/*
 ** License Applicability. Except to the extent portions of this file are
 ** made subject to an alternative license as permitted in the SGI Free
 ** Software License B, Version 1.1 (the "License"), the contents of this
 ** file are subject only to the provisions of the License. You may not use
 ** this file except in compliance with the License. You may obtain a copy
 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
 **
 ** http://oss.sgi.com/projects/FreeB
 **
 ** Note that, as provided in the License, the Software is distributed on an
 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
 **
 ** Original Code. The Original Code is: OpenGL Sample Implementation,
 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
 ** Copyright in any portions created by third parties is as indicated
 ** elsewhere herein. All Rights Reserved.
 **
 ** Additional Notice Provisions: The application programming interfaces
 ** established by SGI in conjunction with the Original Code are The
 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
 ** Window System(R) (Version 1.3), released October 19, 1998. This software
 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
 ** published by SGI, but has not been independently verified as being
 ** compliant with the OpenGL(R) version 1.2.1 Specification.
 */

/*
 * glcurveval.h
 *
 */

#ifndef __gluglcurveval_h_
#define __gluglcurveval_h_

#include "gluos.h"
#include <GL/gl.h>
#include <GL/glu.h>
#include "basiccrveval.h"

class CurveMap;

/*for internal evaluator callback stuff*/
#ifndef IN_MAX_BEZIER_ORDER
#define IN_MAX_BEZIER_ORDER 40 /*XXX should be bigger than machine order*/
#endif

#ifndef IN_MAX_DIMENSION
#define IN_MAX_DIMENSION 4 
#endif

typedef struct curveEvalMachine{
	REAL uprime; //cached previously evaluated uprime
	int k; //the dimension
	REAL u1;
	REAL u2;
	int ustride;
	int uorder;
	REAL ctlpoints[IN_MAX_BEZIER_ORDER*IN_MAX_DIMENSION];
	REAL ucoeff[IN_MAX_BEZIER_ORDER];//cache the polynomial values
} curveEvalMachine;

class OpenGLCurveEvaluator : public BasicCurveEvaluator  {  
public:
	OpenGLCurveEvaluator();
	virtual ~OpenGLCurveEvaluator(void);
	void		range1f(long, REAL *, REAL *);
	void		domain1f(REAL, REAL);
	void		addMap(CurveMap *);

	void		enable(long);
	void		disable(long);
	void		bgnmap1f(long);
	void		map1f(long, REAL, REAL, long, long, REAL *);
	void		mapgrid1f(long, REAL, REAL);
	void		mapmesh1f(long, long, long);
	void		evalpoint1i(long);
	void		evalcoord1f(long, REAL);
	void		endmap1f(void);

	void		bgnline(void);
	void		endline(void);

	void                put_vertices_call_back(int flag)
	{
		output_triangles = flag;
	}
#ifdef _WIN32
	void               putCallBack(GLenum which, void (APIENTRY *fn)() );
#else
	void               putCallBack(GLenum which, _GLUfuncptr fn );
#endif
	void               set_callback_userData(void *data)
	{
		userData = data;
	}

	/*------------------begin for curveEvalMachine------------*/
	curveEvalMachine em_vertex;
	curveEvalMachine em_normal;
	curveEvalMachine em_color;
	curveEvalMachine em_texcoord;
	int vertex_flag; //whether there is a vertex map or not
	int normal_flag; //whether there is a normal map or not
	int color_flag; //whether there is a color map or not
	int texcoord_flag; //whether there is a texture map or not

	REAL global_grid_u0;
	REAL global_grid_u1;
	int global_grid_nu;

	void inMap1f(int which, //0: vert, 1: norm, 2: color, 3: tex
			int dimension,
			REAL ulower,
			REAL uupper,
			int ustride,
			int uorder,
			REAL *ctlpoints);

	void inPreEvaluate(int order, REAL vprime, REAL *coeff);
	void inDoDomain1(curveEvalMachine *em, REAL u, REAL *retPoint);
	void inDoEvalCoord1(REAL u);
	void inMapMesh1f(int umin, int umax);

	void     (GLAPIENTRY *beginCallBackN) (GLenum type);
	void     (GLAPIENTRY *endCallBackN)   (void);
	void     (GLAPIENTRY *vertexCallBackN) (const GLfloat *vert);
	void     (GLAPIENTRY *normalCallBackN) (const GLfloat *normal);
	void     (GLAPIENTRY *colorCallBackN) (const GLfloat *color);
	void     (GLAPIENTRY *texcoordCallBackN) (const GLfloat *texcoord);

	void     (GLAPIENTRY *beginCallBackData) (GLenum type, void* data);
	void     (GLAPIENTRY *endCallBackData)   (void* data);
	void     (GLAPIENTRY *vertexCallBackData) (const GLfloat *vert, void* data);
	void     (GLAPIENTRY *normalCallBackData) (const GLfloat *normal, void* data);
	void     (GLAPIENTRY *colorCallBackData) (const GLfloat *color, void* data);
	void     (GLAPIENTRY *texcoordCallBackData) (const GLfloat *texcoord, void* data);

	void* userData; //the opaque pointer for Data callback functions
	void  beginCallBack(GLenum type, void* data);
	void endCallBack(void* data);
	void vertexCallBack(const GLfloat *vert, void *data);
	void normalCallBack(const GLfloat *normal, void* data);
	void colorCallBack(const  GLfloat *color, void* data);
	void texcoordCallBack(const GLfloat *texcoord, void* data);


	/*------------------end   for curveEvalMachine------------*/

	void setIFace (GLContextIFace *Self)
	{
		m_Self = Self;
	};
	
	struct GLContextIFace *m_Self;
private:
	int output_triangles; //true 1; false 0
};

#endif /* __gluglcurveval_h_ */