michael@0: 
michael@0: #ifndef GrDrawEffect_DEFINED
michael@0: #define GrDrawEffect_DEFINED
michael@0: 
michael@0: #include "GrEffectStage.h"
michael@0: 
michael@0: /**
michael@0:  * This class is used to communicate the particular GrEffect used in a draw to the backend-specific
michael@0:  * effect subclass (e.g. GrGLEffect). It is used to by the backend-specific class to generate a
michael@0:  * cache key for the effect, generate code on a program cache miss, and to upload uniform values to
michael@0:  * the program.
michael@0:  * In addition to the effect, it also communicates any changes between the relationship between
michael@0:  * the view matrix and local coordinate system since the effect was installed in its GrDrawState.
michael@0:  * The typical use case is that sometime after an effect was installed a decision was made to draw
michael@0:  * in device coordinates (i.e. use an identity view-matrix). In such a case the GrDrawEffect's
michael@0:  * coord-change-matrix would be the inverse of the view matrix that was set when the effect was
michael@0:  * installed.
michael@0:  */
michael@0: class GrDrawEffect {
michael@0: public:
michael@0:     GrDrawEffect(const GrEffectStage& stage, bool explicitLocalCoords)
michael@0:         : fEffectStage(&stage)
michael@0:         , fExplicitLocalCoords(explicitLocalCoords) {
michael@0:         SkASSERT(NULL != fEffectStage);
michael@0:         SkASSERT(NULL != fEffectStage->getEffect());
michael@0:     }
michael@0:     const GrEffectRef* effect() const { return fEffectStage->getEffect(); }
michael@0: 
michael@0:     template <typename T>
michael@0:     const T& castEffect() const { return *static_cast<const T*>(this->effect()->get()); }
michael@0: 
michael@0:     const SkMatrix& getCoordChangeMatrix() const {
michael@0:         if (fExplicitLocalCoords) {
michael@0:             return SkMatrix::I();
michael@0:         } else {
michael@0:             return fEffectStage->getCoordChangeMatrix();
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     bool programHasExplicitLocalCoords() const { return fExplicitLocalCoords; }
michael@0: 
michael@0:     const int* getVertexAttribIndices() const { return fEffectStage->getVertexAttribIndices(); }
michael@0:     int getVertexAttribIndexCount() const { return fEffectStage->getVertexAttribIndexCount(); }
michael@0: 
michael@0: private:
michael@0:     const GrEffectStage*    fEffectStage;
michael@0:     bool                    fExplicitLocalCoords;
michael@0: };
michael@0: 
michael@0: #endif