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 "main/mtypes.h"
  35 #include "main/cpuinfo.h"
  36 #include "main/extensions.h"
  37 #include "utils.h"
  38
  39
  40 /**
  41  * Print message to \c stderr if the \c LIBGL_DEBUG environment variable
  42  * is set.
  43  *
  44  * Is called from the drivers.
  45  *
  46  * \param f \c printf like format string.
  47  */
  48 void
  49 __driUtilMessage(const char *f, ...)
  50 {
  51     va_list args;
  52
  53     if (getenv("LIBGL_DEBUG")) {
  54         fprintf(stderr, "libGL: ");
  55         va_start(args, f);
  56         vfprintf(stderr, f, args);
  57         va_end(args);
  58         fprintf(stderr, "\n");
  59     }
  60 }
  61
  62
  63 unsigned
  64 driParseDebugString( const char * debug,
  65                      const struct dri_debug_control * control  )
  66 {
  67    unsigned   flag;
  68
  69
  70    flag = 0;
  71    if ( debug != NULL ) {
  72       while( control->string != NULL ) {
  73          if ( !strcmp( debug, "all" ) ||
  74               strstr( debug, control->string ) != NULL ) {
  75             flag |= control->flag;
  76          }
  77
  78          control++;
  79       }
  80    }
  81
  82    return flag;
  83 }
  84
  85
  86
  87 /**
  88  * Create the \c GL_RENDERER string for DRI drivers.
  89  *
  90  * Almost all DRI drivers use a \c GL_RENDERER string of the form:
  91  *
  92  *    "Mesa DRI <chip> <driver date> <AGP speed) <CPU information>"
  93  *
  94  * Using the supplied chip name, driver data, and AGP speed, this function
  95  * creates the string.
  96  *
  97  * \param buffer         Buffer to hold the \c GL_RENDERER string.
  98  * \param hardware_name  Name of the hardware.
  99  * \param driver_date    Driver date.
 100  * \param agp_mode       AGP mode (speed).
 101  *
 102  * \returns
 103  * The length of the string stored in \c buffer.  This does \b not include
 104  * the terminating \c NUL character.
 105  */
 106 unsigned
 107 driGetRendererString( char * buffer, const char * hardware_name,
 108                       const char * driver_date, GLuint agp_mode )
 109 {
 110    unsigned offset;
 111    char *cpu;
 112
 113    offset = sprintf( buffer, "Mesa DRI %s %s", hardware_name, driver_date );
 114
 115    /* Append any AGP-specific information.
 116     */
 117    switch ( agp_mode ) {
 118    case 1:
 119    case 2:
 120    case 4:
 121    case 8:
 122       offset += sprintf( & buffer[ offset ], " AGP %ux", agp_mode );
 123       break;
 124
 125    default:
 126       break;
 127    }
 128
 129    /* Append any CPU-specific information.
 130     */
 131    cpu = _mesa_get_cpu_string();
 132    if (cpu) {
 133       offset += sprintf(buffer + offset, " %s", cpu);
 134       free(cpu);
 135    }
 136
 137    return offset;
 138 }
 139
 140
 141
 142
 143 #define need_GL_ARB_copy_buffer
 144 #define need_GL_ARB_draw_buffers
 145 #define need_GL_ARB_multisample
 146 #define need_GL_ARB_texture_compression
 147 #define need_GL_ARB_transpose_matrix
 148 #define need_GL_ARB_vertex_buffer_object
 149 #define need_GL_ARB_window_pos
 150 #define need_GL_EXT_compiled_vertex_array
 151 #define need_GL_EXT_multi_draw_arrays
 152 #define need_GL_EXT_polygon_offset
 153 #define need_GL_EXT_texture_object
 154 #define need_GL_EXT_vertex_array
 155 #define need_GL_IBM_multimode_draw_arrays
 156 #define need_GL_MESA_window_pos
 157
 158 /* These are needed in *all* drivers because Mesa internally implements
 159  * certain functionality in terms of functions provided by these extensions.
 160  * For example, glBlendFunc is implemented by calling glBlendFuncSeparateEXT.
 161  */
 162 #define need_GL_EXT_blend_func_separate
 163 #define need_GL_NV_vertex_program
 164
 165 #include "main/remap_helper.h"
 166
 167 static const struct dri_extension all_mesa_extensions[] = {
 168    { "GL_ARB_copy_buffer",           GL_ARB_copy_buffer_functions },
 169    { "GL_ARB_draw_buffers",          GL_ARB_draw_buffers_functions },
 170    { "GL_ARB_multisample",           GL_ARB_multisample_functions },
 171    { "GL_ARB_texture_compression",   GL_ARB_texture_compression_functions },
 172    { "GL_ARB_transpose_matrix",      GL_ARB_transpose_matrix_functions },
 173    { "GL_ARB_vertex_buffer_object",  GL_ARB_vertex_buffer_object_functions},
 174    { "GL_ARB_window_pos",            GL_ARB_window_pos_functions },
 175    { "GL_EXT_blend_func_separate",   GL_EXT_blend_func_separate_functions },
 176    { "GL_EXT_compiled_vertex_array", GL_EXT_compiled_vertex_array_functions },
 177    { "GL_EXT_multi_draw_arrays",     GL_EXT_multi_draw_arrays_functions },
 178    { "GL_EXT_polygon_offset",        GL_EXT_polygon_offset_functions },
 179    { "GL_EXT_texture_object",        GL_EXT_texture_object_functions },
 180    { "GL_EXT_vertex_array",          GL_EXT_vertex_array_functions },
 181    { "GL_IBM_multimode_draw_arrays", GL_IBM_multimode_draw_arrays_functions },
 182    { "GL_MESA_window_pos",           GL_MESA_window_pos_functions },
 183    { "GL_NV_vertex_program",         GL_NV_vertex_program_functions },
 184    { NULL,                           NULL }
 185 };
 186
 187
 188 /**
 189  * Enable and map extensions supported by the driver.
 190  *
 191  * When ctx is NULL, extensions are not enabled, but their functions
 192  * are still mapped.  When extensions_to_enable is NULL, all static
 193  * functions known to mesa core are mapped.
 194  *
 195  * \bug
 196  * ARB_imaging isn't handled properly.  In Mesa, enabling ARB_imaging also
 197  * enables all the sub-extensions that are folded into it.  This means that
 198  * we need to add entry-points (via \c driInitSingleExtension) for those
 199  * new functions here.
 200  */
 201 void driInitExtensions( struct gl_context * ctx,
 202                         const struct dri_extension * extensions_to_enable,
 203                         GLboolean enable_imaging )
 204 {
 205    static int first_time = 1;
 206    unsigned   i;
 207
 208    if ( first_time ) {
 209       first_time = 0;
 210       driInitExtensions( NULL, all_mesa_extensions, GL_FALSE );
 211    }
 212
 213    if ( (ctx != NULL) && enable_imaging ) {
 214       _mesa_enable_imaging_extensions( ctx );
 215    }
 216
 217    /* The caller is too lazy to list any extension */
 218    if ( extensions_to_enable == NULL ) {
 219       /* Map the static functions.  Together with those mapped by remap
 220        * table, this should cover everything mesa core knows.
 221        */
 222       _mesa_map_static_functions();
 223       return;
 224    }
 225
 226    for ( i = 0 ; extensions_to_enable[i].name != NULL ; i++ ) {
 227        driInitSingleExtension( ctx, & extensions_to_enable[i] );
 228    }
 229 }
 230
 231
 232
 233
 234 /**
 235  * Enable and map functions for a single extension
 236  *
 237  * \param ctx  Context where extension is to be enabled.
 238  * \param ext  Extension that is to be enabled.
 239  *
 240  * \sa driInitExtensions, _mesa_enable_extension, _mesa_map_function_array
 241  */
 242 void driInitSingleExtension( struct gl_context * ctx,
 243                              const struct dri_extension * ext )
 244 {
 245     if ( ext->functions != NULL ) {
 246        _mesa_map_function_array(ext->functions);
 247     }
 248
 249     if ( ctx != NULL ) {
 250         _mesa_enable_extension( ctx, ext->name );
 251     }
 252 }
 253
 254
 255 /**
 256  * Utility function used by drivers to test the verions of other components.
 257  *
 258  * \param driver_name  Name of the driver.  Used in error messages.
 259  * \param driActual    Actual DRI version supplied __driCreateNewScreen.
 260  * \param driExpected  Minimum DRI version required by the driver.
 261  * \param ddxActual    Actual DDX version supplied __driCreateNewScreen.
 262  * \param ddxExpected  Minimum DDX minor and range of DDX major version required by the driver.
 263  * \param drmActual    Actual DRM version supplied __driCreateNewScreen.
 264  * \param drmExpected  Minimum DRM version required by the driver.
 265  *
 266  * \returns \c GL_TRUE if all version requirements are met.  Otherwise,
 267  *          \c GL_FALSE is returned.
 268  *
 269  * \sa __driCreateNewScreen, driCheckDriDdxDrmVersions2
 270  *
 271  * \todo
 272  * Now that the old \c driCheckDriDdxDrmVersions function is gone, this
 273  * function and \c driCheckDriDdxDrmVersions2 should be renamed.
 274  */
 275 GLboolean
 276 driCheckDriDdxDrmVersions3(const char * driver_name,
 277                            const __DRIversion * driActual,
 278                            const __DRIversion * driExpected,
 279                            const __DRIversion * ddxActual,
 280                            const __DRIutilversion2 * ddxExpected,
 281                            const __DRIversion * drmActual,
 282                            const __DRIversion * drmExpected)
 283 {
 284    static const char format[] = "%s DRI driver expected %s version %d.%d.x "
 285        "but got version %d.%d.%d\n";
 286    static const char format2[] = "%s DRI driver expected %s version %d-%d.%d.x "
 287        "but got version %d.%d.%d\n";
 288
 289
 290    /* Check the DRI version */
 291    if ( (driActual->major != driExpected->major)
 292         || (driActual->minor < driExpected->minor) ) {
 293       fprintf(stderr, format, driver_name, "DRI",
 294                        driExpected->major, driExpected->minor,
 295                        driActual->major, driActual->minor, driActual->patch);
 296       return GL_FALSE;
 297    }
 298
 299    /* Check that the DDX driver version is compatible */
 300    if ( (ddxActual->major < ddxExpected->major_min)
 301         || (ddxActual->major > ddxExpected->major_max)
 302         || (ddxActual->minor < ddxExpected->minor) ) {
 303       fprintf(stderr, format2, driver_name, "DDX",
 304                        ddxExpected->major_min, ddxExpected->major_max, ddxExpected->minor,
 305                        ddxActual->major, ddxActual->minor, ddxActual->patch);
 306       return GL_FALSE;
 307    }
 308
 309    /* Check that the DRM driver version is compatible */
 310    if ( (drmActual->major != drmExpected->major)
 311         || (drmActual->minor < drmExpected->minor) ) {
 312       fprintf(stderr, format, driver_name, "DRM",
 313                        drmExpected->major, drmExpected->minor,
 314                        drmActual->major, drmActual->minor, drmActual->patch);
 315       return GL_FALSE;
 316    }
 317
 318    return GL_TRUE;
 319 }
 320
 321 GLboolean
 322 driCheckDriDdxDrmVersions2(const char * driver_name,
 323                            const __DRIversion * driActual,
 324                            const __DRIversion * driExpected,
 325                            const __DRIversion * ddxActual,
 326                            const __DRIversion * ddxExpected,
 327                            const __DRIversion * drmActual,
 328                            const __DRIversion * drmExpected)
 329 {
 330    __DRIutilversion2 ddx_expected;
 331    ddx_expected.major_min = ddxExpected->major;
 332    ddx_expected.major_max = ddxExpected->major;
 333    ddx_expected.minor = ddxExpected->minor;
 334    ddx_expected.patch = ddxExpected->patch;
 335    return driCheckDriDdxDrmVersions3(driver_name, driActual,
 336                                 driExpected, ddxActual, & ddx_expected,
 337                                 drmActual, drmExpected);
 338 }
 339
 340 GLboolean driClipRectToFramebuffer( const struct gl_framebuffer *buffer,
 341                                     GLint *x, GLint *y,
 342                                     GLsizei *width, GLsizei *height )
 343 {
 344    /* left clipping */
 345    if (*x < buffer->_Xmin) {
 346       *width -= (buffer->_Xmin - *x);
 347       *x = buffer->_Xmin;
 348    }
 349
 350    /* right clipping */
 351    if (*x + *width > buffer->_Xmax)
 352       *width -= (*x + *width - buffer->_Xmax - 1);
 353
 354    if (*width <= 0)
 355       return GL_FALSE;
 356
 357    /* bottom clipping */
 358    if (*y < buffer->_Ymin) {
 359       *height -= (buffer->_Ymin - *y);
 360       *y = buffer->_Ymin;
 361    }
 362
 363    /* top clipping */
 364    if (*y + *height > buffer->_Ymax)
 365       *height -= (*y + *height - buffer->_Ymax - 1);
 366
 367    if (*height <= 0)
 368       return GL_FALSE;
 369
 370    return GL_TRUE;
 371 }
 372
 373 /**
 374  * Creates a set of \c struct gl_config that a driver will expose.
 375  *
 376  * A set of \c struct gl_config will be created based on the supplied
 377  * parameters.  The number of modes processed will be 2 *
 378  * \c num_depth_stencil_bits * \c num_db_modes.
 379  *
 380  * For the most part, data is just copied from \c depth_bits, \c stencil_bits,
 381  * \c db_modes, and \c visType into each \c struct gl_config element.
 382  * However, the meanings of \c fb_format and \c fb_type require further
 383  * explanation.  The \c fb_format specifies which color components are in
 384  * each pixel and what the default order is.  For example, \c GL_RGB specifies
 385  * that red, green, blue are available and red is in the "most significant"
 386  * position and blue is in the "least significant".  The \c fb_type specifies
 387  * the bit sizes of each component and the actual ordering.  For example, if
 388  * \c GL_UNSIGNED_SHORT_5_6_5_REV is specified with \c GL_RGB, bits [15:11]
 389  * are the blue value, bits [10:5] are the green value, and bits [4:0] are
 390  * the red value.
 391  *
 392  * One sublte issue is the combination of \c GL_RGB  or \c GL_BGR and either
 393  * of the \c GL_UNSIGNED_INT_8_8_8_8 modes.  The resulting mask values in the
 394  * \c struct gl_config structure is \b identical to the \c GL_RGBA or
 395  * \c GL_BGRA case, except the \c alphaMask is zero.  This means that, as
 396  * far as this routine is concerned, \c GL_RGB with \c GL_UNSIGNED_INT_8_8_8_8
 397  * still uses 32-bits.
 398  *
 399  * If in doubt, look at the tables used in the function.
 400  *
 401  * \param ptr_to_modes  Pointer to a pointer to a linked list of
 402  *                      \c struct gl_config.  Upon completion, a pointer to
 403  *                      the next element to be process will be stored here.
 404  *                      If the function fails and returns \c GL_FALSE, this
 405  *                      value will be unmodified, but some elements in the
 406  *                      linked list may be modified.
 407  * \param fb_format     Format of the framebuffer.  Currently only \c GL_RGB,
 408  *                      \c GL_RGBA, \c GL_BGR, and \c GL_BGRA are supported.
 409  * \param fb_type       Type of the pixels in the framebuffer.  Currently only
 410  *                      \c GL_UNSIGNED_SHORT_5_6_5,
 411  *                      \c GL_UNSIGNED_SHORT_5_6_5_REV,
 412  *                      \c GL_UNSIGNED_INT_8_8_8_8, and
 413  *                      \c GL_UNSIGNED_INT_8_8_8_8_REV are supported.
 414  * \param depth_bits    Array of depth buffer sizes to be exposed.
 415  * \param stencil_bits  Array of stencil buffer sizes to be exposed.
 416  * \param num_depth_stencil_bits  Number of entries in both \c depth_bits and
 417  *                      \c stencil_bits.
 418  * \param db_modes      Array of buffer swap modes.  If an element has a
 419  *                      value of \c GLX_NONE, then it represents a
 420  *                      single-buffered mode.  Other valid values are
 421  *                      \c GLX_SWAP_EXCHANGE_OML, \c GLX_SWAP_COPY_OML, and
 422  *                      \c GLX_SWAP_UNDEFINED_OML.  See the
 423  *                      GLX_OML_swap_method extension spec for more details.
 424  * \param num_db_modes  Number of entries in \c db_modes.
 425  * \param msaa_samples  Array of msaa sample count. 0 represents a visual
 426  *                      without a multisample buffer.
 427  * \param num_msaa_modes Number of entries in \c msaa_samples.
 428  * \param visType       GLX visual type.  Usually either \c GLX_TRUE_COLOR or
 429  *                      \c GLX_DIRECT_COLOR.
 430  *
 431  * \returns
 432  * \c GL_TRUE on success or \c GL_FALSE on failure.  Currently the only
 433  * cause of failure is a bad parameter (i.e., unsupported \c fb_format or
 434  * \c fb_type).
 435  *
 436  * \todo
 437  * There is currently no way to support packed RGB modes (i.e., modes with
 438  * exactly 3 bytes per pixel) or floating-point modes.  This could probably
 439  * be done by creating some new, private enums with clever names likes
 440  * \c GL_UNSIGNED_3BYTE_8_8_8, \c GL_4FLOAT_32_32_32_32,
 441  * \c GL_4HALF_16_16_16_16, etc.  We can cross that bridge when we come to it.
 442  */
 443 __DRIconfig **
 444 driCreateConfigs(GLenum fb_format, GLenum fb_type,
 445                  const uint8_t * depth_bits, const uint8_t * stencil_bits,
 446                  unsigned num_depth_stencil_bits,
 447                  const GLenum * db_modes, unsigned num_db_modes,
 448                  const uint8_t * msaa_samples, unsigned num_msaa_modes,
 449                  GLboolean enable_accum)
 450 {
 451    static const uint8_t bits_table[4][4] = {
 452      /* R  G  B  A */
 453       { 3, 3, 2, 0 }, /* Any GL_UNSIGNED_BYTE_3_3_2 */
 454       { 5, 6, 5, 0 }, /* Any GL_UNSIGNED_SHORT_5_6_5 */
 455       { 8, 8, 8, 0 }, /* Any RGB with any GL_UNSIGNED_INT_8_8_8_8 */
 456       { 8, 8, 8, 8 }  /* Any RGBA with any GL_UNSIGNED_INT_8_8_8_8 */
 457    };
 458
 459    static const uint32_t masks_table_rgb[6][4] = {
 460       { 0x000000E0, 0x0000001C, 0x00000003, 0x00000000 }, /* 3_3_2       */
 461       { 0x00000007, 0x00000038, 0x000000C0, 0x00000000 }, /* 2_3_3_REV   */
 462       { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5       */
 463       { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5_REV   */
 464       { 0xFF000000, 0x00FF0000, 0x0000FF00, 0x00000000 }, /* 8_8_8_8     */
 465       { 0x000000FF, 0x0000FF00, 0x00FF0000, 0x00000000 }  /* 8_8_8_8_REV */
 466    };
 467
 468    static const uint32_t masks_table_rgba[6][4] = {
 469       { 0x000000E0, 0x0000001C, 0x00000003, 0x00000000 }, /* 3_3_2       */
 470       { 0x00000007, 0x00000038, 0x000000C0, 0x00000000 }, /* 2_3_3_REV   */
 471       { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5       */
 472       { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5_REV   */
 473       { 0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF }, /* 8_8_8_8     */
 474       { 0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000 }, /* 8_8_8_8_REV */
 475    };
 476
 477    static const uint32_t masks_table_bgr[6][4] = {
 478       { 0x00000007, 0x00000038, 0x000000C0, 0x00000000 }, /* 3_3_2       */
 479       { 0x000000E0, 0x0000001C, 0x00000003, 0x00000000 }, /* 2_3_3_REV   */
 480       { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5       */
 481       { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5_REV   */
 482       { 0x0000FF00, 0x00FF0000, 0xFF000000, 0x00000000 }, /* 8_8_8_8     */
 483       { 0x00FF0000, 0x0000FF00, 0x000000FF, 0x00000000 }, /* 8_8_8_8_REV */
 484    };
 485
 486    static const uint32_t masks_table_bgra[6][4] = {
 487       { 0x00000007, 0x00000038, 0x000000C0, 0x00000000 }, /* 3_3_2       */
 488       { 0x000000E0, 0x0000001C, 0x00000003, 0x00000000 }, /* 2_3_3_REV   */
 489       { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5       */
 490       { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5_REV   */
 491       { 0x0000FF00, 0x00FF0000, 0xFF000000, 0x000000FF }, /* 8_8_8_8     */
 492       { 0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000 }, /* 8_8_8_8_REV */
 493    };
 494
 495    static const uint8_t bytes_per_pixel[6] = {
 496       1, /* 3_3_2       */
 497       1, /* 2_3_3_REV   */
 498       2, /* 5_6_5       */
 499       2, /* 5_6_5_REV   */
 500       4, /* 8_8_8_8     */
 501       4  /* 8_8_8_8_REV */
 502    };
 503
 504    const uint8_t  * bits;
 505    const uint32_t * masks;
 506    int index;
 507    __DRIconfig **configs, **c;
 508    struct gl_config *modes;
 509    unsigned i, j, k, h;
 510    unsigned num_modes;
 511    unsigned num_accum_bits = (enable_accum) ? 2 : 1;
 512
 513    switch ( fb_type ) {
 514       case GL_UNSIGNED_BYTE_3_3_2:
 515          index = 0;
 516          break;
 517       case GL_UNSIGNED_BYTE_2_3_3_REV:
 518          index = 1;
 519          break;
 520       case GL_UNSIGNED_SHORT_5_6_5:
 521          index = 2;
 522          break;
 523       case GL_UNSIGNED_SHORT_5_6_5_REV:
 524          index = 3;
 525          break;
 526       case GL_UNSIGNED_INT_8_8_8_8:
 527          index = 4;
 528          break;
 529       case GL_UNSIGNED_INT_8_8_8_8_REV:
 530          index = 5;
 531          break;
 532       default:
 533          fprintf( stderr, "[%s:%u] Unknown framebuffer type 0x%04x.\n",
 534                __FUNCTION__, __LINE__, fb_type );
 535          return NULL;
 536    }
 537
 538
 539    /* Valid types are GL_UNSIGNED_SHORT_5_6_5 and GL_UNSIGNED_INT_8_8_8_8 and
 540     * the _REV versions.
 541     *
 542     * Valid formats are GL_RGBA, GL_RGB, and GL_BGRA.
 543     */
 544
 545    switch ( fb_format ) {
 546       case GL_RGB:
 547          masks = masks_table_rgb[ index ];
 548          break;
 549
 550       case GL_RGBA:
 551          masks = masks_table_rgba[ index ];
 552          break;
 553
 554       case GL_BGR:
 555          masks = masks_table_bgr[ index ];
 556          break;
 557
 558       case GL_BGRA:
 559          masks = masks_table_bgra[ index ];
 560          break;
 561
 562       default:
 563          fprintf( stderr, "[%s:%u] Unknown framebuffer format 0x%04x.\n",
 564                __FUNCTION__, __LINE__, fb_format );
 565          return NULL;
 566    }
 567
 568    switch ( bytes_per_pixel[ index ] ) {
 569       case 1:
 570          bits = bits_table[0];
 571          break;
 572       case 2:
 573          bits = bits_table[1];
 574          break;
 575       default:
 576          bits = ((fb_format == GL_RGB) || (fb_format == GL_BGR))
 577             ? bits_table[2]
 578             : bits_table[3];
 579          break;
 580    }
 581
 582    num_modes = num_depth_stencil_bits * num_db_modes * num_accum_bits * num_msaa_modes;
 583    configs = calloc(1, (num_modes + 1) * sizeof *configs);
 584    if (configs == NULL)
 585        return NULL;
 586
 587     c = configs;
 588     for ( k = 0 ; k < num_depth_stencil_bits ; k++ ) {
 589         for ( i = 0 ; i < num_db_modes ; i++ ) {
 590             for ( h = 0 ; h < num_msaa_modes; h++ ) {
 591                 for ( j = 0 ; j < num_accum_bits ; j++ ) {
 592                     *c = malloc (sizeof **c);
 593                     modes = &(*c)->modes;
 594                     c++;
 595
 596                     memset(modes, 0, sizeof *modes);
 597                     modes->redBits   = bits[0];
 598                     modes->greenBits = bits[1];
 599                     modes->blueBits  = bits[2];
 600                     modes->alphaBits = bits[3];
 601                     modes->redMask   = masks[0];
 602                     modes->greenMask = masks[1];
 603                     modes->blueMask  = masks[2];
 604                     modes->alphaMask = masks[3];
 605                     modes->rgbBits   = modes->redBits + modes->greenBits
 606                         + modes->blueBits + modes->alphaBits;
 607
 608                     modes->accumRedBits   = 16 * j;
 609                     modes->accumGreenBits = 16 * j;
 610                     modes->accumBlueBits  = 16 * j;
 611                     modes->accumAlphaBits = (masks[3] != 0) ? 16 * j : 0;
 612                     modes->visualRating = (j == 0) ? GLX_NONE : GLX_SLOW_CONFIG;
 613
 614                     modes->stencilBits = stencil_bits[k];
 615                     modes->depthBits = depth_bits[k];
 616
 617                     modes->transparentPixel = GLX_NONE;
 618                     modes->transparentRed = GLX_DONT_CARE;
 619                     modes->transparentGreen = GLX_DONT_CARE;
 620                     modes->transparentBlue = GLX_DONT_CARE;
 621                     modes->transparentAlpha = GLX_DONT_CARE;
 622                     modes->transparentIndex = GLX_DONT_CARE;
 623                     modes->rgbMode = GL_TRUE;
 624
 625                     if ( db_modes[i] == GLX_NONE ) {
 626                         modes->doubleBufferMode = GL_FALSE;
 627                     }
 628                     else {
 629                         modes->doubleBufferMode = GL_TRUE;
 630                         modes->swapMethod = db_modes[i];
 631                     }
 632
 633                     modes->samples = msaa_samples[h];
 634                     modes->sampleBuffers = modes->samples ? 1 : 0;
 635
 636
 637                     modes->haveAccumBuffer = ((modes->accumRedBits +
 638                                            modes->accumGreenBits +
 639                                            modes->accumBlueBits +
 640                                            modes->accumAlphaBits) > 0);
 641                     modes->haveDepthBuffer = (modes->depthBits > 0);
 642                     modes->haveStencilBuffer = (modes->stencilBits > 0);
 643
 644                     modes->bindToTextureRgb = GL_TRUE;
 645                     modes->bindToTextureRgba = GL_TRUE;
 646                     modes->bindToMipmapTexture = GL_FALSE;
 647                     modes->bindToTextureTargets =
 648                         __DRI_ATTRIB_TEXTURE_1D_BIT |
 649                         __DRI_ATTRIB_TEXTURE_2D_BIT |
 650                         __DRI_ATTRIB_TEXTURE_RECTANGLE_BIT;
 651                 }
 652             }
 653         }
 654     }
 655     *c = NULL;
 656
 657     return configs;
 658 }
 659
 660 __DRIconfig **driConcatConfigs(__DRIconfig **a,
 661                                __DRIconfig **b)
 662 {
 663     __DRIconfig **all;
 664     int i, j, index;
 665
 666     i = 0;
 667     while (a[i] != NULL)
 668         i++;
 669     j = 0;
 670     while (b[j] != NULL)
 671         j++;
 672
 673     all = malloc((i + j + 1) * sizeof *all);
 674     index = 0;
 675     for (i = 0; a[i] != NULL; i++)
 676         all[index++] = a[i];
 677     for (j = 0; b[j] != NULL; j++)
 678         all[index++] = b[j];
 679     all[index++] = NULL;
 680
 681     free(a);
 682     free(b);
 683
 684     return all;
 685 }
 686
 687 #define __ATTRIB(attrib, field) \
 688     { attrib, offsetof(struct gl_config, field) }
 689
 690 static const struct { unsigned int attrib, offset; } attribMap[] = {
 691     __ATTRIB(__DRI_ATTRIB_BUFFER_SIZE,                  rgbBits),
 692     __ATTRIB(__DRI_ATTRIB_LEVEL,                        level),
 693     __ATTRIB(__DRI_ATTRIB_RED_SIZE,                     redBits),
 694     __ATTRIB(__DRI_ATTRIB_GREEN_SIZE,                   greenBits),
 695     __ATTRIB(__DRI_ATTRIB_BLUE_SIZE,                    blueBits),
 696     __ATTRIB(__DRI_ATTRIB_ALPHA_SIZE,                   alphaBits),
 697     __ATTRIB(__DRI_ATTRIB_DEPTH_SIZE,                   depthBits),
 698     __ATTRIB(__DRI_ATTRIB_STENCIL_SIZE,                 stencilBits),
 699     __ATTRIB(__DRI_ATTRIB_ACCUM_RED_SIZE,               accumRedBits),
 700     __ATTRIB(__DRI_ATTRIB_ACCUM_GREEN_SIZE,             accumGreenBits),
 701     __ATTRIB(__DRI_ATTRIB_ACCUM_BLUE_SIZE,              accumBlueBits),
 702     __ATTRIB(__DRI_ATTRIB_ACCUM_ALPHA_SIZE,             accumAlphaBits),
 703     __ATTRIB(__DRI_ATTRIB_SAMPLE_BUFFERS,               sampleBuffers),
 704     __ATTRIB(__DRI_ATTRIB_SAMPLES,                      samples),
 705     __ATTRIB(__DRI_ATTRIB_DOUBLE_BUFFER,                doubleBufferMode),
 706     __ATTRIB(__DRI_ATTRIB_STEREO,                       stereoMode),
 707     __ATTRIB(__DRI_ATTRIB_AUX_BUFFERS,                  numAuxBuffers),
 708     __ATTRIB(__DRI_ATTRIB_TRANSPARENT_TYPE,             transparentPixel),
 709     __ATTRIB(__DRI_ATTRIB_TRANSPARENT_INDEX_VALUE,      transparentPixel),
 710     __ATTRIB(__DRI_ATTRIB_TRANSPARENT_RED_VALUE,        transparentRed),
 711     __ATTRIB(__DRI_ATTRIB_TRANSPARENT_GREEN_VALUE,      transparentGreen),
 712     __ATTRIB(__DRI_ATTRIB_TRANSPARENT_BLUE_VALUE,       transparentBlue),
 713     __ATTRIB(__DRI_ATTRIB_TRANSPARENT_ALPHA_VALUE,      transparentAlpha),
 714     __ATTRIB(__DRI_ATTRIB_FLOAT_MODE,                   floatMode),
 715     __ATTRIB(__DRI_ATTRIB_RED_MASK,                     redMask),
 716     __ATTRIB(__DRI_ATTRIB_GREEN_MASK,                   greenMask),
 717     __ATTRIB(__DRI_ATTRIB_BLUE_MASK,                    blueMask),
 718     __ATTRIB(__DRI_ATTRIB_ALPHA_MASK,                   alphaMask),
 719     __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_WIDTH,            maxPbufferWidth),
 720     __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_HEIGHT,           maxPbufferHeight),
 721     __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_PIXELS,           maxPbufferPixels),
 722     __ATTRIB(__DRI_ATTRIB_OPTIMAL_PBUFFER_WIDTH,        optimalPbufferWidth),
 723     __ATTRIB(__DRI_ATTRIB_OPTIMAL_PBUFFER_HEIGHT,       optimalPbufferHeight),
 724     __ATTRIB(__DRI_ATTRIB_SWAP_METHOD,                  swapMethod),
 725     __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_RGB,          bindToTextureRgb),
 726     __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_RGBA,         bindToTextureRgba),
 727     __ATTRIB(__DRI_ATTRIB_BIND_TO_MIPMAP_TEXTURE,       bindToMipmapTexture),
 728     __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_TARGETS,      bindToTextureTargets),
 729     __ATTRIB(__DRI_ATTRIB_YINVERTED,                    yInverted),
 730
 731     /* The struct field doesn't matter here, these are handled by the
 732      * switch in driGetConfigAttribIndex.  We need them in the array
 733      * so the iterator includes them though.*/
 734     __ATTRIB(__DRI_ATTRIB_RENDER_TYPE,                  level),
 735     __ATTRIB(__DRI_ATTRIB_CONFIG_CAVEAT,                level),
 736     __ATTRIB(__DRI_ATTRIB_SWAP_METHOD,                  level)
 737 };
 738
 739 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
 740
 741
 742 /**
 743  * Return the value of a configuration attribute.  The attribute is
 744  * indicated by the index.
 745  */
 746 static int
 747 driGetConfigAttribIndex(const __DRIconfig *config,
 748                         unsigned int index, unsigned int *value)
 749 {
 750     switch (attribMap[index].attrib) {
 751     case __DRI_ATTRIB_RENDER_TYPE:
 752         /* no support for color index mode */
 753         *value = __DRI_ATTRIB_RGBA_BIT;
 754         break;
 755     case __DRI_ATTRIB_CONFIG_CAVEAT:
 756         if (config->modes.visualRating == GLX_NON_CONFORMANT_CONFIG)
 757             *value = __DRI_ATTRIB_NON_CONFORMANT_CONFIG;
 758         else if (config->modes.visualRating == GLX_SLOW_CONFIG)
 759             *value = __DRI_ATTRIB_SLOW_BIT;
 760         else
 761             *value = 0;
 762         break;
 763     case __DRI_ATTRIB_SWAP_METHOD:
 764         /* XXX no return value??? */
 765         break;
 766
 767     case __DRI_ATTRIB_FLOAT_MODE:
 768         /* this field is not int-sized */
 769         *value = config->modes.floatMode;
 770         break;
 771
 772     default:
 773         /* any other int-sized field */
 774         *value = *(unsigned int *)
 775             ((char *) &config->modes + attribMap[index].offset);
 776
 777         break;
 778     }
 779
 780     return GL_TRUE;
 781 }
 782
 783
 784 /**
 785  * Get the value of a configuration attribute.
 786  * \param attrib  the attribute (one of the _DRI_ATTRIB_x tokens)
 787  * \param value  returns the attribute's value
 788  * \return 1 for success, 0 for failure
 789  */
 790 int
 791 driGetConfigAttrib(const __DRIconfig *config,
 792                    unsigned int attrib, unsigned int *value)
 793 {
 794     int i;
 795
 796     for (i = 0; i < ARRAY_SIZE(attribMap); i++)
 797         if (attribMap[i].attrib == attrib)
 798             return driGetConfigAttribIndex(config, i, value);
 799
 800     return GL_FALSE;
 801 }
 802
 803
 804 /**
 805  * Get a configuration attribute name and value, given an index.
 806  * \param index  which field of the __DRIconfig to query
 807  * \param attrib  returns the attribute name (one of the _DRI_ATTRIB_x tokens)
 808  * \param value  returns the attribute's value
 809  * \return 1 for success, 0 for failure
 810  */
 811 int
 812 driIndexConfigAttrib(const __DRIconfig *config, int index,
 813                      unsigned int *attrib, unsigned int *value)
 814 {
 815     if (index >= 0 && index < ARRAY_SIZE(attribMap)) {
 816         *attrib = attribMap[index].attrib;
 817         return driGetConfigAttribIndex(config, index, value);
 818     }
 819
 820     return GL_FALSE;
 821 }