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 static void r300_update_num_contexts(struct r300_screen *r300screen,
  39                                      int diff)
  40 {
  41     if (diff > 0) {
  42         p_atomic_inc(&r300screen->num_contexts);
  43
  44         if (r300screen->num_contexts > 1)
  45             util_slab_set_thread_safety(&r300screen->pool_buffers,
  46                                         UTIL_SLAB_MULTITHREADED);
  47     } else {
  48         p_atomic_dec(&r300screen->num_contexts);
  49
  50         if (r300screen->num_contexts <= 1)
  51             util_slab_set_thread_safety(&r300screen->pool_buffers,
  52                                         UTIL_SLAB_SINGLETHREADED);
  53     }
  54 }
  55
  56 static void r300_release_referenced_objects(struct r300_context *r300)
  57 {
  58     struct pipe_framebuffer_state *fb =
  59             (struct pipe_framebuffer_state*)r300->fb_state.state;
  60     struct r300_textures_state *textures =
  61             (struct r300_textures_state*)r300->textures_state.state;
  62     struct r300_query *query, *temp;
  63     unsigned i;
  64
  65     /* Framebuffer state. */
  66     util_unreference_framebuffer_state(fb);
  67
  68     /* Textures. */
  69     for (i = 0; i < textures->sampler_view_count; i++)
  70         pipe_sampler_view_reference(
  71                 (struct pipe_sampler_view**)&textures->sampler_views[i], NULL);
  72
  73     /* The special dummy texture for texkill. */
  74     if (r300->texkill_sampler) {
  75         pipe_sampler_view_reference(
  76                 (struct pipe_sampler_view**)&r300->texkill_sampler,
  77                 NULL);
  78     }
  79
  80     /* The dummy VBO. */
  81     pipe_resource_reference(&r300->dummy_vb, NULL);
  82
  83     /* The SWTCL VBO. */
  84     pipe_resource_reference(&r300->vbo, NULL);
  85
  86     /* Vertex buffers. */
  87     for (i = 0; i < r300->vertex_buffer_count; i++) {
  88         pipe_resource_reference(&r300->vertex_buffer[i].buffer, NULL);
  89     }
  90
  91     /* If there are any queries pending or not destroyed, remove them now. */
  92     foreach_s(query, temp, &r300->query_list) {
  93         remove_from_list(query);
  94         FREE(query);
  95     }
  96 }
  97
  98 static void r300_destroy_context(struct pipe_context* context)
  99 {
 100     struct r300_context* r300 = r300_context(context);
 101
 102     if (r300->blitter)
 103         util_blitter_destroy(r300->blitter);
 104     if (r300->draw)
 105         draw_destroy(r300->draw);
 106
 107     if (r300->upload_vb)
 108         u_upload_destroy(r300->upload_vb);
 109     if (r300->upload_ib)
 110         u_upload_destroy(r300->upload_ib);
 111
 112     if (r300->tran.translate_cache)
 113         translate_cache_destroy(r300->tran.translate_cache);
 114
 115     /* XXX: This function assumes r300->query_list was initialized */
 116     r300_release_referenced_objects(r300);
 117
 118     if (r300->zmask_mm)
 119         r300_hyperz_destroy_mm(r300);
 120
 121     if (r300->cs)
 122         r300->rws->cs_destroy(r300->cs);
 123
 124     /* XXX: No way to tell if this was initialized or not? */
 125     util_slab_destroy(&r300->pool_transfers);
 126
 127     r300_update_num_contexts(r300->screen, -1);
 128
 129     /* Free the structs allocated in r300_setup_atoms() */
 130     if (r300->aa_state.state) {
 131         FREE(r300->aa_state.state);
 132         FREE(r300->blend_color_state.state);
 133         FREE(r300->clip_state.state);
 134         FREE(r300->fb_state.state);
 135         FREE(r300->gpu_flush.state);
 136         FREE(r300->hyperz_state.state);
 137         FREE(r300->invariant_state.state);
 138         FREE(r300->rs_block_state.state);
 139         FREE(r300->scissor_state.state);
 140         FREE(r300->textures_state.state);
 141         FREE(r300->vap_invariant_state.state);
 142         FREE(r300->viewport_state.state);
 143         FREE(r300->ztop_state.state);
 144         FREE(r300->fs_constants.state);
 145         FREE(r300->vs_constants.state);
 146         if (!r300->screen->caps.has_tcl) {
 147             FREE(r300->vertex_stream_state.state);
 148         }
 149     }
 150     FREE(r300);
 151 }
 152
 153 void r300_flush_cb(void *data)
 154 {
 155     struct r300_context* const cs_context_copy = data;
 156
 157     cs_context_copy->context.flush(&cs_context_copy->context, 0, NULL);
 158 }
 159
 160 #define R300_INIT_ATOM(atomname, atomsize) \
 161  do { \
 162     r300->atomname.name = #atomname; \
 163     r300->atomname.state = NULL; \
 164     r300->atomname.size = atomsize; \
 165     r300->atomname.emit = r300_emit_##atomname; \
 166     r300->atomname.dirty = FALSE; \
 167  } while (0)
 168
 169 #define R300_ALLOC_ATOM(atomname, statetype) \
 170 do { \
 171     r300->atomname.state = CALLOC_STRUCT(statetype); \
 172     if (r300->atomname.state == NULL) \
 173         return FALSE; \
 174 } while (0)
 175
 176 static boolean r300_setup_atoms(struct r300_context* r300)
 177 {
 178     boolean is_rv350 = r300->screen->caps.is_rv350;
 179     boolean is_r500 = r300->screen->caps.is_r500;
 180     boolean has_tcl = r300->screen->caps.has_tcl;
 181     boolean drm_2_3_0 = r300->rws->get_value(r300->rws, R300_VID_DRM_2_3_0);
 182     boolean drm_2_6_0 = r300->rws->get_value(r300->rws, R300_VID_DRM_2_6_0);
 183     boolean can_hyperz = r300->rws->get_value(r300->rws, R300_CAN_HYPERZ);
 184     boolean has_hiz_ram = r300->screen->caps.hiz_ram > 0;
 185
 186     /* Create the actual atom list.
 187      *
 188      * Some atoms never change size, others change every emit - those have
 189      * the size of 0 here.
 190      *
 191      * NOTE: The framebuffer state is split into these atoms:
 192      * - gpu_flush          (unpipelined regs)
 193      * - aa_state           (unpipelined regs)
 194      * - fb_state           (unpipelined regs)
 195      * - hyperz_state       (unpipelined regs followed by pipelined ones)
 196      * - fb_state_pipelined (pipelined regs)
 197      * The motivation behind this is to be able to emit a strict
 198      * subset of the regs, and to have reasonable register ordering. */
 199     /* SC, GB (unpipelined), RB3D (unpipelined), ZB (unpipelined). */
 200     R300_INIT_ATOM(gpu_flush, 9);
 201     R300_INIT_ATOM(aa_state, 4);
 202     R300_INIT_ATOM(fb_state, 0);
 203     R300_INIT_ATOM(hyperz_state, is_r500 || (is_rv350 && drm_2_6_0) ? 10 : 8);
 204     /* ZB (unpipelined), SC. */
 205     R300_INIT_ATOM(ztop_state, 2);
 206     /* ZB, FG. */
 207     R300_INIT_ATOM(dsa_state, is_r500 ? 8 : 6);
 208     /* RB3D. */
 209     R300_INIT_ATOM(blend_state, 8);
 210     R300_INIT_ATOM(blend_color_state, is_r500 ? 3 : 2);
 211     /* SC. */
 212     R300_INIT_ATOM(scissor_state, 3);
 213     /* GB, FG, GA, SU, SC, RB3D. */
 214     R300_INIT_ATOM(invariant_state, 16 + (is_rv350 ? 4 : 0));
 215     /* VAP. */
 216     R300_INIT_ATOM(viewport_state, 9);
 217     R300_INIT_ATOM(pvs_flush, 2);
 218     R300_INIT_ATOM(vap_invariant_state, 9);
 219     R300_INIT_ATOM(vertex_stream_state, 0);
 220     R300_INIT_ATOM(vs_state, 0);
 221     R300_INIT_ATOM(vs_constants, 0);
 222     R300_INIT_ATOM(clip_state, has_tcl ? 5 + (6 * 4) : 2);
 223     /* VAP, RS, GA, GB, SU, SC. */
 224     R300_INIT_ATOM(rs_block_state, 0);
 225     R300_INIT_ATOM(rs_state, 0);
 226     /* SC, US. */
 227     R300_INIT_ATOM(fb_state_pipelined, 5 + (drm_2_3_0 ? 3 : 0));
 228     /* US. */
 229     R300_INIT_ATOM(fs, 0);
 230     R300_INIT_ATOM(fs_rc_constant_state, 0);
 231     R300_INIT_ATOM(fs_constants, 0);
 232     /* TX. */
 233     R300_INIT_ATOM(texture_cache_inval, 2);
 234     R300_INIT_ATOM(textures_state, 0);
 235     if (can_hyperz) {
 236         /* HiZ Clear */
 237         if (has_hiz_ram)
 238             R300_INIT_ATOM(hiz_clear, 0);
 239         /* zmask clear */
 240         R300_INIT_ATOM(zmask_clear, 0);
 241     }
 242     /* ZB (unpipelined), SU. */
 243     R300_INIT_ATOM(query_start, 4);
 244
 245     /* Replace emission functions for r500. */
 246     if (is_r500) {
 247         r300->fs.emit = r500_emit_fs;
 248         r300->fs_rc_constant_state.emit = r500_emit_fs_rc_constant_state;
 249         r300->fs_constants.emit = r500_emit_fs_constants;
 250     }
 251
 252     /* Some non-CSO atoms need explicit space to store the state locally. */
 253     R300_ALLOC_ATOM(aa_state, r300_aa_state);
 254     R300_ALLOC_ATOM(blend_color_state, r300_blend_color_state);
 255     R300_ALLOC_ATOM(clip_state, r300_clip_state);
 256     R300_ALLOC_ATOM(hyperz_state, r300_hyperz_state);
 257     R300_ALLOC_ATOM(invariant_state, r300_invariant_state);
 258     R300_ALLOC_ATOM(textures_state, r300_textures_state);
 259     R300_ALLOC_ATOM(vap_invariant_state, r300_vap_invariant_state);
 260     R300_ALLOC_ATOM(viewport_state, r300_viewport_state);
 261     R300_ALLOC_ATOM(ztop_state, r300_ztop_state);
 262     R300_ALLOC_ATOM(fb_state, pipe_framebuffer_state);
 263     R300_ALLOC_ATOM(gpu_flush, pipe_framebuffer_state);
 264     R300_ALLOC_ATOM(scissor_state, pipe_scissor_state);
 265     R300_ALLOC_ATOM(rs_block_state, r300_rs_block);
 266     R300_ALLOC_ATOM(fs_constants, r300_constant_buffer);
 267     R300_ALLOC_ATOM(vs_constants, r300_constant_buffer);
 268     if (!r300->screen->caps.has_tcl) {
 269         R300_ALLOC_ATOM(vertex_stream_state, r300_vertex_stream_state);
 270     }
 271
 272     /* Some non-CSO atoms don't use the state pointer. */
 273     r300->fb_state_pipelined.allow_null_state = TRUE;
 274     r300->fs_rc_constant_state.allow_null_state = TRUE;
 275     r300->pvs_flush.allow_null_state = TRUE;
 276     r300->query_start.allow_null_state = TRUE;
 277     r300->texture_cache_inval.allow_null_state = TRUE;
 278
 279     /* Some states must be marked as dirty here to properly set up
 280      * hardware in the first command stream. */
 281     r300_mark_atom_dirty(r300, &r300->invariant_state);
 282     r300_mark_atom_dirty(r300, &r300->pvs_flush);
 283     r300_mark_atom_dirty(r300, &r300->vap_invariant_state);
 284     r300_mark_atom_dirty(r300, &r300->texture_cache_inval);
 285     r300_mark_atom_dirty(r300, &r300->textures_state);
 286
 287     return TRUE;
 288 }
 289
 290 /* Not every state tracker calls every driver function before the first draw
 291  * call and we must initialize the command buffers somehow. */
 292 static void r300_init_states(struct pipe_context *pipe)
 293 {
 294     struct r300_context *r300 = r300_context(pipe);
 295     struct pipe_blend_color bc = {{0}};
 296     struct pipe_clip_state cs = {{{0}}};
 297     struct pipe_scissor_state ss = {0};
 298     struct r300_clip_state *clip =
 299             (struct r300_clip_state*)r300->clip_state.state;
 300     struct r300_gpu_flush *gpuflush =
 301             (struct r300_gpu_flush*)r300->gpu_flush.state;
 302     struct r300_vap_invariant_state *vap_invariant =
 303             (struct r300_vap_invariant_state*)r300->vap_invariant_state.state;
 304     struct r300_invariant_state *invariant =
 305             (struct r300_invariant_state*)r300->invariant_state.state;
 306
 307     CB_LOCALS;
 308
 309     pipe->set_blend_color(pipe, &bc);
 310     pipe->set_scissor_state(pipe, &ss);
 311
 312     /* Initialize the clip state. */
 313     if (r300->screen->caps.has_tcl) {
 314         pipe->set_clip_state(pipe, &cs);
 315     } else {
 316         BEGIN_CB(clip->cb, 2);
 317         OUT_CB_REG(R300_VAP_CLIP_CNTL, R300_CLIP_DISABLE);
 318         END_CB;
 319     }
 320
 321     /* Initialize the GPU flush. */
 322     {
 323         BEGIN_CB(gpuflush->cb_flush_clean, 6);
 324
 325         /* Flush and free renderbuffer caches. */
 326         OUT_CB_REG(R300_RB3D_DSTCACHE_CTLSTAT,
 327             R300_RB3D_DSTCACHE_CTLSTAT_DC_FREE_FREE_3D_TAGS |
 328             R300_RB3D_DSTCACHE_CTLSTAT_DC_FLUSH_FLUSH_DIRTY_3D);
 329         OUT_CB_REG(R300_ZB_ZCACHE_CTLSTAT,
 330             R300_ZB_ZCACHE_CTLSTAT_ZC_FLUSH_FLUSH_AND_FREE |
 331             R300_ZB_ZCACHE_CTLSTAT_ZC_FREE_FREE);
 332
 333         /* Wait until the GPU is idle.
 334          * This fixes random pixels sometimes appearing probably caused
 335          * by incomplete rendering. */
 336         OUT_CB_REG(RADEON_WAIT_UNTIL, RADEON_WAIT_3D_IDLECLEAN);
 337         END_CB;
 338     }
 339
 340     /* Initialize the VAP invariant state. */
 341     {
 342         BEGIN_CB(vap_invariant->cb, 9);
 343         OUT_CB_REG(VAP_PVS_VTX_TIMEOUT_REG, 0xffff);
 344         OUT_CB_REG_SEQ(R300_VAP_GB_VERT_CLIP_ADJ, 4);
 345         OUT_CB_32F(1.0);
 346         OUT_CB_32F(1.0);
 347         OUT_CB_32F(1.0);
 348         OUT_CB_32F(1.0);
 349         OUT_CB_REG(R300_VAP_PSC_SGN_NORM_CNTL, R300_SGN_NORM_NO_ZERO);
 350         END_CB;
 351     }
 352
 353     /* Initialize the invariant state. */
 354     {
 355         BEGIN_CB(invariant->cb, r300->invariant_state.size);
 356         OUT_CB_REG(R300_GB_SELECT, 0);
 357         OUT_CB_REG(R300_FG_FOG_BLEND, 0);
 358         OUT_CB_REG(R300_GA_ROUND_MODE, 1);
 359         OUT_CB_REG(R300_GA_OFFSET, 0);
 360         OUT_CB_REG(R300_SU_TEX_WRAP, 0);
 361         OUT_CB_REG(R300_SU_DEPTH_SCALE, 0x4B7FFFFF);
 362         OUT_CB_REG(R300_SU_DEPTH_OFFSET, 0);
 363         OUT_CB_REG(R300_SC_EDGERULE, 0x2DA49525);
 364
 365         if (r300->screen->caps.is_rv350) {
 366             OUT_CB_REG(R500_RB3D_DISCARD_SRC_PIXEL_LTE_THRESHOLD, 0x01010101);
 367             OUT_CB_REG(R500_RB3D_DISCARD_SRC_PIXEL_GTE_THRESHOLD, 0xFEFEFEFE);
 368         }
 369         END_CB;
 370     }
 371
 372     /* Initialize the hyperz state. */
 373     {
 374         struct r300_hyperz_state *hyperz =
 375             (struct r300_hyperz_state*)r300->hyperz_state.state;
 376         BEGIN_CB(&hyperz->cb_flush_begin, r300->hyperz_state.size);
 377         OUT_CB_REG(R300_ZB_ZCACHE_CTLSTAT,
 378                    R300_ZB_ZCACHE_CTLSTAT_ZC_FLUSH_FLUSH_AND_FREE);
 379         OUT_CB_REG(R300_ZB_BW_CNTL, 0);
 380         OUT_CB_REG(R300_ZB_DEPTHCLEARVALUE, 0);
 381         OUT_CB_REG(R300_SC_HYPERZ, R300_SC_HYPERZ_ADJ_2);
 382
 383         if (r300->screen->caps.is_r500 ||
 384             (r300->screen->caps.is_rv350 &&
 385              r300->rws->get_value(r300->rws, R300_VID_DRM_2_6_0))) {
 386             OUT_CB_REG(R300_GB_Z_PEQ_CONFIG, 0);
 387         }
 388         END_CB;
 389     }
 390 }
 391
 392 struct pipe_context* r300_create_context(struct pipe_screen* screen,
 393                                          void *priv)
 394 {
 395     struct r300_context* r300 = CALLOC_STRUCT(r300_context);
 396     struct r300_screen* r300screen = r300_screen(screen);
 397     struct r300_winsys_screen *rws = r300screen->rws;
 398
 399     if (!r300)
 400         return NULL;
 401
 402     r300_update_num_contexts(r300screen, 1);
 403
 404     r300->rws = rws;
 405     r300->screen = r300screen;
 406
 407     r300->context.winsys = (struct pipe_winsys*)rws;
 408     r300->context.screen = screen;
 409     r300->context.priv = priv;
 410
 411     r300->context.destroy = r300_destroy_context;
 412
 413     make_empty_list(&r300->query_list);
 414
 415     util_slab_create(&r300->pool_transfers,
 416                      sizeof(struct pipe_transfer), 64,
 417                      UTIL_SLAB_SINGLETHREADED);
 418
 419     r300->cs = rws->cs_create(rws);
 420     if (r300->cs == NULL)
 421         goto fail;
 422
 423     if (!r300screen->caps.has_tcl) {
 424         /* Create a Draw. This is used for SW TCL. */
 425         r300->draw = draw_create(&r300->context);
 426         if (r300->draw == NULL)
 427             goto fail;
 428         /* Enable our renderer. */
 429         draw_set_rasterize_stage(r300->draw, r300_draw_stage(r300));
 430         /* Disable converting points/lines to triangles. */
 431         draw_wide_line_threshold(r300->draw, 10000000.f);
 432         draw_wide_point_threshold(r300->draw, 10000000.f);
 433     }
 434
 435     if (!r300_setup_atoms(r300))
 436         goto fail;
 437
 438     r300_init_blit_functions(r300);
 439     r300_init_flush_functions(r300);
 440     r300_init_query_functions(r300);
 441     r300_init_state_functions(r300);
 442     r300_init_resource_functions(r300);
 443
 444     r300->blitter = util_blitter_create(&r300->context);
 445     if (r300->blitter == NULL)
 446         goto fail;
 447
 448     /* Render functions must be initialized after blitter. */
 449     r300_init_render_functions(r300);
 450
 451     rws->cs_set_flush(r300->cs, r300_flush_cb, r300);
 452
 453     /* setup hyper-z mm */
 454     if (r300->rws->get_value(r300->rws, R300_CAN_HYPERZ))
 455         if (!r300_hyperz_init_mm(r300))
 456             goto fail;
 457
 458     r300->upload_ib = u_upload_create(&r300->context,
 459                                       32 * 1024, 16,
 460                                       PIPE_BIND_INDEX_BUFFER);
 461
 462     if (r300->upload_ib == NULL)
 463         goto fail;
 464
 465     r300->upload_vb = u_upload_create(&r300->context,
 466                                       128 * 1024, 16,
 467                                       PIPE_BIND_VERTEX_BUFFER);
 468     if (r300->upload_vb == NULL)
 469         goto fail;
 470
 471     r300->tran.translate_cache = translate_cache_create();
 472     if (r300->tran.translate_cache == NULL)
 473         goto fail;
 474
 475     r300_init_states(&r300->context);
 476
 477     /* The KIL opcode needs the first texture unit to be enabled
 478      * on r3xx-r4xx. In order to calm down the CS checker, we bind this
 479      * dummy texture there. */
 480     if (!r300->screen->caps.is_r500) {
 481         struct pipe_resource *tex;
 482         struct pipe_resource rtempl = {{0}};
 483         struct pipe_sampler_view vtempl = {{0}};
 484
 485         rtempl.target = PIPE_TEXTURE_2D;
 486         rtempl.format = PIPE_FORMAT_I8_UNORM;
 487         rtempl.bind = PIPE_BIND_SAMPLER_VIEW;
 488         rtempl.usage = PIPE_USAGE_IMMUTABLE;
 489         rtempl.width0 = 1;
 490         rtempl.height0 = 1;
 491         rtempl.depth0 = 1;
 492         tex = screen->resource_create(screen, &rtempl);
 493
 494         u_sampler_view_default_template(&vtempl, tex, tex->format);
 495
 496         r300->texkill_sampler = (struct r300_sampler_view*)
 497             r300->context.create_sampler_view(&r300->context, tex, &vtempl);
 498
 499         pipe_resource_reference(&tex, NULL);
 500     }
 501
 502     {
 503         struct pipe_resource vb = {};
 504         vb.target = PIPE_BUFFER;
 505         vb.format = PIPE_FORMAT_R8_UNORM;
 506         vb.bind = PIPE_BIND_VERTEX_BUFFER;
 507         vb.usage = PIPE_USAGE_IMMUTABLE;
 508         vb.width0 = sizeof(float) * 16;
 509         vb.height0 = 1;
 510         vb.depth0 = 1;
 511
 512         r300->dummy_vb = screen->resource_create(screen, &vb);
 513     }
 514
 515     return &r300->context;
 516
 517  fail:
 518     r300_destroy_context(&r300->context);
 519     return NULL;
 520 }
 521
 522 void r300_finish(struct r300_context *r300)
 523 {
 524     struct pipe_framebuffer_state *fb;
 525     unsigned i;
 526
 527     /* This is a preliminary implementation of glFinish.
 528      *
 529      * The ideal implementation should use something like EmitIrqLocked and
 530      * WaitIrq, or better, real fences.
 531      */
 532     if (r300->fb_state.state) {
 533         fb = r300->fb_state.state;
 534
 535         for (i = 0; i < fb->nr_cbufs; i++) {
 536             if (fb->cbufs[i]->texture) {
 537                 r300->rws->buffer_wait(r300->rws,
 538                     r300_texture(fb->cbufs[i]->texture)->buffer);
 539                 return;
 540             }
 541         }
 542         if (fb->zsbuf && fb->zsbuf->texture) {
 543             r300->rws->buffer_wait(r300->rws,
 544                 r300_texture(fb->zsbuf->texture)->buffer);
 545         }
 546     }
 547 }