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// Copyright (c) 2012 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 <string>
#include "base/containers/hash_tables.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/observer_list.h"
#include "gpu/gpu_gles2_export.h"
#include "third_party/angle/include/GLSLANG/ShaderLang.h"
namespace gl {
struct GLVersionInfo;
}
namespace gpu {
namespace gles2 {
// Mapping between variable name and info.
typedef base::hash_map<std::string, sh::Attribute> AttributeMap;
typedef std::vector<sh::OutputVariable> OutputVariableList;
typedef base::hash_map<std::string, sh::Uniform> UniformMap;
typedef base::hash_map<std::string, sh::Varying> VaryingMap;
typedef base::hash_map<std::string, sh::InterfaceBlock> InterfaceBlockMap;
typedef base::RefCountedData<std::string> OptionsAffectingCompilationString;
// 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 base::RefCounted<ShaderTranslatorInterface> {
public:
ShaderTranslatorInterface() = default;
// Initializes the translator.
// Must be called once before using the translator object.
virtual bool Init(sh::GLenum shader_type,
ShShaderSpec shader_spec,
const ShBuiltInResources* resources,
ShShaderOutput shader_output_language,
ShCompileOptions driver_bug_workarounds,
bool gl_shader_interm_output) = 0;
// Translates the given shader source.
// Returns true if translation is successful, false otherwise.
// Always fill |info_log| if it's non-null.
// Upon success, fill |translated_shader|, |attrib_map|, |uniform_map|,
// |varying_map|, and |name_map| if they are non-null.
virtual bool Translate(const std::string& shader_source,
std::string* info_log,
std::string* translated_shader,
int* shader_version,
AttributeMap* attrib_map,
UniformMap* uniform_map,
VaryingMap* varying_map,
InterfaceBlockMap* interface_block_map,
OutputVariableList* output_variable_list) const = 0;
// Return a string that is unique for a specfic set of options that would
// possibly affect compilation.
virtual OptionsAffectingCompilationString*
GetStringForOptionsThatWouldAffectCompilation() const = 0;
protected:
virtual ~ShaderTranslatorInterface() = default;
private:
friend class base::RefCounted<ShaderTranslatorInterface>;
DISALLOW_COPY_AND_ASSIGN(ShaderTranslatorInterface);
};
// Implementation of ShaderTranslatorInterface
class GPU_GLES2_EXPORT ShaderTranslator : public ShaderTranslatorInterface {
public:
class DestructionObserver {
public:
DestructionObserver();
virtual ~DestructionObserver();
virtual void OnDestruct(ShaderTranslator* translator) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(DestructionObserver);
};
ShaderTranslator();
// Return shader output lanaguage type based on the context version.
static ShShaderOutput GetShaderOutputLanguageForContext(
const gl::GLVersionInfo& context_version);
// Overridden from ShaderTranslatorInterface.
bool Init(sh::GLenum shader_type,
ShShaderSpec shader_spec,
const ShBuiltInResources* resources,
ShShaderOutput shader_output_language,
ShCompileOptions driver_bug_workarounds,
bool gl_shader_interm_output) override;
// Overridden from ShaderTranslatorInterface.
bool Translate(const std::string& shader_source,
std::string* info_log,
std::string* translated_source,
int* shader_version,
AttributeMap* attrib_map,
UniformMap* uniform_map,
VaryingMap* varying_map,
InterfaceBlockMap* interface_block_map,
OutputVariableList* output_variable_list) const override;
OptionsAffectingCompilationString*
GetStringForOptionsThatWouldAffectCompilation() const override;
void AddDestructionObserver(DestructionObserver* observer);
void RemoveDestructionObserver(DestructionObserver* observer);
private:
~ShaderTranslator() override;
ShCompileOptions GetCompileOptions() const;
ShHandle compiler_;
ShCompileOptions compile_options_;
scoped_refptr<OptionsAffectingCompilationString>
options_affecting_compilation_;
base::ObserverList<DestructionObserver>::Unchecked destruction_observers_;
};
} // namespace gles2
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_SHADER_TRANSLATOR_H_