GLProgramsTest can now randomly create a tree of GrFragmentProcessors instead of a linear pipeline

include/core/SkComposeShader.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkComposeShader_DEFINED
@@ skipping 66 matching lines @@
     Context* onCreateContext(const ContextRec&, void*) const override;
 
 private:
     SkShader*   fShaderA;
     SkShader*   fShaderB;
     SkXfermode* fMode;
 
     typedef SkShader INHERITED;
 };
 
+#if SK_SUPPORT_GPU
+
+#include "SkString.h"
+#include "../gpu/GrFragmentProcessor.h"
+
+/////////////////////////////////////////////////////////////////////
+
+class GrComposeEffect : public GrFragmentProcessor {
+public:
+
+    static GrFragmentProcessor* Create(const GrFragmentProcessor* fpA,
+                                       const GrFragmentProcessor* fpB,
+                                       SkXfermode::Mode mode);
+    const char* name() const override {return fName.c_str(); }

[tomhudson, 2015/08/25 19:29:24]

Teensy-tiny nit: space before return.

[wangyix, 2015/08/25 21:34:09]

Done.

+    void onGetGLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override;
+
+    SkXfermode::Mode getMode() const { return fMode; }
+    int getShaderAChildIndex() const { return fShaderAChildIndex; }
+    int getShaderBChildIndex() const { return fShaderBChildIndex; }
+
+protected:
+    bool onIsEqual(const GrFragmentProcessor&) const override;
+    void onComputeInvariantOutput(GrInvariantOutput* inout) const override;
+
+private:
+    GrComposeEffect(const GrFragmentProcessor* fpA, const GrFragmentProcessor* fpB,
+                    SkXfermode::Mode mode);
+
+    GrGLFragmentProcessor* onCreateGLInstance() const override;
+
+    SkString fName;
+    int fShaderAChildIndex;
+    int fShaderBChildIndex;
+    SkXfermode::Mode fMode;
+
+    GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
+
+    typedef GrFragmentProcessor INHERITED;
+};
+
 #endif
+
+#endif