoords) { | |
34 return SkMatrix::I(); | |
35 } else { | |
36 return fEffectStage->getCoordChangeMatrix(); | |
37 } | |
38 } | |
39 | |
40 bool programHasExplicitLocalCoords() const { return fExplicitLocalCoords; } | |
41 | |
42 private: | |
43 const GrEffectStage* fEffectStage; | |
44 bool fExplicitLocalCoords; | |
45 }; | |
46 | |
47 #endif | |
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