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78 lines
3 KiB
C++
78 lines
3 KiB
C++
#ifndef OPENMW_COMPONENTS_SHADERMANAGER_H
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#define OPENMW_COMPONENTS_SHADERMANAGER_H
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#include <string>
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#include <map>
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#include <osg/ref_ptr>
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#include <osg/Shader>
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#include <osgViewer/Viewer>
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#include <OpenThreads/Mutex>
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namespace Shader
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{
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/// @brief Reads shader template files and turns them into a concrete shader, based on a list of define's.
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/// @par Shader templates can get the value of a define with the syntax @define.
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class ShaderManager
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{
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public:
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void setShaderPath(const std::string& path);
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typedef std::map<std::string, std::string> DefineMap;
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/// Create or retrieve a shader instance.
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/// @param shaderTemplate The filename of the shader template.
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/// @param defines Define values that can be retrieved by the shader template.
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/// @param shaderType The type of shader (usually vertex or fragment shader).
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/// @note May return nullptr on failure.
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/// @note Thread safe.
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osg::ref_ptr<osg::Shader> getShader(const std::string& templateName, const DefineMap& defines, osg::Shader::Type shaderType);
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osg::ref_ptr<osg::Program> getProgram(osg::ref_ptr<osg::Shader> vertexShader, osg::ref_ptr<osg::Shader> fragmentShader);
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/// Get (a copy of) the DefineMap used to construct all shaders
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DefineMap getGlobalDefines();
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/// Set the DefineMap used to construct all shaders
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/// @param defines The DefineMap to use
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/// @note This will change the source code for any shaders already created, potentially causing problems if they're being used to render a frame. It is recommended that any associated Viewers have their threading stopped while this function is running if any shaders are in use.
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void setGlobalDefines(DefineMap & globalDefines);
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void releaseGLObjects(osg::State* state);
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const osg::ref_ptr<osg::Uniform> getShadowMapAlphaTestEnableUniform();
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const osg::ref_ptr<osg::Uniform> getShadowMapAlphaTestDisableUniform();
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private:
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std::string mPath;
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DefineMap mGlobalDefines;
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// <name, code>
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typedef std::map<std::string, std::string> TemplateMap;
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TemplateMap mShaderTemplates;
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typedef std::pair<std::string, DefineMap> MapKey;
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typedef std::map<MapKey, osg::ref_ptr<osg::Shader> > ShaderMap;
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ShaderMap mShaders;
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typedef std::map<std::pair<osg::ref_ptr<osg::Shader>, osg::ref_ptr<osg::Shader> >, osg::ref_ptr<osg::Program> > ProgramMap;
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ProgramMap mPrograms;
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OpenThreads::Mutex mMutex;
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const osg::ref_ptr<osg::Uniform> mShadowMapAlphaTestEnableUniform = new osg::Uniform();
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const osg::ref_ptr<osg::Uniform> mShadowMapAlphaTestDisableUniform = new osg::Uniform();
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};
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bool parseFors(std::string& source, const std::string& templateName);
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bool parseDefines(std::string& source, const ShaderManager::DefineMap& defines,
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const ShaderManager::DefineMap& globalDefines, const std::string& templateName);
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}
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#endif
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