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_slab_set_thread_safety(&r300screen->pool_buffers,
  48                                         UTIL_SLAB_MULTITHREADED);
  49     } else {
  50         p_atomic_dec(&r300screen->num_contexts);
  51
  52         if (r300screen->num_contexts <= 1)
  53             util_slab_set_thread_safety(&r300screen->pool_buffers,
  54                                         UTIL_SLAB_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 dummy VBO. */
  83     pipe_resource_reference(&r300->dummy_vb, NULL);
  84
  85     /* The SWTCL VBO. */
  86     pipe_resource_reference(&r300->vbo, NULL);
  87
  88     /* Vertex buffers. */
  89     for (i = 0; i < r300->vertex_buffer_count; i++) {
  90         pipe_resource_reference(&r300->vertex_buffer[i].buffer, NULL);
  91     }
  92
  93     /* If there are any queries pending or not destroyed, remove them now. */
  94     foreach_s(query, temp, &r300->query_list) {
  95         remove_from_list(query);
  96         FREE(query);
  97     }
  98 }
  99
 100 static void r300_destroy_context(struct pipe_context* context)
 101 {
 102     struct r300_context* r300 = r300_context(context);
 103     struct r300_atom *atom;
 104
 105     if (r300->blitter)
 106         util_blitter_destroy(r300->blitter);
 107     if (r300->draw)
 108         draw_destroy(r300->draw);
 109
 110     /* Print stats, if enabled. */
 111     if (SCREEN_DBG_ON(r300->screen, DBG_STATS)) {
 112         fprintf(stderr, "r300: Stats for context %p:\n", r300);
 113         fprintf(stderr, "    : Flushes: %" PRIu64 "\n", r300->flush_counter);
 114         foreach(atom, &r300->atom_list) {
 115             fprintf(stderr, "    : %s: %" PRIu64 " emits\n",
 116                 atom->name, atom->counter);
 117         }
 118     }
 119
 120     if (r300->upload_vb)
 121         u_upload_destroy(r300->upload_vb);
 122     if (r300->upload_ib)
 123         u_upload_destroy(r300->upload_ib);
 124
 125     if (r300->tran.translate_cache)
 126         translate_cache_destroy(r300->tran.translate_cache);
 127
 128     /* XXX: This function assumes r300->query_list was initialized */
 129     r300_release_referenced_objects(r300);
 130
 131     if (r300->zmask_mm)
 132         r300_hyperz_destroy_mm(r300);
 133
 134     if (r300->cs)
 135         r300->rws->cs_destroy(r300->cs);
 136
 137     /* XXX: No way to tell if this was initialized or not? */
 138     util_slab_destroy(&r300->pool_transfers);
 139
 140     r300_update_num_contexts(r300->screen, -1);
 141
 142     /* Free the structs allocated in r300_setup_atoms() */
 143     if (r300->aa_state.state) {
 144         FREE(r300->aa_state.state);
 145         FREE(r300->blend_color_state.state);
 146         FREE(r300->clip_state.state);
 147         FREE(r300->fb_state.state);
 148         FREE(r300->gpu_flush.state);
 149         FREE(r300->hyperz_state.state);
 150         FREE(r300->invariant_state.state);
 151         FREE(r300->rs_block_state.state);
 152         FREE(r300->scissor_state.state);
 153         FREE(r300->textures_state.state);
 154         FREE(r300->vap_invariant_state.state);
 155         FREE(r300->viewport_state.state);
 156         FREE(r300->ztop_state.state);
 157         FREE(r300->fs_constants.state);
 158         FREE(r300->vs_constants.state);
 159         if (!r300->screen->caps.has_tcl) {
 160             FREE(r300->vertex_stream_state.state);
 161         }
 162     }
 163     FREE(r300);
 164 }
 165
 166 void r300_flush_cb(void *data)
 167 {
 168     struct r300_context* const cs_context_copy = data;
 169
 170     cs_context_copy->context.flush(&cs_context_copy->context, 0, NULL);
 171 }
 172
 173 #define R300_INIT_ATOM(atomname, atomsize) \
 174  do { \
 175     r300->atomname.name = #atomname; \
 176     r300->atomname.state = NULL; \
 177     r300->atomname.size = atomsize; \
 178     r300->atomname.emit = r300_emit_##atomname; \
 179     r300->atomname.dirty = FALSE; \
 180     insert_at_tail(&r300->atom_list, &r300->atomname); \
 181  } while (0)
 182
 183 #define R300_ALLOC_ATOM(atomname, statetype) \
 184 do { \
 185     r300->atomname.state = CALLOC_STRUCT(statetype); \
 186     if (r300->atomname.state == NULL) \
 187         return FALSE; \
 188 } while (0)
 189
 190 static boolean r300_setup_atoms(struct r300_context* r300)
 191 {
 192     boolean is_rv350 = r300->screen->caps.is_rv350;
 193     boolean is_r500 = r300->screen->caps.is_r500;
 194     boolean has_tcl = r300->screen->caps.has_tcl;
 195     boolean drm_2_3_0 = r300->rws->get_value(r300->rws, R300_VID_DRM_2_3_0);
 196     boolean drm_2_6_0 = r300->rws->get_value(r300->rws, R300_VID_DRM_2_6_0);
 197     boolean can_hyperz = r300->rws->get_value(r300->rws, R300_CAN_HYPERZ);
 198     boolean has_hiz_ram = r300->screen->caps.hiz_ram > 0;
 199
 200     /* Create the actual atom list.
 201      *
 202      * Each atom is examined and emitted in the order it appears here, which
 203      * can affect performance and conformance if not handled with care.
 204      *
 205      * Some atoms never change size, others change every emit - those have
 206      * the size of 0 here.
 207      *
 208      * NOTE: The framebuffer state is split into these atoms:
 209      * - gpu_flush          (unpipelined regs)
 210      * - aa_state           (unpipelined regs)
 211      * - fb_state           (unpipelined regs)
 212      * - hyperz_state       (unpipelined regs followed by pipelined ones)
 213      * - fb_state_pipelined (pipelined regs)
 214      * The motivation behind this is to be able to emit a strict
 215      * subset of the regs, and to have reasonable register ordering. */
 216     make_empty_list(&r300->atom_list);
 217     /* SC, GB (unpipelined), RB3D (unpipelined), ZB (unpipelined). */
 218     R300_INIT_ATOM(gpu_flush, 9);
 219     R300_INIT_ATOM(aa_state, 4);
 220     R300_INIT_ATOM(fb_state, 0);
 221     R300_INIT_ATOM(hyperz_state, is_r500 || (is_rv350 && drm_2_6_0) ? 10 : 8);
 222     /* ZB (unpipelined), SC. */
 223     R300_INIT_ATOM(ztop_state, 2);
 224     /* ZB, FG. */
 225     R300_INIT_ATOM(dsa_state, is_r500 ? 8 : 6);
 226     /* RB3D. */
 227     R300_INIT_ATOM(blend_state, 8);
 228     R300_INIT_ATOM(blend_color_state, is_r500 ? 3 : 2);
 229     /* SC. */
 230     R300_INIT_ATOM(scissor_state, 3);
 231     /* GB, FG, GA, SU, SC, RB3D. */
 232     R300_INIT_ATOM(invariant_state, 16 + (is_rv350 ? 4 : 0));
 233     /* VAP. */
 234     R300_INIT_ATOM(viewport_state, 9);
 235     R300_INIT_ATOM(pvs_flush, 2);
 236     R300_INIT_ATOM(vap_invariant_state, 9);
 237     R300_INIT_ATOM(vertex_stream_state, 0);
 238     R300_INIT_ATOM(vs_state, 0);
 239     R300_INIT_ATOM(vs_constants, 0);
 240     R300_INIT_ATOM(clip_state, has_tcl ? 5 + (6 * 4) : 2);
 241     /* VAP, RS, GA, GB, SU, SC. */
 242     R300_INIT_ATOM(rs_block_state, 0);
 243     R300_INIT_ATOM(rs_state, 0);
 244     /* SC, US. */
 245     R300_INIT_ATOM(fb_state_pipelined, 5 + (drm_2_3_0 ? 3 : 0));
 246     /* US. */
 247     R300_INIT_ATOM(fs, 0);
 248     R300_INIT_ATOM(fs_rc_constant_state, 0);
 249     R300_INIT_ATOM(fs_constants, 0);
 250     /* TX. */
 251     R300_INIT_ATOM(texture_cache_inval, 2);
 252     R300_INIT_ATOM(textures_state, 0);
 253     if (can_hyperz) {
 254         /* HiZ Clear */
 255         if (has_hiz_ram)
 256             R300_INIT_ATOM(hiz_clear, 0);
 257         /* zmask clear */
 258         R300_INIT_ATOM(zmask_clear, 0);
 259     }
 260     /* ZB (unpipelined), SU. */
 261     R300_INIT_ATOM(query_start, 4);
 262
 263     /* Replace emission functions for r500. */
 264     if (is_r500) {
 265         r300->fs.emit = r500_emit_fs;
 266         r300->fs_rc_constant_state.emit = r500_emit_fs_rc_constant_state;
 267         r300->fs_constants.emit = r500_emit_fs_constants;
 268     }
 269
 270     /* Some non-CSO atoms need explicit space to store the state locally. */
 271     R300_ALLOC_ATOM(aa_state, r300_aa_state);
 272     R300_ALLOC_ATOM(blend_color_state, r300_blend_color_state);
 273     R300_ALLOC_ATOM(clip_state, r300_clip_state);
 274     R300_ALLOC_ATOM(hyperz_state, r300_hyperz_state);
 275     R300_ALLOC_ATOM(invariant_state, r300_invariant_state);
 276     R300_ALLOC_ATOM(textures_state, r300_textures_state);
 277     R300_ALLOC_ATOM(vap_invariant_state, r300_vap_invariant_state);
 278     R300_ALLOC_ATOM(viewport_state, r300_viewport_state);
 279     R300_ALLOC_ATOM(ztop_state, r300_ztop_state);
 280     R300_ALLOC_ATOM(fb_state, pipe_framebuffer_state);
 281     R300_ALLOC_ATOM(gpu_flush, pipe_framebuffer_state);
 282     R300_ALLOC_ATOM(scissor_state, pipe_scissor_state);
 283     R300_ALLOC_ATOM(rs_block_state, r300_rs_block);
 284     R300_ALLOC_ATOM(fs_constants, r300_constant_buffer);
 285     R300_ALLOC_ATOM(vs_constants, r300_constant_buffer);
 286     if (!r300->screen->caps.has_tcl) {
 287         R300_ALLOC_ATOM(vertex_stream_state, r300_vertex_stream_state);
 288     }
 289
 290     /* Some non-CSO atoms don't use the state pointer. */
 291     r300->fb_state_pipelined.allow_null_state = TRUE;
 292     r300->fs_rc_constant_state.allow_null_state = TRUE;
 293     r300->pvs_flush.allow_null_state = TRUE;
 294     r300->query_start.allow_null_state = TRUE;
 295     r300->texture_cache_inval.allow_null_state = TRUE;
 296
 297     /* Some states must be marked as dirty here to properly set up
 298      * hardware in the first command stream. */
 299     r300->invariant_state.dirty = TRUE;
 300     r300->pvs_flush.dirty = TRUE;
 301     r300->vap_invariant_state.dirty = TRUE;
 302     r300->texture_cache_inval.dirty = TRUE;
 303     r300->textures_state.dirty = TRUE;
 304
 305     return TRUE;
 306 }
 307
 308 /* Not every state tracker calls every driver function before the first draw
 309  * call and we must initialize the command buffers somehow. */
 310 static void r300_init_states(struct pipe_context *pipe)
 311 {
 312     struct r300_context *r300 = r300_context(pipe);
 313     struct pipe_blend_color bc = {{0}};
 314     struct pipe_clip_state cs = {{{0}}};
 315     struct pipe_scissor_state ss = {0};
 316     struct r300_clip_state *clip =
 317             (struct r300_clip_state*)r300->clip_state.state;
 318     struct r300_gpu_flush *gpuflush =
 319             (struct r300_gpu_flush*)r300->gpu_flush.state;
 320     struct r300_vap_invariant_state *vap_invariant =
 321             (struct r300_vap_invariant_state*)r300->vap_invariant_state.state;
 322     struct r300_invariant_state *invariant =
 323             (struct r300_invariant_state*)r300->invariant_state.state;
 324
 325     CB_LOCALS;
 326
 327     pipe->set_blend_color(pipe, &bc);
 328     pipe->set_scissor_state(pipe, &ss);
 329
 330     /* Initialize the clip state. */
 331     if (r300->screen->caps.has_tcl) {
 332         pipe->set_clip_state(pipe, &cs);
 333     } else {
 334         BEGIN_CB(clip->cb, 2);
 335         OUT_CB_REG(R300_VAP_CLIP_CNTL, R300_CLIP_DISABLE);
 336         END_CB;
 337     }
 338
 339     /* Initialize the GPU flush. */
 340     {
 341         BEGIN_CB(gpuflush->cb_flush_clean, 6);
 342
 343         /* Flush and free renderbuffer caches. */
 344         OUT_CB_REG(R300_RB3D_DSTCACHE_CTLSTAT,
 345             R300_RB3D_DSTCACHE_CTLSTAT_DC_FREE_FREE_3D_TAGS |
 346             R300_RB3D_DSTCACHE_CTLSTAT_DC_FLUSH_FLUSH_DIRTY_3D);
 347         OUT_CB_REG(R300_ZB_ZCACHE_CTLSTAT,
 348             R300_ZB_ZCACHE_CTLSTAT_ZC_FLUSH_FLUSH_AND_FREE |
 349             R300_ZB_ZCACHE_CTLSTAT_ZC_FREE_FREE);
 350
 351         /* Wait until the GPU is idle.
 352          * This fixes random pixels sometimes appearing probably caused
 353          * by incomplete rendering. */
 354         OUT_CB_REG(RADEON_WAIT_UNTIL, RADEON_WAIT_3D_IDLECLEAN);
 355         END_CB;
 356     }
 357
 358     /* Initialize the VAP invariant state. */
 359     {
 360         BEGIN_CB(vap_invariant->cb, 9);
 361         OUT_CB_REG(VAP_PVS_VTX_TIMEOUT_REG, 0xffff);
 362         OUT_CB_REG_SEQ(R300_VAP_GB_VERT_CLIP_ADJ, 4);
 363         OUT_CB_32F(1.0);
 364         OUT_CB_32F(1.0);
 365         OUT_CB_32F(1.0);
 366         OUT_CB_32F(1.0);
 367         OUT_CB_REG(R300_VAP_PSC_SGN_NORM_CNTL, R300_SGN_NORM_NO_ZERO);
 368         END_CB;
 369     }
 370
 371     /* Initialize the invariant state. */
 372     {
 373         BEGIN_CB(invariant->cb, r300->invariant_state.size);
 374         OUT_CB_REG(R300_GB_SELECT, 0);
 375         OUT_CB_REG(R300_FG_FOG_BLEND, 0);
 376         OUT_CB_REG(R300_GA_ROUND_MODE, 1);
 377         OUT_CB_REG(R300_GA_OFFSET, 0);
 378         OUT_CB_REG(R300_SU_TEX_WRAP, 0);
 379         OUT_CB_REG(R300_SU_DEPTH_SCALE, 0x4B7FFFFF);
 380         OUT_CB_REG(R300_SU_DEPTH_OFFSET, 0);
 381         OUT_CB_REG(R300_SC_EDGERULE, 0x2DA49525);
 382
 383         if (r300->screen->caps.is_rv350) {
 384             OUT_CB_REG(R500_RB3D_DISCARD_SRC_PIXEL_LTE_THRESHOLD, 0x01010101);
 385             OUT_CB_REG(R500_RB3D_DISCARD_SRC_PIXEL_GTE_THRESHOLD, 0xFEFEFEFE);
 386         }
 387         END_CB;
 388     }
 389
 390     /* Initialize the hyperz state. */
 391     {
 392         struct r300_hyperz_state *hyperz =
 393             (struct r300_hyperz_state*)r300->hyperz_state.state;
 394         BEGIN_CB(&hyperz->cb_flush_begin, r300->hyperz_state.size);
 395         OUT_CB_REG(R300_ZB_ZCACHE_CTLSTAT,
 396                    R300_ZB_ZCACHE_CTLSTAT_ZC_FLUSH_FLUSH_AND_FREE);
 397         OUT_CB_REG(R300_ZB_BW_CNTL, 0);
 398         OUT_CB_REG(R300_ZB_DEPTHCLEARVALUE, 0);
 399         OUT_CB_REG(R300_SC_HYPERZ, R300_SC_HYPERZ_ADJ_2);
 400
 401         if (r300->screen->caps.is_r500 ||
 402             (r300->screen->caps.is_rv350 &&
 403              r300->rws->get_value(r300->rws, R300_VID_DRM_2_6_0))) {
 404             OUT_CB_REG(R300_GB_Z_PEQ_CONFIG, 0);
 405         }
 406         END_CB;
 407     }
 408 }
 409
 410 struct pipe_context* r300_create_context(struct pipe_screen* screen,
 411                                          void *priv)
 412 {
 413     struct r300_context* r300 = CALLOC_STRUCT(r300_context);
 414     struct r300_screen* r300screen = r300_screen(screen);
 415     struct r300_winsys_screen *rws = r300screen->rws;
 416
 417     if (!r300)
 418         return NULL;
 419
 420     r300_update_num_contexts(r300screen, 1);
 421
 422     r300->rws = rws;
 423     r300->screen = r300screen;
 424
 425     r300->context.winsys = (struct pipe_winsys*)rws;
 426     r300->context.screen = screen;
 427     r300->context.priv = priv;
 428
 429     r300->context.destroy = r300_destroy_context;
 430
 431     make_empty_list(&r300->query_list);
 432
 433     util_slab_create(&r300->pool_transfers,
 434                      sizeof(struct pipe_transfer), 64,
 435                      UTIL_SLAB_SINGLETHREADED);
 436
 437     r300->cs = rws->cs_create(rws);
 438     if (r300->cs == NULL)
 439         goto fail;
 440
 441     if (!r300screen->caps.has_tcl) {
 442         /* Create a Draw. This is used for SW TCL. */
 443         r300->draw = draw_create(&r300->context);
 444         if (r300->draw == NULL)
 445             goto fail;
 446         /* Enable our renderer. */
 447         draw_set_rasterize_stage(r300->draw, r300_draw_stage(r300));
 448         /* Disable converting points/lines to triangles. */
 449         draw_wide_line_threshold(r300->draw, 10000000.f);
 450         draw_wide_point_threshold(r300->draw, 10000000.f);
 451     }
 452
 453     if (!r300_setup_atoms(r300))
 454         goto fail;
 455
 456     r300_init_blit_functions(r300);
 457     r300_init_flush_functions(r300);
 458     r300_init_query_functions(r300);
 459     r300_init_state_functions(r300);
 460     r300_init_resource_functions(r300);
 461
 462     r300->blitter = util_blitter_create(&r300->context);
 463     if (r300->blitter == NULL)
 464         goto fail;
 465
 466     /* Render functions must be initialized after blitter. */
 467     r300_init_render_functions(r300);
 468
 469     rws->cs_set_flush(r300->cs, r300_flush_cb, r300);
 470
 471     /* setup hyper-z mm */
 472     if (r300->rws->get_value(r300->rws, R300_CAN_HYPERZ))
 473         if (!r300_hyperz_init_mm(r300))
 474             goto fail;
 475
 476     r300->upload_ib = u_upload_create(&r300->context,
 477                                       32 * 1024, 16,
 478                                       PIPE_BIND_INDEX_BUFFER);
 479
 480     if (r300->upload_ib == NULL)
 481         goto fail;
 482
 483     r300->upload_vb = u_upload_create(&r300->context,
 484                                       128 * 1024, 16,
 485                                       PIPE_BIND_VERTEX_BUFFER);
 486     if (r300->upload_vb == NULL)
 487         goto fail;
 488
 489     r300->tran.translate_cache = translate_cache_create();
 490     if (r300->tran.translate_cache == NULL)
 491         goto fail;
 492
 493     r300_init_states(&r300->context);
 494
 495     /* The KIL opcode needs the first texture unit to be enabled
 496      * on r3xx-r4xx. In order to calm down the CS checker, we bind this
 497      * dummy texture there. */
 498     if (!r300->screen->caps.is_r500) {
 499         struct pipe_resource *tex;
 500         struct pipe_resource rtempl = {{0}};
 501         struct pipe_sampler_view vtempl = {{0}};
 502
 503         rtempl.target = PIPE_TEXTURE_2D;
 504         rtempl.format = PIPE_FORMAT_I8_UNORM;
 505         rtempl.bind = PIPE_BIND_SAMPLER_VIEW;
 506         rtempl.usage = PIPE_USAGE_IMMUTABLE;
 507         rtempl.width0 = 1;
 508         rtempl.height0 = 1;
 509         rtempl.depth0 = 1;
 510         tex = screen->resource_create(screen, &rtempl);
 511
 512         u_sampler_view_default_template(&vtempl, tex, tex->format);
 513
 514         r300->texkill_sampler = (struct r300_sampler_view*)
 515             r300->context.create_sampler_view(&r300->context, tex, &vtempl);
 516
 517         pipe_resource_reference(&tex, NULL);
 518     }
 519
 520     {
 521         struct pipe_resource vb = {};
 522         vb.target = PIPE_BUFFER;
 523         vb.format = PIPE_FORMAT_R8_UNORM;
 524         vb.bind = PIPE_BIND_VERTEX_BUFFER;
 525         vb.usage = PIPE_USAGE_IMMUTABLE;
 526         vb.width0 = sizeof(float) * 16;
 527         vb.height0 = 1;
 528         vb.depth0 = 1;
 529
 530         r300->dummy_vb = screen->resource_create(screen, &vb);
 531     }
 532
 533     return &r300->context;
 534
 535  fail:
 536     r300_destroy_context(&r300->context);
 537     return NULL;
 538 }
 539
 540 void r300_finish(struct r300_context *r300)
 541 {
 542     struct pipe_framebuffer_state *fb;
 543     unsigned i;
 544
 545     /* This is a preliminary implementation of glFinish.
 546      *
 547      * The ideal implementation should use something like EmitIrqLocked and
 548      * WaitIrq, or better, real fences.
 549      */
 550     if (r300->fb_state.state) {
 551         fb = r300->fb_state.state;
 552
 553         for (i = 0; i < fb->nr_cbufs; i++) {
 554             if (fb->cbufs[i]->texture) {
 555                 r300->rws->buffer_wait(r300->rws,
 556                     r300_texture(fb->cbufs[i]->texture)->buffer);
 557                 return;
 558             }
 559         }
 560         if (fb->zsbuf && fb->zsbuf->texture) {
 561             r300->rws->buffer_wait(r300->rws,
 562                 r300_texture(fb->zsbuf->texture)->buffer);
 563         }
 564     }
 565 }