src/mesa/drivers/dri/common/utils.c

   1 /*
   2  * (C) Copyright IBM Corporation 2002, 2004
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * on the rights to use, copy, modify, merge, publish, distribute, sub
   9  * license, and/or sell copies of the Software, and to permit persons to whom
  10  * the Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  19  * VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  22  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file utils.c
  27  * Utility functions for DRI drivers.
  28  *
  29  * \author Ian Romanick <idr@us.ibm.com>
  30  */
  31
  32 #include <string.h>
  33 #include <stdlib.h>
  34 #include "mtypes.h"
  35 #include "extensions.h"
  36 #include "utils.h"
  37
  38 #if !defined( DRI_NEW_INTERFACE_ONLY )
  39 #include "xf86dri.h"        /* For XF86DRIQueryVersion prototype. */
  40 #endif
  41
  42 #if defined(USE_X86_ASM)
  43 #include "x86/common_x86_asm.h"
  44 #endif
  45
  46 #if defined(USE_PPC_ASM)
  47 #include "ppc/common_ppc_features.h"
  48 #endif
  49
  50 unsigned
  51 driParseDebugString( const char * debug,
  52                      const struct dri_debug_control * control  )
  53 {
  54    unsigned   flag;
  55
  56
  57    flag = 0;
  58    if ( debug != NULL ) {
  59       while( control->string != NULL ) {
  60          if ( !strcmp( debug, "all" ) ||
  61               strstr( debug, control->string ) != NULL ) {
  62             flag |= control->flag;
  63          }
  64
  65          control++;
  66       }
  67    }
  68
  69    return flag;
  70 }
  71
  72
  73
  74 /**
  75  * Create the \c GL_RENDERER string for DRI drivers.
  76  *
  77  * Almost all DRI drivers use a \c GL_RENDERER string of the form:
  78  *
  79  *    "Mesa DRI <chip> <driver date> <AGP speed) <CPU information>"
  80  *
  81  * Using the supplied chip name, driver data, and AGP speed, this function
  82  * creates the string.
  83  *
  84  * \param buffer         Buffer to hold the \c GL_RENDERER string.
  85  * \param hardware_name  Name of the hardware.
  86  * \param driver_date    Driver date.
  87  * \param agp_mode       AGP mode (speed).
  88  *
  89  * \returns
  90  * The length of the string stored in \c buffer.  This does \b not include
  91  * the terminating \c NUL character.
  92  */
  93 unsigned
  94 driGetRendererString( char * buffer, const char * hardware_name,
  95                       const char * driver_date, GLuint agp_mode )
  96 {
  97 #define MAX_INFO   4
  98    const char * cpu[MAX_INFO];
  99    unsigned   next = 0;
 100    unsigned   i;
 101    unsigned   offset;
 102
 103
 104    offset = sprintf( buffer, "Mesa DRI %s %s", hardware_name, driver_date );
 105
 106    /* Append any AGP-specific information.
 107     */
 108    switch ( agp_mode ) {
 109    case 1:
 110    case 2:
 111    case 4:
 112    case 8:
 113       offset += sprintf( & buffer[ offset ], " AGP %ux", agp_mode );
 114       break;
 115
 116    default:
 117       break;
 118    }
 119
 120    /* Append any CPU-specific information.
 121     */
 122 #ifdef USE_X86_ASM
 123    if ( _mesa_x86_cpu_features ) {
 124       cpu[next] = " x86";
 125       next++;
 126    }
 127 # ifdef USE_MMX_ASM
 128    if ( cpu_has_mmx ) {
 129       cpu[next] = (cpu_has_mmxext) ? "/MMX+" : "/MMX";
 130       next++;
 131    }
 132 # endif
 133 # ifdef USE_3DNOW_ASM
 134    if ( cpu_has_3dnow ) {
 135       cpu[next] = (cpu_has_3dnowext) ? "/3DNow!+" : "/3DNow!";
 136       next++;
 137    }
 138 # endif
 139 # ifdef USE_SSE_ASM
 140    if ( cpu_has_xmm ) {
 141       cpu[next] = (cpu_has_xmm2) ? "/SSE2" : "/SSE";
 142       next++;
 143    }
 144 # endif
 145
 146 #elif defined(USE_SPARC_ASM)
 147
 148    cpu[0] = " SPARC";
 149    next = 1;
 150
 151 #elif defined(USE_PPC_ASM)
 152    if ( _mesa_ppc_cpu_features ) {
 153       cpu[next] = (cpu_has_64) ? " PowerPC 64" : " PowerPC";
 154       next++;
 155    }
 156
 157 # ifdef USE_VMX_ASM
 158    if ( cpu_has_vmx ) {
 159       cpu[next] = "/Altivec";
 160       next++;
 161    }
 162 # endif
 163
 164    if ( ! cpu_has_fpu ) {
 165       cpu[next] = "/No FPU";
 166       next++;
 167    }
 168 #endif
 169
 170    for ( i = 0 ; i < next ; i++ ) {
 171       const size_t len = strlen( cpu[i] );
 172
 173       strncpy( & buffer[ offset ], cpu[i], len );
 174       offset += len;
 175    }
 176
 177    return offset;
 178 }
 179
 180
 181
 182
 183 void driInitExtensions( GLcontext * ctx,
 184                         const char * const extensions_to_enable[],
 185                         GLboolean  enable_imaging )
 186 {
 187    unsigned   i;
 188
 189    if ( enable_imaging ) {
 190       _mesa_enable_imaging_extensions( ctx );
 191    }
 192
 193    for ( i = 0 ; extensions_to_enable[i] != NULL ; i++ ) {
 194       _mesa_enable_extension( ctx, extensions_to_enable[i] );
 195    }
 196 }
 197
 198
 199
 200
 201 #ifndef DRI_NEW_INTERFACE_ONLY
 202 /**
 203  * Utility function used by drivers to test the verions of other components.
 204  *
 205  * \deprecated
 206  * All drivers using the new interface should use \c driCheckDriDdxVersions2
 207  * instead.  This function is implemented using a call that is not available
 208  * to drivers using the new interface.  Furthermore, the information gained
 209  * by this call (the DRI and DDX version information) is already provided to
 210  * the driver via the new interface.
 211  */
 212 GLboolean
 213 driCheckDriDdxDrmVersions(__DRIscreenPrivate *sPriv,
 214                           const char * driver_name,
 215                           int dri_major, int dri_minor,
 216                           int ddx_major, int ddx_minor,
 217                           int drm_major, int drm_minor)
 218 {
 219    static const char format[] = "%s DRI driver expected %s version %d.%d.x "
 220        "but got version %d.%d.%d";
 221    int major, minor, patch;
 222
 223    /* Check the DRI version */
 224    if (XF86DRIQueryVersion(sPriv->display, &major, &minor, &patch)) {
 225       if (major != dri_major || minor < dri_minor) {
 226          __driUtilMessage(format, driver_name, "DRI", dri_major, dri_minor,
 227                           major, minor, patch);
 228          return GL_FALSE;
 229       }
 230    }
 231
 232    /* Check that the DDX driver version is compatible */
 233    if (sPriv->ddxMajor != ddx_major || sPriv->ddxMinor < ddx_minor) {
 234       __driUtilMessage(format, driver_name, "DDX", ddx_major, ddx_minor,
 235                        sPriv->ddxMajor, sPriv->ddxMinor, sPriv->ddxPatch);
 236       return GL_FALSE;
 237    }
 238
 239    /* Check that the DRM driver version is compatible */
 240    if (sPriv->drmMajor != drm_major || sPriv->drmMinor < drm_minor) {
 241       __driUtilMessage(format, driver_name, "DRM", drm_major, drm_minor,
 242                        sPriv->drmMajor, sPriv->drmMinor, sPriv->drmPatch);
 243       return GL_FALSE;
 244    }
 245
 246    return GL_TRUE;
 247 }
 248 #endif /* DRI_NEW_INTERFACE_ONLY */
 249
 250 /**
 251  * Utility function used by drivers to test the verions of other components.
 252  *
 253  * If one of the version requirements is not met, a message is logged using
 254  * \c __driUtilMessage.
 255  *
 256  * \param driver_name  Name of the driver.  Used in error messages.
 257  * \param driActual    Actual DRI version supplied __driCreateNewScreen.
 258  * \param driExpected  Minimum DRI version required by the driver.
 259  * \param ddxActual    Actual DDX version supplied __driCreateNewScreen.
 260  * \param ddxExpected  Minimum DDX minor and range of DDX major version required by the driver.
 261  * \param drmActual    Actual DRM version supplied __driCreateNewScreen.
 262  * \param drmExpected  Minimum DRM version required by the driver.
 263  *
 264  * \returns \c GL_TRUE if all version requirements are met.  Otherwise,
 265  *          \c GL_FALSE is returned.
 266  *
 267  * \sa __driCreateNewScreen, driCheckDriDdxDrmVersions, __driUtilMessage
 268  */
 269 GLboolean
 270 driCheckDriDdxDrmVersions3(const char * driver_name,
 271                            const __DRIversion * driActual,
 272                            const __DRIversion * driExpected,
 273                            const __DRIversion * ddxActual,
 274                            const __DRIutilversion2 * ddxExpected,
 275                            const __DRIversion * drmActual,
 276                            const __DRIversion * drmExpected)
 277 {
 278    static const char format[] = "%s DRI driver expected %s version %d.%d.x "
 279        "but got version %d.%d.%d";
 280    static const char format2[] = "%s DRI driver expected %s version %d-%d.%d.x "
 281        "but got version %d.%d.%d";
 282
 283
 284    /* Check the DRI version */
 285    if ( (driActual->major != driExpected->major)
 286         || (driActual->minor < driExpected->minor) ) {
 287       __driUtilMessage(format, driver_name, "DRI",
 288                        driExpected->major, driExpected->minor,
 289                        driActual->major, driActual->minor, driActual->patch);
 290       return GL_FALSE;
 291    }
 292
 293    /* Check that the DDX driver version is compatible */
 294    if ( (ddxActual->major < ddxExpected->major_min)
 295         || (ddxActual->major > ddxExpected->major_max)
 296         || (ddxActual->minor < ddxExpected->minor) ) {
 297       __driUtilMessage(format2, driver_name, "DDX",
 298                        ddxExpected->major_min, ddxExpected->major_max, ddxExpected->minor,
 299                        ddxActual->major, ddxActual->minor, ddxActual->patch);
 300       return GL_FALSE;
 301    }
 302
 303    /* Check that the DRM driver version is compatible */
 304    if ( (drmActual->major != drmExpected->major)
 305         || (drmActual->minor < drmExpected->minor) ) {
 306       __driUtilMessage(format, driver_name, "DRM",
 307                        drmExpected->major, drmExpected->minor,
 308                        drmActual->major, drmActual->minor, drmActual->patch);
 309       return GL_FALSE;
 310    }
 311
 312    return GL_TRUE;
 313 }
 314
 315 GLboolean
 316 driCheckDriDdxDrmVersions2(const char * driver_name,
 317                            const __DRIversion * driActual,
 318                            const __DRIversion * driExpected,
 319                            const __DRIversion * ddxActual,
 320                            const __DRIversion * ddxExpected,
 321                            const __DRIversion * drmActual,
 322                            const __DRIversion * drmExpected)
 323 {
 324    __DRIutilversion2 ddx_expected;
 325    ddx_expected.major_min = ddxExpected->major;
 326    ddx_expected.major_max = ddxExpected->major;
 327    ddx_expected.minor = ddxExpected->minor;
 328    ddx_expected.patch = ddxExpected->patch;
 329    return driCheckDriDdxDrmVersions3(driver_name, driActual,
 330                                 driExpected, ddxActual, & ddx_expected,
 331                                 drmActual, drmExpected);
 332 }
 333
 334
 335
 336 GLboolean driClipRectToFramebuffer( const GLframebuffer *buffer,
 337                                     GLint *x, GLint *y,
 338                                     GLsizei *width, GLsizei *height )
 339 {
 340    /* left clipping */
 341    if (*x < buffer->_Xmin) {
 342       *width -= (buffer->_Xmin - *x);
 343       *x = buffer->_Xmin;
 344    }
 345
 346    /* right clipping */
 347    if (*x + *width > buffer->_Xmax)
 348       *width -= (*x + *width - buffer->_Xmax - 1);
 349
 350    if (*width <= 0)
 351       return GL_FALSE;
 352
 353    /* bottom clipping */
 354    if (*y < buffer->_Ymin) {
 355       *height -= (buffer->_Ymin - *y);
 356       *y = buffer->_Ymin;
 357    }
 358
 359    /* top clipping */
 360    if (*y + *height > buffer->_Ymax)
 361       *height -= (*y + *height - buffer->_Ymax - 1);
 362
 363    if (*height <= 0)
 364       return GL_FALSE;
 365
 366    return GL_TRUE;
 367 }
 368
 369
 370
 371 /**
 372  * Creates a set of \c __GLcontextModes that a driver will expose.
 373  *
 374  * A set of \c __GLcontextModes will be created based on the supplied
 375  * parameters.  The number of modes processed will be 2 *
 376  * \c num_depth_stencil_bits * \c num_db_modes.
 377  *
 378  * For the most part, data is just copied from \c depth_bits, \c stencil_bits,
 379  * \c db_modes, and \c visType into each \c __GLcontextModes element.
 380  * However, the meanings of \c fb_format and \c fb_type require further
 381  * explanation.  The \c fb_format specifies which color components are in
 382  * each pixel and what the default order is.  For example, \c GL_RGB specifies
 383  * that red, green, blue are available and red is in the "most significant"
 384  * position and blue is in the "least significant".  The \c fb_type specifies
 385  * the bit sizes of each component and the actual ordering.  For example, if
 386  * \c GL_UNSIGNED_SHORT_5_6_5_REV is specified with \c GL_RGB, bits [15:11]
 387  * are the blue value, bits [10:5] are the green value, and bits [4:0] are
 388  * the red value.
 389  *
 390  * One sublte issue is the combination of \c GL_RGB  or \c GL_BGR and either
 391  * of the \c GL_UNSIGNED_INT_8_8_8_8 modes.  The resulting mask values in the
 392  * \c __GLcontextModes structure is \b identical to the \c GL_RGBA or
 393  * \c GL_BGRA case, except the \c alphaMask is zero.  This means that, as
 394  * far as this routine is concerned, \c GL_RGB with \c GL_UNSIGNED_INT_8_8_8_8
 395  * still uses 32-bits.
 396  *
 397  * If in doubt, look at the tables used in the function.
 398  *
 399  * \param ptr_to_modes  Pointer to a pointer to a linked list of
 400  *                      \c __GLcontextModes.  Upon completion, a pointer to
 401  *                      the next element to be process will be stored here.
 402  *                      If the function fails and returns \c GL_FALSE, this
 403  *                      value will be unmodified, but some elements in the
 404  *                      linked list may be modified.
 405  * \param fb_format     Format of the framebuffer.  Currently only \c GL_RGB,
 406  *                      \c GL_RGBA, \c GL_BGR, and \c GL_BGRA are supported.
 407  * \param fb_type       Type of the pixels in the framebuffer.  Currently only
 408  *                      \c GL_UNSIGNED_SHORT_5_6_5,
 409  *                      \c GL_UNSIGNED_SHORT_5_6_5_REV,
 410  *                      \c GL_UNSIGNED_INT_8_8_8_8, and
 411  *                      \c GL_UNSIGNED_INT_8_8_8_8_REV are supported.
 412  * \param depth_bits    Array of depth buffer sizes to be exposed.
 413  * \param stencil_bits  Array of stencil buffer sizes to be exposed.
 414  * \param num_depth_stencil_bits  Number of entries in both \c depth_bits and
 415  *                      \c stencil_bits.
 416  * \param db_modes      Array of buffer swap modes.  If an element has a
 417  *                      value of \c GLX_NONE, then it represents a
 418  *                      single-buffered mode.  Other valid values are
 419  *                      \c GLX_SWAP_EXCHANGE_OML, \c GLX_SWAP_COPY_OML, and
 420  *                      \c GLX_SWAP_UNDEFINED_OML.  See the
 421  *                      GLX_OML_swap_method extension spec for more details.
 422  * \param num_db_modes  Number of entries in \c db_modes.
 423  * \param visType       GLX visual type.  Usually either \c GLX_TRUE_COLOR or
 424  *                      \c GLX_DIRECT_COLOR.
 425  *
 426  * \returns
 427  * \c GL_TRUE on success or \c GL_FALSE on failure.  Currently the only
 428  * cause of failure is a bad parameter (i.e., unsupported \c fb_format or
 429  * \c fb_type).
 430  *
 431  * \todo
 432  * There is currently no way to support packed RGB modes (i.e., modes with
 433  * exactly 3 bytes per pixel) or floating-point modes.  This could probably
 434  * be done by creating some new, private enums with clever names likes
 435  * \c GL_UNSIGNED_3BYTE_8_8_8, \c GL_4FLOAT_32_32_32_32,
 436  * \c GL_4HALF_16_16_16_16, etc.  We can cross that bridge when we come to it.
 437  */
 438 GLboolean
 439 driFillInModes( __GLcontextModes ** ptr_to_modes,
 440                 GLenum fb_format, GLenum fb_type,
 441                 const u_int8_t * depth_bits, const u_int8_t * stencil_bits,
 442                 unsigned num_depth_stencil_bits,
 443                 const GLenum * db_modes, unsigned num_db_modes,
 444                 int visType )
 445 {
 446    static const u_int8_t bits_table[3][4] = {
 447      /* R  G  B  A */
 448       { 5, 6, 5, 0 }, /* Any GL_UNSIGNED_SHORT_5_6_5 */
 449       { 8, 8, 8, 0 }, /* Any RGB with any GL_UNSIGNED_INT_8_8_8_8 */
 450       { 8, 8, 8, 8 }  /* Any RGBA with any GL_UNSIGNED_INT_8_8_8_8 */
 451    };
 452
 453    /* The following arrays are all indexed by the fb_type masked with 0x07.
 454     * Given the four supported fb_type values, this results in valid array
 455     * indices of 3, 4, 5, and 7.
 456     */
 457    static const u_int32_t masks_table_rgb[8][4] = {
 458       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 459       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 460       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 461       { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5       */
 462       { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5_REV   */
 463       { 0xFF000000, 0x00FF0000, 0x0000FF00, 0x00000000 }, /* 8_8_8_8     */
 464       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 465       { 0x000000FF, 0x0000FF00, 0x00FF0000, 0x00000000 }  /* 8_8_8_8_REV */
 466    };
 467
 468    static const u_int32_t masks_table_rgba[8][4] = {
 469       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 470       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 471       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 472       { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5       */
 473       { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5_REV   */
 474       { 0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF }, /* 8_8_8_8     */
 475       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 476       { 0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000 }, /* 8_8_8_8_REV */
 477    };
 478
 479    static const u_int32_t masks_table_bgr[8][4] = {
 480       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 481       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 482       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 483       { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5       */
 484       { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5_REV   */
 485       { 0x0000FF00, 0x00FF0000, 0xFF000000, 0x00000000 }, /* 8_8_8_8     */
 486       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 487       { 0x00FF0000, 0x0000FF00, 0x000000FF, 0x00000000 }, /* 8_8_8_8_REV */
 488    };
 489
 490    static const u_int32_t masks_table_bgra[8][4] = {
 491       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 492       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 493       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 494       { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5       */
 495       { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5_REV   */
 496       { 0x0000FF00, 0x00FF0000, 0xFF000000, 0x000000FF }, /* 8_8_8_8     */
 497       { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
 498       { 0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000 }, /* 8_8_8_8_REV */
 499    };
 500
 501    static const u_int8_t bytes_per_pixel[8] = {
 502       0, 0, 0, 2, 2, 4, 0, 4
 503    };
 504
 505    const u_int8_t  * bits;
 506    const u_int32_t * masks;
 507    const int index = fb_type & 0x07;
 508    __GLcontextModes * modes = *ptr_to_modes;
 509    unsigned i;
 510    unsigned j;
 511    unsigned k;
 512
 513
 514    if ( bytes_per_pixel[ index ] == 0 ) {
 515       fprintf( stderr, "[%s:%u] Framebuffer type 0x%04x has 0 bytes per pixel.\n",
 516                __FUNCTION__, __LINE__, fb_type );
 517       return GL_FALSE;
 518    }
 519
 520
 521    /* Valid types are GL_UNSIGNED_SHORT_5_6_5 and GL_UNSIGNED_INT_8_8_8_8 and
 522     * the _REV versions.
 523     *
 524     * Valid formats are GL_RGBA, GL_RGB, and GL_BGRA.
 525     */
 526
 527    switch ( fb_format ) {
 528       case GL_RGB:
 529          bits = (bytes_per_pixel[ index ] == 2)
 530              ? bits_table[0] : bits_table[1];
 531          masks = masks_table_rgb[ index ];
 532          break;
 533
 534       case GL_RGBA:
 535          bits = (bytes_per_pixel[ index ] == 2)
 536              ? bits_table[0] : bits_table[2];
 537          masks = masks_table_rgba[ index ];
 538          break;
 539
 540       case GL_BGR:
 541          bits = (bytes_per_pixel[ index ] == 2)
 542              ? bits_table[0] : bits_table[1];
 543          masks = masks_table_bgr[ index ];
 544          break;
 545
 546       case GL_BGRA:
 547          bits = (bytes_per_pixel[ index ] == 2)
 548              ? bits_table[0] : bits_table[2];
 549          masks = masks_table_bgra[ index ];
 550          break;
 551
 552       default:
 553          fprintf( stderr, "[%s:%u] Framebuffer format 0x%04x is not GL_RGB, GL_RGBA, GL_BGR, or GL_BGRA.\n",
 554                __FUNCTION__, __LINE__, fb_format );
 555          return GL_FALSE;
 556    }
 557
 558
 559     for ( k = 0 ; k < num_depth_stencil_bits ; k++ ) {
 560         for ( i = 0 ; i < num_db_modes ; i++ ) {
 561             for ( j = 0 ; j < 2 ; j++ ) {
 562
 563                 modes->redBits   = bits[0];
 564                 modes->greenBits = bits[1];
 565                 modes->blueBits  = bits[2];
 566                 modes->alphaBits = bits[3];
 567                 modes->redMask   = masks[0];
 568                 modes->greenMask = masks[1];
 569                 modes->blueMask  = masks[2];
 570                 modes->alphaMask = masks[3];
 571                 modes->rgbBits   = modes->redBits + modes->greenBits
 572                     + modes->blueBits + modes->alphaBits;
 573
 574                 modes->accumRedBits   = 16 * j;
 575                 modes->accumGreenBits = 16 * j;
 576                 modes->accumBlueBits  = 16 * j;
 577                 modes->accumAlphaBits = (masks[3] != 0) ? 16 * j : 0;
 578                 modes->visualRating = (j == 0) ? GLX_NONE : GLX_SLOW_CONFIG;
 579
 580                 modes->stencilBits = stencil_bits[k];
 581                 modes->depthBits = depth_bits[k];
 582
 583                 modes->visualType = visType;
 584                 modes->renderType = GLX_RGBA_BIT;
 585                 modes->drawableType = GLX_WINDOW_BIT;
 586                 modes->rgbMode = GL_TRUE;
 587
 588                 if ( db_modes[i] == GLX_NONE ) {
 589                     modes->doubleBufferMode = GL_FALSE;
 590                 }
 591                 else {
 592                     modes->doubleBufferMode = GL_TRUE;
 593                     modes->swapMethod = db_modes[i];
 594                 }
 595
 596                 modes->haveAccumBuffer = ((modes->accumRedBits +
 597                                            modes->accumGreenBits +
 598                                            modes->accumBlueBits +
 599                                            modes->accumAlphaBits) > 0);
 600                 modes->haveDepthBuffer = (modes->depthBits > 0);
 601                 modes->haveStencilBuffer = (modes->stencilBits > 0);
 602
 603                 modes = modes->next;
 604             }
 605         }
 606     }
 607
 608     *ptr_to_modes = modes;
 609     return GL_TRUE;
 610 }