Attempt to reland 8264-5 with warning-as-error fixes.
git-svn-id: http://skia.googlecode.com/svn/trunk@8272 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/gpu/GrDrawEffect.h b/include/gpu/GrDrawEffect.h
new file mode 100644
index 0000000..005de41
--- /dev/null
+++ b/include/gpu/GrDrawEffect.h
@@ -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