Mesa git update 7 Mar 2011

1 files changed, 824 insertions, 821 deletions

diff --git a/mesalib/src/mesa/drivers/dri/common/utils.c b/mesalib/src/mesa/drivers/dri/common/utils.c
index a2b0b4e94..083edfaa9 100644
--- a/mesalib/src/mesa/drivers/dri/common/utils.c
+++ b/mesalib/src/mesa/drivers/dri/common/utils.c
@@ -1,821 +1,824 @@
-/*

- * (C) Copyright IBM Corporation 2002, 2004

- * 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

- * on the rights to use, copy, modify, merge, publish, distribute, sub

- * license, 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 (including the next

- * paragraph) 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 NON-INFRINGEMENT.  IN NO EVENT SHALL

- * VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS 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 utils.c

- * Utility functions for DRI drivers.

- *

- * \author Ian Romanick <idr@us.ibm.com>

- */

-

-#include <string.h>

-#include <stdlib.h>

-#include "main/mtypes.h"

-#include "main/cpuinfo.h"

-#include "main/extensions.h"

-#include "utils.h"

-

-

-/**

- * Print message to \c stderr if the \c LIBGL_DEBUG environment variable

- * is set. 

- * 

- * Is called from the drivers.

- * 

- * \param f \c printf like format string.

- */

-void

-__driUtilMessage(const char *f, ...)

-{

-    va_list args;

-

-    if (getenv("LIBGL_DEBUG")) {

-        fprintf(stderr, "libGL: ");

-        va_start(args, f);

-        vfprintf(stderr, f, args);

-        va_end(args);

-        fprintf(stderr, "\n");

-    }

-}

-

-

-unsigned

-driParseDebugString( const char * debug, 

-		     const struct dri_debug_control * control  )

-{

-   unsigned   flag;

-

-

-   flag = 0;

-   if ( debug != NULL ) {

-      while( control->string != NULL ) {

-	 if ( !strcmp( debug, "all" ) ||

-	      strstr( debug, control->string ) != NULL ) {

-	    flag |= control->flag;

-	 }

-

-	 control++;

-      }

-   }

-

-   return flag;

-}

-

-

-

-/**

- * Create the \c GL_RENDERER string for DRI drivers.

- * 

- * Almost all DRI drivers use a \c GL_RENDERER string of the form:

- *

- *    "Mesa DRI <chip> <driver date> <AGP speed) <CPU information>"

- *

- * Using the supplied chip name, driver data, and AGP speed, this function

- * creates the string.

- * 

- * \param buffer         Buffer to hold the \c GL_RENDERER string.

- * \param hardware_name  Name of the hardware.

- * \param driver_date    Driver date.

- * \param agp_mode       AGP mode (speed).

- * 

- * \returns

- * The length of the string stored in \c buffer.  This does \b not include

- * the terminating \c NUL character.

- */

-unsigned

-driGetRendererString( char * buffer, const char * hardware_name,

-		      const char * driver_date, GLuint agp_mode )

-{

-   unsigned offset;

-   char *cpu;

-

-   offset = sprintf( buffer, "Mesa DRI %s %s", hardware_name, driver_date );

-

-   /* Append any AGP-specific information.

-    */

-   switch ( agp_mode ) {

-   case 1:

-   case 2:

-   case 4:

-   case 8:

-      offset += sprintf( & buffer[ offset ], " AGP %ux", agp_mode );

-      break;

-	

-   default:

-      break;

-   }

-

-   /* Append any CPU-specific information.

-    */

-   cpu = _mesa_get_cpu_string();

-   if (cpu) {

-      offset += sprintf(buffer + offset, " %s", cpu);

-      free(cpu);

-   }

-

-   return offset;

-}

-

-

-

-

-#define need_GL_ARB_copy_buffer

-#define need_GL_ARB_draw_buffers

-#define need_GL_ARB_multisample

-#define need_GL_ARB_texture_compression

-#define need_GL_ARB_transpose_matrix

-#define need_GL_ARB_vertex_buffer_object

-#define need_GL_ARB_window_pos

-#define need_GL_EXT_compiled_vertex_array

-#define need_GL_EXT_multi_draw_arrays

-#define need_GL_EXT_polygon_offset

-#define need_GL_EXT_texture_object

-#define need_GL_EXT_vertex_array

-#define need_GL_IBM_multimode_draw_arrays

-#define need_GL_MESA_window_pos

-

-/* These are needed in *all* drivers because Mesa internally implements

- * certain functionality in terms of functions provided by these extensions.

- * For example, glBlendFunc is implemented by calling glBlendFuncSeparateEXT.

- */

-#define need_GL_EXT_blend_func_separate

-#define need_GL_NV_vertex_program

-

-#include "main/remap_helper.h"

-

-static const struct dri_extension all_mesa_extensions[] = {

-   { "GL_ARB_copy_buffer",           GL_ARB_copy_buffer_functions },

-   { "GL_ARB_draw_buffers",          GL_ARB_draw_buffers_functions },

-   { "GL_ARB_multisample",           GL_ARB_multisample_functions },

-   { "GL_ARB_texture_compression",   GL_ARB_texture_compression_functions },

-   { "GL_ARB_transpose_matrix",      GL_ARB_transpose_matrix_functions },

-   { "GL_ARB_vertex_buffer_object",  GL_ARB_vertex_buffer_object_functions},

-   { "GL_ARB_window_pos",            GL_ARB_window_pos_functions },

-   { "GL_EXT_blend_func_separate",   GL_EXT_blend_func_separate_functions },

-   { "GL_EXT_compiled_vertex_array", GL_EXT_compiled_vertex_array_functions },

-   { "GL_EXT_multi_draw_arrays",     GL_EXT_multi_draw_arrays_functions },

-   { "GL_EXT_polygon_offset",        GL_EXT_polygon_offset_functions },

-   { "GL_EXT_texture_object",        GL_EXT_texture_object_functions },

-   { "GL_EXT_vertex_array",          GL_EXT_vertex_array_functions },

-   { "GL_IBM_multimode_draw_arrays", GL_IBM_multimode_draw_arrays_functions },

-   { "GL_MESA_window_pos",           GL_MESA_window_pos_functions },

-   { "GL_NV_vertex_program",         GL_NV_vertex_program_functions },

-   { NULL,                           NULL }

-};

-

-

-/**

- * Enable and map extensions supported by the driver.

- * 

- * When ctx is NULL, extensions are not enabled, but their functions

- * are still mapped.  When extensions_to_enable is NULL, all static

- * functions known to mesa core are mapped.

- *

- * \bug

- * ARB_imaging isn't handled properly.  In Mesa, enabling ARB_imaging also

- * enables all the sub-extensions that are folded into it.  This means that

- * we need to add entry-points (via \c driInitSingleExtension) for those

- * new functions here.

- */

-void driInitExtensions( struct gl_context * ctx,

-			const struct dri_extension * extensions_to_enable,

-			GLboolean enable_imaging )

-{

-   static int first_time = 1;

-   unsigned   i;

-

-   if ( first_time ) {

-      first_time = 0;

-      driInitExtensions( NULL, all_mesa_extensions, GL_FALSE );

-   }

-

-   if ( (ctx != NULL) && enable_imaging ) {

-      _mesa_enable_imaging_extensions( ctx );

-   }

-

-   /* The caller is too lazy to list any extension */

-   if ( extensions_to_enable == NULL ) {

-      /* Map the static functions.  Together with those mapped by remap

-       * table, this should cover everything mesa core knows.

-       */

-      _mesa_map_static_functions();

-      return;

-   }

-

-   for ( i = 0 ; extensions_to_enable[i].name != NULL ; i++ ) {

-       driInitSingleExtension( ctx, & extensions_to_enable[i] );

-   }

-}

-

-

-

-

-/**

- * Enable and map functions for a single extension

- * 

- * \param ctx  Context where extension is to be enabled.

- * \param ext  Extension that is to be enabled.

- * 

- * \sa driInitExtensions, _mesa_enable_extension, _mesa_map_function_array

- */

-void driInitSingleExtension( struct gl_context * ctx,

-			     const struct dri_extension * ext )

-{

-    if ( ext->functions != NULL ) {

-       _mesa_map_function_array(ext->functions);

-    }

-

-    if ( ctx != NULL ) {

-	_mesa_enable_extension( ctx, ext->name );

-    }

-}

-

-

-/**

- * Utility function used by drivers to test the verions of other components.

- *

- * \param driver_name  Name of the driver.  Used in error messages.

- * \param driActual    Actual DRI version supplied __driCreateNewScreen.

- * \param driExpected  Minimum DRI version required by the driver.

- * \param ddxActual    Actual DDX version supplied __driCreateNewScreen.

- * \param ddxExpected  Minimum DDX minor and range of DDX major version required by the driver.

- * \param drmActual    Actual DRM version supplied __driCreateNewScreen.

- * \param drmExpected  Minimum DRM version required by the driver.

- * 

- * \returns \c GL_TRUE if all version requirements are met.  Otherwise,

- *          \c GL_FALSE is returned.

- * 

- * \sa __driCreateNewScreen, driCheckDriDdxDrmVersions2

- *

- * \todo

- * Now that the old \c driCheckDriDdxDrmVersions function is gone, this

- * function and \c driCheckDriDdxDrmVersions2 should be renamed.

- */

-GLboolean

-driCheckDriDdxDrmVersions3(const char * driver_name,

-			   const __DRIversion * driActual,

-			   const __DRIversion * driExpected,

-			   const __DRIversion * ddxActual,

-			   const __DRIutilversion2 * ddxExpected,

-			   const __DRIversion * drmActual,

-			   const __DRIversion * drmExpected)

-{

-   static const char format[] = "%s DRI driver expected %s version %d.%d.x "

-       "but got version %d.%d.%d\n";

-   static const char format2[] = "%s DRI driver expected %s version %d-%d.%d.x "

-       "but got version %d.%d.%d\n";

-

-

-   /* Check the DRI version */

-   if ( (driActual->major != driExpected->major)

-	|| (driActual->minor < driExpected->minor) ) {

-      fprintf(stderr, format, driver_name, "DRI",

-		       driExpected->major, driExpected->minor,

-		       driActual->major, driActual->minor, driActual->patch);

-      return GL_FALSE;

-   }

-

-   /* Check that the DDX driver version is compatible */

-   if ( (ddxActual->major < ddxExpected->major_min)

-	|| (ddxActual->major > ddxExpected->major_max)

-	|| (ddxActual->minor < ddxExpected->minor) ) {

-      fprintf(stderr, format2, driver_name, "DDX",

-		       ddxExpected->major_min, ddxExpected->major_max, ddxExpected->minor,

-		       ddxActual->major, ddxActual->minor, ddxActual->patch);

-      return GL_FALSE;

-   }

-   

-   /* Check that the DRM driver version is compatible */

-   if ( (drmActual->major != drmExpected->major)

-	|| (drmActual->minor < drmExpected->minor) ) {

-      fprintf(stderr, format, driver_name, "DRM",

-		       drmExpected->major, drmExpected->minor,

-		       drmActual->major, drmActual->minor, drmActual->patch);

-      return GL_FALSE;

-   }

-

-   return GL_TRUE;

-}

-

-GLboolean

-driCheckDriDdxDrmVersions2(const char * driver_name,

-			   const __DRIversion * driActual,

-			   const __DRIversion * driExpected,

-			   const __DRIversion * ddxActual,

-			   const __DRIversion * ddxExpected,

-			   const __DRIversion * drmActual,

-			   const __DRIversion * drmExpected)

-{

-   __DRIutilversion2 ddx_expected;

-   ddx_expected.major_min = ddxExpected->major;

-   ddx_expected.major_max = ddxExpected->major;

-   ddx_expected.minor = ddxExpected->minor;

-   ddx_expected.patch = ddxExpected->patch;

-   return driCheckDriDdxDrmVersions3(driver_name, driActual,

-				driExpected, ddxActual, & ddx_expected,

-				drmActual, drmExpected);

-}

-

-GLboolean driClipRectToFramebuffer( const struct gl_framebuffer *buffer,

-				    GLint *x, GLint *y,

-				    GLsizei *width, GLsizei *height )

-{

-   /* left clipping */

-   if (*x < buffer->_Xmin) {

-      *width -= (buffer->_Xmin - *x);

-      *x = buffer->_Xmin;

-   }

-

-   /* right clipping */

-   if (*x + *width > buffer->_Xmax)

-      *width -= (*x + *width - buffer->_Xmax - 1);

-

-   if (*width <= 0)

-      return GL_FALSE;

-

-   /* bottom clipping */

-   if (*y < buffer->_Ymin) {

-      *height -= (buffer->_Ymin - *y);

-      *y = buffer->_Ymin;

-   }

-

-   /* top clipping */

-   if (*y + *height > buffer->_Ymax)

-      *height -= (*y + *height - buffer->_Ymax - 1);

-

-   if (*height <= 0)

-      return GL_FALSE;

-

-   return GL_TRUE;

-}

-

-/**

- * Creates a set of \c struct gl_config that a driver will expose.

- * 

- * A set of \c struct gl_config will be created based on the supplied

- * parameters.  The number of modes processed will be 2 *

- * \c num_depth_stencil_bits * \c num_db_modes.

- * 

- * For the most part, data is just copied from \c depth_bits, \c stencil_bits,

- * \c db_modes, and \c visType into each \c struct gl_config element.

- * However, the meanings of \c fb_format and \c fb_type require further

- * explanation.  The \c fb_format specifies which color components are in

- * each pixel and what the default order is.  For example, \c GL_RGB specifies

- * that red, green, blue are available and red is in the "most significant"

- * position and blue is in the "least significant".  The \c fb_type specifies

- * the bit sizes of each component and the actual ordering.  For example, if

- * \c GL_UNSIGNED_SHORT_5_6_5_REV is specified with \c GL_RGB, bits [15:11]

- * are the blue value, bits [10:5] are the green value, and bits [4:0] are

- * the red value.

- * 

- * One sublte issue is the combination of \c GL_RGB  or \c GL_BGR and either

- * of the \c GL_UNSIGNED_INT_8_8_8_8 modes.  The resulting mask values in the

- * \c struct gl_config structure is \b identical to the \c GL_RGBA or

- * \c GL_BGRA case, except the \c alphaMask is zero.  This means that, as

- * far as this routine is concerned, \c GL_RGB with \c GL_UNSIGNED_INT_8_8_8_8

- * still uses 32-bits.

- *

- * If in doubt, look at the tables used in the function.

- * 

- * \param ptr_to_modes  Pointer to a pointer to a linked list of

- *                      \c struct gl_config.  Upon completion, a pointer to

- *                      the next element to be process will be stored here.

- *                      If the function fails and returns \c GL_FALSE, this

- *                      value will be unmodified, but some elements in the

- *                      linked list may be modified.

- * \param fb_format     Format of the framebuffer.  Currently only \c GL_RGB,

- *                      \c GL_RGBA, \c GL_BGR, and \c GL_BGRA are supported.

- * \param fb_type       Type of the pixels in the framebuffer.  Currently only

- *                      \c GL_UNSIGNED_SHORT_5_6_5, 

- *                      \c GL_UNSIGNED_SHORT_5_6_5_REV,

- *                      \c GL_UNSIGNED_INT_8_8_8_8, and

- *                      \c GL_UNSIGNED_INT_8_8_8_8_REV are supported.

- * \param depth_bits    Array of depth buffer sizes to be exposed.

- * \param stencil_bits  Array of stencil buffer sizes to be exposed.

- * \param num_depth_stencil_bits  Number of entries in both \c depth_bits and

- *                      \c stencil_bits.

- * \param db_modes      Array of buffer swap modes.  If an element has a

- *                      value of \c GLX_NONE, then it represents a

- *                      single-buffered mode.  Other valid values are

- *                      \c GLX_SWAP_EXCHANGE_OML, \c GLX_SWAP_COPY_OML, and

- *                      \c GLX_SWAP_UNDEFINED_OML.  See the

- *                      GLX_OML_swap_method extension spec for more details.

- * \param num_db_modes  Number of entries in \c db_modes.

- * \param msaa_samples  Array of msaa sample count. 0 represents a visual

- *                      without a multisample buffer.

- * \param num_msaa_modes Number of entries in \c msaa_samples.

- * \param visType       GLX visual type.  Usually either \c GLX_TRUE_COLOR or

- *                      \c GLX_DIRECT_COLOR.

- * 

- * \returns

- * \c GL_TRUE on success or \c GL_FALSE on failure.  Currently the only

- * cause of failure is a bad parameter (i.e., unsupported \c fb_format or

- * \c fb_type).

- * 

- * \todo

- * There is currently no way to support packed RGB modes (i.e., modes with

- * exactly 3 bytes per pixel) or floating-point modes.  This could probably

- * be done by creating some new, private enums with clever names likes

- * \c GL_UNSIGNED_3BYTE_8_8_8, \c GL_4FLOAT_32_32_32_32, 

- * \c GL_4HALF_16_16_16_16, etc.  We can cross that bridge when we come to it.

- */

-__DRIconfig **

-driCreateConfigs(GLenum fb_format, GLenum fb_type,

-		 const uint8_t * depth_bits, const uint8_t * stencil_bits,

-		 unsigned num_depth_stencil_bits,

-		 const GLenum * db_modes, unsigned num_db_modes,

-		 const uint8_t * msaa_samples, unsigned num_msaa_modes,

-		 GLboolean enable_accum)

-{

-   static const uint8_t bits_table[4][4] = {

-     /* R  G  B  A */

-      { 3, 3, 2, 0 }, /* Any GL_UNSIGNED_BYTE_3_3_2 */

-      { 5, 6, 5, 0 }, /* Any GL_UNSIGNED_SHORT_5_6_5 */

-      { 8, 8, 8, 0 }, /* Any RGB with any GL_UNSIGNED_INT_8_8_8_8 */

-      { 8, 8, 8, 8 }  /* Any RGBA with any GL_UNSIGNED_INT_8_8_8_8 */

-   };

-

-   static const uint32_t masks_table_rgb[6][4] = {

-      { 0x000000E0, 0x0000001C, 0x00000003, 0x00000000 }, /* 3_3_2       */

-      { 0x00000007, 0x00000038, 0x000000C0, 0x00000000 }, /* 2_3_3_REV   */

-      { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5       */

-      { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5_REV   */

-      { 0xFF000000, 0x00FF0000, 0x0000FF00, 0x00000000 }, /* 8_8_8_8     */

-      { 0x000000FF, 0x0000FF00, 0x00FF0000, 0x00000000 }  /* 8_8_8_8_REV */

-   };

-

-   static const uint32_t masks_table_rgba[6][4] = {

-      { 0x000000E0, 0x0000001C, 0x00000003, 0x00000000 }, /* 3_3_2       */

-      { 0x00000007, 0x00000038, 0x000000C0, 0x00000000 }, /* 2_3_3_REV   */

-      { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5       */

-      { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5_REV   */

-      { 0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF }, /* 8_8_8_8     */

-      { 0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000 }, /* 8_8_8_8_REV */

-   };

-

-   static const uint32_t masks_table_bgr[6][4] = {

-      { 0x00000007, 0x00000038, 0x000000C0, 0x00000000 }, /* 3_3_2       */

-      { 0x000000E0, 0x0000001C, 0x00000003, 0x00000000 }, /* 2_3_3_REV   */

-      { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5       */

-      { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5_REV   */

-      { 0x0000FF00, 0x00FF0000, 0xFF000000, 0x00000000 }, /* 8_8_8_8     */

-      { 0x00FF0000, 0x0000FF00, 0x000000FF, 0x00000000 }, /* 8_8_8_8_REV */

-   };

-

-   static const uint32_t masks_table_bgra[6][4] = {

-      { 0x00000007, 0x00000038, 0x000000C0, 0x00000000 }, /* 3_3_2       */

-      { 0x000000E0, 0x0000001C, 0x00000003, 0x00000000 }, /* 2_3_3_REV   */

-      { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5       */

-      { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5_REV   */

-      { 0x0000FF00, 0x00FF0000, 0xFF000000, 0x000000FF }, /* 8_8_8_8     */

-      { 0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000 }, /* 8_8_8_8_REV */

-   };

-

-   static const uint8_t bytes_per_pixel[6] = {

-      1, /* 3_3_2       */

-      1, /* 2_3_3_REV   */

-      2, /* 5_6_5       */

-      2, /* 5_6_5_REV   */

-      4, /* 8_8_8_8     */

-      4  /* 8_8_8_8_REV */

-   };

-

-   const uint8_t  * bits;

-   const uint32_t * masks;

-   int index;

-   __DRIconfig **configs, **c;

-   struct gl_config *modes;

-   unsigned i, j, k, h;

-   unsigned num_modes;

-   unsigned num_accum_bits = (enable_accum) ? 2 : 1;

-

-   switch ( fb_type ) {

-      case GL_UNSIGNED_BYTE_3_3_2:

-	 index = 0;

-	 break;

-      case GL_UNSIGNED_BYTE_2_3_3_REV:

-	 index = 1;

-	 break;

-      case GL_UNSIGNED_SHORT_5_6_5:

-	 index = 2;

-	 break;

-      case GL_UNSIGNED_SHORT_5_6_5_REV:

-	 index = 3;

-	 break;

-      case GL_UNSIGNED_INT_8_8_8_8:

-	 index = 4;

-	 break;

-      case GL_UNSIGNED_INT_8_8_8_8_REV:

-	 index = 5;

-	 break;

-      default:

-	 fprintf( stderr, "[%s:%u] Unknown framebuffer type 0x%04x.\n",

-               __FUNCTION__, __LINE__, fb_type );

-	 return NULL;

-   }

-

-

-   /* Valid types are GL_UNSIGNED_SHORT_5_6_5 and GL_UNSIGNED_INT_8_8_8_8 and

-    * the _REV versions.

-    *

-    * Valid formats are GL_RGBA, GL_RGB, and GL_BGRA.

-    */

-

-   switch ( fb_format ) {

-      case GL_RGB:

-         masks = masks_table_rgb[ index ];

-         break;

-

-      case GL_RGBA:

-         masks = masks_table_rgba[ index ];

-         break;

-

-      case GL_BGR:

-         masks = masks_table_bgr[ index ];

-         break;

-

-      case GL_BGRA:

-         masks = masks_table_bgra[ index ];

-         break;

-

-      default:

-         fprintf( stderr, "[%s:%u] Unknown framebuffer format 0x%04x.\n",

-               __FUNCTION__, __LINE__, fb_format );

-         return NULL;

-   }

-

-   switch ( bytes_per_pixel[ index ] ) {

-      case 1:

-	 bits = bits_table[0];

-	 break;

-      case 2:

-	 bits = bits_table[1];

-	 break;

-      default:

-	 bits = ((fb_format == GL_RGB) || (fb_format == GL_BGR))

-	    ? bits_table[2]

-	    : bits_table[3];

-	 break;

-   }

-

-   num_modes = num_depth_stencil_bits * num_db_modes * num_accum_bits * num_msaa_modes;

-   configs = calloc(1, (num_modes + 1) * sizeof *configs);

-   if (configs == NULL)

-       return NULL;

-

-    c = configs;

-    for ( k = 0 ; k < num_depth_stencil_bits ; k++ ) {

-	for ( i = 0 ; i < num_db_modes ; i++ ) {

-	    for ( h = 0 ; h < num_msaa_modes; h++ ) {

-	    	for ( j = 0 ; j < num_accum_bits ; j++ ) {

-		    *c = malloc (sizeof **c);

-		    modes = &(*c)->modes;

-		    c++;

-

-		    memset(modes, 0, sizeof *modes);

-		    modes->redBits   = bits[0];

-		    modes->greenBits = bits[1];

-		    modes->blueBits  = bits[2];

-		    modes->alphaBits = bits[3];

-		    modes->redMask   = masks[0];

-		    modes->greenMask = masks[1];

-		    modes->blueMask  = masks[2];

-		    modes->alphaMask = masks[3];

-		    modes->rgbBits   = modes->redBits + modes->greenBits

-		    	+ modes->blueBits + modes->alphaBits;

-

-		    modes->accumRedBits   = 16 * j;

-		    modes->accumGreenBits = 16 * j;

-		    modes->accumBlueBits  = 16 * j;

-		    modes->accumAlphaBits = (masks[3] != 0) ? 16 * j : 0;

-		    modes->visualRating = (j == 0) ? GLX_NONE : GLX_SLOW_CONFIG;

-

-		    modes->stencilBits = stencil_bits[k];

-		    modes->depthBits = depth_bits[k];

-

-		    modes->transparentPixel = GLX_NONE;

-		    modes->transparentRed = GLX_DONT_CARE;

-		    modes->transparentGreen = GLX_DONT_CARE;

-		    modes->transparentBlue = GLX_DONT_CARE;

-		    modes->transparentAlpha = GLX_DONT_CARE;

-		    modes->transparentIndex = GLX_DONT_CARE;

-		    modes->rgbMode = GL_TRUE;

-

-		    if ( db_modes[i] == GLX_NONE ) {

-		    	modes->doubleBufferMode = GL_FALSE;

-		    }

-		    else {

-		    	modes->doubleBufferMode = GL_TRUE;

-		    	modes->swapMethod = db_modes[i];

-		    }

-

-		    modes->samples = msaa_samples[h];

-		    modes->sampleBuffers = modes->samples ? 1 : 0;

-

-

-		    modes->haveAccumBuffer = ((modes->accumRedBits +

-					   modes->accumGreenBits +

-					   modes->accumBlueBits +

-					   modes->accumAlphaBits) > 0);

-		    modes->haveDepthBuffer = (modes->depthBits > 0);

-		    modes->haveStencilBuffer = (modes->stencilBits > 0);

-

-		    modes->bindToTextureRgb = GL_TRUE;

-		    modes->bindToTextureRgba = GL_TRUE;

-		    modes->bindToMipmapTexture = GL_FALSE;

-		    modes->bindToTextureTargets =

-			__DRI_ATTRIB_TEXTURE_1D_BIT |

-			__DRI_ATTRIB_TEXTURE_2D_BIT |

-			__DRI_ATTRIB_TEXTURE_RECTANGLE_BIT;

-		}

-	    }

-	}

-    }

-    *c = NULL;

-

-    return configs;

-}

-

-__DRIconfig **driConcatConfigs(__DRIconfig **a,

-			       __DRIconfig **b)

-{

-    __DRIconfig **all;

-    int i, j, index;

-

-    i = 0;

-    while (a[i] != NULL)

-	i++;

-    j = 0;

-    while (b[j] != NULL)

-	j++;

-   

-    all = malloc((i + j + 1) * sizeof *all);

-    index = 0;

-    for (i = 0; a[i] != NULL; i++)

-	all[index++] = a[i];

-    for (j = 0; b[j] != NULL; j++)

-	all[index++] = b[j];

-    all[index++] = NULL;

-

-    free(a);

-    free(b);

-

-    return all;

-}

-

-#define __ATTRIB(attrib, field) \

-    { attrib, offsetof(struct gl_config, field) }

-

-static const struct { unsigned int attrib, offset; } attribMap[] = {

-    __ATTRIB(__DRI_ATTRIB_BUFFER_SIZE,			rgbBits),

-    __ATTRIB(__DRI_ATTRIB_LEVEL,			level),

-    __ATTRIB(__DRI_ATTRIB_RED_SIZE,			redBits),

-    __ATTRIB(__DRI_ATTRIB_GREEN_SIZE,			greenBits),

-    __ATTRIB(__DRI_ATTRIB_BLUE_SIZE,			blueBits),

-    __ATTRIB(__DRI_ATTRIB_ALPHA_SIZE,			alphaBits),

-    __ATTRIB(__DRI_ATTRIB_DEPTH_SIZE,			depthBits),

-    __ATTRIB(__DRI_ATTRIB_STENCIL_SIZE,			stencilBits),

-    __ATTRIB(__DRI_ATTRIB_ACCUM_RED_SIZE,		accumRedBits),

-    __ATTRIB(__DRI_ATTRIB_ACCUM_GREEN_SIZE,		accumGreenBits),

-    __ATTRIB(__DRI_ATTRIB_ACCUM_BLUE_SIZE,		accumBlueBits),

-    __ATTRIB(__DRI_ATTRIB_ACCUM_ALPHA_SIZE,		accumAlphaBits),

-    __ATTRIB(__DRI_ATTRIB_SAMPLE_BUFFERS,		sampleBuffers),

-    __ATTRIB(__DRI_ATTRIB_SAMPLES,			samples),

-    __ATTRIB(__DRI_ATTRIB_DOUBLE_BUFFER,		doubleBufferMode),

-    __ATTRIB(__DRI_ATTRIB_STEREO,			stereoMode),

-    __ATTRIB(__DRI_ATTRIB_AUX_BUFFERS,			numAuxBuffers),

-    __ATTRIB(__DRI_ATTRIB_TRANSPARENT_TYPE,		transparentPixel),

-    __ATTRIB(__DRI_ATTRIB_TRANSPARENT_INDEX_VALUE,	transparentPixel),

-    __ATTRIB(__DRI_ATTRIB_TRANSPARENT_RED_VALUE,	transparentRed),

-    __ATTRIB(__DRI_ATTRIB_TRANSPARENT_GREEN_VALUE,	transparentGreen),

-    __ATTRIB(__DRI_ATTRIB_TRANSPARENT_BLUE_VALUE,	transparentBlue),

-    __ATTRIB(__DRI_ATTRIB_TRANSPARENT_ALPHA_VALUE,	transparentAlpha),

-    __ATTRIB(__DRI_ATTRIB_FLOAT_MODE,			floatMode),

-    __ATTRIB(__DRI_ATTRIB_RED_MASK,			redMask),

-    __ATTRIB(__DRI_ATTRIB_GREEN_MASK,			greenMask),

-    __ATTRIB(__DRI_ATTRIB_BLUE_MASK,			blueMask),

-    __ATTRIB(__DRI_ATTRIB_ALPHA_MASK,			alphaMask),

-    __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_WIDTH,		maxPbufferWidth),

-    __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_HEIGHT,		maxPbufferHeight),

-    __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_PIXELS,		maxPbufferPixels),

-    __ATTRIB(__DRI_ATTRIB_OPTIMAL_PBUFFER_WIDTH,	optimalPbufferWidth),

-    __ATTRIB(__DRI_ATTRIB_OPTIMAL_PBUFFER_HEIGHT,	optimalPbufferHeight),

-    __ATTRIB(__DRI_ATTRIB_SWAP_METHOD,			swapMethod),

-    __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_RGB,		bindToTextureRgb),

-    __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_RGBA,		bindToTextureRgba),

-    __ATTRIB(__DRI_ATTRIB_BIND_TO_MIPMAP_TEXTURE,	bindToMipmapTexture),

-    __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_TARGETS,	bindToTextureTargets),

-    __ATTRIB(__DRI_ATTRIB_YINVERTED,			yInverted),

-

-    /* The struct field doesn't matter here, these are handled by the

-     * switch in driGetConfigAttribIndex.  We need them in the array

-     * so the iterator includes them though.*/

-    __ATTRIB(__DRI_ATTRIB_RENDER_TYPE,			level),

-    __ATTRIB(__DRI_ATTRIB_CONFIG_CAVEAT,		level),

-    __ATTRIB(__DRI_ATTRIB_SWAP_METHOD,			level)

-};

-

-#define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))

-

-

-/**

- * Return the value of a configuration attribute.  The attribute is

- * indicated by the index.

- */

-static int

-driGetConfigAttribIndex(const __DRIconfig *config,

-			unsigned int index, unsigned int *value)

-{

-    switch (attribMap[index].attrib) {

-    case __DRI_ATTRIB_RENDER_TYPE:

-        /* no support for color index mode */

-	*value = __DRI_ATTRIB_RGBA_BIT;

-	break;

-    case __DRI_ATTRIB_CONFIG_CAVEAT:

-	if (config->modes.visualRating == GLX_NON_CONFORMANT_CONFIG)

-	    *value = __DRI_ATTRIB_NON_CONFORMANT_CONFIG;

-	else if (config->modes.visualRating == GLX_SLOW_CONFIG)

-	    *value = __DRI_ATTRIB_SLOW_BIT;

-	else

-	    *value = 0;

-	break;

-    case __DRI_ATTRIB_SWAP_METHOD:

-        /* XXX no return value??? */

-	break;

-

-    case __DRI_ATTRIB_FLOAT_MODE:

-        /* this field is not int-sized */

-        *value = config->modes.floatMode;

-        break;

-

-    default:

-        /* any other int-sized field */

-	*value = *(unsigned int *)

-	    ((char *) &config->modes + attribMap[index].offset);

-	

-	break;

-    }

-

-    return GL_TRUE;

-}

-

-

-/**

- * Get the value of a configuration attribute.

- * \param attrib  the attribute (one of the _DRI_ATTRIB_x tokens)

- * \param value  returns the attribute's value

- * \return 1 for success, 0 for failure

- */

-int

-driGetConfigAttrib(const __DRIconfig *config,

-		   unsigned int attrib, unsigned int *value)

-{

-    int i;

-

-    for (i = 0; i < ARRAY_SIZE(attribMap); i++)

-	if (attribMap[i].attrib == attrib)

-	    return driGetConfigAttribIndex(config, i, value);

-

-    return GL_FALSE;

-}

-

-

-/**

- * Get a configuration attribute name and value, given an index.

- * \param index  which field of the __DRIconfig to query

- * \param attrib  returns the attribute name (one of the _DRI_ATTRIB_x tokens)

- * \param value  returns the attribute's value

- * \return 1 for success, 0 for failure

- */

-int

-driIndexConfigAttrib(const __DRIconfig *config, int index,

-		     unsigned int *attrib, unsigned int *value)

-{

-    if (index >= 0 && index < ARRAY_SIZE(attribMap)) {

-	*attrib = attribMap[index].attrib;

-	return driGetConfigAttribIndex(config, index, value);

-    }

-

-    return GL_FALSE;

-}

+/*
+ * (C) Copyright IBM Corporation 2002, 2004
+ * 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
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, 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 (including the next
+ * paragraph) 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 NON-INFRINGEMENT.  IN NO EVENT SHALL
+ * VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS 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 utils.c
+ * Utility functions for DRI drivers.
+ *
+ * \author Ian Romanick <idr@us.ibm.com>
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include "main/mtypes.h"
+#include "main/cpuinfo.h"
+#include "main/extensions.h"
+#include "utils.h"
+
+
+/**
+ * Print message to \c stderr if the \c LIBGL_DEBUG environment variable
+ * is set. 
+ * 
+ * Is called from the drivers.
+ * 
+ * \param f \c printf like format string.
+ */
+void
+__driUtilMessage(const char *f, ...)
+{
+    va_list args;
+
+    if (getenv("LIBGL_DEBUG")) {
+        fprintf(stderr, "libGL: ");
+        va_start(args, f);
+        vfprintf(stderr, f, args);
+        va_end(args);
+        fprintf(stderr, "\n");
+    }
+}
+
+
+unsigned
+driParseDebugString( const char * debug, 
+		     const struct dri_debug_control * control  )
+{
+   unsigned   flag;
+
+
+   flag = 0;
+   if ( debug != NULL ) {
+      while( control->string != NULL ) {
+	 if ( !strcmp( debug, "all" ) ||
+	      strstr( debug, control->string ) != NULL ) {
+	    flag |= control->flag;
+	 }
+
+	 control++;
+      }
+   }
+
+   return flag;
+}
+
+
+
+/**
+ * Create the \c GL_RENDERER string for DRI drivers.
+ * 
+ * Almost all DRI drivers use a \c GL_RENDERER string of the form:
+ *
+ *    "Mesa DRI <chip> <driver date> <AGP speed) <CPU information>"
+ *
+ * Using the supplied chip name, driver data, and AGP speed, this function
+ * creates the string.
+ * 
+ * \param buffer         Buffer to hold the \c GL_RENDERER string.
+ * \param hardware_name  Name of the hardware.
+ * \param driver_date    Driver date.
+ * \param agp_mode       AGP mode (speed).
+ * 
+ * \returns
+ * The length of the string stored in \c buffer.  This does \b not include
+ * the terminating \c NUL character.
+ */
+unsigned
+driGetRendererString( char * buffer, const char * hardware_name,
+		      const char * driver_date, GLuint agp_mode )
+{
+   unsigned offset;
+   char *cpu;
+
+   offset = sprintf( buffer, "Mesa DRI %s %s", hardware_name, driver_date );
+
+   /* Append any AGP-specific information.
+    */
+   switch ( agp_mode ) {
+   case 1:
+   case 2:
+   case 4:
+   case 8:
+      offset += sprintf( & buffer[ offset ], " AGP %ux", agp_mode );
+      break;
+	
+   default:
+      break;
+   }
+
+   /* Append any CPU-specific information.
+    */
+   cpu = _mesa_get_cpu_string();
+   if (cpu) {
+      offset += sprintf(buffer + offset, " %s", cpu);
+      free(cpu);
+   }
+
+   return offset;
+}
+
+
+
+
+#define need_GL_ARB_copy_buffer
+#define need_GL_ARB_draw_buffers
+#define need_GL_ARB_multisample
+#define need_GL_ARB_texture_compression
+#define need_GL_ARB_transpose_matrix
+#define need_GL_ARB_vertex_buffer_object
+#define need_GL_ARB_window_pos
+#define need_GL_EXT_compiled_vertex_array
+#define need_GL_EXT_multi_draw_arrays
+#define need_GL_EXT_polygon_offset
+#define need_GL_EXT_texture_object
+#define need_GL_EXT_vertex_array
+#define need_GL_IBM_multimode_draw_arrays
+#define need_GL_MESA_window_pos
+
+/* These are needed in *all* drivers because Mesa internally implements
+ * certain functionality in terms of functions provided by these extensions.
+ * For example, glBlendFunc is implemented by calling glBlendFuncSeparateEXT.
+ */
+#define need_GL_EXT_blend_func_separate
+#define need_GL_NV_vertex_program
+
+#include "main/remap_helper.h"
+
+static const struct dri_extension all_mesa_extensions[] = {
+   { "GL_ARB_copy_buffer",           GL_ARB_copy_buffer_functions },
+   { "GL_ARB_draw_buffers",          GL_ARB_draw_buffers_functions },
+   { "GL_ARB_multisample",           GL_ARB_multisample_functions },
+   { "GL_ARB_texture_compression",   GL_ARB_texture_compression_functions },
+   { "GL_ARB_transpose_matrix",      GL_ARB_transpose_matrix_functions },
+   { "GL_ARB_vertex_buffer_object",  GL_ARB_vertex_buffer_object_functions},
+   { "GL_ARB_window_pos",            GL_ARB_window_pos_functions },
+   { "GL_EXT_blend_func_separate",   GL_EXT_blend_func_separate_functions },
+   { "GL_EXT_compiled_vertex_array", GL_EXT_compiled_vertex_array_functions },
+   { "GL_EXT_multi_draw_arrays",     GL_EXT_multi_draw_arrays_functions },
+   { "GL_EXT_polygon_offset",        GL_EXT_polygon_offset_functions },
+   { "GL_EXT_texture_object",        GL_EXT_texture_object_functions },
+   { "GL_EXT_vertex_array",          GL_EXT_vertex_array_functions },
+   { "GL_IBM_multimode_draw_arrays", GL_IBM_multimode_draw_arrays_functions },
+   { "GL_MESA_window_pos",           GL_MESA_window_pos_functions },
+   { "GL_NV_vertex_program",         GL_NV_vertex_program_functions },
+   { NULL,                           NULL }
+};
+
+
+/**
+ * Enable and map extensions supported by the driver.
+ * 
+ * When ctx is NULL, extensions are not enabled, but their functions
+ * are still mapped.  When extensions_to_enable is NULL, all static
+ * functions known to mesa core are mapped.
+ *
+ * \bug
+ * ARB_imaging isn't handled properly.  In Mesa, enabling ARB_imaging also
+ * enables all the sub-extensions that are folded into it.  This means that
+ * we need to add entry-points (via \c driInitSingleExtension) for those
+ * new functions here.
+ */
+void driInitExtensions( struct gl_context * ctx,
+			const struct dri_extension * extensions_to_enable,
+			GLboolean enable_imaging )
+{
+   static int first_time = 1;
+   unsigned   i;
+
+   if ( first_time ) {
+      first_time = 0;
+      driInitExtensions( NULL, all_mesa_extensions, GL_FALSE );
+   }
+
+   if ( (ctx != NULL) && enable_imaging ) {
+      _mesa_enable_imaging_extensions( ctx );
+   }
+
+   /* The caller is too lazy to list any extension */
+   if ( extensions_to_enable == NULL ) {
+      /* Map the static functions.  Together with those mapped by remap
+       * table, this should cover everything mesa core knows.
+       */
+      _mesa_map_static_functions();
+      return;
+   }
+
+   for ( i = 0 ; extensions_to_enable[i].name != NULL ; i++ ) {
+       driInitSingleExtension( ctx, & extensions_to_enable[i] );
+   }
+}
+
+
+
+
+/**
+ * Enable and map functions for a single extension
+ * 
+ * \param ctx  Context where extension is to be enabled.
+ * \param ext  Extension that is to be enabled.
+ * 
+ * \sa driInitExtensions, _mesa_enable_extension, _mesa_map_function_array
+ */
+void driInitSingleExtension( struct gl_context * ctx,
+			     const struct dri_extension * ext )
+{
+    if ( ext->functions != NULL ) {
+       _mesa_map_function_array(ext->functions);
+    }
+
+    if ( ctx != NULL ) {
+	_mesa_enable_extension( ctx, ext->name );
+    }
+}
+
+
+/**
+ * Utility function used by drivers to test the verions of other components.
+ *
+ * \param driver_name  Name of the driver.  Used in error messages.
+ * \param driActual    Actual DRI version supplied __driCreateNewScreen.
+ * \param driExpected  Minimum DRI version required by the driver.
+ * \param ddxActual    Actual DDX version supplied __driCreateNewScreen.
+ * \param ddxExpected  Minimum DDX minor and range of DDX major version required by the driver.
+ * \param drmActual    Actual DRM version supplied __driCreateNewScreen.
+ * \param drmExpected  Minimum DRM version required by the driver.
+ * 
+ * \returns \c GL_TRUE if all version requirements are met.  Otherwise,
+ *          \c GL_FALSE is returned.
+ * 
+ * \sa __driCreateNewScreen, driCheckDriDdxDrmVersions2
+ *
+ * \todo
+ * Now that the old \c driCheckDriDdxDrmVersions function is gone, this
+ * function and \c driCheckDriDdxDrmVersions2 should be renamed.
+ */
+GLboolean
+driCheckDriDdxDrmVersions3(const char * driver_name,
+			   const __DRIversion * driActual,
+			   const __DRIversion * driExpected,
+			   const __DRIversion * ddxActual,
+			   const __DRIutilversion2 * ddxExpected,
+			   const __DRIversion * drmActual,
+			   const __DRIversion * drmExpected)
+{
+   static const char format[] = "%s DRI driver expected %s version %d.%d.x "
+       "but got version %d.%d.%d\n";
+   static const char format2[] = "%s DRI driver expected %s version %d-%d.%d.x "
+       "but got version %d.%d.%d\n";
+
+
+   /* Check the DRI version */
+   if ( (driActual->major != driExpected->major)
+	|| (driActual->minor < driExpected->minor) ) {
+      fprintf(stderr, format, driver_name, "DRI",
+		       driExpected->major, driExpected->minor,
+		       driActual->major, driActual->minor, driActual->patch);
+      return GL_FALSE;
+   }
+
+   /* Check that the DDX driver version is compatible */
+   if ( (ddxActual->major < ddxExpected->major_min)
+	|| (ddxActual->major > ddxExpected->major_max)
+	|| (ddxActual->minor < ddxExpected->minor) ) {
+      fprintf(stderr, format2, driver_name, "DDX",
+		       ddxExpected->major_min, ddxExpected->major_max, ddxExpected->minor,
+		       ddxActual->major, ddxActual->minor, ddxActual->patch);
+      return GL_FALSE;
+   }
+   
+   /* Check that the DRM driver version is compatible */
+   if ( (drmActual->major != drmExpected->major)
+	|| (drmActual->minor < drmExpected->minor) ) {
+      fprintf(stderr, format, driver_name, "DRM",
+		       drmExpected->major, drmExpected->minor,
+		       drmActual->major, drmActual->minor, drmActual->patch);
+      return GL_FALSE;
+   }
+
+   return GL_TRUE;
+}
+
+GLboolean
+driCheckDriDdxDrmVersions2(const char * driver_name,
+			   const __DRIversion * driActual,
+			   const __DRIversion * driExpected,
+			   const __DRIversion * ddxActual,
+			   const __DRIversion * ddxExpected,
+			   const __DRIversion * drmActual,
+			   const __DRIversion * drmExpected)
+{
+   __DRIutilversion2 ddx_expected;
+   ddx_expected.major_min = ddxExpected->major;
+   ddx_expected.major_max = ddxExpected->major;
+   ddx_expected.minor = ddxExpected->minor;
+   ddx_expected.patch = ddxExpected->patch;
+   return driCheckDriDdxDrmVersions3(driver_name, driActual,
+				driExpected, ddxActual, & ddx_expected,
+				drmActual, drmExpected);
+}
+
+GLboolean driClipRectToFramebuffer( const struct gl_framebuffer *buffer,
+				    GLint *x, GLint *y,
+				    GLsizei *width, GLsizei *height )
+{
+   /* left clipping */
+   if (*x < buffer->_Xmin) {
+      *width -= (buffer->_Xmin - *x);
+      *x = buffer->_Xmin;
+   }
+
+   /* right clipping */
+   if (*x + *width > buffer->_Xmax)
+      *width -= (*x + *width - buffer->_Xmax - 1);
+
+   if (*width <= 0)
+      return GL_FALSE;
+
+   /* bottom clipping */
+   if (*y < buffer->_Ymin) {
+      *height -= (buffer->_Ymin - *y);
+      *y = buffer->_Ymin;
+   }
+
+   /* top clipping */
+   if (*y + *height > buffer->_Ymax)
+      *height -= (*y + *height - buffer->_Ymax - 1);
+
+   if (*height <= 0)
+      return GL_FALSE;
+
+   return GL_TRUE;
+}
+
+/**
+ * Creates a set of \c struct gl_config that a driver will expose.
+ * 
+ * A set of \c struct gl_config will be created based on the supplied
+ * parameters.  The number of modes processed will be 2 *
+ * \c num_depth_stencil_bits * \c num_db_modes.
+ * 
+ * For the most part, data is just copied from \c depth_bits, \c stencil_bits,
+ * \c db_modes, and \c visType into each \c struct gl_config element.
+ * However, the meanings of \c fb_format and \c fb_type require further
+ * explanation.  The \c fb_format specifies which color components are in
+ * each pixel and what the default order is.  For example, \c GL_RGB specifies
+ * that red, green, blue are available and red is in the "most significant"
+ * position and blue is in the "least significant".  The \c fb_type specifies
+ * the bit sizes of each component and the actual ordering.  For example, if
+ * \c GL_UNSIGNED_SHORT_5_6_5_REV is specified with \c GL_RGB, bits [15:11]
+ * are the blue value, bits [10:5] are the green value, and bits [4:0] are
+ * the red value.
+ * 
+ * One sublte issue is the combination of \c GL_RGB  or \c GL_BGR and either
+ * of the \c GL_UNSIGNED_INT_8_8_8_8 modes.  The resulting mask values in the
+ * \c struct gl_config structure is \b identical to the \c GL_RGBA or
+ * \c GL_BGRA case, except the \c alphaMask is zero.  This means that, as
+ * far as this routine is concerned, \c GL_RGB with \c GL_UNSIGNED_INT_8_8_8_8
+ * still uses 32-bits.
+ *
+ * If in doubt, look at the tables used in the function.
+ * 
+ * \param ptr_to_modes  Pointer to a pointer to a linked list of
+ *                      \c struct gl_config.  Upon completion, a pointer to
+ *                      the next element to be process will be stored here.
+ *                      If the function fails and returns \c GL_FALSE, this
+ *                      value will be unmodified, but some elements in the
+ *                      linked list may be modified.
+ * \param fb_format     Format of the framebuffer.  Currently only \c GL_RGB,
+ *                      \c GL_RGBA, \c GL_BGR, and \c GL_BGRA are supported.
+ * \param fb_type       Type of the pixels in the framebuffer.  Currently only
+ *                      \c GL_UNSIGNED_SHORT_5_6_5, 
+ *                      \c GL_UNSIGNED_SHORT_5_6_5_REV,
+ *                      \c GL_UNSIGNED_INT_8_8_8_8, and
+ *                      \c GL_UNSIGNED_INT_8_8_8_8_REV are supported.
+ * \param depth_bits    Array of depth buffer sizes to be exposed.
+ * \param stencil_bits  Array of stencil buffer sizes to be exposed.
+ * \param num_depth_stencil_bits  Number of entries in both \c depth_bits and
+ *                      \c stencil_bits.
+ * \param db_modes      Array of buffer swap modes.  If an element has a
+ *                      value of \c GLX_NONE, then it represents a
+ *                      single-buffered mode.  Other valid values are
+ *                      \c GLX_SWAP_EXCHANGE_OML, \c GLX_SWAP_COPY_OML, and
+ *                      \c GLX_SWAP_UNDEFINED_OML.  See the
+ *                      GLX_OML_swap_method extension spec for more details.
+ * \param num_db_modes  Number of entries in \c db_modes.
+ * \param msaa_samples  Array of msaa sample count. 0 represents a visual
+ *                      without a multisample buffer.
+ * \param num_msaa_modes Number of entries in \c msaa_samples.
+ * \param visType       GLX visual type.  Usually either \c GLX_TRUE_COLOR or
+ *                      \c GLX_DIRECT_COLOR.
+ * 
+ * \returns
+ * \c GL_TRUE on success or \c GL_FALSE on failure.  Currently the only
+ * cause of failure is a bad parameter (i.e., unsupported \c fb_format or
+ * \c fb_type).
+ * 
+ * \todo
+ * There is currently no way to support packed RGB modes (i.e., modes with
+ * exactly 3 bytes per pixel) or floating-point modes.  This could probably
+ * be done by creating some new, private enums with clever names likes
+ * \c GL_UNSIGNED_3BYTE_8_8_8, \c GL_4FLOAT_32_32_32_32, 
+ * \c GL_4HALF_16_16_16_16, etc.  We can cross that bridge when we come to it.
+ */
+__DRIconfig **
+driCreateConfigs(GLenum fb_format, GLenum fb_type,
+		 const uint8_t * depth_bits, const uint8_t * stencil_bits,
+		 unsigned num_depth_stencil_bits,
+		 const GLenum * db_modes, unsigned num_db_modes,
+		 const uint8_t * msaa_samples, unsigned num_msaa_modes,
+		 GLboolean enable_accum)
+{
+   static const uint8_t bits_table[4][4] = {
+     /* R  G  B  A */
+      { 3, 3, 2, 0 }, /* Any GL_UNSIGNED_BYTE_3_3_2 */
+      { 5, 6, 5, 0 }, /* Any GL_UNSIGNED_SHORT_5_6_5 */
+      { 8, 8, 8, 0 }, /* Any RGB with any GL_UNSIGNED_INT_8_8_8_8 */
+      { 8, 8, 8, 8 }  /* Any RGBA with any GL_UNSIGNED_INT_8_8_8_8 */
+   };
+
+   static const uint32_t masks_table_rgb[6][4] = {
+      { 0x000000E0, 0x0000001C, 0x00000003, 0x00000000 }, /* 3_3_2       */
+      { 0x00000007, 0x00000038, 0x000000C0, 0x00000000 }, /* 2_3_3_REV   */
+      { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5       */
+      { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5_REV   */
+      { 0xFF000000, 0x00FF0000, 0x0000FF00, 0x00000000 }, /* 8_8_8_8     */
+      { 0x000000FF, 0x0000FF00, 0x00FF0000, 0x00000000 }  /* 8_8_8_8_REV */
+   };
+
+   static const uint32_t masks_table_rgba[6][4] = {
+      { 0x000000E0, 0x0000001C, 0x00000003, 0x00000000 }, /* 3_3_2       */
+      { 0x00000007, 0x00000038, 0x000000C0, 0x00000000 }, /* 2_3_3_REV   */
+      { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5       */
+      { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5_REV   */
+      { 0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF }, /* 8_8_8_8     */
+      { 0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000 }, /* 8_8_8_8_REV */
+   };
+
+   static const uint32_t masks_table_bgr[6][4] = {
+      { 0x00000007, 0x00000038, 0x000000C0, 0x00000000 }, /* 3_3_2       */
+      { 0x000000E0, 0x0000001C, 0x00000003, 0x00000000 }, /* 2_3_3_REV   */
+      { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5       */
+      { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5_REV   */
+      { 0x0000FF00, 0x00FF0000, 0xFF000000, 0x00000000 }, /* 8_8_8_8     */
+      { 0x00FF0000, 0x0000FF00, 0x000000FF, 0x00000000 }, /* 8_8_8_8_REV */
+   };
+
+   static const uint32_t masks_table_bgra[6][4] = {
+      { 0x00000007, 0x00000038, 0x000000C0, 0x00000000 }, /* 3_3_2       */
+      { 0x000000E0, 0x0000001C, 0x00000003, 0x00000000 }, /* 2_3_3_REV   */
+      { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5       */
+      { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5_REV   */
+      { 0x0000FF00, 0x00FF0000, 0xFF000000, 0x000000FF }, /* 8_8_8_8     */
+      { 0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000 }, /* 8_8_8_8_REV */
+   };
+
+   static const uint8_t bytes_per_pixel[6] = {
+      1, /* 3_3_2       */
+      1, /* 2_3_3_REV   */
+      2, /* 5_6_5       */
+      2, /* 5_6_5_REV   */
+      4, /* 8_8_8_8     */
+      4  /* 8_8_8_8_REV */
+   };
+
+   const uint8_t  * bits;
+   const uint32_t * masks;
+   int index;
+   __DRIconfig **configs, **c;
+   struct gl_config *modes;
+   unsigned i, j, k, h;
+   unsigned num_modes;
+   unsigned num_accum_bits = (enable_accum) ? 2 : 1;
+
+   switch ( fb_type ) {
+      case GL_UNSIGNED_BYTE_3_3_2:
+	 index = 0;
+	 break;
+      case GL_UNSIGNED_BYTE_2_3_3_REV:
+	 index = 1;
+	 break;
+      case GL_UNSIGNED_SHORT_5_6_5:
+	 index = 2;
+	 break;
+      case GL_UNSIGNED_SHORT_5_6_5_REV:
+	 index = 3;
+	 break;
+      case GL_UNSIGNED_INT_8_8_8_8:
+	 index = 4;
+	 break;
+      case GL_UNSIGNED_INT_8_8_8_8_REV:
+	 index = 5;
+	 break;
+      default:
+	 fprintf( stderr, "[%s:%u] Unknown framebuffer type 0x%04x.\n",
+               __FUNCTION__, __LINE__, fb_type );
+	 return NULL;
+   }
+
+
+   /* Valid types are GL_UNSIGNED_SHORT_5_6_5 and GL_UNSIGNED_INT_8_8_8_8 and
+    * the _REV versions.
+    *
+    * Valid formats are GL_RGBA, GL_RGB, and GL_BGRA.
+    */
+
+   switch ( fb_format ) {
+      case GL_RGB:
+         masks = masks_table_rgb[ index ];
+         break;
+
+      case GL_RGBA:
+         masks = masks_table_rgba[ index ];
+         break;
+
+      case GL_BGR:
+         masks = masks_table_bgr[ index ];
+         break;
+
+      case GL_BGRA:
+         masks = masks_table_bgra[ index ];
+         break;
+
+      default:
+         fprintf( stderr, "[%s:%u] Unknown framebuffer format 0x%04x.\n",
+               __FUNCTION__, __LINE__, fb_format );
+         return NULL;
+   }
+
+   switch ( bytes_per_pixel[ index ] ) {
+      case 1:
+	 bits = bits_table[0];
+	 break;
+      case 2:
+	 bits = bits_table[1];
+	 break;
+      default:
+	 bits = ((fb_format == GL_RGB) || (fb_format == GL_BGR))
+	    ? bits_table[2]
+	    : bits_table[3];
+	 break;
+   }
+
+   num_modes = num_depth_stencil_bits * num_db_modes * num_accum_bits * num_msaa_modes;
+   configs = calloc(1, (num_modes + 1) * sizeof *configs);
+   if (configs == NULL)
+       return NULL;
+
+    c = configs;
+    for ( k = 0 ; k < num_depth_stencil_bits ; k++ ) {
+	for ( i = 0 ; i < num_db_modes ; i++ ) {
+	    for ( h = 0 ; h < num_msaa_modes; h++ ) {
+	    	for ( j = 0 ; j < num_accum_bits ; j++ ) {
+		    *c = malloc (sizeof **c);
+		    modes = &(*c)->modes;
+		    c++;
+
+		    memset(modes, 0, sizeof *modes);
+		    modes->redBits   = bits[0];
+		    modes->greenBits = bits[1];
+		    modes->blueBits  = bits[2];
+		    modes->alphaBits = bits[3];
+		    modes->redMask   = masks[0];
+		    modes->greenMask = masks[1];
+		    modes->blueMask  = masks[2];
+		    modes->alphaMask = masks[3];
+		    modes->rgbBits   = modes->redBits + modes->greenBits
+		    	+ modes->blueBits + modes->alphaBits;
+
+		    modes->accumRedBits   = 16 * j;
+		    modes->accumGreenBits = 16 * j;
+		    modes->accumBlueBits  = 16 * j;
+		    modes->accumAlphaBits = (masks[3] != 0) ? 16 * j : 0;
+		    modes->visualRating = (j == 0) ? GLX_NONE : GLX_SLOW_CONFIG;
+
+		    modes->stencilBits = stencil_bits[k];
+		    modes->depthBits = depth_bits[k];
+
+		    modes->transparentPixel = GLX_NONE;
+		    modes->transparentRed = GLX_DONT_CARE;
+		    modes->transparentGreen = GLX_DONT_CARE;
+		    modes->transparentBlue = GLX_DONT_CARE;
+		    modes->transparentAlpha = GLX_DONT_CARE;
+		    modes->transparentIndex = GLX_DONT_CARE;
+		    modes->rgbMode = GL_TRUE;
+
+		    if ( db_modes[i] == GLX_NONE ) {
+		    	modes->doubleBufferMode = GL_FALSE;
+		    }
+		    else {
+		    	modes->doubleBufferMode = GL_TRUE;
+		    	modes->swapMethod = db_modes[i];
+		    }
+
+		    modes->samples = msaa_samples[h];
+		    modes->sampleBuffers = modes->samples ? 1 : 0;
+
+
+		    modes->haveAccumBuffer = ((modes->accumRedBits +
+					   modes->accumGreenBits +
+					   modes->accumBlueBits +
+					   modes->accumAlphaBits) > 0);
+		    modes->haveDepthBuffer = (modes->depthBits > 0);
+		    modes->haveStencilBuffer = (modes->stencilBits > 0);
+
+		    modes->bindToTextureRgb = GL_TRUE;
+		    modes->bindToTextureRgba = GL_TRUE;
+		    modes->bindToMipmapTexture = GL_FALSE;
+		    modes->bindToTextureTargets =
+			__DRI_ATTRIB_TEXTURE_1D_BIT |
+			__DRI_ATTRIB_TEXTURE_2D_BIT |
+			__DRI_ATTRIB_TEXTURE_RECTANGLE_BIT;
+
+		    modes->sRGBCapable = GL_FALSE;
+		}
+	    }
+	}
+    }
+    *c = NULL;
+
+    return configs;
+}
+
+__DRIconfig **driConcatConfigs(__DRIconfig **a,
+			       __DRIconfig **b)
+{
+    __DRIconfig **all;
+    int i, j, index;
+
+    i = 0;
+    while (a[i] != NULL)
+	i++;
+    j = 0;
+    while (b[j] != NULL)
+	j++;
+   
+    all = malloc((i + j + 1) * sizeof *all);
+    index = 0;
+    for (i = 0; a[i] != NULL; i++)
+	all[index++] = a[i];
+    for (j = 0; b[j] != NULL; j++)
+	all[index++] = b[j];
+    all[index++] = NULL;
+
+    free(a);
+    free(b);
+
+    return all;
+}
+
+#define __ATTRIB(attrib, field) \
+    { attrib, offsetof(struct gl_config, field) }
+
+static const struct { unsigned int attrib, offset; } attribMap[] = {
+    __ATTRIB(__DRI_ATTRIB_BUFFER_SIZE,			rgbBits),
+    __ATTRIB(__DRI_ATTRIB_LEVEL,			level),
+    __ATTRIB(__DRI_ATTRIB_RED_SIZE,			redBits),
+    __ATTRIB(__DRI_ATTRIB_GREEN_SIZE,			greenBits),
+    __ATTRIB(__DRI_ATTRIB_BLUE_SIZE,			blueBits),
+    __ATTRIB(__DRI_ATTRIB_ALPHA_SIZE,			alphaBits),
+    __ATTRIB(__DRI_ATTRIB_DEPTH_SIZE,			depthBits),
+    __ATTRIB(__DRI_ATTRIB_STENCIL_SIZE,			stencilBits),
+    __ATTRIB(__DRI_ATTRIB_ACCUM_RED_SIZE,		accumRedBits),
+    __ATTRIB(__DRI_ATTRIB_ACCUM_GREEN_SIZE,		accumGreenBits),
+    __ATTRIB(__DRI_ATTRIB_ACCUM_BLUE_SIZE,		accumBlueBits),
+    __ATTRIB(__DRI_ATTRIB_ACCUM_ALPHA_SIZE,		accumAlphaBits),
+    __ATTRIB(__DRI_ATTRIB_SAMPLE_BUFFERS,		sampleBuffers),
+    __ATTRIB(__DRI_ATTRIB_SAMPLES,			samples),
+    __ATTRIB(__DRI_ATTRIB_DOUBLE_BUFFER,		doubleBufferMode),
+    __ATTRIB(__DRI_ATTRIB_STEREO,			stereoMode),
+    __ATTRIB(__DRI_ATTRIB_AUX_BUFFERS,			numAuxBuffers),
+    __ATTRIB(__DRI_ATTRIB_TRANSPARENT_TYPE,		transparentPixel),
+    __ATTRIB(__DRI_ATTRIB_TRANSPARENT_INDEX_VALUE,	transparentPixel),
+    __ATTRIB(__DRI_ATTRIB_TRANSPARENT_RED_VALUE,	transparentRed),
+    __ATTRIB(__DRI_ATTRIB_TRANSPARENT_GREEN_VALUE,	transparentGreen),
+    __ATTRIB(__DRI_ATTRIB_TRANSPARENT_BLUE_VALUE,	transparentBlue),
+    __ATTRIB(__DRI_ATTRIB_TRANSPARENT_ALPHA_VALUE,	transparentAlpha),
+    __ATTRIB(__DRI_ATTRIB_FLOAT_MODE,			floatMode),
+    __ATTRIB(__DRI_ATTRIB_RED_MASK,			redMask),
+    __ATTRIB(__DRI_ATTRIB_GREEN_MASK,			greenMask),
+    __ATTRIB(__DRI_ATTRIB_BLUE_MASK,			blueMask),
+    __ATTRIB(__DRI_ATTRIB_ALPHA_MASK,			alphaMask),
+    __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_WIDTH,		maxPbufferWidth),
+    __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_HEIGHT,		maxPbufferHeight),
+    __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_PIXELS,		maxPbufferPixels),
+    __ATTRIB(__DRI_ATTRIB_OPTIMAL_PBUFFER_WIDTH,	optimalPbufferWidth),
+    __ATTRIB(__DRI_ATTRIB_OPTIMAL_PBUFFER_HEIGHT,	optimalPbufferHeight),
+    __ATTRIB(__DRI_ATTRIB_SWAP_METHOD,			swapMethod),
+    __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_RGB,		bindToTextureRgb),
+    __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_RGBA,		bindToTextureRgba),
+    __ATTRIB(__DRI_ATTRIB_BIND_TO_MIPMAP_TEXTURE,	bindToMipmapTexture),
+    __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_TARGETS,	bindToTextureTargets),
+    __ATTRIB(__DRI_ATTRIB_YINVERTED,			yInverted),
+    __ATTRIB(__DRI_ATTRIB_FRAMEBUFFER_SRGB_CAPABLE,	sRGBCapable),
+
+    /* The struct field doesn't matter here, these are handled by the
+     * switch in driGetConfigAttribIndex.  We need them in the array
+     * so the iterator includes them though.*/
+    __ATTRIB(__DRI_ATTRIB_RENDER_TYPE,			level),
+    __ATTRIB(__DRI_ATTRIB_CONFIG_CAVEAT,		level),
+    __ATTRIB(__DRI_ATTRIB_SWAP_METHOD,			level)
+};
+
+#define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
+
+
+/**
+ * Return the value of a configuration attribute.  The attribute is
+ * indicated by the index.
+ */
+static int
+driGetConfigAttribIndex(const __DRIconfig *config,
+			unsigned int index, unsigned int *value)
+{
+    switch (attribMap[index].attrib) {
+    case __DRI_ATTRIB_RENDER_TYPE:
+        /* no support for color index mode */
+	*value = __DRI_ATTRIB_RGBA_BIT;
+	break;
+    case __DRI_ATTRIB_CONFIG_CAVEAT:
+	if (config->modes.visualRating == GLX_NON_CONFORMANT_CONFIG)
+	    *value = __DRI_ATTRIB_NON_CONFORMANT_CONFIG;
+	else if (config->modes.visualRating == GLX_SLOW_CONFIG)
+	    *value = __DRI_ATTRIB_SLOW_BIT;
+	else
+	    *value = 0;
+	break;
+    case __DRI_ATTRIB_SWAP_METHOD:
+        /* XXX no return value??? */
+	break;
+
+    case __DRI_ATTRIB_FLOAT_MODE:
+        /* this field is not int-sized */
+        *value = config->modes.floatMode;
+        break;
+
+    default:
+        /* any other int-sized field */
+	*value = *(unsigned int *)
+	    ((char *) &config->modes + attribMap[index].offset);
+	
+	break;
+    }
+
+    return GL_TRUE;
+}
+
+
+/**
+ * Get the value of a configuration attribute.
+ * \param attrib  the attribute (one of the _DRI_ATTRIB_x tokens)
+ * \param value  returns the attribute's value
+ * \return 1 for success, 0 for failure
+ */
+int
+driGetConfigAttrib(const __DRIconfig *config,
+		   unsigned int attrib, unsigned int *value)
+{
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(attribMap); i++)
+	if (attribMap[i].attrib == attrib)
+	    return driGetConfigAttribIndex(config, i, value);
+
+    return GL_FALSE;
+}
+
+
+/**
+ * Get a configuration attribute name and value, given an index.
+ * \param index  which field of the __DRIconfig to query
+ * \param attrib  returns the attribute name (one of the _DRI_ATTRIB_x tokens)
+ * \param value  returns the attribute's value
+ * \return 1 for success, 0 for failure
+ */
+int
+driIndexConfigAttrib(const __DRIconfig *config, int index,
+		     unsigned int *attrib, unsigned int *value)
+{
+    if (index >= 0 && index < ARRAY_SIZE(attribMap)) {
+	*attrib = attribMap[index].attrib;
+	return driGetConfigAttribIndex(config, index, value);
+    }
+
+    return GL_FALSE;
+}