mesa: introduce a clear color union to be used for int/unsigned buffers

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

/*
 * Mesa 3-D graphics library
 * Version:  7.7
 *
 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
 * Copyright (C) 2009  VMware, Inc.  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.
 */

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

#ifndef MTYPES_H
#define MTYPES_H


#include "main/glheader.h"
#include "main/config.h"
#include "main/mfeatures.h"
#include "glapi/glapi.h"
#include "math/m_matrix.h"      /* GLmatrix */
#include "main/simple_list.h"   /* struct simple_node */
#include "main/formats.h"       /* MESA_FORMAT_COUNT */


/**
 * 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


/**
 * \name 64-bit extension of GLbitfield.
 */
/*@{*/
typedef GLuint64 GLbitfield64;

/** Set a single bit */
#define BITFIELD64_BIT(b)      ((GLbitfield64)1 << (b))


/**
 * \name Some forward type declarations
 */
/*@{*/
struct _mesa_HashTable;
struct gl_attrib_node;
struct gl_list_extensions;
struct gl_meta_state;
struct gl_pixelstore_attrib;
struct gl_program_cache;
struct gl_texture_format;
struct gl_texture_image;
struct gl_texture_object;
struct gl_context;
struct st_context;
/*@}*/


/** Extra draw modes beyond GL_POINTS, GL_TRIANGLE_FAN, etc */
#define PRIM_OUTSIDE_BEGIN_END   (GL_POLYGON+1)
#define PRIM_INSIDE_UNKNOWN_PRIM (GL_POLYGON+2)
#define PRIM_UNKNOWN             (GL_POLYGON+3)


/**
 * Shader stages. Note that these will become 5 with tessellation.
 * These MUST have the same values as gallium's PIPE_SHADER_*
 */
typedef enum
{
   MESA_SHADER_VERTEX = 0,
   MESA_SHADER_FRAGMENT = 1,
   MESA_SHADER_GEOMETRY = 2,
   MESA_SHADER_TYPES = 3
} gl_shader_type;



/**
 * 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).
 */
typedef 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_POINT_SIZE = 6,  /*alias*/
   VERT_ATTRIB_EDGEFLAG = 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
} gl_vert_attrib;

/**
 * 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_EDGEFLAG    (1 << VERT_ATTRIB_EDGEFLAG)
#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)))
/*@}*/


/**
 * Indexes for vertex program result attributes.  Note that
 * _mesa_vert_result_to_frag_attrib() and _mesa_frag_attrib_to_vert_result() make
 * assumptions about the layout of this enum.
 */
typedef enum
{
   VERT_RESULT_HPOS = 0,
   VERT_RESULT_COL0 = 1,
   VERT_RESULT_COL1 = 2,
   VERT_RESULT_FOGC = 3,
   VERT_RESULT_TEX0 = 4,
   VERT_RESULT_TEX1 = 5,
   VERT_RESULT_TEX2 = 6,
   VERT_RESULT_TEX3 = 7,
   VERT_RESULT_TEX4 = 8,
   VERT_RESULT_TEX5 = 9,
   VERT_RESULT_TEX6 = 10,
   VERT_RESULT_TEX7 = 11,
   VERT_RESULT_PSIZ = 12,
   VERT_RESULT_BFC0 = 13,
   VERT_RESULT_BFC1 = 14,
   VERT_RESULT_EDGE = 15,
   VERT_RESULT_VAR0 = 16,  /**< shader varying */
   VERT_RESULT_MAX = (VERT_RESULT_VAR0 + MAX_VARYING)
} gl_vert_result;


/*********************************************/

/**
 * Indexes for geometry program attributes.
 */
typedef enum
{
   GEOM_ATTRIB_POSITION = 0,
   GEOM_ATTRIB_COLOR0 = 1,
   GEOM_ATTRIB_COLOR1 = 2,
   GEOM_ATTRIB_SECONDARY_COLOR0 = 3,
   GEOM_ATTRIB_SECONDARY_COLOR1 = 4,
   GEOM_ATTRIB_FOG_FRAG_COORD = 5,
   GEOM_ATTRIB_POINT_SIZE = 6,
   GEOM_ATTRIB_CLIP_VERTEX = 7,
   GEOM_ATTRIB_PRIMITIVE_ID = 8,
   GEOM_ATTRIB_TEX_COORD = 9,

   GEOM_ATTRIB_VAR0 = 16,
   GEOM_ATTRIB_MAX = (GEOM_ATTRIB_VAR0 + MAX_VARYING)
} gl_geom_attrib;

/**
 * Bitflags for geometry attributes.
 * These are used in bitfields in many places.
 */
/*@{*/
#define GEOM_BIT_COLOR0      (1 << GEOM_ATTRIB_COLOR0)
#define GEOM_BIT_COLOR1      (1 << GEOM_ATTRIB_COLOR1)
#define GEOM_BIT_SCOLOR0     (1 << GEOM_ATTRIB_SECONDARY_COLOR0)
#define GEOM_BIT_SCOLOR1     (1 << GEOM_ATTRIB_SECONDARY_COLOR1)
#define GEOM_BIT_TEX_COORD   (1 << GEOM_ATTRIB_TEX_COORD)
#define GEOM_BIT_FOG_COORD   (1 << GEOM_ATTRIB_FOG_FRAG_COORD)
#define GEOM_BIT_POSITION    (1 << GEOM_ATTRIB_POSITION)
#define GEOM_BIT_POINT_SIDE  (1 << GEOM_ATTRIB_POINT_SIZE)
#define GEOM_BIT_CLIP_VERTEX (1 << GEOM_ATTRIB_CLIP_VERTEX)
#define GEOM_BIT_PRIM_ID     (1 << GEOM_ATTRIB_PRIMITIVE_ID)
#define GEOM_BIT_VAR0        (1 << GEOM_ATTRIB_VAR0)

#define GEOM_BIT_VAR(g)  (1 << (GEOM_BIT_VAR0 + (g)))
/*@}*/


/**
 * Indexes for geometry program result attributes
 */
typedef enum
{
   GEOM_RESULT_POS  = 0,
   GEOM_RESULT_COL0  = 1,
   GEOM_RESULT_COL1  = 2,
   GEOM_RESULT_SCOL0 = 3,
   GEOM_RESULT_SCOL1 = 4,
   GEOM_RESULT_FOGC = 5,
   GEOM_RESULT_TEX0 = 6,
   GEOM_RESULT_TEX1 = 7,
   GEOM_RESULT_TEX2 = 8,
   GEOM_RESULT_TEX3 = 9,
   GEOM_RESULT_TEX4 = 10,
   GEOM_RESULT_TEX5 = 11,
   GEOM_RESULT_TEX6 = 12,
   GEOM_RESULT_TEX7 = 13,
   GEOM_RESULT_PSIZ = 14,
   GEOM_RESULT_CLPV = 15,
   GEOM_RESULT_PRID = 16,
   GEOM_RESULT_LAYR = 17,
   GEOM_RESULT_VAR0 = 18,  /**< shader varying, should really be 16 */
   /* ### we need to -2 because var0 is 18 instead 16 like in the others */
   GEOM_RESULT_MAX  =  (GEOM_RESULT_VAR0 + MAX_VARYING - 2)
} gl_geom_result;


/**
 * Indexes for fragment program input attributes.  Note that
 * _mesa_vert_result_to_frag_attrib() and frag_attrib_to_vert_result() make
 * assumptions about the layout of this enum.
 */
typedef 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_FACE = 12,  /**< front/back face */
   FRAG_ATTRIB_PNTC = 13,  /**< sprite/point coord */
   FRAG_ATTRIB_VAR0 = 14,  /**< shader varying */
   FRAG_ATTRIB_MAX = (FRAG_ATTRIB_VAR0 + MAX_VARYING)
} gl_frag_attrib;


/**
 * Convert from a gl_vert_result value to the corresponding gl_frag_attrib.
 *
 * VERT_RESULT_HPOS is converted to FRAG_ATTRIB_WPOS.
 *
 * gl_vert_result values which have no corresponding gl_frag_attrib
 * (VERT_RESULT_PSIZ, VERT_RESULT_BFC0, VERT_RESULT_BFC1, and
 * VERT_RESULT_EDGE) are converted to a value of -1.
 */
static INLINE int
_mesa_vert_result_to_frag_attrib(gl_vert_result vert_result)
{
   if (vert_result >= VERT_RESULT_VAR0)
      return vert_result - VERT_RESULT_VAR0 + FRAG_ATTRIB_VAR0;
   else if (vert_result <= VERT_RESULT_TEX7)
      return vert_result;
   else
      return -1;
}


/**
 * Convert from a gl_frag_attrib value to the corresponding gl_vert_result.
 *
 * FRAG_ATTRIB_WPOS is converted to VERT_RESULT_HPOS.
 *
 * gl_frag_attrib values which have no corresponding gl_vert_result
 * (FRAG_ATTRIB_FACE and FRAG_ATTRIB_PNTC) are converted to a value of -1.
 */
static INLINE int
_mesa_frag_attrib_to_vert_result(gl_frag_attrib frag_attrib)
{
   if (frag_attrib <= FRAG_ATTRIB_TEX7)
      return frag_attrib;
   else if (frag_attrib >= FRAG_ATTRIB_VAR0)
      return frag_attrib - FRAG_ATTRIB_VAR0 + VERT_RESULT_VAR0;
   else
      return -1;
}


/**
 * 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_FACE  (1 << FRAG_ATTRIB_FACE)
#define FRAG_BIT_PNTC  (1 << FRAG_ATTRIB_PNTC)
#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_BIT_VAR0  (1 << FRAG_ATTRIB_VAR0)

#define FRAG_BIT_TEX(U)  (FRAG_BIT_TEX0 << (U))
#define FRAG_BIT_VAR(V)  (FRAG_BIT_VAR0 << (V))

#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
 */
typedef enum
{
   FRAG_RESULT_DEPTH = 0,
   FRAG_RESULT_STENCIL = 1,
   /* If a single color should be written to all render targets, this
    * register is written.  No FRAG_RESULT_DATAn will be written.
    */
   FRAG_RESULT_COLOR = 2,

   /* FRAG_RESULT_DATAn are the per-render-target (GLSL gl_FragData[n]
    * or ARB_fragment_program fragment.color[n]) color results.  If
    * any are written, FRAG_RESULT_COLOR will not be written.
    */
   FRAG_RESULT_DATA0 = 3,
   FRAG_RESULT_MAX = (FRAG_RESULT_DATA0 + MAX_DRAW_BUFFERS)
} gl_frag_result;


/**
 * Indexes for all renderbuffers
 */
typedef enum
{
   /* the four standard color buffers */
   BUFFER_FRONT_LEFT,
   BUFFER_BACK_LEFT,
   BUFFER_FRONT_RIGHT,
   BUFFER_BACK_RIGHT,
   BUFFER_DEPTH,
   BUFFER_STENCIL,
   BUFFER_ACCUM,
   /* optional aux buffer */
   BUFFER_AUX0,
   /* generic renderbuffers */
   BUFFER_COLOR0,
   BUFFER_COLOR1,
   BUFFER_COLOR2,
   BUFFER_COLOR3,
   BUFFER_COLOR4,
   BUFFER_COLOR5,
   BUFFER_COLOR6,
   BUFFER_COLOR7,
   BUFFER_COUNT
} gl_buffer_index;

/**
 * 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_COLOR0 | \
                            BUFFER_BIT_COLOR1 | \
                            BUFFER_BIT_COLOR2 | \
                            BUFFER_BIT_COLOR3 | \
                            BUFFER_BIT_COLOR4 | \
                            BUFFER_BIT_COLOR5 | \
                            BUFFER_BIT_COLOR6 | \
                            BUFFER_BIT_COLOR7)


/**
 * Framebuffer configuration (aka visual / pixelformat)
 * Note: some of these fields should be boolean, but it appears that
 * code in drivers/dri/common/util.c requires int-sized fields.
 */
struct gl_config
{
   GLboolean rgbMode;
   GLboolean floatMode;
   GLboolean colorIndexMode;  /* XXX is this used anywhere? */
   GLuint doubleBufferMode;
   GLuint stereoMode;

   GLboolean haveAccumBuffer;
   GLboolean haveDepthBuffer;
   GLboolean haveStencilBuffer;

   GLint redBits, greenBits, blueBits, alphaBits;       /* bits per comp */
   GLuint redMask, greenMask, blueMask, alphaMask;
   GLint rgbBits;               /* total bits for rgb */
   GLint indexBits;             /* total bits for colorindex */

   GLint accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits;
   GLint depthBits;
   GLint stencilBits;

   GLint numAuxBuffers;

   GLint level;

   /* EXT_visual_rating / GLX 1.2 */
   GLint visualRating;

   /* EXT_visual_info / GLX 1.2 */
   GLint transparentPixel;
   /*    colors are floats scaled to ints */
   GLint transparentRed, transparentGreen, transparentBlue, transparentAlpha;
   GLint transparentIndex;

   /* ARB_multisample / SGIS_multisample */
   GLint sampleBuffers;
   GLint samples;

   /* SGIX_pbuffer / GLX 1.3 */
   GLint maxPbufferWidth;
   GLint maxPbufferHeight;
   GLint maxPbufferPixels;
   GLint optimalPbufferWidth;   /* Only for SGIX_pbuffer. */
   GLint optimalPbufferHeight;  /* Only for SGIX_pbuffer. */

   /* OML_swap_method */
   GLint swapMethod;

   /* EXT_texture_from_pixmap */
   GLint bindToTextureRgb;
   GLint bindToTextureRgba;
   GLint bindToMipmapTexture;
   GLint bindToTextureTargets;
   GLint yInverted;

   /* EXT_framebuffer_sRGB */
   GLint sRGBCapable;
};


/**
 * \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 SpotDirection[4];    /**< spotlight direction 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 _NormSpotDirection[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 */
};

union gl_color_union {
   GLfloat f[4];
   GLint i[4];
   GLuint ui[4];
};

/**
 * Color buffer attribute group (GL_COLOR_BUFFER_BIT).
 */
struct gl_colorbuffer_attrib
{
   GLuint ClearIndex;                   /**< Index to use for glClear */
   union gl_color_union ClearColor;     /**< Color to use for glClear - this vale is unclamped */
   GLuint IndexMask;                    /**< Color index write mask */
   GLubyte ColorMask[MAX_DRAW_BUFFERS][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 */
   GLfloat AlphaRefUnclamped;
   GLclampf AlphaRef;                   /**< Alpha reference value */
   /*@}*/

   /** 
    * \name Blending
    */
   /*@{*/
   GLbitfield BlendEnabled;             /**< Per-buffer blend enable flags */

   /* NOTE: this does _not_ depend on fragment clamping or any other clamping control,
    * only on the fixed-pointness of the render target.
    * The query does however depend on fragment color clamping.
    */
   GLfloat BlendColorUnclamped[4];               /**< Blending color */
   GLfloat BlendColor[4];               /**< Blending color */

   struct
   {
      GLenum SrcRGB;             /**< RGB blend source term */
      GLenum DstRGB;             /**< RGB blend dest term */
      GLenum SrcA;               /**< Alpha blend source term */
      GLenum DstA;               /**< Alpha blend dest term */
      GLenum EquationRGB;        /**< GL_ADD, GL_SUBTRACT, etc. */
      GLenum EquationA;          /**< GL_ADD, GL_SUBTRACT, etc. */
   } Blend[MAX_DRAW_BUFFERS];
   /** Are the blend func terms currently different for each buffer/target? */
   GLboolean _BlendFuncPerBuffer;
   /** Are the blend equations currently different for each buffer/target? */
   GLboolean _BlendEquationPerBuffer;
   /*@}*/

   /** 
    * \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 */
   GLboolean _ClampFragmentColor; /** < with GL_FIXED_ONLY_ARB resolved */
   GLenum ClampReadColor;     /**< GL_TRUE, GL_FALSE or GL_FIXED_ONLY_ARB */
   GLboolean _ClampReadColor;     /** < with GL_FIXED_ONLY_ARB resolved */

   GLboolean sRGBEnabled;       /**< Framebuffer sRGB blending/updating requested */
};


/**
 * 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.
    * \note Index and Edgeflag current values are stored as floats in the 
    * SIX and SEVEN attribute slots.
    */
   GLfloat Attrib[VERT_ATTRIB_MAX][4];  /**< Position, color, texcoords, etc */

   /**
    * \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 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 */
};


/**
 * 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 ColorUnclamped[4];            /**< Fog color */
   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) */
};


/**
 * \brief Layout qualifiers for gl_FragDepth.
 *
 * Extension AMD_conservative_depth allows gl_FragDepth to be redeclared with
 * a layout qualifier.
 *
 * \see enum ir_depth_layout
 */
enum gl_frag_depth_layout {
    FRAG_DEPTH_LAYOUT_NONE, /**< No layout is specified. */
    FRAG_DEPTH_LAYOUT_ANY,
    FRAG_DEPTH_LAYOUT_GREATER,
    FRAG_DEPTH_LAYOUT_LESS,
    FRAG_DEPTH_LAYOUT_UNCHANGED
};


/** 
 * 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 */
};

/**
 * 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 ProvokingVertex;              /**< GL_EXT_provoking_vertex */
   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;
   GLenum ClampVertexColor;
   GLboolean _ClampVertexColor;

   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 */
};


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


/**
 * Multisample attribute group (GL_MULTISAMPLE_BIT).
 */
struct gl_multisample_attrib
{
   GLboolean Enabled;
   GLboolean _Enabled;   /**< true if Enabled and multisample buffer */
   GLboolean SampleAlphaToCoverage;
   GLboolean SampleAlphaToOne;
   GLboolean SampleCoverage;
   GLfloat SampleCoverageValue;
   GLboolean SampleCoverageInvert;
};


/**
 * A pixelmap (see glPixelMap)
 */
struct gl_pixelmap
{
   GLint Size;
   GLfloat Map[MAX_PIXEL_MAP_TABLE];
   GLubyte Map8[MAX_PIXEL_MAP_TABLE];  /**< converted to 8-bit color */
};


/**
 * Collection of all pixelmaps
 */
struct gl_pixelmaps
{
   struct gl_pixelmap RtoR;  /**< i.e. GL_PIXEL_MAP_R_TO_R */
   struct gl_pixelmap GtoG;
   struct gl_pixelmap BtoB;
   struct gl_pixelmap AtoA;
   struct gl_pixelmap ItoR;
   struct gl_pixelmap ItoG;
   struct gl_pixelmap ItoB;
   struct gl_pixelmap ItoA;
   struct gl_pixelmap ItoI;
   struct gl_pixelmap StoS;
};


/**
 * Pixel attribute group (GL_PIXEL_MODE_BIT).
 */
struct gl_pixel_attrib
{
   GLenum ReadBuffer;           /**< source buffer for glRead/CopyPixels() */

   /*--- Begin Pixel Transfer State ---*/
   /* Fields are in the order in which they're applied... */

   /** Scale & Bias (index shift, offset) */
   /*@{*/
   GLfloat RedBias, RedScale;
   GLfloat GreenBias, GreenScale;
   GLfloat BlueBias, BlueScale;
   GLfloat AlphaBias, AlphaScale;
   GLfloat DepthBias, DepthScale;
   GLint IndexShift, IndexOffset;
   /*@}*/

   /* Pixel Maps */
   /* Note: actual pixel maps are not part of this attrib group */
   GLboolean MapColorFlag;
   GLboolean MapStencilFlag;

   /*--- End Pixel Transfer State ---*/

   /** glPixelZoom */
   GLfloat ZoomX, ZoomY;
};


/**
 * 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 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).
 *
 * Three sets of stencil data are tracked so that OpenGL 2.0,
 * GL_EXT_stencil_two_side, and GL_ATI_separate_stencil can all be supported
 * simultaneously.  In each of the stencil state arrays, element 0 corresponds
 * to GL_FRONT.  Element 1 corresponds to the OpenGL 2.0 /
 * GL_ATI_separate_stencil GL_BACK state.  Element 2 corresponds to the
 * GL_EXT_stencil_two_side GL_BACK state.
 *
 * The derived value \c _BackFace is either 1 or 2 depending on whether or
 * not GL_STENCIL_TEST_TWO_SIDE_EXT is enabled.
 *
 * The derived value \c _TestTwoSide is set when the front-face and back-face
 * stencil state are different.
 */
struct gl_stencil_attrib
{
   GLboolean Enabled;           /**< Enabled flag */
   GLboolean TestTwoSide;       /**< GL_EXT_stencil_two_side */
   GLubyte ActiveFace;          /**< GL_EXT_stencil_two_side (0 or 2) */
   GLboolean _Enabled;          /**< Enabled and stencil buffer present */
   GLboolean _TestTwoSide;
   GLubyte _BackFace;           /**< Current back stencil state (1 or 2) */
   GLenum Function[3];          /**< Stencil function */
   GLenum FailFunc[3];          /**< Fail function */
   GLenum ZPassFunc[3];         /**< Depth buffer pass function */
   GLenum ZFailFunc[3];         /**< Depth buffer fail function */
   GLint Ref[3];                /**< Reference value */
   GLuint ValueMask[3];         /**< Value mask */
   GLuint WriteMask[3];         /**< Write mask */
   GLuint Clear;                /**< Clear value */
};


/**
 * An index for each type of texture object.  These correspond to the GL
 * texture target enums, such as GL_TEXTURE_2D, GL_TEXTURE_CUBE_MAP, etc.
 * Note: the order is from highest priority to lowest priority.
 */
typedef enum
{
   TEXTURE_BUFFER_INDEX,
   TEXTURE_2D_ARRAY_INDEX,
   TEXTURE_1D_ARRAY_INDEX,
   TEXTURE_CUBE_INDEX,
   TEXTURE_3D_INDEX,
   TEXTURE_RECT_INDEX,
   TEXTURE_2D_INDEX,
   TEXTURE_1D_INDEX,
   NUM_TEXTURE_TARGETS
} gl_texture_index;


/**
 * Bit flags for each type of texture object
 * Used for Texture.Unit[]._ReallyEnabled flags.
 */
/*@{*/
#define TEXTURE_BUFFER_BIT   (1 << TEXTURE_BUFFER_INDEX)
#define TEXTURE_2D_ARRAY_BIT (1 << TEXTURE_2D_ARRAY_INDEX)
#define TEXTURE_1D_ARRAY_BIT (1 << TEXTURE_1D_ARRAY_INDEX)
#define TEXTURE_CUBE_BIT     (1 << TEXTURE_CUBE_INDEX)
#define TEXTURE_3D_BIT       (1 << TEXTURE_3D_INDEX)
#define TEXTURE_RECT_BIT     (1 << TEXTURE_RECT_INDEX)
#define TEXTURE_2D_BIT       (1 << TEXTURE_2D_INDEX)
#define TEXTURE_1D_BIT       (1 << TEXTURE_1D_INDEX)
/*@}*/


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


/**
 * 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)
/*@}*/



/** Tex-gen enabled for texture unit? */
#define ENABLE_TEXGEN(unit) (1 << (unit))

/** Non-identity texture matrix for texture unit? */
#define ENABLE_TEXMAT(unit) (1 << (unit))


/**
 * 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);


/**
 * Texture image state.  Describes the dimensions of a texture image,
 * the texel format and pointers to Texel Fetch functions.
 */
struct gl_texture_image
{
   GLint InternalFormat;        /**< Internal format as given by the user */
   GLenum _BaseFormat;          /**< Either GL_RGB, GL_RGBA, GL_ALPHA,
                                 *   GL_LUMINANCE, GL_LUMINANCE_ALPHA,
                                 *   GL_INTENSITY, GL_DEPTH_COMPONENT or
                                 *   GL_DEPTH_STENCIL_EXT only. Used for
                                 *   choosing TexEnv arithmetic.
                                 */
   gl_format TexFormat;         /**< The actual texture memory format */

   GLuint Border;               /**< 0 or 1 */
   GLuint Width;                /**< = 2^WidthLog2 + 2*Border */
   GLuint Height;               /**< = 2^HeightLog2 + 2*Border */
   GLuint Depth;                /**< = 2^DepthLog2 + 2*Border */
   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 */
   GLboolean IsClientData;      /**< Data owned by client? */
   GLboolean _IsPowerOfTwo;     /**< Are all dimensions powers of two? */

   struct gl_texture_object *TexObject;  /**< Pointer back to parent object */
   GLuint Level;                /**< Which mipmap level am I? */
   /** Cube map face: index into gl_texture_object::Image[] array */
   GLuint Face;

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

   GLuint RowStride;            /**< Padded width in units of texels */
   GLuint *ImageOffsets;        /**< if 3D texture: array [Depth] of offsets to
                                     each 2D slice in 'Data', in texels */
   GLvoid *Data;                /**< Image data, accessed via FetchTexel() */

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


/**
 * Indexes for cube map faces.
 */
typedef enum
{
   FACE_POS_X = 0,
   FACE_NEG_X = 1,
   FACE_POS_Y = 2,
   FACE_NEG_Y = 3,
   FACE_POS_Z = 4,
   FACE_NEG_Z = 5,
   MAX_FACES = 6
} gl_face_index;


/**
 * Sampler object state.  These objects are new with GL_ARB_sampler_objects
 * and OpenGL 3.3.  Legacy texture objects also contain a sampler object.
 */
struct gl_sampler_object
{
   GLuint Name;
   GLint RefCount;

   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 */
   union gl_color_union BorderColor;  /**< Interpreted according to texture format */
   GLfloat MinLod;              /**< min lambda, OpenGL 1.2 */
   GLfloat MaxLod;              /**< max lambda, OpenGL 1.2 */
   GLfloat LodBias;             /**< OpenGL 1.4 */
   GLfloat MaxAnisotropy;       /**< GL_EXT_texture_filter_anisotropic */
   GLenum CompareMode;          /**< GL_ARB_shadow */
   GLenum CompareFunc;          /**< GL_ARB_shadow */
   GLfloat CompareFailValue;    /**< GL_ARB_shadow_ambient */
   GLenum sRGBDecode;           /**< GL_DECODE_EXT or GL_SKIP_DECODE_EXT */
   GLboolean CubeMapSeamless;   /**< GL_AMD_seamless_cubemap_per_texture */

   /* deprecated sampler state */
   GLenum DepthMode;            /**< GL_ARB_depth_texture */

   /** Is the texture object complete with respect to this sampler? */
   GLboolean _CompleteTexture;
};


/**
 * Texture object state.  Contains the array of mipmap images, border color,
 * wrap modes, filter modes, and shadow/texcompare state.
 */
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. */

   struct gl_sampler_object Sampler;

   GLfloat Priority;            /**< in [0,1] */
   GLint BaseLevel;             /**< min mipmap level, OpenGL 1.2 */
   GLint MaxLevel;              /**< max mipmap level, OpenGL 1.2 */
   GLint _MaxLevel;             /**< actual max mipmap level (q in the spec) */
   GLfloat _MaxLambda;          /**< = _MaxLevel - BaseLevel (q - b in spec) */
   GLint CropRect[4];           /**< GL_OES_draw_texture */
   GLenum Swizzle[4];           /**< GL_EXT_texture_swizzle */
   GLuint _Swizzle;             /**< same as Swizzle, but SWIZZLE_* format */
   GLboolean GenerateMipmap;    /**< GL_SGIS_generate_mipmap */
   GLboolean _Complete;         /**< Is texture object complete? */
   GLboolean _RenderToTexture;  /**< Any rendering to this texture? */
   GLboolean Purgeable;         /**< Is the buffer purgeable under memory pressure? */

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

   /** GL_ARB_texture_buffer_object */
   struct gl_buffer_object *BufferObject;
   GLenum BufferObjectFormat;

   /**
    * \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 */
};


/** Up to four combiner sources are possible with GL_NV_texture_env_combine4 */
#define MAX_COMBINER_TERMS 4


/**
 * Texture combine environment state.
 */
struct gl_tex_env_combine_state
{
   GLenum ModeRGB;       /**< GL_REPLACE, GL_DECAL, GL_ADD, etc. */
   GLenum ModeA;         /**< GL_REPLACE, GL_DECAL, GL_ADD, etc. */
   /** Source terms: GL_PRIMARY_COLOR, GL_TEXTURE, etc */
   GLenum SourceRGB[MAX_COMBINER_TERMS];
   GLenum SourceA[MAX_COMBINER_TERMS];
   /** Source operands: GL_SRC_COLOR, GL_ONE_MINUS_SRC_COLOR, etc */
   GLenum OperandRGB[MAX_COMBINER_TERMS];
   GLenum OperandA[MAX_COMBINER_TERMS];
   GLuint ScaleShiftRGB; /**< 0, 1 or 2 */
   GLuint ScaleShiftA;   /**< 0, 1 or 2 */
   GLuint _NumArgsRGB;   /**< Number of inputs used for the RGB combiner */
   GLuint _NumArgsA;     /**< Number of inputs used for the A combiner */
};


/**
 * Texture coord generation state.
 */
struct gl_texgen
{
   GLenum Mode;         /**< GL_EYE_LINEAR, GL_SPHERE_MAP, etc */
   GLbitfield _ModeBit; /**< TEXGEN_x bit corresponding to Mode */
   GLfloat ObjectPlane[4];
   GLfloat EyePlane[4];
};


/**
 * Texture unit state.  Contains enable flags, texture environment/function/
 * combiners, texgen state, and pointers to current texture objects.
 */
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. */
   GLclampf EnvColor[4];
   GLfloat EnvColorUnclamped[4];

   struct gl_texgen GenS;
   struct gl_texgen GenT;
   struct gl_texgen GenR;
   struct gl_texgen GenQ;
   GLbitfield TexGenEnabled;    /**< Bitwise-OR of [STRQ]_BIT values */
   GLbitfield _GenFlags;        /**< Bitwise-OR of Gen[STRQ]._ModeBit */

   GLfloat LodBias;             /**< for biasing mipmap levels */
   GLenum BumpTarget;
   GLfloat RotMatrix[4]; /* 2x2 matrix */

   /** Current sampler object (GL_ARB_sampler_objects) */
   struct gl_sampler_object *Sampler;

   /** 
    * \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;

   /** Current texture object pointers */
   struct gl_texture_object *CurrentTex[NUM_TEXTURE_TARGETS];

   /** Points to highest priority, complete and enabled texture object */
   struct gl_texture_object *_Current;
};


/**
 * Texture attribute group (GL_TEXTURE_BIT).
 */
struct gl_texture_attrib
{
   GLuint CurrentUnit;   /**< GL_ACTIVE_TEXTURE */
   struct gl_texture_unit Unit[MAX_COMBINED_TEXTURE_IMAGE_UNITS];

   struct gl_texture_object *ProxyTex[NUM_TEXTURE_TARGETS];

   /** GL_ARB_texture_buffer_object */
   struct gl_buffer_object *BufferObject;

   /** GL_ARB_seamless_cubemap */
   GLboolean CubeMapSeamless;

   /** Texture units/samplers used by vertex or fragment texturing */
   GLbitfield _EnabledUnits;

   /** Texture coord units/sets used for fragment texturing */
   GLbitfield _EnabledCoordUnits;

   /** Texture coord units that have texgen enabled */
   GLbitfield _TexGenEnabled;

   /** Texture coord units that have non-identity matrices */
   GLbitfield _TexMatEnabled;

   /** Bitwise-OR of all Texture.Unit[i]._GenFlags */
   GLbitfield _GenFlags;
};


/**
 * 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 DepthClamp;                        /**< GL_ARB_depth_clamp */

   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. */
};


/**
 * GL_ARB_vertex/pixel_buffer_object buffer object
 */
struct gl_buffer_object
{
   _glthread_Mutex Mutex;
   GLint RefCount;
   GLuint Name;
   GLenum Usage;        /**< GL_STREAM_DRAW_ARB, GL_STREAM_READ_ARB, etc. */
   GLsizeiptrARB Size;  /**< Size of buffer storage in bytes */
   GLubyte *Data;       /**< Location of storage either in RAM or VRAM. */
   /** Fields describing a mapped buffer */
   /*@{*/
   GLbitfield AccessFlags; /**< Mask of GL_MAP_x_BIT flags */
   GLvoid *Pointer;     /**< User-space address of mapping */
   GLintptr Offset;     /**< Mapped offset */
   GLsizeiptr Length;   /**< Mapped length */
   /*@}*/
   GLboolean Written;   /**< Ever written to? (for debugging) */
   GLboolean Purgeable; /**< Is the buffer purgeable under memory pressure? */
};


/**
 * Client pixel packing/unpacking attributes
 */
struct gl_pixelstore_attrib
{
   GLint Alignment;
   GLint RowLength;
   GLint SkipPixels;
   GLint SkipRows;
   GLint ImageHeight;
   GLint SkipImages;
   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 */
};


/**
 * 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 */
   GLenum Format;               /**< default: GL_RGBA, but may be GL_BGRA */
   GLsizei Stride;              /**< user-specified stride */
   GLsizei StrideB;             /**< actual stride in bytes */
   const GLubyte *Ptr;          /**< Points to array data */
   GLboolean Enabled;           /**< Enabled flag is a boolean */
   GLboolean Normalized;        /**< GL_ARB_vertex_program */
   GLboolean Integer;           /**< Integer-valued? */
   GLuint InstanceDivisor;      /**< GL_ARB_instanced_arrays */
   GLuint _ElementSize;         /**< size of each element in bytes */

   struct gl_buffer_object *BufferObj;/**< GL_ARB_vertex_buffer_object */
   GLuint _MaxElement;          /**< max element index into array buffer + 1 */
};


/**
 * Collection of vertex arrays.  Defined by the GL_APPLE_vertex_array_object
 * extension, but a nice encapsulation in any case.
 */
struct gl_array_object
{
   /** Name of the array object as received from glGenVertexArrayAPPLE. */
   GLuint Name;

   GLint RefCount;
   _glthread_Mutex Mutex;
   GLboolean VBOonly;  /**< require all arrays to live in VBOs? */

   /** Conventional vertex arrays */
   /*@{*/
   struct gl_client_array Vertex;
   struct gl_client_array Weight;
   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 EdgeFlag;
   struct gl_client_array TexCoord[MAX_TEXTURE_COORD_UNITS];
   struct gl_client_array PointSize;
   /*@}*/

   /**
    * Generic arrays for vertex programs/shaders.
    * For NV vertex programs, these attributes alias and take priority
    * over the conventional attribs above.  For ARB vertex programs and
    * GLSL vertex shaders, these attributes are separate.
    */
   struct gl_client_array VertexAttrib[MAX_VERTEX_GENERIC_ATTRIBS];

   /** Mask of _NEW_ARRAY_* values indicating which arrays are enabled */
   GLbitfield _Enabled;

   /**
    * Min of all enabled arrays' _MaxElement.  When arrays reside inside VBOs
    * we can determine the max legal (in bounds) glDrawElements array index.
    */
   GLuint _MaxElement;
};


/**
 * Vertex array state
 */
struct gl_array_attrib
{
   /** Currently bound array object. See _mesa_BindVertexArrayAPPLE() */
   struct gl_array_object *ArrayObj;

   /** The default vertex array object */
   struct gl_array_object *DefaultArrayObj;

   /** Array objects (GL_ARB/APPLE_vertex_array_object) */
   struct _mesa_HashTable *Objects;

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

   /** GL 3.1 (slightly different from GL_NV_primitive_restart) */
   GLboolean PrimitiveRestart;
   GLuint RestartIndex;

   GLbitfield NewState;         /**< mask of _NEW_ARRAY_* values */
   GLboolean RebindArrays; /**< whether the VBO module should rebind arrays */

   /* GL_ARB_vertex_buffer_object */
   struct gl_buffer_object *ArrayBufferObj;
   struct gl_buffer_object *ElementArrayBufferObj;
};


/**
 * 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 */
   /*@}*/
};


/**
 * 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.
 *
 * NOTE: PROGRAM_ENV_PARAM, PROGRAM_STATE_VAR, PROGRAM_NAMED_PARAM,
 * PROGRAM_CONSTANT, and PROGRAM_UNIFORM can all be considered to
 * be "uniform" variables since they can only be set outside glBegin/End.
 * They're also all stored in the same Parameters array.
 */
typedef enum
{
   PROGRAM_TEMPORARY,   /**< machine->Temporary[] */
   PROGRAM_INPUT,       /**< machine->Inputs[] */
   PROGRAM_OUTPUT,      /**< machine->Outputs[] */
   PROGRAM_VARYING,     /**< machine->Inputs[]/Outputs[] */
   PROGRAM_LOCAL_PARAM, /**< gl_program->LocalParams[] */
   PROGRAM_ENV_PARAM,   /**< gl_program->Parameters[] */
   PROGRAM_STATE_VAR,   /**< gl_program->Parameters[] */
   PROGRAM_NAMED_PARAM, /**< gl_program->Parameters[] */
   PROGRAM_CONSTANT,    /**< gl_program->Parameters[] */
   PROGRAM_UNIFORM,     /**< gl_program->Parameters[] */
   PROGRAM_WRITE_ONLY,  /**< A dummy, write-only register */
   PROGRAM_ADDRESS,     /**< machine->AddressReg */
   PROGRAM_SAMPLER,     /**< for shader samplers, compile-time only */
   PROGRAM_SYSTEM_VALUE,/**< InstanceId, PrimitiveID, etc. */
   PROGRAM_UNDEFINED,   /**< Invalid/TBD value */
   PROGRAM_FILE_MAX
} gl_register_file;


/**
 * If the register file is PROGRAM_SYSTEM_VALUE, the register index will be
 * one of these values.
 */
typedef enum
{
   SYSTEM_VALUE_FRONT_FACE,  /**< Fragment shader only (not done yet) */
   SYSTEM_VALUE_INSTANCE_ID, /**< Vertex shader only */
   SYSTEM_VALUE_MAX          /**< Number of values */
} gl_system_value;


/** Vertex and fragment instructions */
struct prog_instruction;
struct gl_program_parameter_list;
struct gl_uniform_list;


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

   struct prog_instruction *Instructions;

   GLbitfield InputsRead;     /**< Bitmask of which input regs are read */
   GLbitfield64 OutputsWritten; /**< Bitmask of which output regs are written */
   GLbitfield SystemValuesRead;   /**< Bitmask of SYSTEM_VALUE_x inputs used */
   GLbitfield InputFlags[MAX_PROGRAM_INPUTS];   /**< PROG_PARAM_BIT_x flags */
   GLbitfield OutputFlags[MAX_PROGRAM_OUTPUTS]; /**< PROG_PARAM_BIT_x flags */
   GLbitfield TexturesUsed[MAX_COMBINED_TEXTURE_IMAGE_UNITS];  /**< TEXTURE_x_BIT bitmask */
   GLbitfield SamplersUsed;   /**< Bitfield of which samplers are used */
   GLbitfield ShadowSamplers; /**< Texture units used for shadow sampling. */


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

   /** Vertex/fragment shader varying vars */
   struct gl_program_parameter_list *Varying;
   /** Vertex program user-defined attributes */
   struct gl_program_parameter_list *Attributes;

   /** Map from sampler unit to texture unit (set by glUniform1i()) */
   GLubyte SamplerUnits[MAX_SAMPLERS];
   /** Which texture target is being sampled (TEXTURE_1D/2D/3D/etc_INDEX) */
   gl_texture_index SamplerTargets[MAX_SAMPLERS];

   /** Bitmask of which register files are read/written with indirect
    * addressing.  Mask of (1 << PROGRAM_x) bits.
    */
   GLbitfield IndirectRegisterFiles;

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


/** Vertex program object */
struct gl_vertex_program
{
   struct gl_program Base;   /**< base class */
   GLboolean IsNVProgram;    /**< is this a GL_NV_vertex_program program? */
   GLboolean IsPositionInvariant;
};


/** Geometry program object */
struct gl_geometry_program
{
   struct gl_program Base;   /**< base class */

   GLint VerticesOut;
   GLenum InputType;  /**< GL_POINTS, GL_LINES, GL_LINES_ADJACENCY_ARB,
                           GL_TRIANGLES, or GL_TRIANGLES_ADJACENCY_ARB */
   GLenum OutputType; /**< GL_POINTS, GL_LINE_STRIP or GL_TRIANGLE_STRIP */
};


/** Fragment program object */
struct gl_fragment_program
{
   struct gl_program Base;   /**< base class */
   GLboolean UsesKill;          /**< shader uses KIL instruction */
   GLboolean OriginUpperLeft;
   GLboolean PixelCenterInteger;
   enum gl_frag_depth_layout FragDepthLayout;
};


/**
 * 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 */
};


/**
 * Context state for vertex programs.
 */
struct gl_vertex_program_state
{
   GLboolean Enabled;            /**< User-set GL_VERTEX_PROGRAM_ARB/NV flag */
   GLboolean _Enabled;           /**< Enabled and _valid_ user program? */
   GLboolean PointSizeEnabled;   /**< GL_VERTEX_PROGRAM_POINT_SIZE_ARB/NV */
   GLboolean TwoSideEnabled;     /**< GL_VERTEX_PROGRAM_TWO_SIDE_ARB/NV */
   struct gl_vertex_program *Current;  /**< User-bound vertex program */

   /** Currently enabled and valid vertex program (including internal
    * programs, user-defined vertex programs and GLSL vertex shaders).
    * This is the program we must use when rendering.
    */
   struct gl_vertex_program *_Current;

   GLfloat Parameters[MAX_PROGRAM_ENV_PARAMS][4]; /**< Env params */

   /* For GL_NV_vertex_program only: */
   GLenum TrackMatrix[MAX_PROGRAM_ENV_PARAMS / 4];
   GLenum TrackMatrixTransform[MAX_PROGRAM_ENV_PARAMS / 4];

   /** Should fixed-function T&L be implemented with a vertex prog? */
   GLboolean _MaintainTnlProgram;

   /** Program to emulate fixed-function T&L (see above) */
   struct gl_vertex_program *_TnlProgram;

   /** Cache of fixed-function programs */
   struct gl_program_cache *Cache;

   GLboolean _Overriden;
};


/**
 * Context state for geometry programs.
 */
struct gl_geometry_program_state
{
   GLboolean Enabled;               /**< GL_ARB_GEOMETRY_SHADER4 */
   GLboolean _Enabled;              /**< Enabled and valid program? */
   struct gl_geometry_program *Current;  /**< user-bound geometry program */

   /** Currently enabled and valid program (including internal programs
    * and compiled shader programs).
    */
   struct gl_geometry_program *_Current;

   GLfloat Parameters[MAX_PROGRAM_ENV_PARAMS][4]; /**< Env params */

   /** Cache of fixed-function programs */
   struct gl_program_cache *Cache;
};

/**
 * Context state for fragment programs.
 */
struct gl_fragment_program_state
{
   GLboolean Enabled;     /**< User-set fragment program enable flag */
   GLboolean _Enabled;    /**< Enabled and _valid_ user program? */
   struct gl_fragment_program *Current;  /**< User-bound fragment program */

   /** Currently enabled and valid fragment program (including internal
    * programs, user-defined fragment programs and GLSL fragment shaders).
    * This is the program we must use when rendering.
    */
   struct gl_fragment_program *_Current;

   GLfloat Parameters[MAX_PROGRAM_ENV_PARAMS][4]; /**< Env params */

   /** Should fixed-function texturing be implemented with a fragment prog? */
   GLboolean _MaintainTexEnvProgram;

   /** Program to emulate fixed-function texture env/combine (see above) */
   struct gl_fragment_program *_TexEnvProgram;

   /** Cache of fixed-function programs */
   struct gl_program_cache *Cache;
};


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

struct atifs_instruction;
struct atifs_setupinst;

/**
 * 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 ati_fragment_shader *Current;
};


/**
 * Occlusion/timer query object.
 */
struct gl_query_object
{
   GLenum Target;      /**< The query target, when active */
   GLuint Id;          /**< hash table ID/name */
   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 */

   /** GL_NV_conditional_render */
   struct gl_query_object *CondRenderQuery;

   /** GL_EXT_transform_feedback */
   struct gl_query_object *PrimitivesGenerated;
   struct gl_query_object *PrimitivesWritten;

   /** GL_ARB_timer_query */
   struct gl_query_object *TimeElapsed;

   GLenum CondRenderMode;
};


/** Sync object state */
struct gl_sync_object {
   struct simple_node link;
   GLenum Type;               /**< GL_SYNC_FENCE */
   GLuint Name;               /**< Fence name */
   GLint RefCount;            /**< Reference count */
   GLboolean DeletePending;   /**< Object was deleted while there were still
                               * live references (e.g., sync not yet finished)
                               */
   GLenum SyncCondition;
   GLbitfield Flags;          /**< Flags passed to glFenceSync */
   GLuint StatusFlag:1;       /**< Has the sync object been signaled? */
};


/** Set by #pragma directives */
struct gl_sl_pragmas
{
   GLboolean IgnoreOptimize;  /**< ignore #pragma optimize(on/off) ? */
   GLboolean IgnoreDebug;     /**< ignore #pragma debug(on/off) ? */
   GLboolean Optimize;  /**< defaults on */
   GLboolean Debug;     /**< defaults off */
};


/**
 * A GLSL vertex or fragment shader object.
 */
struct gl_shader
{
   GLenum Type;  /**< GL_FRAGMENT_SHADER || GL_VERTEX_SHADER || GL_GEOMETRY_SHADER_ARB (first field!) */
   GLuint Name;  /**< AKA the handle */
   GLint RefCount;  /**< Reference count */
   GLboolean DeletePending;
   GLboolean CompileStatus;
   const GLchar *Source;  /**< Source code string */
   GLuint SourceChecksum;       /**< for debug/logging purposes */
   struct gl_program *Program;  /**< Post-compile assembly code */
   GLchar *InfoLog;
   struct gl_sl_pragmas Pragmas;

   unsigned Version;       /**< GLSL version used for linking */

   struct exec_list *ir;
   struct glsl_symbol_table *symbols;

   /** Shaders containing built-in functions that are used for linking. */
   struct gl_shader *builtins_to_link[16];
   unsigned num_builtins_to_link;
};


/**
 * A GLSL program object.
 * Basically a linked collection of vertex and fragment shaders.
 */
struct gl_shader_program
{
   GLenum Type;  /**< Always GL_SHADER_PROGRAM (internal token) */
   GLuint Name;  /**< aka handle or ID */
   GLint RefCount;  /**< Reference count */
   GLboolean DeletePending;

   GLuint NumShaders;          /**< number of attached shaders */
   struct gl_shader **Shaders; /**< List of attached the shaders */

   /** User-defined attribute bindings (glBindAttribLocation) */
   struct gl_program_parameter_list *Attributes;

   /** Transform feedback varyings */
   struct {
      GLenum BufferMode;
      GLuint NumVarying;
      GLchar **VaryingNames;  /**< Array [NumVarying] of char * */
   } TransformFeedback;

   /** Geometry shader state - copied into gl_geometry_program at link time */
   struct {
      GLint VerticesOut;
      GLenum InputType;  /**< GL_POINTS, GL_LINES, GL_LINES_ADJACENCY_ARB,
                              GL_TRIANGLES, or GL_TRIANGLES_ADJACENCY_ARB */
      GLenum OutputType; /**< GL_POINTS, GL_LINE_STRIP or GL_TRIANGLE_STRIP */
   } Geom;

   /* post-link info: */
   struct gl_vertex_program *VertexProgram;     /**< Linked vertex program */
   struct gl_fragment_program *FragmentProgram; /**< Linked fragment prog */
   struct gl_geometry_program *GeometryProgram; /**< Linked geometry prog */
   struct gl_uniform_list *Uniforms;
   struct gl_program_parameter_list *Varying;
   GLboolean LinkStatus;   /**< GL_LINK_STATUS */
   GLboolean Validated;
   GLboolean _Used;        /**< Ever used for drawing? */
   GLchar *InfoLog;

   unsigned Version;       /**< GLSL version used for linking */

   /**
    * Per-stage shaders resulting from the first stage of linking.
    *
    * Set of linked shaders for this program.  The array is accessed using the
    * \c MESA_SHADER_* defines.  Entries for non-existent stages will be
    * \c NULL.
    */
   struct gl_shader *_LinkedShaders[MESA_SHADER_TYPES];
};   


#define GLSL_DUMP      0x1  /**< Dump shaders to stdout */
#define GLSL_LOG       0x2  /**< Write shaders to files */
#define GLSL_OPT       0x4  /**< Force optimizations (override pragmas) */
#define GLSL_NO_OPT    0x8  /**< Force no optimizations (override pragmas) */
#define GLSL_UNIFORMS 0x10  /**< Print glUniform calls */
#define GLSL_NOP_VERT 0x20  /**< Force no-op vertex shaders */
#define GLSL_NOP_FRAG 0x40  /**< Force no-op fragment shaders */
#define GLSL_USE_PROG 0x80  /**< Log glUseProgram calls */


/**
 * Context state for GLSL vertex/fragment shaders.
 */
struct gl_shader_state
{
   /**
    * Programs used for rendering
    *
    * There is a separate program set for each shader stage.  If
    * GL_EXT_separate_shader_objects is not supported, each of these must point
    * to \c NULL or to the same program.
    */
   struct gl_shader_program *CurrentVertexProgram;
   struct gl_shader_program *CurrentGeometryProgram;
   struct gl_shader_program *CurrentFragmentProgram;

   /**
    * Program used by glUniform calls.
    *
    * Explicitly set by \c glUseProgram and \c glActiveProgramEXT.
    */
   struct gl_shader_program *ActiveProgram;

   GLbitfield Flags;                    /**< Mask of GLSL_x flags */
};

/**
 * Compiler options for a single GLSL shaders type
 */
struct gl_shader_compiler_options
{
   /** Driver-selectable options: */
   GLboolean EmitCondCodes;             /**< Use condition codes? */
   GLboolean EmitNVTempInitialization;  /**< 0-fill NV temp registers */
   GLboolean EmitNoLoops;
   GLboolean EmitNoFunctions;
   GLboolean EmitNoCont;                  /**< Emit CONT opcode? */
   GLboolean EmitNoMainReturn;            /**< Emit CONT/RET opcodes? */
   GLboolean EmitNoNoise;                 /**< Emit NOISE opcodes? */
   GLboolean EmitNoPow;                   /**< Emit POW opcodes? */

   /**
    * \name Forms of indirect addressing the driver cannot do.
    */
   /*@{*/
   GLboolean EmitNoIndirectInput;   /**< No indirect addressing of inputs */
   GLboolean EmitNoIndirectOutput;  /**< No indirect addressing of outputs */
   GLboolean EmitNoIndirectTemp;    /**< No indirect addressing of temps */
   GLboolean EmitNoIndirectUniform; /**< No indirect addressing of constants */
   /*@}*/

   GLuint MaxIfDepth;               /**< Maximum nested IF blocks */
   GLuint MaxUnrollIterations;

   struct gl_sl_pragmas DefaultPragmas; /**< Default #pragma settings */
};

/**
 * Transform feedback object state
 */
struct gl_transform_feedback_object
{
   GLuint Name;  /**< AKA the object ID */
   GLint RefCount;
   GLboolean Active;  /**< Is transform feedback enabled? */
   GLboolean Paused;  /**< Is transform feedback paused? */

   /** The feedback buffers */
   GLuint BufferNames[MAX_FEEDBACK_ATTRIBS];
   struct gl_buffer_object *Buffers[MAX_FEEDBACK_ATTRIBS];

   /** Start of feedback data in dest buffer */
   GLintptr Offset[MAX_FEEDBACK_ATTRIBS];
   /** Max data to put into dest buffer (in bytes) */
   GLsizeiptr Size[MAX_FEEDBACK_ATTRIBS];
};


/**
 * Context state for transform feedback.
 */
struct gl_transform_feedback
{
   GLenum Mode;       /**< GL_POINTS, GL_LINES or GL_TRIANGLES */

   GLboolean RasterDiscard;  /**< GL_RASTERIZER_DISCARD */

   /** The general binding point (GL_TRANSFORM_FEEDBACK_BUFFER) */
   struct gl_buffer_object *CurrentBuffer;

   /** The table of all transform feedback objects */
   struct _mesa_HashTable *Objects;

   /** The current xform-fb object (GL_TRANSFORM_FEEDBACK_BINDING) */
   struct gl_transform_feedback_object *CurrentObject;

   /** The default xform-fb object (Name==0) */
   struct gl_transform_feedback_object *DefaultObject;
};



/**
 * 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 */

   /** Default texture objects (shared by all texture units) */
   struct gl_texture_object *DefaultTex[NUM_TEXTURE_TARGETS];

   /** Fallback texture used when a bound texture is incomplete */
   struct gl_texture_object *FallbackTex;

   /**
    * \name Thread safety and statechange notification for texture
    * objects. 
    *
    * \todo Improve the granularity of locking.
    */
   /*@{*/
   _glthread_Mutex TexMutex;            /**< texobj thread safety */
   GLuint TextureStateStamp;            /**< state notification for shared tex */
   /*@}*/

   /** Default buffer object for vertex arrays that aren't in VBOs */
   struct gl_buffer_object *NullBufferObj;

   /**
    * \name Vertex/geometry/fragment programs
    */
   /*@{*/
   struct _mesa_HashTable *Programs; /**< All vertex/fragment programs */
   struct gl_vertex_program *DefaultVertexProgram;
   struct gl_fragment_program *DefaultFragmentProgram;
   struct gl_geometry_program *DefaultGeometryProgram;
   /*@}*/

   /* GL_ATI_fragment_shader */
   struct _mesa_HashTable *ATIShaders;
   struct ati_fragment_shader *DefaultFragmentShader;

   struct _mesa_HashTable *BufferObjects;

   /** Table of both gl_shader and gl_shader_program objects */
   struct _mesa_HashTable *ShaderObjects;

   /* GL_EXT_framebuffer_object */
   struct _mesa_HashTable *RenderBuffers;
   struct _mesa_HashTable *FrameBuffers;

   /* GL_ARB_sync */
   struct simple_node SyncObjects;

   /** GL_ARB_sampler_objects */
   struct _mesa_HashTable *SamplerObjects;

   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;
   GLint RowStride;       /**< Padded width in units of pixels */
   GLboolean Purgeable;   /**< Is the buffer purgeable under memory pressure? */

   GLboolean AttachedAnytime; /**< TRUE if it was attached to a framebuffer */

   GLubyte NumSamples;

   GLenum InternalFormat; /**< The user-specified format */
   GLenum _BaseFormat;    /**< Either GL_RGB, GL_RGBA, GL_DEPTH_COMPONENT or
                               GL_STENCIL_INDEX. */
   gl_format Format;      /**< The actual renderbuffer memory format */

   GLenum DataType;      /**< Type of values passed to the Get/Put functions */
   GLvoid *Data;        /**< This may not be used by some kinds of RBs */

   /* 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)(struct gl_context *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)(struct gl_context *ctx, struct gl_renderbuffer *rb);
   void (*Unlock)(struct gl_context *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)(struct gl_context *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)(struct gl_context *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)(struct gl_context *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)(struct gl_context *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)(struct gl_context *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)(struct gl_context *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)(struct gl_context *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)(struct gl_context *ctx, struct gl_renderbuffer *rb,
                         GLuint count, const GLint x[], const GLint y[],
                         const void *value, const GLubyte *mask);
};


/**
 * A renderbuffer attachment 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;  /**< \c GL_NONE or \c GL_TEXTURE or \c GL_RENDERBUFFER_EXT */
   GLboolean Complete;

   /**
    * If \c Type is \c GL_RENDERBUFFER_EXT, this stores a pointer to the
    * application supplied renderbuffer object.
    */
   struct gl_renderbuffer *Renderbuffer;

   /**
    * If \c Type is \c GL_TEXTURE, this stores a pointer to the application
    * supplied texture object.
    */
   struct gl_texture_object *Texture;
   GLuint TextureLevel; /**< Attached mipmap level. */
   GLuint CubeMapFace;  /**< 0 .. 5, for cube map textures. */
   GLuint Zoffset;      /**< Slice for 3D textures,  or layer for both 1D
                         * and 2D array 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 */
   /**
    * If zero, this is a window system framebuffer.  If non-zero, this
    * is a FBO framebuffer; note that for some devices (i.e. those with
    * a natural pixel coordinate system for FBOs that differs from the
    * OpenGL/Mesa coordinate system), this means that the viewport,
    * polygon face orientation, and polygon stipple will have to be inverted.
    */
   GLuint Name;

   GLint RefCount;
   GLboolean DeletePending;

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

   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 */
   /*@}*/

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

   /** Integer color values */
   GLboolean _IntegerColor;

   /** 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;

   /** Computed from ColorDraw/ReadBuffer above */
   GLuint _NumColorDrawBuffers;
   GLint _ColorDrawBufferIndexes[MAX_DRAW_BUFFERS]; /**< BUFFER_x or -1 */
   GLint _ColorReadBufferIndex; /* -1 = None */
   struct gl_renderbuffer *_ColorDrawBuffers[MAX_DRAW_BUFFERS];
   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);
};


/**
 * Precision info for shader datatypes.  See glGetShaderPrecisionFormat().
 */
struct gl_precision
{
   GLushort RangeMin;   /**< min value exponent */
   GLushort RangeMax;   /**< max value exponent */
   GLushort Precision;  /**< number of mantissa bits */
};


/**
 * Limits for vertex, geometry and fragment programs/shaders.
 */
struct gl_program_constants
{
   /* logical limits */
   GLuint MaxInstructions;
   GLuint MaxAluInstructions;
   GLuint MaxTexInstructions;
   GLuint MaxTexIndirections;
   GLuint MaxAttribs;
   GLuint MaxTemps;
   GLuint MaxAddressRegs;
   GLuint MaxAddressOffset;  /**< [-MaxAddressOffset, MaxAddressOffset-1] */
   GLuint MaxParameters;
   GLuint MaxLocalParams;
   GLuint MaxEnvParams;
   /* native/hardware limits */
   GLuint MaxNativeInstructions;
   GLuint MaxNativeAluInstructions;
   GLuint MaxNativeTexInstructions;
   GLuint MaxNativeTexIndirections;
   GLuint MaxNativeAttribs;
   GLuint MaxNativeTemps;
   GLuint MaxNativeAddressRegs;
   GLuint MaxNativeParameters;
   /* For shaders */
   GLuint MaxUniformComponents;  /**< Usually == MaxParameters * 4 */
   /* ES 2.0 and GL_ARB_ES2_compatibility */
   struct gl_precision LowFloat, MediumFloat, HighFloat;
   struct gl_precision LowInt, MediumInt, HighInt;
};


/**
 * Constants which may be overridden by device driver during context creation
 * but are never changed after that.
 */
struct gl_constants
{
   GLint MaxTextureMbytes;      /**< Max memory per image, in MB */
   GLint MaxTextureLevels;      /**< Max mipmap levels. */ 
   GLint Max3DTextureLevels;    /**< Max mipmap levels for 3D textures */
   GLint MaxCubeTextureLevels;  /**< Max mipmap levels for cube textures */
   GLint MaxArrayTextureLayers; /**< Max layers in array textures */
   GLint MaxTextureRectSize;    /**< Max rectangle texture size, in pixes */
   GLuint MaxTextureCoordUnits;
   GLuint MaxTextureImageUnits;
   GLuint MaxVertexTextureImageUnits;
   GLuint MaxCombinedTextureImageUnits;
   GLuint MaxGeometryTextureImageUnits;
   GLuint MaxTextureUnits;           /**< = MIN(CoordUnits, ImageUnits) */
   GLfloat MaxTextureMaxAnisotropy;  /**< GL_EXT_texture_filter_anisotropic */
   GLfloat MaxTextureLodBias;        /**< GL_EXT_texture_lod_bias */
   GLuint MaxTextureBufferSize;      /**< GL_ARB_texture_buffer_object */

   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 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 */
   struct gl_program_constants GeometryProgram;  /**< GL_ARB_geometry_shader4 */
   GLuint MaxProgramMatrices;
   GLuint MaxProgramMatrixStackDepth;

   /** vertex array / buffer object bounds checking */
   GLboolean CheckArrayBounds;

   GLuint MaxDrawBuffers;    /**< GL_ARB_draw_buffers */

   GLuint MaxColorAttachments;   /**< GL_EXT_framebuffer_object */
   GLuint MaxRenderbufferSize;   /**< GL_EXT_framebuffer_object */
   GLuint MaxSamples;            /**< GL_ARB_framebuffer_object */

   /** Number of varying vectors between vertex and fragment shaders */
   GLuint MaxVarying;
   GLuint MaxVertexVaryingComponents;   /**< Between vert and geom shader */
   GLuint MaxGeometryVaryingComponents; /**< Between geom and frag shader */

   /** GL_ARB_geometry_shader4 */
   GLuint MaxGeometryOutputVertices;
   GLuint MaxGeometryTotalOutputComponents;

   GLuint GLSLVersion;  /**< GLSL version supported (ex: 120 = 1.20) */

   /**
    * Does the driver support real 32-bit integers?  (Otherwise, integers are
    * simulated via floats.)
    */
   GLboolean NativeIntegers;

   /**
    * If the driver supports real 32-bit integers, what integer value should be
    * used for boolean true in uniform uploads?  (Usually 1 or ~0.)
    */
   GLuint UniformBooleanTrue;

   /** Which texture units support GL_ATI_envmap_bumpmap as targets */
   GLbitfield SupportedBumpUnits;

   /**
    * Maximum amount of time, measured in nanseconds, that the server can wait.
    */
   GLuint64 MaxServerWaitTimeout;

   /** GL_EXT_provoking_vertex */
   GLboolean QuadsFollowProvokingVertexConvention;

   /** OpenGL version 3.0 */
   GLbitfield ContextFlags;  /**< Ex: GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT */

   /** OpenGL version 3.2 */
   GLbitfield ProfileMask;   /**< Mask of CONTEXT_x_PROFILE_BIT */

   /** GL_EXT_transform_feedback */
   GLuint MaxTransformFeedbackSeparateAttribs;
   GLuint MaxTransformFeedbackSeparateComponents;
   GLuint MaxTransformFeedbackInterleavedComponents;

   /** GL_EXT_gpu_shader4 */
   GLint MinProgramTexelOffset, MaxProgramTexelOffset;

   /* GL_EXT_framebuffer_sRGB */
   GLboolean sRGBCapable; /* can enable sRGB blend/update on FBOs */

   /* GL_ARB_robustness */
   GLenum ResetStrategy;
};


/**
 * Enable flag for each OpenGL extension.  Different device drivers will
 * enable different extensions at runtime.
 */
struct gl_extensions
{
   GLboolean dummy;  /* don't remove this! */
   GLboolean dummy_true;  /* Set true by _mesa_init_extensions(). */
   GLboolean dummy_false; /* Set false by _mesa_init_extensions(). */
   GLboolean ARB_ES2_compatibility;
   GLboolean ARB_blend_func_extended;
   GLboolean ARB_color_buffer_float;
   GLboolean ARB_copy_buffer;
   GLboolean ARB_depth_buffer_float;
   GLboolean ARB_depth_clamp;
   GLboolean ARB_depth_texture;
   GLboolean ARB_draw_buffers;
   GLboolean ARB_draw_buffers_blend;
   GLboolean ARB_draw_elements_base_vertex;
   GLboolean ARB_draw_instanced;
   GLboolean ARB_fragment_coord_conventions;
   GLboolean ARB_fragment_program;
   GLboolean ARB_fragment_program_shadow;
   GLboolean ARB_fragment_shader;
   GLboolean ARB_framebuffer_object;
   GLboolean ARB_explicit_attrib_location;
   GLboolean ARB_geometry_shader4;
   GLboolean ARB_half_float_pixel;
   GLboolean ARB_half_float_vertex;
   GLboolean ARB_instanced_arrays;
   GLboolean ARB_map_buffer_range;
   GLboolean ARB_multisample;
   GLboolean ARB_multitexture;
   GLboolean ARB_occlusion_query;
   GLboolean ARB_occlusion_query2;
   GLboolean ARB_point_sprite;
   GLboolean ARB_sampler_objects;
   GLboolean ARB_seamless_cube_map;
   GLboolean ARB_shader_objects;
   GLboolean ARB_shader_stencil_export;
   GLboolean ARB_shader_texture_lod;
   GLboolean ARB_shading_language_100;
   GLboolean ARB_shadow;
   GLboolean ARB_shadow_ambient;
   GLboolean ARB_sync;
   GLboolean ARB_texture_border_clamp;
   GLboolean ARB_texture_buffer_object;
   GLboolean ARB_texture_compression;
   GLboolean ARB_texture_compression_rgtc;
   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_multisample;
   GLboolean ARB_texture_non_power_of_two;
   GLboolean ARB_texture_rg;
   GLboolean ARB_texture_rgb10_a2ui;
   GLboolean ARB_timer_query;
   GLboolean ARB_transform_feedback2;
   GLboolean ARB_transpose_matrix;
   GLboolean ARB_uniform_buffer_object;
   GLboolean ARB_vertex_array_object;
   GLboolean ARB_vertex_buffer_object;
   GLboolean ARB_vertex_program;
   GLboolean ARB_vertex_shader;
   GLboolean ARB_vertex_type_2_10_10_10_rev;
   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_compiled_vertex_array;
   GLboolean EXT_copy_texture;
   GLboolean EXT_depth_bounds_test;
   GLboolean EXT_draw_buffers2;
   GLboolean EXT_draw_range_elements;
   GLboolean EXT_fog_coord;
   GLboolean EXT_framebuffer_blit;
   GLboolean EXT_framebuffer_multisample;
   GLboolean EXT_framebuffer_object;
   GLboolean EXT_framebuffer_sRGB;
   GLboolean EXT_gpu_program_parameters;
   GLboolean EXT_gpu_shader4;
   GLboolean EXT_multi_draw_arrays;
   GLboolean EXT_packed_depth_stencil;
   GLboolean EXT_packed_float;
   GLboolean EXT_packed_pixels;
   GLboolean EXT_pixel_buffer_object;
   GLboolean EXT_point_parameters;
   GLboolean EXT_polygon_offset;
   GLboolean EXT_provoking_vertex;
   GLboolean EXT_rescale_normal;
   GLboolean EXT_shadow_funcs;
   GLboolean EXT_secondary_color;
   GLboolean EXT_separate_shader_objects;
   GLboolean EXT_separate_specular_color;
   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_array;
   GLboolean EXT_texture_compression_latc;
   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_integer;
   GLboolean EXT_texture_lod_bias;
   GLboolean EXT_texture_mirror_clamp;
   GLboolean EXT_texture_shared_exponent;
   GLboolean EXT_texture_snorm;
   GLboolean EXT_texture_sRGB;
   GLboolean EXT_texture_sRGB_decode;
   GLboolean EXT_texture_swizzle;
   GLboolean EXT_transform_feedback;
   GLboolean EXT_timer_query;
   GLboolean EXT_vertex_array;
   GLboolean EXT_vertex_array_bgra;
   GLboolean EXT_vertex_array_set;
   GLboolean OES_standard_derivatives;
   /* vendor extensions */
   GLboolean AMD_conservative_depth;
   GLboolean AMD_seamless_cubemap_per_texture;
   GLboolean APPLE_client_storage;
   GLboolean APPLE_packed_pixels;
   GLboolean APPLE_vertex_array_object;
   GLboolean APPLE_object_purgeable;
   GLboolean ATI_envmap_bumpmap;
   GLboolean ATI_texture_compression_3dc;
   GLboolean ATI_texture_mirror_once;
   GLboolean ATI_texture_env_combine3;
   GLboolean ATI_fragment_shader;
   GLboolean ATI_separate_stencil;
   GLboolean IBM_rasterpos_clip;
   GLboolean IBM_multimode_draw_arrays;
   GLboolean MESA_pack_invert;
   GLboolean MESA_resize_buffers;
   GLboolean MESA_ycbcr_texture;
   GLboolean MESA_texture_array;
   GLboolean NV_blend_square;
   GLboolean NV_conditional_render;
   GLboolean NV_fragment_program;
   GLboolean NV_fragment_program_option;
   GLboolean NV_light_max_exponent;
   GLboolean NV_point_sprite;
   GLboolean NV_primitive_restart;
   GLboolean NV_texture_barrier;
   GLboolean NV_texgen_reflection;
   GLboolean NV_texture_env_combine4;
   GLboolean NV_texture_rectangle;
   GLboolean NV_vertex_program;
   GLboolean NV_vertex_program1_1;
   GLboolean OES_read_format;
   GLboolean SGIS_generate_mipmap;
   GLboolean SGIS_texture_edge_clamp;
   GLboolean SGIS_texture_lod;
   GLboolean TDFX_texture_compression_FXT1;
   GLboolean S3_s3tc;
   GLboolean OES_EGL_image;
   GLboolean OES_draw_texture;
   GLboolean EXT_texture_format_BGRA8888;
   GLboolean extension_sentinel;
   /** The extension string */
   const GLubyte *String;
   /** Number of supported extensions */
   GLuint Count;
};


/**
 * A stack of matrices (projection, modelview, color, texture, etc).
 */
struct gl_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 __struct gl_contextRec::ImageTransferState.
 */
/*@{*/
#define IMAGE_SCALE_BIAS_BIT                      0x1
#define IMAGE_SHIFT_OFFSET_BIT                    0x2
#define IMAGE_MAP_COLOR_BIT                       0x4
#define IMAGE_CLAMP_BIT                           0x800


/** Pixel Transfer ops */
#define IMAGE_BITS (IMAGE_SCALE_BIAS_BIT |                      \
                    IMAGE_SHIFT_OFFSET_BIT |                    \
                    IMAGE_MAP_COLOR_BIT)

/**
 * \name Bits to indicate what state has changed.  
 */
/*@{*/
#define _NEW_MODELVIEW         (1 << 0)   /**< gl_context::ModelView */
#define _NEW_PROJECTION        (1 << 1)   /**< gl_context::Projection */
#define _NEW_TEXTURE_MATRIX    (1 << 2)   /**< gl_context::TextureMatrix */
#define _NEW_COLOR             (1 << 3)   /**< gl_context::Color */
#define _NEW_DEPTH             (1 << 4)   /**< gl_context::Depth */
#define _NEW_EVAL              (1 << 5)   /**< gl_context::Eval, EvalMap */
#define _NEW_FOG               (1 << 6)   /**< gl_context::Fog */
#define _NEW_HINT              (1 << 7)   /**< gl_context::Hint */
#define _NEW_LIGHT             (1 << 8)   /**< gl_context::Light */
#define _NEW_LINE              (1 << 9)   /**< gl_context::Line */
#define _NEW_PIXEL             (1 << 10)  /**< gl_context::Pixel */
#define _NEW_POINT             (1 << 11)  /**< gl_context::Point */
#define _NEW_POLYGON           (1 << 12)  /**< gl_context::Polygon */
#define _NEW_POLYGONSTIPPLE    (1 << 13)  /**< gl_context::PolygonStipple */
#define _NEW_SCISSOR           (1 << 14)  /**< gl_context::Scissor */
#define _NEW_STENCIL           (1 << 15)  /**< gl_context::Stencil */
#define _NEW_TEXTURE           (1 << 16)  /**< gl_context::Texture */
#define _NEW_TRANSFORM         (1 << 17)  /**< gl_context::Transform */
#define _NEW_VIEWPORT          (1 << 18)  /**< gl_context::Viewport */
#define _NEW_PACKUNPACK        (1 << 19)  /**< gl_context::Pack, Unpack */
#define _NEW_ARRAY             (1 << 20)  /**< gl_context::Array */
#define _NEW_RENDERMODE        (1 << 21)  /**< gl_context::RenderMode, etc */
#define _NEW_BUFFERS           (1 << 22)  /**< gl_context::Visual, DrawBuffer, */
#define _NEW_CURRENT_ATTRIB    (1 << 23)  /**< gl_context::Current */
#define _NEW_MULTISAMPLE       (1 << 24)  /**< gl_context::Multisample */
#define _NEW_TRACK_MATRIX      (1 << 25)  /**< gl_context::VertexProgram */
#define _NEW_PROGRAM           (1 << 26)  /**< New program/shader state */
#define _NEW_PROGRAM_CONSTANTS (1 << 27)
#define _NEW_BUFFER_OBJECT     (1 << 28)
#define _NEW_FRAG_CLAMP        (1 << 29)
#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_EDGEFLAG
#define _NEW_ARRAY_POINT_SIZE       VERT_BIT_COLOR_INDEX  /* aliased */
#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         VERT_BIT_GENERIC0  /* 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 __struct gl_contextRec::_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_POINT_SMOOTH             0x400
#define DD_POINT_ATTEN              0x800
#define DD_TRI_TWOSTENCIL           0x1000
/*@}*/


/**
 * \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
/*@}*/


/**
 * Composite state flags
 */
/*@{*/
#define _MESA_NEW_NEED_EYE_COORDS         (_NEW_LIGHT |         \
                                           _NEW_TEXTURE |       \
                                           _NEW_POINT |         \
                                           _NEW_PROGRAM |       \
                                           _NEW_MODELVIEW)
/*@}*/




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


/**
 * Display list flags.
 * 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 DLIST_DANGLING_REFS     0x1 


/** Opaque declaration of display list payload data type */
union gl_dlist_node;


/**
 * Provide a location where information about a display list can be
 * collected.  Could be extended with driverPrivate structures,
 * etc. in the future.
 */
struct gl_display_list
{
   GLuint Name;
   GLbitfield Flags;  /**< DLIST_x flags */
   /** The dlist commands are in a linked list of nodes */
   union gl_dlist_node *Head;
};


/**
 * State used during display list compilation and execution.
 */
struct gl_dlist_state
{
   GLuint CallDepth;            /**< Current recursion calling depth */

   struct gl_display_list *CurrentList; /**< List currently being compiled */
   union gl_dlist_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;

   struct {
      /* State known to have been set by the currently-compiling display
       * list.  Used to eliminate some redundant state changes.
       */
      GLenum ShadeModel;
   } Current;
};


/**
 * Enum for the OpenGL APIs we know about and may support.
 */
typedef enum
{
   API_OPENGL,
   API_OPENGLES,
   API_OPENGLES2
} gl_api;


/**
 * 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 struct gl_context typedef names this structure.
 */
struct gl_context
{
   /** State possibly shared with other contexts in the address space */
   struct gl_shared_state *Shared;

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

   struct gl_config Visual;
   struct gl_framebuffer *DrawBuffer;   /**< buffer for writing */
   struct gl_framebuffer *ReadBuffer;   /**< buffer for reading */
   struct gl_framebuffer *WinSysDrawBuffer;  /**< set with MakeCurrent */
   struct gl_framebuffer *WinSysReadBuffer;  /**< set with MakeCurrent */

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

   void *DriverCtx;     /**< Points to device driver context/state */

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

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

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

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

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

   /** Extension information */
   struct gl_extensions Extensions;

   /** Version info */
   GLuint VersionMajor, VersionMinor;
   char *VersionString;

   /** \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_pixelmaps          PixelMaps;

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

   struct gl_program_state Program;  /**< general program state */
   struct gl_vertex_program_state VertexProgram;
   struct gl_fragment_program_state FragmentProgram;
   struct gl_geometry_program_state GeometryProgram;
   struct gl_ati_fragment_shader_state ATIFragmentShader;

   struct gl_shader_state Shader; /**< GLSL shader object state */
   struct gl_shader_compiler_options ShaderCompilerOptions[MESA_SHADER_TYPES];

   struct gl_query_state Query;  /**< occlusion, timer queries */

   struct gl_transform_feedback TransformFeedback;

   struct gl_buffer_object *CopyReadBuffer; /**< GL_ARB_copy_buffer */
   struct gl_buffer_object *CopyWriteBuffer; /**< GL_ARB_copy_buffer */
   /*@}*/

   struct gl_meta_state *Meta;  /**< for "meta" operations */

   /* GL_EXT_framebuffer_object */
   struct gl_renderbuffer *CurrentRenderbuffer;

   GLenum ErrorValue;        /**< Last error code */

   /* GL_ARB_robustness */
   GLenum ResetStatus;

   /**
    * Recognize and silence repeated error debug messages in buggy apps.
    */
   const char *ErrorDebugFmtString;
   GLuint ErrorDebugCount;

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

   GLboolean ViewportInitialized;  /**< has viewport size been initialized? */

   GLbitfield varying_vp_inputs;  /**< mask of VERT_BIT_* flags */

   /** \name Derived state */
   /*@{*/
   /** Bitwise-or of DD_* flags.  Note that this bitfield may be used before
    * state validation so they need to always be current.
    */
   GLbitfield _TriangleCaps;
   GLbitfield _ImageTransferState;/**< bitwise-or of IMAGE_*_BIT flags */
   GLfloat _EyeZDir[3];
   GLfloat _ModelViewInvScale;
   GLboolean _NeedEyeCoords;
   GLboolean _ForceEyeCoords; 

   GLuint TextureStateTimestamp; /**< detect changes to shared state */

   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 */

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

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

   GLboolean TextureFormatSupported[MESA_FORMAT_COUNT];

   /** 
    * Use dp4 (rather than mul/mad) instructions for position
    * transformation?
    */
   GLboolean mvp_with_dp4;

   /**
    * \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;
   struct st_context *st;
   void *aelt_context;
   /*@}*/
};


#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


/** The MESA_VERBOSE var is a bitmask of these flags */
enum _verbose
{
   VERBOSE_VARRAY               = 0x0001,
   VERBOSE_TEXTURE              = 0x0002,
   VERBOSE_MATERIAL             = 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,
   VERBOSE_DRAW                 = 0x2000,
   VERBOSE_SWAPBUFFERS          = 0x4000
};


/** The MESA_DEBUG_FLAGS var is a bitmask of these flags */
enum _debug
{
   DEBUG_ALWAYS_FLUSH           = 0x1
};



#endif /* MTYPES_H */