1 files changed, 70 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/sksl/codegen/SkSLPipelineStageCodeGenerator.h b/gfx/skia/skia/src/sksl/codegen/SkSLPipelineStageCodeGenerator.h
new file mode 100644
index 0000000000..7efb0e187e
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+++ b/gfx/skia/skia/src/sksl/codegen/SkSLPipelineStageCodeGenerator.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SKSL_PIPELINESTAGECODEGENERATOR
+#define SKSL_PIPELINESTAGECODEGENERATOR
+
+#include "include/core/SkTypes.h"
+
+#if defined(SKSL_STANDALONE) || defined(SK_GANESH) || defined(SK_GRAPHITE)
+
+#include <string>
+
+namespace SkSL {
+
+struct Program;
+class VarDeclaration;
+
+namespace PipelineStage {
+    class Callbacks {
+    public:
+        virtual ~Callbacks() = default;
+
+        virtual std::string getMainName() { return "main"; }
+        virtual std::string getMangledName(const char* name) { return name; }
+        virtual void   defineFunction(const char* declaration, const char* body, bool isMain) = 0;
+        virtual void   declareFunction(const char* declaration) = 0;
+        virtual void   defineStruct(const char* definition) = 0;
+        virtual void   declareGlobal(const char* declaration) = 0;
+
+        virtual std::string declareUniform(const VarDeclaration*) = 0;
+        virtual std::string sampleShader(int index, std::string coords) = 0;
+        virtual std::string sampleColorFilter(int index, std::string color) = 0;
+        virtual std::string sampleBlender(int index, std::string src, std::string dst) = 0;
+
+        virtual std::string toLinearSrgb(std::string color) = 0;
+        virtual std::string fromLinearSrgb(std::string color) = 0;
+    };
+
+    /*
+     * Processes 'program' for use in a GrFragmentProcessor, or other context that wants SkSL-like
+     * code as input. To support fragment processor usage, there are callbacks that allow elements
+     * to be declared programmatically and to rename those elements (mangling to avoid collisions).
+     *
+     * - Any reference to the main coords builtin variable will be replaced with 'sampleCoords'.
+     * - Any reference to the input color builtin variable will be replaced with 'inputColor'.
+     * - Any reference to the dest color builtin variable will be replaced with 'destColor'.
+     *   Dest-color is used in blend programs.
+     * - Each uniform variable declaration triggers a call to 'declareUniform', which should emit
+     *   the declaration, and return the (possibly different) name to use for the variable.
+     * - Each function definition triggers a call to 'defineFunction', which should emit the
+     *   definition, and return the (possibly different) name to use for calls to that function.
+     * - Each invocation of sample() triggers a call to 'sampleChild', which should return the full
+     *   text of the call expression.
+     */
+    void ConvertProgram(const Program& program,
+                        const char* sampleCoords,
+                        const char* inputColor,
+                        const char* destColor,
+                        Callbacks* callbacks);
+}  // namespace PipelineStage
+
+}  // namespace SkSL
+
+#endif
+
+#endif