src/gallium/drivers/r300/r300_context.c

   1 /*
   2  * Copyright 2008 Corbin Simpson <MostAwesomeDude@gmail.com>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE. */
  22
  23 #include "draw/draw_context.h"
  24
  25 #include "util/u_memory.h"
  26 #include "util/u_sampler.h"
  27 #include "util/u_simple_list.h"
  28 #include "util/u_upload_mgr.h"
  29
  30 #include "r300_cb.h"
  31 #include "r300_context.h"
  32 #include "r300_emit.h"
  33 #include "r300_hyperz.h"
  34 #include "r300_screen.h"
  35 #include "r300_screen_buffer.h"
  36 #include "r300_winsys.h"
  37
  38 #include <inttypes.h>
  39
  40 static void r300_update_num_contexts(struct r300_screen *r300screen,
  41                                      int diff)
  42 {
  43     if (diff > 0) {
  44         p_atomic_inc(&r300screen->num_contexts);
  45
  46         if (r300screen->num_contexts > 1)
  47             util_mempool_set_thread_safety(&r300screen->pool_buffers,
  48                                            UTIL_MEMPOOL_MULTITHREADED);
  49     } else {
  50         p_atomic_dec(&r300screen->num_contexts);
  51
  52         if (r300screen->num_contexts <= 1)
  53             util_mempool_set_thread_safety(&r300screen->pool_buffers,
  54                                            UTIL_MEMPOOL_SINGLETHREADED);
  55     }
  56 }
  57
  58 static void r300_release_referenced_objects(struct r300_context *r300)
  59 {
  60     struct pipe_framebuffer_state *fb =
  61             (struct pipe_framebuffer_state*)r300->fb_state.state;
  62     struct r300_textures_state *textures =
  63             (struct r300_textures_state*)r300->textures_state.state;
  64     struct r300_query *query, *temp;
  65     unsigned i;
  66
  67     /* Framebuffer state. */
  68     util_unreference_framebuffer_state(fb);
  69
  70     /* Textures. */
  71     for (i = 0; i < textures->sampler_view_count; i++)
  72         pipe_sampler_view_reference(
  73                 (struct pipe_sampler_view**)&textures->sampler_views[i], NULL);
  74
  75     /* The special dummy texture for texkill. */
  76     if (r300->texkill_sampler) {
  77         pipe_sampler_view_reference(
  78                 (struct pipe_sampler_view**)&r300->texkill_sampler,
  79                 NULL);
  80     }
  81
  82     /* The SWTCL VBO. */
  83     pipe_resource_reference(&r300->vbo, NULL);
  84
  85     /* Vertex buffers. */
  86     for (i = 0; i < r300->vertex_buffer_count; i++) {
  87         pipe_resource_reference(&r300->vertex_buffer[i].buffer, NULL);
  88     }
  89
  90     /* If there are any queries pending or not destroyed, remove them now. */
  91     foreach_s(query, temp, &r300->query_list) {
  92         remove_from_list(query);
  93         FREE(query);
  94     }
  95 }
  96
  97 static void r300_destroy_context(struct pipe_context* context)
  98 {
  99     struct r300_context* r300 = r300_context(context);
 100     struct r300_atom *atom;
 101
 102     if (r300->blitter)
 103         util_blitter_destroy(r300->blitter);
 104     if (r300->draw)
 105         draw_destroy(r300->draw);
 106
 107     /* Print stats, if enabled. */
 108     if (SCREEN_DBG_ON(r300->screen, DBG_STATS)) {
 109         fprintf(stderr, "r300: Stats for context %p:\n", r300);
 110         fprintf(stderr, "    : Flushes: %" PRIu64 "\n", r300->flush_counter);
 111         foreach(atom, &r300->atom_list) {
 112             fprintf(stderr, "    : %s: %" PRIu64 " emits\n",
 113                 atom->name, atom->counter);
 114         }
 115     }
 116
 117     if (r300->upload_vb)
 118         u_upload_destroy(r300->upload_vb);
 119     if (r300->upload_ib)
 120         u_upload_destroy(r300->upload_ib);
 121
 122     if (r300->tran.translate_cache)
 123         translate_cache_destroy(r300->tran.translate_cache);
 124
 125     /* XXX: This function assumes r300->query_list was initialized */
 126     r300_release_referenced_objects(r300);
 127
 128     if (r300->zmask_mm)
 129         r300_hyperz_destroy_mm(r300);
 130
 131     if (r300->cs)
 132         r300->rws->cs_destroy(r300->cs);
 133
 134     /* XXX: No way to tell if this was initialized or not? */
 135     util_mempool_destroy(&r300->pool_transfers);
 136
 137     r300_update_num_contexts(r300->screen, -1);
 138
 139     /* Free the structs allocated in r300_setup_atoms() */
 140     if (r300->aa_state.state) {
 141         FREE(r300->aa_state.state);
 142         FREE(r300->blend_color_state.state);
 143         FREE(r300->clip_state.state);
 144         FREE(r300->fb_state.state);
 145         FREE(r300->gpu_flush.state);
 146         FREE(r300->hyperz_state.state);
 147         FREE(r300->invariant_state.state);
 148         FREE(r300->rs_block_state.state);
 149         FREE(r300->scissor_state.state);
 150         FREE(r300->textures_state.state);
 151         FREE(r300->vap_invariant_state.state);
 152         FREE(r300->viewport_state.state);
 153         FREE(r300->ztop_state.state);
 154         FREE(r300->fs_constants.state);
 155         FREE(r300->vs_constants.state);
 156         if (!r300->screen->caps.has_tcl) {
 157             FREE(r300->vertex_stream_state.state);
 158         }
 159     }
 160     FREE(r300);
 161 }
 162
 163 void r300_flush_cb(void *data)
 164 {
 165     struct r300_context* const cs_context_copy = data;
 166
 167     cs_context_copy->context.flush(&cs_context_copy->context, 0, NULL);
 168 }
 169
 170 #define R300_INIT_ATOM(atomname, atomsize) \
 171  do { \
 172     r300->atomname.name = #atomname; \
 173     r300->atomname.state = NULL; \
 174     r300->atomname.size = atomsize; \
 175     r300->atomname.emit = r300_emit_##atomname; \
 176     r300->atomname.dirty = FALSE; \
 177     insert_at_tail(&r300->atom_list, &r300->atomname); \
 178  } while (0)
 179
 180 static void r300_setup_atoms(struct r300_context* r300)
 181 {
 182     boolean is_rv350 = r300->screen->caps.is_rv350;
 183     boolean is_r500 = r300->screen->caps.is_r500;
 184     boolean has_tcl = r300->screen->caps.has_tcl;
 185     boolean drm_2_3_0 = r300->rws->get_value(r300->rws, R300_VID_DRM_2_3_0);
 186     boolean drm_2_6_0 = r300->rws->get_value(r300->rws, R300_VID_DRM_2_6_0);
 187     boolean can_hyperz = r300->rws->get_value(r300->rws, R300_CAN_HYPERZ);
 188     boolean has_hiz_ram = r300->screen->caps.hiz_ram > 0;
 189
 190     /* Create the actual atom list.
 191      *
 192      * Each atom is examined and emitted in the order it appears here, which
 193      * can affect performance and conformance if not handled with care.
 194      *
 195      * Some atoms never change size, others change every emit - those have
 196      * the size of 0 here.
 197      *
 198      * NOTE: The framebuffer state is split into these atoms:
 199      * - gpu_flush          (unpipelined regs)
 200      * - aa_state           (unpipelined regs)
 201      * - fb_state           (unpipelined regs)
 202      * - hyperz_state       (unpipelined regs followed by pipelined ones)
 203      * - fb_state_pipelined (pipelined regs)
 204      * The motivation behind this is to be able to emit a strict
 205      * subset of the regs, and to have reasonable register ordering. */
 206     make_empty_list(&r300->atom_list);
 207     /* SC, GB (unpipelined), RB3D (unpipelined), ZB (unpipelined). */
 208     R300_INIT_ATOM(gpu_flush, 9);
 209     R300_INIT_ATOM(aa_state, 4);
 210     R300_INIT_ATOM(fb_state, 0);
 211     R300_INIT_ATOM(hyperz_state, is_r500 || (is_rv350 && drm_2_6_0) ? 10 : 8);
 212     /* ZB (unpipelined), SC. */
 213     R300_INIT_ATOM(ztop_state, 2);
 214     /* ZB, FG. */
 215     R300_INIT_ATOM(dsa_state, is_r500 ? 8 : 6);
 216     /* RB3D. */
 217     R300_INIT_ATOM(blend_state, 8);
 218     R300_INIT_ATOM(blend_color_state, is_r500 ? 3 : 2);
 219     /* SC. */
 220     R300_INIT_ATOM(scissor_state, 3);
 221     /* GB, FG, GA, SU, SC, RB3D. */
 222     R300_INIT_ATOM(invariant_state, 16 + (is_rv350 ? 4 : 0));
 223     /* VAP. */
 224     R300_INIT_ATOM(viewport_state, 9);
 225     R300_INIT_ATOM(pvs_flush, 2);
 226     R300_INIT_ATOM(vap_invariant_state, 9);
 227     R300_INIT_ATOM(vertex_stream_state, 0);
 228     R300_INIT_ATOM(vs_state, 0);
 229     R300_INIT_ATOM(vs_constants, 0);
 230     R300_INIT_ATOM(clip_state, has_tcl ? 5 + (6 * 4) : 2);
 231     /* VAP, RS, GA, GB, SU, SC. */
 232     R300_INIT_ATOM(rs_block_state, 0);
 233     R300_INIT_ATOM(rs_state, 0);
 234     /* SC, US. */
 235     R300_INIT_ATOM(fb_state_pipelined, 5 + (drm_2_3_0 ? 3 : 0));
 236     /* US. */
 237     R300_INIT_ATOM(fs, 0);
 238     R300_INIT_ATOM(fs_rc_constant_state, 0);
 239     R300_INIT_ATOM(fs_constants, 0);
 240     /* TX. */
 241     R300_INIT_ATOM(texture_cache_inval, 2);
 242     R300_INIT_ATOM(textures_state, 0);
 243     if (can_hyperz) {
 244         /* HiZ Clear */
 245         if (has_hiz_ram)
 246             R300_INIT_ATOM(hiz_clear, 0);
 247         /* zmask clear */
 248         R300_INIT_ATOM(zmask_clear, 0);
 249     }
 250     /* ZB (unpipelined), SU. */
 251     R300_INIT_ATOM(query_start, 4);
 252
 253     /* Replace emission functions for r500. */
 254     if (is_r500) {
 255         r300->fs.emit = r500_emit_fs;
 256         r300->fs_rc_constant_state.emit = r500_emit_fs_rc_constant_state;
 257         r300->fs_constants.emit = r500_emit_fs_constants;
 258     }
 259
 260     /* Some non-CSO atoms need explicit space to store the state locally. */
 261     r300->aa_state.state = CALLOC_STRUCT(r300_aa_state);
 262     r300->blend_color_state.state = CALLOC_STRUCT(r300_blend_color_state);
 263     r300->clip_state.state = CALLOC_STRUCT(r300_clip_state);
 264     r300->fb_state.state = CALLOC_STRUCT(pipe_framebuffer_state);
 265     r300->gpu_flush.state = CALLOC_STRUCT(pipe_framebuffer_state);
 266     r300->hyperz_state.state = CALLOC_STRUCT(r300_hyperz_state);
 267     r300->invariant_state.state = CALLOC_STRUCT(r300_invariant_state);
 268     r300->rs_block_state.state = CALLOC_STRUCT(r300_rs_block);
 269     r300->scissor_state.state = CALLOC_STRUCT(pipe_scissor_state);
 270     r300->textures_state.state = CALLOC_STRUCT(r300_textures_state);
 271     r300->vap_invariant_state.state = CALLOC_STRUCT(r300_vap_invariant_state);
 272     r300->viewport_state.state = CALLOC_STRUCT(r300_viewport_state);
 273     r300->ztop_state.state = CALLOC_STRUCT(r300_ztop_state);
 274     r300->fs_constants.state = CALLOC_STRUCT(r300_constant_buffer);
 275     r300->vs_constants.state = CALLOC_STRUCT(r300_constant_buffer);
 276     if (!r300->screen->caps.has_tcl) {
 277         r300->vertex_stream_state.state = CALLOC_STRUCT(r300_vertex_stream_state);
 278     }
 279
 280     /* Some non-CSO atoms don't use the state pointer. */
 281     r300->fb_state_pipelined.allow_null_state = TRUE;
 282     r300->fs_rc_constant_state.allow_null_state = TRUE;
 283     r300->pvs_flush.allow_null_state = TRUE;
 284     r300->query_start.allow_null_state = TRUE;
 285     r300->texture_cache_inval.allow_null_state = TRUE;
 286
 287     /* Some states must be marked as dirty here to properly set up
 288      * hardware in the first command stream. */
 289     r300->invariant_state.dirty = TRUE;
 290     r300->pvs_flush.dirty = TRUE;
 291     r300->vap_invariant_state.dirty = TRUE;
 292     r300->texture_cache_inval.dirty = TRUE;
 293     r300->textures_state.dirty = TRUE;
 294 }
 295
 296 /* Not every state tracker calls every driver function before the first draw
 297  * call and we must initialize the command buffers somehow. */
 298 static void r300_init_states(struct pipe_context *pipe)
 299 {
 300     struct r300_context *r300 = r300_context(pipe);
 301     struct pipe_blend_color bc = {{0}};
 302     struct pipe_clip_state cs = {{{0}}};
 303     struct pipe_scissor_state ss = {0};
 304     struct r300_clip_state *clip =
 305             (struct r300_clip_state*)r300->clip_state.state;
 306     struct r300_gpu_flush *gpuflush =
 307             (struct r300_gpu_flush*)r300->gpu_flush.state;
 308     struct r300_vap_invariant_state *vap_invariant =
 309             (struct r300_vap_invariant_state*)r300->vap_invariant_state.state;
 310     struct r300_invariant_state *invariant =
 311             (struct r300_invariant_state*)r300->invariant_state.state;
 312
 313     CB_LOCALS;
 314
 315     pipe->set_blend_color(pipe, &bc);
 316     pipe->set_scissor_state(pipe, &ss);
 317
 318     /* Initialize the clip state. */
 319     if (r300_context(pipe)->screen->caps.has_tcl) {
 320         pipe->set_clip_state(pipe, &cs);
 321     } else {
 322         BEGIN_CB(clip->cb, 2);
 323         OUT_CB_REG(R300_VAP_CLIP_CNTL, R300_CLIP_DISABLE);
 324         END_CB;
 325     }
 326
 327     /* Initialize the GPU flush. */
 328     {
 329         BEGIN_CB(gpuflush->cb_flush_clean, 6);
 330
 331         /* Flush and free renderbuffer caches. */
 332         OUT_CB_REG(R300_RB3D_DSTCACHE_CTLSTAT,
 333             R300_RB3D_DSTCACHE_CTLSTAT_DC_FREE_FREE_3D_TAGS |
 334             R300_RB3D_DSTCACHE_CTLSTAT_DC_FLUSH_FLUSH_DIRTY_3D);
 335         OUT_CB_REG(R300_ZB_ZCACHE_CTLSTAT,
 336             R300_ZB_ZCACHE_CTLSTAT_ZC_FLUSH_FLUSH_AND_FREE |
 337             R300_ZB_ZCACHE_CTLSTAT_ZC_FREE_FREE);
 338
 339         /* Wait until the GPU is idle.
 340          * This fixes random pixels sometimes appearing probably caused
 341          * by incomplete rendering. */
 342         OUT_CB_REG(RADEON_WAIT_UNTIL, RADEON_WAIT_3D_IDLECLEAN);
 343         END_CB;
 344     }
 345
 346     /* Initialize the VAP invariant state. */
 347     {
 348         BEGIN_CB(vap_invariant->cb, 9);
 349         OUT_CB_REG(VAP_PVS_VTX_TIMEOUT_REG, 0xffff);
 350         OUT_CB_REG_SEQ(R300_VAP_GB_VERT_CLIP_ADJ, 4);
 351         OUT_CB_32F(1.0);
 352         OUT_CB_32F(1.0);
 353         OUT_CB_32F(1.0);
 354         OUT_CB_32F(1.0);
 355         OUT_CB_REG(R300_VAP_PSC_SGN_NORM_CNTL, R300_SGN_NORM_NO_ZERO);
 356         END_CB;
 357     }
 358
 359     /* Initialize the invariant state. */
 360     {
 361         BEGIN_CB(invariant->cb, r300->invariant_state.size);
 362         OUT_CB_REG(R300_GB_SELECT, 0);
 363         OUT_CB_REG(R300_FG_FOG_BLEND, 0);
 364         OUT_CB_REG(R300_GA_ROUND_MODE, 1);
 365         OUT_CB_REG(R300_GA_OFFSET, 0);
 366         OUT_CB_REG(R300_SU_TEX_WRAP, 0);
 367         OUT_CB_REG(R300_SU_DEPTH_SCALE, 0x4B7FFFFF);
 368         OUT_CB_REG(R300_SU_DEPTH_OFFSET, 0);
 369         OUT_CB_REG(R300_SC_EDGERULE, 0x2DA49525);
 370
 371         if (r300->screen->caps.is_rv350) {
 372             OUT_CB_REG(R500_RB3D_DISCARD_SRC_PIXEL_LTE_THRESHOLD, 0x01010101);
 373             OUT_CB_REG(R500_RB3D_DISCARD_SRC_PIXEL_GTE_THRESHOLD, 0xFEFEFEFE);
 374         }
 375         END_CB;
 376     }
 377
 378     /* Initialize the hyperz state. */
 379     {
 380         struct r300_hyperz_state *hyperz =
 381             (struct r300_hyperz_state*)r300->hyperz_state.state;
 382         BEGIN_CB(&hyperz->cb_flush_begin, r300->hyperz_state.size);
 383         OUT_CB_REG(R300_ZB_ZCACHE_CTLSTAT,
 384                    R300_ZB_ZCACHE_CTLSTAT_ZC_FLUSH_FLUSH_AND_FREE);
 385         OUT_CB_REG(R300_ZB_BW_CNTL, 0);
 386         OUT_CB_REG(R300_ZB_DEPTHCLEARVALUE, 0);
 387         OUT_CB_REG(R300_SC_HYPERZ, R300_SC_HYPERZ_ADJ_2);
 388
 389         if (r300->screen->caps.is_r500 ||
 390             (r300->screen->caps.is_rv350 &&
 391              r300->rws->get_value(r300->rws, R300_VID_DRM_2_6_0))) {
 392             OUT_CB_REG(R300_GB_Z_PEQ_CONFIG, 0);
 393         }
 394         END_CB;
 395     }
 396 }
 397
 398 struct pipe_context* r300_create_context(struct pipe_screen* screen,
 399                                          void *priv)
 400 {
 401     struct r300_context* r300 = CALLOC_STRUCT(r300_context);
 402     struct r300_screen* r300screen = r300_screen(screen);
 403     struct r300_winsys_screen *rws = r300screen->rws;
 404
 405     if (!r300)
 406         return NULL;
 407
 408     r300_update_num_contexts(r300screen, 1);
 409
 410     r300->rws = rws;
 411     r300->screen = r300screen;
 412
 413     r300->context.winsys = (struct pipe_winsys*)rws;
 414     r300->context.screen = screen;
 415     r300->context.priv = priv;
 416
 417     r300->context.destroy = r300_destroy_context;
 418
 419     make_empty_list(&r300->query_list);
 420
 421     util_mempool_create(&r300->pool_transfers,
 422                         sizeof(struct pipe_transfer), 64,
 423                         UTIL_MEMPOOL_SINGLETHREADED);
 424
 425     r300->cs = rws->cs_create(rws);
 426     if (r300->cs == NULL)
 427         goto fail;
 428
 429     if (!r300screen->caps.has_tcl) {
 430         /* Create a Draw. This is used for SW TCL. */
 431         r300->draw = draw_create(&r300->context);
 432         /* Enable our renderer. */
 433         draw_set_rasterize_stage(r300->draw, r300_draw_stage(r300));
 434         /* Disable converting points/lines to triangles. */
 435         draw_wide_line_threshold(r300->draw, 10000000.f);
 436         draw_wide_point_threshold(r300->draw, 10000000.f);
 437     }
 438
 439     r300_setup_atoms(r300);
 440
 441     r300_init_blit_functions(r300);
 442     r300_init_flush_functions(r300);
 443     r300_init_query_functions(r300);
 444     r300_init_state_functions(r300);
 445     r300_init_resource_functions(r300);
 446
 447     r300->blitter = util_blitter_create(&r300->context);
 448     if (r300->blitter == NULL)
 449         goto fail;
 450
 451     /* Render functions must be initialized after blitter. */
 452     r300_init_render_functions(r300);
 453
 454     rws->cs_set_flush(r300->cs, r300_flush_cb, r300);
 455
 456     /* setup hyper-z mm */
 457     if (r300->rws->get_value(r300->rws, R300_CAN_HYPERZ))
 458         if (!r300_hyperz_init_mm(r300))
 459             goto fail;
 460
 461     r300->upload_ib = u_upload_create(&r300->context,
 462                                       32 * 1024, 16,
 463                                       PIPE_BIND_INDEX_BUFFER);
 464
 465     if (r300->upload_ib == NULL)
 466         goto fail;
 467
 468     r300->upload_vb = u_upload_create(&r300->context,
 469                                       128 * 1024, 16,
 470                                       PIPE_BIND_VERTEX_BUFFER);
 471     if (r300->upload_vb == NULL)
 472         goto fail;
 473
 474     r300->tran.translate_cache = translate_cache_create();
 475     if (r300->tran.translate_cache == NULL)
 476         goto fail;
 477
 478     r300_init_states(&r300->context);
 479
 480     /* The KIL opcode needs the first texture unit to be enabled
 481      * on r3xx-r4xx. In order to calm down the CS checker, we bind this
 482      * dummy texture there. */
 483     if (!r300->screen->caps.is_r500) {
 484         struct pipe_resource *tex;
 485         struct pipe_resource rtempl = {{0}};
 486         struct pipe_sampler_view vtempl = {{0}};
 487
 488         rtempl.target = PIPE_TEXTURE_2D;
 489         rtempl.format = PIPE_FORMAT_I8_UNORM;
 490         rtempl.bind = PIPE_BIND_SAMPLER_VIEW;
 491         rtempl.width0 = 1;
 492         rtempl.height0 = 1;
 493         rtempl.depth0 = 1;
 494         tex = screen->resource_create(screen, &rtempl);
 495
 496         u_sampler_view_default_template(&vtempl, tex, tex->format);
 497
 498         r300->texkill_sampler = (struct r300_sampler_view*)
 499             r300->context.create_sampler_view(&r300->context, tex, &vtempl);
 500
 501         pipe_resource_reference(&tex, NULL);
 502     }
 503
 504     return &r300->context;
 505
 506  fail:
 507     r300_destroy_context(&r300->context);
 508     return NULL;
 509 }
 510
 511 void r300_finish(struct r300_context *r300)
 512 {
 513     struct pipe_framebuffer_state *fb;
 514     unsigned i;
 515
 516     /* This is a preliminary implementation of glFinish.
 517      *
 518      * The ideal implementation should use something like EmitIrqLocked and
 519      * WaitIrq, or better, real fences.
 520      */
 521     if (r300->fb_state.state) {
 522         fb = r300->fb_state.state;
 523
 524         for (i = 0; i < fb->nr_cbufs; i++) {
 525             if (fb->cbufs[i]->texture) {
 526                 r300->rws->buffer_wait(r300->rws,
 527                     r300_texture(fb->cbufs[i]->texture)->buffer);
 528                 return;
 529             }
 530         }
 531         if (fb->zsbuf && fb->zsbuf->texture) {
 532             r300->rws->buffer_wait(r300->rws,
 533                 r300_texture(fb->zsbuf->texture)->buffer);
 534         }
 535     }
 536 }