f6de475e5c
R=bsalomon@google.com Review URL: https://codereview.chromium.org/22850006 git-svn-id: http://skia.googlecode.com/svn/trunk@10789 2bbb7eff-a529-9590-31e7-b0007b416f81
52 lines
2.1 KiB
C++
52 lines
2.1 KiB
C++
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#ifndef GrDrawEffect_DEFINED
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#define GrDrawEffect_DEFINED
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#include "GrEffectStage.h"
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/**
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* This class is used to communicate the particular GrEffect used in a draw to the backend-specific
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* effect subclass (e.g. GrGLEffect). It is used to by the backend-specific class to generate a
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* cache key for the effect, generate code on a program cache miss, and to upload uniform values to
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* the program.
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* In addition to the effect, it also communicates any changes between the relationship between
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* the view matrix and local coordinate system since the effect was installed in its GrDrawState.
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* The typical use case is that sometime after an effect was installed a decision was made to draw
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* in device coordinates (i.e. use an identity view-matrix). In such a case the GrDrawEffect's
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* coord-change-matrix would be the inverse of the view matrix that was set when the effect was
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* installed. GrGLEffectMatrix is a handy class that implements a local coordinate matrix that
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* automatically accounts for the coord-change matrix.
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*/
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class GrDrawEffect {
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public:
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GrDrawEffect(const GrEffectStage& stage, bool explicitLocalCoords)
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: fEffectStage(&stage)
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, fExplicitLocalCoords(explicitLocalCoords) {
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SkASSERT(NULL != fEffectStage);
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SkASSERT(NULL != fEffectStage->getEffect());
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}
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const GrEffectRef* effect() const { return fEffectStage->getEffect(); }
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template <typename T>
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const T& castEffect() const { return *static_cast<const T*>(this->effect()->get()); }
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const SkMatrix& getCoordChangeMatrix() const {
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if (fExplicitLocalCoords) {
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return SkMatrix::I();
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} else {
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return fEffectStage->getCoordChangeMatrix();
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}
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}
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bool programHasExplicitLocalCoords() const { return fExplicitLocalCoords; }
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const int* getVertexAttribIndices() const { return fEffectStage->getVertexAttribIndices(); }
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int getVertexAttribIndexCount() const { return fEffectStage->getVertexAttribIndexCount(); }
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private:
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const GrEffectStage* fEffectStage;
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bool fExplicitLocalCoords;
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};
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#endif
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