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         pipe_resource_reference(&r300->valid_vertex_buffer[i], NULL);
  90     }
  91
  92     /* If there are any queries pending or not destroyed, remove them now. */
  93     foreach_s(query, temp, &r300->query_list) {
  94         remove_from_list(query);
  95         FREE(query);
  96     }
  97
  98     r300->context.delete_depth_stencil_alpha_state(&r300->context,
  99                                                    r300->dsa_decompress_zmask);
 100 }
 101
 102 static void r300_destroy_context(struct pipe_context* context)
 103 {
 104     struct r300_context* r300 = r300_context(context);
 105
 106     if (r300->blitter)
 107         util_blitter_destroy(r300->blitter);
 108     if (r300->draw)
 109         draw_destroy(r300->draw);
 110
 111     if (r300->upload_vb)
 112         u_upload_destroy(r300->upload_vb);
 113     if (r300->upload_ib)
 114         u_upload_destroy(r300->upload_ib);
 115
 116     if (r300->tran.translate_cache)
 117         translate_cache_destroy(r300->tran.translate_cache);
 118
 119     /* XXX: This function assumes r300->query_list was initialized */
 120     r300_release_referenced_objects(r300);
 121
 122     if (r300->cs)
 123         r300->rws->cs_destroy(r300->cs);
 124
 125     /* XXX: No way to tell if this was initialized or not? */
 126     util_slab_destroy(&r300->pool_transfers);
 127
 128     r300_update_num_contexts(r300->screen, -1);
 129
 130     /* Free the structs allocated in r300_setup_atoms() */
 131     if (r300->aa_state.state) {
 132         FREE(r300->aa_state.state);
 133         FREE(r300->blend_color_state.state);
 134         FREE(r300->clip_state.state);
 135         FREE(r300->fb_state.state);
 136         FREE(r300->gpu_flush.state);
 137         FREE(r300->hyperz_state.state);
 138         FREE(r300->invariant_state.state);
 139         FREE(r300->rs_block_state.state);
 140         FREE(r300->scissor_state.state);
 141         FREE(r300->textures_state.state);
 142         FREE(r300->vap_invariant_state.state);
 143         FREE(r300->viewport_state.state);
 144         FREE(r300->ztop_state.state);
 145         FREE(r300->fs_constants.state);
 146         FREE(r300->vs_constants.state);
 147         if (!r300->screen->caps.has_tcl) {
 148             FREE(r300->vertex_stream_state.state);
 149         }
 150     }
 151     FREE(r300);
 152 }
 153
 154 void r300_flush_cb(void *data)
 155 {
 156     struct r300_context* const cs_context_copy = data;
 157
 158     cs_context_copy->context.flush(&cs_context_copy->context, 0, NULL);
 159 }
 160
 161 #define R300_INIT_ATOM(atomname, atomsize) \
 162  do { \
 163     r300->atomname.name = #atomname; \
 164     r300->atomname.state = NULL; \
 165     r300->atomname.size = atomsize; \
 166     r300->atomname.emit = r300_emit_##atomname; \
 167     r300->atomname.dirty = FALSE; \
 168  } while (0)
 169
 170 #define R300_ALLOC_ATOM(atomname, statetype) \
 171 do { \
 172     r300->atomname.state = CALLOC_STRUCT(statetype); \
 173     if (r300->atomname.state == NULL) \
 174         return FALSE; \
 175 } while (0)
 176
 177 static boolean r300_setup_atoms(struct r300_context* r300)
 178 {
 179     boolean is_rv350 = r300->screen->caps.is_rv350;
 180     boolean is_r500 = r300->screen->caps.is_r500;
 181     boolean has_tcl = r300->screen->caps.has_tcl;
 182     boolean drm_2_3_0 = r300->rws->get_value(r300->rws, R300_VID_DRM_2_3_0);
 183     boolean drm_2_6_0 = r300->rws->get_value(r300->rws, R300_VID_DRM_2_6_0);
 184     boolean can_hyperz = r300->rws->get_value(r300->rws, R300_CAN_HYPERZ);
 185     boolean has_hiz_ram = r300->screen->caps.hiz_ram > 0;
 186
 187     /* Create the actual atom list.
 188      *
 189      * Some atoms never change size, others change every emit - those have
 190      * the size of 0 here.
 191      *
 192      * NOTE: The framebuffer state is split into these atoms:
 193      * - gpu_flush          (unpipelined regs)
 194      * - aa_state           (unpipelined regs)
 195      * - fb_state           (unpipelined regs)
 196      * - hyperz_state       (unpipelined regs followed by pipelined ones)
 197      * - fb_state_pipelined (pipelined regs)
 198      * The motivation behind this is to be able to emit a strict
 199      * subset of the regs, and to have reasonable register ordering. */
 200     /* SC, GB (unpipelined), RB3D (unpipelined), ZB (unpipelined). */
 201     R300_INIT_ATOM(gpu_flush, 9);
 202     R300_INIT_ATOM(aa_state, 4);
 203     R300_INIT_ATOM(fb_state, 0);
 204     R300_INIT_ATOM(hyperz_state, is_r500 || (is_rv350 && drm_2_6_0) ? 10 : 8);
 205     /* ZB (unpipelined), SC. */
 206     R300_INIT_ATOM(ztop_state, 2);
 207     /* ZB, FG. */
 208     R300_INIT_ATOM(dsa_state, is_r500 ? 8 : 6);
 209     /* RB3D. */
 210     R300_INIT_ATOM(blend_state, 8);
 211     R300_INIT_ATOM(blend_color_state, is_r500 ? 3 : 2);
 212     /* SC. */
 213     R300_INIT_ATOM(scissor_state, 3);
 214     /* GB, FG, GA, SU, SC, RB3D. */
 215     R300_INIT_ATOM(invariant_state, 16 + (is_rv350 ? 4 : 0));
 216     /* VAP. */
 217     R300_INIT_ATOM(viewport_state, 9);
 218     R300_INIT_ATOM(pvs_flush, 2);
 219     R300_INIT_ATOM(vap_invariant_state, 9);
 220     R300_INIT_ATOM(vertex_stream_state, 0);
 221     R300_INIT_ATOM(vs_state, 0);
 222     R300_INIT_ATOM(vs_constants, 0);
 223     R300_INIT_ATOM(clip_state, has_tcl ? 5 + (6 * 4) : 2);
 224     /* VAP, RS, GA, GB, SU, SC. */
 225     R300_INIT_ATOM(rs_block_state, 0);
 226     R300_INIT_ATOM(rs_state, 0);
 227     /* SC, US. */
 228     R300_INIT_ATOM(fb_state_pipelined, 5 + (drm_2_3_0 ? 3 : 0));
 229     /* US. */
 230     R300_INIT_ATOM(fs, 0);
 231     R300_INIT_ATOM(fs_rc_constant_state, 0);
 232     R300_INIT_ATOM(fs_constants, 0);
 233     /* TX. */
 234     R300_INIT_ATOM(texture_cache_inval, 2);
 235     R300_INIT_ATOM(textures_state, 0);
 236     if (can_hyperz) {
 237         /* HiZ Clear */
 238         if (has_hiz_ram)
 239             R300_INIT_ATOM(hiz_clear, 0);
 240         /* zmask clear */
 241         R300_INIT_ATOM(zmask_clear, 4);
 242     }
 243     /* ZB (unpipelined), SU. */
 244     R300_INIT_ATOM(query_start, 4);
 245
 246     /* Replace emission functions for r500. */
 247     if (is_r500) {
 248         r300->fs.emit = r500_emit_fs;
 249         r300->fs_rc_constant_state.emit = r500_emit_fs_rc_constant_state;
 250         r300->fs_constants.emit = r500_emit_fs_constants;
 251     }
 252
 253     /* Some non-CSO atoms need explicit space to store the state locally. */
 254     R300_ALLOC_ATOM(aa_state, r300_aa_state);
 255     R300_ALLOC_ATOM(blend_color_state, r300_blend_color_state);
 256     R300_ALLOC_ATOM(clip_state, r300_clip_state);
 257     R300_ALLOC_ATOM(hyperz_state, r300_hyperz_state);
 258     R300_ALLOC_ATOM(invariant_state, r300_invariant_state);
 259     R300_ALLOC_ATOM(textures_state, r300_textures_state);
 260     R300_ALLOC_ATOM(vap_invariant_state, r300_vap_invariant_state);
 261     R300_ALLOC_ATOM(viewport_state, r300_viewport_state);
 262     R300_ALLOC_ATOM(ztop_state, r300_ztop_state);
 263     R300_ALLOC_ATOM(fb_state, pipe_framebuffer_state);
 264     R300_ALLOC_ATOM(gpu_flush, pipe_framebuffer_state);
 265     R300_ALLOC_ATOM(scissor_state, pipe_scissor_state);
 266     R300_ALLOC_ATOM(rs_block_state, r300_rs_block);
 267     R300_ALLOC_ATOM(fs_constants, r300_constant_buffer);
 268     R300_ALLOC_ATOM(vs_constants, r300_constant_buffer);
 269     if (!r300->screen->caps.has_tcl) {
 270         R300_ALLOC_ATOM(vertex_stream_state, r300_vertex_stream_state);
 271     }
 272
 273     /* Some non-CSO atoms don't use the state pointer. */
 274     r300->fb_state_pipelined.allow_null_state = TRUE;
 275     r300->fs_rc_constant_state.allow_null_state = TRUE;
 276     r300->pvs_flush.allow_null_state = TRUE;
 277     r300->query_start.allow_null_state = TRUE;
 278     r300->texture_cache_inval.allow_null_state = TRUE;
 279
 280     /* Some states must be marked as dirty here to properly set up
 281      * hardware in the first command stream. */
 282     r300_mark_atom_dirty(r300, &r300->invariant_state);
 283     r300_mark_atom_dirty(r300, &r300->pvs_flush);
 284     r300_mark_atom_dirty(r300, &r300->vap_invariant_state);
 285     r300_mark_atom_dirty(r300, &r300->texture_cache_inval);
 286     r300_mark_atom_dirty(r300, &r300->textures_state);
 287
 288     return TRUE;
 289 }
 290
 291 /* Not every state tracker calls every driver function before the first draw
 292  * call and we must initialize the command buffers somehow. */
 293 static void r300_init_states(struct pipe_context *pipe)
 294 {
 295     struct r300_context *r300 = r300_context(pipe);
 296     struct pipe_blend_color bc = {{0}};
 297     struct pipe_clip_state cs = {{{0}}};
 298     struct pipe_scissor_state ss = {0};
 299     struct r300_clip_state *clip =
 300             (struct r300_clip_state*)r300->clip_state.state;
 301     struct r300_gpu_flush *gpuflush =
 302             (struct r300_gpu_flush*)r300->gpu_flush.state;
 303     struct r300_vap_invariant_state *vap_invariant =
 304             (struct r300_vap_invariant_state*)r300->vap_invariant_state.state;
 305     struct r300_invariant_state *invariant =
 306             (struct r300_invariant_state*)r300->invariant_state.state;
 307
 308     CB_LOCALS;
 309
 310     pipe->set_blend_color(pipe, &bc);
 311     pipe->set_scissor_state(pipe, &ss);
 312
 313     /* Initialize the clip state. */
 314     if (r300->screen->caps.has_tcl) {
 315         pipe->set_clip_state(pipe, &cs);
 316     } else {
 317         BEGIN_CB(clip->cb, 2);
 318         OUT_CB_REG(R300_VAP_CLIP_CNTL, R300_CLIP_DISABLE);
 319         END_CB;
 320     }
 321
 322     /* Initialize the GPU flush. */
 323     {
 324         BEGIN_CB(gpuflush->cb_flush_clean, 6);
 325
 326         /* Flush and free renderbuffer caches. */
 327         OUT_CB_REG(R300_RB3D_DSTCACHE_CTLSTAT,
 328             R300_RB3D_DSTCACHE_CTLSTAT_DC_FREE_FREE_3D_TAGS |
 329             R300_RB3D_DSTCACHE_CTLSTAT_DC_FLUSH_FLUSH_DIRTY_3D);
 330         OUT_CB_REG(R300_ZB_ZCACHE_CTLSTAT,
 331             R300_ZB_ZCACHE_CTLSTAT_ZC_FLUSH_FLUSH_AND_FREE |
 332             R300_ZB_ZCACHE_CTLSTAT_ZC_FREE_FREE);
 333
 334         /* Wait until the GPU is idle.
 335          * This fixes random pixels sometimes appearing probably caused
 336          * by incomplete rendering. */
 337         OUT_CB_REG(RADEON_WAIT_UNTIL, RADEON_WAIT_3D_IDLECLEAN);
 338         END_CB;
 339     }
 340
 341     /* Initialize the VAP invariant state. */
 342     {
 343         BEGIN_CB(vap_invariant->cb, 9);
 344         OUT_CB_REG(VAP_PVS_VTX_TIMEOUT_REG, 0xffff);
 345         OUT_CB_REG_SEQ(R300_VAP_GB_VERT_CLIP_ADJ, 4);
 346         OUT_CB_32F(1.0);
 347         OUT_CB_32F(1.0);
 348         OUT_CB_32F(1.0);
 349         OUT_CB_32F(1.0);
 350         OUT_CB_REG(R300_VAP_PSC_SGN_NORM_CNTL, R300_SGN_NORM_NO_ZERO);
 351         END_CB;
 352     }
 353
 354     /* Initialize the invariant state. */
 355     {
 356         BEGIN_CB(invariant->cb, r300->invariant_state.size);
 357         OUT_CB_REG(R300_GB_SELECT, 0);
 358         OUT_CB_REG(R300_FG_FOG_BLEND, 0);
 359         OUT_CB_REG(R300_GA_ROUND_MODE, 1);
 360         OUT_CB_REG(R300_GA_OFFSET, 0);
 361         OUT_CB_REG(R300_SU_TEX_WRAP, 0);
 362         OUT_CB_REG(R300_SU_DEPTH_SCALE, 0x4B7FFFFF);
 363         OUT_CB_REG(R300_SU_DEPTH_OFFSET, 0);
 364         OUT_CB_REG(R300_SC_EDGERULE, 0x2DA49525);
 365
 366         if (r300->screen->caps.is_rv350) {
 367             OUT_CB_REG(R500_RB3D_DISCARD_SRC_PIXEL_LTE_THRESHOLD, 0x01010101);
 368             OUT_CB_REG(R500_RB3D_DISCARD_SRC_PIXEL_GTE_THRESHOLD, 0xFEFEFEFE);
 369         }
 370         END_CB;
 371     }
 372
 373     /* Initialize the hyperz state. */
 374     {
 375         struct r300_hyperz_state *hyperz =
 376             (struct r300_hyperz_state*)r300->hyperz_state.state;
 377         BEGIN_CB(&hyperz->cb_flush_begin, r300->hyperz_state.size);
 378         OUT_CB_REG(R300_ZB_ZCACHE_CTLSTAT,
 379                    R300_ZB_ZCACHE_CTLSTAT_ZC_FLUSH_FLUSH_AND_FREE);
 380         OUT_CB_REG(R300_ZB_BW_CNTL, 0);
 381         OUT_CB_REG(R300_ZB_DEPTHCLEARVALUE, 0);
 382         OUT_CB_REG(R300_SC_HYPERZ, R300_SC_HYPERZ_ADJ_2);
 383
 384         if (r300->screen->caps.is_r500 ||
 385             (r300->screen->caps.is_rv350 &&
 386              r300->rws->get_value(r300->rws, R300_VID_DRM_2_6_0))) {
 387             OUT_CB_REG(R300_GB_Z_PEQ_CONFIG, 0);
 388         }
 389         END_CB;
 390     }
 391 }
 392
 393 struct pipe_context* r300_create_context(struct pipe_screen* screen,
 394                                          void *priv)
 395 {
 396     struct r300_context* r300 = CALLOC_STRUCT(r300_context);
 397     struct r300_screen* r300screen = r300_screen(screen);
 398     struct r300_winsys_screen *rws = r300screen->rws;
 399
 400     if (!r300)
 401         return NULL;
 402
 403     r300_update_num_contexts(r300screen, 1);
 404
 405     r300->rws = rws;
 406     r300->screen = r300screen;
 407
 408     r300->context.winsys = (struct pipe_winsys*)rws;
 409     r300->context.screen = screen;
 410     r300->context.priv = priv;
 411
 412     r300->context.destroy = r300_destroy_context;
 413
 414     make_empty_list(&r300->query_list);
 415
 416     util_slab_create(&r300->pool_transfers,
 417                      sizeof(struct pipe_transfer), 64,
 418                      UTIL_SLAB_SINGLETHREADED);
 419
 420     r300->cs = rws->cs_create(rws);
 421     if (r300->cs == NULL)
 422         goto fail;
 423
 424     if (!r300screen->caps.has_tcl) {
 425         /* Create a Draw. This is used for SW TCL. */
 426         r300->draw = draw_create(&r300->context);
 427         if (r300->draw == NULL)
 428             goto fail;
 429         /* Enable our renderer. */
 430         draw_set_rasterize_stage(r300->draw, r300_draw_stage(r300));
 431         /* Disable converting points/lines to triangles. */
 432         draw_wide_line_threshold(r300->draw, 10000000.f);
 433         draw_wide_point_threshold(r300->draw, 10000000.f);
 434     }
 435
 436     if (!r300_setup_atoms(r300))
 437         goto fail;
 438
 439     r300_init_blit_functions(r300);
 440     r300_init_flush_functions(r300);
 441     r300_init_query_functions(r300);
 442     r300_init_state_functions(r300);
 443     r300_init_resource_functions(r300);
 444
 445     r300->blitter = util_blitter_create(&r300->context);
 446     if (r300->blitter == NULL)
 447         goto fail;
 448
 449     /* Render functions must be initialized after blitter. */
 450     r300_init_render_functions(r300);
 451
 452     rws->cs_set_flush(r300->cs, r300_flush_cb, r300);
 453
 454     /* setup hyper-z mm */
 455     if (r300->rws->get_value(r300->rws, R300_CAN_HYPERZ))
 456         if (!r300_hyperz_init_mm(r300))
 457             goto fail;
 458
 459     r300->upload_ib = u_upload_create(&r300->context,
 460                                       64 * 1024, 16,
 461                                       PIPE_BIND_INDEX_BUFFER);
 462
 463     if (r300->upload_ib == NULL)
 464         goto fail;
 465
 466     r300->upload_vb = u_upload_create(&r300->context,
 467                                       1024 * 1024, 16,
 468                                       PIPE_BIND_VERTEX_BUFFER);
 469     if (r300->upload_vb == NULL)
 470         goto fail;
 471
 472     r300->tran.translate_cache = translate_cache_create();
 473     if (r300->tran.translate_cache == NULL)
 474         goto fail;
 475
 476     r300_init_states(&r300->context);
 477
 478     /* The KIL opcode needs the first texture unit to be enabled
 479      * on r3xx-r4xx. In order to calm down the CS checker, we bind this
 480      * dummy texture there. */
 481     if (!r300->screen->caps.is_r500) {
 482         struct pipe_resource *tex;
 483         struct pipe_resource rtempl = {{0}};
 484         struct pipe_sampler_view vtempl = {{0}};
 485
 486         rtempl.target = PIPE_TEXTURE_2D;
 487         rtempl.format = PIPE_FORMAT_I8_UNORM;
 488         rtempl.bind = PIPE_BIND_SAMPLER_VIEW;
 489         rtempl.usage = PIPE_USAGE_IMMUTABLE;
 490         rtempl.width0 = 1;
 491         rtempl.height0 = 1;
 492         rtempl.depth0 = 1;
 493         tex = screen->resource_create(screen, &rtempl);
 494
 495         u_sampler_view_default_template(&vtempl, tex, tex->format);
 496
 497         r300->texkill_sampler = (struct r300_sampler_view*)
 498             r300->context.create_sampler_view(&r300->context, tex, &vtempl);
 499
 500         pipe_resource_reference(&tex, NULL);
 501     }
 502
 503     {
 504         struct pipe_resource vb = {};
 505         vb.target = PIPE_BUFFER;
 506         vb.format = PIPE_FORMAT_R8_UNORM;
 507         vb.bind = PIPE_BIND_VERTEX_BUFFER;
 508         vb.usage = PIPE_USAGE_IMMUTABLE;
 509         vb.width0 = sizeof(float) * 16;
 510         vb.height0 = 1;
 511         vb.depth0 = 1;
 512
 513         r300->dummy_vb = screen->resource_create(screen, &vb);
 514     }
 515
 516     {
 517         struct pipe_depth_stencil_alpha_state dsa = {};
 518         dsa.depth.writemask = 1;
 519
 520         r300->dsa_decompress_zmask =
 521             r300->context.create_depth_stencil_alpha_state(&r300->context,
 522                                                            &dsa);
 523     }
 524
 525     return &r300->context;
 526
 527  fail:
 528     r300_destroy_context(&r300->context);
 529     return NULL;
 530 }
 531
 532 void r300_finish(struct r300_context *r300)
 533 {
 534     struct pipe_framebuffer_state *fb;
 535     unsigned i;
 536
 537     /* This is a preliminary implementation of glFinish.
 538      *
 539      * The ideal implementation should use something like EmitIrqLocked and
 540      * WaitIrq, or better, real fences.
 541      */
 542     if (r300->fb_state.state) {
 543         fb = r300->fb_state.state;
 544
 545         for (i = 0; i < fb->nr_cbufs; i++) {
 546             if (fb->cbufs[i]->texture) {
 547                 r300->rws->buffer_wait(r300->rws,
 548                     r300_texture(fb->cbufs[i]->texture)->buffer);
 549                 return;
 550             }
 551         }
 552         if (fb->zsbuf && fb->zsbuf->texture) {
 553             r300->rws->buffer_wait(r300->rws,
 554                 r300_texture(fb->zsbuf->texture)->buffer);
 555         }
 556     }
 557 }