xserver libX11 libxcb mesa git update 6 Apr 2011

1 files changed, 823 insertions, 824 deletions

diff --git a/mesalib/src/mesa/drivers/dri/common/utils.c b/mesalib/src/mesa/drivers/dri/common/utils.c
index 083edfaa9..539296d1a 100644
--- a/mesalib/src/mesa/drivers/dri/common/utils.c
+++ b/mesalib/src/mesa/drivers/dri/common/utils.c
@@ -1,824 +1,823 @@
-/*
- * (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;
-}
+/*

+ * (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 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,

+		      GLuint agp_mode )

+{

+   unsigned offset;

+   char *cpu;

+

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

+

+   /* 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;

+}