77af6805e5
Adds a GrCoordTransform class and updates the framework to handle coord transforms similar to how it handles textures with GrTextureAccess. Renames GrGLEffectMatrix to GrGLCoordTransform and slightly repurposes it to be used by the framework instead of effects. R=bsalomon@google.com, robertphillips@google.com Review URL: https://codereview.chromium.org/24853002 git-svn-id: http://skia.googlecode.com/svn/trunk@11569 2bbb7eff-a529-9590-31e7-b0007b416f81
51 lines
1.9 KiB
C++
51 lines
1.9 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.
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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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