VRS - The Virtual Rendering System

version 3.3

shaderprogramgl.h

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/******************************************************************************
 * VRS - The Virtual Rendering System
 * Copyright (C) 2003 Computer Graphics Systems Group at the 
 * Hasso-Plattner-Institute (HPI), Potsdam, Germany.
 *
 * This  library  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 2.1 of the License, or (at
 * your option) any later version. This library  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 library; if
 * not, write to the FreeSoftware Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA, 02111-1307, USA.
 ******************************************************************************/

// $Id: shaderprogramgl.h 6014 2007-08-09 07:51:16Z Konstantin_Baumann $
// $Date: 2007-08-09 09:51:16 +0200 (Thu, 09 Aug 2007) $
// $Revision: 6014 $
// $State$
// $Author: Konstantin_Baumann $
//
// $Log$
// Revision 1.6  2005/01/03 01:43:09  klimetschek
// - modified win32 project layout, splitted vrs.vcproj into vrs_container, vrs_core, vrs_sg, vrs_image, vrs_opengl and vrs_io
// - removed vrs.vcproj
// minor things:
// - added all glutexamples to vrs4glut.sln
// - fixed some problems in glutexamples
// - removed all project references from all VS projects (using solution wide project dependencies instead)
//
// Revision 1.5  2004/11/03 14:45:06  saar
// Class comment changed (Doxygen style)
//
// Revision 1.4  2004/03/12 16:28:40  baumann
// macros VRS_NAMESPACE_BEGIN/_END expanded and removed
//
// Revision 1.3  2004/01/19 11:43:58  baumann
// serialization mechanism improved
//
// Revision 1.2  2003/11/07 14:19:25  kirsch
// removed leading underscore from include guards
//
// Revision 1.1  2003/06/06 16:30:09  kirsch
// - added ShaderProgramGL as common base class for ARB vertex and fragment programs
// - added FragmenProgramGL
// - added ShaderProgramPainterGL (painter for VertexProgramGL and FragmentProgramGL)
// - removed VertexProgramPainterGL
// - changed interface of ARB and NVidia program IDs in shared context
//
// Revision 1.1  2003/05/28 14:29:45  kirsch
// added VertexProgramGL for ARB vertex programs, and corresponding painter
//

#ifndef VRS_OPENGL_SHADERPROGRAMGL_H_
#define VRS_OPENGL_SHADERPROGRAMGL_H_

#include <vrs/monoattribute.h>
#include <vrs/container/array.h>

namespace VRS {

class VRS_CORE_API ShaderProgramGL : public MonoAttribute {
public:
    ShaderProgramGL(const char* program = "");
    void setProgram(const char* program);
    const char* getProgram() const;
    struct Parameter {
        Parameter(double x, double y, double z, double w, unsigned int targetRegister) 
            :  reg(targetRegister) {  param[0] = x; param[1] = y; param[2] = z; param[3] = w; }
        double param[4];
        unsigned int reg;
    };

    void setLocalParameter(double x, double y, double z, double w, unsigned int targetRegister);
    Iterator<Parameter*>* localParameter() const;

    VRS_TYPEINFO(ShaderProgramGL, MonoAttribute);
    VRS_SERIALIZABLE(ShaderProgramGL);

private:
    // the ShaderProgramPainterGL must be able to modify lastChange_ and lastUpdate_
    friend class ShaderProgramPainterGL;

    std::string str_;
    SO<NonPersistentArray<Parameter*> > params_;

    TransactionNo lastChange_; // changing a vertex or fragment program is costly, so we update 
                               // lastChange_ only when the program string is changed
    TransactionNo lastUpdate_; // updated by the painter, when the program id has been created
};

} // namespace VRS

#endif // VRS_OPENGL_SHADERPROGRAMGL_H_

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