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include/gpu/GrProcessorUnitTest.h

+/*
+ * 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 GrProcessorUnitTest_DEFINED
+#define GrProcessorUnitTest_DEFINED
+
+#include "SkRandom.h"
+#include "SkTArray.h"
+#include "SkTypes.h"
+
+class SkMatrix;
+class GrDrawTargetCaps;
+
+namespace GrProcessorUnitTest {
+// Used to access the dummy textures in TestCreate procs.
+enum {
+    kSkiaPMTextureIdx = 0,
+    kAlphaTextureIdx = 1,
+};
+
+/**
+ * A helper for use in GrProcessor::TestCreate functions.
+ */
+const SkMatrix& TestMatrix(SkRandom*);
+
+}
+
+#if SK_ALLOW_STATIC_GLOBAL_INITIALIZERS
+
+class GrContext;
+class GrProcessor;
+class GrTexture;
+
+template <class Processor>
+class GrProcessorTestFactory : SkNoncopyable {
+public:
+
+    typedef Processor* (*CreateProc)(SkRandom*,
+                                    GrContext*,
+                                    const GrDrawTargetCaps& caps,
+                                    GrTexture* dummyTextures[]);
+
+    GrProcessorTestFactory(CreateProc createProc) {
+        fCreateProc = createProc;
+        GetFactories()->push_back(this);
+    }
+
+    static Processor* CreateStage(SkRandom* random,
+                                 GrContext* context,
+                                 const GrDrawTargetCaps& caps,
+                                 GrTexture* dummyTextures[]) {
+        uint32_t idx = random->nextRangeU(0, GetFactories()->count() - 1);
+        GrProcessorTestFactory<Processor>* factory = (*GetFactories())[idx];
+        return factory->fCreateProc(random, context, caps, dummyTextures);
+    }
+
+private:
+    CreateProc fCreateProc;
+
+    #if SK_ALLOW_STATIC_GLOBAL_INITIALIZERS
+    static SkTArray<GrProcessorTestFactory<Processor>*, true>* GetFactories() {
+        static SkTArray<GrProcessorTestFactory<Processor>*, true> gFactories;
+        return &gFactories;
+    }
+    #endif
+};
+
+/** GrProcessor subclasses should insert this macro in their declaration to be included in the
+ *  program generation unit test.
+ */
+
+#define GR_DECLARE_GEOMETRY_PROCESSOR_TEST                                                         \
+    static GrProcessorTestFactory<GrGeometryProcessor> gTestFactory;                               \
+    static GrGeometryProcessor* TestCreate(SkRandom*,                                              \
+                                GrContext*,                                                        \
+                                const GrDrawTargetCaps&,                                           \
+                                GrTexture* dummyTextures[2])
+
+#define GR_DECLARE_FRAGMENT_PROCESSOR_TEST                                                         \
+    static GrProcessorTestFactory<GrFragmentProcessor> gTestFactory;                               \
+    static GrFragmentProcessor* TestCreate(SkRandom*,                                              \
+                                GrContext*,                                                        \
+                                const GrDrawTargetCaps&,                                           \
+                                GrTexture* dummyTextures[2])
+
+/** GrProcessor subclasses should insert this macro in their implementation file. They must then
+ *  also implement this static function:
+ *      GrProcessor* TestCreate(SkRandom*,
+ *                           GrContext*,
+ *                           const GrDrawTargetCaps&,
+ *                           GrTexture* dummyTextures[2]);
+ * dummyTextures[] are valid textures that can optionally be used to construct GrTextureAccesses.
+ * The first texture has config kSkia8888_GrPixelConfig and the second has
+ * kAlpha_8_GrPixelConfig. TestCreate functions are also free to create additional textures using
+ * the GrContext.
+ */
+#define GR_DEFINE_FRAGMENT_PROCESSOR_TEST(Effect)                                                  \
+    GrProcessorTestFactory<GrFragmentProcessor> Effect :: gTestFactory(Effect :: TestCreate)
+
+#define GR_DEFINE_GEOMETRY_PROCESSOR_TEST(Effect)                                                  \
+    GrProcessorTestFactory<GrGeometryProcessor> Effect :: gTestFactory(Effect :: TestCreate)
+
+#else // !SK_ALLOW_STATIC_GLOBAL_INITIALIZERS
+
+// The unit test relies on static initializers. Just declare the TestCreate function so that
+// its definitions will compile.
+#define GR_DECLARE_FRAGMENT_PROCESSOR_TEST                                                         \
+    static GrFragmentProcessor* TestCreate(SkRandom*,                                              \
+                                GrContext*,                                                        \
+                                const GrDrawTargetCaps&,                                           \
+                                GrTexture* dummyTextures[2])
+#define GR_DEFINE_FRAGMENT_PROCESSOR_TEST(X)
+
+// The unit test relies on static initializers. Just declare the TestCreate function so that
+// its definitions will compile.
+#define GR_DECLARE_GEOMETRY_PROCESSOR_TEST                                                         \
+    static GrGeometryProcessor* TestCreate(SkRandom*,                                              \
+                                GrContext*,                                                        \
+                                const GrDrawTargetCaps&,                                           \
+                                GrTexture* dummyTextures[2])
+#define GR_DEFINE_GEOMETRY_PROCESSOR_TEST(X)
+
+#endif // !SK_ALLOW_STATIC_GLOBAL_INITIALIZERS
+#endif