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include/gpu/GrTBackendProcessorFactory.h

Index: include/gpu/GrTBackendProcessorFactory.h
diff --git a/include/gpu/GrTBackendProcessorFactory.h b/include/gpu/GrTBackendProcessorFactory.h
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+/*
+ * 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 GrTBackendProcessorFactory_DEFINED
+#define GrTBackendProcessorFactory_DEFINED
+
+#include "GrBackendProcessorFactory.h"
+#include "gl/GrGLProgramEffects.h"
+
+/**
+ * Implements GrBackendEffectFactory for a GrProcessor subclass as a singleton. This can be used by
+ * most GrProcessor subclasses to implement the GrProcessor::getFactory() method:
+ *
+ * const GrBackendEffectFactory& MyEffect::getFactory() const {
+ *     return GrTBackendEffectFactory<MyEffect>::getInstance();
+ * }
+ *
+ * Using this class requires that the GrProcessor subclass always produces the same GrGLProcessor
+ * subclass. Additionally, it adds the following requirements to the GrProcessor and GrGLProcessor
+ * subclasses:
+ *
+ * 1. The GrGLProcessor used by GrProcessor subclass MyEffect must be named or typedef'ed to
+ *    MyEffect::GLProcessor.
+ * 2. MyEffect::GLProcessor must have a static function:
+ *      EffectKey GenKey(const GrProcessor, const GrGLCaps&)
+ *    which generates a key that maps 1 to 1 with code variations emitted by
+ *    MyEffect::GLProcessor::emitCode().
+ * 3. MyEffect must have a static function:
+ *      const char* Name()
+ *    which returns a human-readable name for the effect.
+ */
+template <class ProcessorClass, class BackEnd, class ProcessorBase, class GLProcessorBase>
+class GrTBackendProcessorFactory : public BackEnd {
+public:
+    typedef typename ProcessorClass::GLProcessor GLProcessor;
+
+    /** Returns a human-readable name for the effect. Implemented using GLProcessor::Name as
+     *  described in this class's comment. */
+    virtual const char* name() const SK_OVERRIDE { return ProcessorClass::Name(); }
+
+
+    /** Implemented using GLProcessor::GenKey as described in this class's comment. */
+    virtual void getGLProcessorKey(const GrProcessor& effect,
+                                   const GrGLCaps& caps,
+                                   GrProcessorKeyBuilder* b) const SK_OVERRIDE {
+        GLProcessor::GenKey(effect, caps, b);
+    }
+
+    /** Returns a new instance of the appropriate *GL* implementation class
+        for the given GrProcessor; caller is responsible for deleting
+        the object. */
+    virtual GLProcessorBase* createGLInstance(const ProcessorBase& effect) const SK_OVERRIDE {
+        return SkNEW_ARGS(GLProcessor, (*this, effect));
+    }
+
+    /** This class is a singleton. This function returns the single instance. */
+    static const BackEnd& getInstance() {
+        static SkAlignedSTStorage<1, GrTBackendProcessorFactory> gInstanceMem;
+        static const GrTBackendProcessorFactory* gInstance;
+        if (!gInstance) {
+            gInstance = SkNEW_PLACEMENT(gInstanceMem.get(),
+                                        GrTBackendProcessorFactory);
+        }
+        return *gInstance;
+    }
+
+protected:
+    GrTBackendProcessorFactory() {}
+};
+
+/*
+ * Every effect so far derives from one of the following subclasses of GrTBackendProcessorFactory.
+ * All of this machinery is necessary to ensure that creatGLInstace is typesafe and does not
+ * require any casting
+ */
+template <class ProcessorClass>
+class GrTBackendGeometryProcessorFactory
+        : public GrTBackendProcessorFactory<ProcessorClass,
+                                            GrBackendGeometryProcessorFactory,
+                                            GrGeometryProcessor,
+                                            GrGLGeometryProcessor> {
+protected:
+    GrTBackendGeometryProcessorFactory() {}
+};
+
+template <class ProcessorClass>
+class GrTBackendFragmentProcessorFactory
+        : public GrTBackendProcessorFactory<ProcessorClass,
+                                           GrBackendFragmentProcessorFactory,
+                                           GrFragmentProcessor,
+                                           GrGLFragmentProcessor> {
+protected:
+    GrTBackendFragmentProcessorFactory() {}
+};
+
+
+#endif