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_ANISOTROPIC_FILTER:
  93         case PIPE_CAP_POINT_SPRITE:
  94         case PIPE_CAP_OCCLUSION_QUERY:
  95         case PIPE_CAP_TEXTURE_SHADOW_MAP:
  96         case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
  97         case PIPE_CAP_BLEND_EQUATION_SEPARATE:
  98         case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
  99         case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
 100         case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
 101         case PIPE_CAP_CONDITIONAL_RENDER:
 102         case PIPE_CAP_TEXTURE_BARRIER:
 103         case PIPE_CAP_TGSI_CAN_COMPACT_VARYINGS:
 104         case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
 105             return 1;
 106
 107         /* r300 cannot do swizzling of compressed textures. Supported otherwise. */
 108         case PIPE_CAP_TEXTURE_SWIZZLE:
 109             return util_format_s3tc_enabled ? r300screen->caps.dxtc_swizzle : 1;
 110
 111         /* Supported on r500 only. */
 112         case PIPE_CAP_FRAGMENT_COLOR_CLAMP_CONTROL:
 113         case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
 114         case PIPE_CAP_SM3:
 115             return is_r500 ? 1 : 0;
 116
 117         /* Unsupported features. */
 118         case PIPE_CAP_TIMER_QUERY:
 119         case PIPE_CAP_DUAL_SOURCE_BLEND:
 120         case PIPE_CAP_INDEP_BLEND_ENABLE:
 121         case PIPE_CAP_INDEP_BLEND_FUNC:
 122         case PIPE_CAP_DEPTH_CLAMP:
 123         case PIPE_CAP_DEPTHSTENCIL_CLEAR_SEPARATE:
 124         case PIPE_CAP_SHADER_STENCIL_EXPORT:
 125         case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
 126         case PIPE_CAP_TGSI_INSTANCEID:
 127         case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
 128         case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
 129         case PIPE_CAP_SEAMLESS_CUBE_MAP:
 130         case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
 131         case PIPE_CAP_SCALED_RESOLVE:
 132         case PIPE_CAP_MIN_TEXEL_OFFSET:
 133         case PIPE_CAP_MAX_TEXEL_OFFSET:
 134         case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS:
 135             return 0;
 136
 137         /* SWTCL-only features. */
 138         case PIPE_CAP_PRIMITIVE_RESTART:
 139             return !r300screen->caps.has_tcl;
 140
 141         /* Texturing. */
 142         case PIPE_CAP_MAX_COMBINED_SAMPLERS:
 143             return r300screen->caps.num_tex_units;
 144         case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
 145         case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
 146         case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
 147             /* 13 == 4096, 12 == 2048 */
 148             return is_r500 ? 13 : 12;
 149
 150         /* Render targets. */
 151         case PIPE_CAP_MAX_RENDER_TARGETS:
 152             return 4;
 153     }
 154     return 0;
 155 }
 156
 157 static int r300_get_shader_param(struct pipe_screen *pscreen, unsigned shader, enum pipe_shader_cap param)
 158 {
 159    struct r300_screen* r300screen = r300_screen(pscreen);
 160    boolean is_r400 = r300screen->caps.is_r400;
 161    boolean is_r500 = r300screen->caps.is_r500;
 162
 163    switch (shader) {
 164     case PIPE_SHADER_FRAGMENT:
 165         switch (param)
 166         {
 167         case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
 168             return is_r500 || is_r400 ? 512 : 96;
 169         case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
 170             return is_r500 || is_r400 ? 512 : 64;
 171         case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
 172             return is_r500 || is_r400 ? 512 : 32;
 173         case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
 174             return is_r500 ? 511 : 4;
 175         case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
 176             return is_r500 ? 64 : 0; /* Actually unlimited on r500. */
 177             /* Fragment shader limits. */
 178         case PIPE_SHADER_CAP_MAX_INPUTS:
 179             /* 2 colors + 8 texcoords are always supported
 180              * (minus fog and wpos).
 181              *
 182              * R500 has the ability to turn 3rd and 4th color into
 183              * additional texcoords but there is no two-sided color
 184              * selection then. However the facing bit can be used instead. */
 185             return 10;
 186         case PIPE_SHADER_CAP_MAX_CONSTS:
 187             return is_r500 ? 256 : 32;
 188         case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
 189             return 1;
 190         case PIPE_SHADER_CAP_MAX_TEMPS:
 191             return is_r500 ? 128 : is_r400 ? 64 : 32;
 192         case PIPE_SHADER_CAP_MAX_PREDS:
 193             return is_r500 ? 1 : 0;
 194         case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
 195            return r300screen->caps.num_tex_units;
 196         case PIPE_SHADER_CAP_MAX_ADDRS:
 197         case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
 198         case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
 199         case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
 200         case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
 201         case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
 202         case PIPE_SHADER_CAP_SUBROUTINES:
 203         case PIPE_SHADER_CAP_INTEGERS:
 204         case PIPE_SHADER_CAP_OUTPUT_READ:
 205             return 0;
 206         }
 207         break;
 208     case PIPE_SHADER_VERTEX:
 209         switch (param)
 210         {
 211         case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
 212             return 0;
 213         default:;
 214         }
 215
 216         if (!r300screen->caps.has_tcl) {
 217             return draw_get_shader_param(shader, param);
 218         }
 219
 220         switch (param)
 221         {
 222         case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
 223         case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
 224             return is_r500 ? 1024 : 256;
 225         case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
 226             return is_r500 ? 4 : 0; /* For loops; not sure about conditionals. */
 227         case PIPE_SHADER_CAP_MAX_INPUTS:
 228             return 16;
 229         case PIPE_SHADER_CAP_MAX_CONSTS:
 230             return 256;
 231         case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
 232             return 1;
 233         case PIPE_SHADER_CAP_MAX_TEMPS:
 234             return 32;
 235         case PIPE_SHADER_CAP_MAX_ADDRS:
 236             return 1; /* XXX guessed */
 237         case PIPE_SHADER_CAP_MAX_PREDS:
 238             return is_r500 ? 4 : 0; /* XXX guessed. */
 239         case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
 240             return 1;
 241         case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
 242         case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
 243         case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
 244         case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
 245         case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
 246         case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
 247         case PIPE_SHADER_CAP_SUBROUTINES:
 248         case PIPE_SHADER_CAP_INTEGERS:
 249         case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
 250         case PIPE_SHADER_CAP_OUTPUT_READ:
 251             return 0;
 252         }
 253         break;
 254     }
 255     return 0;
 256 }
 257
 258 static float r300_get_paramf(struct pipe_screen* pscreen,
 259                              enum pipe_capf param)
 260 {
 261     struct r300_screen* r300screen = r300_screen(pscreen);
 262
 263     switch (param) {
 264         case PIPE_CAPF_MAX_LINE_WIDTH:
 265         case PIPE_CAPF_MAX_LINE_WIDTH_AA:
 266         case PIPE_CAPF_MAX_POINT_WIDTH:
 267         case PIPE_CAPF_MAX_POINT_WIDTH_AA:
 268             /* The maximum dimensions of the colorbuffer are our practical
 269              * rendering limits. 2048 pixels should be enough for anybody. */
 270             if (r300screen->caps.is_r500) {
 271                 return 4096.0f;
 272             } else if (r300screen->caps.is_r400) {
 273                 return 4021.0f;
 274             } else {
 275                 return 2560.0f;
 276             }
 277         case PIPE_CAPF_MAX_TEXTURE_ANISOTROPY:
 278             return 16.0f;
 279         case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
 280             return 16.0f;
 281         case PIPE_CAPF_GUARD_BAND_LEFT:
 282         case PIPE_CAPF_GUARD_BAND_TOP:
 283         case PIPE_CAPF_GUARD_BAND_RIGHT:
 284         case PIPE_CAPF_GUARD_BAND_BOTTOM:
 285             /* XXX I don't know what these should be but the least we can do is
 286              * silence the potential error message */
 287             return 0.0f;
 288         default:
 289             debug_printf("r300: Warning: Unknown CAP %d in get_paramf.\n",
 290                          param);
 291             return 0.0f;
 292     }
 293 }
 294
 295 static int r300_get_video_param(struct pipe_screen *screen,
 296                                 enum pipe_video_profile profile,
 297                                 enum pipe_video_cap param)
 298 {
 299    switch (param) {
 300       case PIPE_VIDEO_CAP_SUPPORTED:
 301          return vl_profile_supported(screen, profile);
 302       case PIPE_VIDEO_CAP_NPOT_TEXTURES:
 303          return 0;
 304       case PIPE_VIDEO_CAP_MAX_WIDTH:
 305       case PIPE_VIDEO_CAP_MAX_HEIGHT:
 306          return vl_video_buffer_max_size(screen);
 307       case PIPE_VIDEO_CAP_NUM_BUFFERS_DESIRED:
 308          return vl_num_buffers_desired(screen, profile);
 309       default:
 310          return 0;
 311    }
 312 }
 313
 314 static boolean r300_is_format_supported(struct pipe_screen* screen,
 315                                         enum pipe_format format,
 316                                         enum pipe_texture_target target,
 317                                         unsigned sample_count,
 318                                         unsigned usage)
 319 {
 320     uint32_t retval = 0;
 321     boolean drm_2_8_0 = r300_screen(screen)->info.drm_minor >= 8;
 322     boolean is_r500 = r300_screen(screen)->caps.is_r500;
 323     boolean is_r400 = r300_screen(screen)->caps.is_r400;
 324     boolean is_color2101010 = format == PIPE_FORMAT_R10G10B10A2_UNORM ||
 325                               format == PIPE_FORMAT_R10G10B10X2_SNORM ||
 326                               format == PIPE_FORMAT_B10G10R10A2_UNORM ||
 327                               format == PIPE_FORMAT_R10SG10SB10SA2U_NORM;
 328     boolean is_ati1n = format == PIPE_FORMAT_RGTC1_UNORM ||
 329                        format == PIPE_FORMAT_RGTC1_SNORM ||
 330                        format == PIPE_FORMAT_LATC1_UNORM ||
 331                        format == PIPE_FORMAT_LATC1_SNORM;
 332     boolean is_ati2n = format == PIPE_FORMAT_RGTC2_UNORM ||
 333                        format == PIPE_FORMAT_RGTC2_SNORM ||
 334                        format == PIPE_FORMAT_LATC2_UNORM ||
 335                        format == PIPE_FORMAT_LATC2_SNORM;
 336     boolean is_x16f_xy16f = format == PIPE_FORMAT_R16_FLOAT ||
 337                             format == PIPE_FORMAT_R16G16_FLOAT ||
 338                             format == PIPE_FORMAT_A16_FLOAT ||
 339                             format == PIPE_FORMAT_L16_FLOAT ||
 340                             format == PIPE_FORMAT_L16A16_FLOAT ||
 341                             format == PIPE_FORMAT_I16_FLOAT;
 342     boolean is_half_float = format == PIPE_FORMAT_R16_FLOAT ||
 343                             format == PIPE_FORMAT_R16G16_FLOAT ||
 344                             format == PIPE_FORMAT_R16G16B16_FLOAT ||
 345                             format == PIPE_FORMAT_R16G16B16A16_FLOAT;
 346     boolean is_fixed = format == PIPE_FORMAT_R32_FIXED ||
 347                        format == PIPE_FORMAT_R32G32_FIXED ||
 348                        format == PIPE_FORMAT_R32G32B32_FIXED ||
 349                        format == PIPE_FORMAT_R32G32B32A32_FIXED;
 350
 351     if (!util_format_is_supported(format, usage))
 352        return FALSE;
 353
 354     /* Check multisampling support. */
 355     switch (sample_count) {
 356         case 0:
 357         case 1:
 358             break;
 359         case 2:
 360         case 3:
 361         case 4:
 362         case 6:
 363             return FALSE;
 364 #if 0
 365             if (usage != PIPE_BIND_RENDER_TARGET ||
 366                 !util_format_is_rgba8_variant(
 367                     util_format_description(format))) {
 368                 return FALSE;
 369             }
 370 #endif
 371             break;
 372         default:
 373             return FALSE;
 374     }
 375
 376     /* Check sampler format support. */
 377     if ((usage & PIPE_BIND_SAMPLER_VIEW) &&
 378         /* ATI1N is r5xx-only. */
 379         (is_r500 || !is_ati1n) &&
 380         /* ATI2N is supported on r4xx-r5xx. */
 381         (is_r400 || is_r500 || !is_ati2n) &&
 382         /* R16F and RG16F texture support was added in as late as DRM 2.8.0 */
 383         (drm_2_8_0 || !is_x16f_xy16f) &&
 384         r300_is_sampler_format_supported(format)) {
 385         retval |= PIPE_BIND_SAMPLER_VIEW;
 386     }
 387
 388     /* Check colorbuffer format support. */
 389     if ((usage & (PIPE_BIND_RENDER_TARGET |
 390                   PIPE_BIND_DISPLAY_TARGET |
 391                   PIPE_BIND_SCANOUT |
 392                   PIPE_BIND_SHARED)) &&
 393         /* 2101010 cannot be rendered to on non-r5xx. */
 394         (!is_color2101010 || (is_r500 && drm_2_8_0)) &&
 395         r300_is_colorbuffer_format_supported(format)) {
 396         retval |= usage &
 397             (PIPE_BIND_RENDER_TARGET |
 398              PIPE_BIND_DISPLAY_TARGET |
 399              PIPE_BIND_SCANOUT |
 400              PIPE_BIND_SHARED);
 401     }
 402
 403     /* Check depth-stencil format support. */
 404     if (usage & PIPE_BIND_DEPTH_STENCIL &&
 405         r300_is_zs_format_supported(format)) {
 406         retval |= PIPE_BIND_DEPTH_STENCIL;
 407     }
 408
 409     /* Check vertex buffer format support. */
 410     if (usage & PIPE_BIND_VERTEX_BUFFER &&
 411         /* Half float is supported on >= R400. */
 412         (is_r400 || is_r500 || !is_half_float) &&
 413         /* We have a fallback for FIXED. */
 414         (is_fixed || r300_translate_vertex_data_type(format) != R300_INVALID_FORMAT)) {
 415         retval |= PIPE_BIND_VERTEX_BUFFER;
 416     }
 417
 418     /* Transfers are always supported. */
 419     if (usage & PIPE_BIND_TRANSFER_READ)
 420         retval |= PIPE_BIND_TRANSFER_READ;
 421     if (usage & PIPE_BIND_TRANSFER_WRITE)
 422         retval |= PIPE_BIND_TRANSFER_WRITE;
 423
 424     return retval == usage;
 425 }
 426
 427 static void r300_destroy_screen(struct pipe_screen* pscreen)
 428 {
 429     struct r300_screen* r300screen = r300_screen(pscreen);
 430     struct radeon_winsys *rws = radeon_winsys(pscreen);
 431
 432     util_slab_destroy(&r300screen->pool_buffers);
 433     pipe_mutex_destroy(r300screen->num_contexts_mutex);
 434
 435     if (rws)
 436       rws->destroy(rws);
 437
 438     FREE(r300screen);
 439 }
 440
 441 static void r300_fence_reference(struct pipe_screen *screen,
 442                                  struct pipe_fence_handle **ptr,
 443                                  struct pipe_fence_handle *fence)
 444 {
 445     pb_reference((struct pb_buffer**)ptr,
 446                              (struct pb_buffer*)fence);
 447 }
 448
 449 static boolean r300_fence_signalled(struct pipe_screen *screen,
 450                                     struct pipe_fence_handle *fence)
 451 {
 452     struct radeon_winsys *rws = r300_screen(screen)->rws;
 453     struct pb_buffer *rfence = (struct pb_buffer*)fence;
 454
 455     return !rws->buffer_is_busy(rfence, RADEON_USAGE_READWRITE);
 456 }
 457
 458 static boolean r300_fence_finish(struct pipe_screen *screen,
 459                                  struct pipe_fence_handle *fence,
 460                                  uint64_t timeout)
 461 {
 462     struct radeon_winsys *rws = r300_screen(screen)->rws;
 463     struct pb_buffer *rfence = (struct pb_buffer*)fence;
 464
 465     if (timeout != PIPE_TIMEOUT_INFINITE) {
 466         int64_t start_time = os_time_get();
 467
 468         /* Convert to microseconds. */
 469         timeout /= 1000;
 470
 471         /* Wait in a loop. */
 472         while (rws->buffer_is_busy(rfence, RADEON_USAGE_READWRITE)) {
 473             if (os_time_get() - start_time >= timeout) {
 474                 return FALSE;
 475             }
 476             os_time_sleep(10);
 477         }
 478         return TRUE;
 479     }
 480
 481     rws->buffer_wait(rfence, RADEON_USAGE_READWRITE);
 482     return TRUE;
 483 }
 484
 485 struct pipe_screen* r300_screen_create(struct radeon_winsys *rws)
 486 {
 487     struct r300_screen *r300screen = CALLOC_STRUCT(r300_screen);
 488
 489     if (!r300screen) {
 490         FREE(r300screen);
 491         return NULL;
 492     }
 493
 494     rws->query_info(rws, &r300screen->info);
 495
 496     r300_init_debug(r300screen);
 497     r300_parse_chipset(r300screen->info.pci_id, &r300screen->caps);
 498
 499     if (SCREEN_DBG_ON(r300screen, DBG_NO_ZMASK))
 500         r300screen->caps.zmask_ram = 0;
 501     if (SCREEN_DBG_ON(r300screen, DBG_NO_HIZ))
 502         r300screen->caps.hiz_ram = 0;
 503
 504     if (r300screen->info.drm_minor < 8)
 505         r300screen->caps.has_us_format = FALSE;
 506
 507     pipe_mutex_init(r300screen->num_contexts_mutex);
 508
 509     util_slab_create(&r300screen->pool_buffers,
 510                      sizeof(struct r300_resource), 64,
 511                      UTIL_SLAB_SINGLETHREADED);
 512
 513     r300screen->rws = rws;
 514     r300screen->screen.winsys = (struct pipe_winsys*)rws;
 515     r300screen->screen.destroy = r300_destroy_screen;
 516     r300screen->screen.get_name = r300_get_name;
 517     r300screen->screen.get_vendor = r300_get_vendor;
 518     r300screen->screen.get_param = r300_get_param;
 519     r300screen->screen.get_shader_param = r300_get_shader_param;
 520     r300screen->screen.get_paramf = r300_get_paramf;
 521     r300screen->screen.get_video_param = r300_get_video_param;
 522     r300screen->screen.is_format_supported = r300_is_format_supported;
 523     r300screen->screen.is_video_format_supported = vl_video_buffer_is_format_supported;
 524     r300screen->screen.context_create = r300_create_context;
 525     r300screen->screen.fence_reference = r300_fence_reference;
 526     r300screen->screen.fence_signalled = r300_fence_signalled;
 527     r300screen->screen.fence_finish = r300_fence_finish;
 528
 529     r300_init_screen_resource_functions(r300screen);
 530
 531     util_format_s3tc_init();
 532
 533     return &r300screen->screen;
 534 }