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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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