[mesa.git] / src / mesa / main / mtypes.h

/**
 * \file mtypes.h
 * Main Mesa data structures.
 *
 * Please try to mark derived values with a leading underscore ('_').
 */

/*
 * Mesa 3-D graphics library
 * Version:  6.5
 *
 * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */



#ifndef TYPES_H
#define TYPES_H


#include "glheader.h"
#include <GL/internal/glcore.h> /* GLimports/GLexports/GLcontextModes */
#include "config.h"             /* Hardwired parameters */
#include "glapitable.h"
#include "glthread.h"
#include "math/m_matrix.h"      /* GLmatrix */
#include "bitset.h"


/**
 * Color channel data type.
 */
#if CHAN_BITS == 8
   typedef GLubyte GLchan;
#define CHAN_MAX 255
#define CHAN_MAXF 255.0F
#define CHAN_TYPE GL_UNSIGNED_BYTE
#elif CHAN_BITS == 16
   typedef GLushort GLchan;
#define CHAN_MAX 65535
#define CHAN_MAXF 65535.0F
#define CHAN_TYPE GL_UNSIGNED_SHORT
#elif CHAN_BITS == 32
   typedef GLfloat GLchan;
#define CHAN_MAX 1.0
#define CHAN_MAXF 1.0F
#define CHAN_TYPE GL_FLOAT
#else
#error "illegal number of color channel bits"
#endif


/**
 * Stencil buffer data type.
 */
#if STENCIL_BITS==8
   typedef GLubyte GLstencil;
#elif STENCIL_BITS==16
   typedef GLushort GLstencil;
#else
#  error "illegal number of stencil bits"
#endif


/**
 * Fixed point data type.
 */
typedef int GLfixed;
/*
 * Fixed point arithmetic macros
 */
#ifndef FIXED_FRAC_BITS
#define FIXED_FRAC_BITS 11
#endif

#define FIXED_SHIFT     FIXED_FRAC_BITS
#define FIXED_ONE       (1 << FIXED_SHIFT)
#define FIXED_HALF      (1 << (FIXED_SHIFT-1))
#define FIXED_FRAC_MASK (FIXED_ONE - 1)
#define FIXED_INT_MASK  (~FIXED_FRAC_MASK)
#define FIXED_EPSILON   1
#define FIXED_SCALE     ((float) FIXED_ONE)
#define FIXED_DBL_SCALE ((double) FIXED_ONE)
#define FloatToFixed(X) (IROUND((X) * FIXED_SCALE))
#define FixedToDouble(X) ((X) * (1.0 / FIXED_DBL_SCALE))
#define IntToFixed(I)   ((I) << FIXED_SHIFT)
#define FixedToInt(X)   ((X) >> FIXED_SHIFT)
#define FixedToUns(X)   (((unsigned int)(X)) >> FIXED_SHIFT)
#define FixedCeil(X)    (((X) + FIXED_ONE - FIXED_EPSILON) & FIXED_INT_MASK)
#define FixedFloor(X)   ((X) & FIXED_INT_MASK)
#define FixedToFloat(X) ((X) * (1.0F / FIXED_SCALE))
#define PosFloatToFixed(X)      FloatToFixed(X)
#define SignedFloatToFixed(X)   FloatToFixed(X)



/**
 * \name Some forward type declarations
 */
/*@{*/
struct _mesa_HashTable;
struct gl_pixelstore_attrib;
struct gl_texture_format;
struct gl_texture_image;
struct gl_texture_object;
typedef struct __GLcontextRec GLcontext;
typedef struct __GLcontextModesRec GLvisual;
typedef struct gl_framebuffer GLframebuffer;
/*@}*/



/**
 * Indexes for vertex program attributes.
 * GL_NV_vertex_program aliases generic attributes over the conventional
 * attributes.  In GL_ARB_vertex_program shader the aliasing is optional.
 * In GL_ARB_vertex_shader / OpenGL 2.0 the aliasing is disallowed (the
 * generic attributes are distinct/separate).
 */
enum
{
   VERT_ATTRIB_POS = 0,
   VERT_ATTRIB_WEIGHT = 1,
   VERT_ATTRIB_NORMAL = 2,
   VERT_ATTRIB_COLOR0 = 3,
   VERT_ATTRIB_COLOR1 = 4,
   VERT_ATTRIB_FOG = 5,
   VERT_ATTRIB_COLOR_INDEX = 6,
   VERT_ATTRIB_SEVEN = 7,
   VERT_ATTRIB_TEX0 = 8,
   VERT_ATTRIB_TEX1 = 9,
   VERT_ATTRIB_TEX2 = 10,
   VERT_ATTRIB_TEX3 = 11,
   VERT_ATTRIB_TEX4 = 12,
   VERT_ATTRIB_TEX5 = 13,
   VERT_ATTRIB_TEX6 = 14,
   VERT_ATTRIB_TEX7 = 15,
   VERT_ATTRIB_GENERIC0 = 16,
   VERT_ATTRIB_GENERIC1 = 17,
   VERT_ATTRIB_GENERIC2 = 18,
   VERT_ATTRIB_GENERIC3 = 19,
   VERT_ATTRIB_GENERIC4 = 20,
   VERT_ATTRIB_GENERIC5 = 21,
   VERT_ATTRIB_GENERIC6 = 22,
   VERT_ATTRIB_GENERIC7 = 23,
   VERT_ATTRIB_GENERIC8 = 24,
   VERT_ATTRIB_GENERIC9 = 25,
   VERT_ATTRIB_GENERIC10 = 26,
   VERT_ATTRIB_GENERIC11 = 27,
   VERT_ATTRIB_GENERIC12 = 28,
   VERT_ATTRIB_GENERIC13 = 29,
   VERT_ATTRIB_GENERIC14 = 30,
   VERT_ATTRIB_GENERIC15 = 31,
   VERT_ATTRIB_MAX = 32
};

/**
 * Bitflags for vertex attributes.
 * These are used in bitfields in many places.
 */
/*@{*/
#define VERT_BIT_POS         (1 << VERT_ATTRIB_POS)
#define VERT_BIT_WEIGHT      (1 << VERT_ATTRIB_WEIGHT)
#define VERT_BIT_NORMAL      (1 << VERT_ATTRIB_NORMAL)
#define VERT_BIT_COLOR0      (1 << VERT_ATTRIB_COLOR0)
#define VERT_BIT_COLOR1      (1 << VERT_ATTRIB_COLOR1)
#define VERT_BIT_FOG         (1 << VERT_ATTRIB_FOG)
#define VERT_BIT_COLOR_INDEX (1 << VERT_ATTRIB_COLOR_INDEX)
#define VERT_BIT_SEVEN       (1 << VERT_ATTRIB_SEVEN)
#define VERT_BIT_TEX0        (1 << VERT_ATTRIB_TEX0)
#define VERT_BIT_TEX1        (1 << VERT_ATTRIB_TEX1)
#define VERT_BIT_TEX2        (1 << VERT_ATTRIB_TEX2)
#define VERT_BIT_TEX3        (1 << VERT_ATTRIB_TEX3)
#define VERT_BIT_TEX4        (1 << VERT_ATTRIB_TEX4)
#define VERT_BIT_TEX5        (1 << VERT_ATTRIB_TEX5)
#define VERT_BIT_TEX6        (1 << VERT_ATTRIB_TEX6)
#define VERT_BIT_TEX7        (1 << VERT_ATTRIB_TEX7)
#define VERT_BIT_GENERIC0    (1 << VERT_ATTRIB_GENERIC0)
#define VERT_BIT_GENERIC1    (1 << VERT_ATTRIB_GENERIC1)
#define VERT_BIT_GENERIC2    (1 << VERT_ATTRIB_GENERIC2)
#define VERT_BIT_GENERIC3    (1 << VERT_ATTRIB_GENERIC3)
#define VERT_BIT_GENERIC4    (1 << VERT_ATTRIB_GENERIC4)
#define VERT_BIT_GENERIC5    (1 << VERT_ATTRIB_GENERIC5)
#define VERT_BIT_GENERIC6    (1 << VERT_ATTRIB_GENERIC6)
#define VERT_BIT_GENERIC7    (1 << VERT_ATTRIB_GENERIC7)
#define VERT_BIT_GENERIC8    (1 << VERT_ATTRIB_GENERIC8)
#define VERT_BIT_GENERIC9    (1 << VERT_ATTRIB_GENERIC9)
#define VERT_BIT_GENERIC10   (1 << VERT_ATTRIB_GENERIC10)
#define VERT_BIT_GENERIC11   (1 << VERT_ATTRIB_GENERIC11)
#define VERT_BIT_GENERIC12   (1 << VERT_ATTRIB_GENERIC12)
#define VERT_BIT_GENERIC13   (1 << VERT_ATTRIB_GENERIC13)
#define VERT_BIT_GENERIC14   (1 << VERT_ATTRIB_GENERIC14)
#define VERT_BIT_GENERIC15   (1 << VERT_ATTRIB_GENERIC15)

#define VERT_BIT_TEX(u)  (1 << (VERT_ATTRIB_TEX0 + (u)))
#define VERT_BIT_GENERIC(g)  (1 << (VERT_ATTRIB_GENERIC0 + (g)))
/*@}*/

/**
 * GLSL allows shader writers to allocate vertex result attributes (varyings) in
 * single float component granularity. This is in contrast to vertex / fragment
 * programs, where result attributes (actually texcoords) were allocated
 * in 4-component vectors of floats granularity.
 * For performance reasons, it would be optimal to stick with this scheme on a scalar
 * processor. Varyings will likely be allocated as 3-component vectors, so statistically
 * we win 2 floats.
 * The constant VARYINGS_PER_VECTOR tells us how much of float components we pack into
 * one result vector. For scalar processor it would be 1, for vector processor - 4.
 * 
 * NOTE: Currently we pack varyings into vertex attributes.
 */
#define VARYINGS_PER_VECTOR 2
#define VARYING_EMIT_STYLE  EMIT_2F
#define MAX_VARYING_VECTORS ((MAX_VARYING_FLOATS + VARYINGS_PER_VECTOR - 1) / VARYINGS_PER_VECTOR)

/**
 * Indexes for vertex program result attributes
 */
/*@{*/
#define VERT_RESULT_HPOS 0
#define VERT_RESULT_COL0 1
#define VERT_RESULT_COL1 2
#define VERT_RESULT_FOGC 3
#define VERT_RESULT_TEX0 4
#define VERT_RESULT_TEX1 5
#define VERT_RESULT_TEX2 6
#define VERT_RESULT_TEX3 7
#define VERT_RESULT_TEX4 8
#define VERT_RESULT_TEX5 9
#define VERT_RESULT_TEX6 10
#define VERT_RESULT_TEX7 11
#define VERT_RESULT_PSIZ 12
#define VERT_RESULT_BFC0 13
#define VERT_RESULT_BFC1 14
#define VERT_RESULT_EDGE 15
#define VERT_RESULT_MAX  16
/*@}*/


/**
 * Indexes for fragment program input attributes.
 */
enum
{
   FRAG_ATTRIB_WPOS = 0,
   FRAG_ATTRIB_COL0 = 1,
   FRAG_ATTRIB_COL1 = 2,
   FRAG_ATTRIB_FOGC = 3,
   FRAG_ATTRIB_TEX0 = 4,
   FRAG_ATTRIB_TEX1 = 5,
   FRAG_ATTRIB_TEX2 = 6,
   FRAG_ATTRIB_TEX3 = 7,
   FRAG_ATTRIB_TEX4 = 8,
   FRAG_ATTRIB_TEX5 = 9,
   FRAG_ATTRIB_TEX6 = 10,
   FRAG_ATTRIB_TEX7 = 11,
   FRAG_ATTRIB_MAX = 12
};

/**
 * Bitflags for fragment program input attributes.
 */
/*@{*/
#define FRAG_BIT_WPOS  (1 << FRAG_ATTRIB_WPOS)
#define FRAG_BIT_COL0  (1 << FRAG_ATTRIB_COL0)
#define FRAG_BIT_COL1  (1 << FRAG_ATTRIB_COL1)
#define FRAG_BIT_FOGC  (1 << FRAG_ATTRIB_FOGC)
#define FRAG_BIT_TEX0  (1 << FRAG_ATTRIB_TEX0)
#define FRAG_BIT_TEX1  (1 << FRAG_ATTRIB_TEX1)
#define FRAG_BIT_TEX2  (1 << FRAG_ATTRIB_TEX2)
#define FRAG_BIT_TEX3  (1 << FRAG_ATTRIB_TEX3)
#define FRAG_BIT_TEX4  (1 << FRAG_ATTRIB_TEX4)
#define FRAG_BIT_TEX5  (1 << FRAG_ATTRIB_TEX5)
#define FRAG_BIT_TEX6  (1 << FRAG_ATTRIB_TEX6)
#define FRAG_BIT_TEX7  (1 << FRAG_ATTRIB_TEX7)

#define FRAG_BITS_TEX_ANY (FRAG_BIT_TEX0|       \
                           FRAG_BIT_TEX1|       \
                           FRAG_BIT_TEX2|       \
                           FRAG_BIT_TEX3|       \
                           FRAG_BIT_TEX4|       \
                           FRAG_BIT_TEX5|       \
                           FRAG_BIT_TEX6|       \
                           FRAG_BIT_TEX7)
/*@}*/


/**
 * Fragment program results
 */
/*@{*/
#define FRAG_RESULT_COLR  0
#define FRAG_RESULT_COLH  1
#define FRAG_RESULT_DEPR  2
#define FRAG_RESULT_MAX   3
/*@}*/


/**
 * Indexes for all renderbuffers
 */
enum {
   BUFFER_FRONT_LEFT  = 0,  /* the four standard color buffers */
   BUFFER_BACK_LEFT   = 1,
   BUFFER_FRONT_RIGHT = 2,
   BUFFER_BACK_RIGHT  = 3,
   BUFFER_AUX0        = 4,  /* optional aux buffer */
   BUFFER_AUX1        = 5,
   BUFFER_AUX2        = 6,
   BUFFER_AUX3        = 7,
   BUFFER_DEPTH       = 8,
   BUFFER_STENCIL     = 9,
   BUFFER_ACCUM       = 10,
   BUFFER_COLOR0      = 11, /* generic renderbuffers */
   BUFFER_COLOR1      = 12,
   BUFFER_COLOR2      = 13,
   BUFFER_COLOR3      = 14,
   BUFFER_COLOR4      = 15,
   BUFFER_COLOR5      = 16,
   BUFFER_COLOR6      = 17,
   BUFFER_COLOR7      = 18,
   BUFFER_COUNT       = 19
};

/**
 * Bit flags for all renderbuffers
 */
#define BUFFER_BIT_FRONT_LEFT   (1 << BUFFER_FRONT_LEFT)
#define BUFFER_BIT_BACK_LEFT    (1 << BUFFER_BACK_LEFT)
#define BUFFER_BIT_FRONT_RIGHT  (1 << BUFFER_FRONT_RIGHT)
#define BUFFER_BIT_BACK_RIGHT   (1 << BUFFER_BACK_RIGHT)
#define BUFFER_BIT_AUX0         (1 << BUFFER_AUX0)
#define BUFFER_BIT_AUX1         (1 << BUFFER_AUX1)
#define BUFFER_BIT_AUX2         (1 << BUFFER_AUX2)
#define BUFFER_BIT_AUX3         (1 << BUFFER_AUX3)
#define BUFFER_BIT_DEPTH        (1 << BUFFER_DEPTH)
#define BUFFER_BIT_STENCIL      (1 << BUFFER_STENCIL)
#define BUFFER_BIT_ACCUM        (1 << BUFFER_ACCUM)
#define BUFFER_BIT_COLOR0       (1 << BUFFER_COLOR0)
#define BUFFER_BIT_COLOR1       (1 << BUFFER_COLOR1)
#define BUFFER_BIT_COLOR2       (1 << BUFFER_COLOR2)
#define BUFFER_BIT_COLOR3       (1 << BUFFER_COLOR3)
#define BUFFER_BIT_COLOR4       (1 << BUFFER_COLOR4)
#define BUFFER_BIT_COLOR5       (1 << BUFFER_COLOR5)
#define BUFFER_BIT_COLOR6       (1 << BUFFER_COLOR6)
#define BUFFER_BIT_COLOR7       (1 << BUFFER_COLOR7)

/**
 * Mask of all the color buffer bits (but not accum).
 */
#define BUFFER_BITS_COLOR  (BUFFER_BIT_FRONT_LEFT | \
                            BUFFER_BIT_BACK_LEFT | \
                            BUFFER_BIT_FRONT_RIGHT | \
                            BUFFER_BIT_BACK_RIGHT | \
                            BUFFER_BIT_AUX0 | \
                            BUFFER_BIT_AUX1 | \
                            BUFFER_BIT_AUX2 | \
                            BUFFER_BIT_AUX3 | \
                            BUFFER_BIT_COLOR0 | \
                            BUFFER_BIT_COLOR1 | \
                            BUFFER_BIT_COLOR2 | \
                            BUFFER_BIT_COLOR3 | \
                            BUFFER_BIT_COLOR4 | \
                            BUFFER_BIT_COLOR5 | \
                            BUFFER_BIT_COLOR6 | \
                            BUFFER_BIT_COLOR7)




/**
 * Data structure for color tables
 */
struct gl_color_table
{
   GLenum InternalFormat;      /**< The user-specified format */
   GLenum _BaseFormat;         /**< GL_ALPHA, GL_RGBA, GL_RGB, etc */
   GLuint Size;           /**< number of entries (rows) in table */
   GLvoid *Table;         /**< points to data of <Type> */
   GLenum Type;           /**< GL_UNSIGNED_BYTE or GL_FLOAT */
   GLubyte RedSize;
   GLubyte GreenSize;
   GLubyte BlueSize;
   GLubyte AlphaSize;
   GLubyte LuminanceSize;
   GLubyte IntensitySize;
};


/**
 * \name Bit flags used for updating material values.
 */
/*@{*/
#define MAT_ATTRIB_FRONT_AMBIENT           0 
#define MAT_ATTRIB_BACK_AMBIENT            1
#define MAT_ATTRIB_FRONT_DIFFUSE           2 
#define MAT_ATTRIB_BACK_DIFFUSE            3
#define MAT_ATTRIB_FRONT_SPECULAR          4 
#define MAT_ATTRIB_BACK_SPECULAR           5
#define MAT_ATTRIB_FRONT_EMISSION          6
#define MAT_ATTRIB_BACK_EMISSION           7
#define MAT_ATTRIB_FRONT_SHININESS         8
#define MAT_ATTRIB_BACK_SHININESS          9
#define MAT_ATTRIB_FRONT_INDEXES           10
#define MAT_ATTRIB_BACK_INDEXES            11
#define MAT_ATTRIB_MAX                     12

#define MAT_ATTRIB_AMBIENT(f)  (MAT_ATTRIB_FRONT_AMBIENT+(f))  
#define MAT_ATTRIB_DIFFUSE(f)  (MAT_ATTRIB_FRONT_DIFFUSE+(f))  
#define MAT_ATTRIB_SPECULAR(f) (MAT_ATTRIB_FRONT_SPECULAR+(f)) 
#define MAT_ATTRIB_EMISSION(f) (MAT_ATTRIB_FRONT_EMISSION+(f)) 
#define MAT_ATTRIB_SHININESS(f)(MAT_ATTRIB_FRONT_SHININESS+(f))
#define MAT_ATTRIB_INDEXES(f)  (MAT_ATTRIB_FRONT_INDEXES+(f))  

#define MAT_INDEX_AMBIENT  0
#define MAT_INDEX_DIFFUSE  1
#define MAT_INDEX_SPECULAR 2

#define MAT_BIT_FRONT_AMBIENT         (1<<MAT_ATTRIB_FRONT_AMBIENT)
#define MAT_BIT_BACK_AMBIENT          (1<<MAT_ATTRIB_BACK_AMBIENT)
#define MAT_BIT_FRONT_DIFFUSE         (1<<MAT_ATTRIB_FRONT_DIFFUSE)
#define MAT_BIT_BACK_DIFFUSE          (1<<MAT_ATTRIB_BACK_DIFFUSE)
#define MAT_BIT_FRONT_SPECULAR        (1<<MAT_ATTRIB_FRONT_SPECULAR)
#define MAT_BIT_BACK_SPECULAR         (1<<MAT_ATTRIB_BACK_SPECULAR)
#define MAT_BIT_FRONT_EMISSION        (1<<MAT_ATTRIB_FRONT_EMISSION)
#define MAT_BIT_BACK_EMISSION         (1<<MAT_ATTRIB_BACK_EMISSION)
#define MAT_BIT_FRONT_SHININESS       (1<<MAT_ATTRIB_FRONT_SHININESS)
#define MAT_BIT_BACK_SHININESS        (1<<MAT_ATTRIB_BACK_SHININESS)
#define MAT_BIT_FRONT_INDEXES         (1<<MAT_ATTRIB_FRONT_INDEXES)
#define MAT_BIT_BACK_INDEXES          (1<<MAT_ATTRIB_BACK_INDEXES)


#define FRONT_MATERIAL_BITS     (MAT_BIT_FRONT_EMISSION |       \
                                 MAT_BIT_FRONT_AMBIENT |        \
                                 MAT_BIT_FRONT_DIFFUSE |        \
                                 MAT_BIT_FRONT_SPECULAR |       \
                                 MAT_BIT_FRONT_SHININESS |      \
                                 MAT_BIT_FRONT_INDEXES)

#define BACK_MATERIAL_BITS      (MAT_BIT_BACK_EMISSION |        \
                                 MAT_BIT_BACK_AMBIENT |         \
                                 MAT_BIT_BACK_DIFFUSE |         \
                                 MAT_BIT_BACK_SPECULAR |        \
                                 MAT_BIT_BACK_SHININESS |       \
                                 MAT_BIT_BACK_INDEXES)

#define ALL_MATERIAL_BITS       (FRONT_MATERIAL_BITS | BACK_MATERIAL_BITS)
/*@}*/


#define EXP_TABLE_SIZE 512      /**< Specular exponent lookup table sizes */
#define SHINE_TABLE_SIZE 256    /**< Material shininess lookup table sizes */

/**
 * Material shininess lookup table.
 */
struct gl_shine_tab
{
   struct gl_shine_tab *next, *prev;
   GLfloat tab[SHINE_TABLE_SIZE+1];
   GLfloat shininess;
   GLuint refcount;
};


/**
 * Light source state.
 */
struct gl_light
{
   struct gl_light *next;       /**< double linked list with sentinel */
   struct gl_light *prev;

   GLfloat Ambient[4];          /**< ambient color */
   GLfloat Diffuse[4];          /**< diffuse color */
   GLfloat Specular[4];         /**< specular color */
   GLfloat EyePosition[4];      /**< position in eye coordinates */
   GLfloat EyeDirection[4];     /**< spotlight dir in eye coordinates */
   GLfloat SpotExponent;
   GLfloat SpotCutoff;          /**< in degrees */
   GLfloat _CosCutoffNeg;       /**< = cos(SpotCutoff) */
   GLfloat _CosCutoff;          /**< = MAX(0, cos(SpotCutoff)) */
   GLfloat ConstantAttenuation;
   GLfloat LinearAttenuation;
   GLfloat QuadraticAttenuation;
   GLboolean Enabled;           /**< On/off flag */

   /** 
    * \name Derived fields
    */
   /*@{*/
   GLbitfield _Flags;           /**< State */

   GLfloat _Position[4];        /**< position in eye/obj coordinates */
   GLfloat _VP_inf_norm[3];     /**< Norm direction to infinite light */
   GLfloat _h_inf_norm[3];      /**< Norm( _VP_inf_norm + <0,0,1> ) */
   GLfloat _NormDirection[4];   /**< normalized spotlight direction */
   GLfloat _VP_inf_spot_attenuation;

   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 */
   /*@}*/
};


/**
 * Light model state.
 */
struct gl_lightmodel
{
   GLfloat Ambient[4];          /**< ambient color */
   GLboolean LocalViewer;       /**< Local (or infinite) view point? */
   GLboolean TwoSide;           /**< Two (or one) sided lighting? */
   GLenum ColorControl;         /**< either GL_SINGLE_COLOR
                                 *    or GL_SEPARATE_SPECULAR_COLOR */
};


/**
 * Material state.
 */
struct gl_material
{
   GLfloat Attrib[MAT_ATTRIB_MAX][4];
};


/**
 * Accumulation buffer attribute group (GL_ACCUM_BUFFER_BIT)
 */
struct gl_accum_attrib
{
   GLfloat ClearColor[4];       /**< Accumulation buffer clear color */
};


/**
 * Color buffer attribute group (GL_COLOR_BUFFER_BIT).
 */
struct gl_colorbuffer_attrib
{
   GLuint ClearIndex;                   /**< Index to use for glClear */
   GLclampf ClearColor[4];              /**< Color to use for glClear */

   GLuint IndexMask;                    /**< Color index write mask */
   GLubyte ColorMask[4];                /**< Each flag is 0xff or 0x0 */

   GLenum DrawBuffer[MAX_DRAW_BUFFERS]; /**< Which buffer to draw into */

   /** 
    * \name alpha testing
    */
   /*@{*/
   GLboolean AlphaEnabled;              /**< Alpha test enabled flag */
   GLenum AlphaFunc;                    /**< Alpha test function */
   GLclampf AlphaRef;                   /**< Alpha reference value */
   /*@}*/

   /** 
    * \name Blending
    */
   /*@{*/
   GLboolean BlendEnabled;              /**< Blending enabled flag */
   GLenum BlendSrcRGB;                  /**< Blending source operator */
   GLenum BlendDstRGB;                  /**< Blending destination operator */
   GLenum BlendSrcA;                    /**< GL_INGR_blend_func_separate */
   GLenum BlendDstA;                    /**< GL_INGR_blend_func_separate */
   GLenum BlendEquationRGB;             /**< Blending equation */
   GLenum BlendEquationA;               /**< GL_EXT_blend_equation_separate */
   GLfloat BlendColor[4];               /**< Blending color */
   /*@}*/

   /** 
    * \name Logic op
    */
   /*@{*/
   GLenum LogicOp;                      /**< Logic operator */
   GLboolean IndexLogicOpEnabled;       /**< Color index logic op enabled flag */
   GLboolean ColorLogicOpEnabled;       /**< RGBA logic op enabled flag */
   GLboolean _LogicOpEnabled;           /**< RGBA logic op + EXT_blend_logic_op enabled flag */
   /*@}*/

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

   GLenum ClampFragmentColor; /**< GL_TRUE, GL_FALSE or GL_FIXED_ONLY_ARB */
   GLenum ClampReadColor;     /**< GL_TRUE, GL_FALSE or GL_FIXED_ONLY_ARB */
};


/**
 * Current attribute group (GL_CURRENT_BIT).
 */
struct gl_current_attrib
{
   /**
    * \name Current vertex attributes.
    * \note Values are valid only after FLUSH_VERTICES has been called.
    */
   /*@{*/
   GLfloat Attrib[VERT_ATTRIB_MAX][4];  /**< Position, color, texcoords, etc */
   GLfloat Index;                       /**< Current color index */
   GLboolean EdgeFlag;                  /**< Current edge flag */
   /*@}*/

   /**
    * \name Current raster position attributes (always valid).
    * \note This set of attributes is very similar to the SWvertex struct.
    */
   /*@{*/
   GLfloat RasterPos[4];
   GLfloat RasterDistance;
   GLfloat RasterColor[4];
   GLfloat RasterSecondaryColor[4];
   GLfloat RasterIndex;
   GLfloat RasterTexCoords[MAX_TEXTURE_COORD_UNITS][4];
   GLboolean RasterPosValid;
   /*@}*/
};


/**
 * Depth buffer attribute group (GL_DEPTH_BUFFER_BIT).
 */
struct gl_depthbuffer_attrib
{
   GLenum Func;                 /**< Function for depth buffer compare */
   GLclampd Clear;              /**< Value to clear depth buffer to */
   GLboolean Test;              /**< Depth buffering enabled flag */
   GLboolean Mask;              /**< Depth buffer writable? */
   GLboolean BoundsTest;        /**< GL_EXT_depth_bounds_test */
   GLfloat BoundsMin, BoundsMax;/**< GL_EXT_depth_bounds_test */
};


/**
 * glEnable()/glDisable() attribute group (GL_ENABLE_BIT).
 */
struct gl_enable_attrib
{
   GLboolean AlphaTest;
   GLboolean AutoNormal;
   GLboolean Blend;
   GLbitfield ClipPlanes;
   GLboolean ColorMaterial;
   GLboolean ColorTable;                /* SGI_color_table */
   GLboolean PostColorMatrixColorTable; /* SGI_color_table */
   GLboolean PostConvolutionColorTable; /* SGI_color_table */
   GLboolean Convolution1D;
   GLboolean Convolution2D;
   GLboolean Separable2D;
   GLboolean CullFace;
   GLboolean DepthTest;
   GLboolean Dither;
   GLboolean Fog;
   GLboolean Histogram;
   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 Map1Attrib[16];  /* GL_NV_vertex_program */
   GLboolean Map2Color4;
   GLboolean Map2Index;
   GLboolean Map2Normal;
   GLboolean Map2TextureCoord1;
   GLboolean Map2TextureCoord2;
   GLboolean Map2TextureCoord3;
   GLboolean Map2TextureCoord4;
   GLboolean Map2Vertex3;
   GLboolean Map2Vertex4;
   GLboolean Map2Attrib[16];  /* GL_NV_vertex_program */
   GLboolean MinMax;
   GLboolean Normalize;
   GLboolean PixelTexture;
   GLboolean PointSmooth;
   GLboolean PolygonOffsetPoint;
   GLboolean PolygonOffsetLine;
   GLboolean PolygonOffsetFill;
   GLboolean PolygonSmooth;
   GLboolean PolygonStipple;
   GLboolean RescaleNormals;
   GLboolean Scissor;
   GLboolean Stencil;
   GLboolean StencilTwoSide;          /* GL_EXT_stencil_two_side */
   GLboolean MultisampleEnabled;      /* GL_ARB_multisample */
   GLboolean SampleAlphaToCoverage;   /* GL_ARB_multisample */
   GLboolean SampleAlphaToOne;        /* GL_ARB_multisample */
   GLboolean SampleCoverage;          /* GL_ARB_multisample */
   GLboolean SampleCoverageInvert;    /* GL_ARB_multisample */
   GLboolean RasterPositionUnclipped; /* GL_IBM_rasterpos_clip */
   GLuint Texture[MAX_TEXTURE_IMAGE_UNITS];
   GLuint TexGen[MAX_TEXTURE_COORD_UNITS];
   /* SGI_texture_color_table */
   GLboolean TextureColorTable[MAX_TEXTURE_IMAGE_UNITS];
   /* GL_ARB_vertex_program / GL_NV_vertex_program */
   GLboolean VertexProgram;
   GLboolean VertexProgramPointSize;
   GLboolean VertexProgramTwoSide;
   /* GL_ARB_point_sprite / GL_NV_point_sprite */
   GLboolean PointSprite;
   GLboolean FragmentShaderATI;
};


/**
 * Evaluator attribute group (GL_EVAL_BIT).
 */
struct gl_eval_attrib
{
   /**
    * \name Enable bits 
    */
   /*@{*/
   GLboolean Map1Color4;
   GLboolean Map1Index;
   GLboolean Map1Normal;
   GLboolean Map1TextureCoord1;
   GLboolean Map1TextureCoord2;
   GLboolean Map1TextureCoord3;
   GLboolean Map1TextureCoord4;
   GLboolean Map1Vertex3;
   GLboolean Map1Vertex4;
   GLboolean Map1Attrib[16];  /* GL_NV_vertex_program */
   GLboolean Map2Color4;
   GLboolean Map2Index;
   GLboolean Map2Normal;
   GLboolean Map2TextureCoord1;
   GLboolean Map2TextureCoord2;
   GLboolean Map2TextureCoord3;
   GLboolean Map2TextureCoord4;
   GLboolean Map2Vertex3;
   GLboolean Map2Vertex4;
   GLboolean Map2Attrib[16];  /* GL_NV_vertex_program */
   GLboolean AutoNormal;
   /*@}*/
   
   /**
    * \name Map Grid endpoints and divisions and calculated du values
    */
   /*@{*/
   GLint MapGrid1un;
   GLfloat MapGrid1u1, MapGrid1u2, MapGrid1du;
   GLint MapGrid2un, MapGrid2vn;
   GLfloat MapGrid2u1, MapGrid2u2, MapGrid2du;
   GLfloat MapGrid2v1, MapGrid2v2, MapGrid2dv;
   /*@}*/
};


/**
 * Fog attribute group (GL_FOG_BIT).
 */
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 */
   GLboolean ColorSumEnabled;
   GLenum FogCoordinateSource;  /**< GL_EXT_fog_coord */
   GLfloat _Scale;              /**< (End == Start) ? 1.0 : 1.0 / (End - Start) */
};


/** 
 * Hint attribute group (GL_HINT_BIT).
 * 
 * Values are always one of GL_FASTEST, GL_NICEST, or GL_DONT_CARE.
 */
struct gl_hint_attrib
{
   GLenum PerspectiveCorrection;
   GLenum PointSmooth;
   GLenum LineSmooth;
   GLenum PolygonSmooth;
   GLenum Fog;
   GLenum ClipVolumeClipping;   /**< GL_EXT_clip_volume_hint */
   GLenum TextureCompression;   /**< GL_ARB_texture_compression */
   GLenum GenerateMipmap;       /**< GL_SGIS_generate_mipmap */
   GLenum FragmentShaderDerivative; /**< GL_ARB_fragment_shader */
};


/**
 * Histogram attributes.
 */
struct gl_histogram_attrib
{
   GLuint Width;                                /**< number of table entries */
   GLint Format;                                /**< GL_ALPHA, GL_RGB, etc */
   GLuint Count[HISTOGRAM_TABLE_SIZE][4];       /**< the histogram */
   GLboolean Sink;                              /**< terminate image transfer? */
   GLubyte RedSize;                             /**< Bits per counter */
   GLubyte GreenSize;
   GLubyte BlueSize;
   GLubyte AlphaSize;
   GLubyte LuminanceSize;
};


/**
 * Color Min/max state.
 */
struct gl_minmax_attrib
{
   GLenum Format;
   GLboolean Sink;
   GLfloat Min[4], Max[4];   /**< RGBA */
};


/**
 * Image convolution state.
 */
struct gl_convolution_attrib
{
   GLenum Format;
   GLenum InternalFormat;
   GLuint Width;
   GLuint Height;
   GLfloat Filter[MAX_CONVOLUTION_WIDTH * MAX_CONVOLUTION_HEIGHT * 4];
};


/**
 * Light state flags.
 */
/*@{*/
#define LIGHT_SPOT         0x1
#define LIGHT_LOCAL_VIEWER 0x2
#define LIGHT_POSITIONAL   0x4
#define LIGHT_NEED_VERTICES (LIGHT_POSITIONAL|LIGHT_LOCAL_VIEWER)
/*@}*/


/**
 * Lighting attribute group (GL_LIGHT_BIT).
 */
struct gl_light_attrib
{
   struct gl_light Light[MAX_LIGHTS];   /**< Array of light sources */
   struct gl_lightmodel Model;          /**< Lighting model */

   /**
    * Must flush FLUSH_VERTICES before referencing:
    */
   /*@{*/
   struct gl_material Material;         /**< Includes front & back values */
   /*@}*/

   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 */
   GLbitfield ColorMaterialBitmask;     /**< bitmask formed from Face and Mode */
   GLboolean ColorMaterialEnabled;

   struct gl_light EnabledList;         /**< List sentinel */

   /** 
    * Derived state for optimizations: 
    */
   /*@{*/
   GLboolean _NeedEyeCoords;            
   GLboolean _NeedVertices;             /**< Use fast shader? */
   GLbitfield  _Flags;                  /**< LIGHT_* flags, see above */
   GLfloat _BaseColor[2][3];
   /*@}*/
};


/**
 * Line attribute group (GL_LINE_BIT).
 */
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 */
   GLfloat _Width;              /**< Clamped Line width */
};


/**
 * Display list attribute group (GL_LIST_BIT).
 */
struct gl_list_attrib
{
   GLuint ListBase;
};


/**
 * Used by device drivers to hook new commands into display lists.
 */
struct gl_list_instruction
{
   GLuint Size;
   void (*Execute)( GLcontext *ctx, void *data );
   void (*Destroy)( GLcontext *ctx, void *data );
   void (*Print)( GLcontext *ctx, void *data );
};

#define MAX_DLIST_EXT_OPCODES 16

/**
 * Used by device drivers to hook new commands into display lists.
 */
struct gl_list_extensions
{
   struct gl_list_instruction Opcode[MAX_DLIST_EXT_OPCODES];
   GLuint NumOpcodes;
};


/**
 * Multisample attribute group (GL_MULTISAMPLE_BIT).
 */
struct gl_multisample_attrib
{
   GLboolean Enabled;
   GLboolean SampleAlphaToCoverage;
   GLboolean SampleAlphaToOne;
   GLboolean SampleCoverage;
   GLfloat SampleCoverageValue;
   GLboolean SampleCoverageInvert;
};


/**
 * Pixel attribute group (GL_PIXEL_MODE_BIT).
 */
struct gl_pixel_attrib
{
   GLenum ReadBuffer;           /**< source buffer for glRead/CopyPixels() */
   GLfloat RedBias, RedScale;
   GLfloat GreenBias, GreenScale;
   GLfloat BlueBias, BlueScale;
   GLfloat AlphaBias, AlphaScale;
   GLfloat DepthBias, DepthScale;
   GLint IndexShift, IndexOffset;
   GLboolean MapColorFlag;
   GLboolean MapStencilFlag;
   GLfloat ZoomX, ZoomY;
   /* XXX move these out of gl_pixel_attrib */
   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 */
   GLfloat 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];
   GLubyte MapItoR8[MAX_PIXEL_MAP_TABLE];  /**< converted to 8-bit color */
   GLubyte MapItoG8[MAX_PIXEL_MAP_TABLE];
   GLubyte MapItoB8[MAX_PIXEL_MAP_TABLE];
   GLubyte MapItoA8[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];
   /** GL_EXT_histogram */
   GLboolean HistogramEnabled;
   GLboolean MinMaxEnabled;
   /** GL_SGI_color_matrix */
   GLfloat PostColorMatrixScale[4];  /**< RGBA */
   GLfloat PostColorMatrixBias[4];   /**< RGBA */
   /** GL_SGI_color_table */
   GLfloat ColorTableScale[4];
   GLfloat ColorTableBias[4];
   GLboolean ColorTableEnabled;
   GLfloat PCCTscale[4];
   GLfloat PCCTbias[4];
   GLboolean PostConvolutionColorTableEnabled;
   GLfloat PCMCTscale[4];
   GLfloat PCMCTbias[4];
   GLboolean PostColorMatrixColorTableEnabled;
   /** GL_SGI_texture_color_table */
   GLfloat TextureColorTableScale[4];
   GLfloat TextureColorTableBias[4];
   /** Convolution */
   GLboolean Convolution1DEnabled;
   GLboolean Convolution2DEnabled;
   GLboolean Separable2DEnabled;
   GLfloat ConvolutionBorderColor[3][4];
   GLenum ConvolutionBorderMode[3];
   GLfloat ConvolutionFilterScale[3][4];
   GLfloat ConvolutionFilterBias[3][4];
   GLfloat PostConvolutionScale[4];  /**< RGBA */
   GLfloat PostConvolutionBias[4];   /**< RGBA */
};


/**
 * Point attribute group (GL_POINT_BIT).
 */
struct gl_point_attrib
{
   GLboolean SmoothFlag;        /**< True if GL_POINT_SMOOTH is enabled */
   GLfloat Size;                /**< User-specified point size */
   GLfloat _Size;               /**< Size clamped to Const.Min/MaxPointSize */
   GLfloat Params[3];           /**< GL_EXT_point_parameters */
   GLfloat MinSize, MaxSize;    /**< GL_EXT_point_parameters */
   GLfloat Threshold;           /**< GL_EXT_point_parameters */
   GLboolean _Attenuated;       /**< True if Params != [1, 0, 0] */
   GLboolean PointSprite;       /**< GL_NV/ARB_point_sprite */
   GLboolean CoordReplace[MAX_TEXTURE_COORD_UNITS]; /**< GL_ARB_point_sprite */
   GLenum SpriteRMode;          /**< GL_NV_point_sprite (only!) */
   GLenum SpriteOrigin;         /**< GL_ARB_point_sprite */
};


/**
 * Polygon attribute group (GL_POLYGON_BIT).
 */
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 _FrontBit;         /**< 0=GL_CCW, 1=GL_CW */
   GLboolean CullFlag;          /**< Culling on/off flag */
   GLboolean SmoothFlag;        /**< True if GL_POLYGON_SMOOTH is enabled */
   GLboolean StippleFlag;       /**< True if GL_POLYGON_STIPPLE is enabled */
   GLenum CullFaceMode;         /**< Culling mode GL_FRONT or GL_BACK */
   GLfloat OffsetFactor;        /**< Polygon offset factor, from user */
   GLfloat OffsetUnits;         /**< Polygon offset units, from user */
   GLboolean OffsetPoint;       /**< Offset in GL_POINT mode */
   GLboolean OffsetLine;        /**< Offset in GL_LINE mode */
   GLboolean OffsetFill;        /**< Offset in GL_FILL mode */
};


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


/**
 * Stencil attribute group (GL_STENCIL_BUFFER_BIT).
 */
struct gl_stencil_attrib
{
   GLboolean Enabled;           /**< Enabled flag */
   GLboolean TestTwoSide;       /**< GL_EXT_stencil_two_side */
   GLubyte ActiveFace;          /**< GL_EXT_stencil_two_side (0 or 1) */
   GLboolean _TestTwoSide;
   GLenum Function[2];          /**< Stencil function */
   GLenum FailFunc[2];          /**< Fail function */
   GLenum ZPassFunc[2];         /**< Depth buffer pass function */
   GLenum ZFailFunc[2];         /**< Depth buffer fail function */
   GLint Ref[2];                /**< Reference value */
   GLuint ValueMask[2];         /**< Value mask */
   GLuint WriteMask[2];         /**< Write mask */
   GLuint Clear;                /**< Clear value */
};


#define NUM_TEXTURE_TARGETS 5   /* 1D, 2D, 3D, CUBE and RECT */

/**
 * An index for each type of texture object
 */
/*@{*/
#define TEXTURE_1D_INDEX    0
#define TEXTURE_2D_INDEX    1
#define TEXTURE_3D_INDEX    2
#define TEXTURE_CUBE_INDEX  3
#define TEXTURE_RECT_INDEX  4
/*@}*/

/**
 * Bit flags for each type of texture object
 * Used for Texture.Unit[]._ReallyEnabled flags.
 */
/*@{*/
#define TEXTURE_1D_BIT   (1 << TEXTURE_1D_INDEX)
#define TEXTURE_2D_BIT   (1 << TEXTURE_2D_INDEX)
#define TEXTURE_3D_BIT   (1 << TEXTURE_3D_INDEX)
#define TEXTURE_CUBE_BIT (1 << TEXTURE_CUBE_INDEX)
#define TEXTURE_RECT_BIT (1 << TEXTURE_RECT_INDEX)
/*@}*/


/**
 * TexGenEnabled flags.
 */
/*@{*/
#define S_BIT 1
#define T_BIT 2
#define R_BIT 4
#define Q_BIT 8
/*@}*/


/**
 * Bit flag versions of the corresponding GL_ constants.
 */
/*@{*/
#define TEXGEN_SPHERE_MAP        0x1
#define TEXGEN_OBJ_LINEAR        0x2
#define TEXGEN_EYE_LINEAR        0x4
#define TEXGEN_REFLECTION_MAP_NV 0x8
#define TEXGEN_NORMAL_MAP_NV     0x10

#define TEXGEN_NEED_NORMALS      (TEXGEN_SPHERE_MAP        | \
                                  TEXGEN_REFLECTION_MAP_NV | \
                                  TEXGEN_NORMAL_MAP_NV)
#define TEXGEN_NEED_EYE_COORD    (TEXGEN_SPHERE_MAP        | \
                                  TEXGEN_REFLECTION_MAP_NV | \
                                  TEXGEN_NORMAL_MAP_NV     | \
                                  TEXGEN_EYE_LINEAR)
/*@}*/


/* A selection of state flags to make driver and module's lives easier. */
#define ENABLE_TEXGEN0        0x1
#define ENABLE_TEXGEN1        0x2
#define ENABLE_TEXGEN2        0x4
#define ENABLE_TEXGEN3        0x8
#define ENABLE_TEXGEN4        0x10
#define ENABLE_TEXGEN5        0x20
#define ENABLE_TEXGEN6        0x40
#define ENABLE_TEXGEN7        0x80

#define ENABLE_TEXMAT0        0x1       /* Ie. not the identity matrix */
#define ENABLE_TEXMAT1        0x2
#define ENABLE_TEXMAT2        0x4
#define ENABLE_TEXMAT3        0x8
#define ENABLE_TEXMAT4        0x10
#define ENABLE_TEXMAT5        0x20
#define ENABLE_TEXMAT6        0x40
#define ENABLE_TEXMAT7        0x80

#define ENABLE_TEXGEN(i) (ENABLE_TEXGEN0 << (i))
#define ENABLE_TEXMAT(i) (ENABLE_TEXMAT0 << (i))


/**
 * Texel fetch function prototype.  We use texel fetch functions to
 * extract RGBA, color indexes and depth components out of 1D, 2D and 3D
 * texture images.  These functions help to isolate us from the gritty
 * details of all the various texture image encodings.
 * 
 * \param texImage texture image.
 * \param col texel column.
 * \param row texel row.
 * \param img texel image level/layer.
 * \param texelOut output texel (up to 4 GLchans)
 */
typedef void (*FetchTexelFuncC)( const struct gl_texture_image *texImage,
                                 GLint col, GLint row, GLint img,
                                 GLchan *texelOut );

/**
 * As above, but returns floats.
 * Used for depth component images and for upcoming signed/float
 * texture images.
 */
typedef void (*FetchTexelFuncF)( const struct gl_texture_image *texImage,
                                 GLint col, GLint row, GLint img,
                                 GLfloat *texelOut );


typedef void (*StoreTexelFunc)(struct gl_texture_image *texImage,
                               GLint col, GLint row, GLint img,
                               const void *texel);

/**
 * TexImage store function.  This is called by the glTex[Sub]Image
 * functions and is responsible for converting the user-specified texture
 * image into a specific (hardware) image format.
 */
typedef GLboolean (*StoreTexImageFunc)(GLcontext *ctx, GLuint dims,
                          GLenum baseInternalFormat,
                          const struct gl_texture_format *dstFormat,
                          GLvoid *dstAddr,
                          GLint dstXoffset, GLint dstYoffset, GLint dstZoffset,
                          GLint dstRowStride, GLint dstImageStride,
                          GLint srcWidth, GLint srcHeight, GLint srcDepth,
                          GLenum srcFormat, GLenum srcType,
                          const GLvoid *srcAddr,
                          const struct gl_pixelstore_attrib *srcPacking);



/**
 * Texture format record 
 */
struct gl_texture_format
{
   GLint MesaFormat;            /**< One of the MESA_FORMAT_* values */

   GLenum BaseFormat;           /**< Either GL_RGB, GL_RGBA, GL_ALPHA,
                                 *   GL_LUMINANCE, GL_LUMINANCE_ALPHA,
                                 *   GL_INTENSITY, GL_COLOR_INDEX or
                                 *   GL_DEPTH_COMPONENT.
                                 */
   GLenum DataType;             /**< GL_FLOAT or GL_UNSIGNED_NORMALIZED_ARB */
   GLubyte RedBits;             /**< Bits per texel component */
   GLubyte GreenBits;           /**< These are just rough approximations for */
   GLubyte BlueBits;            /**< compressed texture formats. */
   GLubyte AlphaBits;
   GLubyte LuminanceBits;
   GLubyte IntensityBits;
   GLubyte IndexBits;
   GLubyte DepthBits;
   GLubyte StencilBits;         /**< GL_EXT_packed_depth_stencil */

   GLuint TexelBytes;           /**< Bytes per texel, 0 if compressed format */

   StoreTexImageFunc StoreImage;

   /**
    * \name Texel fetch function pointers
    */
   /*@{*/
   FetchTexelFuncC FetchTexel1D;
   FetchTexelFuncC FetchTexel2D;
   FetchTexelFuncC FetchTexel3D;
   FetchTexelFuncF FetchTexel1Df;
   FetchTexelFuncF FetchTexel2Df;
   FetchTexelFuncF FetchTexel3Df;
   /*@}*/

   StoreTexelFunc StoreTexel;
};


/**
 * Texture image state.  Describes the dimensions of a texture image,
 * the texel format and pointers to Texel Fetch functions.
 */
struct gl_texture_image
{
   GLenum _BaseFormat;          /**< Either GL_RGB, GL_RGBA, GL_ALPHA,
                                 *   GL_LUMINANCE, GL_LUMINANCE_ALPHA,
                                 *   GL_INTENSITY, GL_COLOR_INDEX,
                                 *   GL_DEPTH_COMPONENT or GL_DEPTH_STENCIL_EXT
                                 *   only. Used for choosing TexEnv arithmetic.
                                 */
   GLint InternalFormat;        /**< 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 Depth;                /**< = 2^DepthLog2 + 2*Border */
   GLuint RowStride;            /**< == Width unless IsClientData and padded */
   GLuint ImageStride;          /**< Stride between images, in texels */
   GLuint Width2;               /**< = Width - 2*Border */
   GLuint Height2;              /**< = Height - 2*Border */
   GLuint Depth2;               /**< = Depth - 2*Border */
   GLuint WidthLog2;            /**< = log2(Width2) */
   GLuint HeightLog2;           /**< = log2(Height2) */
   GLuint DepthLog2;            /**< = log2(Depth2) */
   GLuint MaxLog2;              /**< = MAX(WidthLog2, HeightLog2) */
   GLfloat WidthScale;          /**< used for mipmap LOD computation */
   GLfloat HeightScale;         /**< used for mipmap LOD computation */
   GLfloat DepthScale;          /**< used for mipmap LOD computation */
   GLvoid *Data;                /**< Image data, accessed via FetchTexel() */
   GLboolean IsClientData;      /**< Data owned by client? */
   GLboolean _IsPowerOfTwo;     /**< Are all dimensions powers of two? */

   const struct gl_texture_format *TexFormat;

   struct gl_texture_object *TexObject;  /**< Pointer back to parent object */

   FetchTexelFuncC FetchTexelc; /**< GLchan texel fetch function pointer */
   FetchTexelFuncF FetchTexelf; /**< Float texel fetch function pointer */

   GLboolean IsCompressed;      /**< GL_ARB_texture_compression */
   GLuint CompressedSize;       /**< GL_ARB_texture_compression */

   /**
    * \name For device driver:
    */
   /*@{*/
   void *DriverData;            /**< Arbitrary device driver data */
   /*@}*/
};


/**
 * Indexes for cube map faces.
 */
/*@{*/
#define FACE_POS_X   0
#define FACE_NEG_X   1
#define FACE_POS_Y   2
#define FACE_NEG_Y   3
#define FACE_POS_Z   4
#define FACE_NEG_Z   5
#define MAX_FACES  6
/*@}*/


/**
 * Texture object state.  Contains the array of mipmap images, border color,
 * wrap modes, filter modes, shadow/texcompare state, and the per-texture
 * color palette.
 */
struct gl_texture_object
{
   _glthread_Mutex Mutex;       /**< for thread safety */
   GLint RefCount;              /**< reference count */
   GLuint Name;                 /**< the user-visible texture object ID */
   GLenum Target;               /**< GL_TEXTURE_1D, GL_TEXTURE_2D, etc. */
   GLfloat Priority;            /**< in [0,1] */
   GLfloat BorderColor[4];      /**< unclamped */
   GLchan _BorderChan[4];       /**< clamped, as GLchan */
   GLenum WrapS;                /**< S-axis texture image wrap mode */
   GLenum WrapT;                /**< T-axis texture image wrap mode */
   GLenum WrapR;                /**< R-axis texture image wrap mode */
   GLenum MinFilter;            /**< minification filter */
   GLenum MagFilter;            /**< magnification filter */
   GLfloat MinLod;              /**< min lambda, OpenGL 1.2 */
   GLfloat MaxLod;              /**< max lambda, OpenGL 1.2 */
   GLfloat LodBias;             /**< OpenGL 1.4 */
   GLint BaseLevel;             /**< min mipmap level, OpenGL 1.2 */
   GLint MaxLevel;              /**< max mipmap level, OpenGL 1.2 */
   GLfloat MaxAnisotropy;       /**< GL_EXT_texture_filter_anisotropic */
   GLboolean CompareFlag;       /**< GL_SGIX_shadow */
   GLenum CompareOperator;      /**< GL_SGIX_shadow */
   GLfloat ShadowAmbient;       /**< GL_ARB_shadow_ambient */
   GLenum CompareMode;          /**< GL_ARB_shadow */
   GLenum CompareFunc;          /**< GL_ARB_shadow */
   GLenum DepthMode;            /**< GL_ARB_depth_texture */
   GLint _MaxLevel;             /**< actual max mipmap level (q in the spec) */
   GLfloat _MaxLambda;          /**< = _MaxLevel - BaseLevel (q - b in spec) */
   GLboolean GenerateMipmap;    /**< GL_SGIS_generate_mipmap */
   GLboolean Complete;          /**< Is texture object complete? */

   /** Actual texture images, indexed by [cube face] and [mipmap level] */
   struct gl_texture_image *Image[MAX_FACES][MAX_TEXTURE_LEVELS];

   /** GL_EXT_paletted_texture */
   struct gl_color_table Palette;


   /**
    * \name For device driver.
    * Note: instead of attaching driver data to this pointer, it's preferable
    * to instead use this struct as a base class for your own texture object
    * class.  Driver->NewTextureObject() can be used to implement the
    * allocation.
    */
   void *DriverData;    /**< Arbitrary device driver data */
};


/**
 * Texture combine environment state.
 * 
 * \todo
 * If GL_NV_texture_env_combine4 is ever supported, the arrays in this
 * structure will need to be expanded for 4 elements.
 */
struct gl_tex_env_combine_state
{
   GLenum ModeRGB;       /**< GL_REPLACE, GL_DECAL, GL_ADD, etc. */
   GLenum ModeA;         /**< GL_REPLACE, GL_DECAL, GL_ADD, etc. */
   GLenum SourceRGB[3];  /**< GL_PRIMARY_COLOR, GL_TEXTURE, etc. */
   GLenum SourceA[3];    /**< GL_PRIMARY_COLOR, GL_TEXTURE, etc. */
   GLenum OperandRGB[3]; /**< SRC_COLOR, ONE_MINUS_SRC_COLOR, etc */
   GLenum OperandA[3];   /**< SRC_ALPHA, ONE_MINUS_SRC_ALPHA, etc */
   GLuint ScaleShiftRGB; /**< 0, 1 or 2 */
   GLuint ScaleShiftA;   /**< 0, 1 or 2 */
   GLuint _NumArgsRGB;   /**< Number of inputs used for the combine mode. */
   GLuint _NumArgsA;     /**< Number of inputs used for the combine mode. */
};


/**
 * Texture unit state.  Contains enable flags, texture environment/function/
 * combiners, texgen state, pointers to current texture objects and
 * post-filter color tables.
 */
struct gl_texture_unit
{
   GLbitfield Enabled;          /**< bitmask of TEXTURE_*_BIT flags */
   GLbitfield _ReallyEnabled;   /**< 0 or exactly one of TEXTURE_*_BIT flags */

   GLenum EnvMode;              /**< GL_MODULATE, GL_DECAL, GL_BLEND, etc. */
   GLfloat EnvColor[4];
   GLbitfield TexGenEnabled;    /**< Bitwise-OR of [STRQ]_BIT values */
   /** \name Tex coord generation mode
    * Either GL_OBJECT_LINEAR, GL_EYE_LINEAR or GL_SPHERE_MAP. */
   /*@{*/
   GLenum GenModeS;             
   GLenum GenModeT;
   GLenum GenModeR;
   GLenum GenModeQ;
   /*@}*/
   GLbitfield _GenBitS;
   GLbitfield _GenBitT;
   GLbitfield _GenBitR;
   GLbitfield _GenBitQ;
   GLbitfield _GenFlags;        /**< bitwise or of GenBit[STRQ] */
   GLfloat ObjectPlaneS[4];
   GLfloat ObjectPlaneT[4];
   GLfloat ObjectPlaneR[4];
   GLfloat ObjectPlaneQ[4];
   GLfloat EyePlaneS[4];
   GLfloat EyePlaneT[4];
   GLfloat EyePlaneR[4];
   GLfloat EyePlaneQ[4];
   GLfloat LodBias;             /**< for biasing mipmap levels */

   /** 
    * \name GL_EXT_texture_env_combine 
    */
   struct gl_tex_env_combine_state Combine;

   /**
    * Derived state based on \c EnvMode and the \c BaseFormat of the
    * currently enabled texture.
    */
   struct gl_tex_env_combine_state _EnvMode;

   /**
    * Currently enabled combiner state.  This will point to either
    * \c Combine or \c _EnvMode.
    */
   struct gl_tex_env_combine_state *_CurrentCombine;

   struct gl_texture_object *Current1D;
   struct gl_texture_object *Current2D;
   struct gl_texture_object *Current3D;
   struct gl_texture_object *CurrentCubeMap; /**< GL_ARB_texture_cube_map */
   struct gl_texture_object *CurrentRect;    /**< GL_NV_texture_rectangle */

   struct gl_texture_object *_Current; /**< Points to really enabled tex obj */

   struct gl_texture_object Saved1D;  /**< only used by glPush/PopAttrib */
   struct gl_texture_object Saved2D;
   struct gl_texture_object Saved3D;
   struct gl_texture_object SavedCubeMap;
   struct gl_texture_object SavedRect;

   /* GL_SGI_texture_color_table */
   struct gl_color_table ColorTable;
   struct gl_color_table ProxyColorTable;
   GLboolean ColorTableEnabled;
};

struct texenvprog_cache {
   GLuint hash;
   void *key;
   void *data;
   struct texenvprog_cache *next;
};

/**
 * Texture attribute group (GL_TEXTURE_BIT).
 */
struct gl_texture_attrib
{
   /**
    * name multitexture 
    */
   /**@{*/
   GLuint CurrentUnit;         /**< Active texture unit */
   GLbitfield _EnabledUnits;  /**< one bit set for each really-enabled unit */
   GLbitfield _EnabledCoordUnits;   /**< one bit per enabled coordinate unit */
   GLbitfield _GenFlags;            /**< for texgen */
   GLbitfield _TexGenEnabled;
   GLbitfield _TexMatEnabled;
   /**@}*/

   struct gl_texture_unit Unit[MAX_TEXTURE_UNITS];

   struct gl_texture_object *Proxy1D;
   struct gl_texture_object *Proxy2D;
   struct gl_texture_object *Proxy3D;
   struct gl_texture_object *ProxyCubeMap;
   struct gl_texture_object *ProxyRect;

   /** GL_EXT_shared_texture_palette */
   GLboolean SharedPalette;
   struct gl_color_table Palette;
   
   /** Cached texenv fragment programs */
   struct texenvprog_cache *env_fp_cache;
};


/**
 * Transformation attribute group (GL_TRANSFORM_BIT).
 */
struct gl_transform_attrib
{
   GLenum MatrixMode;                           /**< Matrix mode */
   GLfloat EyeUserPlane[MAX_CLIP_PLANES][4];    /**< User clip planes */
   GLfloat _ClipUserPlane[MAX_CLIP_PLANES][4];  /**< derived */
   GLbitfield ClipPlanesEnabled;                /**< on/off bitmask */
   GLboolean Normalize;                         /**< Normalize all normals? */
   GLboolean RescaleNormals;                    /**< GL_EXT_rescale_normal */
   GLboolean RasterPositionUnclipped;           /**< GL_IBM_rasterpos_clip */

   GLboolean CullVertexFlag;    /**< True if GL_CULL_VERTEX_EXT is enabled */
   GLfloat CullEyePos[4];
   GLfloat CullObjPos[4];
};


/**
 * Viewport attribute group (GL_VIEWPORT_BIT).
 */
struct gl_viewport_attrib
{
   GLint X, Y;                  /**< position */
   GLsizei Width, Height;       /**< size */
   GLfloat Near, Far;           /**< Depth buffer range */
   GLmatrix _WindowMap;         /**< Mapping transformation as a matrix. */
};


/**
 * Node for the attribute stack.
 */
struct gl_attrib_node
{
   GLbitfield kind;
   void *data;
   struct gl_attrib_node *next;
};


/**
 * GL_ARB_vertex/pixel_buffer_object buffer object
 */
struct gl_buffer_object
{
   GLint RefCount;
   GLuint Name;
   GLenum Usage;
   GLenum Access;
   GLvoid *Pointer;          /**< Only valid while buffer is mapped */
   GLsizeiptrARB Size;       /**< Size of storage in bytes */
   GLubyte *Data;            /**< Location of storage either in RAM or VRAM. */
   GLboolean OnCard;         /**< Is buffer in VRAM? (hardware drivers) */
};



/**
 * Client pixel packing/unpacking attributes
 */
struct gl_pixelstore_attrib
{
   GLint Alignment;
   GLint RowLength;
   GLint SkipPixels;
   GLint SkipRows;
   GLint ImageHeight;     /**< for GL_EXT_texture3D */
   GLint SkipImages;      /**< for GL_EXT_texture3D */
   GLboolean SwapBytes;
   GLboolean LsbFirst;
   GLboolean ClientStorage; /**< GL_APPLE_client_storage */
   GLboolean Invert;        /**< GL_MESA_pack_invert */
   struct gl_buffer_object *BufferObj; /**< GL_ARB_pixel_buffer_object */
};


#define CA_CLIENT_DATA     0x1  /**< Data not allocated by mesa */


/**
 * Client vertex array attributes
 */
struct gl_client_array
{
   GLint Size;                  /**< components per element (1,2,3,4) */
   GLenum Type;                 /**< datatype: GL_FLOAT, GL_INT, etc */
   GLsizei Stride;              /**< user-specified stride */
   GLsizei StrideB;             /**< actual stride in bytes */
   const GLubyte *Ptr;          /**< Points to array data */
   GLbitfield Enabled;          /**< one of the _NEW_ARRAY_ bits */
   GLboolean Normalized;        /**< GL_ARB_vertex_program */

   /**< GL_ARB_vertex_buffer_object */
   struct gl_buffer_object *BufferObj;
   GLuint _MaxElement;

   GLbitfield Flags;
};


/**
 * Vertex array state
 */
struct gl_array_attrib
{
   /** Conventional vertex arrays */
   /*@{*/
   struct gl_client_array Vertex;
   struct gl_client_array Normal;
   struct gl_client_array Color;
   struct gl_client_array SecondaryColor;
   struct gl_client_array FogCoord;
   struct gl_client_array Index;
   struct gl_client_array TexCoord[MAX_TEXTURE_COORD_UNITS];
   struct gl_client_array EdgeFlag;
   /*@}*/

   /** Generic arrays for vertex programs/shaders; */
   struct gl_client_array VertexAttrib[VERT_ATTRIB_MAX];

   GLint ActiveTexture;         /**< Client Active Texture */
   GLuint LockFirst;            /**< GL_EXT_compiled_vertex_array */
   GLuint LockCount;            /**< GL_EXT_compiled_vertex_array */

   GLbitfield _Enabled;         /**< mask of _NEW_ARRAY_* values */
   GLbitfield NewState;         /**< mask of _NEW_ARRAY_* values */

#if FEATURE_ARB_vertex_buffer_object
   struct gl_buffer_object *NullBufferObj;
   struct gl_buffer_object *ArrayBufferObj;
   struct gl_buffer_object *ElementArrayBufferObj;
#endif
   GLuint _MaxElement;          /* Min of all enabled array's maxes */
};


/**
 * Feedback buffer state
 */
struct gl_feedback
{
   GLenum Type;
   GLbitfield _Mask;            /* FB_* bits */
   GLfloat *Buffer;
   GLuint BufferSize;
   GLuint Count;
};


/**
 * Selection buffer state
 */
struct gl_selection
{
   GLuint *Buffer;      /**< selection buffer */
   GLuint BufferSize;   /**< size of the selection buffer */
   GLuint BufferCount;  /**< number of values in the selection buffer */
   GLuint Hits;         /**< number of records in the selection buffer */
   GLuint NameStackDepth; /**< name stack depth */
   GLuint NameStack[MAX_NAME_STACK_DEPTH]; /**< name stack */
   GLboolean HitFlag;   /**< hit flag */
   GLfloat HitMinZ;     /**< minimum hit depth */
   GLfloat HitMaxZ;     /**< maximum hit depth */
};


/**
 * 1-D Evaluator control points
 */
struct gl_1d_map
{
   GLuint Order;        /**< Number of control points */
   GLfloat u1, u2, du;  /**< u1, u2, 1.0/(u2-u1) */
   GLfloat *Points;     /**< Points to contiguous control points */
};


/**
 * 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, du;
   GLfloat v1, v2, dv;
   GLfloat *Points;             /**< Points to contiguous control points */
};


/**
 * All evaluator control point state
 */
struct gl_evaluators
{
   /** 
    * \name 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;
   struct gl_1d_map Map1Attrib[16];  /**< GL_NV_vertex_program */
   /*@}*/

   /** 
    * \name 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;
   struct gl_2d_map Map2Attrib[16];  /**< GL_NV_vertex_program */
   /*@}*/
};


/**
 * State used during execution of fragment programs.
 */
struct fp_machine
{
   GLfloat Temporaries[MAX_NV_FRAGMENT_PROGRAM_TEMPS][4];
   GLfloat Inputs[MAX_NV_FRAGMENT_PROGRAM_INPUTS][4];
   GLfloat Outputs[MAX_NV_FRAGMENT_PROGRAM_OUTPUTS][4];
   GLuint CondCodes[4];
};


/**
 * Names of the various vertex/fragment program register files, etc.
 * NOTE: first four tokens must fit into 2 bits (see t_vb_arbprogram.c)
 * All values should fit in a 4-bit field.
 */
enum register_file
{
   PROGRAM_TEMPORARY = 0,
   PROGRAM_LOCAL_PARAM = 1,
   PROGRAM_ENV_PARAM = 2,
   PROGRAM_STATE_VAR = 3,
   PROGRAM_INPUT = 4,
   PROGRAM_OUTPUT = 5,
   PROGRAM_NAMED_PARAM = 6,
   PROGRAM_CONSTANT = 7,
   PROGRAM_WRITE_ONLY = 8,
   PROGRAM_ADDRESS = 9,
   PROGRAM_UNDEFINED = 15  /* invalid value */
};


/** Vertex and fragment instructions */
struct prog_instruction;
struct program_parameter_list;


/**
 * Base class for any kind of program object
 */
struct program
{
   GLuint Id;
   GLubyte *String;          /**< Null-terminated program text */
   GLint RefCount;
   GLenum Target;
   GLenum Format;            /**< String encoding format */
   GLboolean Resident;

   struct prog_instruction *Instructions;

   GLbitfield InputsRead;     /* Bitmask of which input regs are read */
   GLbitfield OutputsWritten; /* Bitmask of which output regs are written to */

   /** Named parameters, constants, etc. from program text */
   struct program_parameter_list *Parameters;
   /** Numbered local parameters */
   GLfloat LocalParams[MAX_PROGRAM_LOCAL_PARAMS][4];

   /** Logical counts */
   /*@{*/
   GLuint NumInstructions;
   GLuint NumTemporaries;
   GLuint NumParameters;
   GLuint NumAttributes;
   GLuint NumAddressRegs;
   /*@}*/
   /** Native, actual h/w counts */
   /*@{*/
   GLuint NumNativeInstructions;
   GLuint NumNativeTemporaries;
   GLuint NumNativeParameters;
   GLuint NumNativeAttributes;
   GLuint NumNativeAddressRegs;
   /*@}*/
};


/** Vertex program object */
struct vertex_program
{
   struct program Base;   /* base class */
   GLboolean IsNVProgram; /* GL_NV_vertex_program ? */
   GLboolean IsPositionInvariant;  /* GL_ARB_vertex_program / GL_NV_vertex_program1_1 */
   void *TnlData;               /* should probably use Base.DriverData */
};


/** Fragment program object */
struct fragment_program
{
   struct program Base;   /**< base class */
   GLbitfield TexturesUsed[MAX_TEXTURE_IMAGE_UNITS];  /**< TEXTURE_x_BIT bitmask */
   GLuint NumAluInstructions; /**< GL_ARB_fragment_program */
   GLuint NumTexInstructions;
   GLuint NumTexIndirections;
   GLuint NumNativeAluInstructions; /**< GL_ARB_fragment_program */
   GLuint NumNativeTexInstructions;
   GLuint NumNativeTexIndirections;
   GLenum FogOption;
   GLboolean UsesKill;
};


/**
 * State common to vertex and fragment programs.
 */
struct gl_program_state
{
   GLint ErrorPos;                       /* GL_PROGRAM_ERROR_POSITION_ARB/NV */
   const char *ErrorString;              /* GL_PROGRAM_ERROR_STRING_ARB/NV */
};


/**
 * State vars for GL_ARB/GL_NV_vertex_program
 */
struct gl_vertex_program_state
{
   GLboolean Enabled;                  /**< GL_VERTEX_PROGRAM_ARB/NV */
   GLboolean _Enabled;                 /**< Enabled and valid program? */
   GLboolean PointSizeEnabled;         /**< GL_VERTEX_PROGRAM_POINT_SIZE_ARB/NV */
   GLboolean TwoSideEnabled;           /**< GL_VERTEX_PROGRAM_TWO_SIDE_ARB/NV */
   struct vertex_program *Current;     /**< ptr to currently bound program */
   struct vertex_program *_Current;    /**< ptr to currently bound
                                           program, including internal
                                           (t_vp_build.c) programs */

   GLenum TrackMatrix[MAX_NV_VERTEX_PROGRAM_PARAMS / 4];
   GLenum TrackMatrixTransform[MAX_NV_VERTEX_PROGRAM_PARAMS / 4];

   GLfloat Parameters[MAX_NV_VERTEX_PROGRAM_PARAMS][4]; /* Env params */
   /* Only used during program execution (may be moved someday): */
   GLfloat Temporaries[MAX_NV_VERTEX_PROGRAM_TEMPS][4];
   GLfloat Inputs[MAX_NV_VERTEX_PROGRAM_INPUTS][4];
   GLuint InputsSize[MAX_NV_VERTEX_PROGRAM_INPUTS];
   GLfloat Outputs[MAX_NV_VERTEX_PROGRAM_OUTPUTS][4];
   GLint AddressReg[4];

#if FEATURE_MESA_program_debug
   GLprogramcallbackMESA Callback;
   GLvoid *CallbackData;
   GLboolean CallbackEnabled;
   GLuint CurrentPosition;
#endif
};


/**
 * Context state for GL_ARB/NV_fragment_program
 */
struct gl_fragment_program_state
{
   GLboolean Enabled;                    /* GL_VERTEX_PROGRAM_NV */
   GLboolean _Enabled;                   /* Enabled and valid program? */
   GLboolean _Active;
   struct fragment_program *Current;     /* ptr to currently bound program */
   struct fragment_program *_Current;    /* ptr to currently active program 
                                            (including internal programs) */
   struct fp_machine Machine;            /* machine state */
   GLfloat Parameters[MAX_NV_FRAGMENT_PROGRAM_PARAMS][4]; /* Env params */

#if FEATURE_MESA_program_debug
   GLprogramcallbackMESA Callback;
   GLvoid *CallbackData;
   GLboolean CallbackEnabled;
   GLuint CurrentPosition;
#endif
};


/**
 * ATI_fragment_shader runtime state
 */
#define ATI_FS_INPUT_PRIMARY 0
#define ATI_FS_INPUT_SECONDARY 1

struct atifs_instruction;
struct atifs_setupinst;

/**
 * State for executing ATI fragment shader.
 */
struct atifs_machine
{
   GLfloat Registers[6][4];         /** six temporary registers */
   GLfloat PrevPassRegisters[6][4];
   GLfloat Inputs[2][4];   /** Primary, secondary input colors */
};


/**
 * ATI fragment shader
 */
struct ati_fragment_shader
{
   GLuint Id;
   GLint RefCount;
   struct atifs_instruction *Instructions[2];
   struct atifs_setupinst *SetupInst[2];
   GLfloat Constants[8][4];
   GLbitfield LocalConstDef;  /** Indicates which constants have been set */
   GLubyte numArithInstr[2];
   GLubyte regsAssigned[2];
   GLubyte NumPasses;         /** 1 or 2 */
   GLubyte cur_pass;
   GLubyte last_optype;
   GLboolean interpinp1;
   GLboolean isValid;
   GLuint swizzlerq;
};

/**
 * Context state for GL_ATI_fragment_shader
 */
struct gl_ati_fragment_shader_state
{
   GLboolean Enabled;
   GLboolean _Enabled;                      /** enabled and valid shader? */
   GLboolean Compiling;
   GLfloat GlobalConstants[8][4];
   struct atifs_machine Machine;            /* machine state */
   struct ati_fragment_shader *Current;
};


/**
 * Occlusion/timer query object.
 */
struct gl_query_object
{
   GLuint Id;
   GLuint64EXT Result; /* the counter */
   GLboolean Active;   /* inside Begin/EndQuery */
   GLboolean Ready;    /* result is ready */
};


/**
 * Context state for query objects.
 */
struct gl_query_state
{
   struct _mesa_HashTable *QueryObjects;
   struct gl_query_object *CurrentOcclusionObject; /* GL_ARB_occlusion_query */
   struct gl_query_object *CurrentTimerObject;     /* GL_EXT_timer_query */
};


/**
 * Context state for vertex/fragment shaders.
 */
struct gl_shader_objects_state
{
   struct gl2_program_intf **CurrentProgram;
   GLboolean _VertexShaderPresent;
   GLboolean _FragmentShaderPresent;
};


/**
 * State which can be shared by multiple contexts:
 */
struct gl_shared_state
{
   _glthread_Mutex Mutex;                  /**< for thread safety */
   GLint RefCount;                         /**< Reference count */
   struct _mesa_HashTable *DisplayList;    /**< Display lists hash table */
   struct _mesa_HashTable *TexObjects;     /**< Texture objects hash table */

   /**
    * \name Default texture objects (shared by all multi-texture units)
    */
   /*@{*/
   struct gl_texture_object *Default1D;
   struct gl_texture_object *Default2D;
   struct gl_texture_object *Default3D;
   struct gl_texture_object *DefaultCubeMap;
   struct gl_texture_object *DefaultRect;
   /*@}*/

   /**
    * \name Vertex/fragment programs
    */
   /*@{*/
   struct _mesa_HashTable *Programs; /**< All vertex/fragment programs */
#if FEATURE_ARB_vertex_program
   struct program *DefaultVertexProgram;
#endif
#if FEATURE_ARB_fragment_program
   struct program *DefaultFragmentProgram;
#endif
   /*@}*/

#if FEATURE_ATI_fragment_shader
   struct _mesa_HashTable *ATIShaders;
   struct ati_fragment_shader *DefaultFragmentShader;
#endif

#if FEATURE_ARB_vertex_buffer_object || FEATURE_ARB_pixel_buffer_object
   struct _mesa_HashTable *BufferObjects;
#endif

   struct _mesa_HashTable *GL2Objects;

#if FEATURE_EXT_framebuffer_object
   struct _mesa_HashTable *RenderBuffers;
   struct _mesa_HashTable *FrameBuffers;
#endif

   void *DriverData;  /**< Device driver shared state */
};




/**
 * A renderbuffer stores colors or depth values or stencil values.
 * A framebuffer object will have a collection of these.
 * Data are read/written to the buffer with a handful of Get/Put functions.
 *
 * Instances of this object are allocated with the Driver's NewRenderbuffer
 * hook.  Drivers will likely wrap this class inside a driver-specific
 * class to simulate inheritance.
 */
struct gl_renderbuffer
{
   _glthread_Mutex Mutex;                  /**< for thread safety */
   GLuint ClassID;        /**< Useful for drivers */
   GLuint Name;
   GLint RefCount;
   GLuint Width, Height;
   GLenum InternalFormat; /**< The user-specified format */
   GLenum _ActualFormat;  /**< The driver-chosen format */
   GLenum _BaseFormat;    /**< Either GL_RGB, GL_RGBA, GL_DEPTH_COMPONENT or
                               GL_STENCIL_INDEX. */
   GLenum DataType;      /**< Type of values passed to the Get/Put functions */
   GLubyte RedBits;      /**< Bits of red per pixel */
   GLubyte GreenBits;
   GLubyte BlueBits;
   GLubyte AlphaBits;
   GLubyte IndexBits;
   GLubyte DepthBits;
   GLubyte StencilBits;
   GLvoid *Data;

   /* Used to wrap one renderbuffer around another: */
   struct gl_renderbuffer *Wrapped;

   /* Delete this renderbuffer */
   void (*Delete)(struct gl_renderbuffer *rb);

   /* Allocate new storage for this renderbuffer */
   GLboolean (*AllocStorage)(GLcontext *ctx, struct gl_renderbuffer *rb,
                             GLenum internalFormat,
                             GLuint width, GLuint height);

   /* Lock/Unlock are called before/after calling the Get/Put functions.
    * Not sure this is the right place for these yet.
   void (*Lock)(GLcontext *ctx, struct gl_renderbuffer *rb);
   void (*Unlock)(GLcontext *ctx, struct gl_renderbuffer *rb);
    */

   /* Return a pointer to the element/pixel at (x,y).
    * Should return NULL if the buffer memory can't be directly addressed.
    */
   void *(*GetPointer)(GLcontext *ctx, struct gl_renderbuffer *rb,
                       GLint x, GLint y);

   /* Get/Read a row of values.
    * The values will be of format _BaseFormat and type DataType.
    */
   void (*GetRow)(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                  GLint x, GLint y, void *values);

   /* Get/Read values at arbitrary locations.
    * The values will be of format _BaseFormat and type DataType.
    */
   void (*GetValues)(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                     const GLint x[], const GLint y[], void *values);

   /* Put/Write a row of values.
    * The values will be of format _BaseFormat and type DataType.
    */
   void (*PutRow)(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                  GLint x, GLint y, const void *values, const GLubyte *mask);

   /* Put/Write a row of RGB values.  This is a special-case routine that's
    * only used for RGBA renderbuffers when the source data is GL_RGB. That's
    * a common case for glDrawPixels and some triangle routines.
    * The values will be of format GL_RGB and type DataType.
    */
   void (*PutRowRGB)(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                    GLint x, GLint y, const void *values, const GLubyte *mask);


   /* Put/Write a row of identical values.
    * The values will be of format _BaseFormat and type DataType.
    */
   void (*PutMonoRow)(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                     GLint x, GLint y, const void *value, const GLubyte *mask);

   /* Put/Write values at arbitrary locations.
    * The values will be of format _BaseFormat and type DataType.
    */
   void (*PutValues)(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                     const GLint x[], const GLint y[], const void *values,
                     const GLubyte *mask);
   /* Put/Write identical values at arbitrary locations.
    * The values will be of format _BaseFormat and type DataType.
    */
   void (*PutMonoValues)(GLcontext *ctx, struct gl_renderbuffer *rb,
                         GLuint count, const GLint x[], const GLint y[],
                         const void *value, const GLubyte *mask);
};


/**
 * A renderbuffer attachment point points to either a texture object
 * (and specifies a mipmap level, cube face or 3D texture slice) or
 * points to a renderbuffer.
 */
struct gl_renderbuffer_attachment
{
   GLenum Type;  /* GL_NONE or GL_TEXTURE or GL_RENDERBUFFER_EXT */
   GLboolean Complete;

   /* IF Type == GL_RENDERBUFFER_EXT: */
   struct gl_renderbuffer *Renderbuffer;

   /* IF Type == GL_TEXTURE: */
   struct gl_texture_object *Texture;
   GLuint TextureLevel;
   GLuint CubeMapFace;  /* 0 .. 5, for cube map textures */
   GLuint Zoffset;      /* for 3D textures */
};


/**
 * A framebuffer is a collection of renderbuffers (color, depth, stencil, etc).
 * In C++ terms, think of this as a base class from which device drivers
 * will make derived classes.
 */
struct gl_framebuffer
{
   _glthread_Mutex Mutex;                  /**< for thread safety */
   GLuint Name;      /* if zero, this is a window system framebuffer */
   GLint RefCount;

   GLvisual Visual;     /**< The framebuffer's visual.
                             Immutable if this is a window system buffer.
                             Computed from attachments if user-made FBO. */

   GLboolean Initialized;

   GLuint Width, Height;        /**< size of frame buffer in pixels */

   /** \name  Drawing bounds (Intersection of buffer size and scissor box) */
   /*@{*/
   GLint _Xmin, _Xmax;  /**< inclusive */
   GLint _Ymin, _Ymax;  /**< exclusive */
   /*@}*/

   /** \name  Derived Z buffer stuff */
   /*@{*/
   GLuint _DepthMax;    /**< Max depth buffer value */
   GLfloat _DepthMaxF;  /**< Float max depth buffer value */
   GLfloat _MRD;        /**< minimum resolvable difference in Z values */
   /*@}*/

   GLenum _Status; /* One of the GL_FRAMEBUFFER_(IN)COMPLETE_* tokens */

   /* Array of all renderbuffer attachments, indexed by BUFFER_* tokens. */
   struct gl_renderbuffer_attachment Attachment[BUFFER_COUNT];

   /* In unextended OpenGL these vars are part of the GL_COLOR_BUFFER
    * attribute group and GL_PIXEL attribute group, respectively.
    */
   GLenum ColorDrawBuffer[MAX_DRAW_BUFFERS];
   GLenum ColorReadBuffer;

   /* These are computed from ColorDrawBuffer and ColorReadBuffer */
   GLbitfield _ColorDrawBufferMask[MAX_DRAW_BUFFERS]; /* Mask of BUFFER_BIT_* flags */
   GLint _ColorReadBufferIndex; /* -1 = None */

   /* These are computed from _ColorDrawBufferMask and _ColorReadBufferIndex */
   GLuint _NumColorDrawBuffers[MAX_DRAW_BUFFERS];
   struct gl_renderbuffer *_ColorDrawBuffers[MAX_DRAW_BUFFERS][4];
   struct gl_renderbuffer *_ColorReadBuffer;

   /** The Actual depth/stencil buffers to use.  May be wrappers around the
    * depth/stencil buffers attached above. */
   struct gl_renderbuffer *_DepthBuffer;
   struct gl_renderbuffer *_StencilBuffer;

   /** Delete this framebuffer */
   void (*Delete)(struct gl_framebuffer *fb);
};


/**
 * Limits for vertex and fragment programs.
 */
struct gl_program_constants
{
   /* logical limits */
   GLuint MaxInstructions;
   GLuint MaxAluInstructions; /* fragment programs only, for now */
   GLuint MaxTexInstructions; /* fragment programs only, for now */
   GLuint MaxTexIndirections; /* fragment programs only, for now */
   GLuint MaxAttribs;
   GLuint MaxTemps;
   GLuint MaxAddressRegs; /* vertex program only, for now */
   GLuint MaxParameters;
   GLuint MaxLocalParams;
   GLuint MaxEnvParams;
   /* native/hardware limits */
   GLuint MaxNativeInstructions;
   GLuint MaxNativeAluInstructions; /* fragment programs only, for now */
   GLuint MaxNativeTexInstructions; /* fragment programs only, for now */
   GLuint MaxNativeTexIndirections; /* fragment programs only, for now */
   GLuint MaxNativeAttribs;
   GLuint MaxNativeTemps;
   GLuint MaxNativeAddressRegs; /* vertex program only, for now */
   GLuint MaxNativeParameters;
};


/**
 * Constants which may be overridden by device driver during context creation
 * but are never changed after that.
 */
struct gl_constants
{
   GLint MaxTextureLevels;              /**< Maximum number of allowed mipmap levels. */ 
   GLint Max3DTextureLevels;            /**< Maximum number of allowed mipmap levels for 3D texture targets. */
   GLint MaxCubeTextureLevels;          /**< Maximum number of allowed mipmap levels for GL_ARB_texture_cube_map */
   GLint MaxTextureRectSize;            /* GL_NV_texture_rectangle */
   GLuint MaxTextureCoordUnits;
   GLuint MaxTextureImageUnits;
   GLuint MaxTextureUnits;              /* = MIN(CoordUnits, ImageUnits) */
   GLfloat MaxTextureMaxAnisotropy;     /* GL_EXT_texture_filter_anisotropic */
   GLfloat MaxTextureLodBias;           /* GL_EXT_texture_lod_bias */
   GLuint MaxArrayLockSize;
   GLint SubPixelBits;
   GLfloat MinPointSize, MaxPointSize;          /* aliased */
   GLfloat MinPointSizeAA, MaxPointSizeAA;      /* antialiased */
   GLfloat PointSizeGranularity;
   GLfloat MinLineWidth, MaxLineWidth;          /* aliased */
   GLfloat MinLineWidthAA, MaxLineWidthAA;      /* antialiased */
   GLfloat LineWidthGranularity;
   GLuint MaxColorTableSize;
   GLuint MaxConvolutionWidth;
   GLuint MaxConvolutionHeight;
   GLuint MaxClipPlanes;
   GLuint MaxLights;
   GLfloat MaxShininess;                        /* GL_NV_light_max_exponent */
   GLfloat MaxSpotExponent;                     /* GL_NV_light_max_exponent */
   GLuint MaxViewportWidth, MaxViewportHeight;
   struct gl_program_constants VertexProgram;    /* GL_ARB_vertex_program */
   struct gl_program_constants FragmentProgram;  /* GL_ARB_fragment_program */
   /* shared by vertex and fragment program: */
   GLuint MaxProgramMatrices;
   GLuint MaxProgramMatrixStackDepth;
   /* vertex array / buffer object bounds checking */
   GLboolean CheckArrayBounds;
   /* GL_ARB_draw_buffers */
   GLuint MaxDrawBuffers;
   /* GL_OES_read_format */
   GLenum ColorReadFormat;
   GLenum ColorReadType;
   /* GL_EXT_framebuffer_object */
   GLuint MaxColorAttachments;
   GLuint MaxRenderbufferSize;
};


/**
 * Enable flag for each OpenGL extension.  Different device drivers will
 * enable different extensions at runtime.
 */
struct gl_extensions
{
   /**
    * \name Flags to quickly test if certain extensions are available.
    * 
    * Not every extension needs to have such a flag, but it's encouraged.
    */
   /*@{*/
   GLboolean dummy;  /* don't remove this! */
   GLboolean ARB_depth_texture;
   GLboolean ARB_draw_buffers;
   GLboolean ARB_fragment_program;
   GLboolean ARB_fragment_shader;
   GLboolean ARB_half_float_pixel;
   GLboolean ARB_imaging;
   GLboolean ARB_multisample;
   GLboolean ARB_multitexture;
   GLboolean ARB_occlusion_query;
   GLboolean ARB_point_sprite;
   GLboolean ARB_shader_objects;
   GLboolean ARB_shading_language_100;
   GLboolean ARB_shadow;
   GLboolean ARB_texture_border_clamp;
   GLboolean ARB_texture_compression;
   GLboolean ARB_texture_cube_map;
   GLboolean ARB_texture_env_combine;
   GLboolean ARB_texture_env_crossbar;
   GLboolean ARB_texture_env_dot3;
   GLboolean ARB_texture_float;
   GLboolean ARB_texture_mirrored_repeat;
   GLboolean ARB_texture_non_power_of_two;
   GLboolean ARB_transpose_matrix;
   GLboolean ARB_vertex_buffer_object;
   GLboolean ARB_vertex_program;
   GLboolean ARB_vertex_shader;
   GLboolean ARB_window_pos;
   GLboolean EXT_abgr;
   GLboolean EXT_bgra;
   GLboolean EXT_blend_color;
   GLboolean EXT_blend_equation_separate;
   GLboolean EXT_blend_func_separate;
   GLboolean EXT_blend_logic_op;
   GLboolean EXT_blend_minmax;
   GLboolean EXT_blend_subtract;
   GLboolean EXT_clip_volume_hint;
   GLboolean EXT_cull_vertex;
   GLboolean EXT_convolution;
   GLboolean EXT_compiled_vertex_array;
   GLboolean EXT_copy_texture;
   GLboolean EXT_depth_bounds_test;
   GLboolean EXT_draw_range_elements;
   GLboolean EXT_framebuffer_object;
   GLboolean EXT_fog_coord;
   GLboolean EXT_framebuffer_blit;
   GLboolean EXT_histogram;
   GLboolean EXT_multi_draw_arrays;
   GLboolean EXT_paletted_texture;
   GLboolean EXT_packed_depth_stencil;
   GLboolean EXT_packed_pixels;
   GLboolean EXT_pixel_buffer_object;
   GLboolean EXT_point_parameters;
   GLboolean EXT_polygon_offset;
   GLboolean EXT_rescale_normal;
   GLboolean EXT_shadow_funcs;
   GLboolean EXT_secondary_color;
   GLboolean EXT_separate_specular_color;
   GLboolean EXT_shared_texture_palette;
   GLboolean EXT_stencil_wrap;
   GLboolean EXT_stencil_two_side;
   GLboolean EXT_subtexture;
   GLboolean EXT_texture;
   GLboolean EXT_texture_object;
   GLboolean EXT_texture3D;
   GLboolean EXT_texture_compression_s3tc;
   GLboolean EXT_texture_env_add;
   GLboolean EXT_texture_env_combine;
   GLboolean EXT_texture_env_dot3;
   GLboolean EXT_texture_filter_anisotropic;
   GLboolean EXT_texture_lod_bias;
   GLboolean EXT_texture_mirror_clamp;
   GLboolean EXT_timer_query;
   GLboolean EXT_vertex_array;
   GLboolean EXT_vertex_array_set;
   /* vendor extensions */
   GLboolean APPLE_client_storage;
   GLboolean APPLE_packed_pixels;
   GLboolean ATI_texture_mirror_once;
   GLboolean ATI_texture_env_combine3;
   GLboolean ATI_fragment_shader;
   GLboolean IBM_rasterpos_clip;
   GLboolean IBM_multimode_draw_arrays;
   GLboolean MESA_pack_invert;
   GLboolean MESA_packed_depth_stencil;
   GLboolean MESA_program_debug;
   GLboolean MESA_resize_buffers;
   GLboolean MESA_ycbcr_texture;
   GLboolean NV_blend_square;
   GLboolean NV_fragment_program;
   GLboolean NV_light_max_exponent;
   GLboolean NV_point_sprite;
   GLboolean NV_texgen_reflection;
   GLboolean NV_texture_rectangle;
   GLboolean NV_vertex_program;
   GLboolean NV_vertex_program1_1;
   GLboolean OES_read_format;
   GLboolean SGI_color_matrix;
   GLboolean SGI_color_table;
   GLboolean SGI_texture_color_table;
   GLboolean SGIS_generate_mipmap;
   GLboolean SGIS_texture_edge_clamp;
   GLboolean SGIS_texture_lod;
   GLboolean SGIX_depth_texture;
   GLboolean SGIX_shadow;
   GLboolean SGIX_shadow_ambient; /* or GL_ARB_shadow_ambient */
   GLboolean TDFX_texture_compression_FXT1;
   GLboolean S3_s3tc;
   /*@}*/
   /* The extension string */
   const GLubyte *String;
};


/**
 * A stack of matrices (projection, modelview, color, texture, etc).
 */
struct matrix_stack
{
   GLmatrix *Top;      /**< points into Stack */
   GLmatrix *Stack;    /**< array [MaxDepth] of GLmatrix */
   GLuint Depth;       /**< 0 <= Depth < MaxDepth */
   GLuint MaxDepth;    /**< size of Stack[] array */
   GLuint DirtyFlag;   /**< _NEW_MODELVIEW or _NEW_PROJECTION, for example */
};


/**
 * \name Bits for image transfer operations 
 *
 * \sa __GLcontextRec::ImageTransferState.
 */
/*@{*/
#define IMAGE_SCALE_BIAS_BIT                      0x1
#define IMAGE_SHIFT_OFFSET_BIT                    0x2
#define IMAGE_MAP_COLOR_BIT                       0x4
#define IMAGE_COLOR_TABLE_BIT                     0x8
#define IMAGE_CONVOLUTION_BIT                     0x10
#define IMAGE_POST_CONVOLUTION_SCALE_BIAS         0x20
#define IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT    0x40
#define IMAGE_COLOR_MATRIX_BIT                    0x80
#define IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT   0x100
#define IMAGE_HISTOGRAM_BIT                       0x200
#define IMAGE_MIN_MAX_BIT                         0x400
#define IMAGE_CLAMP_BIT                           0x800 /* extra */


/** Pixel Transfer ops up to convolution */
#define IMAGE_PRE_CONVOLUTION_BITS (IMAGE_SCALE_BIAS_BIT |     \
                                    IMAGE_SHIFT_OFFSET_BIT |   \
                                    IMAGE_MAP_COLOR_BIT |      \
                                    IMAGE_COLOR_TABLE_BIT)

/** Pixel transfer ops after convolution */
#define IMAGE_POST_CONVOLUTION_BITS (IMAGE_POST_CONVOLUTION_SCALE_BIAS |      \
                                     IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT | \
                                     IMAGE_COLOR_MATRIX_BIT |                 \
                                     IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT |\
                                     IMAGE_HISTOGRAM_BIT |                    \
                                     IMAGE_MIN_MAX_BIT)
/*@}*/


/**
 * \name Bits to indicate what state has changed.  
 *
 * 4 unused flags.
 */
/*@{*/
#define _NEW_MODELVIEW          0x1        /**< __GLcontextRec::ModelView */
#define _NEW_PROJECTION         0x2        /**< __GLcontextRec::Projection */
#define _NEW_TEXTURE_MATRIX     0x4        /**< __GLcontextRec::TextureMatrix */
#define _NEW_COLOR_MATRIX       0x8        /**< __GLcontextRec::ColorMatrix */
#define _NEW_ACCUM              0x10       /**< __GLcontextRec::Accum */
#define _NEW_COLOR              0x20       /**< __GLcontextRec::Color */
#define _NEW_DEPTH              0x40       /**< __GLcontextRec::Depth */
#define _NEW_EVAL               0x80       /**< __GLcontextRec::Eval, __GLcontextRec::EvalMap */
#define _NEW_FOG                0x100      /**< __GLcontextRec::Fog */
#define _NEW_HINT               0x200      /**< __GLcontextRec::Hint */
#define _NEW_LIGHT              0x400      /**< __GLcontextRec::Light */
#define _NEW_LINE               0x800      /**< __GLcontextRec::Line */
#define _NEW_PIXEL              0x1000     /**< __GLcontextRec::Pixel */
#define _NEW_POINT              0x2000     /**< __GLcontextRec::Point */
#define _NEW_POLYGON            0x4000     /**< __GLcontextRec::Polygon */
#define _NEW_POLYGONSTIPPLE     0x8000     /**< __GLcontextRec::PolygonStipple */
#define _NEW_SCISSOR            0x10000    /**< __GLcontextRec::Scissor */
#define _NEW_STENCIL            0x20000    /**< __GLcontextRec::Stencil */
#define _NEW_TEXTURE            0x40000    /**< __GLcontextRec::Texture */
#define _NEW_TRANSFORM          0x80000    /**< __GLcontextRec::Transform */
#define _NEW_VIEWPORT           0x100000   /**< __GLcontextRec::Viewport */
#define _NEW_PACKUNPACK         0x200000   /**< __GLcontextRec::Pack, __GLcontextRec::Unpack */
#define _NEW_ARRAY              0x400000   /**< __GLcontextRec::Array */
#define _NEW_RENDERMODE         0x800000   /**< __GLcontextRec::RenderMode, __GLcontextRec::Feedback, __GLcontextRec::Select */
#define _NEW_BUFFERS            0x1000000  /**< __GLcontextRec::Visual, __GLcontextRec::DrawBuffer, */
#define _NEW_MULTISAMPLE        0x2000000  /**< __GLcontextRec::Multisample */
#define _NEW_TRACK_MATRIX       0x4000000  /**< __GLcontextRec::VertexProgram */
#define _NEW_PROGRAM            0x8000000  /**< __GLcontextRec::VertexProgram */
#define _NEW_ALL ~0
/*@}*/


/**
 * \name Bits to track array state changes 
 *
 * Also used to summarize array enabled.
 */
/*@{*/
#define _NEW_ARRAY_VERTEX           VERT_BIT_POS
#define _NEW_ARRAY_WEIGHT           VERT_BIT_WEIGHT
#define _NEW_ARRAY_NORMAL           VERT_BIT_NORMAL
#define _NEW_ARRAY_COLOR0           VERT_BIT_COLOR0
#define _NEW_ARRAY_COLOR1           VERT_BIT_COLOR1
#define _NEW_ARRAY_FOGCOORD         VERT_BIT_FOG
#define _NEW_ARRAY_INDEX            VERT_BIT_COLOR_INDEX
#define _NEW_ARRAY_EDGEFLAG         VERT_BIT_SEVEN
#define _NEW_ARRAY_TEXCOORD_0       VERT_BIT_TEX0
#define _NEW_ARRAY_TEXCOORD_1       VERT_BIT_TEX1
#define _NEW_ARRAY_TEXCOORD_2       VERT_BIT_TEX2
#define _NEW_ARRAY_TEXCOORD_3       VERT_BIT_TEX3
#define _NEW_ARRAY_TEXCOORD_4       VERT_BIT_TEX4
#define _NEW_ARRAY_TEXCOORD_5       VERT_BIT_TEX5
#define _NEW_ARRAY_TEXCOORD_6       VERT_BIT_TEX6
#define _NEW_ARRAY_TEXCOORD_7       VERT_BIT_TEX7
#define _NEW_ARRAY_ATTRIB_0         0x10000  /* start at bit 16 */
#define _NEW_ARRAY_ALL              0xffffffff


#define _NEW_ARRAY_TEXCOORD(i) (_NEW_ARRAY_TEXCOORD_0 << (i))
#define _NEW_ARRAY_ATTRIB(i) (_NEW_ARRAY_ATTRIB_0 << (i))
/*@}*/


/**
 * \name A bunch of flags that we think might be useful to drivers.
 * 
 * Set in the __GLcontextRec::_TriangleCaps bitfield.
 */
/*@{*/
#define DD_FLATSHADE                0x1
#define DD_SEPARATE_SPECULAR        0x2
#define DD_TRI_CULL_FRONT_BACK      0x4 /* special case on some hw */
#define DD_TRI_LIGHT_TWOSIDE        0x8
#define DD_TRI_UNFILLED             0x10
#define DD_TRI_SMOOTH               0x20
#define DD_TRI_STIPPLE              0x40
#define DD_TRI_OFFSET               0x80
#define DD_LINE_SMOOTH              0x100
#define DD_LINE_STIPPLE             0x200
#define DD_LINE_WIDTH               0x400
#define DD_POINT_SMOOTH             0x800
#define DD_POINT_SIZE               0x1000
#define DD_POINT_ATTEN              0x2000
#define DD_TRI_TWOSTENCIL           0x4000
/*@}*/


/**
 * \name Define the state changes under which each of these bits might change
 */
/*@{*/
#define _DD_NEW_FLATSHADE                _NEW_LIGHT
#define _DD_NEW_SEPARATE_SPECULAR        (_NEW_LIGHT | _NEW_FOG | _NEW_PROGRAM)
#define _DD_NEW_TRI_CULL_FRONT_BACK      _NEW_POLYGON
#define _DD_NEW_TRI_LIGHT_TWOSIDE        _NEW_LIGHT
#define _DD_NEW_TRI_UNFILLED             _NEW_POLYGON
#define _DD_NEW_TRI_SMOOTH               _NEW_POLYGON
#define _DD_NEW_TRI_STIPPLE              _NEW_POLYGON
#define _DD_NEW_TRI_OFFSET               _NEW_POLYGON
#define _DD_NEW_LINE_SMOOTH              _NEW_LINE
#define _DD_NEW_LINE_STIPPLE             _NEW_LINE
#define _DD_NEW_LINE_WIDTH               _NEW_LINE
#define _DD_NEW_POINT_SMOOTH             _NEW_POINT
#define _DD_NEW_POINT_SIZE               _NEW_POINT
#define _DD_NEW_POINT_ATTEN              _NEW_POINT
/*@}*/


#define _MESA_NEW_NEED_EYE_COORDS         (_NEW_LIGHT |         \
                                           _NEW_TEXTURE |       \
                                           _NEW_POINT |         \
                                           _NEW_MODELVIEW)

#define _MESA_NEW_NEED_NORMALS            (_NEW_LIGHT |         \
                                           _NEW_TEXTURE)

#define _IMAGE_NEW_TRANSFER_STATE         (_NEW_PIXEL | _NEW_COLOR_MATRIX)




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


/* This has to be included here. */
#include "dd.h"


#define NUM_VERTEX_FORMAT_ENTRIES (sizeof(GLvertexformat) / sizeof(void *))

/**
 * Core Mesa's support for tnl modules:
 */
struct gl_tnl_module
{
   /**
    * Vertex format to be lazily swapped into current dispatch.
    */
   const GLvertexformat *Current;

   /**
    * \name Record of functions swapped out.  
    * On restore, only need to swap these functions back in.
    */
   /*@{*/
   struct {
       _glapi_proc * location;
       _glapi_proc function;
   } Swapped[NUM_VERTEX_FORMAT_ENTRIES];
   GLuint SwapCount;
   /*@}*/
};

/* Strictly this is a tnl/ private concept, but it doesn't seem
 * worthwhile adding a tnl private structure just to hold this one bit
 * of information:
 */
#define MESA_DLIST_DANGLING_REFS     0x1 

/* Provide a location where information about a display list can be
 * collected.  Could be extended with driverPrivate structures,
 * etc. in the future.
 */
struct mesa_display_list
{
   Node *node;
   GLuint id;
   GLbitfield flags;
};


/**
 * State used during display list compilation and execution.
 */
struct mesa_list_state
{
   struct mesa_display_list *CallStack[MAX_LIST_NESTING];
   GLuint CallDepth;            /**< Current recursion calling depth */

   struct mesa_display_list *CurrentList;
   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 */

   GLvertexformat ListVtxfmt;

   GLubyte ActiveAttribSize[VERT_ATTRIB_MAX];
   GLfloat CurrentAttrib[VERT_ATTRIB_MAX][4];
   
   GLubyte ActiveMaterialSize[MAT_ATTRIB_MAX];
   GLfloat CurrentMaterial[MAT_ATTRIB_MAX][4];

   GLubyte ActiveIndex;
   GLfloat CurrentIndex;
   
   GLubyte ActiveEdgeFlag;
   GLboolean CurrentEdgeFlag;
};


/**
 * Mesa rendering context.
 *
 * This is the central context data structure for Mesa.  Almost all
 * OpenGL state is contained in this structure.
 * Think of this as a base class from which device drivers will derive
 * sub classes.
 *
 * The GLcontext typedef names this structure.
 */
struct __GLcontextRec
{
   /**
    * \name OS related interfaces. 
    *
    * These \b must be the first members of this structure, because they are
    * exposed to the outside world (i.e. GLX extension).
    */
   /*@{*/
   __GLimports imports;
   __GLexports exports;
   /*@}*/

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

   /** \name API function pointer tables */
   /*@{*/
   struct _glapi_table *Save;   /**< Display list save functions */
   struct _glapi_table *Exec;   /**< Execute functions */
   struct _glapi_table *CurrentDispatch;  /**< == Save or Exec !! */
   /*@}*/

   GLvisual Visual;
   GLframebuffer *DrawBuffer;   /**< buffer for writing */
   GLframebuffer *ReadBuffer;   /**< buffer for reading */
   GLframebuffer *WinSysDrawBuffer;  /**< set with MakeCurrent */
   GLframebuffer *WinSysReadBuffer;  /**< set with MakeCurrent */

   /**
    * Device 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)*/

   /** Core/Driver constants */
   struct gl_constants Const;

   /** \name The various 4x4 matrix stacks */
   /*@{*/
   struct matrix_stack ModelviewMatrixStack;
   struct matrix_stack ProjectionMatrixStack;
   struct matrix_stack ColorMatrixStack;
   struct matrix_stack TextureMatrixStack[MAX_TEXTURE_COORD_UNITS];
   struct matrix_stack ProgramMatrixStack[MAX_PROGRAM_MATRICES];
   struct matrix_stack *CurrentStack; /**< Points to one of the above stacks */
   /*@}*/

   /** Combined modelview and projection matrix */
   GLmatrix _ModelProjectMatrix;

   /** \name Display lists */
   struct mesa_list_state ListState;

   GLboolean ExecuteFlag;       /**< Execute GL commands? */
   GLboolean CompileFlag;       /**< Compile GL commands into display list? */

   /** Extension information */
   struct gl_extensions Extensions;

   /** \name State attribute stack (for glPush/PopAttrib) */
   /*@{*/
   GLuint AttribStackDepth;
   struct gl_attrib_node *AttribStack[MAX_ATTRIB_STACK_DEPTH];
   /*@}*/

   /** \name Renderer attribute groups
    * 
    * 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       Accum;          /**< Accum buffer attributes */
   struct gl_colorbuffer_attrib Color;          /**< Color buffer attributes */
   struct gl_current_attrib     Current;        /**< Current attributes */
   struct gl_depthbuffer_attrib Depth;          /**< Depth buffer attributes */
   struct gl_eval_attrib        Eval;           /**< Eval attributes */
   struct gl_fog_attrib         Fog;            /**< Fog attributes */
   struct gl_hint_attrib        Hint;           /**< Hint attributes */
   struct gl_light_attrib       Light;          /**< Light attributes */
   struct gl_line_attrib        Line;           /**< Line attributes */
   struct gl_list_attrib        List;           /**< List attributes */
   struct gl_multisample_attrib Multisample;
   struct gl_pixel_attrib       Pixel;          /**< Pixel attributes */
   struct gl_point_attrib       Point;          /**< Point attributes */
   struct gl_polygon_attrib     Polygon;        /**< Polygon attributes */
   GLuint PolygonStipple[32];                   /**< Polygon stipple */
   struct gl_scissor_attrib     Scissor;        /**< Scissor attributes */
   struct gl_stencil_attrib     Stencil;        /**< Stencil buffer attributes */
   struct gl_texture_attrib     Texture;        /**< Texture attributes */
   struct gl_transform_attrib   Transform;      /**< Transformation attributes */
   struct gl_viewport_attrib    Viewport;       /**< Viewport attributes */
   /*@}*/

   /** \name Client attribute stack */
   /*@{*/
   GLuint ClientAttribStackDepth;
   struct gl_attrib_node *ClientAttribStack[MAX_CLIENT_ATTRIB_STACK_DEPTH];
   /*@}*/

   /** \name 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_pixelstore_attrib  DefaultPacking; /**< Default params */
   /*@}*/

   /** \name Other assorted state (not pushed/popped on attribute stack) */
   /*@{*/
   struct gl_histogram_attrib   Histogram;
   struct gl_minmax_attrib      MinMax;
   struct gl_convolution_attrib Convolution1D;
   struct gl_convolution_attrib Convolution2D;
   struct gl_convolution_attrib Separable2D;

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

   struct gl_color_table ColorTable;       /**< Pre-convolution */
   struct gl_color_table ProxyColorTable;  /**< Pre-convolution */
   struct gl_color_table PostConvolutionColorTable;
   struct gl_color_table ProxyPostConvolutionColorTable;
   struct gl_color_table PostColorMatrixColorTable;
   struct gl_color_table ProxyPostColorMatrixColorTable;

   struct gl_program_state Program;        /**< for vertex or fragment progs */
   struct gl_vertex_program_state VertexProgram;   /**< GL_ARB/NV_vertex_program */
   struct gl_fragment_program_state FragmentProgram;  /**< GL_ARB/NV_vertex_program */
   struct gl_ati_fragment_shader_state ATIFragmentShader;  /**< GL_ATI_fragment_shader */

   struct fragment_program *_TexEnvProgram;     /**< Texture state as fragment program */
   struct vertex_program *_TnlProgram;          /**< Fixed func TNL state as vertex program */

   GLboolean _MaintainTnlProgram;
   GLboolean _MaintainTexEnvProgram;
   GLboolean _UseTexEnvProgram;

   struct gl_query_state Query;  /**< GL_ARB_occlusion_query */

   struct gl_shader_objects_state ShaderObjects;        /* GL_ARB_shader_objects */
   /*@}*/

#if FEATURE_EXT_framebuffer_object
   struct gl_renderbuffer *CurrentRenderbuffer;
#endif

   GLenum ErrorValue;        /**< Last error code */
   GLenum RenderMode;        /**< either GL_RENDER, GL_SELECT, GL_FEEDBACK */
   GLbitfield NewState;      /**< bitwise-or of _NEW_* flags */

   /** \name Derived state */
   /*@{*/
   GLbitfield _TriangleCaps;      /**< bitwise-or of DD_* flags */
   GLbitfield _ImageTransferState;/**< bitwise-or of IMAGE_*_BIT flags */
   GLfloat _EyeZDir[3];
   GLfloat _ModelViewInvScale;
   GLboolean _NeedEyeCoords;
   GLboolean _ForceEyeCoords; 
   GLenum _CurrentProgram;    /* currently executing program */

   struct gl_shine_tab *_ShineTable[2]; /**< Active shine tables */
   struct gl_shine_tab *_ShineTabList;  /**< MRU list of inactive shine tables */
   /**@}*/

   struct gl_list_extensions ListExt; /**< driver dlist extensions */


   GLuint _Facing; /**< This is a hack for 2-sided stencil test.
                    *
                    * We don't have a better way to communicate this value from
                    * swrast_setup to swrast. */

   /** \name For debugging/development only */
   /*@{*/
   GLboolean FirstTimeCurrent;
   /*@}*/

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

   /** software compression/decompression supported or not */
   GLboolean Mesa_DXTn;

   /** Core tnl module support */
   struct gl_tnl_module TnlModule;

   /**
    * \name Hooks for module contexts.  
    *
    * These will eventually live in the driver or elsewhere.
    */
   /*@{*/
   void *swrast_context;
   void *swsetup_context;
   void *swtnl_context;
   void *swtnl_im;
   void *acache_context;
   void *aelt_context;
   /*@}*/
};


/** The string names for GL_POINT, GL_LINE_LOOP, etc */
extern const char *_mesa_prim_name[GL_POLYGON+4];


#ifdef DEBUG
extern int MESA_VERBOSE;
extern int MESA_DEBUG_FLAGS;
# define MESA_FUNCTION __FUNCTION__
#else
# define MESA_VERBOSE 0
# define MESA_DEBUG_FLAGS 0
# define MESA_FUNCTION "a function"
# ifndef NDEBUG
#  define NDEBUG
# endif
#endif


enum _verbose
{
   VERBOSE_VARRAY               = 0x0001,
   VERBOSE_TEXTURE              = 0x0002,
   VERBOSE_IMMEDIATE            = 0x0004,
   VERBOSE_PIPELINE             = 0x0008,
   VERBOSE_DRIVER               = 0x0010,
   VERBOSE_STATE                = 0x0020,
   VERBOSE_API                  = 0x0040,
   VERBOSE_DISPLAY_LIST         = 0x0100,
   VERBOSE_LIGHTING             = 0x0200,
   VERBOSE_PRIMS                = 0x0400,
   VERBOSE_VERTS                = 0x0800,
   VERBOSE_DISASSEM             = 0x1000
};


enum _debug
{
   DEBUG_ALWAYS_FLUSH           = 0x1
};



#define Elements(x) sizeof(x)/sizeof(*(x))


#endif /* TYPES_H */