Add file accidentally omitted from r6182.
git-svn-id: http://skia.googlecode.com/svn/branches/gpu_dev@6186 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/gpu/GrTBackendEffectFactory.h b/include/gpu/GrTBackendEffectFactory.h
new file mode 100644
index 0000000..52dbc64
--- /dev/null
+++ b/include/gpu/GrTBackendEffectFactory.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrTBackendEffectFactory_DEFINED
+#define GrTBackendEffectFactory_DEFINED
+
+#include "GrBackendEffectFactory.h"
+#include "GrEffectStage.h"
+
+/**
+ * Implements GrBackendEffectFactory for a GrEffect subclass as a singleton.
+ */
+template <typename EffectClass>
+class GrTBackendEffectFactory : public GrBackendEffectFactory {
+
+public:
+ typedef typename EffectClass::GLEffect GLEffect;
+
+ /** Returns a human-readable name that is accessible via GrEffect or
+ GrGLEffect and is consistent between the two of them.
+ */
+ virtual const char* name() const SK_OVERRIDE { return EffectClass::Name(); }
+
+ /** Returns a value that identifies the GLSL shader code generated by
+ a GrEffect. This enables caching of generated shaders. Part of the
+ id identifies the GrEffect subclass. The remainder is based
+ on the aspects of the GrEffect object's configuration that affect
+ GLSL code generation. */
+ virtual EffectKey glEffectKey(const GrEffectStage& stage,
+ const GrGLCaps& caps) const SK_OVERRIDE {
+ GrAssert(kIllegalEffectClassID != fEffectClassID);
+ EffectKey effectKey = GLEffect::GenKey(stage, caps);
+ EffectKey textureKey = GLEffect::GenTextureKey(*stage.getEffect(), caps);
+#if GR_DEBUG
+ static const EffectKey kIllegalIDMask = (uint16_t) (~((1U << kEffectKeyBits) - 1));
+ GrAssert(!(kIllegalIDMask & effectKey));
+
+ static const EffectKey kIllegalTextureKeyMask = (uint16_t) (~((1U << kTextureKeyBits) - 1));
+ GrAssert(!(kIllegalTextureKeyMask & textureKey));
+#endif
+ return fEffectClassID | (textureKey << kEffectKeyBits) | effectKey;
+ }
+
+ /** Returns a new instance of the appropriate *GL* implementation class
+ for the given GrEffect; caller is responsible for deleting
+ the object. */
+ virtual GLEffect* createGLInstance(const GrEffect& effect) const SK_OVERRIDE {
+ return SkNEW_ARGS(GLEffect, (*this, effect));
+ }
+
+ /** This class is a singleton. This function returns the single instance.
+ */
+ static const GrBackendEffectFactory& getInstance() {
+ static SkAlignedSTStorage<1, GrTBackendEffectFactory> gInstanceMem;
+ static const GrTBackendEffectFactory* gInstance;
+ if (!gInstance) {
+ gInstance = SkNEW_PLACEMENT(gInstanceMem.get(),
+ GrTBackendEffectFactory);
+ }
+ return *gInstance;
+ }
+
+protected:
+ GrTBackendEffectFactory() {
+ fEffectClassID = GenID() << (kEffectKeyBits + kTextureKeyBits) ;
+ }
+};
+
+#endif