src/gallium/drivers/r300/r300_screen.c

   1 /*
   2  * Copyright 2008 Corbin Simpson <MostAwesomeDude@gmail.com>
   3  * Copyright 2010 Marek Olšák <maraeo@gmail.com>
   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  * THE AUTHOR(S) 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 #include "util/u_format.h"
  25 #include "util/u_format_s3tc.h"
  26 #include "util/u_memory.h"
  27 #include "os/os_time.h"
  28 #include "vl/vl_decoder.h"
  29 #include "vl/vl_video_buffer.h"
  30
  31 #include "r300_context.h"
  32 #include "r300_texture.h"
  33 #include "r300_screen_buffer.h"
  34 #include "r300_state_inlines.h"
  35 #include "r300_public.h"
  36
  37 #include "draw/draw_context.h"
  38
  39 /* Return the identifier behind whom the brave coders responsible for this
  40  * amalgamation of code, sweat, and duct tape, routinely obscure their names.
  41  *
  42  * ...I should have just put "Corbin Simpson", but I'm not that cool.
  43  *
  44  * (Or egotistical. Yet.) */
  45 static const char* r300_get_vendor(struct pipe_screen* pscreen)
  46 {
  47     return "X.Org R300 Project";
  48 }
  49
  50 static const char* chip_families[] = {
  51     "ATI R300",
  52     "ATI R350",
  53     "ATI RV350",
  54     "ATI RV370",
  55     "ATI RV380",
  56     "ATI RS400",
  57     "ATI RC410",
  58     "ATI RS480",
  59     "ATI R420",
  60     "ATI R423",
  61     "ATI R430",
  62     "ATI R480",
  63     "ATI R481",
  64     "ATI RV410",
  65     "ATI RS600",
  66     "ATI RS690",
  67     "ATI RS740",
  68     "ATI RV515",
  69     "ATI R520",
  70     "ATI RV530",
  71     "ATI R580",
  72     "ATI RV560",
  73     "ATI RV570"
  74 };
  75
  76 static const char* r300_get_name(struct pipe_screen* pscreen)
  77 {
  78     struct r300_screen* r300screen = r300_screen(pscreen);
  79
  80     return chip_families[r300screen->caps.family];
  81 }
  82
  83 static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
  84 {
  85     struct r300_screen* r300screen = r300_screen(pscreen);
  86     boolean is_r500 = r300screen->caps.is_r500;
  87
  88     switch (param) {
  89         /* Supported features (boolean caps). */
  90         case PIPE_CAP_NPOT_TEXTURES:
  91         case PIPE_CAP_TWO_SIDED_STENCIL:
  92         case PIPE_CAP_GLSL:
  93             /* I'll be frank. This is a lie.
  94              *
  95              * We don't truly support GLSL on any of this driver's chipsets.
  96              * To be fair, no chipset supports the full GLSL specification
  97              * to the best of our knowledge, but some of the less esoteric
  98              * features are still missing here.
  99              *
 100              * Rather than cripple ourselves intentionally, I'm going to set
 101              * this flag, and as Gallium's interface continues to change, I
 102              * hope that this single monolithic GLSL enable can slowly get
 103              * split down into many different pieces and the state tracker
 104              * will handle fallbacks transparently, like it should.
 105              *
 106              * ~ C.
 107              */
 108         case PIPE_CAP_ANISOTROPIC_FILTER:
 109         case PIPE_CAP_POINT_SPRITE:
 110         case PIPE_CAP_OCCLUSION_QUERY:
 111         case PIPE_CAP_TEXTURE_SHADOW_MAP:
 112         case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
 113         case PIPE_CAP_TEXTURE_MIRROR_REPEAT:
 114         case PIPE_CAP_BLEND_EQUATION_SEPARATE:
 115         case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
 116         case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
 117         case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
 118             return 1;
 119
 120         /* r300 cannot do swizzling of compressed textures. Supported otherwise. */
 121         case PIPE_CAP_TEXTURE_SWIZZLE:
 122             return util_format_s3tc_enabled ? r300screen->caps.dxtc_swizzle : 1;
 123
 124         /* Supported on r500 only. */
 125         case PIPE_CAP_FRAGMENT_COLOR_CLAMP_CONTROL:
 126         case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
 127         case PIPE_CAP_SM3:
 128             return is_r500 ? 1 : 0;
 129
 130         /* Unsupported features. */
 131         case PIPE_CAP_TIMER_QUERY:
 132         case PIPE_CAP_DUAL_SOURCE_BLEND:
 133         case PIPE_CAP_INDEP_BLEND_ENABLE:
 134         case PIPE_CAP_INDEP_BLEND_FUNC:
 135         case PIPE_CAP_DEPTH_CLAMP:
 136         case PIPE_CAP_DEPTHSTENCIL_CLEAR_SEPARATE:
 137         case PIPE_CAP_SHADER_STENCIL_EXPORT:
 138         case PIPE_CAP_ARRAY_TEXTURES:
 139         case PIPE_CAP_TGSI_INSTANCEID:
 140         case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
 141         case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
 142         case PIPE_CAP_MAX_VERTEX_TEXTURE_UNITS:
 143         case PIPE_CAP_SEAMLESS_CUBE_MAP:
 144         case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
 145             return 0;
 146
 147         /* SWTCL-only features. */
 148         case PIPE_CAP_STREAM_OUTPUT:
 149         case PIPE_CAP_PRIMITIVE_RESTART:
 150             return !r300screen->caps.has_tcl;
 151
 152         /* Texturing. */
 153         case PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS:
 154         case PIPE_CAP_MAX_COMBINED_SAMPLERS:
 155             return r300screen->caps.num_tex_units;
 156         case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
 157         case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
 158         case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
 159             /* 13 == 4096, 12 == 2048 */
 160             return is_r500 ? 13 : 12;
 161
 162         /* Render targets. */
 163         case PIPE_CAP_MAX_RENDER_TARGETS:
 164             return 4;
 165
 166         default:
 167             debug_printf("r300: Warning: Unknown CAP %d in get_param.\n",
 168                          param);
 169             return 0;
 170     }
 171 }
 172
 173 static int r300_get_shader_param(struct pipe_screen *pscreen, unsigned shader, enum pipe_shader_cap param)
 174 {
 175    struct r300_screen* r300screen = r300_screen(pscreen);
 176    boolean is_r400 = r300screen->caps.is_r400;
 177    boolean is_r500 = r300screen->caps.is_r500;
 178
 179    switch (shader)
 180     {
 181     case PIPE_SHADER_FRAGMENT:
 182         switch (param)
 183         {
 184         case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
 185             return is_r500 || is_r400 ? 512 : 96;
 186         case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
 187             return is_r500 || is_r400 ? 512 : 64;
 188         case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
 189             return is_r500 || is_r400 ? 512 : 32;
 190         case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
 191             return is_r500 ? 511 : 4;
 192         case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
 193             return is_r500 ? 64 : 0; /* Actually unlimited on r500. */
 194             /* Fragment shader limits. */
 195         case PIPE_SHADER_CAP_MAX_INPUTS:
 196             /* 2 colors + 8 texcoords are always supported
 197              * (minus fog and wpos).
 198              *
 199              * R500 has the ability to turn 3rd and 4th color into
 200              * additional texcoords but there is no two-sided color
 201              * selection then. However the facing bit can be used instead. */
 202             return 10;
 203         case PIPE_SHADER_CAP_MAX_CONSTS:
 204             return is_r500 ? 256 : 32;
 205         case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
 206             return 1;
 207         case PIPE_SHADER_CAP_MAX_TEMPS:
 208             return is_r500 ? 128 : is_r400 ? 64 : 32;
 209         case PIPE_SHADER_CAP_MAX_ADDRS:
 210             return 0;
 211         case PIPE_SHADER_CAP_MAX_PREDS:
 212             return is_r500 ? 1 : 0;
 213         case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
 214             return 0;
 215         case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
 216         case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
 217         case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
 218         case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
 219             return 0;
 220         case PIPE_SHADER_CAP_SUBROUTINES:
 221             return 0;
 222         }
 223         break;
 224     case PIPE_SHADER_VERTEX:
 225         if (!r300screen->caps.has_tcl) {
 226             return draw_get_shader_param(shader, param);
 227         }
 228
 229         switch (param)
 230         {
 231         case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
 232         case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
 233             return is_r500 ? 1024 : 256;
 234         case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
 235         case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
 236             return 0;
 237         case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
 238             return is_r500 ? 4 : 0; /* For loops; not sure about conditionals. */
 239         case PIPE_SHADER_CAP_MAX_INPUTS:
 240             return 16;
 241         case PIPE_SHADER_CAP_MAX_CONSTS:
 242             return 256;
 243         case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
 244             return 1;
 245         case PIPE_SHADER_CAP_MAX_TEMPS:
 246             return 32;
 247         case PIPE_SHADER_CAP_MAX_ADDRS:
 248             return 1; /* XXX guessed */
 249         case PIPE_SHADER_CAP_MAX_PREDS:
 250             return is_r500 ? 4 : 0; /* XXX guessed. */
 251         case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
 252             return 0;
 253         case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
 254         case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
 255         case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
 256             return 0;
 257         case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
 258             return 1;
 259         case PIPE_SHADER_CAP_SUBROUTINES:
 260             return 0;
 261         case PIPE_SHADER_CAP_INTEGERS:
 262             return 0;
 263         default:
 264             break;
 265         }
 266         break;
 267     default:
 268         break;
 269     }
 270     return 0;
 271 }
 272
 273 static float r300_get_paramf(struct pipe_screen* pscreen, enum pipe_cap param)
 274 {
 275     struct r300_screen* r300screen = r300_screen(pscreen);
 276
 277     switch (param) {
 278         case PIPE_CAP_MAX_LINE_WIDTH:
 279         case PIPE_CAP_MAX_LINE_WIDTH_AA:
 280         case PIPE_CAP_MAX_POINT_WIDTH:
 281         case PIPE_CAP_MAX_POINT_WIDTH_AA:
 282             /* The maximum dimensions of the colorbuffer are our practical
 283              * rendering limits. 2048 pixels should be enough for anybody. */
 284             if (r300screen->caps.is_r500) {
 285                 return 4096.0f;
 286             } else if (r300screen->caps.is_r400) {
 287                 return 4021.0f;
 288             } else {
 289                 return 2560.0f;
 290             }
 291         case PIPE_CAP_MAX_TEXTURE_ANISOTROPY:
 292             return 16.0f;
 293         case PIPE_CAP_MAX_TEXTURE_LOD_BIAS:
 294             return 16.0f;
 295         case PIPE_CAP_GUARD_BAND_LEFT:
 296         case PIPE_CAP_GUARD_BAND_TOP:
 297         case PIPE_CAP_GUARD_BAND_RIGHT:
 298         case PIPE_CAP_GUARD_BAND_BOTTOM:
 299             /* XXX I don't know what these should be but the least we can do is
 300              * silence the potential error message */
 301             return 0.0f;
 302         default:
 303             debug_printf("r300: Warning: Unknown CAP %d in get_paramf.\n",
 304                          param);
 305             return 0.0f;
 306     }
 307 }
 308
 309 static int r300_get_video_param(struct pipe_screen *screen,
 310                                 enum pipe_video_profile profile,
 311                                 enum pipe_video_cap param)
 312 {
 313    switch (param) {
 314       case PIPE_VIDEO_CAP_SUPPORTED:
 315          return vl_profile_supported(screen, profile);
 316       case PIPE_VIDEO_CAP_NPOT_TEXTURES:
 317          return 0;
 318       case PIPE_VIDEO_CAP_MAX_WIDTH:
 319       case PIPE_VIDEO_CAP_MAX_HEIGHT:
 320          return vl_video_buffer_max_size(screen);
 321       default:
 322          return 0;
 323    }
 324 }
 325
 326 static boolean r300_is_format_supported(struct pipe_screen* screen,
 327                                         enum pipe_format format,
 328                                         enum pipe_texture_target target,
 329                                         unsigned sample_count,
 330                                         unsigned usage)
 331 {
 332     uint32_t retval = 0;
 333     boolean drm_2_8_0 = r300_screen(screen)->info.drm_minor >= 8;
 334     boolean is_r500 = r300_screen(screen)->caps.is_r500;
 335     boolean is_r400 = r300_screen(screen)->caps.is_r400;
 336     boolean is_color2101010 = format == PIPE_FORMAT_R10G10B10A2_UNORM ||
 337                               format == PIPE_FORMAT_R10G10B10X2_SNORM ||
 338                               format == PIPE_FORMAT_B10G10R10A2_UNORM ||
 339                               format == PIPE_FORMAT_R10SG10SB10SA2U_NORM;
 340     boolean is_ati1n = format == PIPE_FORMAT_RGTC1_UNORM ||
 341                        format == PIPE_FORMAT_RGTC1_SNORM ||
 342                        format == PIPE_FORMAT_LATC1_UNORM ||
 343                        format == PIPE_FORMAT_LATC1_SNORM;
 344     boolean is_ati2n = format == PIPE_FORMAT_RGTC2_UNORM ||
 345                        format == PIPE_FORMAT_RGTC2_SNORM ||
 346                        format == PIPE_FORMAT_LATC2_UNORM ||
 347                        format == PIPE_FORMAT_LATC2_SNORM;
 348     boolean is_x16f_xy16f = format == PIPE_FORMAT_R16_FLOAT ||
 349                             format == PIPE_FORMAT_R16G16_FLOAT ||
 350                             format == PIPE_FORMAT_A16_FLOAT ||
 351                             format == PIPE_FORMAT_L16_FLOAT ||
 352                             format == PIPE_FORMAT_L16A16_FLOAT ||
 353                             format == PIPE_FORMAT_I16_FLOAT;
 354     boolean is_half_float = format == PIPE_FORMAT_R16_FLOAT ||
 355                             format == PIPE_FORMAT_R16G16_FLOAT ||
 356                             format == PIPE_FORMAT_R16G16B16_FLOAT ||
 357                             format == PIPE_FORMAT_R16G16B16A16_FLOAT;
 358
 359     if (!util_format_is_supported(format, usage))
 360        return FALSE;
 361
 362     /* Check multisampling support. */
 363     switch (sample_count) {
 364         case 0:
 365         case 1:
 366             break;
 367         case 2:
 368         case 3:
 369         case 4:
 370         case 6:
 371             return FALSE;
 372 #if 0
 373             if (usage != PIPE_BIND_RENDER_TARGET ||
 374                 !util_format_is_rgba8_variant(
 375                     util_format_description(format))) {
 376                 return FALSE;
 377             }
 378 #endif
 379             break;
 380         default:
 381             return FALSE;
 382     }
 383
 384     /* Check sampler format support. */
 385     if ((usage & PIPE_BIND_SAMPLER_VIEW) &&
 386         /* ATI1N is r5xx-only. */
 387         (is_r500 || !is_ati1n) &&
 388         /* ATI2N is supported on r4xx-r5xx. */
 389         (is_r400 || is_r500 || !is_ati2n) &&
 390         /* R16F and RG16F texture support was added in as late as DRM 2.8.0 */
 391         (drm_2_8_0 || !is_x16f_xy16f) &&
 392         r300_is_sampler_format_supported(format)) {
 393         retval |= PIPE_BIND_SAMPLER_VIEW;
 394     }
 395
 396     /* Check colorbuffer format support. */
 397     if ((usage & (PIPE_BIND_RENDER_TARGET |
 398                   PIPE_BIND_DISPLAY_TARGET |
 399                   PIPE_BIND_SCANOUT |
 400                   PIPE_BIND_SHARED)) &&
 401         /* 2101010 cannot be rendered to on non-r5xx. */
 402         (!is_color2101010 || (is_r500 && drm_2_8_0)) &&
 403         r300_is_colorbuffer_format_supported(format)) {
 404         retval |= usage &
 405             (PIPE_BIND_RENDER_TARGET |
 406              PIPE_BIND_DISPLAY_TARGET |
 407              PIPE_BIND_SCANOUT |
 408              PIPE_BIND_SHARED);
 409     }
 410
 411     /* Check depth-stencil format support. */
 412     if (usage & PIPE_BIND_DEPTH_STENCIL &&
 413         r300_is_zs_format_supported(format)) {
 414         retval |= PIPE_BIND_DEPTH_STENCIL;
 415     }
 416
 417     /* Check vertex buffer format support. */
 418     if (usage & PIPE_BIND_VERTEX_BUFFER &&
 419         /* Half float is supported on >= RV350. */
 420         (is_r400 || is_r500 || !is_half_float) &&
 421         r300_translate_vertex_data_type(format) != R300_INVALID_FORMAT) {
 422         retval |= PIPE_BIND_VERTEX_BUFFER;
 423     }
 424
 425     /* Transfers are always supported. */
 426     if (usage & PIPE_BIND_TRANSFER_READ)
 427         retval |= PIPE_BIND_TRANSFER_READ;
 428     if (usage & PIPE_BIND_TRANSFER_WRITE)
 429         retval |= PIPE_BIND_TRANSFER_WRITE;
 430
 431     return retval == usage;
 432 }
 433
 434 static void r300_destroy_screen(struct pipe_screen* pscreen)
 435 {
 436     struct r300_screen* r300screen = r300_screen(pscreen);
 437     struct radeon_winsys *rws = radeon_winsys(pscreen);
 438
 439     util_slab_destroy(&r300screen->pool_buffers);
 440     pipe_mutex_destroy(r300screen->num_contexts_mutex);
 441
 442     if (rws)
 443       rws->destroy(rws);
 444
 445     FREE(r300screen);
 446 }
 447
 448 static void r300_fence_reference(struct pipe_screen *screen,
 449                                  struct pipe_fence_handle **ptr,
 450                                  struct pipe_fence_handle *fence)
 451 {
 452     pb_reference((struct pb_buffer**)ptr,
 453                              (struct pb_buffer*)fence);
 454 }
 455
 456 static boolean r300_fence_signalled(struct pipe_screen *screen,
 457                                     struct pipe_fence_handle *fence)
 458 {
 459     struct radeon_winsys *rws = r300_screen(screen)->rws;
 460     struct pb_buffer *rfence = (struct pb_buffer*)fence;
 461
 462     return !rws->buffer_is_busy(rfence);
 463 }
 464
 465 static boolean r300_fence_finish(struct pipe_screen *screen,
 466                                  struct pipe_fence_handle *fence,
 467                                  uint64_t timeout)
 468 {
 469     struct radeon_winsys *rws = r300_screen(screen)->rws;
 470     struct pb_buffer *rfence = (struct pb_buffer*)fence;
 471
 472     if (timeout != PIPE_TIMEOUT_INFINITE) {
 473         int64_t start_time = os_time_get();
 474
 475         /* Convert to microseconds. */
 476         timeout /= 1000;
 477
 478         /* Wait in a loop. */
 479         while (rws->buffer_is_busy(rfence)) {
 480             if (os_time_get() - start_time >= timeout) {
 481                 return FALSE;
 482             }
 483             os_time_sleep(10);
 484         }
 485         return TRUE;
 486     }
 487
 488     rws->buffer_wait(rfence);
 489     return TRUE;
 490 }
 491
 492 struct pipe_screen* r300_screen_create(struct radeon_winsys *rws)
 493 {
 494     struct r300_screen *r300screen = CALLOC_STRUCT(r300_screen);
 495
 496     if (!r300screen) {
 497         FREE(r300screen);
 498         return NULL;
 499     }
 500
 501     rws->query_info(rws, &r300screen->info);
 502
 503     r300_init_debug(r300screen);
 504     r300_parse_chipset(r300screen->info.pci_id, &r300screen->caps);
 505
 506     if (SCREEN_DBG_ON(r300screen, DBG_NO_ZMASK))
 507         r300screen->caps.zmask_ram = 0;
 508     if (SCREEN_DBG_ON(r300screen, DBG_NO_HIZ))
 509         r300screen->caps.hiz_ram = 0;
 510
 511     if (r300screen->info.drm_minor < 8)
 512         r300screen->caps.has_us_format = FALSE;
 513
 514     pipe_mutex_init(r300screen->num_contexts_mutex);
 515
 516     util_slab_create(&r300screen->pool_buffers,
 517                      sizeof(struct r300_resource), 64,
 518                      UTIL_SLAB_SINGLETHREADED);
 519
 520     r300screen->rws = rws;
 521     r300screen->screen.winsys = (struct pipe_winsys*)rws;
 522     r300screen->screen.destroy = r300_destroy_screen;
 523     r300screen->screen.get_name = r300_get_name;
 524     r300screen->screen.get_vendor = r300_get_vendor;
 525     r300screen->screen.get_param = r300_get_param;
 526     r300screen->screen.get_shader_param = r300_get_shader_param;
 527     r300screen->screen.get_paramf = r300_get_paramf;
 528     r300screen->screen.get_video_param = r300_get_video_param;
 529     r300screen->screen.is_format_supported = r300_is_format_supported;
 530     r300screen->screen.is_video_format_supported = vl_video_buffer_is_format_supported;
 531     r300screen->screen.context_create = r300_create_context;
 532     r300screen->screen.fence_reference = r300_fence_reference;
 533     r300screen->screen.fence_signalled = r300_fence_signalled;
 534     r300screen->screen.fence_finish = r300_fence_finish;
 535
 536     r300_init_screen_resource_functions(r300screen);
 537
 538     util_format_s3tc_init();
 539
 540     return &r300screen->screen;
 541 }