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
  26 #include "nvc0/nvc0_context.h"
  27 #include "nvc0/nvc0_screen.h"
  28 #include "nvc0/nvc0_resource.h"
  29
  30 static void
  31 nvc0_flush(struct pipe_context *pipe,
  32            struct pipe_fence_handle **fence,
  33            unsigned flags)
  34 {
  35    struct nvc0_context *nvc0 = nvc0_context(pipe);
  36    struct nouveau_screen *screen = &nvc0->screen->base;
  37
  38    if (fence)
  39       nouveau_fence_ref(screen->fence.current, (struct nouveau_fence **)fence);
  40
  41    PUSH_KICK(nvc0->base.pushbuf); /* fencing handled in kick_notify */
  42
  43    nouveau_context_update_frame_stats(&nvc0->base);
  44 }
  45
  46 static void
  47 nvc0_texture_barrier(struct pipe_context *pipe)
  48 {
  49    struct nouveau_pushbuf *push = nvc0_context(pipe)->base.pushbuf;
  50
  51    IMMED_NVC0(push, NVC0_3D(SERIALIZE), 0);
  52    IMMED_NVC0(push, NVC0_3D(TEX_CACHE_CTL), 0);
  53 }
  54
  55 static void
  56 nvc0_memory_barrier(struct pipe_context *pipe, unsigned flags)
  57 {
  58    struct nvc0_context *nvc0 = nvc0_context(pipe);
  59    struct nouveau_pushbuf *push = nvc0->base.pushbuf;
  60    int i, s;
  61
  62    if (flags & PIPE_BARRIER_MAPPED_BUFFER) {
  63       for (i = 0; i < nvc0->num_vtxbufs; ++i) {
  64          if (!nvc0->vtxbuf[i].buffer)
  65             continue;
  66          if (nvc0->vtxbuf[i].buffer->flags & PIPE_RESOURCE_FLAG_MAP_PERSISTENT)
  67             nvc0->base.vbo_dirty = true;
  68       }
  69
  70       if (nvc0->idxbuf.buffer &&
  71           nvc0->idxbuf.buffer->flags & PIPE_RESOURCE_FLAG_MAP_PERSISTENT)
  72          nvc0->base.vbo_dirty = true;
  73
  74       for (s = 0; s < 5 && !nvc0->cb_dirty; ++s) {
  75          uint32_t valid = nvc0->constbuf_valid[s];
  76
  77          while (valid && !nvc0->cb_dirty) {
  78             const unsigned i = ffs(valid) - 1;
  79             struct pipe_resource *res;
  80
  81             valid &= ~(1 << i);
  82             if (nvc0->constbuf[s][i].user)
  83                continue;
  84
  85             res = nvc0->constbuf[s][i].u.buf;
  86             if (!res)
  87                continue;
  88
  89             if (res->flags & PIPE_RESOURCE_FLAG_MAP_PERSISTENT)
  90                nvc0->cb_dirty = true;
  91          }
  92       }
  93    } else {
  94       /* Pretty much any writing by shaders needs a serialize after
  95        * it. Especially when moving between 3d and compute pipelines, but even
  96        * without that.
  97        */
  98       IMMED_NVC0(push, NVC0_3D(SERIALIZE), 0);
  99    }
 100
 101    /* If we're going to texture from a buffer/image written by a shader, we
 102     * must flush the texture cache.
 103     */
 104    if (flags & PIPE_BARRIER_TEXTURE)
 105       IMMED_NVC0(push, NVC0_3D(TEX_CACHE_CTL), 0);
 106
 107    if (flags & PIPE_BARRIER_CONSTANT_BUFFER)
 108       nvc0->cb_dirty = true;
 109    if (flags & (PIPE_BARRIER_VERTEX_BUFFER | PIPE_BARRIER_INDEX_BUFFER))
 110       nvc0->base.vbo_dirty = true;
 111 }
 112
 113 static void
 114 nvc0_emit_string_marker(struct pipe_context *pipe, const char *str, int len)
 115 {
 116    struct nouveau_pushbuf *push = nvc0_context(pipe)->base.pushbuf;
 117    int string_words = len / 4;
 118    int data_words;
 119
 120    if (len <= 0)
 121       return;
 122    string_words = MIN2(string_words, NV04_PFIFO_MAX_PACKET_LEN);
 123    if (string_words == NV04_PFIFO_MAX_PACKET_LEN)
 124       data_words = string_words;
 125    else
 126       data_words = string_words + !!(len & 3);
 127    BEGIN_NIC0(push, SUBC_3D(NV04_GRAPH_NOP), data_words);
 128    if (string_words)
 129       PUSH_DATAp(push, str, string_words);
 130    if (string_words != data_words) {
 131       int data = 0;
 132       memcpy(&data, &str[string_words * 4], len & 3);
 133       PUSH_DATA (push, data);
 134    }
 135 }
 136
 137 static void
 138 nvc0_context_unreference_resources(struct nvc0_context *nvc0)
 139 {
 140    unsigned s, i;
 141
 142    nouveau_bufctx_del(&nvc0->bufctx_3d);
 143    nouveau_bufctx_del(&nvc0->bufctx);
 144    nouveau_bufctx_del(&nvc0->bufctx_cp);
 145
 146    util_unreference_framebuffer_state(&nvc0->framebuffer);
 147
 148    for (i = 0; i < nvc0->num_vtxbufs; ++i)
 149       pipe_resource_reference(&nvc0->vtxbuf[i].buffer, NULL);
 150
 151    pipe_resource_reference(&nvc0->idxbuf.buffer, NULL);
 152
 153    for (s = 0; s < 6; ++s) {
 154       for (i = 0; i < nvc0->num_textures[s]; ++i)
 155          pipe_sampler_view_reference(&nvc0->textures[s][i], NULL);
 156
 157       for (i = 0; i < NVC0_MAX_PIPE_CONSTBUFS; ++i)
 158          if (!nvc0->constbuf[s][i].user)
 159             pipe_resource_reference(&nvc0->constbuf[s][i].u.buf, NULL);
 160
 161       for (i = 0; i < NVC0_MAX_BUFFERS; ++i)
 162          pipe_resource_reference(&nvc0->buffers[s][i].buffer, NULL);
 163
 164       for (i = 0; i < NVC0_MAX_IMAGES; ++i) {
 165          pipe_resource_reference(&nvc0->images[s][i].resource, NULL);
 166          if (nvc0->screen->base.class_3d >= GM107_3D_CLASS)
 167             pipe_sampler_view_reference(&nvc0->images_tic[s][i], NULL);
 168       }
 169    }
 170
 171    for (s = 0; s < 2; ++s) {
 172       for (i = 0; i < NVC0_MAX_SURFACE_SLOTS; ++i)
 173          pipe_surface_reference(&nvc0->surfaces[s][i], NULL);
 174    }
 175
 176    for (i = 0; i < nvc0->num_tfbbufs; ++i)
 177       pipe_so_target_reference(&nvc0->tfbbuf[i], NULL);
 178
 179    for (i = 0; i < nvc0->global_residents.size / sizeof(struct pipe_resource *);
 180         ++i) {
 181       struct pipe_resource **res = util_dynarray_element(
 182          &nvc0->global_residents, struct pipe_resource *, i);
 183       pipe_resource_reference(res, NULL);
 184    }
 185    util_dynarray_fini(&nvc0->global_residents);
 186
 187    if (nvc0->tcp_empty)
 188       nvc0->base.pipe.delete_tcs_state(&nvc0->base.pipe, nvc0->tcp_empty);
 189 }
 190
 191 static void
 192 nvc0_destroy(struct pipe_context *pipe)
 193 {
 194    struct nvc0_context *nvc0 = nvc0_context(pipe);
 195
 196    if (nvc0->screen->cur_ctx == nvc0) {
 197       nvc0->screen->cur_ctx = NULL;
 198       nvc0->screen->save_state = nvc0->state;
 199       nvc0->screen->save_state.tfb = NULL;
 200    }
 201
 202    /* Unset bufctx, we don't want to revalidate any resources after the flush.
 203     * Other contexts will always set their bufctx again on action calls.
 204     */
 205    nouveau_pushbuf_bufctx(nvc0->base.pushbuf, NULL);
 206    nouveau_pushbuf_kick(nvc0->base.pushbuf, nvc0->base.pushbuf->channel);
 207
 208    nvc0_context_unreference_resources(nvc0);
 209    nvc0_blitctx_destroy(nvc0);
 210
 211    nouveau_context_destroy(&nvc0->base);
 212 }
 213
 214 void
 215 nvc0_default_kick_notify(struct nouveau_pushbuf *push)
 216 {
 217    struct nvc0_screen *screen = push->user_priv;
 218
 219    if (screen) {
 220       nouveau_fence_next(&screen->base);
 221       nouveau_fence_update(&screen->base, true);
 222       if (screen->cur_ctx)
 223          screen->cur_ctx->state.flushed = true;
 224       NOUVEAU_DRV_STAT(&screen->base, pushbuf_count, 1);
 225    }
 226 }
 227
 228 static int
 229 nvc0_invalidate_resource_storage(struct nouveau_context *ctx,
 230                                  struct pipe_resource *res,
 231                                  int ref)
 232 {
 233    struct nvc0_context *nvc0 = nvc0_context(&ctx->pipe);
 234    unsigned s, i;
 235
 236    if (res->bind & PIPE_BIND_RENDER_TARGET) {
 237       for (i = 0; i < nvc0->framebuffer.nr_cbufs; ++i) {
 238          if (nvc0->framebuffer.cbufs[i] &&
 239              nvc0->framebuffer.cbufs[i]->texture == res) {
 240             nvc0->dirty_3d |= NVC0_NEW_3D_FRAMEBUFFER;
 241             nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_FB);
 242             if (!--ref)
 243                return ref;
 244          }
 245       }
 246    }
 247    if (res->bind & PIPE_BIND_DEPTH_STENCIL) {
 248       if (nvc0->framebuffer.zsbuf &&
 249           nvc0->framebuffer.zsbuf->texture == res) {
 250          nvc0->dirty_3d |= NVC0_NEW_3D_FRAMEBUFFER;
 251          nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_FB);
 252          if (!--ref)
 253             return ref;
 254       }
 255    }
 256
 257    if (res->target == PIPE_BUFFER) {
 258       for (i = 0; i < nvc0->num_vtxbufs; ++i) {
 259          if (nvc0->vtxbuf[i].buffer == res) {
 260             nvc0->dirty_3d |= NVC0_NEW_3D_ARRAYS;
 261             nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_VTX);
 262             if (!--ref)
 263                return ref;
 264          }
 265       }
 266
 267       if (nvc0->idxbuf.buffer == res) {
 268          nvc0->dirty_3d |= NVC0_NEW_3D_IDXBUF;
 269          nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_IDX);
 270          if (!--ref)
 271             return ref;
 272       }
 273
 274       for (s = 0; s < 6; ++s) {
 275          for (i = 0; i < nvc0->num_textures[s]; ++i) {
 276             if (nvc0->textures[s][i] &&
 277                 nvc0->textures[s][i]->texture == res) {
 278                nvc0->textures_dirty[s] |= 1 << i;
 279                if (unlikely(s == 5)) {
 280                   nvc0->dirty_cp |= NVC0_NEW_CP_TEXTURES;
 281                   nouveau_bufctx_reset(nvc0->bufctx_cp, NVC0_BIND_CP_TEX(i));
 282                } else {
 283                   nvc0->dirty_3d |= NVC0_NEW_3D_TEXTURES;
 284                   nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_TEX(s, i));
 285                }
 286                if (!--ref)
 287                   return ref;
 288             }
 289          }
 290       }
 291
 292       for (s = 0; s < 6; ++s) {
 293          for (i = 0; i < NVC0_MAX_PIPE_CONSTBUFS; ++i) {
 294             if (!(nvc0->constbuf_valid[s] & (1 << i)))
 295                continue;
 296             if (!nvc0->constbuf[s][i].user &&
 297                 nvc0->constbuf[s][i].u.buf == res) {
 298                nvc0->constbuf_dirty[s] |= 1 << i;
 299                if (unlikely(s == 5)) {
 300                   nvc0->dirty_cp |= NVC0_NEW_CP_CONSTBUF;
 301                   nouveau_bufctx_reset(nvc0->bufctx_cp, NVC0_BIND_CP_CB(i));
 302                } else {
 303                   nvc0->dirty_3d |= NVC0_NEW_3D_CONSTBUF;
 304                   nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_CB(s, i));
 305                }
 306                if (!--ref)
 307                   return ref;
 308             }
 309          }
 310       }
 311
 312       for (s = 0; s < 6; ++s) {
 313          for (i = 0; i < NVC0_MAX_BUFFERS; ++i) {
 314             if (nvc0->buffers[s][i].buffer == res) {
 315                nvc0->buffers_dirty[s] |= 1 << i;
 316                if (unlikely(s == 5)) {
 317                   nvc0->dirty_cp |= NVC0_NEW_CP_BUFFERS;
 318                   nouveau_bufctx_reset(nvc0->bufctx_cp, NVC0_BIND_CP_BUF);
 319                } else {
 320                   nvc0->dirty_3d |= NVC0_NEW_3D_BUFFERS;
 321                   nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_BUF);
 322                }
 323                if (!--ref)
 324                   return ref;
 325             }
 326          }
 327       }
 328
 329       for (s = 0; s < 6; ++s) {
 330          for (i = 0; i < NVC0_MAX_IMAGES; ++i) {
 331             if (nvc0->images[s][i].resource == res) {
 332                nvc0->images_dirty[s] |= 1 << i;
 333                if (unlikely(s == 5)) {
 334                   nvc0->dirty_cp |= NVC0_NEW_CP_SURFACES;
 335                   nouveau_bufctx_reset(nvc0->bufctx_cp, NVC0_BIND_CP_SUF);
 336                } else {
 337                   nvc0->dirty_3d |= NVC0_NEW_3D_SURFACES;
 338                   nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_SUF);
 339                }
 340             }
 341             if (!--ref)
 342                return ref;
 343          }
 344       }
 345    }
 346
 347    return ref;
 348 }
 349
 350 static void
 351 nvc0_context_get_sample_position(struct pipe_context *, unsigned, unsigned,
 352                                  float *);
 353
 354 struct pipe_context *
 355 nvc0_create(struct pipe_screen *pscreen, void *priv, unsigned ctxflags)
 356 {
 357    struct nvc0_screen *screen = nvc0_screen(pscreen);
 358    struct nvc0_context *nvc0;
 359    struct pipe_context *pipe;
 360    int ret;
 361    uint32_t flags;
 362
 363    nvc0 = CALLOC_STRUCT(nvc0_context);
 364    if (!nvc0)
 365       return NULL;
 366    pipe = &nvc0->base.pipe;
 367
 368    if (!nvc0_blitctx_create(nvc0))
 369       goto out_err;
 370
 371    nvc0->base.pushbuf = screen->base.pushbuf;
 372    nvc0->base.client = screen->base.client;
 373
 374    ret = nouveau_bufctx_new(screen->base.client, 2, &nvc0->bufctx);
 375    if (!ret)
 376       ret = nouveau_bufctx_new(screen->base.client, NVC0_BIND_3D_COUNT,
 377                                &nvc0->bufctx_3d);
 378    if (!ret)
 379       ret = nouveau_bufctx_new(screen->base.client, NVC0_BIND_CP_COUNT,
 380                                &nvc0->bufctx_cp);
 381    if (ret)
 382       goto out_err;
 383
 384    nvc0->screen = screen;
 385    nvc0->base.screen = &screen->base;
 386
 387    pipe->screen = pscreen;
 388    pipe->priv = priv;
 389
 390    pipe->destroy = nvc0_destroy;
 391
 392    pipe->draw_vbo = nvc0_draw_vbo;
 393    pipe->clear = nvc0_clear;
 394    pipe->launch_grid = (nvc0->screen->base.class_3d >= NVE4_3D_CLASS) ?
 395       nve4_launch_grid : nvc0_launch_grid;
 396
 397    pipe->flush = nvc0_flush;
 398    pipe->texture_barrier = nvc0_texture_barrier;
 399    pipe->memory_barrier = nvc0_memory_barrier;
 400    pipe->get_sample_position = nvc0_context_get_sample_position;
 401    pipe->emit_string_marker = nvc0_emit_string_marker;
 402
 403    nouveau_context_init(&nvc0->base);
 404    nvc0_init_query_functions(nvc0);
 405    nvc0_init_surface_functions(nvc0);
 406    nvc0_init_state_functions(nvc0);
 407    nvc0_init_transfer_functions(nvc0);
 408    nvc0_init_resource_functions(pipe);
 409
 410    nvc0->base.invalidate_resource_storage = nvc0_invalidate_resource_storage;
 411
 412    pipe->create_video_codec = nvc0_create_decoder;
 413    pipe->create_video_buffer = nvc0_video_buffer_create;
 414
 415    /* shader builtin library is per-screen, but we need a context for m2mf */
 416    nvc0_program_library_upload(nvc0);
 417    nvc0_program_init_tcp_empty(nvc0);
 418    if (!nvc0->tcp_empty)
 419       goto out_err;
 420    /* set the empty tctl prog on next draw in case one is never set */
 421    nvc0->dirty_3d |= NVC0_NEW_3D_TCTLPROG;
 422
 423    /* Do not bind the COMPUTE driver constbuf at screen initialization because
 424     * CBs are aliased between 3D and COMPUTE, but make sure it will be bound if
 425     * a grid is launched later. */
 426    nvc0->dirty_cp |= NVC0_NEW_CP_DRIVERCONST;
 427
 428    /* now that there are no more opportunities for errors, set the current
 429     * context if there isn't already one.
 430     */
 431    if (!screen->cur_ctx) {
 432       nvc0->state = screen->save_state;
 433       screen->cur_ctx = nvc0;
 434       nouveau_pushbuf_bufctx(screen->base.pushbuf, nvc0->bufctx);
 435    }
 436    screen->base.pushbuf->kick_notify = nvc0_default_kick_notify;
 437
 438    /* add permanently resident buffers to bufctxts */
 439
 440    flags = NV_VRAM_DOMAIN(&screen->base) | NOUVEAU_BO_RD;
 441
 442    BCTX_REFN_bo(nvc0->bufctx_3d, 3D_SCREEN, flags, screen->text);
 443    BCTX_REFN_bo(nvc0->bufctx_3d, 3D_SCREEN, flags, screen->uniform_bo);
 444    BCTX_REFN_bo(nvc0->bufctx_3d, 3D_SCREEN, flags, screen->txc);
 445    if (screen->compute) {
 446       BCTX_REFN_bo(nvc0->bufctx_cp, CP_SCREEN, flags, screen->text);
 447       BCTX_REFN_bo(nvc0->bufctx_cp, CP_SCREEN, flags, screen->uniform_bo);
 448       BCTX_REFN_bo(nvc0->bufctx_cp, CP_SCREEN, flags, screen->txc);
 449    }
 450
 451    flags = NV_VRAM_DOMAIN(&screen->base) | NOUVEAU_BO_RDWR;
 452
 453    if (screen->poly_cache)
 454       BCTX_REFN_bo(nvc0->bufctx_3d, 3D_SCREEN, flags, screen->poly_cache);
 455    if (screen->compute)
 456       BCTX_REFN_bo(nvc0->bufctx_cp, CP_SCREEN, flags, screen->tls);
 457
 458    flags = NOUVEAU_BO_GART | NOUVEAU_BO_WR;
 459
 460    BCTX_REFN_bo(nvc0->bufctx_3d, 3D_SCREEN, flags, screen->fence.bo);
 461    BCTX_REFN_bo(nvc0->bufctx, FENCE, flags, screen->fence.bo);
 462    if (screen->compute)
 463       BCTX_REFN_bo(nvc0->bufctx_cp, CP_SCREEN, flags, screen->fence.bo);
 464
 465    nvc0->base.scratch.bo_size = 2 << 20;
 466
 467    memset(nvc0->tex_handles, ~0, sizeof(nvc0->tex_handles));
 468
 469    util_dynarray_init(&nvc0->global_residents);
 470
 471    return pipe;
 472
 473 out_err:
 474    if (nvc0) {
 475       if (nvc0->bufctx_3d)
 476          nouveau_bufctx_del(&nvc0->bufctx_3d);
 477       if (nvc0->bufctx_cp)
 478          nouveau_bufctx_del(&nvc0->bufctx_cp);
 479       if (nvc0->bufctx)
 480          nouveau_bufctx_del(&nvc0->bufctx);
 481       FREE(nvc0->blit);
 482       FREE(nvc0);
 483    }
 484    return NULL;
 485 }
 486
 487 void
 488 nvc0_bufctx_fence(struct nvc0_context *nvc0, struct nouveau_bufctx *bufctx,
 489                   bool on_flush)
 490 {
 491    struct nouveau_list *list = on_flush ? &bufctx->current : &bufctx->pending;
 492    struct nouveau_list *it;
 493    NOUVEAU_DRV_STAT_IFD(unsigned count = 0);
 494
 495    for (it = list->next; it != list; it = it->next) {
 496       struct nouveau_bufref *ref = (struct nouveau_bufref *)it;
 497       struct nv04_resource *res = ref->priv;
 498       if (res)
 499          nvc0_resource_validate(res, (unsigned)ref->priv_data);
 500       NOUVEAU_DRV_STAT_IFD(count++);
 501    }
 502    NOUVEAU_DRV_STAT(&nvc0->screen->base, resource_validate_count, count);
 503 }
 504
 505 const void *
 506 nvc0_get_sample_locations(unsigned sample_count)
 507 {
 508    static const uint8_t ms1[1][2] = { { 0x8, 0x8 } };
 509    static const uint8_t ms2[2][2] = {
 510       { 0x4, 0x4 }, { 0xc, 0xc } }; /* surface coords (0,0), (1,0) */
 511    static const uint8_t ms4[4][2] = {
 512       { 0x6, 0x2 }, { 0xe, 0x6 },   /* (0,0), (1,0) */
 513       { 0x2, 0xa }, { 0xa, 0xe } }; /* (0,1), (1,1) */
 514    static const uint8_t ms8[8][2] = {
 515       { 0x1, 0x7 }, { 0x5, 0x3 },   /* (0,0), (1,0) */
 516       { 0x3, 0xd }, { 0x7, 0xb },   /* (0,1), (1,1) */
 517       { 0x9, 0x5 }, { 0xf, 0x1 },   /* (2,0), (3,0) */
 518       { 0xb, 0xf }, { 0xd, 0x9 } }; /* (2,1), (3,1) */
 519 #if 0
 520    /* NOTE: there are alternative modes for MS2 and MS8, currently not used */
 521    static const uint8_t ms8_alt[8][2] = {
 522       { 0x9, 0x5 }, { 0x7, 0xb },   /* (2,0), (1,1) */
 523       { 0xd, 0x9 }, { 0x5, 0x3 },   /* (3,1), (1,0) */
 524       { 0x3, 0xd }, { 0x1, 0x7 },   /* (0,1), (0,0) */
 525       { 0xb, 0xf }, { 0xf, 0x1 } }; /* (2,1), (3,0) */
 526 #endif
 527
 528    const uint8_t (*ptr)[2];
 529
 530    switch (sample_count) {
 531    case 0:
 532    case 1: ptr = ms1; break;
 533    case 2: ptr = ms2; break;
 534    case 4: ptr = ms4; break;
 535    case 8: ptr = ms8; break;
 536    default:
 537       assert(0);
 538       return NULL; /* bad sample count -> undefined locations */
 539    }
 540    return ptr;
 541 }
 542
 543 static void
 544 nvc0_context_get_sample_position(struct pipe_context *pipe,
 545                                  unsigned sample_count, unsigned sample_index,
 546                                  float *xy)
 547 {
 548    const uint8_t (*ptr)[2];
 549
 550    ptr = nvc0_get_sample_locations(sample_count);
 551    if (!ptr)
 552       return;
 553
 554    xy[0] = ptr[sample_index][0] * 0.0625f;
 555    xy[1] = ptr[sample_index][1] * 0.0625f;
 556 }