/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield * Copyright (C) 2003-2005 3Dlabs Inc. Ltd. * Copyright (C) 2004-2005 Nathan Cournia * * This application is open source and may be redistributed and/or modified * freely and without restriction, both in commericial and non commericial * applications, as long as this copyright notice is maintained. * * This application is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. */ /* file: include/osg/Program * author: Mike Weiblen 2006-03-25 */ #ifndef OSG_PROGRAM #define OSG_PROGRAM 1 #include #include #include #include #include #include #include #include namespace osg { class State; /////////////////////////////////////////////////////////////////////////// /** osg::Program is an application-level abstraction of an OpenGL glProgram. * It is an osg::StateAttribute that, when applied, will activate a * glProgram for subsequent rendering. * osg::Shaders containing the actual shader source code are * attached to a Program, which will then manage the compilation, * linking, and activation of the GLSL program. * osg::Program will automatically manage per-context instancing of the * OpenGL glPrograms, if that is necessary for a particular display * configuration. */ class OSG_EXPORT Program : public osg::StateAttribute { public: Program(); /** Copy constructor using CopyOp to manage deep vs shallow copy.*/ Program(const Program& rhs, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY); META_StateAttribute(osg, Program, PROGRAM); /** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/ virtual int compare(const osg::StateAttribute& sa) const; /** If enabled, activate our program in the GL pipeline, * performing any rebuild operations that might be pending. */ virtual void apply(osg::State& state) const; virtual void compileGLObjects(osg::State& state) const; /** release OpenGL objects in specified graphics context if State object is passed, otherwise release OpenGL objects for all graphics context if State object pointer NULL.*/ virtual void releaseGLObjects(osg::State* state=0) const; /** Mark our PCSOs as needing relink */ void dirtyProgram(); /** Attach an osg::Shader to this osg::Program. * Mark Program as needing relink. Return true for success */ bool addShader( Shader* shader ); unsigned int getNumShaders() const { return _shaderList.size(); } Shader* getShader( unsigned int i ) { return _shaderList[i].get(); } const Shader* getShader( unsigned int i ) const { return _shaderList[i].get(); } /** Remove osg::Shader from this osg::Program. * Mark Program as needing relink. Return true for success */ bool removeShader( Shader* shader ); /** Add an attribute location binding. */ void addBindAttribLocation( const std::string& name, GLuint index ); /** Add an attribute location binding. */ void removeBindAttribLocation( const std::string& name ); typedef std::map AttribBindingList; const AttribBindingList& getAttribBindingList() const { return _attribBindingList; } /** Return true if this Program represents "fixed-functionality" rendering */ bool isFixedFunction() const; /** Query InfoLog from a glProgram */ bool getGlProgramInfoLog(unsigned int contextID, std::string& log) const; /** Mark internal glProgram for deletion. * Deletion requests are queued until they can be executed * in the proper GL context. */ static void deleteGlProgram(unsigned int contextID, GLuint program); /** flush all the cached glPrograms which need to be deleted * in the OpenGL context related to contextID.*/ static void flushDeletedGlPrograms(unsigned int contextID,double currentTime, double& availableTime); struct ActiveVarInfo { ActiveVarInfo() : _location(-1), _type(Uniform::UNDEFINED), _size(-1) {} ActiveVarInfo( GLint loc, GLenum type, GLint size ) : _location(loc), _type(type), _size(size) {} GLint _location; GLenum _type; GLint _size; }; typedef std::map< std::string, ActiveVarInfo > ActiveVarInfoMap; const ActiveVarInfoMap& getActiveUniforms(unsigned int contextID) const; const ActiveVarInfoMap& getActiveAttribs(unsigned int contextID) const; public: // make PerContextProgram a friend to allow it access Program's protected // methods and member variables. class PerContextProgram; friend class PerContextProgram; /** PerContextProgram (PCP) is an OSG-internal encapsulation of glPrograms per-GL context. */ class OSG_EXPORT PerContextProgram : public osg::Referenced { public: PerContextProgram(const Program* program, unsigned int contextID); GLuint getHandle() const {return _glProgramHandle;} void requestLink(); void linkProgram(); bool validateProgram(); bool needsLink() const {return _needsLink;} bool isLinked() const {return _isLinked;} bool getInfoLog( std::string& infoLog ) const; void useProgram() const; void resetAppliedUniforms() const { for(LastAppliedUniformList::iterator itr=_lastAppliedUniformList.begin(); itr!=_lastAppliedUniformList.end(); ++itr) { (*itr).first = 0; (*itr).second = 0; } } inline void apply(const Uniform& uniform) const { GLint location = getUniformLocation(uniform.getName()); if (location>=0) { if ((unsigned int)location>=_lastAppliedUniformList.size()) _lastAppliedUniformList.resize(location+1); const Uniform* lastAppliedUniform = _lastAppliedUniformList[location].first; if (lastAppliedUniform != &uniform) { // new attribute uniform.apply(_extensions.get(),location); _lastAppliedUniformList[location].first = &uniform; _lastAppliedUniformList[location].second = uniform.getModifiedCount(); } else if (_lastAppliedUniformList[location].second != uniform.getModifiedCount()) { // existing attribute has been modified uniform.apply(_extensions.get(),location); _lastAppliedUniformList[location].first = &uniform; _lastAppliedUniformList[location].second = uniform.getModifiedCount(); } } } const ActiveVarInfoMap& getActiveUniforms() const {return _uniformInfoMap;} const ActiveVarInfoMap& getActiveAttribs() const {return _attribInfoMap;} inline GLint getUniformLocation( const std::string& name ) const { ActiveVarInfoMap::const_iterator itr = _uniformInfoMap.find(name); return (itr!=_uniformInfoMap.end()) ? itr->second._location : -1; } inline GLint getAttribLocation( const std::string& name ) const { ActiveVarInfoMap::const_iterator itr = _attribInfoMap.find(name); return (itr!=_attribInfoMap.end()) ? itr->second._location : -1; } protected: /*methods*/ ~PerContextProgram(); protected: /*data*/ /** Pointer to our parent Program */ const Program* _program; /** Pointer to this context's extension functions */ osg::ref_ptr _extensions; /** Handle to the actual OpenGL glProgram */ GLuint _glProgramHandle; /** Does our glProgram need to be linked? */ bool _needsLink; /** Is our glProgram successfully linked? */ bool _isLinked; const unsigned int _contextID; ActiveVarInfoMap _uniformInfoMap; ActiveVarInfoMap _attribInfoMap; typedef std::pair UniformModifiedCountPair; typedef std::vector LastAppliedUniformList; mutable LastAppliedUniformList _lastAppliedUniformList; private: PerContextProgram(); // disallowed PerContextProgram(const PerContextProgram&); // disallowed PerContextProgram& operator=(const PerContextProgram&); // disallowed }; /** Get the PCP for a particular GL context */ PerContextProgram* getPCP(unsigned int contextID) const; protected: /*methods*/ virtual ~Program(); protected: /*data*/ mutable osg::buffered_value< osg::ref_ptr > _pcpList; AttribBindingList _attribBindingList; typedef std::vector< ref_ptr > ShaderList; ShaderList _shaderList; private: Program& operator=(const Program&); // disallowed }; } #endif /*EOF*/