types.h

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/* $Id: types.h,v 1.50 1998/02/03 23:45:36 brianp Exp $ */

/*
 * Mesa 3-D graphics library
 * Version:  2.6
 * Copyright (C) 1995-1997  Brian Paul
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


/*
 * $Log: types.h,v $
 * Revision 1.50  1998/02/03 23:45:36  brianp
 * added space parameter to clip interpolation functions
 *
 * Revision 1.49  1998/01/06 02:40:52  brianp
 * added DavidB's clipping interpolation optimization
 *
 * Revision 1.48  1997/12/31 06:10:03  brianp
 * added Henk Kok's texture validation optimization (AnyDirty flag)
 *
 * Revision 1.47  1997/12/06 18:06:50  brianp
 * moved several static display list vars into GLcontext
 *
 * Revision 1.46  1997/10/29 01:33:29  brianp
 * added DriverMgrCtx field to gl_context struct
 *
 * Revision 1.45  1997/10/29 01:29:09  brianp
 * added GL_EXT_point_parameters extension from Daniel Barrero
 *
 * Revision 1.44  1997/10/16 01:59:08  brianp
 * added GL_EXT_shared_texture_palette extension
 *
 * Revision 1.43  1997/10/16 01:13:03  brianp
 * removed teximage Dirty, DirtyPalette flags, mondello code
 *
 * Revision 1.42  1997/09/29 23:27:08  brianp
 * added Dirty and DriverData fields for texturing
 *
 * Revision 1.41  1997/09/27 00:13:44  brianp
 * added GL_EXT_paletted_texture extension
 *
 * Revision 1.40  1997/09/23 00:57:38  brianp
 * now using hash table for texture objects
 *
 * Revision 1.39  1997/09/22 02:33:58  brianp
 * display lists now implemented with hash table
 *
 * Revision 1.38  1997/08/13 01:30:55  brianp
 * LightTwoSide is now a GLboolean
 *
 * Revision 1.37  1997/08/01 02:23:27  brianp
 * removed unused gl_list_group struct
 *
 * Revision 1.36  1997/06/20 02:07:50  brianp
 * replaced Current.IntColor with Current.ByteColor
 * removed ColorShift field
 *
 * Revision 1.35  1997/06/20 02:02:37  brianp
 * added Color4ubv API pointer
 *
 * Revision 1.34  1997/05/31 16:57:14  brianp
 * added MESA_NO_RASTER env var support
 *
 * Revision 1.33  1997/05/28 04:06:03  brianp
 * implemented projection near/far value stack for Driver.NearFar() function
 *
 * Revision 1.32  1997/05/26 21:15:13  brianp
 * added Red/Green/Blue/AlphaBits to GLvisual struct
 *
 * Revision 1.31  1997/05/03 00:49:31  brianp
 * added SampleFunc, Current, and Dirty to gl_texture_object
 *
 * Revision 1.30  1997/05/01 02:07:35  brianp
 * added shared state variable NextFreeTextureName
 *
 * Revision 1.29  1997/04/24 01:50:53  brianp
 * optimized glColor3f, glColor3fv, glColor4fv
 *
 * Revision 1.28  1997/04/21 01:20:41  brianp
 * added MATRIX_2D_NO_ROT
 *
 * Revision 1.27  1997/04/20 16:18:15  brianp
 * added glOrtho and glFrustum API pointers
 *
 * Revision 1.26  1997/04/16 23:55:33  brianp
 * added optimized glTexCoord2f code
 *
 * Revision 1.25  1997/04/14 22:18:23  brianp
 * added optimized glVertex3fv code
 *
 * Revision 1.24  1997/04/14 02:03:05  brianp
 * added MinMagThresh to texture object
 *
 * Revision 1.23  1997/04/12 16:54:05  brianp
 * new NEW_POLYGON state flag
 *
 * Revision 1.22  1997/04/12 12:26:39  brianp
 * added quad_func and rect_func, removed polygon_func
 *
 * Revision 1.21  1997/04/07 02:57:13  brianp
 * added API.Vertex[23] functions
 *
 * Revision 1.20  1997/04/01 04:19:37  brianp
 * added API pointer for glLoadIdentity
 * added matrix type constants and fields
 *
 * Revision 1.19  1997/03/13 03:05:54  brianp
 * changed AlphaRefInt to AlphaRefUbyte
 *
 * Revision 1.18  1997/03/04 19:17:38  brianp
 * added a few members to gl_texture_image struct
 *
 * Revision 1.17  1997/02/10 19:49:29  brianp
 * added glResizeBuffersMESA() code
 *
 * Revision 1.16  1997/02/09 19:53:43  brianp
 * now use TEXTURE_xD enable constants
 *
 * Revision 1.15  1997/02/09 18:42:41  brianp
 * added GL_EXT_texture3D support
 *
 * Revision 1.14  1997/01/28 22:14:36  brianp
 * now there's separate state for CI and RGBA logic op enabled
 *
 * Revision 1.13  1997/01/21 03:09:41  brianp
 * added definition:  union node;
 *
 * Revision 1.12  1997/01/09 21:26:23  brianp
 * added RefCount to gl_image struct
 *
 * Revision 1.11  1996/12/18 20:01:39  brianp
 * added material bitmask constants and ColorMaterialBitmask
 *
 * Revision 1.10  1996/12/11 20:16:30  brianp
 * changed GLaccum types to signed
 *
 * Revision 1.9  1996/11/08 02:21:04  brianp
 * added NoRaster flag to context
 *
 * Revision 1.8  1996/11/07 04:11:34  brianp
 * now pass gl_image struct pointer to glTexImage[12]D()
 *
 * Revision 1.7  1996/11/06 04:21:58  brianp
 * added Format to struct gl_image
 *
 * Revision 1.6  1996/10/11 03:41:12  brianp
 * removed OffsetBias field
 *
 * Revision 1.5  1996/10/11 00:23:04  brianp
 * changed Polygon/Line/PointZoffset to GLfloat
 *
 * Revision 1.4  1996/09/25 03:22:53  brianp
 * added NO_DRAW_BIT for glDrawBuffer(GL_NONE)
 *
 * Revision 1.3  1996/09/19 03:17:56  brianp
 * removed Window field from struct gl_frame_buffer
 *
 * Revision 1.2  1996/09/15 14:20:54  brianp
 * added GLframebuffer and GLvisual datatypes
 *
 * Revision 1.1  1996/09/13 01:38:16  brianp
 * Initial revision
 *
 */


#ifndef TYPES_H
#define TYPES_H


#include "GL/gl.h"
#include "config.h"


struct HashTable;


/*
 * Accumulation buffer data type:
 */
#if ACCUM_BITS==8
   typedef GLbyte GLaccum;
#elif ACCUM_BITS==16
   typedef GLshort GLaccum;
#else
   illegal number of accumulation bits
#endif


/*
 * Stencil buffer data type:
 */
#if STENCIL_BITS==8
   typedef GLubyte GLstencil;
#else
   illegal number of stencil bits
#endif



/*
 * Depth buffer data type:
 */
typedef GLint GLdepth;



#include "fixed.h"



typedef struct gl_visual GLvisual;

typedef struct gl_context GLcontext;

typedef struct gl_frame_buffer GLframebuffer;



/*
 * Point, line, triangle, quadrilateral and rectangle rasterizer functions:
 */
typedef void (*points_func)( GLcontext *ctx, GLuint first, GLuint last );

typedef void (*line_func)( GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv );

typedef void (*triangle_func)( GLcontext *ctx,
                               GLuint v1, GLuint v2, GLuint v3, GLuint pv );

typedef void (*quad_func)( GLcontext *ctx, GLuint v1, GLuint v2,
                           GLuint v3, GLuint v4, GLuint pv );

typedef void (*rect_func)( GLcontext *ctx, GLint x, GLint y,
                           GLint width, GLint height );

/*
 * The auxiliary interpolation function for clipping
 */
typedef void (* interp_func)(GLcontext *, GLuint, GLuint, GLfloat, GLuint, GLuint);


/*
 * For texture sampling:
 */
struct gl_texture_object;

typedef void (*TextureSampleFunc)( const struct gl_texture_object *tObj,
                                   GLuint n,
                                   const GLfloat s[], const GLfloat t[],
                                   const GLfloat u[], const GLfloat lambda[],
                                   GLubyte r[], GLubyte g[],
                                   GLubyte b[],GLubyte a[] );


/* Generic internal image format */
struct gl_image {
    GLint Width;
    GLint Height;
    GLint Components;   /* 1, 2, 3 or 4 */
        GLenum Format;      /* GL_COLOR_INDEX, GL_RED, GL_RGB, etc */
    GLenum Type;        /* GL_UNSIGNED_BYTE or GL_FLOAT or GL_BITMAP */
    GLvoid *Data;
    GLboolean Interleaved;  /* If TRUE and Format==GL_RGB, GL_RGBA or
                                 * GL_LUMINANCE_ALPHA then each row is
                                 * stored as RRR..RGGG..GBBB.B instead of
                                 * RGBRGBRGBRGB..RGB.  This is only used
                                 * for glDrawPixels.
                                 */
    GLint RefCount;
};



/* Texture image record */
struct gl_texture_image {
    GLenum Format;      /* GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA,
                 * GL_INTENSITY, GL_RGB, GL_RGBA, or
                 * GL_COLOR_INDEX
                 */
    GLenum IntFormat;   /* Internal format as given by the user */
    GLuint Border;      /* 0 or 1 */
    GLuint Width;       /* = 2^WidthLog2 + 2*Border */
    GLuint Height;      /* = 2^HeightLog2 + 2*Border */
    GLuint Width2;      /* = Width - 2*Border */
    GLuint Height2;     /* = Height - 2*Border */
    GLuint WidthLog2;   /* = log2(Width2) */
    GLuint HeightLog2;  /* = log2(Height2) */
    GLuint MaxLog2;     /* = MAX(WidthLog2, HeightLog2) */
    GLubyte *Data;      /* Image data as unsigned bytes */

    /* For device driver: */
    void *DriverData;   /* Arbitrary device driver data */
};



/*
 * All gl* API functions in api.c jump through pointers in this struct.
 */
struct gl_api_table {
   void (*Accum)( GLcontext *, GLenum, GLfloat );
   void (*AlphaFunc)( GLcontext *, GLenum, GLclampf );
   GLboolean (*AreTexturesResident)( GLcontext *, GLsizei,
                                     const GLuint *, GLboolean * );
   void (*ArrayElement)( GLcontext *, GLint );
   void (*Begin)( GLcontext *, GLenum );
   void (*BindTexture)( GLcontext *, GLenum, GLuint );
   void (*Bitmap)( GLcontext *, GLsizei, GLsizei, GLfloat, GLfloat,
             GLfloat, GLfloat, const struct gl_image *bitmap );
   void (*BlendFunc)( GLcontext *, GLenum, GLenum );
   void (*CallList)( GLcontext *, GLuint list );
   void (*CallLists)( GLcontext *, GLsizei, GLenum, const GLvoid * );
   void (*Clear)( GLcontext *, GLbitfield );
   void (*ClearAccum)( GLcontext *, GLfloat, GLfloat, GLfloat, GLfloat );
   void (*ClearColor)( GLcontext *, GLclampf, GLclampf, GLclampf, GLclampf );
   void (*ClearDepth)( GLcontext *, GLclampd );
   void (*ClearIndex)( GLcontext *, GLfloat );
   void (*ClearStencil)( GLcontext *, GLint );
   void (*ClipPlane)( GLcontext *, GLenum, const GLfloat * );
   void (*Color3f)( GLcontext *, GLfloat, GLfloat, GLfloat );
   void (*Color3fv)( GLcontext *, const GLfloat * );
   void (*Color4f)( GLcontext *, GLfloat, GLfloat, GLfloat, GLfloat );
   void (*Color4fv)( GLcontext *, const GLfloat * );
   void (*Color4ub)( GLcontext *, GLubyte, GLubyte, GLubyte, GLubyte );
   void (*Color4ubv)( GLcontext *, const GLubyte * );
   void (*ColorMask)( GLcontext *,
            GLboolean, GLboolean, GLboolean, GLboolean );
   void (*ColorMaterial)( GLcontext *, GLenum, GLenum );
   void (*ColorPointer)( GLcontext *, GLint, GLenum, GLsizei, const GLvoid * );
   void (*ColorTable)( GLcontext *, GLenum, GLenum, struct gl_image * );
   void (*ColorSubTable)( GLcontext *, GLenum, GLsizei, struct gl_image * );
   void (*CopyPixels)( GLcontext *, GLint, GLint, GLsizei, GLsizei, GLenum );
   void (*CopyTexImage1D)( GLcontext *, GLenum, GLint, GLenum,
                           GLint, GLint, GLsizei, GLint );
   void (*CopyTexImage2D)( GLcontext *, GLenum, GLint, GLenum,
                           GLint, GLint, GLsizei, GLsizei, GLint );
   void (*CopyTexSubImage1D)( GLcontext *, GLenum, GLint, GLint,
                              GLint, GLint, GLsizei );
   void (*CopyTexSubImage2D)( GLcontext *, GLenum, GLint, GLint, GLint,
                              GLint, GLint, GLsizei, GLsizei );
   void (*CullFace)( GLcontext *, GLenum );
   void (*DeleteLists)( GLcontext *, GLuint, GLsizei );
   void (*DeleteTextures)( GLcontext *, GLsizei, const GLuint *);
   void (*DepthFunc)( GLcontext *, GLenum );
   void (*DepthMask)( GLcontext *, GLboolean );
   void (*DepthRange)( GLcontext *, GLclampd, GLclampd );
   void (*Disable)( GLcontext *, GLenum );
   void (*DisableClientState)( GLcontext *, GLenum );
   void (*DrawArrays)( GLcontext *, GLenum, GLint, GLsizei );
   void (*DrawBuffer)( GLcontext *, GLenum );
   void (*DrawElements)( GLcontext *, GLenum, GLsizei, GLenum, const GLvoid *);
   void (*DrawPixels)( GLcontext *,
                       GLsizei, GLsizei, GLenum, GLenum, const GLvoid * );
   void (*EdgeFlag)( GLcontext *, GLboolean );
   void (*EdgeFlagPointer)( GLcontext *, GLsizei, const GLboolean * );
   void (*Enable)( GLcontext *, GLenum );
   void (*EnableClientState)( GLcontext *, GLenum );
   void (*End)( GLcontext * );
   void (*EndList)( GLcontext * );
   void (*EvalCoord1f)( GLcontext *, GLfloat );
   void (*EvalCoord2f)( GLcontext *, GLfloat , GLfloat );
   void (*EvalMesh1)( GLcontext *, GLenum, GLint, GLint );
   void (*EvalMesh2)( GLcontext *, GLenum, GLint, GLint, GLint, GLint );
   void (*EvalPoint1)( GLcontext *, GLint );
   void (*EvalPoint2)( GLcontext *, GLint, GLint );
   void (*FeedbackBuffer)( GLcontext *, GLsizei, GLenum, GLfloat * );
   void (*Finish)( GLcontext * );
   void (*Flush)( GLcontext * );
   void (*Fogfv)( GLcontext *, GLenum, const GLfloat * );
   void (*FrontFace)( GLcontext *, GLenum );
   void (*Frustum)( GLcontext *, GLdouble, GLdouble, GLdouble, GLdouble,
                    GLdouble, GLdouble );
   GLuint (*GenLists)( GLcontext *, GLsizei );
   void (*GenTextures)( GLcontext *, GLsizei, GLuint * );
   void (*GetBooleanv)( GLcontext *, GLenum, GLboolean * );
   void (*GetClipPlane)( GLcontext *, GLenum, GLdouble * );
   void (*GetColorTable)( GLcontext *, GLenum, GLenum, GLenum, GLvoid *);
   void (*GetColorTableParameteriv)( GLcontext *, GLenum, GLenum, GLint *);
   void (*GetDoublev)( GLcontext *, GLenum, GLdouble * );
   GLenum (*GetError)( GLcontext * );
   void (*GetFloatv)( GLcontext *, GLenum, GLfloat * );
   void (*GetIntegerv)( GLcontext *, GLenum, GLint * );
   const GLubyte* (*GetString)( GLcontext *, GLenum name );
   void (*GetLightfv)( GLcontext *, GLenum light, GLenum, GLfloat * );
   void (*GetLightiv)( GLcontext *, GLenum light, GLenum, GLint * );
   void (*GetMapdv)( GLcontext *, GLenum, GLenum, GLdouble * );
   void (*GetMapfv)( GLcontext *, GLenum, GLenum, GLfloat * );
   void (*GetMapiv)( GLcontext *, GLenum, GLenum, GLint * );
   void (*GetMaterialfv)( GLcontext *, GLenum, GLenum, GLfloat * );
   void (*GetMaterialiv)( GLcontext *, GLenum, GLenum, GLint * );
   void (*GetPixelMapfv)( GLcontext *, GLenum, GLfloat * );
   void (*GetPixelMapuiv)( GLcontext *, GLenum, GLuint * );
   void (*GetPixelMapusv)( GLcontext *, GLenum, GLushort * );
   void (*GetPointerv)( GLcontext *, GLenum, GLvoid ** );
   void (*GetPolygonStipple)( GLcontext *, GLubyte * );
   void (*PrioritizeTextures)( GLcontext *, GLsizei, const GLuint *,
                               const GLclampf * );
   void (*GetTexEnvfv)( GLcontext *, GLenum, GLenum, GLfloat * );
   void (*GetTexEnviv)( GLcontext *, GLenum, GLenum, GLint * );
   void (*GetTexGendv)( GLcontext *, GLenum coord, GLenum, GLdouble * );
   void (*GetTexGenfv)( GLcontext *, GLenum coord, GLenum, GLfloat * );
   void (*GetTexGeniv)( GLcontext *, GLenum coord, GLenum, GLint * );
   void (*GetTexImage)( GLcontext *, GLenum, GLint level, GLenum, GLenum,
                        GLvoid * );
   void (*GetTexLevelParameterfv)( GLcontext *,
                     GLenum, GLint, GLenum, GLfloat * );
   void (*GetTexLevelParameteriv)( GLcontext *,
                     GLenum, GLint, GLenum, GLint * );
   void (*GetTexParameterfv)( GLcontext *, GLenum, GLenum, GLfloat *);
   void (*GetTexParameteriv)( GLcontext *, GLenum, GLenum, GLint * );
   void (*Hint)( GLcontext *, GLenum, GLenum );
   void (*IndexMask)( GLcontext *, GLuint );
   void (*Indexf)( GLcontext *, GLfloat c );
   void (*Indexi)( GLcontext *, GLint c );
   void (*IndexPointer)( GLcontext *, GLenum, GLsizei, const GLvoid * );
   void (*InitNames)( GLcontext * );
   void (*InterleavedArrays)( GLcontext *, GLenum, GLsizei, const GLvoid * );
   GLboolean (*IsEnabled)( GLcontext *, GLenum );
   GLboolean (*IsList)( GLcontext *, GLuint );
   GLboolean (*IsTexture)( GLcontext *, GLuint );
   void (*LightModelfv)( GLcontext *, GLenum, const GLfloat * );
   void (*Lightfv)( GLcontext *, GLenum light, GLenum, const GLfloat *, GLint);
   void (*LineStipple)( GLcontext *, GLint factor, GLushort );
   void (*LineWidth)( GLcontext *, GLfloat );
   void (*ListBase)( GLcontext *, GLuint );
   void (*LoadIdentity)( GLcontext * );
   /* LoadMatrixd implemented with glLoadMatrixf */
   void (*LoadMatrixf)( GLcontext *, const GLfloat * );
   void (*LoadName)( GLcontext *, GLuint );
   void (*LogicOp)( GLcontext *, GLenum );
   void (*Map1f)( GLcontext *, GLenum, GLfloat, GLfloat, GLint, GLint,
          const GLfloat *, GLboolean );
   void (*Map2f)( GLcontext *, GLenum, GLfloat, GLfloat, GLint, GLint,
          GLfloat, GLfloat, GLint, GLint, const GLfloat *,
          GLboolean );
   void (*MapGrid1f)( GLcontext *, GLint, GLfloat, GLfloat );
   void (*MapGrid2f)( GLcontext *, GLint, GLfloat, GLfloat,
            GLint, GLfloat, GLfloat );
   void (*Materialfv)( GLcontext *, GLenum, GLenum, const GLfloat * );
   void (*MatrixMode)( GLcontext *, GLenum );
   /* MultMatrixd implemented with glMultMatrixf */
   void (*MultMatrixf)( GLcontext *, const GLfloat * );
   void (*NewList)( GLcontext *, GLuint list, GLenum );
   void (*Normal3f)( GLcontext *, GLfloat, GLfloat, GLfloat );
   void (*Normal3fv)( GLcontext *, const GLfloat * );
   void (*NormalPointer)( GLcontext *, GLenum, GLsizei, const GLvoid * );
   void (*Ortho)( GLcontext *, GLdouble, GLdouble, GLdouble, GLdouble,
                  GLdouble, GLdouble );
   void (*PassThrough)( GLcontext *, GLfloat );
   void (*PixelMapfv)( GLcontext *, GLenum, GLint, const GLfloat * );
   void (*PixelStorei)( GLcontext *, GLenum, GLint );
   void (*PixelTransferf)( GLcontext *, GLenum, GLfloat );
   void (*PixelZoom)( GLcontext *, GLfloat, GLfloat );
   void (*PointSize)( GLcontext *, GLfloat );
   void (*PolygonMode)( GLcontext *, GLenum, GLenum );
   void (*PolygonOffset)( GLcontext *, GLfloat, GLfloat );
   void (*PolygonStipple)( GLcontext *, const GLubyte * );
   void (*PopAttrib)( GLcontext * );
   void (*PopClientAttrib)( GLcontext * );
   void (*PopMatrix)( GLcontext * );
   void (*PopName)( GLcontext * );
   void (*PushAttrib)( GLcontext *, GLbitfield );
   void (*PushClientAttrib)( GLcontext *, GLbitfield );
   void (*PushMatrix)( GLcontext * );
   void (*PushName)( GLcontext *, GLuint );
   void (*RasterPos4f)( GLcontext *,
                        GLfloat x, GLfloat y, GLfloat z, GLfloat w );
   void (*ReadBuffer)( GLcontext *, GLenum );
   void (*ReadPixels)( GLcontext *, GLint, GLint, GLsizei, GLsizei, GLenum,
             GLenum, GLvoid * );
   void (*Rectf)( GLcontext *, GLfloat, GLfloat, GLfloat, GLfloat );
   GLint (*RenderMode)( GLcontext *, GLenum );
   void (*Rotatef)( GLcontext *, GLfloat, GLfloat, GLfloat, GLfloat );
   void (*Scalef)( GLcontext *, GLfloat, GLfloat, GLfloat );
   void (*Scissor)( GLcontext *, GLint, GLint, GLsizei, GLsizei);
   void (*SelectBuffer)( GLcontext *, GLsizei, GLuint * );
   void (*ShadeModel)( GLcontext *, GLenum );
   void (*StencilFunc)( GLcontext *, GLenum, GLint, GLuint );
   void (*StencilMask)( GLcontext *, GLuint );
   void (*StencilOp)( GLcontext *, GLenum, GLenum, GLenum );
   void (*TexCoord2f)( GLcontext *, GLfloat, GLfloat );
   void (*TexCoord4f)( GLcontext *, GLfloat, GLfloat, GLfloat, GLfloat );
   void (*TexCoordPointer)( GLcontext *, GLint, GLenum, GLsizei,
                            const GLvoid *);
   void (*TexEnvfv)( GLcontext *, GLenum, GLenum, const GLfloat * );
   void (*TexGenfv)( GLcontext *, GLenum coord, GLenum, const GLfloat * );
   void (*TexImage1D)( GLcontext *, GLenum, GLint, GLint, GLsizei,
                       GLint, GLenum, GLenum, struct gl_image * );
   void (*TexImage2D)( GLcontext *, GLenum, GLint, GLint, GLsizei, GLsizei,
                       GLint, GLenum, GLenum, struct gl_image * );
   void (*TexSubImage1D)( GLcontext *, GLenum, GLint, GLint, GLsizei,
                          GLenum, GLenum, struct gl_image * );
   void (*TexSubImage2D)( GLcontext *, GLenum, GLint, GLint, GLint,
                          GLsizei, GLsizei, GLenum, GLenum,
                          struct gl_image * );
   void (*TexParameterfv)( GLcontext *, GLenum, GLenum, const GLfloat * );
   /* Translated implemented by Translatef */
   void (*Translatef)( GLcontext *, GLfloat, GLfloat, GLfloat );
   void (*Vertex2f)( GLcontext *, GLfloat, GLfloat );
   void (*Vertex3f)( GLcontext *, GLfloat, GLfloat, GLfloat );
   void (*Vertex4f)( GLcontext *, GLfloat, GLfloat, GLfloat, GLfloat );
   void (*Vertex3fv)( GLcontext *, const GLfloat * );
   void (*VertexPointer)( GLcontext *, GLint, GLenum, GLsizei, const GLvoid *);
   void (*Viewport)( GLcontext *, GLint, GLint, GLsizei, GLsizei );
};



#include "dd.h"


/*
 * Bit flags used for updating material values.
 */
#define FRONT_AMBIENT_BIT     0x1
#define BACK_AMBIENT_BIT      0x2
#define FRONT_DIFFUSE_BIT     0x4
#define BACK_DIFFUSE_BIT      0x8
#define FRONT_SPECULAR_BIT   0x10
#define BACK_SPECULAR_BIT    0x20
#define FRONT_EMISSION_BIT   0x40
#define BACK_EMISSION_BIT    0x80
#define FRONT_SHININESS_BIT 0x100
#define BACK_SHININESS_BIT  0x200
#define FRONT_INDEXES_BIT   0x400
#define BACK_INDEXES_BIT    0x800

#define FRONT_MATERIAL_BITS (FRONT_EMISSION_BIT | FRONT_AMBIENT_BIT | \
                 FRONT_DIFFUSE_BIT | FRONT_SPECULAR_BIT | \
                 FRONT_SHININESS_BIT | FRONT_INDEXES_BIT)

#define BACK_MATERIAL_BITS  (BACK_EMISSION_BIT | BACK_AMBIENT_BIT | \
                 BACK_DIFFUSE_BIT | BACK_SPECULAR_BIT | \
                 BACK_SHININESS_BIT | BACK_INDEXES_BIT)

#define ALL_MATERIAL_BITS   (FRONT_MATERIAL_BITS | BACK_MATERIAL_BITS)



/*
 * Specular exponent and material shininess lookup table sizes:
 */
#define EXP_TABLE_SIZE 512
#define SHINE_TABLE_SIZE 200

struct gl_light {
    GLfloat Ambient[4];     /* ambient color */
    GLfloat Diffuse[4];     /* diffuse color */
    GLfloat Specular[4];        /* specular color */
    GLfloat Position[4];        /* position in eye coordinates */
    GLfloat Direction[4];       /* spotlight dir in eye coordinates */
    GLfloat SpotExponent;
    GLfloat SpotCutoff;     /* in degress */
        GLfloat CosCutoff;      /* = cos(SpotCutoff) */
    GLfloat ConstantAttenuation;
    GLfloat LinearAttenuation;
    GLfloat QuadraticAttenuation;
    GLboolean Enabled;      /* On/off flag */

    struct gl_light *NextEnabled;   /* Ptr to next enabled light or NULL */

    /* Derived fields */
    GLfloat VP_inf_norm[3];     /* Norm direction to infinite light */
    GLfloat h_inf_norm[3];      /* Norm( VP_inf_norm + <0,0,1> ) */
        GLfloat NormDirection[3];   /* normalized spotlight direction */
        GLfloat SpotExpTable[EXP_TABLE_SIZE][2];  /* to replace a pow() call */
    GLfloat MatAmbient[2][3];   /* material ambient * light ambient */
    GLfloat MatDiffuse[2][3];   /* material diffuse * light diffuse */
    GLfloat MatSpecular[2][3];  /* material spec * light specular */
    GLfloat dli;            /* CI diffuse light intensity */
    GLfloat sli;            /* CI specular light intensity */
};


struct gl_lightmodel {
    GLfloat Ambient[4];     /* ambient color */
    GLboolean LocalViewer;      /* Local (or infinite) view point? */
    GLboolean TwoSide;      /* Two (or one) sided lighting? */
};


struct gl_material {
    GLfloat Ambient[4];
    GLfloat Diffuse[4];
    GLfloat Specular[4];
    GLfloat Emission[4];
    GLfloat Shininess;
    GLfloat AmbientIndex;   /* for color index lighting */
    GLfloat DiffuseIndex;   /* for color index lighting */
    GLfloat SpecularIndex;  /* for color index lighting */
        GLfloat ShineTable[SHINE_TABLE_SIZE];  /* to replace a pow() call */
};



/*
 * Attribute structures:
 *    We define a struct for each attribute group to make pushing and
 *    popping attributes easy.  Also it's a good organization.
 */


struct gl_accum_attrib {
    GLfloat ClearColor[4];  /* Accumulation buffer clear color */
};


struct gl_colorbuffer_attrib {
    GLuint ClearIndex;      /* Index to use for glClear */
    GLfloat ClearColor[4];      /* Color to use for glClear */

    GLuint IndexMask;       /* Color index write mask */
    GLuint ColorMask;       /* bit 3=red,2=green,1=blue,0=alpha*/
        GLboolean SWmasking;        /* Do color/CI masking in software? */

    GLenum DrawBuffer;      /* Which buffer to draw into */

    /* alpha testing */
    GLboolean AlphaEnabled;     /* Alpha test enabled flag */
    GLenum AlphaFunc;       /* Alpha test function */
    GLfloat AlphaRef;       /* Alpha reference value */
    GLubyte AlphaRefUbyte;      /* AlphaRef scaled to an integer */

    /* blending */
    GLboolean BlendEnabled;     /* Blending enabled flag */
    GLenum BlendSrc;        /* Blending source operator */
    GLenum BlendDst;        /* Blending destination operator */

    /* logic op */
    GLenum LogicOp;         /* Logic operator */
    GLboolean IndexLogicOpEnabled;  /* Color index logic op enabled flag */
    GLboolean ColorLogicOpEnabled;  /* RGBA logic op enabled flag */
    GLboolean SWLogicOpEnabled; /* Do logic ops in software? */

    GLboolean DitherFlag;       /* Dither enable flag */
};


struct gl_current_attrib {
    GLubyte ByteColor[4];       /* Current RGBA color */
    GLuint Index;           /* Current color index */
    GLfloat Normal[3];      /* Current normal vector */
    GLfloat TexCoord[4];        /* Current texture coordinate */
    GLfloat RasterPos[4];       /* Current raster position */
    GLfloat RasterDistance;     /* Current raster distance */
    GLfloat RasterColor[4];     /* Current raster color */
    GLuint RasterIndex;     /* Current raster index */
    GLfloat RasterTexCoord[4];  /* Current raster texture coord */
    GLboolean RasterPosValid;   /* Raster position valid flag */
    GLboolean EdgeFlag;     /* Current edge flag */
};


struct gl_depthbuffer_attrib {
    GLenum Func;        /* Function for depth buffer compare */
    GLfloat Clear;      /* Value to clear depth buffer to */
    GLboolean Test;     /* Depth buffering enabled flag */
    GLboolean Mask;     /* Depth buffer writable? */
};


struct gl_enable_attrib {
    GLboolean AlphaTest;
    GLboolean AutoNormal;
    GLboolean Blend;
    GLboolean ClipPlane[MAX_CLIP_PLANES];
    GLboolean ColorMaterial;
    GLboolean CullFace;
    GLboolean DepthTest;
    GLboolean Dither;
    GLboolean Fog;
    GLboolean Light[MAX_LIGHTS];
    GLboolean Lighting;
    GLboolean LineSmooth;
    GLboolean LineStipple;
    GLboolean IndexLogicOp;
    GLboolean ColorLogicOp;
    GLboolean Map1Color4;
    GLboolean Map1Index;
    GLboolean Map1Normal;
    GLboolean Map1TextureCoord1;
    GLboolean Map1TextureCoord2;
    GLboolean Map1TextureCoord3;
    GLboolean Map1TextureCoord4;
    GLboolean Map1Vertex3;
    GLboolean Map1Vertex4;
    GLboolean Map2Color4;
    GLboolean Map2Index;
    GLboolean Map2Normal;
    GLboolean Map2TextureCoord1;
    GLboolean Map2TextureCoord2;
    GLboolean Map2TextureCoord3;
    GLboolean Map2TextureCoord4;
    GLboolean Map2Vertex3;
    GLboolean Map2Vertex4;
    GLboolean Normalize;
    GLboolean PointSmooth;
    GLboolean PolygonOffsetPoint;
    GLboolean PolygonOffsetLine;
    GLboolean PolygonOffsetFill;
    GLboolean PolygonSmooth;
    GLboolean PolygonStipple;
    GLboolean Scissor;
    GLboolean Stencil;
    GLuint Texture;
    GLuint TexGen;
};


struct gl_eval_attrib {
    /* Enable bits */
    GLboolean Map1Color4;
    GLboolean Map1Index;
    GLboolean Map1Normal;
    GLboolean Map1TextureCoord1;
    GLboolean Map1TextureCoord2;
    GLboolean Map1TextureCoord3;
    GLboolean Map1TextureCoord4;
    GLboolean Map1Vertex3;
    GLboolean Map1Vertex4;
    GLboolean Map2Color4;
    GLboolean Map2Index;
    GLboolean Map2Normal;
    GLboolean Map2TextureCoord1;
    GLboolean Map2TextureCoord2;
    GLboolean Map2TextureCoord3;
    GLboolean Map2TextureCoord4;
    GLboolean Map2Vertex3;
    GLboolean Map2Vertex4;
    GLboolean AutoNormal;
    /* Map Grid endpoints and divisions */
    GLuint MapGrid1un;
    GLfloat MapGrid1u1, MapGrid1u2;
    GLuint MapGrid2un, MapGrid2vn;
    GLfloat MapGrid2u1, MapGrid2u2;
    GLfloat MapGrid2v1, MapGrid2v2;
};


struct gl_fog_attrib {
    GLboolean Enabled;      /* Fog enabled flag */
    GLfloat Color[4];       /* Fog color */
    GLfloat Density;        /* Density >= 0.0 */
    GLfloat Start;          /* Start distance in eye coords */
    GLfloat End;            /* End distance in eye coords */
    GLfloat Index;          /* Fog index */
    GLenum Mode;            /* Fog mode */
};


struct gl_hint_attrib {
    /* always one of GL_FASTEST, GL_NICEST, or GL_DONT_CARE */
    GLenum PerspectiveCorrection;
    GLenum PointSmooth;
    GLenum LineSmooth;
    GLenum PolygonSmooth;
    GLenum Fog;
};


struct gl_light_attrib {
   struct gl_light Light[MAX_LIGHTS];   /* Array of lights */
   struct gl_lightmodel Model;      /* Lighting model */
   struct gl_material Material[2];  /* Material 0=front, 1=back */
   GLboolean Enabled;           /* Lighting enabled flag */
   GLenum ShadeModel;           /* GL_FLAT or GL_SMOOTH */
   GLenum ColorMaterialFace;        /* GL_FRONT, BACK or FRONT_AND_BACK */
   GLenum ColorMaterialMode;        /* GL_AMBIENT, GL_DIFFUSE, etc */
   GLuint ColorMaterialBitmask;     /* bitmask formed from Face and Mode */
   GLboolean ColorMaterialEnabled;

   /* Derived for optimizations: */
   struct gl_light *FirstEnabled;   /* Ptr to 1st enabled light */
   GLboolean Fast;          /* Use fast shader? */
   GLfloat BaseColor[2][4];
};


struct gl_line_attrib {
    GLboolean SmoothFlag;       /* GL_LINE_SMOOTH enabled? */
    GLboolean StippleFlag;      /* GL_LINE_STIPPLE enabled? */
    GLushort StipplePattern;    /* Stipple pattern */
    GLint StippleFactor;        /* Stipple repeat factor */
    GLfloat Width;          /* Line width */
};


struct gl_list_attrib {
    GLuint ListBase;
};


struct gl_pixel_attrib {
    GLenum ReadBuffer;
    GLfloat RedBias, RedScale;  /* Pixel xfer bias & scale values */
    GLfloat GreenBias, GreenScale;
    GLfloat BlueBias, BlueScale;
    GLfloat AlphaBias, AlphaScale;
    GLfloat DepthBias, DepthScale;
    GLint IndexShift;
    GLint IndexOffset;
    GLboolean MapColorFlag;
    GLboolean MapStencilFlag;
    GLfloat ZoomX;          /* Pixel zoom X factor */
    GLfloat ZoomY;          /* Pixel zoom Y factor */
    /* TODO: Do the following belong here??? */
    GLint MapStoSsize;          /* Size of each pixel map */
    GLint MapItoIsize;
    GLint MapItoRsize;
    GLint MapItoGsize;
    GLint MapItoBsize;
    GLint MapItoAsize;
    GLint MapRtoRsize;
    GLint MapGtoGsize;
    GLint MapBtoBsize;
    GLint MapAtoAsize;
    GLint MapStoS[MAX_PIXEL_MAP_TABLE]; /* Pixel map tables */
    GLint MapItoI[MAX_PIXEL_MAP_TABLE];
    GLfloat MapItoR[MAX_PIXEL_MAP_TABLE];
    GLfloat MapItoG[MAX_PIXEL_MAP_TABLE];
    GLfloat MapItoB[MAX_PIXEL_MAP_TABLE];
    GLfloat MapItoA[MAX_PIXEL_MAP_TABLE];
    GLfloat MapRtoR[MAX_PIXEL_MAP_TABLE];
    GLfloat MapGtoG[MAX_PIXEL_MAP_TABLE];
    GLfloat MapBtoB[MAX_PIXEL_MAP_TABLE];
    GLfloat MapAtoA[MAX_PIXEL_MAP_TABLE];
};


struct gl_point_attrib {
    GLboolean SmoothFlag;   /* True if GL_POINT_SMOOTH is enabled */
    GLfloat Size;       /* Point size */
};


struct gl_polygon_attrib {
    GLenum FrontFace;   /* Either GL_CW or GL_CCW */
    GLenum FrontMode;   /* Either GL_POINT, GL_LINE or GL_FILL */
    GLenum BackMode;    /* Either GL_POINT, GL_LINE or GL_FILL */
    GLboolean Unfilled; /* True if back or front mode is not GL_FILL */
    GLboolean CullFlag; /* Culling on/off flag */
    GLenum CullFaceMode;    /* Culling mode GL_FRONT or GL_BACK */
        GLuint CullBits;    /* Used for cull testing */
    GLboolean SmoothFlag;   /* True if GL_POLYGON_SMOOTH is enabled */
    GLboolean StippleFlag;  /* True if GL_POLYGON_STIPPLE is enabled */
        GLfloat OffsetFactor;   /* Polygon offset factor */
        GLfloat OffsetUnits;    /* Polygon offset units */
        GLboolean OffsetPoint;  /* Offset in GL_POINT mode? */
        GLboolean OffsetLine;   /* Offset in GL_LINE mode? */
        GLboolean OffsetFill;   /* Offset in GL_FILL mode? */
        GLboolean OffsetAny;    /* OR of OffsetPoint, OffsetLine, OffsetFill */
};


struct gl_scissor_attrib {
    GLboolean   Enabled;        /* Scissor test enabled? */
    GLint       X, Y;           /* Lower left corner of box */
    GLsizei     Width, Height;      /* Size of box */
};


struct gl_stencil_attrib {
    GLboolean   Enabled;    /* Enabled flag */
    GLenum      Function;   /* Stencil function */
    GLenum      FailFunc;   /* Fail function */
    GLenum      ZPassFunc;  /* Depth buffer pass function */
    GLenum      ZFailFunc;  /* Depth buffer fail function */
    GLstencil   Ref;        /* Reference value */
    GLstencil   ValueMask;  /* Value mask */
    GLstencil   Clear;      /* Clear value */
    GLstencil   WriteMask;  /* Write mask */
};


#define Q_BIT 1
#define R_BIT 2
#define S_BIT 4
#define T_BIT 8

#define TEXTURE_1D 1
#define TEXTURE_2D 2


struct gl_texture_attrib {
    GLuint Enabled;         /* Bitwise-OR of TEXTURE_XD values */
    GLenum EnvMode;         /* GL_MODULATE, GL_DECAL, GL_BLEND */
    GLfloat EnvColor[4];
    GLuint TexGenEnabled;       /* Bitwise-OR of [QRST]_BIT values */
    GLenum GenModeS;        /* Tex coord generation mode, either */
    GLenum GenModeT;        /*  GL_OBJECT_LINEAR, or */
    GLenum GenModeR;        /*  GL_EYE_LINEAR, or    */
    GLenum GenModeQ;        /*      GL_SPHERE_MAP        */
    GLfloat ObjectPlaneS[4];
    GLfloat ObjectPlaneT[4];
    GLfloat ObjectPlaneR[4];
    GLfloat ObjectPlaneQ[4];
    GLfloat EyePlaneS[4];
    GLfloat EyePlaneT[4];
    GLfloat EyePlaneR[4];
    GLfloat EyePlaneQ[4];
    struct gl_texture_object *Current1D;
    struct gl_texture_object *Current2D;
    struct gl_texture_object *Current;  /* = Current1D, 2D or NULL */
#ifdef GL_VERSION_1_1
    struct gl_texture_object *Proxy1D;
    struct gl_texture_object *Proxy2D;
#endif
    GLboolean AnyDirty;
};


struct gl_transform_attrib {
    GLenum MatrixMode;          /* Matrix mode */
    GLfloat ClipEquation[MAX_CLIP_PLANES][4];
    GLboolean ClipEnabled[MAX_CLIP_PLANES];
    GLboolean AnyClip;          /* Any ClipEnabled[] true? */
    GLboolean Normalize;            /* Normalize all normals? */
};


struct gl_viewport_attrib {
    GLint X, Y;     /* position */
    GLsizei Width, Height;  /* size */
    GLfloat Near, Far;  /* Depth buffer range */
    GLfloat Sx, Sy, Sz; /* NDC to WinCoord scaling */
    GLfloat Tx, Ty, Tz; /* NDC to WinCoord translation */
};


/* For the attribute stack: */
struct gl_attrib_node {
    GLbitfield kind;
    void *data;
    struct gl_attrib_node *next;
};



/*
 * Client pixel packing/unpacking attributes
 */
struct gl_pixelstore_attrib {
    GLint Alignment;
    GLint RowLength;
    GLint SkipPixels;
    GLint SkipRows;
    GLboolean SwapBytes;
    GLboolean LsbFirst;
};


/*
 * Client vertex array attributes
 */
struct gl_array_attrib {
    GLint VertexSize;
    GLenum VertexType;
    GLsizei VertexStride;       /* user-specified stride */
    GLsizei VertexStrideB;      /* actual stride in bytes */
    void *VertexPtr;
    GLboolean VertexEnabled;

    GLenum NormalType;
    GLsizei NormalStride;       /* user-specified stride */
    GLsizei NormalStrideB;      /* actual stride in bytes */
    void *NormalPtr;
    GLboolean NormalEnabled;

    GLint ColorSize;
    GLenum ColorType;
    GLsizei ColorStride;        /* user-specified stride */
    GLsizei ColorStrideB;       /* actual stride in bytes */
    void *ColorPtr;
    GLboolean ColorEnabled;

    GLenum IndexType;
    GLsizei IndexStride;        /* user-specified stride */
    GLsizei IndexStrideB;       /* actual stride in bytes */
    void *IndexPtr;
    GLboolean IndexEnabled;

    GLint TexCoordSize;
    GLenum TexCoordType;
    GLsizei TexCoordStride;     /* user-specified stride */
    GLsizei TexCoordStrideB;    /* actual stride in bytes */
    void *TexCoordPtr;
    GLboolean TexCoordEnabled;

    GLsizei EdgeFlagStride;     /* user-specified stride */
    GLsizei EdgeFlagStrideB;    /* actual stride in bytes */
    GLboolean *EdgeFlagPtr;
    GLboolean EdgeFlagEnabled;
};



struct gl_feedback {
    GLenum Type;
    GLuint Mask;
    GLfloat *Buffer;
    GLuint BufferSize;
    GLuint Count;
};



struct gl_selection {
    GLuint *Buffer;
    GLuint BufferSize;  /* size of SelectBuffer */
    GLuint BufferCount; /* number of values in SelectBuffer */
    GLuint Hits;        /* number of records in SelectBuffer */
    GLuint NameStackDepth;
    GLuint NameStack[MAX_NAME_STACK_DEPTH];
    GLboolean HitFlag;
    GLfloat HitMinZ, HitMaxZ;
};



/*
 * 1-D Evaluator control points
 */
struct gl_1d_map {
    GLuint Order;       /* Number of control points */
    GLfloat u1, u2;
    GLfloat *Points;    /* Points to contiguous control points */
    GLboolean Retain;   /* Reference counter */
};
    

/*
 * 2-D Evaluator control points
 */
struct gl_2d_map {
    GLuint Uorder;      /* Number of control points in U dimension */
    GLuint Vorder;      /* Number of control points in V dimension */
    GLfloat u1, u2;
    GLfloat v1, v2;
    GLfloat *Points;    /* Points to contiguous control points */
    GLboolean Retain;   /* Reference counter */
};


/*
 * All evalutator control points
 */
struct gl_evaluators {
    /* 1-D maps */
    struct gl_1d_map Map1Vertex3;
    struct gl_1d_map Map1Vertex4;
    struct gl_1d_map Map1Index;
    struct gl_1d_map Map1Color4;
    struct gl_1d_map Map1Normal;
    struct gl_1d_map Map1Texture1;
    struct gl_1d_map Map1Texture2;
    struct gl_1d_map Map1Texture3;
    struct gl_1d_map Map1Texture4;

    /* 2-D maps */
    struct gl_2d_map Map2Vertex3;
    struct gl_2d_map Map2Vertex4;
    struct gl_2d_map Map2Index;
    struct gl_2d_map Map2Color4;
    struct gl_2d_map Map2Normal;
    struct gl_2d_map Map2Texture1;
    struct gl_2d_map Map2Texture2;
    struct gl_2d_map Map2Texture3;
    struct gl_2d_map Map2Texture4;
};



/* Texture object record */
struct gl_texture_object {
    GLint RefCount;         /* reference count */
    GLuint Name;            /* an unsigned integer */
    GLuint Dimensions;      /* 1 or 2 or 3 */
    GLfloat Priority;       /* in [0,1] */
    GLint BorderColor[4];       /* as integers in [0,255] */
    GLenum WrapS;           /* GL_CLAMP or GL_REPEAT */
    GLenum WrapT;           /* GL_CLAMP or GL_REPEAT */
    GLenum WrapR;           /* GL_CLAMP or GL_REPEAT */
    GLenum MinFilter;       /* minification filter */
    GLenum MagFilter;       /* magnification filter */
    GLfloat MinMagThresh;       /* min/mag threshold */
    struct gl_texture_image *Image[MAX_TEXTURE_LEVELS];

    /* GL_EXT_paletted_texture */
    GLubyte Palette[MAX_TEXTURE_PALETTE_SIZE*4];
    GLuint PaletteSize;
    GLenum PaletteIntFormat;
    GLenum PaletteFormat;

    /* For device driver: */
    GLboolean Dirty;    /* Set when any texobj state changes */
    void *DriverData;   /* Arbitrary device driver data */

    GLboolean Complete;     /* Complete set of images? */
    TextureSampleFunc SampleFunc;
    struct gl_texture_object *Next; /* Next in linked list */
};



/*
 * State which can be shared by multiple contexts:
 */
struct gl_shared_state {
   GLint RefCount;          /* Reference count */
   struct HashTable *DisplayList;   /* Display lists hash table */
   struct HashTable *TexObjects;    /* Texture objects hash table */
   struct gl_texture_object *TexObjectList;/* Linked list of texture objects */
   struct gl_texture_object *Default1D; /* Default texture objects */
   struct gl_texture_object *Default2D;
};



/*
 * Describes the color, depth, stencil and accum buffer parameters.
 */
struct gl_visual {
    GLboolean RGBAflag; /* Is frame buffer in RGBA mode, not CI? */
    GLboolean DBflag;   /* Is color buffer double buffered? */

    GLfloat RedScale;   /* These values are used to scale color */
    GLfloat GreenScale; /* components from the range [0,1] to */
    GLfloat BlueScale;  /* integer values.  It should be the case */
    GLfloat AlphaScale; /* that scale = 2^bits - 1 where bits is */
                /* the number of bits for the component */
                /* in the frame buffer. */
    GLboolean EightBitColor;/* TRUE if all the above scales are 255.0 */

        GLfloat InvRedScale;    /* = 1 / RedScale */
        GLfloat InvGreenScale;  /* = 1 / GreenScale */
        GLfloat InvBlueScale;   /* = 1 / BlueScale */
        GLfloat InvAlphaScale;  /* = 1 / AlphaScale */

    GLint RedBits;      /* Bits per color component */
    GLint GreenBits;
    GLint BlueBits;
    GLint AlphaBits;

    GLint IndexBits;    /* Bits/pixel if in color index mode */

    GLint AccumBits;    /* Number of bits per color channel, or 0 */
    GLint DepthBits;    /* Number of bits in depth buffer, or 0 */
    GLint StencilBits;  /* Number of bits in stencil buffer, or 0 */

    /* Software alpha planes: */
    GLboolean FrontAlphaEnabled;
    GLboolean BackAlphaEnabled;
};



/*
 * A "frame buffer" is a color buffer and its optional ancillary buffers:
 * depth, accum, stencil, and software-simulated alpha buffers.
 */
struct gl_frame_buffer {
    GLvisual *Visual;   /* The corresponding visual */

    GLint Width;        /* Width of frame buffer in pixels */
    GLint Height;       /* Height of frame buffer in pixels */

    GLdepth *Depth;     /* array [Width*Height] of GLdepth values */

    /* Stencil buffer */
    GLstencil *Stencil; /* array [Width*Height] of GLstencil values */

    /* Accumulation buffer */
    GLaccum *Accum;     /* array [4*Width*Height] of GLaccum values */

    /* Software alpha planes: */
    GLubyte *FrontAlpha;    /* array [Width*Height] of GLubyte */
    GLubyte *BackAlpha; /* array [Width*Height] of GLubyte */
    GLubyte *Alpha;     /* Points to front or back alpha buffer */

    /* Drawing bounds: intersection of window size and scissor box */
    GLint Xmin, Xmax, Ymin, Ymax;
};



/*
 * Bitmasks to indicate what auxillary information must be interpolated
 * when clipping (ClipMask).
 */
#define CLIP_FCOLOR_BIT     0x01
#define CLIP_BCOLOR_BIT     0x02
#define CLIP_FINDEX_BIT     0x04
#define CLIP_BINDEX_BIT     0x08
#define CLIP_TEXTURE_BIT    0x10



/*
 * Bitmasks to indicate which rasterization options are enabled (RasterMask)
 */
#define ALPHATEST_BIT       0x001   /* Alpha-test pixels */
#define BLEND_BIT       0x002   /* Blend pixels */
#define DEPTH_BIT       0x004   /* Depth-test pixels */
#define FOG_BIT         0x008   /* Per-pixel fog */
#define LOGIC_OP_BIT        0x010   /* Apply logic op in software */
#define SCISSOR_BIT     0x020   /* Scissor pixels */
#define STENCIL_BIT     0x040   /* Stencil pixels */
#define MASKING_BIT     0x080   /* Do glColorMask() or glIndexMask() */
#define ALPHABUF_BIT        0x100   /* Using software alpha buffer */
#define WINCLIP_BIT     0x200   /* Clip pixels/primitives to window */
#define FRONT_AND_BACK_BIT  0x400   /* Write to front and back buffers */
#define NO_DRAW_BIT     0x800   /* Don't write any pixels */


/*
 * Bits to indicate what state has to be updated (NewState)
 */
#define NEW_LIGHTING    0x1
#define NEW_RASTER_OPS  0x2
#define NEW_TEXTURING   0x4
#define NEW_POLYGON 0x8
#define NEW_ALL     0xf


/*
 * Different kinds of 4x4 transformation matrices:
 */
#define MATRIX_GENERAL      0   /* general 4x4 matrix */
#define MATRIX_IDENTITY     1   /* identity matrix */
#define MATRIX_ORTHO        2   /* orthographic projection matrix */
#define MATRIX_PERSPECTIVE  3   /* perspective projection matrix */
#define MATRIX_2D       4   /* 2-D transformation */
#define MATRIX_2D_NO_ROT    5   /* 2-D scale & translate only */
#define MATRIX_3D       6   /* 3-D transformation */


/*
 * Forward declaration of display list datatypes:
 */
union node;
typedef union node Node;



/*
 * The library context: 
 */

struct gl_context {
    /* State possibly shared with other contexts in the address space */
    struct gl_shared_state *Shared;

    /* API function pointer tables */
    struct gl_api_table API;        /* For api.c */
    struct gl_api_table Save;       /* Display list save funcs */
    struct gl_api_table Exec;       /* Execute funcs */

        GLvisual *Visual;
        GLframebuffer *Buffer;

    /* Driver function pointer table */
    struct dd_function_table Driver;

    void *DriverCtx;    /* Points to device driver context/state */
    void *DriverMgrCtx; /* Points to device driver manager (optional)*/

    /* Modelview matrix and stack */
    GLboolean NewModelViewMatrix;
    GLuint ModelViewMatrixType; /* = one of MATRIX_* values */
    GLfloat ModelViewMatrix[16];
    GLfloat ModelViewInv[16];   /* Inverse of ModelViewMatrix */
    GLuint ModelViewStackDepth;
    GLfloat ModelViewStack[MAX_MODELVIEW_STACK_DEPTH][16];

    /* Projection matrix and stack */
    GLboolean NewProjectionMatrix;
    GLuint ProjectionMatrixType;    /* = one of MATRIX_* values */
    GLfloat ProjectionMatrix[16];
    GLuint ProjectionStackDepth;
    GLfloat ProjectionStack[MAX_PROJECTION_STACK_DEPTH][16];
    GLfloat NearFarStack[MAX_PROJECTION_STACK_DEPTH][2];

    /* Texture matrix and stack */
    GLboolean NewTextureMatrix;
    GLuint TextureMatrixType;   /* = one of MATRIX_* values */
    GLfloat TextureMatrix[16];
    GLuint TextureStackDepth;
    GLfloat TextureStack[MAX_TEXTURE_STACK_DEPTH][16];

    /* Display lists */
    GLuint CallDepth;   /* Current recursion calling depth */
    GLboolean ExecuteFlag;  /* Execute GL commands? */
    GLboolean CompileFlag;  /* Compile GL commands into display list? */
    Node *CurrentListPtr;   /* Head of list being compiled */
    GLuint CurrentListNum;  /* Number of the list being compiled */
    Node *CurrentBlock; /* Pointer to current block of nodes */
    GLuint CurrentPos;  /* Index into current block of nodes */

    /* Renderer attribute stack */
    GLuint AttribStackDepth;
    struct gl_attrib_node *AttribStack[MAX_ATTRIB_STACK_DEPTH];

    /* Renderer attribute groups */
    struct gl_accum_attrib      Accum;
    struct gl_colorbuffer_attrib    Color;
    struct gl_current_attrib    Current;
    struct gl_depthbuffer_attrib    Depth;
    struct gl_eval_attrib       Eval;
    struct gl_fog_attrib        Fog;
    struct gl_hint_attrib       Hint;
    struct gl_light_attrib      Light;
    struct gl_line_attrib       Line;
    struct gl_list_attrib       List;
    struct gl_pixel_attrib      Pixel;
    struct gl_point_attrib      Point;
    struct gl_polygon_attrib    Polygon;
    GLuint PolygonStipple[32];
    struct gl_scissor_attrib    Scissor;
    struct gl_stencil_attrib    Stencil;
    struct gl_texture_attrib    Texture;
    struct gl_transform_attrib  Transform;
    struct gl_viewport_attrib   Viewport;

    /* Client attribute stack */
    GLuint ClientAttribStackDepth;
    struct gl_attrib_node *ClientAttribStack[MAX_CLIENT_ATTRIB_STACK_DEPTH];
    /* Client attribute groups */
    struct gl_array_attrib      Array;  /* Vertex arrays */
    struct gl_pixelstore_attrib Pack;   /* Pixel packing */
    struct gl_pixelstore_attrib Unpack; /* Pixel unpacking */

    struct gl_evaluators EvalMap;   /* All evaluators */
    struct gl_feedback Feedback;    /* Feedback */
    struct gl_selection Select; /* Selection */

    GLenum ErrorValue;      /* Last error code */

    GLboolean DirectContext;    /* Important for real GLX */

    /* Miscellaneous */
        GLuint NewState;        /* bitwise OR of NEW_* flags */
    GLenum RenderMode;  /* either GL_RENDER, GL_SELECT, GL_FEEDBACK */
    GLenum Primitive;   /* glBegin primitive or GL_BITMAP */
    GLuint StippleCounter;  /* Line stipple counter */
    GLuint ClipMask;    /* OR of CLIP_* values from above */
        interp_func ClipInterpAuxFunc; /* The auxiliary interpolation function */
    GLuint RasterMask;  /* OR of rasterization flags */
    GLboolean LightTwoSide; /* Compute two-sided lighting? */
    GLboolean DirectTriangles;/* Directly call (*ctx->TriangleFunc) ? */
    GLfloat PolygonZoffset; /* Z offset for GL_FILL polygons */
    GLfloat LineZoffset;    /* Z offset for GL_LINE polygons */
    GLfloat PointZoffset;   /* Z offset for GL_POINT polygons */
    GLboolean NeedNormals;   /* Are vertex normal vectors needed? */
        GLboolean FastDrawPixels;/* Use optimized glDrawPixels? */
        GLboolean MutablePixels; /* Can rasterization change pixel's color? */
        GLboolean MonoPixels;    /* Are all pixels likely to be same color? */

    /* Current Primitive functions */
        points_func PointsFunc;
        line_func LineFunc;
        triangle_func TriangleFunc;
        quad_func QuadFunc;
        rect_func RectFunc;

        /* The vertex buffer being used by this context */
        struct vertex_buffer* VB;

        /* The pixel buffer being used by this context */
        struct pixel_buffer* PB;

#ifdef PROFILE
        /* Performance measurements */
        GLuint BeginEndCount;   /* number of glBegin/glEnd pairs */
        GLdouble BeginEndTime;  /* seconds spent between glBegin/glEnd */
        GLuint VertexCount; /* number of vertices processed */
        GLdouble VertexTime;    /* total time in seconds */
        GLuint PointCount;  /* number of points rendered */
        GLdouble PointTime; /* total time in seconds */
        GLuint LineCount;   /* number of lines rendered */
        GLdouble LineTime;  /* total time in seconds */
        GLuint PolygonCount;    /* number of polygons rendered */
        GLdouble PolygonTime;   /* total time in seconds */
        GLuint ClearCount;  /* number of glClear calls */
        GLdouble ClearTime; /* seconds spent in glClear */
        GLuint SwapCount;   /* number of swap-buffer calls */
        GLdouble SwapTime;  /* seconds spent in swap-buffers */
#endif

        /* For debugging/development only */
        GLboolean NoRaster;

        /* Dither disable via MESA_NO_DITHER env var */
        GLboolean NoDither;
};


#endif