/*
 * This source file is part of KEOS (Free 3D Engine)
 * For the latest info, see http://www.keosengine.org/
 * E-mails : thierry.vouriot@keosengine.org, yeri@keosengine.org
 * 
 * This program 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 2 of the License, or (at your option) any later
 * version.
 *
 * This program 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
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307, USA, or go to
 * http://www.gnu.org/copyleft/lesser.txt.
 *
 */
#ifndef KEOS_SHADERBASE_H
#define KEOS_SHADERBASE_H

#include "KeosEnums.h"
#include "KeosResource.h"
#include "KeosMatrix4.h"
#include "Cg/cg.h"

namespace Keos
{
    //-----------------------------------------------------------------------
    /** Base class for textures.
     *
     */
    class KEOS_EXPORT IShaderBase : public IResource
    {
    public :

        /** Construct the shader from a program Cg.
         *  @param Program Cg program.
         *  @param Type Shader type.
         */
        IShaderBase(CGprogram Program, TShaderType Type);

        /** Destructor.
         */
        virtual ~IShaderBase();

        /** Return the shader type.
         */
        TShaderType GetType() const;

        /** Change a parameter of the shader (scalar or vector).
         *  @param strName Name of the parameter in the shader.
         *  @param pValue Value(s) to be sent.
         */
        virtual void SetParameter(const String& strName, const float* pValue) = 0;

        /** Change a parameter of the shader (matrix4).
         *  @param strName Name of the parameter in the shader.
         *  @param Value Value to be sent.
         */
        virtual void SetParameter(const String& strName, const CMatrix4& Value) = 0;

    protected :

        /** Get the CGparameter associated to an identifier.
         *  @param strName Parameter name.
         *  @return The CGparameter associated to the parameter.
         */
        CGparameter GetParameter(const String& strName) const;

        //! Program Cg associated to the shader
        CGprogram   m_Program;
        //! Shader type (vrtex / pixel)
        TShaderType m_Type;
    };

} // namespace Keos

#endif // KEOS_SHADERBASE_H
