/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * 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 
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSG_GLBeginEndAdapter
#define OSG_GLBeginEndAdapter 1

#include <osg/ref_ptr>
#include <osg/Array>
#include <osg/Matrixd>

namespace osg {

// forward declare
class State;

/** A class adapting OpenGL 1.0 glBegin()/glEnd() style code to vertex array based code */
class OSG_EXPORT GLBeginEndAdapter
{
    public:

        GLBeginEndAdapter(State* state=0);

        enum MatrixMode
        {
            APPLY_LOCAL_MATRICES_TO_VERTICES,
            APPLY_LOCAL_MATRICES_TO_MODELVIEW
        };

        void setMatrixMode(MatrixMode mode) { _mode = mode; }
        MatrixMode setMatrixMode() const { return _mode; }

        void PushMatrix();
        void PopMatrix();

        void LoadIdentity();
        void LoadMatrixd(const GLdouble* m);
        void MultMatrixd(const GLdouble* m);

        void Translated(GLdouble x, GLdouble y, GLdouble z);
        void Scaled(GLdouble x, GLdouble y, GLdouble z);
        void Rotated(GLdouble angle, GLdouble x, GLdouble y, GLdouble z);

        void Color4f(GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha);
        void Color4fv(const GLfloat* c) { Color4f(c[0], c[1], c[2], c[3]); }

        void Vertex3f(GLfloat x, GLfloat y, GLfloat z);
        void Vertex3fv(const GLfloat* v) { Vertex3f(v[0], v[1], v[2]); }

        void Normal3f(GLfloat x, GLfloat y, GLfloat z);
        void Normal3fv(const GLfloat* n) { Normal3f(n[0], n[1], n[2]); }

        void TexCoord1f(GLfloat x);
        void TexCoord1fv(const GLfloat* tc) { TexCoord1f(tc[0]); }

        void TexCoord2f(GLfloat x, GLfloat y);
        void TexCoord2fv(const GLfloat* tc) { TexCoord2f(tc[0],tc[1]); }

        void TexCoord3f(GLfloat x, GLfloat y, GLfloat z);
        void TexCoord3fv(const GLfloat* tc) { TexCoord3f(tc[0], tc[1], tc[2]); }

        void TexCoord4f(GLfloat x, GLfloat y, GLfloat z, GLfloat w);
        void TexCoord4fv(const GLfloat* tc) { TexCoord4f(tc[0], tc[1], tc[2], tc[3]); }

        void Begin(GLenum mode);
        void End();

    protected:

        State*                              _state;

        MatrixMode                          _mode;

        typedef std::list<Matrixd>           MatrixStack;
        MatrixStack                         _matrixStack;

        bool                                _normalSet;
        osg::Vec3f                          _normal;

        bool                                _colorSet;
        osg::Vec4f                          _color;

        unsigned int                        _maxNumTexCoordComponents;
        osg::Vec4f                          _texCoord;


        osg::Vec3f                          _overallNormal;
        osg::Vec4f                          _overallColor;

        GLenum                              _primitiveMode;        
        osg::ref_ptr<osg::Vec3Array>        _vertices;
        osg::ref_ptr<osg::Vec3Array>        _normals;
        osg::ref_ptr<osg::Vec4Array>        _colors;
        osg::ref_ptr<osg::Vec4Array>        _texCoords;
};


}

#endif