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       if (nvc0->idxbuf.buffer &&
  72           nvc0->idxbuf.buffer->flags & PIPE_RESOURCE_FLAG_MAP_PERSISTENT)
  73          nvc0->base.vbo_dirty = true;
  74
  75       for (s = 0; s < 5 && !nvc0->cb_dirty; ++s) {
  76          uint32_t valid = nvc0->constbuf_valid[s];
  77
  78          while (valid && !nvc0->cb_dirty) {
  79             const unsigned i = ffs(valid) - 1;
  80             struct pipe_resource *res;
  81
  82             valid &= ~(1 << i);
  83             if (nvc0->constbuf[s][i].user)
  84                continue;
  85
  86             res = nvc0->constbuf[s][i].u.buf;
  87             if (!res)
  88                continue;
  89
  90             if (res->flags & PIPE_RESOURCE_FLAG_MAP_PERSISTENT)
  91                nvc0->cb_dirty = true;
  92          }
  93       }
  94    } else {
  95       /* Pretty much any writing by shaders needs a serialize after
  96        * it. Especially when moving between 3d and compute pipelines, but even
  97        * without that.
  98        */
  99       IMMED_NVC0(push, NVC0_3D(SERIALIZE), 0);
 100    }
 101
 102    /* If we're going to texture from a buffer/image written by a shader, we
 103     * must flush the texture cache.
 104     */
 105    if (flags & PIPE_BARRIER_TEXTURE)
 106       IMMED_NVC0(push, NVC0_3D(TEX_CACHE_CTL), 0);
 107
 108    if (flags & PIPE_BARRIER_CONSTANT_BUFFER)
 109       nvc0->cb_dirty = true;
 110    if (flags & (PIPE_BARRIER_VERTEX_BUFFER | PIPE_BARRIER_INDEX_BUFFER))
 111       nvc0->base.vbo_dirty = true;
 112 }
 113
 114 static void
 115 nvc0_emit_string_marker(struct pipe_context *pipe, const char *str, int len)
 116 {
 117    struct nouveau_pushbuf *push = nvc0_context(pipe)->base.pushbuf;
 118    int string_words = len / 4;
 119    int data_words;
 120
 121    if (len <= 0)
 122       return;
 123    string_words = MIN2(string_words, NV04_PFIFO_MAX_PACKET_LEN);
 124    if (string_words == NV04_PFIFO_MAX_PACKET_LEN)
 125       data_words = string_words;
 126    else
 127       data_words = string_words + !!(len & 3);
 128    BEGIN_NIC0(push, SUBC_3D(NV04_GRAPH_NOP), data_words);
 129    if (string_words)
 130       PUSH_DATAp(push, str, string_words);
 131    if (string_words != data_words) {
 132       int data = 0;
 133       memcpy(&data, &str[string_words * 4], len & 3);
 134       PUSH_DATA (push, data);
 135    }
 136 }
 137
 138 static void
 139 nvc0_context_unreference_resources(struct nvc0_context *nvc0)
 140 {
 141    unsigned s, i;
 142
 143    nouveau_bufctx_del(&nvc0->bufctx_3d);
 144    nouveau_bufctx_del(&nvc0->bufctx);
 145    nouveau_bufctx_del(&nvc0->bufctx_cp);
 146
 147    util_unreference_framebuffer_state(&nvc0->framebuffer);
 148
 149    for (i = 0; i < nvc0->num_vtxbufs; ++i)
 150       pipe_vertex_buffer_unreference(&nvc0->vtxbuf[i]);
 151
 152    pipe_resource_reference(&nvc0->idxbuf.buffer, NULL);
 153
 154    for (s = 0; s < 6; ++s) {
 155       for (i = 0; i < nvc0->num_textures[s]; ++i)
 156          pipe_sampler_view_reference(&nvc0->textures[s][i], NULL);
 157
 158       for (i = 0; i < NVC0_MAX_PIPE_CONSTBUFS; ++i)
 159          if (!nvc0->constbuf[s][i].user)
 160             pipe_resource_reference(&nvc0->constbuf[s][i].u.buf, NULL);
 161
 162       for (i = 0; i < NVC0_MAX_BUFFERS; ++i)
 163          pipe_resource_reference(&nvc0->buffers[s][i].buffer, NULL);
 164
 165       for (i = 0; i < NVC0_MAX_IMAGES; ++i) {
 166          pipe_resource_reference(&nvc0->images[s][i].resource, NULL);
 167          if (nvc0->screen->base.class_3d >= GM107_3D_CLASS)
 168             pipe_sampler_view_reference(&nvc0->images_tic[s][i], NULL);
 169       }
 170    }
 171
 172    for (s = 0; s < 2; ++s) {
 173       for (i = 0; i < NVC0_MAX_SURFACE_SLOTS; ++i)
 174          pipe_surface_reference(&nvc0->surfaces[s][i], NULL);
 175    }
 176
 177    for (i = 0; i < nvc0->num_tfbbufs; ++i)
 178       pipe_so_target_reference(&nvc0->tfbbuf[i], NULL);
 179
 180    for (i = 0; i < nvc0->global_residents.size / sizeof(struct pipe_resource *);
 181         ++i) {
 182       struct pipe_resource **res = util_dynarray_element(
 183          &nvc0->global_residents, struct pipe_resource *, i);
 184       pipe_resource_reference(res, NULL);
 185    }
 186    util_dynarray_fini(&nvc0->global_residents);
 187
 188    if (nvc0->tcp_empty)
 189       nvc0->base.pipe.delete_tcs_state(&nvc0->base.pipe, nvc0->tcp_empty);
 190 }
 191
 192 static void
 193 nvc0_destroy(struct pipe_context *pipe)
 194 {
 195    struct nvc0_context *nvc0 = nvc0_context(pipe);
 196
 197    if (nvc0->screen->cur_ctx == nvc0) {
 198       nvc0->screen->cur_ctx = NULL;
 199       nvc0->screen->save_state = nvc0->state;
 200       nvc0->screen->save_state.tfb = NULL;
 201    }
 202
 203    if (nvc0->base.pipe.stream_uploader)
 204       u_upload_destroy(nvc0->base.pipe.stream_uploader);
 205
 206    /* Unset bufctx, we don't want to revalidate any resources after the flush.
 207     * Other contexts will always set their bufctx again on action calls.
 208     */
 209    nouveau_pushbuf_bufctx(nvc0->base.pushbuf, NULL);
 210    nouveau_pushbuf_kick(nvc0->base.pushbuf, nvc0->base.pushbuf->channel);
 211
 212    nvc0_context_unreference_resources(nvc0);
 213    nvc0_blitctx_destroy(nvc0);
 214
 215    nouveau_context_destroy(&nvc0->base);
 216 }
 217
 218 void
 219 nvc0_default_kick_notify(struct nouveau_pushbuf *push)
 220 {
 221    struct nvc0_screen *screen = push->user_priv;
 222
 223    if (screen) {
 224       nouveau_fence_next(&screen->base);
 225       nouveau_fence_update(&screen->base, true);
 226       if (screen->cur_ctx)
 227          screen->cur_ctx->state.flushed = true;
 228       NOUVEAU_DRV_STAT(&screen->base, pushbuf_count, 1);
 229    }
 230 }
 231
 232 static int
 233 nvc0_invalidate_resource_storage(struct nouveau_context *ctx,
 234                                  struct pipe_resource *res,
 235                                  int ref)
 236 {
 237    struct nvc0_context *nvc0 = nvc0_context(&ctx->pipe);
 238    unsigned s, i;
 239
 240    if (res->bind & PIPE_BIND_RENDER_TARGET) {
 241       for (i = 0; i < nvc0->framebuffer.nr_cbufs; ++i) {
 242          if (nvc0->framebuffer.cbufs[i] &&
 243              nvc0->framebuffer.cbufs[i]->texture == res) {
 244             nvc0->dirty_3d |= NVC0_NEW_3D_FRAMEBUFFER;
 245             nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_FB);
 246             if (!--ref)
 247                return ref;
 248          }
 249       }
 250    }
 251    if (res->bind & PIPE_BIND_DEPTH_STENCIL) {
 252       if (nvc0->framebuffer.zsbuf &&
 253           nvc0->framebuffer.zsbuf->texture == res) {
 254          nvc0->dirty_3d |= NVC0_NEW_3D_FRAMEBUFFER;
 255          nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_FB);
 256          if (!--ref)
 257             return ref;
 258       }
 259    }
 260
 261    if (res->target == PIPE_BUFFER) {
 262       for (i = 0; i < nvc0->num_vtxbufs; ++i) {
 263          if (nvc0->vtxbuf[i].buffer.resource == res) {
 264             nvc0->dirty_3d |= NVC0_NEW_3D_ARRAYS;
 265             nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_VTX);
 266             if (!--ref)
 267                return ref;
 268          }
 269       }
 270
 271       if (nvc0->idxbuf.buffer == res) {
 272          nvc0->dirty_3d |= NVC0_NEW_3D_IDXBUF;
 273          nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_IDX);
 274          if (!--ref)
 275             return ref;
 276       }
 277
 278       for (s = 0; s < 6; ++s) {
 279          for (i = 0; i < nvc0->num_textures[s]; ++i) {
 280             if (nvc0->textures[s][i] &&
 281                 nvc0->textures[s][i]->texture == res) {
 282                nvc0->textures_dirty[s] |= 1 << i;
 283                if (unlikely(s == 5)) {
 284                   nvc0->dirty_cp |= NVC0_NEW_CP_TEXTURES;
 285                   nouveau_bufctx_reset(nvc0->bufctx_cp, NVC0_BIND_CP_TEX(i));
 286                } else {
 287                   nvc0->dirty_3d |= NVC0_NEW_3D_TEXTURES;
 288                   nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_TEX(s, i));
 289                }
 290                if (!--ref)
 291                   return ref;
 292             }
 293          }
 294       }
 295
 296       for (s = 0; s < 6; ++s) {
 297          for (i = 0; i < NVC0_MAX_PIPE_CONSTBUFS; ++i) {
 298             if (!(nvc0->constbuf_valid[s] & (1 << i)))
 299                continue;
 300             if (!nvc0->constbuf[s][i].user &&
 301                 nvc0->constbuf[s][i].u.buf == res) {
 302                nvc0->constbuf_dirty[s] |= 1 << i;
 303                if (unlikely(s == 5)) {
 304                   nvc0->dirty_cp |= NVC0_NEW_CP_CONSTBUF;
 305                   nouveau_bufctx_reset(nvc0->bufctx_cp, NVC0_BIND_CP_CB(i));
 306                } else {
 307                   nvc0->dirty_3d |= NVC0_NEW_3D_CONSTBUF;
 308                   nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_CB(s, i));
 309                }
 310                if (!--ref)
 311                   return ref;
 312             }
 313          }
 314       }
 315
 316       for (s = 0; s < 6; ++s) {
 317          for (i = 0; i < NVC0_MAX_BUFFERS; ++i) {
 318             if (nvc0->buffers[s][i].buffer == res) {
 319                nvc0->buffers_dirty[s] |= 1 << i;
 320                if (unlikely(s == 5)) {
 321                   nvc0->dirty_cp |= NVC0_NEW_CP_BUFFERS;
 322                   nouveau_bufctx_reset(nvc0->bufctx_cp, NVC0_BIND_CP_BUF);
 323                } else {
 324                   nvc0->dirty_3d |= NVC0_NEW_3D_BUFFERS;
 325                   nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_BUF);
 326                }
 327                if (!--ref)
 328                   return ref;
 329             }
 330          }
 331       }
 332
 333       for (s = 0; s < 6; ++s) {
 334          for (i = 0; i < NVC0_MAX_IMAGES; ++i) {
 335             if (nvc0->images[s][i].resource == res) {
 336                nvc0->images_dirty[s] |= 1 << i;
 337                if (unlikely(s == 5)) {
 338                   nvc0->dirty_cp |= NVC0_NEW_CP_SURFACES;
 339                   nouveau_bufctx_reset(nvc0->bufctx_cp, NVC0_BIND_CP_SUF);
 340                } else {
 341                   nvc0->dirty_3d |= NVC0_NEW_3D_SURFACES;
 342                   nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_SUF);
 343                }
 344             }
 345             if (!--ref)
 346                return ref;
 347          }
 348       }
 349    }
 350
 351    return ref;
 352 }
 353
 354 static void
 355 nvc0_context_get_sample_position(struct pipe_context *, unsigned, unsigned,
 356                                  float *);
 357
 358 struct pipe_context *
 359 nvc0_create(struct pipe_screen *pscreen, void *priv, unsigned ctxflags)
 360 {
 361    struct nvc0_screen *screen = nvc0_screen(pscreen);
 362    struct nvc0_context *nvc0;
 363    struct pipe_context *pipe;
 364    int ret;
 365    uint32_t flags;
 366
 367    nvc0 = CALLOC_STRUCT(nvc0_context);
 368    if (!nvc0)
 369       return NULL;
 370    pipe = &nvc0->base.pipe;
 371
 372    if (!nvc0_blitctx_create(nvc0))
 373       goto out_err;
 374
 375    nvc0->base.pushbuf = screen->base.pushbuf;
 376    nvc0->base.client = screen->base.client;
 377
 378    ret = nouveau_bufctx_new(screen->base.client, 2, &nvc0->bufctx);
 379    if (!ret)
 380       ret = nouveau_bufctx_new(screen->base.client, NVC0_BIND_3D_COUNT,
 381                                &nvc0->bufctx_3d);
 382    if (!ret)
 383       ret = nouveau_bufctx_new(screen->base.client, NVC0_BIND_CP_COUNT,
 384                                &nvc0->bufctx_cp);
 385    if (ret)
 386       goto out_err;
 387
 388    nvc0->screen = screen;
 389    nvc0->base.screen = &screen->base;
 390
 391    pipe->screen = pscreen;
 392    pipe->priv = priv;
 393    pipe->stream_uploader = u_upload_create_default(pipe);
 394    if (!pipe->stream_uploader)
 395       goto out_err;
 396    pipe->const_uploader = pipe->stream_uploader;
 397
 398    pipe->destroy = nvc0_destroy;
 399
 400    pipe->draw_vbo = nvc0_draw_vbo;
 401    pipe->clear = nvc0_clear;
 402    pipe->launch_grid = (nvc0->screen->base.class_3d >= NVE4_3D_CLASS) ?
 403       nve4_launch_grid : nvc0_launch_grid;
 404
 405    pipe->flush = nvc0_flush;
 406    pipe->texture_barrier = nvc0_texture_barrier;
 407    pipe->memory_barrier = nvc0_memory_barrier;
 408    pipe->get_sample_position = nvc0_context_get_sample_position;
 409    pipe->emit_string_marker = nvc0_emit_string_marker;
 410
 411    nouveau_context_init(&nvc0->base);
 412    nvc0_init_query_functions(nvc0);
 413    nvc0_init_surface_functions(nvc0);
 414    nvc0_init_state_functions(nvc0);
 415    nvc0_init_transfer_functions(nvc0);
 416    nvc0_init_resource_functions(pipe);
 417
 418    nvc0->base.invalidate_resource_storage = nvc0_invalidate_resource_storage;
 419
 420    pipe->create_video_codec = nvc0_create_decoder;
 421    pipe->create_video_buffer = nvc0_video_buffer_create;
 422
 423    /* shader builtin library is per-screen, but we need a context for m2mf */
 424    nvc0_program_library_upload(nvc0);
 425    nvc0_program_init_tcp_empty(nvc0);
 426    if (!nvc0->tcp_empty)
 427       goto out_err;
 428    /* set the empty tctl prog on next draw in case one is never set */
 429    nvc0->dirty_3d |= NVC0_NEW_3D_TCTLPROG;
 430
 431    /* Do not bind the COMPUTE driver constbuf at screen initialization because
 432     * CBs are aliased between 3D and COMPUTE, but make sure it will be bound if
 433     * a grid is launched later. */
 434    nvc0->dirty_cp |= NVC0_NEW_CP_DRIVERCONST;
 435
 436    /* now that there are no more opportunities for errors, set the current
 437     * context if there isn't already one.
 438     */
 439    if (!screen->cur_ctx) {
 440       nvc0->state = screen->save_state;
 441       screen->cur_ctx = nvc0;
 442       nouveau_pushbuf_bufctx(screen->base.pushbuf, nvc0->bufctx);
 443    }
 444    screen->base.pushbuf->kick_notify = nvc0_default_kick_notify;
 445
 446    /* add permanently resident buffers to bufctxts */
 447
 448    flags = NV_VRAM_DOMAIN(&screen->base) | NOUVEAU_BO_RD;
 449
 450    BCTX_REFN_bo(nvc0->bufctx_3d, 3D_TEXT, flags, screen->text);
 451    BCTX_REFN_bo(nvc0->bufctx_3d, 3D_SCREEN, flags, screen->uniform_bo);
 452    BCTX_REFN_bo(nvc0->bufctx_3d, 3D_SCREEN, flags, screen->txc);
 453    if (screen->compute) {
 454       BCTX_REFN_bo(nvc0->bufctx_cp, CP_TEXT, flags, screen->text);
 455       BCTX_REFN_bo(nvc0->bufctx_cp, CP_SCREEN, flags, screen->uniform_bo);
 456       BCTX_REFN_bo(nvc0->bufctx_cp, CP_SCREEN, flags, screen->txc);
 457    }
 458
 459    flags = NV_VRAM_DOMAIN(&screen->base) | NOUVEAU_BO_RDWR;
 460
 461    if (screen->poly_cache)
 462       BCTX_REFN_bo(nvc0->bufctx_3d, 3D_SCREEN, flags, screen->poly_cache);
 463    if (screen->compute)
 464       BCTX_REFN_bo(nvc0->bufctx_cp, CP_SCREEN, flags, screen->tls);
 465
 466    flags = NOUVEAU_BO_GART | NOUVEAU_BO_WR;
 467
 468    BCTX_REFN_bo(nvc0->bufctx_3d, 3D_SCREEN, flags, screen->fence.bo);
 469    BCTX_REFN_bo(nvc0->bufctx, FENCE, flags, screen->fence.bo);
 470    if (screen->compute)
 471       BCTX_REFN_bo(nvc0->bufctx_cp, CP_SCREEN, flags, screen->fence.bo);
 472
 473    nvc0->base.scratch.bo_size = 2 << 20;
 474
 475    memset(nvc0->tex_handles, ~0, sizeof(nvc0->tex_handles));
 476
 477    util_dynarray_init(&nvc0->global_residents);
 478
 479    return pipe;
 480
 481 out_err:
 482    if (nvc0) {
 483       if (pipe->stream_uploader)
 484          u_upload_destroy(pipe->stream_uploader);
 485       if (nvc0->bufctx_3d)
 486          nouveau_bufctx_del(&nvc0->bufctx_3d);
 487       if (nvc0->bufctx_cp)
 488          nouveau_bufctx_del(&nvc0->bufctx_cp);
 489       if (nvc0->bufctx)
 490          nouveau_bufctx_del(&nvc0->bufctx);
 491       FREE(nvc0->blit);
 492       FREE(nvc0);
 493    }
 494    return NULL;
 495 }
 496
 497 void
 498 nvc0_bufctx_fence(struct nvc0_context *nvc0, struct nouveau_bufctx *bufctx,
 499                   bool on_flush)
 500 {
 501    struct nouveau_list *list = on_flush ? &bufctx->current : &bufctx->pending;
 502    struct nouveau_list *it;
 503    NOUVEAU_DRV_STAT_IFD(unsigned count = 0);
 504
 505    for (it = list->next; it != list; it = it->next) {
 506       struct nouveau_bufref *ref = (struct nouveau_bufref *)it;
 507       struct nv04_resource *res = ref->priv;
 508       if (res)
 509          nvc0_resource_validate(res, (unsigned)ref->priv_data);
 510       NOUVEAU_DRV_STAT_IFD(count++);
 511    }
 512    NOUVEAU_DRV_STAT(&nvc0->screen->base, resource_validate_count, count);
 513 }
 514
 515 const void *
 516 nvc0_get_sample_locations(unsigned sample_count)
 517 {
 518    static const uint8_t ms1[1][2] = { { 0x8, 0x8 } };
 519    static const uint8_t ms2[2][2] = {
 520       { 0x4, 0x4 }, { 0xc, 0xc } }; /* surface coords (0,0), (1,0) */
 521    static const uint8_t ms4[4][2] = {
 522       { 0x6, 0x2 }, { 0xe, 0x6 },   /* (0,0), (1,0) */
 523       { 0x2, 0xa }, { 0xa, 0xe } }; /* (0,1), (1,1) */
 524    static const uint8_t ms8[8][2] = {
 525       { 0x1, 0x7 }, { 0x5, 0x3 },   /* (0,0), (1,0) */
 526       { 0x3, 0xd }, { 0x7, 0xb },   /* (0,1), (1,1) */
 527       { 0x9, 0x5 }, { 0xf, 0x1 },   /* (2,0), (3,0) */
 528       { 0xb, 0xf }, { 0xd, 0x9 } }; /* (2,1), (3,1) */
 529 #if 0
 530    /* NOTE: there are alternative modes for MS2 and MS8, currently not used */
 531    static const uint8_t ms8_alt[8][2] = {
 532       { 0x9, 0x5 }, { 0x7, 0xb },   /* (2,0), (1,1) */
 533       { 0xd, 0x9 }, { 0x5, 0x3 },   /* (3,1), (1,0) */
 534       { 0x3, 0xd }, { 0x1, 0x7 },   /* (0,1), (0,0) */
 535       { 0xb, 0xf }, { 0xf, 0x1 } }; /* (2,1), (3,0) */
 536 #endif
 537
 538    const uint8_t (*ptr)[2];
 539
 540    switch (sample_count) {
 541    case 0:
 542    case 1: ptr = ms1; break;
 543    case 2: ptr = ms2; break;
 544    case 4: ptr = ms4; break;
 545    case 8: ptr = ms8; break;
 546    default:
 547       assert(0);
 548       return NULL; /* bad sample count -> undefined locations */
 549    }
 550    return ptr;
 551 }
 552
 553 static void
 554 nvc0_context_get_sample_position(struct pipe_context *pipe,
 555                                  unsigned sample_count, unsigned sample_index,
 556                                  float *xy)
 557 {
 558    const uint8_t (*ptr)[2];
 559
 560    ptr = nvc0_get_sample_locations(sample_count);
 561    if (!ptr)
 562       return;
 563
 564    xy[0] = ptr[sample_index][0] * 0.0625f;
 565    xy[1] = ptr[sample_index][1] * 0.0625f;
 566 }