glc_shader.h

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/****************************************************************************

 This file is part of the GLC-lib library.
 Copyright (C) 2005-2008 Laurent Ribon (laumaya@users.sourceforge.net)
 http://glc-lib.sourceforge.net

 GLC-lib is free software; you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation; either version 3 of the License, or
 (at your option) any later version.

 GLC-lib 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 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public License
 along with GLC-lib; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

*****************************************************************************/


#ifndef GLC_SHADER_H_
#define GLC_SHADER_H_

#include "../glc_global.h"
#include <QGLShader>
#include <QGLShaderProgram>
#include <QStack>
#include <QFile>
#include <QMutex>
#include <QString>

#include "../glc_config.h"



class GLC_LIB_EXPORT GLC_Shader
{


public:
        GLC_Shader();

        GLC_Shader(QFile&, QFile&);

        GLC_Shader(const GLC_Shader&);

        ~GLC_Shader();



public:
        inline GLuint id() const
        {return m_ProgramShaderId;}

        inline bool isUsable() const
        {return m_ProgramShader.isLinked();}

        bool canBeDeleted() const;

        inline QString name() const
        {return m_Name;}

        inline QGLShaderProgram* programShaderHandle()
        {return &m_ProgramShader;}

        static int shaderCount();

        static bool asShader(GLC_uint shadingGroupId);


        static GLC_Shader* shaderHandle(GLC_uint shadingGroupId);

        static bool hasActiveShader();


        static GLC_Shader* currentShaderHandle();



public:
        void setVertexAndFragmentShader(QFile&, QFile&);

        /* If this shader is usable replacing shader must be usable*/
        void replaceShader(const GLC_Shader&);

        inline GLC_Shader& operator=(const GLC_Shader& shader)
        {
                replaceShader(shader);
                return *this;
        }

        inline void setName(const QString& name)
        {m_Name= name;}




public:

        void use();


        static bool use(GLuint ShadingGroupId);

        static void unuse();


        void createAndCompileProgrammShader();

        void deleteShader();

// private members
private:
        static QStack<GLC_uint> m_ShadingGroupStack;

        static GLC_uint m_CurrentShadingGroupId;

        static QHash<GLC_uint, GLC_Shader*> m_ShaderProgramHash;

        QGLShader m_VertexShader;

        QGLShader m_FragmentShader;

        QGLShaderProgram m_ProgramShader;

        GLC_uint m_ProgramShaderId;

        QString m_Name;

};

#endif /*GLC_SHADER_H_*/