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             return 0;
 149
 150         /* SWTCL-only features. */
 151         case PIPE_CAP_STREAM_OUTPUT:
 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         if (!r300screen->caps.has_tcl) {
 229             return draw_get_shader_param(shader, param);
 230         }
 231
 232         switch (param)
 233         {
 234         case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
 235         case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
 236             return is_r500 ? 1024 : 256;
 237         case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
 238         case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
 239             return 0;
 240         case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
 241             return is_r500 ? 4 : 0; /* For loops; not sure about conditionals. */
 242         case PIPE_SHADER_CAP_MAX_INPUTS:
 243             return 16;
 244         case PIPE_SHADER_CAP_MAX_CONSTS:
 245             return 256;
 246         case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
 247             return 1;
 248         case PIPE_SHADER_CAP_MAX_TEMPS:
 249             return 32;
 250         case PIPE_SHADER_CAP_MAX_ADDRS:
 251             return 1; /* XXX guessed */
 252         case PIPE_SHADER_CAP_MAX_PREDS:
 253             return is_r500 ? 4 : 0; /* XXX guessed. */
 254         case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
 255             return 1;
 256         case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
 257         case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
 258         case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
 259         case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
 260         case PIPE_SHADER_CAP_SUBROUTINES:
 261         case PIPE_SHADER_CAP_INTEGERS:
 262         case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
 263             return 0;
 264         }
 265         break;
 266     default:
 267         break;
 268     }
 269     return 0;
 270 }
 271
 272 static float r300_get_paramf(struct pipe_screen* pscreen, enum pipe_cap param)
 273 {
 274     struct r300_screen* r300screen = r300_screen(pscreen);
 275
 276     switch (param) {
 277         case PIPE_CAP_MAX_LINE_WIDTH:
 278         case PIPE_CAP_MAX_LINE_WIDTH_AA:
 279         case PIPE_CAP_MAX_POINT_WIDTH:
 280         case PIPE_CAP_MAX_POINT_WIDTH_AA:
 281             /* The maximum dimensions of the colorbuffer are our practical
 282              * rendering limits. 2048 pixels should be enough for anybody. */
 283             if (r300screen->caps.is_r500) {
 284                 return 4096.0f;
 285             } else if (r300screen->caps.is_r400) {
 286                 return 4021.0f;
 287             } else {
 288                 return 2560.0f;
 289             }
 290         case PIPE_CAP_MAX_TEXTURE_ANISOTROPY:
 291             return 16.0f;
 292         case PIPE_CAP_MAX_TEXTURE_LOD_BIAS:
 293             return 16.0f;
 294         case PIPE_CAP_GUARD_BAND_LEFT:
 295         case PIPE_CAP_GUARD_BAND_TOP:
 296         case PIPE_CAP_GUARD_BAND_RIGHT:
 297         case PIPE_CAP_GUARD_BAND_BOTTOM:
 298             /* XXX I don't know what these should be but the least we can do is
 299              * silence the potential error message */
 300             return 0.0f;
 301         default:
 302             debug_printf("r300: Warning: Unknown CAP %d in get_paramf.\n",
 303                          param);
 304             return 0.0f;
 305     }
 306 }
 307
 308 static int r300_get_video_param(struct pipe_screen *screen,
 309                                 enum pipe_video_profile profile,
 310                                 enum pipe_video_cap param)
 311 {
 312    switch (param) {
 313       case PIPE_VIDEO_CAP_SUPPORTED:
 314          return vl_profile_supported(screen, profile);
 315       case PIPE_VIDEO_CAP_NPOT_TEXTURES:
 316          return 0;
 317       case PIPE_VIDEO_CAP_MAX_WIDTH:
 318       case PIPE_VIDEO_CAP_MAX_HEIGHT:
 319          return vl_video_buffer_max_size(screen);
 320       case PIPE_VIDEO_CAP_NUM_BUFFERS_DESIRED:
 321          return vl_num_buffers_desired(screen, profile);
 322       default:
 323          return 0;
 324    }
 325 }
 326
 327 static boolean r300_is_format_supported(struct pipe_screen* screen,
 328                                         enum pipe_format format,
 329                                         enum pipe_texture_target target,
 330                                         unsigned sample_count,
 331                                         unsigned usage)
 332 {
 333     uint32_t retval = 0;
 334     boolean drm_2_8_0 = r300_screen(screen)->info.drm_minor >= 8;
 335     boolean is_r500 = r300_screen(screen)->caps.is_r500;
 336     boolean is_r400 = r300_screen(screen)->caps.is_r400;
 337     boolean is_color2101010 = format == PIPE_FORMAT_R10G10B10A2_UNORM ||
 338                               format == PIPE_FORMAT_R10G10B10X2_SNORM ||
 339                               format == PIPE_FORMAT_B10G10R10A2_UNORM ||
 340                               format == PIPE_FORMAT_R10SG10SB10SA2U_NORM;
 341     boolean is_ati1n = format == PIPE_FORMAT_RGTC1_UNORM ||
 342                        format == PIPE_FORMAT_RGTC1_SNORM ||
 343                        format == PIPE_FORMAT_LATC1_UNORM ||
 344                        format == PIPE_FORMAT_LATC1_SNORM;
 345     boolean is_ati2n = format == PIPE_FORMAT_RGTC2_UNORM ||
 346                        format == PIPE_FORMAT_RGTC2_SNORM ||
 347                        format == PIPE_FORMAT_LATC2_UNORM ||
 348                        format == PIPE_FORMAT_LATC2_SNORM;
 349     boolean is_x16f_xy16f = format == PIPE_FORMAT_R16_FLOAT ||
 350                             format == PIPE_FORMAT_R16G16_FLOAT ||
 351                             format == PIPE_FORMAT_A16_FLOAT ||
 352                             format == PIPE_FORMAT_L16_FLOAT ||
 353                             format == PIPE_FORMAT_L16A16_FLOAT ||
 354                             format == PIPE_FORMAT_I16_FLOAT;
 355     boolean is_half_float = format == PIPE_FORMAT_R16_FLOAT ||
 356                             format == PIPE_FORMAT_R16G16_FLOAT ||
 357                             format == PIPE_FORMAT_R16G16B16_FLOAT ||
 358                             format == PIPE_FORMAT_R16G16B16A16_FLOAT;
 359
 360     if (!util_format_is_supported(format, usage))
 361        return FALSE;
 362
 363     /* Check multisampling support. */
 364     switch (sample_count) {
 365         case 0:
 366         case 1:
 367             break;
 368         case 2:
 369         case 3:
 370         case 4:
 371         case 6:
 372             return FALSE;
 373 #if 0
 374             if (usage != PIPE_BIND_RENDER_TARGET ||
 375                 !util_format_is_rgba8_variant(
 376                     util_format_description(format))) {
 377                 return FALSE;
 378             }
 379 #endif
 380             break;
 381         default:
 382             return FALSE;
 383     }
 384
 385     /* Check sampler format support. */
 386     if ((usage & PIPE_BIND_SAMPLER_VIEW) &&
 387         /* ATI1N is r5xx-only. */
 388         (is_r500 || !is_ati1n) &&
 389         /* ATI2N is supported on r4xx-r5xx. */
 390         (is_r400 || is_r500 || !is_ati2n) &&
 391         /* R16F and RG16F texture support was added in as late as DRM 2.8.0 */
 392         (drm_2_8_0 || !is_x16f_xy16f) &&
 393         r300_is_sampler_format_supported(format)) {
 394         retval |= PIPE_BIND_SAMPLER_VIEW;
 395     }
 396
 397     /* Check colorbuffer format support. */
 398     if ((usage & (PIPE_BIND_RENDER_TARGET |
 399                   PIPE_BIND_DISPLAY_TARGET |
 400                   PIPE_BIND_SCANOUT |
 401                   PIPE_BIND_SHARED)) &&
 402         /* 2101010 cannot be rendered to on non-r5xx. */
 403         (!is_color2101010 || (is_r500 && drm_2_8_0)) &&
 404         r300_is_colorbuffer_format_supported(format)) {
 405         retval |= usage &
 406             (PIPE_BIND_RENDER_TARGET |
 407              PIPE_BIND_DISPLAY_TARGET |
 408              PIPE_BIND_SCANOUT |
 409              PIPE_BIND_SHARED);
 410     }
 411
 412     /* Check depth-stencil format support. */
 413     if (usage & PIPE_BIND_DEPTH_STENCIL &&
 414         r300_is_zs_format_supported(format)) {
 415         retval |= PIPE_BIND_DEPTH_STENCIL;
 416     }
 417
 418     /* Check vertex buffer format support. */
 419     if (usage & PIPE_BIND_VERTEX_BUFFER &&
 420         /* Half float is supported on >= RV350. */
 421         (is_r400 || is_r500 || !is_half_float) &&
 422         r300_translate_vertex_data_type(format) != R300_INVALID_FORMAT) {
 423         retval |= PIPE_BIND_VERTEX_BUFFER;
 424     }
 425
 426     /* Transfers are always supported. */
 427     if (usage & PIPE_BIND_TRANSFER_READ)
 428         retval |= PIPE_BIND_TRANSFER_READ;
 429     if (usage & PIPE_BIND_TRANSFER_WRITE)
 430         retval |= PIPE_BIND_TRANSFER_WRITE;
 431
 432     return retval == usage;
 433 }
 434
 435 static void r300_destroy_screen(struct pipe_screen* pscreen)
 436 {
 437     struct r300_screen* r300screen = r300_screen(pscreen);
 438     struct radeon_winsys *rws = radeon_winsys(pscreen);
 439
 440     util_slab_destroy(&r300screen->pool_buffers);
 441     pipe_mutex_destroy(r300screen->num_contexts_mutex);
 442
 443     if (rws)
 444       rws->destroy(rws);
 445
 446     FREE(r300screen);
 447 }
 448
 449 static void r300_fence_reference(struct pipe_screen *screen,
 450                                  struct pipe_fence_handle **ptr,
 451                                  struct pipe_fence_handle *fence)
 452 {
 453     pb_reference((struct pb_buffer**)ptr,
 454                              (struct pb_buffer*)fence);
 455 }
 456
 457 static boolean r300_fence_signalled(struct pipe_screen *screen,
 458                                     struct pipe_fence_handle *fence)
 459 {
 460     struct radeon_winsys *rws = r300_screen(screen)->rws;
 461     struct pb_buffer *rfence = (struct pb_buffer*)fence;
 462
 463     return !rws->buffer_is_busy(rfence, RADEON_USAGE_READWRITE);
 464 }
 465
 466 static boolean r300_fence_finish(struct pipe_screen *screen,
 467                                  struct pipe_fence_handle *fence,
 468                                  uint64_t timeout)
 469 {
 470     struct radeon_winsys *rws = r300_screen(screen)->rws;
 471     struct pb_buffer *rfence = (struct pb_buffer*)fence;
 472
 473     if (timeout != PIPE_TIMEOUT_INFINITE) {
 474         int64_t start_time = os_time_get();
 475
 476         /* Convert to microseconds. */
 477         timeout /= 1000;
 478
 479         /* Wait in a loop. */
 480         while (rws->buffer_is_busy(rfence, RADEON_USAGE_READWRITE)) {
 481             if (os_time_get() - start_time >= timeout) {
 482                 return FALSE;
 483             }
 484             os_time_sleep(10);
 485         }
 486         return TRUE;
 487     }
 488
 489     rws->buffer_wait(rfence, RADEON_USAGE_READWRITE);
 490     return TRUE;
 491 }
 492
 493 struct pipe_screen* r300_screen_create(struct radeon_winsys *rws)
 494 {
 495     struct r300_screen *r300screen = CALLOC_STRUCT(r300_screen);
 496
 497     if (!r300screen) {
 498         FREE(r300screen);
 499         return NULL;
 500     }
 501
 502     rws->query_info(rws, &r300screen->info);
 503
 504     r300_init_debug(r300screen);
 505     r300_parse_chipset(r300screen->info.pci_id, &r300screen->caps);
 506
 507     if (SCREEN_DBG_ON(r300screen, DBG_NO_ZMASK))
 508         r300screen->caps.zmask_ram = 0;
 509     if (SCREEN_DBG_ON(r300screen, DBG_NO_HIZ))
 510         r300screen->caps.hiz_ram = 0;
 511
 512     if (r300screen->info.drm_minor < 8)
 513         r300screen->caps.has_us_format = FALSE;
 514
 515     pipe_mutex_init(r300screen->num_contexts_mutex);
 516
 517     util_slab_create(&r300screen->pool_buffers,
 518                      sizeof(struct r300_resource), 64,
 519                      UTIL_SLAB_SINGLETHREADED);
 520
 521     r300screen->rws = rws;
 522     r300screen->screen.winsys = (struct pipe_winsys*)rws;
 523     r300screen->screen.destroy = r300_destroy_screen;
 524     r300screen->screen.get_name = r300_get_name;
 525     r300screen->screen.get_vendor = r300_get_vendor;
 526     r300screen->screen.get_param = r300_get_param;
 527     r300screen->screen.get_shader_param = r300_get_shader_param;
 528     r300screen->screen.get_paramf = r300_get_paramf;
 529     r300screen->screen.get_video_param = r300_get_video_param;
 530     r300screen->screen.is_format_supported = r300_is_format_supported;
 531     r300screen->screen.is_video_format_supported = vl_video_buffer_is_format_supported;
 532     r300screen->screen.context_create = r300_create_context;
 533     r300screen->screen.fence_reference = r300_fence_reference;
 534     r300screen->screen.fence_signalled = r300_fence_signalled;
 535     r300screen->screen.fence_finish = r300_fence_finish;
 536
 537     r300_init_screen_resource_functions(r300screen);
 538
 539     util_format_s3tc_init();
 540
 541     return &r300screen->screen;
 542 }