Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 876 insertions, 0 deletions

diff --git a/src/VBox/Additions/common/crOpenGL/utils.c b/src/VBox/Additions/common/crOpenGL/utils.c
new file mode 100644
index 00000000..a220d09d
--- /dev/null
+++ b/src/VBox/Additions/common/crOpenGL/utils.c
@@ -0,0 +1,876 @@
+/*
+ * (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 "mtypes.h"
+#include "extensions.h"
+#include "utils.h"
+#include "dispatch.h"
+
+int driDispatchRemapTable[ driDispatchRemapTable_size ];
+
+#if defined(USE_X86_ASM)
+#include "x86/common_x86_asm.h"
+#endif
+
+#if defined(USE_PPC_ASM)
+#include "ppc/common_ppc_features.h"
+#endif
+
+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 )
+{
+#define MAX_INFO   4
+   const char * cpu[MAX_INFO];
+   unsigned   next = 0;
+   unsigned   i;
+   unsigned   offset;
+
+
+   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.
+    */
+#ifdef USE_X86_ASM
+   if ( _mesa_x86_cpu_features ) {
+      cpu[next] = " x86";
+      next++;
+   }
+# ifdef USE_MMX_ASM
+   if ( cpu_has_mmx ) {
+      cpu[next] = (cpu_has_mmxext) ? "/MMX+" : "/MMX";
+      next++;
+   }
+# endif
+# ifdef USE_3DNOW_ASM
+   if ( cpu_has_3dnow ) {
+      cpu[next] = (cpu_has_3dnowext) ? "/3DNow!+" : "/3DNow!";
+      next++;
+   }
+# endif
+# ifdef USE_SSE_ASM
+   if ( cpu_has_xmm ) {
+      cpu[next] = (cpu_has_xmm2) ? "/SSE2" : "/SSE";
+      next++;
+   }
+# endif
+
+#elif defined(USE_SPARC_ASM)
+
+   cpu[0] = " SPARC";
+   next = 1;
+
+#elif defined(USE_PPC_ASM)
+   if ( _mesa_ppc_cpu_features ) {
+      cpu[next] = (cpu_has_64) ? " PowerPC 64" : " PowerPC";
+      next++;
+   }
+
+# ifdef USE_VMX_ASM
+   if ( cpu_has_vmx ) {
+      cpu[next] = "/Altivec";
+      next++;
+   }
+# endif
+
+   if ( ! cpu_has_fpu ) {
+      cpu[next] = "/No FPU";
+      next++;
+   }
+#endif
+
+   for ( i = 0 ; i < next ; i++ ) {
+      const size_t len = strlen( cpu[i] );
+
+      strncpy( & buffer[ offset ], cpu[i], len );
+      offset += len;
+   }
+
+   return offset;
+}
+
+
+
+
+#define need_GL_ARB_multisample
+#define need_GL_ARB_transpose_matrix
+#define need_GL_ARB_window_pos
+#define need_GL_EXT_compiled_vertex_array
+#define need_GL_EXT_polygon_offset
+#define need_GL_EXT_texture_object
+#define need_GL_EXT_vertex_array
+#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 "extension_helper.h"
+
+static const struct dri_extension all_mesa_extensions[] = {
+   { "GL_ARB_multisample",           GL_ARB_multisample_functions },
+   { "GL_ARB_transpose_matrix",      GL_ARB_transpose_matrix_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_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_MESA_window_pos",           GL_MESA_window_pos_functions },
+   { "GL_NV_vertex_program",         GL_NV_vertex_program_functions },
+   { NULL,                           NULL }
+};
+
+
+/**
+ * Enable extensions supported by the driver.
+ *
+ * \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( GLcontext * ctx,
+			const struct dri_extension * extensions_to_enable,
+			GLboolean enable_imaging )
+{
+   static int first_time = 1;
+   unsigned   i;
+
+   if ( first_time ) {
+      for ( i = 0 ; i < driDispatchRemapTable_size ; i++ ) {
+	 driDispatchRemapTable[i] = -1;
+      }
+
+      first_time = 0;
+      driInitExtensions( ctx, all_mesa_extensions, GL_FALSE );
+   }
+
+   if ( (ctx != NULL) && enable_imaging ) {
+      _mesa_enable_imaging_extensions( ctx );
+   }
+
+   for ( i = 0 ; extensions_to_enable[i].name != NULL ; i++ ) {
+       driInitSingleExtension( ctx, & extensions_to_enable[i] );
+   }
+}
+
+
+
+
+/**
+ * Enable and add dispatch 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, _glapi_add_entrypoint
+ *
+ * \todo
+ * Determine if it would be better to use \c strlen instead of the hardcoded
+ * for-loops.
+ */
+void driInitSingleExtension( GLcontext * ctx,
+			     const struct dri_extension * ext )
+{
+    unsigned i;
+
+
+    if ( ext->functions != NULL ) {
+	for ( i = 0 ; ext->functions[i].strings != NULL ; i++ ) {
+	    const char * functions[16];
+	    const char * parameter_signature;
+	    const char * str = ext->functions[i].strings;
+	    unsigned j;
+	    unsigned offset;
+
+
+	    /* Separate the parameter signature from the rest of the string.
+	     * If the parameter signature is empty (i.e., the string starts
+	     * with a NUL character), then the function has a void parameter
+	     * list.
+	     */
+	    parameter_signature = str;
+	    while ( str[0] != '\0' ) {
+		str++;
+	    }
+	    str++;
+
+
+	    /* Divide the string into the substrings that name each
+	     * entry-point for the function.
+	     */
+	    for ( j = 0 ; j < 16 ; j++ ) {
+		if ( str[0] == '\0' ) {
+		    functions[j] = NULL;
+		    break;
+		}
+
+		functions[j] = str;
+
+		while ( str[0] != '\0' ) {
+		    str++;
+		}
+		str++;
+	    }
+
+
+	    /* Add each entry-point to the dispatch table.
+	     */
+	    offset = _glapi_add_dispatch( functions, parameter_signature );
+	    if (offset == -1) {
+		fprintf(stderr, "DISPATCH ERROR! _glapi_add_dispatch failed "
+			"to add %s!\n", functions[0]);
+	    }
+	    else if (ext->functions[i].remap_index != -1) {
+		driDispatchRemapTable[ ext->functions[i].remap_index ] =
+		  offset;
+	    }
+	    else if (ext->functions[i].offset != offset) {
+		fprintf(stderr, "DISPATCH ERROR! %s -> %u != %u\n",
+			functions[0], offset, ext->functions[i].offset);
+	    }
+	}
+    }
+
+    if ( ctx != NULL ) {
+	_mesa_enable_extension( ctx, ext->name );
+    }
+}
+
+
+/**
+ * Utility function used by drivers to test the versions of other components.
+ *
+ * If one of the version requirements is not met, a message is logged using
+ * \c __driUtilMessage.
+ *
+ * \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, __driUtilMessage
+ *
+ * \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 */
+   /* for miniglx we pass in -1 so we can ignore the DDX version */
+   if ( (ddxActual->major != -1) && ((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 GLframebuffer *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 __GLcontextModes that a driver will expose.
+ *
+ * A set of \c __GLcontextModes 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 __GLcontextModes 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 subtle 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 __GLcontextModes 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 __GLcontextModes.  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 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 u_int8_t * depth_bits, const u_int8_t * stencil_bits,
+		 unsigned num_depth_stencil_bits,
+		 const GLenum * db_modes, unsigned num_db_modes)
+{
+   static const u_int8_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 u_int32_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 u_int32_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 u_int32_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 u_int32_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 u_int8_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 u_int8_t  * bits;
+   const u_int32_t * masks;
+   int index;
+   __DRIconfig **configs, **c;
+   __GLcontextModes *modes;
+   unsigned i;
+   unsigned j;
+   unsigned k;
+   unsigned num_modes;
+   unsigned num_accum_bits = 2;
+
+   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:%d] 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:%d] 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;
+   configs = _mesa_calloc((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 ( j = 0 ; j < num_accum_bits ; j++ ) {
+		*c = _mesa_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->visualType = GLX_DONT_CARE;
+		modes->renderType = GLX_RGBA_BIT;
+		modes->drawableType = GLX_WINDOW_BIT;
+		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->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 = modes->rgbMode ?
+		    __DRI_ATTRIB_TEXTURE_1D_BIT |
+		    __DRI_ATTRIB_TEXTURE_2D_BIT |
+		    __DRI_ATTRIB_TEXTURE_RECTANGLE_BIT :
+		    0;
+	    }
+	}
+    }
+    *c = NULL;
+
+    return configs;
+}
+
+const __DRIconfig **driConcatConfigs(__DRIconfig **a, __DRIconfig **b)
+{
+    const __DRIconfig **all;
+    int i, j, index;
+
+    i = 0;
+    while (a[i] != NULL)
+	i++;
+    j = 0;
+    while (b[j] != NULL)
+	j++;
+
+    all = _mesa_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;
+
+    _mesa_free(a);
+    _mesa_free(b);
+
+    return all;
+}
+
+#define __ATTRIB(attrib, field) \
+    { attrib, offsetof(__GLcontextModes, 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]))
+
+static int
+driGetConfigAttribIndex(const __DRIconfig *config,
+			unsigned int index, unsigned int *value)
+{
+    switch (attribMap[index].attrib) {
+    case __DRI_ATTRIB_RENDER_TYPE:
+	if (config->modes.rgbMode)
+	    *value = __DRI_ATTRIB_RGBA_BIT;
+	else
+	    *value = __DRI_ATTRIB_COLOR_INDEX_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:
+	break;
+
+    case __DRI_ATTRIB_FLOAT_MODE:
+        *value = config->modes.floatMode;
+        break;
+
+    default:
+	*value = *(unsigned int *)
+	    ((char *) &config->modes + attribMap[index].offset);
+
+	break;
+    }
+
+    return GL_TRUE;
+}
+
+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;
+}
+
+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;
+}