src/gallium/drivers/nouveau/nvc0/nvc0_context.c

   1 /*
   2  * Copyright 2010 Christoph Bumiller
   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  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  */
  22
  23 #include "pipe/p_defines.h"
  24 #include "util/u_framebuffer.h"
  25 #include "util/u_upload_mgr.h"
  26
  27 #include "nvc0/nvc0_context.h"
  28 #include "nvc0/nvc0_screen.h"
  29 #include "nvc0/nvc0_resource.h"
  30
  31 static void
  32 nvc0_flush(struct pipe_context *pipe,
  33            struct pipe_fence_handle **fence,
  34            unsigned flags)
  35 {
  36    struct nvc0_context *nvc0 = nvc0_context(pipe);
  37    struct nouveau_screen *screen = &nvc0->screen->base;
  38
  39    if (fence)
  40       nouveau_fence_ref(screen->fence.current, (struct nouveau_fence **)fence);
  41
  42    PUSH_KICK(nvc0->base.pushbuf); /* fencing handled in kick_notify */
  43
  44    nouveau_context_update_frame_stats(&nvc0->base);
  45 }
  46
  47 static void
  48 nvc0_texture_barrier(struct pipe_context *pipe, unsigned flags)
  49 {
  50    struct nouveau_pushbuf *push = nvc0_context(pipe)->base.pushbuf;
  51
  52    IMMED_NVC0(push, NVC0_3D(SERIALIZE), 0);
  53    IMMED_NVC0(push, NVC0_3D(TEX_CACHE_CTL), 0);
  54 }
  55
  56 static void
  57 nvc0_memory_barrier(struct pipe_context *pipe, unsigned flags)
  58 {
  59    struct nvc0_context *nvc0 = nvc0_context(pipe);
  60    struct nouveau_pushbuf *push = nvc0->base.pushbuf;
  61    int i, s;
  62
  63    if (flags & PIPE_BARRIER_MAPPED_BUFFER) {
  64       for (i = 0; i < nvc0->num_vtxbufs; ++i) {
  65          if (!nvc0->vtxbuf[i].buffer.resource && !nvc0->vtxbuf[i].is_user_buffer)
  66             continue;
  67          if (nvc0->vtxbuf[i].buffer.resource->flags & PIPE_RESOURCE_FLAG_MAP_PERSISTENT)
  68             nvc0->base.vbo_dirty = true;
  69       }
  70
  71       for (s = 0; s < 5 && !nvc0->cb_dirty; ++s) {
  72          uint32_t valid = nvc0->constbuf_valid[s];
  73
  74          while (valid && !nvc0->cb_dirty) {
  75             const unsigned i = ffs(valid) - 1;
  76             struct pipe_resource *res;
  77
  78             valid &= ~(1 << i);
  79             if (nvc0->constbuf[s][i].user)
  80                continue;
  81
  82             res = nvc0->constbuf[s][i].u.buf;
  83             if (!res)
  84                continue;
  85
  86             if (res->flags & PIPE_RESOURCE_FLAG_MAP_PERSISTENT)
  87                nvc0->cb_dirty = true;
  88          }
  89       }
  90    } else {
  91       /* Pretty much any writing by shaders needs a serialize after
  92        * it. Especially when moving between 3d and compute pipelines, but even
  93        * without that.
  94        */
  95       IMMED_NVC0(push, NVC0_3D(SERIALIZE), 0);
  96    }
  97
  98    /* If we're going to texture from a buffer/image written by a shader, we
  99     * must flush the texture cache.
 100     */
 101    if (flags & PIPE_BARRIER_TEXTURE)
 102       IMMED_NVC0(push, NVC0_3D(TEX_CACHE_CTL), 0);
 103
 104    if (flags & PIPE_BARRIER_CONSTANT_BUFFER)
 105       nvc0->cb_dirty = true;
 106    if (flags & (PIPE_BARRIER_VERTEX_BUFFER | PIPE_BARRIER_INDEX_BUFFER))
 107       nvc0->base.vbo_dirty = true;
 108 }
 109
 110 static void
 111 nvc0_emit_string_marker(struct pipe_context *pipe, const char *str, int len)
 112 {
 113    struct nouveau_pushbuf *push = nvc0_context(pipe)->base.pushbuf;
 114    int string_words = len / 4;
 115    int data_words;
 116
 117    if (len <= 0)
 118       return;
 119    string_words = MIN2(string_words, NV04_PFIFO_MAX_PACKET_LEN);
 120    if (string_words == NV04_PFIFO_MAX_PACKET_LEN)
 121       data_words = string_words;
 122    else
 123       data_words = string_words + !!(len & 3);
 124    BEGIN_NIC0(push, SUBC_3D(NV04_GRAPH_NOP), data_words);
 125    if (string_words)
 126       PUSH_DATAp(push, str, string_words);
 127    if (string_words != data_words) {
 128       int data = 0;
 129       memcpy(&data, &str[string_words * 4], len & 3);
 130       PUSH_DATA (push, data);
 131    }
 132 }
 133
 134 static void
 135 nvc0_context_unreference_resources(struct nvc0_context *nvc0)
 136 {
 137    unsigned s, i;
 138
 139    nouveau_bufctx_del(&nvc0->bufctx_3d);
 140    nouveau_bufctx_del(&nvc0->bufctx);
 141    nouveau_bufctx_del(&nvc0->bufctx_cp);
 142
 143    util_unreference_framebuffer_state(&nvc0->framebuffer);
 144
 145    for (i = 0; i < nvc0->num_vtxbufs; ++i)
 146       pipe_vertex_buffer_unreference(&nvc0->vtxbuf[i]);
 147
 148    for (s = 0; s < 6; ++s) {
 149       for (i = 0; i < nvc0->num_textures[s]; ++i)
 150          pipe_sampler_view_reference(&nvc0->textures[s][i], NULL);
 151
 152       for (i = 0; i < NVC0_MAX_PIPE_CONSTBUFS; ++i)
 153          if (!nvc0->constbuf[s][i].user)
 154             pipe_resource_reference(&nvc0->constbuf[s][i].u.buf, NULL);
 155
 156       for (i = 0; i < NVC0_MAX_BUFFERS; ++i)
 157          pipe_resource_reference(&nvc0->buffers[s][i].buffer, NULL);
 158
 159       for (i = 0; i < NVC0_MAX_IMAGES; ++i) {
 160          pipe_resource_reference(&nvc0->images[s][i].resource, NULL);
 161          if (nvc0->screen->base.class_3d >= GM107_3D_CLASS)
 162             pipe_sampler_view_reference(&nvc0->images_tic[s][i], NULL);
 163       }
 164    }
 165
 166    for (s = 0; s < 2; ++s) {
 167       for (i = 0; i < NVC0_MAX_SURFACE_SLOTS; ++i)
 168          pipe_surface_reference(&nvc0->surfaces[s][i], NULL);
 169    }
 170
 171    for (i = 0; i < nvc0->num_tfbbufs; ++i)
 172       pipe_so_target_reference(&nvc0->tfbbuf[i], NULL);
 173
 174    for (i = 0; i < nvc0->global_residents.size / sizeof(struct pipe_resource *);
 175         ++i) {
 176       struct pipe_resource **res = util_dynarray_element(
 177          &nvc0->global_residents, struct pipe_resource *, i);
 178       pipe_resource_reference(res, NULL);
 179    }
 180    util_dynarray_fini(&nvc0->global_residents);
 181
 182    if (nvc0->tcp_empty)
 183       nvc0->base.pipe.delete_tcs_state(&nvc0->base.pipe, nvc0->tcp_empty);
 184 }
 185
 186 static void
 187 nvc0_destroy(struct pipe_context *pipe)
 188 {
 189    struct nvc0_context *nvc0 = nvc0_context(pipe);
 190
 191    if (nvc0->screen->cur_ctx == nvc0) {
 192       nvc0->screen->cur_ctx = NULL;
 193       nvc0->screen->save_state = nvc0->state;
 194       nvc0->screen->save_state.tfb = NULL;
 195    }
 196
 197    if (nvc0->base.pipe.stream_uploader)
 198       u_upload_destroy(nvc0->base.pipe.stream_uploader);
 199
 200    /* Unset bufctx, we don't want to revalidate any resources after the flush.
 201     * Other contexts will always set their bufctx again on action calls.
 202     */
 203    nouveau_pushbuf_bufctx(nvc0->base.pushbuf, NULL);
 204    nouveau_pushbuf_kick(nvc0->base.pushbuf, nvc0->base.pushbuf->channel);
 205
 206    nvc0_context_unreference_resources(nvc0);
 207    nvc0_blitctx_destroy(nvc0);
 208
 209    list_for_each_entry_safe(struct nvc0_resident, pos, &nvc0->tex_head, list) {
 210       list_del(&pos->list);
 211       free(pos);
 212    }
 213
 214    list_for_each_entry_safe(struct nvc0_resident, pos, &nvc0->img_head, list) {
 215       list_del(&pos->list);
 216       free(pos);
 217    }
 218
 219    nouveau_context_destroy(&nvc0->base);
 220 }
 221
 222 void
 223 nvc0_default_kick_notify(struct nouveau_pushbuf *push)
 224 {
 225    struct nvc0_screen *screen = push->user_priv;
 226
 227    if (screen) {
 228       nouveau_fence_next(&screen->base);
 229       nouveau_fence_update(&screen->base, true);
 230       if (screen->cur_ctx)
 231          screen->cur_ctx->state.flushed = true;
 232       NOUVEAU_DRV_STAT(&screen->base, pushbuf_count, 1);
 233    }
 234 }
 235
 236 static int
 237 nvc0_invalidate_resource_storage(struct nouveau_context *ctx,
 238                                  struct pipe_resource *res,
 239                                  int ref)
 240 {
 241    struct nvc0_context *nvc0 = nvc0_context(&ctx->pipe);
 242    unsigned s, i;
 243
 244    if (res->bind & PIPE_BIND_RENDER_TARGET) {
 245       for (i = 0; i < nvc0->framebuffer.nr_cbufs; ++i) {
 246          if (nvc0->framebuffer.cbufs[i] &&
 247              nvc0->framebuffer.cbufs[i]->texture == res) {
 248             nvc0->dirty_3d |= NVC0_NEW_3D_FRAMEBUFFER;
 249             nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_FB);
 250             if (!--ref)
 251                return ref;
 252          }
 253       }
 254    }
 255    if (res->bind & PIPE_BIND_DEPTH_STENCIL) {
 256       if (nvc0->framebuffer.zsbuf &&
 257           nvc0->framebuffer.zsbuf->texture == res) {
 258          nvc0->dirty_3d |= NVC0_NEW_3D_FRAMEBUFFER;
 259          nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_FB);
 260          if (!--ref)
 261             return ref;
 262       }
 263    }
 264
 265    if (res->target == PIPE_BUFFER) {
 266       for (i = 0; i < nvc0->num_vtxbufs; ++i) {
 267          if (nvc0->vtxbuf[i].buffer.resource == res) {
 268             nvc0->dirty_3d |= NVC0_NEW_3D_ARRAYS;
 269             nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_VTX);
 270             if (!--ref)
 271                return ref;
 272          }
 273       }
 274
 275       for (s = 0; s < 6; ++s) {
 276          for (i = 0; i < nvc0->num_textures[s]; ++i) {
 277             if (nvc0->textures[s][i] &&
 278                 nvc0->textures[s][i]->texture == res) {
 279                nvc0->textures_dirty[s] |= 1 << i;
 280                if (unlikely(s == 5)) {
 281                   nvc0->dirty_cp |= NVC0_NEW_CP_TEXTURES;
 282                   nouveau_bufctx_reset(nvc0->bufctx_cp, NVC0_BIND_CP_TEX(i));
 283                } else {
 284                   nvc0->dirty_3d |= NVC0_NEW_3D_TEXTURES;
 285                   nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_TEX(s, i));
 286                }
 287                if (!--ref)
 288                   return ref;
 289             }
 290          }
 291       }
 292
 293       for (s = 0; s < 6; ++s) {
 294          for (i = 0; i < NVC0_MAX_PIPE_CONSTBUFS; ++i) {
 295             if (!(nvc0->constbuf_valid[s] & (1 << i)))
 296                continue;
 297             if (!nvc0->constbuf[s][i].user &&
 298                 nvc0->constbuf[s][i].u.buf == res) {
 299                nvc0->constbuf_dirty[s] |= 1 << i;
 300                if (unlikely(s == 5)) {
 301                   nvc0->dirty_cp |= NVC0_NEW_CP_CONSTBUF;
 302                   nouveau_bufctx_reset(nvc0->bufctx_cp, NVC0_BIND_CP_CB(i));
 303                } else {
 304                   nvc0->dirty_3d |= NVC0_NEW_3D_CONSTBUF;
 305                   nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_CB(s, i));
 306                }
 307                if (!--ref)
 308                   return ref;
 309             }
 310          }
 311       }
 312
 313       for (s = 0; s < 6; ++s) {
 314          for (i = 0; i < NVC0_MAX_BUFFERS; ++i) {
 315             if (nvc0->buffers[s][i].buffer == res) {
 316                nvc0->buffers_dirty[s] |= 1 << i;
 317                if (unlikely(s == 5)) {
 318                   nvc0->dirty_cp |= NVC0_NEW_CP_BUFFERS;
 319                   nouveau_bufctx_reset(nvc0->bufctx_cp, NVC0_BIND_CP_BUF);
 320                } else {
 321                   nvc0->dirty_3d |= NVC0_NEW_3D_BUFFERS;
 322                   nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_BUF);
 323                }
 324                if (!--ref)
 325                   return ref;
 326             }
 327          }
 328       }
 329
 330       for (s = 0; s < 6; ++s) {
 331          for (i = 0; i < NVC0_MAX_IMAGES; ++i) {
 332             if (nvc0->images[s][i].resource == res) {
 333                nvc0->images_dirty[s] |= 1 << i;
 334                if (unlikely(s == 5)) {
 335                   nvc0->dirty_cp |= NVC0_NEW_CP_SURFACES;
 336                   nouveau_bufctx_reset(nvc0->bufctx_cp, NVC0_BIND_CP_SUF);
 337                } else {
 338                   nvc0->dirty_3d |= NVC0_NEW_3D_SURFACES;
 339                   nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_SUF);
 340                }
 341             }
 342             if (!--ref)
 343                return ref;
 344          }
 345       }
 346    }
 347
 348    return ref;
 349 }
 350
 351 static void
 352 nvc0_context_get_sample_position(struct pipe_context *, unsigned, unsigned,
 353                                  float *);
 354
 355 struct pipe_context *
 356 nvc0_create(struct pipe_screen *pscreen, void *priv, unsigned ctxflags)
 357 {
 358    struct nvc0_screen *screen = nvc0_screen(pscreen);
 359    struct nvc0_context *nvc0;
 360    struct pipe_context *pipe;
 361    int ret;
 362    uint32_t flags;
 363
 364    nvc0 = CALLOC_STRUCT(nvc0_context);
 365    if (!nvc0)
 366       return NULL;
 367    pipe = &nvc0->base.pipe;
 368
 369    if (!nvc0_blitctx_create(nvc0))
 370       goto out_err;
 371
 372    nvc0->base.pushbuf = screen->base.pushbuf;
 373    nvc0->base.client = screen->base.client;
 374
 375    ret = nouveau_bufctx_new(screen->base.client, 2, &nvc0->bufctx);
 376    if (!ret)
 377       ret = nouveau_bufctx_new(screen->base.client, NVC0_BIND_3D_COUNT,
 378                                &nvc0->bufctx_3d);
 379    if (!ret)
 380       ret = nouveau_bufctx_new(screen->base.client, NVC0_BIND_CP_COUNT,
 381                                &nvc0->bufctx_cp);
 382    if (ret)
 383       goto out_err;
 384
 385    nvc0->screen = screen;
 386    nvc0->base.screen = &screen->base;
 387
 388    pipe->screen = pscreen;
 389    pipe->priv = priv;
 390    pipe->stream_uploader = u_upload_create_default(pipe);
 391    if (!pipe->stream_uploader)
 392       goto out_err;
 393    pipe->const_uploader = pipe->stream_uploader;
 394
 395    pipe->destroy = nvc0_destroy;
 396
 397    pipe->draw_vbo = nvc0_draw_vbo;
 398    pipe->clear = nvc0_clear;
 399    pipe->launch_grid = (nvc0->screen->base.class_3d >= NVE4_3D_CLASS) ?
 400       nve4_launch_grid : nvc0_launch_grid;
 401
 402    pipe->flush = nvc0_flush;
 403    pipe->texture_barrier = nvc0_texture_barrier;
 404    pipe->memory_barrier = nvc0_memory_barrier;
 405    pipe->get_sample_position = nvc0_context_get_sample_position;
 406    pipe->emit_string_marker = nvc0_emit_string_marker;
 407
 408    nouveau_context_init(&nvc0->base);
 409    nvc0_init_query_functions(nvc0);
 410    nvc0_init_surface_functions(nvc0);
 411    nvc0_init_state_functions(nvc0);
 412    nvc0_init_transfer_functions(nvc0);
 413    nvc0_init_resource_functions(pipe);
 414    if (nvc0->screen->base.class_3d >= NVE4_3D_CLASS)
 415       nvc0_init_bindless_functions(pipe);
 416
 417    list_inithead(&nvc0->tex_head);
 418    list_inithead(&nvc0->img_head);
 419
 420    nvc0->base.invalidate_resource_storage = nvc0_invalidate_resource_storage;
 421
 422    pipe->create_video_codec = nvc0_create_decoder;
 423    pipe->create_video_buffer = nvc0_video_buffer_create;
 424
 425    /* shader builtin library is per-screen, but we need a context for m2mf */
 426    nvc0_program_library_upload(nvc0);
 427    nvc0_program_init_tcp_empty(nvc0);
 428    if (!nvc0->tcp_empty)
 429       goto out_err;
 430    /* set the empty tctl prog on next draw in case one is never set */
 431    nvc0->dirty_3d |= NVC0_NEW_3D_TCTLPROG;
 432
 433    /* Do not bind the COMPUTE driver constbuf at screen initialization because
 434     * CBs are aliased between 3D and COMPUTE, but make sure it will be bound if
 435     * a grid is launched later. */
 436    nvc0->dirty_cp |= NVC0_NEW_CP_DRIVERCONST;
 437
 438    /* now that there are no more opportunities for errors, set the current
 439     * context if there isn't already one.
 440     */
 441    if (!screen->cur_ctx) {
 442       nvc0->state = screen->save_state;
 443       screen->cur_ctx = nvc0;
 444       nouveau_pushbuf_bufctx(screen->base.pushbuf, nvc0->bufctx);
 445    }
 446    screen->base.pushbuf->kick_notify = nvc0_default_kick_notify;
 447
 448    /* add permanently resident buffers to bufctxts */
 449
 450    flags = NV_VRAM_DOMAIN(&screen->base) | NOUVEAU_BO_RD;
 451
 452    BCTX_REFN_bo(nvc0->bufctx_3d, 3D_TEXT, flags, screen->text);
 453    BCTX_REFN_bo(nvc0->bufctx_3d, 3D_SCREEN, flags, screen->uniform_bo);
 454    BCTX_REFN_bo(nvc0->bufctx_3d, 3D_SCREEN, flags, screen->txc);
 455    if (screen->compute) {
 456       BCTX_REFN_bo(nvc0->bufctx_cp, CP_TEXT, flags, screen->text);
 457       BCTX_REFN_bo(nvc0->bufctx_cp, CP_SCREEN, flags, screen->uniform_bo);
 458       BCTX_REFN_bo(nvc0->bufctx_cp, CP_SCREEN, flags, screen->txc);
 459    }
 460
 461    flags = NV_VRAM_DOMAIN(&screen->base) | NOUVEAU_BO_RDWR;
 462
 463    if (screen->poly_cache)
 464       BCTX_REFN_bo(nvc0->bufctx_3d, 3D_SCREEN, flags, screen->poly_cache);
 465    if (screen->compute)
 466       BCTX_REFN_bo(nvc0->bufctx_cp, CP_SCREEN, flags, screen->tls);
 467
 468    flags = NOUVEAU_BO_GART | NOUVEAU_BO_WR;
 469
 470    BCTX_REFN_bo(nvc0->bufctx_3d, 3D_SCREEN, flags, screen->fence.bo);
 471    BCTX_REFN_bo(nvc0->bufctx, FENCE, flags, screen->fence.bo);
 472    if (screen->compute)
 473       BCTX_REFN_bo(nvc0->bufctx_cp, CP_SCREEN, flags, screen->fence.bo);
 474
 475    nvc0->base.scratch.bo_size = 2 << 20;
 476
 477    memset(nvc0->tex_handles, ~0, sizeof(nvc0->tex_handles));
 478
 479    util_dynarray_init(&nvc0->global_residents, NULL);
 480
 481    return pipe;
 482
 483 out_err:
 484    if (nvc0) {
 485       if (pipe->stream_uploader)
 486          u_upload_destroy(pipe->stream_uploader);
 487       if (nvc0->bufctx_3d)
 488          nouveau_bufctx_del(&nvc0->bufctx_3d);
 489       if (nvc0->bufctx_cp)
 490          nouveau_bufctx_del(&nvc0->bufctx_cp);
 491       if (nvc0->bufctx)
 492          nouveau_bufctx_del(&nvc0->bufctx);
 493       FREE(nvc0->blit);
 494       FREE(nvc0);
 495    }
 496    return NULL;
 497 }
 498
 499 void
 500 nvc0_bufctx_fence(struct nvc0_context *nvc0, struct nouveau_bufctx *bufctx,
 501                   bool on_flush)
 502 {
 503    struct nouveau_list *list = on_flush ? &bufctx->current : &bufctx->pending;
 504    struct nouveau_list *it;
 505    NOUVEAU_DRV_STAT_IFD(unsigned count = 0);
 506
 507    for (it = list->next; it != list; it = it->next) {
 508       struct nouveau_bufref *ref = (struct nouveau_bufref *)it;
 509       struct nv04_resource *res = ref->priv;
 510       if (res)
 511          nvc0_resource_validate(res, (unsigned)ref->priv_data);
 512       NOUVEAU_DRV_STAT_IFD(count++);
 513    }
 514    NOUVEAU_DRV_STAT(&nvc0->screen->base, resource_validate_count, count);
 515 }
 516
 517 const void *
 518 nvc0_get_sample_locations(unsigned sample_count)
 519 {
 520    static const uint8_t ms1[1][2] = { { 0x8, 0x8 } };
 521    static const uint8_t ms2[2][2] = {
 522       { 0x4, 0x4 }, { 0xc, 0xc } }; /* surface coords (0,0), (1,0) */
 523    static const uint8_t ms4[4][2] = {
 524       { 0x6, 0x2 }, { 0xe, 0x6 },   /* (0,0), (1,0) */
 525       { 0x2, 0xa }, { 0xa, 0xe } }; /* (0,1), (1,1) */
 526    static const uint8_t ms8[8][2] = {
 527       { 0x1, 0x7 }, { 0x5, 0x3 },   /* (0,0), (1,0) */
 528       { 0x3, 0xd }, { 0x7, 0xb },   /* (0,1), (1,1) */
 529       { 0x9, 0x5 }, { 0xf, 0x1 },   /* (2,0), (3,0) */
 530       { 0xb, 0xf }, { 0xd, 0x9 } }; /* (2,1), (3,1) */
 531 #if 0
 532    /* NOTE: there are alternative modes for MS2 and MS8, currently not used */
 533    static const uint8_t ms8_alt[8][2] = {
 534       { 0x9, 0x5 }, { 0x7, 0xb },   /* (2,0), (1,1) */
 535       { 0xd, 0x9 }, { 0x5, 0x3 },   /* (3,1), (1,0) */
 536       { 0x3, 0xd }, { 0x1, 0x7 },   /* (0,1), (0,0) */
 537       { 0xb, 0xf }, { 0xf, 0x1 } }; /* (2,1), (3,0) */
 538 #endif
 539
 540    const uint8_t (*ptr)[2];
 541
 542    switch (sample_count) {
 543    case 0:
 544    case 1: ptr = ms1; break;
 545    case 2: ptr = ms2; break;
 546    case 4: ptr = ms4; break;
 547    case 8: ptr = ms8; break;
 548    default:
 549       assert(0);
 550       return NULL; /* bad sample count -> undefined locations */
 551    }
 552    return ptr;
 553 }
 554
 555 static void
 556 nvc0_context_get_sample_position(struct pipe_context *pipe,
 557                                  unsigned sample_count, unsigned sample_index,
 558                                  float *xy)
 559 {
 560    const uint8_t (*ptr)[2];
 561
 562    ptr = nvc0_get_sample_locations(sample_count);
 563    if (!ptr)
 564       return;
 565
 566    xy[0] = ptr[sample_index][0] * 0.0625f;
 567    xy[1] = ptr[sample_index][1] * 0.0625f;
 568 }