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/* -*-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_GLU
#define OSG_GLU 1

#include <osg/GL>

namespace osg
{

/* Pixel storage modes, used by gluScaleImage */
struct OSG_EXPORT PixelStorageModes
{
    // sets defaults as per glGet docs in OpenGL red book
    PixelStorageModes();

    // use glGet's to retrieve all the current settings
    void retrieveStoreModes();

    // use glGet's to retrieve all the current 3D settings
    void retrieveStoreModes3D();

    GLint pack_alignment;
    GLint pack_row_length;
    GLint pack_skip_rows;
    GLint pack_skip_pixels;
    GLint pack_lsb_first;
    GLint pack_swap_bytes;
    GLint pack_skip_images;
    GLint pack_image_height;

    GLint unpack_alignment;
    GLint unpack_row_length;
    GLint unpack_skip_rows;
    GLint unpack_skip_pixels;
    GLint unpack_lsb_first;
    GLint unpack_swap_bytes;
    GLint unpack_skip_images;
    GLint unpack_image_height;
} ;

extern OSG_EXPORT const GLubyte * gluErrorString (GLenum error);

/** OSG specific gluScaleImage function that allows you to pass in the PixelStoreModes, which
  * enables the code to avoid glGet's that are associated with the conventional gluScaleImage function.
  * Avoiding glGet's allows this gluScaleImage function to be called at any time, from any thread, there
  * is no need to have a graphics context current.*/
extern OSG_EXPORT GLint gluScaleImage (PixelStorageModes* psm, GLenum format, GLsizei wIn, GLsizei hIn, GLenum typeIn, const void *dataIn, GLsizei wOut, GLsizei hOut, GLenum typeOut, GLvoid* dataOut);

/** Traditional GLU gluScaleImage function that sets up the PixelStoreModes automatically by doing glGets.;
  * The use of glGet's means that you can only call this function from a thread with a valid graphics context.
  * The use of glGet's will also result in lower performance due to the round trip to the OpenGL driver.*/
extern OSG_EXPORT GLint gluScaleImage (GLenum format, GLsizei wIn, GLsizei hIn, GLenum typeIn, const void *dataIn, GLsizei wOut, GLsizei hOut, GLenum typeOut, GLvoid* dataOut);

extern OSG_EXPORT GLint gluBuild1DMipmapLevels (GLenum target, GLint internalFormat, GLsizei width, GLenum format, GLenum type, GLint level, GLint base, GLint max, const void *data);
extern OSG_EXPORT GLint gluBuild1DMipmaps (GLenum target, GLint internalFormat, GLsizei width, GLenum format, GLenum type, const void *data);
extern OSG_EXPORT GLint gluBuild2DMipmapLevels (GLenum target, GLint internalFormat, GLsizei width, GLsizei height, GLenum format, GLenum type, GLint level, GLint base, GLint max, const void *data);
extern OSG_EXPORT GLint gluBuild2DMipmaps (GLenum target, GLint internalFormat, GLsizei width, GLsizei height, GLenum format, GLenum type, const void *data);

typedef void (GL_APIENTRY * GLTexImage3DProc)      ( GLenum target, GLint level, GLenum internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, const GLvoid *pixels);

/** Small variation on normal gluBuild3DMipmapLevels as we pass in the function pointer to glTexImage3D rather than rely on GLU style query for this function pointer.*/
extern OSG_EXPORT GLint gluBuild3DMipmapLevels (GLTexImage3DProc glTextImage3DProc, GLenum target, GLint internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, GLint level, GLint base, GLint max, const void *data);

/** Small variation on normal gluBuild3DMipmapLevels as we pass in the function pointer to glTexImage3D rather than rely on GLU style query for this function pointer.*/
extern OSG_EXPORT GLint gluBuild3DMipmaps (GLTexImage3DProc glTextImage3DProc, GLenum target, GLint internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, const void *data);

/* ErrorCode */
#define GLU_INVALID_ENUM                   100900
#define GLU_INVALID_VALUE                  100901
#define GLU_OUT_OF_MEMORY                  100902
#define GLU_INCOMPATIBLE_GL_VERSION        100903
#define GLU_INVALID_OPERATION              100904

/* Boolean */
#define GLU_FALSE                          0
#define GLU_TRUE                           1

/* QuadricDrawStyle */
#define GLU_POINT                          100010
#define GLU_LINE                           100011
#define GLU_FILL                           100012
#define GLU_SILHOUETTE                     100013

/* QuadricCallback */
/*      GLU_ERROR */

/* QuadricNormal */
#define GLU_SMOOTH                         100000
#define GLU_FLAT                           100001
#define GLU_NONE                           100002

/* QuadricOrientation */
#define GLU_OUTSIDE                        100020
#define GLU_INSIDE                         100021

/* TessCallback */
#define GLU_TESS_BEGIN                     100100
#define GLU_BEGIN                          100100
#define GLU_TESS_VERTEX                    100101
#define GLU_VERTEX                         100101
#define GLU_TESS_END                       100102
#define GLU_END                            100102
#define GLU_TESS_ERROR                     100103
#define GLU_TESS_EDGE_FLAG                 100104
#define GLU_EDGE_FLAG                      100104
#define GLU_TESS_COMBINE                   100105
#define GLU_TESS_BEGIN_DATA                100106
#define GLU_TESS_VERTEX_DATA               100107
#define GLU_TESS_END_DATA                  100108
#define GLU_TESS_ERROR_DATA                100109
#define GLU_TESS_EDGE_FLAG_DATA            100110
#define GLU_TESS_COMBINE_DATA              100111

/* TessContour */
#define GLU_CW                             100120
#define GLU_CCW                            100121
#define GLU_INTERIOR                       100122
#define GLU_EXTERIOR                       100123
#define GLU_UNKNOWN                        100124

/* TessProperty */
#define GLU_TESS_WINDING_RULE              100140
#define GLU_TESS_BOUNDARY_ONLY             100141
#define GLU_TESS_TOLERANCE                 100142

/* TessError */
#define GLU_TESS_ERROR1                    100151
#define GLU_TESS_ERROR2                    100152
#define GLU_TESS_ERROR3                    100153
#define GLU_TESS_ERROR4                    100154
#define GLU_TESS_ERROR5                    100155
#define GLU_TESS_ERROR6                    100156
#define GLU_TESS_ERROR7                    100157
#define GLU_TESS_ERROR8                    100158
#define GLU_TESS_MISSING_BEGIN_POLYGON     100151
#define GLU_TESS_MISSING_BEGIN_CONTOUR     100152
#define GLU_TESS_MISSING_END_POLYGON       100153
#define GLU_TESS_MISSING_END_CONTOUR       100154
#define GLU_TESS_COORD_TOO_LARGE           100155
#define GLU_TESS_NEED_COMBINE_CALLBACK     100156

/* TessWinding */
#define GLU_TESS_WINDING_ODD               100130
#define GLU_TESS_WINDING_NONZERO           100131
#define GLU_TESS_WINDING_POSITIVE          100132
#define GLU_TESS_WINDING_NEGATIVE          100133
#define GLU_TESS_WINDING_ABS_GEQ_TWO       100134

struct GLUtesselator;
typedef GLUtesselator GLUtesselatorObj;
typedef GLUtesselator GLUtriangulatorObj;

#define GLU_TESS_MAX_COORD 1.0e150

/* Internal convenience typedefs */
typedef void (GL_APIENTRY * _GLUfuncptr)();
typedef void (GL_APIENTRY * GLU_TESS_CALLBACK)();

extern OSG_EXPORT GLUtesselator* GL_APIENTRY gluNewTess (void);
extern OSG_EXPORT void GL_APIENTRY gluDeleteTess (GLUtesselator* tess);

extern OSG_EXPORT void GL_APIENTRY gluTessBeginContour (GLUtesselator* tess);
extern OSG_EXPORT void GL_APIENTRY gluTessCallback (GLUtesselator* tess, GLenum which, _GLUfuncptr CallBackFunc);
extern OSG_EXPORT void GL_APIENTRY gluTessEndContour (GLUtesselator* tess);
extern OSG_EXPORT void GL_APIENTRY gluTessNormal (GLUtesselator* tess, GLdouble valueX, GLdouble valueY, GLdouble valueZ);
extern OSG_EXPORT void GL_APIENTRY gluTessProperty (GLUtesselator* tess, GLenum which, GLdouble data);
extern OSG_EXPORT void GL_APIENTRY gluTessVertex (GLUtesselator* tess, GLdouble *location, GLvoid* data);
extern OSG_EXPORT void GL_APIENTRY gluTessBeginPolygon (GLUtesselator* tess, GLvoid* data);
extern OSG_EXPORT void GL_APIENTRY gluTessEndPolygon (GLUtesselator* tess);
extern OSG_EXPORT void GL_APIENTRY gluGetTessProperty( GLUtesselator *tess, GLenum which, GLdouble *value );

}

#endif  // __osgGLU_h

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