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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GPU_COMMAND_BUFFER_SERVICE_SHADER_TRANSLATOR_H_
#define GPU_COMMAND_BUFFER_SERVICE_SHADER_TRANSLATOR_H_
#include <map>
#include <string>
#include "base/basictypes.h"
#include "base/scoped_ptr.h"
#include "third_party/angle/include/GLSLANG/ShaderLang.h"
namespace gpu {
namespace gles2 {
// Translates a GLSL ES 2.0 shader to desktop GLSL shader, or just
// validates GLSL ES 2.0 shaders on a true GLSL ES implementation.
class ShaderTranslatorInterface {
public:
virtual ~ShaderTranslatorInterface() { }
// Initializes the translator.
// Must be called once before using the translator object.
virtual bool Init(
ShShaderType shader_type,
ShShaderSpec shader_spec,
const ShBuiltInResources* resources,
bool implementation_is_glsl_es) = 0;
// Translates the given shader source.
// Returns true if translation is successful, false otherwise.
virtual bool Translate(const char* shader) = 0;
// The following functions return results from the last translation.
// The results are NULL/empty if the translation was unsuccessful.
// A valid info-log is always returned irrespective of whether translation
// was successful or not.
virtual const char* translated_shader() const = 0;
virtual const char* info_log() const = 0;
struct VariableInfo {
VariableInfo()
: type(0),
size(0) {
}
VariableInfo(int _type, int _size)
: type(_type),
size(_size) {
}
int type;
int size;
};
// Mapping between variable name and info.
typedef std::map<std::string, VariableInfo> VariableMap;
virtual const VariableMap& attrib_map() const = 0;
virtual const VariableMap& uniform_map() const = 0;
};
// Implementation of ShaderTranslatorInterface
class ShaderTranslator : public ShaderTranslatorInterface {
public:
ShaderTranslator();
virtual ~ShaderTranslator();
// Overridden from ShaderTranslatorInterface.
virtual bool Init(
ShShaderType shader_type,
ShShaderSpec shader_spec,
const ShBuiltInResources* resources,
bool implementation_is_glsl_es);
// Overridden from ShaderTranslatorInterface.
virtual bool Translate(const char* shader);
// Overridden from ShaderTranslatorInterface.
virtual const char* translated_shader() const;
virtual const char* info_log() const;
// Overridden from ShaderTranslatorInterface.
virtual const VariableMap& attrib_map() const;
virtual const VariableMap& uniform_map() const;
private:
void ClearResults();
ShHandle compiler_;
scoped_array<char> translated_shader_;
scoped_array<char> info_log_;
VariableMap attrib_map_;
VariableMap uniform_map_;
bool implementation_is_glsl_es_;
DISALLOW_COPY_AND_ASSIGN(ShaderTranslator);
};
} // namespace gles2
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_SHADER_TRANSLATOR_H_
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