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127 lines
4.2 KiB
C++
127 lines
4.2 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef GPU_COMMAND_BUFFER_SERVICE_SHADER_TRANSLATOR_H_
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#define GPU_COMMAND_BUFFER_SERVICE_SHADER_TRANSLATOR_H_
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#include <string>
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#include "base/basictypes.h"
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#include "base/containers/hash_tables.h"
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#include "base/memory/ref_counted.h"
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#include "base/memory/scoped_ptr.h"
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#include "base/observer_list.h"
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#include "gpu/gpu_export.h"
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#include "third_party/angle/include/GLSLANG/ShaderLang.h"
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namespace gpu {
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namespace gles2 {
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// Mapping between variable name and info.
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typedef base::hash_map<std::string, sh::Attribute> AttributeMap;
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typedef base::hash_map<std::string, sh::Uniform> UniformMap;
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typedef base::hash_map<std::string, sh::Varying> VaryingMap;
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// Mapping between hashed name and original name.
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typedef base::hash_map<std::string, std::string> NameMap;
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// Translates a GLSL ES 2.0 shader to desktop GLSL shader, or just
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// validates GLSL ES 2.0 shaders on a true GLSL ES implementation.
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class ShaderTranslatorInterface
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: public base::RefCounted<ShaderTranslatorInterface> {
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public:
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ShaderTranslatorInterface() {}
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enum GlslImplementationType {
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kGlsl,
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kGlslES
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};
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// Initializes the translator.
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// Must be called once before using the translator object.
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virtual bool Init(
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sh::GLenum shader_type,
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ShShaderSpec shader_spec,
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const ShBuiltInResources* resources,
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GlslImplementationType glsl_implementation_type,
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ShCompileOptions driver_bug_workarounds) = 0;
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// Translates the given shader source.
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// Returns true if translation is successful, false otherwise.
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// Always fill |info_log| if it's non-null.
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// Upon success, fill |translated_shader|, |attrib_map|, |uniform_map|,
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// |varying_map|, and |name_map| if they are non-null.
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virtual bool Translate(const std::string& shader_source,
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std::string* info_log,
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std::string* translated_shader,
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AttributeMap* attrib_map,
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UniformMap* uniform_map,
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VaryingMap* varying_map,
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NameMap* name_map) const = 0;
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// Return a string that is unique for a specfic set of options that would
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// possibly affect compilation.
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virtual std::string GetStringForOptionsThatWouldAffectCompilation() const = 0;
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protected:
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virtual ~ShaderTranslatorInterface() {}
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private:
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friend class base::RefCounted<ShaderTranslatorInterface>;
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DISALLOW_COPY_AND_ASSIGN(ShaderTranslatorInterface);
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};
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// Implementation of ShaderTranslatorInterface
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class GPU_EXPORT ShaderTranslator
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: NON_EXPORTED_BASE(public ShaderTranslatorInterface) {
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public:
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class DestructionObserver {
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public:
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DestructionObserver();
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virtual ~DestructionObserver();
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virtual void OnDestruct(ShaderTranslator* translator) = 0;
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private:
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DISALLOW_COPY_AND_ASSIGN(DestructionObserver);
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};
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ShaderTranslator();
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// Overridden from ShaderTranslatorInterface.
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bool Init(sh::GLenum shader_type,
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ShShaderSpec shader_spec,
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const ShBuiltInResources* resources,
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GlslImplementationType glsl_implementation_type,
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ShCompileOptions driver_bug_workarounds) override;
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// Overridden from ShaderTranslatorInterface.
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bool Translate(const std::string& shader_source,
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std::string* info_log,
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std::string* translated_source,
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AttributeMap* attrib_map,
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UniformMap* uniform_map,
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VaryingMap* varying_map,
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NameMap* name_map) const override;
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std::string GetStringForOptionsThatWouldAffectCompilation() const override;
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void AddDestructionObserver(DestructionObserver* observer);
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void RemoveDestructionObserver(DestructionObserver* observer);
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private:
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~ShaderTranslator() override;
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int GetCompileOptions() const;
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ShHandle compiler_;
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bool implementation_is_glsl_es_;
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ShCompileOptions driver_bug_workarounds_;
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base::ObserverList<DestructionObserver> destruction_observers_;
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};
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} // namespace gles2
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} // namespace gpu
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#endif // GPU_COMMAND_BUFFER_SERVICE_SHADER_TRANSLATOR_H_
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