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_BLEND_EQUATION_SEPARATE:
 114         case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
 115         case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
 116         case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
 117         case PIPE_CAP_CONDITIONAL_RENDER:
 118         case PIPE_CAP_TEXTURE_BARRIER:
 119             return 1;
 120
 121         /* r300 cannot do swizzling of compressed textures. Supported otherwise. */
 122         case PIPE_CAP_TEXTURE_SWIZZLE:
 123             return util_format_s3tc_enabled ? r300screen->caps.dxtc_swizzle : 1;
 124
 125         /* Supported on r500 only. */
 126         case PIPE_CAP_FRAGMENT_COLOR_CLAMP_CONTROL:
 127         case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
 128         case PIPE_CAP_SM3:
 129             return is_r500 ? 1 : 0;
 130
 131         /* Unsupported features. */
 132         case PIPE_CAP_TIMER_QUERY:
 133         case PIPE_CAP_DUAL_SOURCE_BLEND:
 134         case PIPE_CAP_INDEP_BLEND_ENABLE:
 135         case PIPE_CAP_INDEP_BLEND_FUNC:
 136         case PIPE_CAP_DEPTH_CLAMP:
 137         case PIPE_CAP_DEPTHSTENCIL_CLEAR_SEPARATE:
 138         case PIPE_CAP_SHADER_STENCIL_EXPORT:
 139         case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
 140         case PIPE_CAP_TGSI_INSTANCEID:
 141         case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
 142         case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
 143         case PIPE_CAP_SEAMLESS_CUBE_MAP:
 144         case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
 145         case PIPE_CAP_SCALED_RESOLVE:
 146         case PIPE_CAP_MIN_TEXEL_OFFSET:
 147         case PIPE_CAP_MAX_TEXEL_OFFSET:
 148         case PIPE_CAP_STREAM_OUTPUT:
 149             return 0;
 150
 151         /* SWTCL-only features. */
 152         case PIPE_CAP_PRIMITIVE_RESTART:
 153             return !r300screen->caps.has_tcl;
 154
 155         /* Texturing. */
 156         case PIPE_CAP_MAX_COMBINED_SAMPLERS:
 157             return r300screen->caps.num_tex_units;
 158         case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
 159         case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
 160         case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
 161             /* 13 == 4096, 12 == 2048 */
 162             return is_r500 ? 13 : 12;
 163
 164         /* Render targets. */
 165         case PIPE_CAP_MAX_RENDER_TARGETS:
 166             return 4;
 167
 168         default:
 169             debug_printf("r300: Warning: Unknown CAP %d in get_param.\n",
 170                          param);
 171             return 0;
 172     }
 173 }
 174
 175 static int r300_get_shader_param(struct pipe_screen *pscreen, unsigned shader, enum pipe_shader_cap param)
 176 {
 177    struct r300_screen* r300screen = r300_screen(pscreen);
 178    boolean is_r400 = r300screen->caps.is_r400;
 179    boolean is_r500 = r300screen->caps.is_r500;
 180
 181    switch (shader)
 182     {
 183     case PIPE_SHADER_FRAGMENT:
 184         switch (param)
 185         {
 186         case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
 187             return is_r500 || is_r400 ? 512 : 96;
 188         case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
 189             return is_r500 || is_r400 ? 512 : 64;
 190         case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
 191             return is_r500 || is_r400 ? 512 : 32;
 192         case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
 193             return is_r500 ? 511 : 4;
 194         case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
 195             return is_r500 ? 64 : 0; /* Actually unlimited on r500. */
 196             /* Fragment shader limits. */
 197         case PIPE_SHADER_CAP_MAX_INPUTS:
 198             /* 2 colors + 8 texcoords are always supported
 199              * (minus fog and wpos).
 200              *
 201              * R500 has the ability to turn 3rd and 4th color into
 202              * additional texcoords but there is no two-sided color
 203              * selection then. However the facing bit can be used instead. */
 204             return 10;
 205         case PIPE_SHADER_CAP_MAX_CONSTS:
 206             return is_r500 ? 256 : 32;
 207         case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
 208             return 1;
 209         case PIPE_SHADER_CAP_MAX_TEMPS:
 210             return is_r500 ? 128 : is_r400 ? 64 : 32;
 211         case PIPE_SHADER_CAP_MAX_ADDRS:
 212             return 0;
 213         case PIPE_SHADER_CAP_MAX_PREDS:
 214             return is_r500 ? 1 : 0;
 215         case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
 216         case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
 217         case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
 218         case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
 219         case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
 220         case PIPE_SHADER_CAP_SUBROUTINES:
 221         case PIPE_SHADER_CAP_INTEGERS:
 222             return 0;
 223         case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
 224            return r300screen->caps.num_tex_units;
 225         }
 226         break;
 227     case PIPE_SHADER_VERTEX:
 228         switch (param)
 229         {
 230         case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
 231             return 0;
 232         default:;
 233         }
 234
 235         if (!r300screen->caps.has_tcl) {
 236             return draw_get_shader_param(shader, param);
 237         }
 238
 239         switch (param)
 240         {
 241         case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
 242         case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
 243             return is_r500 ? 1024 : 256;
 244         case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
 245         case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
 246             return 0;
 247         case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
 248             return is_r500 ? 4 : 0; /* For loops; not sure about conditionals. */
 249         case PIPE_SHADER_CAP_MAX_INPUTS:
 250             return 16;
 251         case PIPE_SHADER_CAP_MAX_CONSTS:
 252             return 256;
 253         case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
 254             return 1;
 255         case PIPE_SHADER_CAP_MAX_TEMPS:
 256             return 32;
 257         case PIPE_SHADER_CAP_MAX_ADDRS:
 258             return 1; /* XXX guessed */
 259         case PIPE_SHADER_CAP_MAX_PREDS:
 260             return is_r500 ? 4 : 0; /* XXX guessed. */
 261         case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
 262             return 1;
 263         case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
 264         case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
 265         case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
 266         case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
 267         case PIPE_SHADER_CAP_SUBROUTINES:
 268         case PIPE_SHADER_CAP_INTEGERS:
 269             return 0;
 270         default:;
 271         }
 272         break;
 273     }
 274     return 0;
 275 }
 276
 277 static float r300_get_paramf(struct pipe_screen* pscreen, enum pipe_cap param)
 278 {
 279     struct r300_screen* r300screen = r300_screen(pscreen);
 280
 281     switch (param) {
 282         case PIPE_CAP_MAX_LINE_WIDTH:
 283         case PIPE_CAP_MAX_LINE_WIDTH_AA:
 284         case PIPE_CAP_MAX_POINT_WIDTH:
 285         case PIPE_CAP_MAX_POINT_WIDTH_AA:
 286             /* The maximum dimensions of the colorbuffer are our practical
 287              * rendering limits. 2048 pixels should be enough for anybody. */
 288             if (r300screen->caps.is_r500) {
 289                 return 4096.0f;
 290             } else if (r300screen->caps.is_r400) {
 291                 return 4021.0f;
 292             } else {
 293                 return 2560.0f;
 294             }
 295         case PIPE_CAP_MAX_TEXTURE_ANISOTROPY:
 296             return 16.0f;
 297         case PIPE_CAP_MAX_TEXTURE_LOD_BIAS:
 298             return 16.0f;
 299         case PIPE_CAP_GUARD_BAND_LEFT:
 300         case PIPE_CAP_GUARD_BAND_TOP:
 301         case PIPE_CAP_GUARD_BAND_RIGHT:
 302         case PIPE_CAP_GUARD_BAND_BOTTOM:
 303             /* XXX I don't know what these should be but the least we can do is
 304              * silence the potential error message */
 305             return 0.0f;
 306         default:
 307             debug_printf("r300: Warning: Unknown CAP %d in get_paramf.\n",
 308                          param);
 309             return 0.0f;
 310     }
 311 }
 312
 313 static int r300_get_video_param(struct pipe_screen *screen,
 314                                 enum pipe_video_profile profile,
 315                                 enum pipe_video_cap param)
 316 {
 317    switch (param) {
 318       case PIPE_VIDEO_CAP_SUPPORTED:
 319          return vl_profile_supported(screen, profile);
 320       case PIPE_VIDEO_CAP_NPOT_TEXTURES:
 321          return 0;
 322       case PIPE_VIDEO_CAP_MAX_WIDTH:
 323       case PIPE_VIDEO_CAP_MAX_HEIGHT:
 324          return vl_video_buffer_max_size(screen);
 325       case PIPE_VIDEO_CAP_NUM_BUFFERS_DESIRED:
 326          return vl_num_buffers_desired(screen, profile);
 327       default:
 328          return 0;
 329    }
 330 }
 331
 332 static boolean r300_is_format_supported(struct pipe_screen* screen,
 333                                         enum pipe_format format,
 334                                         enum pipe_texture_target target,
 335                                         unsigned sample_count,
 336                                         unsigned usage)
 337 {
 338     uint32_t retval = 0;
 339     boolean drm_2_8_0 = r300_screen(screen)->info.drm_minor >= 8;
 340     boolean is_r500 = r300_screen(screen)->caps.is_r500;
 341     boolean is_r400 = r300_screen(screen)->caps.is_r400;
 342     boolean is_color2101010 = format == PIPE_FORMAT_R10G10B10A2_UNORM ||
 343                               format == PIPE_FORMAT_R10G10B10X2_SNORM ||
 344                               format == PIPE_FORMAT_B10G10R10A2_UNORM ||
 345                               format == PIPE_FORMAT_R10SG10SB10SA2U_NORM;
 346     boolean is_ati1n = format == PIPE_FORMAT_RGTC1_UNORM ||
 347                        format == PIPE_FORMAT_RGTC1_SNORM ||
 348                        format == PIPE_FORMAT_LATC1_UNORM ||
 349                        format == PIPE_FORMAT_LATC1_SNORM;
 350     boolean is_ati2n = format == PIPE_FORMAT_RGTC2_UNORM ||
 351                        format == PIPE_FORMAT_RGTC2_SNORM ||
 352                        format == PIPE_FORMAT_LATC2_UNORM ||
 353                        format == PIPE_FORMAT_LATC2_SNORM;
 354     boolean is_x16f_xy16f = format == PIPE_FORMAT_R16_FLOAT ||
 355                             format == PIPE_FORMAT_R16G16_FLOAT ||
 356                             format == PIPE_FORMAT_A16_FLOAT ||
 357                             format == PIPE_FORMAT_L16_FLOAT ||
 358                             format == PIPE_FORMAT_L16A16_FLOAT ||
 359                             format == PIPE_FORMAT_I16_FLOAT;
 360     boolean is_half_float = format == PIPE_FORMAT_R16_FLOAT ||
 361                             format == PIPE_FORMAT_R16G16_FLOAT ||
 362                             format == PIPE_FORMAT_R16G16B16_FLOAT ||
 363                             format == PIPE_FORMAT_R16G16B16A16_FLOAT;
 364
 365     if (!util_format_is_supported(format, usage))
 366        return FALSE;
 367
 368     /* Check multisampling support. */
 369     switch (sample_count) {
 370         case 0:
 371         case 1:
 372             break;
 373         case 2:
 374         case 3:
 375         case 4:
 376         case 6:
 377             return FALSE;
 378 #if 0
 379             if (usage != PIPE_BIND_RENDER_TARGET ||
 380                 !util_format_is_rgba8_variant(
 381                     util_format_description(format))) {
 382                 return FALSE;
 383             }
 384 #endif
 385             break;
 386         default:
 387             return FALSE;
 388     }
 389
 390     /* Check sampler format support. */
 391     if ((usage & PIPE_BIND_SAMPLER_VIEW) &&
 392         /* ATI1N is r5xx-only. */
 393         (is_r500 || !is_ati1n) &&
 394         /* ATI2N is supported on r4xx-r5xx. */
 395         (is_r400 || is_r500 || !is_ati2n) &&
 396         /* R16F and RG16F texture support was added in as late as DRM 2.8.0 */
 397         (drm_2_8_0 || !is_x16f_xy16f) &&
 398         r300_is_sampler_format_supported(format)) {
 399         retval |= PIPE_BIND_SAMPLER_VIEW;
 400     }
 401
 402     /* Check colorbuffer format support. */
 403     if ((usage & (PIPE_BIND_RENDER_TARGET |
 404                   PIPE_BIND_DISPLAY_TARGET |
 405                   PIPE_BIND_SCANOUT |
 406                   PIPE_BIND_SHARED)) &&
 407         /* 2101010 cannot be rendered to on non-r5xx. */
 408         (!is_color2101010 || (is_r500 && drm_2_8_0)) &&
 409         r300_is_colorbuffer_format_supported(format)) {
 410         retval |= usage &
 411             (PIPE_BIND_RENDER_TARGET |
 412              PIPE_BIND_DISPLAY_TARGET |
 413              PIPE_BIND_SCANOUT |
 414              PIPE_BIND_SHARED);
 415     }
 416
 417     /* Check depth-stencil format support. */
 418     if (usage & PIPE_BIND_DEPTH_STENCIL &&
 419         r300_is_zs_format_supported(format)) {
 420         retval |= PIPE_BIND_DEPTH_STENCIL;
 421     }
 422
 423     /* Check vertex buffer format support. */
 424     if (usage & PIPE_BIND_VERTEX_BUFFER &&
 425         /* Half float is supported on >= RV350. */
 426         (is_r400 || is_r500 || !is_half_float) &&
 427         r300_translate_vertex_data_type(format) != R300_INVALID_FORMAT) {
 428         retval |= PIPE_BIND_VERTEX_BUFFER;
 429     }
 430
 431     /* Transfers are always supported. */
 432     if (usage & PIPE_BIND_TRANSFER_READ)
 433         retval |= PIPE_BIND_TRANSFER_READ;
 434     if (usage & PIPE_BIND_TRANSFER_WRITE)
 435         retval |= PIPE_BIND_TRANSFER_WRITE;
 436
 437     return retval == usage;
 438 }
 439
 440 static void r300_destroy_screen(struct pipe_screen* pscreen)
 441 {
 442     struct r300_screen* r300screen = r300_screen(pscreen);
 443     struct radeon_winsys *rws = radeon_winsys(pscreen);
 444
 445     util_slab_destroy(&r300screen->pool_buffers);
 446     pipe_mutex_destroy(r300screen->num_contexts_mutex);
 447
 448     if (rws)
 449       rws->destroy(rws);
 450
 451     FREE(r300screen);
 452 }
 453
 454 static void r300_fence_reference(struct pipe_screen *screen,
 455                                  struct pipe_fence_handle **ptr,
 456                                  struct pipe_fence_handle *fence)
 457 {
 458     pb_reference((struct pb_buffer**)ptr,
 459                              (struct pb_buffer*)fence);
 460 }
 461
 462 static boolean r300_fence_signalled(struct pipe_screen *screen,
 463                                     struct pipe_fence_handle *fence)
 464 {
 465     struct radeon_winsys *rws = r300_screen(screen)->rws;
 466     struct pb_buffer *rfence = (struct pb_buffer*)fence;
 467
 468     return !rws->buffer_is_busy(rfence, RADEON_USAGE_READWRITE);
 469 }
 470
 471 static boolean r300_fence_finish(struct pipe_screen *screen,
 472                                  struct pipe_fence_handle *fence,
 473                                  uint64_t timeout)
 474 {
 475     struct radeon_winsys *rws = r300_screen(screen)->rws;
 476     struct pb_buffer *rfence = (struct pb_buffer*)fence;
 477
 478     if (timeout != PIPE_TIMEOUT_INFINITE) {
 479         int64_t start_time = os_time_get();
 480
 481         /* Convert to microseconds. */
 482         timeout /= 1000;
 483
 484         /* Wait in a loop. */
 485         while (rws->buffer_is_busy(rfence, RADEON_USAGE_READWRITE)) {
 486             if (os_time_get() - start_time >= timeout) {
 487                 return FALSE;
 488             }
 489             os_time_sleep(10);
 490         }
 491         return TRUE;
 492     }
 493
 494     rws->buffer_wait(rfence, RADEON_USAGE_READWRITE);
 495     return TRUE;
 496 }
 497
 498 struct pipe_screen* r300_screen_create(struct radeon_winsys *rws)
 499 {
 500     struct r300_screen *r300screen = CALLOC_STRUCT(r300_screen);
 501
 502     if (!r300screen) {
 503         FREE(r300screen);
 504         return NULL;
 505     }
 506
 507     rws->query_info(rws, &r300screen->info);
 508
 509     r300_init_debug(r300screen);
 510     r300_parse_chipset(r300screen->info.pci_id, &r300screen->caps);
 511
 512     if (SCREEN_DBG_ON(r300screen, DBG_NO_ZMASK))
 513         r300screen->caps.zmask_ram = 0;
 514     if (SCREEN_DBG_ON(r300screen, DBG_NO_HIZ))
 515         r300screen->caps.hiz_ram = 0;
 516
 517     if (r300screen->info.drm_minor < 8)
 518         r300screen->caps.has_us_format = FALSE;
 519
 520     pipe_mutex_init(r300screen->num_contexts_mutex);
 521
 522     util_slab_create(&r300screen->pool_buffers,
 523                      sizeof(struct r300_resource), 64,
 524                      UTIL_SLAB_SINGLETHREADED);
 525
 526     r300screen->rws = rws;
 527     r300screen->screen.winsys = (struct pipe_winsys*)rws;
 528     r300screen->screen.destroy = r300_destroy_screen;
 529     r300screen->screen.get_name = r300_get_name;
 530     r300screen->screen.get_vendor = r300_get_vendor;
 531     r300screen->screen.get_param = r300_get_param;
 532     r300screen->screen.get_shader_param = r300_get_shader_param;
 533     r300screen->screen.get_paramf = r300_get_paramf;
 534     r300screen->screen.get_video_param = r300_get_video_param;
 535     r300screen->screen.is_format_supported = r300_is_format_supported;
 536     r300screen->screen.is_video_format_supported = vl_video_buffer_is_format_supported;
 537     r300screen->screen.context_create = r300_create_context;
 538     r300screen->screen.fence_reference = r300_fence_reference;
 539     r300screen->screen.fence_signalled = r300_fence_signalled;
 540     r300screen->screen.fence_finish = r300_fence_finish;
 541
 542     r300_init_screen_resource_functions(r300screen);
 543
 544     util_format_s3tc_init();
 545
 546     return &r300screen->screen;
 547 }