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Unified Diff: include/gpu/GrDrawEffect.h

Issue 12531015: Adds local coords to GrEffect system. (Closed) Base URL: http://skia.googlecode.com/svn/trunk/
Patch Set: Created 7 years, 9 months ago
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Index: include/gpu/GrDrawEffect.h
===================================================================
--- include/gpu/GrDrawEffect.h (revision 0)
+++ include/gpu/GrDrawEffect.h (revision 0)
@@ -0,0 +1,51 @@
+
+#ifndef GrDrawEffect_DEFINED
+#define GrDrawEffect_DEFINED
+
+#include "GrEffectStage.h"
+
+/**
+ * This class is used to communicate the particular GrEffect used in a draw to the backend-specific
+ * effect subclass (e.g. GrGLEffect). It is used to by the backend-specific class to generate a
+ * cache key for the effect, generate code on a program cache miss, and to upload uniform values to
+ * the program.
+ * In addition to the effect, it also communicates any changes between the relationship between
+ * the view matrix and local coordinate system since the effect was installed in its GrDrawState.
+ * The typical use case is that sometime after an effect was installed a decision was made to draw
+ * in device coordinates (i.e. use an identity view-matrix). In such a case the GrDrawEffect's
+ * coord-change-matrix would be the inverse of the view matrix that was set when the effect was
+ * installed. GrGLEffectMatrix is a handy class that implements a local coordinate matrix that
+ * automatically accounts for the coord-change matrix.
+ */
+class GrDrawEffect {
+public:
+ GrDrawEffect(const GrEffectStage& stage, bool explicitLocalCoords)
+ : fEffectStage(&stage)
+ , fExplicitLocalCoords(explicitLocalCoords) {
+ GrAssert(NULL != fEffectStage);
+ GrAssert(NULL != fEffectStage->getEffect());
+ }
+ const GrEffectRef* effect() const { return fEffectStage->getEffect(); }
+
+ template <typename T>
+ const T& castEffect() const { return *static_cast<const T*>(this->effect()->get()); }
+
+ const SkMatrix& getCoordChangeMatrix() const {
+ if (fExplicitLocalCoords) {
+ return SkMatrix::I();
+ } else {
+ return fEffectStage->getCoordChangeMatrix();
+ }
+ }
+
+ bool programHasExplicitLocalCoords() const { return fExplicitLocalCoords; }
+
+ const int* getVertexAttribIndices() const { return fEffectStage->getVertexAttribIndices(); }
+ int getVertexAttribIndexCount() const { return fEffectStage->getVertexAttribIndexCount(); }
+
+private:
+ const GrEffectStage* fEffectStage;
+ bool fExplicitLocalCoords;
+};
+
+#endif
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