src/gallium/drivers/nv50/nv50_vbo.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 BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  18  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
  19  * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  20  * SOFTWARE.
  21  */
  22
  23 #include "pipe/p_context.h"
  24 #include "pipe/p_state.h"
  25 #include "util/u_inlines.h"
  26 #include "util/u_format.h"
  27 #include "translate/translate.h"
  28
  29 #include "nv50_context.h"
  30 #include "nv50_resource.h"
  31
  32 #include "nv50_3d.xml.h"
  33
  34 void
  35 nv50_vertex_state_delete(struct pipe_context *pipe,
  36                          void *hwcso)
  37 {
  38    struct nv50_vertex_stateobj *so = hwcso;
  39
  40    if (so->translate)
  41       so->translate->release(so->translate);
  42    FREE(hwcso);
  43 }
  44
  45 void *
  46 nv50_vertex_state_create(struct pipe_context *pipe,
  47                          unsigned num_elements,
  48                          const struct pipe_vertex_element *elements)
  49 {
  50     struct nv50_vertex_stateobj *so;
  51     struct translate_key transkey;
  52     unsigned i;
  53
  54     so = MALLOC(sizeof(*so) +
  55                 num_elements * sizeof(struct nv50_vertex_element));
  56     if (!so)
  57         return NULL;
  58     so->num_elements = num_elements;
  59     so->instance_elts = 0;
  60     so->instance_bufs = 0;
  61     so->need_conversion = FALSE;
  62
  63     memset(so->vb_access_size, 0, sizeof(so->vb_access_size));
  64
  65     transkey.nr_elements = 0;
  66     transkey.output_stride = 0;
  67
  68     for (i = 0; i < num_elements; ++i) {
  69         const struct pipe_vertex_element *ve = &elements[i];
  70         const unsigned vbi = ve->vertex_buffer_index;
  71         unsigned size;
  72         enum pipe_format fmt = ve->src_format;
  73
  74         so->element[i].pipe = elements[i];
  75         so->element[i].state = nv50_format_table[fmt].vtx;
  76
  77         if (!so->element[i].state) {
  78             switch (util_format_get_nr_components(fmt)) {
  79             case 1: fmt = PIPE_FORMAT_R32_FLOAT; break;
  80             case 2: fmt = PIPE_FORMAT_R32G32_FLOAT; break;
  81             case 3: fmt = PIPE_FORMAT_R32G32B32_FLOAT; break;
  82             case 4: fmt = PIPE_FORMAT_R32G32B32A32_FLOAT; break;
  83             default:
  84                 assert(0);
  85                 return NULL;
  86             }
  87             so->element[i].state = nv50_format_table[fmt].vtx;
  88             so->need_conversion = TRUE;
  89         }
  90         so->element[i].state |= i;
  91
  92         size = util_format_get_blocksize(fmt);
  93         if (so->vb_access_size[vbi] < (ve->src_offset + size))
  94            so->vb_access_size[vbi] = ve->src_offset + size;
  95
  96         if (1) {
  97             unsigned j = transkey.nr_elements++;
  98
  99             transkey.element[j].type = TRANSLATE_ELEMENT_NORMAL;
 100             transkey.element[j].input_format = ve->src_format;
 101             transkey.element[j].input_buffer = vbi;
 102             transkey.element[j].input_offset = ve->src_offset;
 103             transkey.element[j].instance_divisor = ve->instance_divisor;
 104
 105             transkey.element[j].output_format = fmt;
 106             transkey.element[j].output_offset = transkey.output_stride;
 107             transkey.output_stride += (util_format_get_stride(fmt, 1) + 3) & ~3;
 108
 109             if (unlikely(ve->instance_divisor)) {
 110                so->instance_elts |= 1 << i;
 111                so->instance_bufs |= 1 << vbi;
 112             }
 113         }
 114     }
 115
 116     so->translate = translate_create(&transkey);
 117     so->vertex_size = transkey.output_stride / 4;
 118     so->packet_vertex_limit = NV04_PFIFO_MAX_PACKET_LEN /
 119        MAX2(so->vertex_size, 1);
 120
 121     return so;
 122 }
 123
 124 #define NV50_3D_VERTEX_ATTRIB_INACTIVE              \
 125    NV50_3D_VERTEX_ARRAY_ATTRIB_TYPE_FLOAT |         \
 126    NV50_3D_VERTEX_ARRAY_ATTRIB_FORMAT_32_32_32_32 | \
 127    NV50_3D_VERTEX_ARRAY_ATTRIB_CONST
 128
 129 static void
 130 nv50_emit_vtxattr(struct nv50_context *nv50, struct pipe_vertex_buffer *vb,
 131                   struct pipe_vertex_element *ve, unsigned attr)
 132 {
 133    const void *data;
 134    struct nouveau_pushbuf *push = nv50->base.pushbuf;
 135    struct nv04_resource *res = nv04_resource(vb->buffer);
 136    float v[4];
 137    const unsigned nc = util_format_get_nr_components(ve->src_format);
 138
 139    data = nouveau_resource_map_offset(&nv50->base, res, vb->buffer_offset +
 140                                       ve->src_offset, NOUVEAU_BO_RD);
 141
 142    util_format_read_4f(ve->src_format, v, 0, data, 0, 0, 0, 1, 1);
 143
 144    switch (nc) {
 145    case 4:
 146       BEGIN_NV04(push, NV50_3D(VTX_ATTR_4F_X(attr)), 4);
 147       PUSH_DATAf(push, v[0]);
 148       PUSH_DATAf(push, v[1]);
 149       PUSH_DATAf(push, v[2]);
 150       PUSH_DATAf(push, v[3]);
 151       break;
 152    case 3:
 153       BEGIN_NV04(push, NV50_3D(VTX_ATTR_3F_X(attr)), 3);
 154       PUSH_DATAf(push, v[0]);
 155       PUSH_DATAf(push, v[1]);
 156       PUSH_DATAf(push, v[2]);
 157       break;
 158    case 2:
 159       BEGIN_NV04(push, NV50_3D(VTX_ATTR_2F_X(attr)), 2);
 160       PUSH_DATAf(push, v[0]);
 161       PUSH_DATAf(push, v[1]);
 162       break;
 163    case 1:
 164       if (attr == nv50->vertprog->vp.edgeflag) {
 165          BEGIN_NV04(push, NV50_3D(EDGEFLAG), 1);
 166          PUSH_DATA (push, v[0] ? 1 : 0);
 167       }
 168       BEGIN_NV04(push, NV50_3D(VTX_ATTR_1F(attr)), 1);
 169       PUSH_DATAf(push, v[0]);
 170       break;
 171    default:
 172       assert(0);
 173       break;
 174    }
 175 }
 176
 177 static INLINE void
 178 nv50_vbuf_range(struct nv50_context *nv50, int vbi,
 179                 uint32_t *base, uint32_t *size)
 180 {
 181    if (unlikely(nv50->vertex->instance_bufs & (1 << vbi))) {
 182       /* TODO: use min and max instance divisor to get a proper range */
 183       *base = 0;
 184       *size = nv50->vtxbuf[vbi].buffer->width0;
 185    } else {
 186       /* NOTE: if there are user buffers, we *must* have index bounds */
 187       assert(nv50->vb_elt_limit != ~0);
 188       *base = nv50->vb_elt_first * nv50->vtxbuf[vbi].stride;
 189       *size = nv50->vb_elt_limit * nv50->vtxbuf[vbi].stride +
 190          nv50->vertex->vb_access_size[vbi];
 191    }
 192 }
 193
 194 static void
 195 nv50_prevalidate_vbufs(struct nv50_context *nv50, unsigned limits[])
 196 {
 197    const uint32_t bo_flags = NOUVEAU_BO_RD | NOUVEAU_BO_GART;
 198    struct nouveau_bo *bo;
 199    struct pipe_vertex_buffer *vb;
 200    struct nv04_resource *buf;
 201    int i;
 202    uint32_t base, size;
 203
 204    nv50->vbo_fifo = nv50->vbo_user = 0;
 205
 206    nouveau_bufctx_reset(nv50->bufctx_3d, NV50_BIND_VERTEX);
 207
 208    for (i = 0; i < nv50->num_vtxbufs; ++i) {
 209       vb = &nv50->vtxbuf[i];
 210       limits[i] = 0;
 211       if (!vb->stride)
 212          continue;
 213       buf = nv04_resource(vb->buffer);
 214
 215       if (nouveau_resource_mapped_by_gpu(vb->buffer)) {
 216          BCTX_REFN(nv50->bufctx_3d, VERTEX, buf, RD);
 217       } else {
 218          if (nv50->vbo_push_hint) {
 219             nv50->vbo_fifo = ~0;
 220             return;
 221          }
 222          nv50->base.vbo_dirty = TRUE;
 223
 224          if (buf->status & NOUVEAU_BUFFER_STATUS_USER_MEMORY) {
 225             assert(vb->stride > vb->buffer_offset);
 226             nv50->vbo_user |= 1 << i;
 227             nv50_vbuf_range(nv50, i, &base, &size);
 228             limits[i] = base + size - 1;
 229             bo = nouveau_scratch_data(&nv50->base, buf, base, size);
 230             if (bo)
 231                BCTX_REFN_bo(nv50->bufctx_3d, VERTEX_TMP, bo_flags, bo);
 232          } else {
 233             if (nouveau_buffer_migrate(&nv50->base, buf, NOUVEAU_BO_GART))
 234                BCTX_REFN(nv50->bufctx_3d, VERTEX, buf, RD);
 235          }
 236       }
 237    }
 238 }
 239
 240 static void
 241 nv50_update_user_vbufs(struct nv50_context *nv50)
 242 {
 243    const uint32_t bo_flags = NOUVEAU_BO_RD | NOUVEAU_BO_GART;
 244    struct nouveau_bo *bo;
 245    struct nouveau_pushbuf *push = nv50->base.pushbuf;
 246    uint32_t base, offset, size;
 247    int i;
 248    uint32_t written = 0;
 249
 250    for (i = 0; i < nv50->vertex->num_elements; ++i) {
 251       struct pipe_vertex_element *ve = &nv50->vertex->element[i].pipe;
 252       const int b = ve->vertex_buffer_index;
 253       struct pipe_vertex_buffer *vb = &nv50->vtxbuf[b];
 254       struct nv04_resource *buf = nv04_resource(vb->buffer);
 255
 256       if (!(nv50->vbo_user & (1 << b)))
 257          continue;
 258
 259       if (!vb->stride) {
 260          nv50_emit_vtxattr(nv50, vb, ve, i);
 261          continue;
 262       }
 263       nv50_vbuf_range(nv50, b, &base, &size);
 264
 265       if (!(written & (1 << b))) {
 266          written |= 1 << b;
 267          bo = nouveau_scratch_data(&nv50->base, buf, base, size);
 268          if (bo)
 269             BCTX_REFN_bo(nv50->bufctx_3d, VERTEX_TMP, bo_flags, bo);
 270       }
 271       offset = vb->buffer_offset + ve->src_offset;
 272
 273       BEGIN_NV04(push, NV50_3D(VERTEX_ARRAY_LIMIT_HIGH(i)), 2);
 274       PUSH_DATAh(push, buf->address + base + size - 1);
 275       PUSH_DATA (push, buf->address + base + size - 1);
 276       BEGIN_NV04(push, NV50_3D(VERTEX_ARRAY_START_HIGH(i)), 2);
 277       PUSH_DATAh(push, buf->address + offset);
 278       PUSH_DATA (push, buf->address + offset);
 279    }
 280    nv50->base.vbo_dirty = TRUE;
 281 }
 282
 283 static INLINE void
 284 nv50_release_user_vbufs(struct nv50_context *nv50)
 285 {
 286    if (nv50->vbo_user) {
 287       nouveau_bufctx_reset(nv50->bufctx_3d, NV50_BIND_VERTEX_TMP);
 288       nouveau_scratch_done(&nv50->base);
 289    }
 290 }
 291
 292 void
 293 nv50_vertex_arrays_validate(struct nv50_context *nv50)
 294 {
 295    struct nouveau_pushbuf *push = nv50->base.pushbuf;
 296    struct nv50_vertex_stateobj *vertex = nv50->vertex;
 297    struct pipe_vertex_buffer *vb;
 298    struct nv50_vertex_element *ve;
 299    unsigned i;
 300    unsigned limits[PIPE_MAX_ATTRIBS]; /* user vertex buffer limits */
 301
 302    if (unlikely(vertex->need_conversion)) {
 303       nv50->vbo_fifo = ~0;
 304       nv50->vbo_user = 0;
 305    } else {
 306       nv50_prevalidate_vbufs(nv50, limits);
 307    }
 308
 309    BEGIN_NV04(push, NV50_3D(VERTEX_ARRAY_ATTRIB(0)), vertex->num_elements);
 310    for (i = 0; i < vertex->num_elements; ++i) {
 311       ve = &vertex->element[i];
 312       vb = &nv50->vtxbuf[ve->pipe.vertex_buffer_index];
 313
 314       if (likely(vb->stride) || nv50->vbo_fifo) {
 315          PUSH_DATA(push, ve->state);
 316       } else {
 317          PUSH_DATA(push, ve->state | NV50_3D_VERTEX_ARRAY_ATTRIB_CONST);
 318          nv50->vbo_fifo &= ~(1 << i);
 319       }
 320    }
 321
 322    for (i = 0; i < vertex->num_elements; ++i) {
 323       struct nv04_resource *res;
 324       unsigned limit, offset;
 325
 326       ve = &vertex->element[i];
 327       vb = &nv50->vtxbuf[ve->pipe.vertex_buffer_index];
 328
 329       if (unlikely(ve->pipe.instance_divisor)) {
 330          if (!(nv50->state.instance_elts & (1 << i))) {
 331             BEGIN_NV04(push, NV50_3D(VERTEX_ARRAY_PER_INSTANCE(i)), 1);
 332             PUSH_DATA (push, 1);
 333          }
 334          BEGIN_NV04(push, NV50_3D(VERTEX_ARRAY_DIVISOR(i)), 1);
 335          PUSH_DATA (push, ve->pipe.instance_divisor);
 336       } else
 337       if (unlikely(nv50->state.instance_elts & (1 << i))) {
 338          BEGIN_NV04(push, NV50_3D(VERTEX_ARRAY_PER_INSTANCE(i)), 1);
 339          PUSH_DATA (push, 0);
 340       }
 341
 342       res = nv04_resource(vb->buffer);
 343
 344       if (nv50->vbo_fifo || unlikely(vb->stride == 0)) {
 345          if (!nv50->vbo_fifo)
 346             nv50_emit_vtxattr(nv50, vb, &ve->pipe, i);
 347          BEGIN_NV04(push, NV50_3D(VERTEX_ARRAY_FETCH(i)), 1);
 348          PUSH_DATA (push, 0);
 349          continue;
 350       }
 351
 352       offset = ve->pipe.src_offset + vb->buffer_offset;
 353       limit = limits[ve->pipe.vertex_buffer_index];
 354       if (!limit)
 355          limit = vb->buffer->width0 - 1;
 356
 357       BEGIN_NV04(push, NV50_3D(VERTEX_ARRAY_FETCH(i)), 1);
 358       PUSH_DATA (push, NV50_3D_VERTEX_ARRAY_FETCH_ENABLE | vb->stride);
 359       BEGIN_NV04(push, NV50_3D(VERTEX_ARRAY_LIMIT_HIGH(i)), 2);
 360       PUSH_DATAh(push, res->address + limit);
 361       PUSH_DATA (push, res->address + limit);
 362       BEGIN_NV04(push, NV50_3D(VERTEX_ARRAY_START_HIGH(i)), 2);
 363       PUSH_DATAh(push, res->address + offset);
 364       PUSH_DATA (push, res->address + offset);
 365    }
 366    for (; i < nv50->state.num_vtxelts; ++i) {
 367       BEGIN_NV04(push, NV50_3D(VERTEX_ARRAY_ATTRIB(i)), 1);
 368       PUSH_DATA (push, NV50_3D_VERTEX_ATTRIB_INACTIVE);
 369       if (unlikely(nv50->state.instance_elts & (1 << i))) {
 370          BEGIN_NV04(push, NV50_3D(VERTEX_ARRAY_PER_INSTANCE(i)), 1);
 371          PUSH_DATA (push, 0);
 372       }
 373       BEGIN_NV04(push, NV50_3D(VERTEX_ARRAY_FETCH(i)), 1);
 374       PUSH_DATA (push, 0);
 375    }
 376
 377    nv50->state.num_vtxelts = vertex->num_elements;
 378    nv50->state.instance_elts = vertex->instance_elts;
 379 }
 380
 381 #define NV50_PRIM_GL_CASE(n) \
 382    case PIPE_PRIM_##n: return NV50_3D_VERTEX_BEGIN_GL_PRIMITIVE_##n
 383
 384 static INLINE unsigned
 385 nv50_prim_gl(unsigned prim)
 386 {
 387    switch (prim) {
 388    NV50_PRIM_GL_CASE(POINTS);
 389    NV50_PRIM_GL_CASE(LINES);
 390    NV50_PRIM_GL_CASE(LINE_LOOP);
 391    NV50_PRIM_GL_CASE(LINE_STRIP);
 392    NV50_PRIM_GL_CASE(TRIANGLES);
 393    NV50_PRIM_GL_CASE(TRIANGLE_STRIP);
 394    NV50_PRIM_GL_CASE(TRIANGLE_FAN);
 395    NV50_PRIM_GL_CASE(QUADS);
 396    NV50_PRIM_GL_CASE(QUAD_STRIP);
 397    NV50_PRIM_GL_CASE(POLYGON);
 398    NV50_PRIM_GL_CASE(LINES_ADJACENCY);
 399    NV50_PRIM_GL_CASE(LINE_STRIP_ADJACENCY);
 400    NV50_PRIM_GL_CASE(TRIANGLES_ADJACENCY);
 401    NV50_PRIM_GL_CASE(TRIANGLE_STRIP_ADJACENCY);
 402    default:
 403       return NV50_3D_VERTEX_BEGIN_GL_PRIMITIVE_POINTS;
 404       break;
 405    }
 406 }
 407
 408 static void
 409 nv50_draw_arrays(struct nv50_context *nv50,
 410                  unsigned mode, unsigned start, unsigned count,
 411                  unsigned instance_count)
 412 {
 413    struct nouveau_pushbuf *push = nv50->base.pushbuf;
 414    unsigned prim;
 415
 416    if (nv50->state.index_bias) {
 417       BEGIN_NV04(push, NV50_3D(VB_ELEMENT_BASE), 1);
 418       PUSH_DATA (push, 0);
 419       nv50->state.index_bias = 0;
 420    }
 421
 422    prim = nv50_prim_gl(mode);
 423
 424    while (instance_count--) {
 425       BEGIN_NV04(push, NV50_3D(VERTEX_BEGIN_GL), 1);
 426       PUSH_DATA (push, prim);
 427       BEGIN_NV04(push, NV50_3D(VERTEX_BUFFER_FIRST), 2);
 428       PUSH_DATA (push, start);
 429       PUSH_DATA (push, count);
 430       BEGIN_NV04(push, NV50_3D(VERTEX_END_GL), 1);
 431       PUSH_DATA (push, 0);
 432
 433       prim |= NV50_3D_VERTEX_BEGIN_GL_INSTANCE_NEXT;
 434    }
 435 }
 436
 437 static void
 438 nv50_draw_elements_inline_u08(struct nouveau_pushbuf *push, uint8_t *map,
 439                               unsigned start, unsigned count)
 440 {
 441    map += start;
 442
 443    if (count & 3) {
 444       unsigned i;
 445       BEGIN_NI04(push, NV50_3D(VB_ELEMENT_U32), count & 3);
 446       for (i = 0; i < (count & 3); ++i)
 447          PUSH_DATA(push, *map++);
 448       count &= ~3;
 449    }
 450    while (count) {
 451       unsigned i, nr = MIN2(count, NV04_PFIFO_MAX_PACKET_LEN * 4) / 4;
 452
 453       BEGIN_NI04(push, NV50_3D(VB_ELEMENT_U8), nr);
 454       for (i = 0; i < nr; ++i) {
 455          PUSH_DATA(push,
 456                    (map[3] << 24) | (map[2] << 16) | (map[1] << 8) | map[0]);
 457          map += 4;
 458       }
 459       count -= nr * 4;
 460    }
 461 }
 462
 463 static void
 464 nv50_draw_elements_inline_u16(struct nouveau_pushbuf *push, uint16_t *map,
 465                               unsigned start, unsigned count)
 466 {
 467    map += start;
 468
 469    if (count & 1) {
 470       count &= ~1;
 471       BEGIN_NV04(push, NV50_3D(VB_ELEMENT_U32), 1);
 472       PUSH_DATA (push, *map++);
 473    }
 474    while (count) {
 475       unsigned i, nr = MIN2(count, NV04_PFIFO_MAX_PACKET_LEN * 2) / 2;
 476
 477       BEGIN_NI04(push, NV50_3D(VB_ELEMENT_U16), nr);
 478       for (i = 0; i < nr; ++i) {
 479          PUSH_DATA(push, (map[1] << 16) | map[0]);
 480          map += 2;
 481       }
 482       count -= nr * 2;
 483    }
 484 }
 485
 486 static void
 487 nv50_draw_elements_inline_u32(struct nouveau_pushbuf *push, uint32_t *map,
 488                               unsigned start, unsigned count)
 489 {
 490    map += start;
 491
 492    while (count) {
 493       const unsigned nr = MIN2(count, NV04_PFIFO_MAX_PACKET_LEN);
 494
 495       BEGIN_NI04(push, NV50_3D(VB_ELEMENT_U32), nr);
 496       PUSH_DATAp(push, map, nr);
 497
 498       map += nr;
 499       count -= nr;
 500    }
 501 }
 502
 503 static void
 504 nv50_draw_elements_inline_u32_short(struct nouveau_pushbuf *push, uint32_t *map,
 505                                     unsigned start, unsigned count)
 506 {
 507    map += start;
 508
 509    if (count & 1) {
 510       count--;
 511       BEGIN_NV04(push, NV50_3D(VB_ELEMENT_U32), 1);
 512       PUSH_DATA (push, *map++);
 513    }
 514    while (count) {
 515       unsigned i, nr = MIN2(count, NV04_PFIFO_MAX_PACKET_LEN * 2) / 2;
 516
 517       BEGIN_NI04(push, NV50_3D(VB_ELEMENT_U16), nr);
 518       for (i = 0; i < nr; ++i) {
 519          PUSH_DATA(push, (map[1] << 16) | map[0]);
 520          map += 2;
 521       }
 522       count -= nr * 2;
 523    }
 524 }
 525
 526 static void
 527 nv50_draw_elements(struct nv50_context *nv50, boolean shorten,
 528                    unsigned mode, unsigned start, unsigned count,
 529                    unsigned instance_count, int32_t index_bias)
 530 {
 531    struct nouveau_pushbuf *push = nv50->base.pushbuf;
 532    void *data;
 533    struct nv04_resource *buf = nv04_resource(nv50->idxbuf.buffer);
 534    unsigned prim;
 535    const unsigned index_size = nv50->idxbuf.index_size;
 536
 537    prim = nv50_prim_gl(mode);
 538
 539    if (index_bias != nv50->state.index_bias) {
 540       BEGIN_NV04(push, NV50_3D(VB_ELEMENT_BASE), 1);
 541       PUSH_DATA (push, index_bias);
 542       nv50->state.index_bias = index_bias;
 543    }
 544
 545    if (nouveau_resource_mapped_by_gpu(nv50->idxbuf.buffer)) {
 546       unsigned pb_start;
 547       unsigned pb_bytes;
 548       const unsigned base = buf->offset;
 549
 550       start += nv50->idxbuf.offset >> (index_size >> 1);
 551
 552       while (instance_count--) {
 553          BEGIN_NV04(push, NV50_3D(VERTEX_BEGIN_GL), 1);
 554          PUSH_DATA (push, prim);
 555
 556          nouveau_pushbuf_space(push, 8, 0, 1);
 557
 558          switch (index_size) {
 559          case 4:
 560             BEGIN_NL50(push, NV50_3D(VB_ELEMENT_U32), count);
 561             nouveau_pushbuf_data(push, buf->bo, base + start * 4, count * 4);
 562             break;
 563          case 2:
 564             pb_start = (start & ~1) * 2;
 565             pb_bytes = ((start + count + 1) & ~1) * 2 - pb_start;
 566
 567             BEGIN_NV04(push, NV50_3D(VB_ELEMENT_U16_SETUP), 1);
 568             PUSH_DATA (push, (start << 31) | count);
 569             BEGIN_NL50(push, NV50_3D(VB_ELEMENT_U16), pb_bytes / 4);
 570             nouveau_pushbuf_data(push, buf->bo, base + pb_start, pb_bytes);
 571             BEGIN_NV04(push, NV50_3D(VB_ELEMENT_U16_SETUP), 1);
 572             PUSH_DATA (push, 0);
 573             break;
 574          default:
 575             assert(index_size == 1);
 576             pb_start = start & ~3;
 577             pb_bytes = ((start + count + 3) & ~3) - pb_start;
 578
 579             BEGIN_NV04(push, NV50_3D(VB_ELEMENT_U8_SETUP), 1);
 580             PUSH_DATA (push, (start << 30) | count);
 581             BEGIN_NL50(push, NV50_3D(VB_ELEMENT_U8), pb_bytes / 4);
 582             nouveau_pushbuf_data(push, buf->bo, base + pb_start, pb_bytes);
 583             BEGIN_NV04(push, NV50_3D(VB_ELEMENT_U8_SETUP), 1);
 584             PUSH_DATA (push, 0);
 585             break;
 586          }
 587          BEGIN_NV04(push, NV50_3D(VERTEX_END_GL), 1);
 588          PUSH_DATA (push, 0);
 589
 590          prim |= NV50_3D_VERTEX_BEGIN_GL_INSTANCE_NEXT;
 591       }
 592    } else {
 593       data = nouveau_resource_map_offset(&nv50->base, buf,
 594                                          nv50->idxbuf.offset, NOUVEAU_BO_RD);
 595       if (!data)
 596          return;
 597
 598       while (instance_count--) {
 599          BEGIN_NV04(push, NV50_3D(VERTEX_BEGIN_GL), 1);
 600          PUSH_DATA (push, prim);
 601          switch (index_size) {
 602          case 1:
 603             nv50_draw_elements_inline_u08(push, data, start, count);
 604             break;
 605          case 2:
 606             nv50_draw_elements_inline_u16(push, data, start, count);
 607             break;
 608          case 4:
 609             if (shorten)
 610                nv50_draw_elements_inline_u32_short(push, data, start, count);
 611             else
 612                nv50_draw_elements_inline_u32(push, data, start, count);
 613             break;
 614          default:
 615             assert(0);
 616             return;
 617          }
 618          BEGIN_NV04(push, NV50_3D(VERTEX_END_GL), 1);
 619          PUSH_DATA (push, 0);
 620
 621          prim |= NV50_3D_VERTEX_BEGIN_GL_INSTANCE_NEXT;
 622       }
 623    }
 624 }
 625
 626 static void
 627 nv50_draw_vbo_kick_notify(struct nouveau_pushbuf *chan)
 628 {
 629    struct nv50_screen *screen = chan->user_priv;
 630
 631    nouveau_fence_update(&screen->base, TRUE);
 632
 633    nv50_bufctx_fence(screen->cur_ctx->bufctx_3d, TRUE);
 634 }
 635
 636 void
 637 nv50_draw_vbo(struct pipe_context *pipe, const struct pipe_draw_info *info)
 638 {
 639    struct nv50_context *nv50 = nv50_context(pipe);
 640    struct nouveau_pushbuf *push = nv50->base.pushbuf;
 641
 642    /* NOTE: caller must ensure that (min_index + index_bias) is >= 0 */
 643    nv50->vb_elt_first = info->min_index + info->index_bias;
 644    nv50->vb_elt_limit = info->max_index - info->min_index;
 645
 646    /* For picking only a few vertices from a large user buffer, push is better,
 647     * if index count is larger and we expect repeated vertices, suggest upload.
 648     */
 649    nv50->vbo_push_hint = /* the 64 is heuristic */
 650       !(info->indexed && ((nv50->vb_elt_limit + 64) < info->count));
 651
 652    if (nv50->vbo_push_hint != !!nv50->vbo_fifo)
 653       nv50->dirty |= NV50_NEW_ARRAYS;
 654
 655    if (nv50->vbo_user && !(nv50->dirty & (NV50_NEW_VERTEX | NV50_NEW_ARRAYS)))
 656       nv50_update_user_vbufs(nv50);
 657
 658    nv50_state_validate(nv50, ~0, 8); /* 8 as minimum, we use flush_notify */
 659
 660    push->kick_notify = nv50_draw_vbo_kick_notify;
 661
 662    if (nv50->vbo_fifo) {
 663       nv50_push_vbo(nv50, info);
 664       push->kick_notify = nv50_default_kick_notify;
 665       nouveau_pushbuf_bufctx(push, NULL);
 666       return;
 667    }
 668
 669    if (nv50->state.instance_base != info->start_instance) {
 670       nv50->state.instance_base = info->start_instance;
 671       /* NOTE: this does not affect the shader input, should it ? */
 672       BEGIN_NV04(push, NV50_3D(VB_INSTANCE_BASE), 1);
 673       PUSH_DATA (push, info->start_instance);
 674    }
 675
 676    if (nv50->base.vbo_dirty) {
 677       BEGIN_NV04(push, NV50_3D(VERTEX_ARRAY_FLUSH), 1);
 678       PUSH_DATA (push, 0);
 679       nv50->base.vbo_dirty = FALSE;
 680    }
 681
 682    if (!info->indexed) {
 683       nv50_draw_arrays(nv50,
 684                        info->mode, info->start, info->count,
 685                        info->instance_count);
 686    } else {
 687       boolean shorten = info->max_index <= 65535;
 688
 689       assert(nv50->idxbuf.buffer);
 690
 691       if (info->primitive_restart != nv50->state.prim_restart) {
 692          if (info->primitive_restart) {
 693             BEGIN_NV04(push, NV50_3D(PRIM_RESTART_ENABLE), 2);
 694             PUSH_DATA (push, 1);
 695             PUSH_DATA (push, info->restart_index);
 696
 697             if (info->restart_index > 65535)
 698                shorten = FALSE;
 699          } else {
 700             BEGIN_NV04(push, NV50_3D(PRIM_RESTART_ENABLE), 1);
 701             PUSH_DATA (push, 0);
 702          }
 703          nv50->state.prim_restart = info->primitive_restart;
 704       } else
 705       if (info->primitive_restart) {
 706          BEGIN_NV04(push, NV50_3D(PRIM_RESTART_INDEX), 1);
 707          PUSH_DATA (push, info->restart_index);
 708
 709          if (info->restart_index > 65535)
 710             shorten = FALSE;
 711       }
 712
 713       nv50_draw_elements(nv50, shorten,
 714                          info->mode, info->start, info->count,
 715                          info->instance_count, info->index_bias);
 716    }
 717    push->kick_notify = nv50_default_kick_notify;
 718
 719    nv50_release_user_vbufs(nv50);
 720
 721    nouveau_pushbuf_bufctx(push, NULL);
 722 }