1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/gpu/GrDrawEffect.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,50 @@
1.4 +
1.5 +#ifndef GrDrawEffect_DEFINED
1.6 +#define GrDrawEffect_DEFINED
1.7 +
1.8 +#include "GrEffectStage.h"
1.9 +
1.10 +/**
1.11 + * This class is used to communicate the particular GrEffect used in a draw to the backend-specific
1.12 + * effect subclass (e.g. GrGLEffect). It is used to by the backend-specific class to generate a
1.13 + * cache key for the effect, generate code on a program cache miss, and to upload uniform values to
1.14 + * the program.
1.15 + * In addition to the effect, it also communicates any changes between the relationship between
1.16 + * the view matrix and local coordinate system since the effect was installed in its GrDrawState.
1.17 + * The typical use case is that sometime after an effect was installed a decision was made to draw
1.18 + * in device coordinates (i.e. use an identity view-matrix). In such a case the GrDrawEffect's
1.19 + * coord-change-matrix would be the inverse of the view matrix that was set when the effect was
1.20 + * installed.
1.21 + */
1.22 +class GrDrawEffect {
1.23 +public:
1.24 + GrDrawEffect(const GrEffectStage& stage, bool explicitLocalCoords)
1.25 + : fEffectStage(&stage)
1.26 + , fExplicitLocalCoords(explicitLocalCoords) {
1.27 + SkASSERT(NULL != fEffectStage);
1.28 + SkASSERT(NULL != fEffectStage->getEffect());
1.29 + }
1.30 + const GrEffectRef* effect() const { return fEffectStage->getEffect(); }
1.31 +
1.32 + template <typename T>
1.33 + const T& castEffect() const { return *static_cast<const T*>(this->effect()->get()); }
1.34 +
1.35 + const SkMatrix& getCoordChangeMatrix() const {
1.36 + if (fExplicitLocalCoords) {
1.37 + return SkMatrix::I();
1.38 + } else {
1.39 + return fEffectStage->getCoordChangeMatrix();
1.40 + }
1.41 + }
1.42 +
1.43 + bool programHasExplicitLocalCoords() const { return fExplicitLocalCoords; }
1.44 +
1.45 + const int* getVertexAttribIndices() const { return fEffectStage->getVertexAttribIndices(); }
1.46 + int getVertexAttribIndexCount() const { return fEffectStage->getVertexAttribIndexCount(); }
1.47 +
1.48 +private:
1.49 + const GrEffectStage* fEffectStage;
1.50 + bool fExplicitLocalCoords;
1.51 +};
1.52 +
1.53 +#endif
