Re-land sksl fragment processor support

This reverts commit ed50200682e0de72c3abecaa4d5324ebcd1ed9f9.

Bug: skia:
Change-Id: I9caa7454b391450620d6989dc472abb3cf7a2cab
Reviewed-on: https://skia-review.googlesource.com/20965
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

1 files changed, 80 insertions, 0 deletions

diff --git a/src/sksl/SkSLCPPCodeGenerator.h b/src/sksl/SkSLCPPCodeGenerator.h
new file mode 100644
index 0000000000..c7388add3f
--- /dev/null
+++ b/src/sksl/SkSLCPPCodeGenerator.h
@@ -0,0 +1,80 @@
+/*
+ * 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_CPPCODEGENERATOR
+#define SKSL_CPPCODEGENERATOR
+
+#include "SkSLGLSLCodeGenerator.h"
+#include "SkSLSectionAndParameterHelper.h"
+
+#include <set>
+
+namespace SkSL {
+
+class CPPCodeGenerator : public GLSLCodeGenerator {
+public:
+    CPPCodeGenerator(const Context* context, const Program* program, ErrorReporter* errors,
+                     String name, OutputStream* out);
+
+    bool generateCode() override;
+
+private:
+    void writef(const char* s, va_list va) SKSL_PRINTF_LIKE(2, 0);
+
+    void writef(const char* s, ...) SKSL_PRINTF_LIKE(2, 3);
+
+    void writeSection(const char* name, const char* prefix = "");
+
+    void writeHeader() override;
+
+    void writePrecisionModifier() override;
+
+    void writeBinaryExpression(const BinaryExpression& b, Precedence parentPrecedence) override;
+
+    void writeIndexExpression(const IndexExpression& i) override;
+
+    void writeVariableReference(const VariableReference& ref) override;
+
+    void writeFunction(const FunctionDefinition& f) override;
+
+    void writeSetting(const Setting& s) override;
+
+    void writeProgramElement(const ProgramElement& p) override;
+
+    void addUniform(const Variable& var);
+
+    // writes a printf escape that will be filled in at runtime by the given C++ expression string
+    void writeRuntimeValue(const Type& type, const String& cppCode);
+
+    void writeVarInitializer(const Variable& var, const Expression& value) override;
+
+    void writePrivateVars();
+
+    void writePrivateVarValues();
+
+    bool writeEmitCode(std::vector<const Variable*>& uniforms);
+
+    void writeSetData(std::vector<const Variable*>& uniforms);
+
+    void writeGetKey();
+
+    void writeTest();
+
+    String fName;
+    String fFullName;
+    SectionAndParameterHelper fSectionAndParameterHelper;
+    String fExtraEmitCodeCode;
+    std::vector<String> fFormatArgs;
+    std::set<int> fWrittenTransformedCoords;
+    bool fNeedColorSpaceHelper = false;
+
+    typedef GLSLCodeGenerator INHERITED;
+};
+
+}
+
+#endif