GLSLProgram.h

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////////////////////////////////////////////////////////////////////////////////
//    Scorched3D (c) 2000-2009
//
//    This file is part of Scorched3D.
//
//    Scorched3D is free software; you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation; either version 2 of the License, or
//    (at your option) any later version.
//
//    Scorched3D 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.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with Scorched3D; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

#if !defined(__INCLUDE_GLSLProgramh_INCLUDE__)
#define __INCLUDE_GLSLProgramh_INCLUDE__

#include <list>
#include <string>
#include <GLSL/GLSLShader.h>
#include <GLEXT/GLTexture.h>
#include <GLEXT/GLShadowFrameBuffer.h>
#include <common/Vector.h>

/// this class handles an OpenGL GLSL Program, that is a link unit of shaders.
///@note needs OpenGL 2.0
class GLSLProgram
{
public:
        GLSLProgram();
        ~GLSLProgram();

        /// attach a shader
        void attach(GLSLShader &s);

        /// attach a shader
        void detach(GLSLShader &s);

        /// link program after all shaders are attached
        void link();

        /// use this program
        ///@note link program before using it!
        void use() const;

        /// use fixed function pipeline instead of particular program
        static void use_fixed();

        /// set up texture for a particular shader name
        void set_gl_texture(GLTexture& tex, const char *texName, unsigned texunit) const;
        void set_gl_texture(GLShadowFrameBuffer &tex, const char *texName, unsigned texunit) const;
        void set_gl_texture_unit(const char *texname, unsigned texunit) const;

        /// set uniform variable
        void set_uniform(const char *name, const Vector& value) const;
        void set_uniform(const char *name, const float value) const;

        /// get vertex attribute index
        unsigned get_vertex_attrib_index(const char *name) const;

 protected:
        unsigned int id_;
        bool linked_;
        std::list<GLSLShader*> attached_shaders_;
        static const GLSLProgram* used_program_;

 private:
        GLSLProgram(const GLSLProgram&);
        GLSLProgram& operator= (const GLSLProgram&);
};

#endif // __INCLUDE_GLSLProgramh_INCLUDE__

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