src/gallium/drivers/r300/r300_render.c

   1 /*
   2  * Copyright 2009 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 /* r300_render: Vertex and index buffer primitive emission. Contains both
  24  * HW TCL fastpath rendering, and SW TCL Draw-assisted rendering. */
  25
  26 #include "draw/draw_context.h"
  27 #include "draw/draw_vbuf.h"
  28
  29 #include "util/u_inlines.h"
  30
  31 #include "util/u_format.h"
  32 #include "util/u_memory.h"
  33 #include "util/u_prim.h"
  34
  35 #include "r300_cs.h"
  36 #include "r300_context.h"
  37 #include "r300_emit.h"
  38 #include "r300_reg.h"
  39 #include "r300_render.h"
  40 #include "r300_state_derived.h"
  41
  42 /* r300_render: Vertex and index buffer primitive emission. */
  43 #define R300_MAX_VBO_SIZE  (1024 * 1024)
  44
  45 /* XXX The DRM rejects VAP_ALT_NUM_VERTICES.. */
  46 //#define ENABLE_ALT_NUM_VERTS
  47
  48 uint32_t r300_translate_primitive(unsigned prim)
  49 {
  50     switch (prim) {
  51         case PIPE_PRIM_POINTS:
  52             return R300_VAP_VF_CNTL__PRIM_POINTS;
  53         case PIPE_PRIM_LINES:
  54             return R300_VAP_VF_CNTL__PRIM_LINES;
  55         case PIPE_PRIM_LINE_LOOP:
  56             return R300_VAP_VF_CNTL__PRIM_LINE_LOOP;
  57         case PIPE_PRIM_LINE_STRIP:
  58             return R300_VAP_VF_CNTL__PRIM_LINE_STRIP;
  59         case PIPE_PRIM_TRIANGLES:
  60             return R300_VAP_VF_CNTL__PRIM_TRIANGLES;
  61         case PIPE_PRIM_TRIANGLE_STRIP:
  62             return R300_VAP_VF_CNTL__PRIM_TRIANGLE_STRIP;
  63         case PIPE_PRIM_TRIANGLE_FAN:
  64             return R300_VAP_VF_CNTL__PRIM_TRIANGLE_FAN;
  65         case PIPE_PRIM_QUADS:
  66             return R300_VAP_VF_CNTL__PRIM_QUADS;
  67         case PIPE_PRIM_QUAD_STRIP:
  68             return R300_VAP_VF_CNTL__PRIM_QUAD_STRIP;
  69         case PIPE_PRIM_POLYGON:
  70             return R300_VAP_VF_CNTL__PRIM_POLYGON;
  71         default:
  72             return 0;
  73     }
  74 }
  75
  76 static uint32_t r300_provoking_vertex_fixes(struct r300_context *r300,
  77                                             unsigned mode)
  78 {
  79     struct r300_rs_state* rs = (struct r300_rs_state*)r300->rs_state.state;
  80     uint32_t color_control = rs->color_control;
  81
  82     /* By default (see r300_state.c:r300_create_rs_state) color_control is
  83      * initialized to provoking the first vertex.
  84      *
  85      * Triangle fans must be reduced to the second vertex, not the first, in
  86      * Gallium flatshade-first mode, as per the GL spec.
  87      * (http://www.opengl.org/registry/specs/ARB/provoking_vertex.txt)
  88      *
  89      * Quads never provoke correctly in flatshade-first mode. The first
  90      * vertex is never considered as provoking, so only the second, third,
  91      * and fourth vertices can be selected, and both "third" and "last" modes
  92      * select the fourth vertex. This is probably due to D3D lacking quads.
  93      *
  94      * Similarly, polygons reduce to the first, not the last, vertex, when in
  95      * "last" mode, and all other modes start from the second vertex.
  96      *
  97      * ~ C.
  98      */
  99
 100     if (rs->rs.flatshade_first) {
 101         switch (mode) {
 102             case PIPE_PRIM_TRIANGLE_FAN:
 103                 color_control |= R300_GA_COLOR_CONTROL_PROVOKING_VERTEX_SECOND;
 104                 break;
 105             case PIPE_PRIM_QUADS:
 106             case PIPE_PRIM_QUAD_STRIP:
 107             case PIPE_PRIM_POLYGON:
 108                 color_control |= R300_GA_COLOR_CONTROL_PROVOKING_VERTEX_LAST;
 109                 break;
 110             default:
 111                 color_control |= R300_GA_COLOR_CONTROL_PROVOKING_VERTEX_FIRST;
 112                 break;
 113         }
 114     } else {
 115         color_control |= R300_GA_COLOR_CONTROL_PROVOKING_VERTEX_LAST;
 116     }
 117
 118     return color_control;
 119 }
 120
 121 /* Check if the requested number of dwords is available in the CS and
 122  * if not, flush. Return TRUE if the flush occured. */
 123 static boolean r300_reserve_cs_space(struct r300_context *r300,
 124                                      unsigned dwords)
 125 {
 126     if (!r300->winsys->check_cs(r300->winsys, dwords)) {
 127         r300->context.flush(&r300->context, 0, NULL);
 128         return TRUE;
 129     }
 130     return FALSE;
 131 }
 132
 133 static boolean immd_is_good_idea(struct r300_context *r300,
 134                                       unsigned count)
 135 {
 136     return count <= 4;
 137 }
 138
 139 static void r300_emit_draw_arrays_immediate(struct r300_context *r300,
 140                                             unsigned mode,
 141                                             unsigned start,
 142                                             unsigned count)
 143 {
 144     struct pipe_vertex_element* velem;
 145     struct pipe_vertex_buffer* vbuf;
 146     unsigned vertex_element_count = r300->vertex_element_count;
 147     unsigned i, v, vbi, dw, elem_offset, dwords;
 148
 149     /* Size of the vertex, in dwords. */
 150     unsigned vertex_size = 0;
 151
 152     /* Offsets of the attribute, in dwords, from the start of the vertex. */
 153     unsigned offset[PIPE_MAX_ATTRIBS];
 154
 155     /* Size of the vertex element, in dwords. */
 156     unsigned size[PIPE_MAX_ATTRIBS];
 157
 158     /* Stride to the same attrib in the next vertex in the vertex buffer,
 159      * in dwords. */
 160     unsigned stride[PIPE_MAX_ATTRIBS] = {0};
 161
 162     /* Mapped vertex buffers. */
 163     uint32_t* map[PIPE_MAX_ATTRIBS] = {0};
 164
 165     CS_LOCALS(r300);
 166
 167     /* Calculate the vertex size, offsets, strides etc. and map the buffers. */
 168     for (i = 0; i < vertex_element_count; i++) {
 169         velem = &r300->vertex_element[i];
 170         offset[i] = velem->src_offset / 4;
 171         size[i] = util_format_get_blocksize(velem->src_format) / 4;
 172         vertex_size += size[i];
 173         vbi = velem->vertex_buffer_index;
 174
 175         /* Map the buffer. */
 176         if (!map[vbi]) {
 177             vbuf = &r300->vertex_buffer[vbi];
 178             map[vbi] = (uint32_t*)pipe_buffer_map(r300->context.screen,
 179                                                   vbuf->buffer,
 180                                                   PIPE_BUFFER_USAGE_CPU_READ);
 181             map[vbi] += vbuf->buffer_offset / 4;
 182             stride[vbi] = vbuf->stride / 4;
 183         }
 184     }
 185
 186     dwords = 10 + count * vertex_size;
 187
 188     r300_reserve_cs_space(r300, r300_get_num_dirty_dwords(r300) + dwords);
 189     r300_emit_buffer_validate(r300, FALSE, 0);
 190     r300_emit_dirty_state(r300);
 191
 192     BEGIN_CS(dwords);
 193     OUT_CS_REG(R300_GA_COLOR_CONTROL,
 194             r300_provoking_vertex_fixes(r300, mode));
 195     OUT_CS_REG(R300_VAP_VTX_SIZE, vertex_size);
 196     OUT_CS_REG(R300_VAP_VF_MIN_VTX_INDX, 0);
 197     OUT_CS_REG(R300_VAP_VF_MAX_VTX_INDX, count - 1);
 198     OUT_CS_PKT3(R300_PACKET3_3D_DRAW_IMMD_2, count * vertex_size);
 199     OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_VERTEX_EMBEDDED | (count << 16) |
 200             r300_translate_primitive(mode));
 201
 202     /* Emit vertices. */
 203     for (v = 0; v < count; v++) {
 204         for (i = 0; i < vertex_element_count; i++) {
 205             velem = &r300->vertex_element[i];
 206             vbi = velem->vertex_buffer_index;
 207             elem_offset = offset[i] + stride[vbi] * (v + start);
 208
 209             for (dw = 0; dw < size[i]; dw++) {
 210                 OUT_CS(map[vbi][elem_offset + dw]);
 211             }
 212         }
 213     }
 214     END_CS;
 215
 216     /* Unmap buffers. */
 217     for (i = 0; i < vertex_element_count; i++) {
 218         vbi = r300->vertex_element[i].vertex_buffer_index;
 219
 220         if (map[vbi]) {
 221             vbuf = &r300->vertex_buffer[vbi];
 222             pipe_buffer_unmap(r300->context.screen, vbuf->buffer);
 223             map[vbi] = NULL;
 224         }
 225     }
 226 }
 227
 228 static void r300_emit_draw_arrays(struct r300_context *r300,
 229                                   unsigned mode,
 230                                   unsigned count)
 231 {
 232 #if defined(ENABLE_ALT_NUM_VERTS)
 233     boolean alt_num_verts = count > 65535;
 234 #else
 235     boolean alt_num_verts = FALSE;
 236 #endif
 237     CS_LOCALS(r300);
 238
 239     if (alt_num_verts) {
 240         assert(count < (1 << 24));
 241         BEGIN_CS(10);
 242         OUT_CS_REG(R500_VAP_ALT_NUM_VERTICES, count);
 243     } else {
 244         BEGIN_CS(8);
 245     }
 246     OUT_CS_REG(R300_GA_COLOR_CONTROL,
 247             r300_provoking_vertex_fixes(r300, mode));
 248     OUT_CS_REG(R300_VAP_VF_MIN_VTX_INDX, 0);
 249     OUT_CS_REG(R300_VAP_VF_MAX_VTX_INDX, count - 1);
 250     OUT_CS_PKT3(R300_PACKET3_3D_DRAW_VBUF_2, 0);
 251     OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_VERTEX_LIST | (count << 16) |
 252            r300_translate_primitive(mode) |
 253            (alt_num_verts ? R500_VAP_VF_CNTL__USE_ALT_NUM_VERTS : 0));
 254     END_CS;
 255 }
 256
 257 static void r300_emit_draw_elements(struct r300_context *r300,
 258                                     struct pipe_buffer* indexBuffer,
 259                                     unsigned indexSize,
 260                                     unsigned minIndex,
 261                                     unsigned maxIndex,
 262                                     unsigned mode,
 263                                     unsigned start,
 264                                     unsigned count)
 265 {
 266     uint32_t count_dwords;
 267     uint32_t offset_dwords = indexSize * start / sizeof(uint32_t);
 268 #if defined(ENABLE_ALT_NUM_VERTS)
 269     boolean alt_num_verts = count > 65535;
 270 #else
 271     boolean alt_num_verts = FALSE;
 272 #endif
 273     CS_LOCALS(r300);
 274
 275     assert((start * indexSize)  % 4 == 0);
 276
 277     if (alt_num_verts) {
 278         assert(count < (1 << 24));
 279         BEGIN_CS(16);
 280         OUT_CS_REG(R500_VAP_ALT_NUM_VERTICES, count);
 281     } else {
 282         BEGIN_CS(14);
 283     }
 284     OUT_CS_REG(R300_GA_COLOR_CONTROL,
 285             r300_provoking_vertex_fixes(r300, mode));
 286     OUT_CS_REG(R300_VAP_VF_MIN_VTX_INDX, minIndex);
 287     OUT_CS_REG(R300_VAP_VF_MAX_VTX_INDX, maxIndex);
 288     OUT_CS_PKT3(R300_PACKET3_3D_DRAW_INDX_2, 0);
 289     if (indexSize == 4) {
 290         count_dwords = count;
 291         OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_INDICES | (count << 16) |
 292                R300_VAP_VF_CNTL__INDEX_SIZE_32bit |
 293                r300_translate_primitive(mode) |
 294                (alt_num_verts ? R500_VAP_VF_CNTL__USE_ALT_NUM_VERTS : 0));
 295     } else {
 296         count_dwords = (count + 1) / 2;
 297         OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_INDICES | (count << 16) |
 298                r300_translate_primitive(mode) |
 299                (alt_num_verts ? R500_VAP_VF_CNTL__USE_ALT_NUM_VERTS : 0));
 300     }
 301
 302     /* INDX_BUFFER is a truly special packet3.
 303      * Unlike most other packet3, where the offset is after the count,
 304      * the order is reversed, so the relocation ends up carrying the
 305      * size of the indexbuf instead of the offset.
 306      */
 307     OUT_CS_PKT3(R300_PACKET3_INDX_BUFFER, 2);
 308     OUT_CS(R300_INDX_BUFFER_ONE_REG_WR | (R300_VAP_PORT_IDX0 >> 2) |
 309            (0 << R300_INDX_BUFFER_SKIP_SHIFT));
 310     OUT_CS(offset_dwords << 2);
 311     OUT_CS_RELOC(indexBuffer, count_dwords,
 312         RADEON_GEM_DOMAIN_GTT, 0, 0);
 313
 314     END_CS;
 315 }
 316
 317 static void r300_shorten_ubyte_elts(struct r300_context* r300,
 318                                     struct pipe_buffer** elts,
 319                                     unsigned count)
 320 {
 321     struct pipe_screen* screen = r300->context.screen;
 322     struct pipe_buffer* new_elts;
 323     unsigned char *in_map;
 324     unsigned short *out_map;
 325     unsigned i;
 326
 327     new_elts = screen->buffer_create(screen, 32,
 328                                      PIPE_BUFFER_USAGE_INDEX |
 329                                      PIPE_BUFFER_USAGE_CPU_WRITE |
 330                                      PIPE_BUFFER_USAGE_GPU_READ,
 331                                      2 * count);
 332
 333     in_map = pipe_buffer_map(screen, *elts, PIPE_BUFFER_USAGE_CPU_READ);
 334     out_map = pipe_buffer_map(screen, new_elts, PIPE_BUFFER_USAGE_CPU_WRITE);
 335
 336     for (i = 0; i < count; i++) {
 337         *out_map = (unsigned short)*in_map;
 338         in_map++;
 339         out_map++;
 340     }
 341
 342     pipe_buffer_unmap(screen, *elts);
 343     pipe_buffer_unmap(screen, new_elts);
 344
 345     *elts = new_elts;
 346 }
 347
 348 /* This is the fast-path drawing & emission for HW TCL. */
 349 void r300_draw_range_elements(struct pipe_context* pipe,
 350                               struct pipe_buffer* indexBuffer,
 351                               unsigned indexSize,
 352                               unsigned minIndex,
 353                               unsigned maxIndex,
 354                               unsigned mode,
 355                               unsigned start,
 356                               unsigned count)
 357 {
 358     struct r300_context* r300 = r300_context(pipe);
 359     struct pipe_buffer* orgIndexBuffer = indexBuffer;
 360 #if defined(ENABLE_ALT_NUM_VERTS)
 361     boolean alt_num_verts = r300_screen(pipe->screen)->caps->is_r500 &&
 362                             count > 65536;
 363 #else
 364     boolean alt_num_verts = FALSE;
 365 #endif
 366     unsigned short_count;
 367
 368     if (!u_trim_pipe_prim(mode, &count)) {
 369         return;
 370     }
 371
 372     if (indexSize == 1) {
 373         r300_shorten_ubyte_elts(r300, &indexBuffer, count);
 374         indexSize = 2;
 375     }
 376
 377     r300_update_derived_state(r300);
 378
 379     /* 128 dwords for emit_aos and emit_draw_elements */
 380     r300_reserve_cs_space(r300, r300_get_num_dirty_dwords(r300) + 128);
 381     r300_emit_buffer_validate(r300, TRUE, indexBuffer);
 382     r300_emit_dirty_state(r300);
 383     r300_emit_aos(r300, 0);
 384
 385     if (alt_num_verts || count <= 65535) {
 386         r300_emit_draw_elements(r300, indexBuffer, indexSize, minIndex,
 387                                 maxIndex, mode, start, count);
 388     } else {
 389         do {
 390             short_count = MIN2(count, 65534);
 391             r300_emit_draw_elements(r300, indexBuffer, indexSize, minIndex,
 392                                     maxIndex, mode, start, short_count);
 393
 394             start += short_count;
 395             count -= short_count;
 396
 397             /* 16 spare dwords are enough for emit_draw_elements. */
 398             if (count && r300_reserve_cs_space(r300, 16)) {
 399                 r300_emit_buffer_validate(r300, TRUE, indexBuffer);
 400                 r300_emit_dirty_state(r300);
 401                 r300_emit_aos(r300, 0);
 402             }
 403         } while (count);
 404     }
 405
 406     if (indexBuffer != orgIndexBuffer) {
 407         pipe->screen->buffer_destroy(indexBuffer);
 408     }
 409 }
 410
 411 /* Simple helpers for context setup. Should probably be moved to util. */
 412 void r300_draw_elements(struct pipe_context* pipe,
 413                         struct pipe_buffer* indexBuffer,
 414                         unsigned indexSize, unsigned mode,
 415                         unsigned start, unsigned count)
 416 {
 417     struct r300_context *r300 = r300_context(pipe);
 418
 419     pipe->draw_range_elements(pipe, indexBuffer, indexSize, 0,
 420                               r300->vertex_buffer_max_index,
 421                               mode, start, count);
 422 }
 423
 424 void r300_draw_arrays(struct pipe_context* pipe, unsigned mode,
 425                       unsigned start, unsigned count)
 426 {
 427     struct r300_context* r300 = r300_context(pipe);
 428 #if defined(ENABLE_ALT_NUM_VERTS)
 429     boolean alt_num_verts = r300_screen(pipe->screen)->caps->is_r500 &&
 430                             count > 65536;
 431 #else
 432     boolean alt_num_verts = FALSE;
 433 #endif
 434     unsigned short_count;
 435
 436     if (!u_trim_pipe_prim(mode, &count)) {
 437         return;
 438     }
 439
 440     r300_update_derived_state(r300);
 441
 442     if (immd_is_good_idea(r300, count)) {
 443         r300_emit_draw_arrays_immediate(r300, mode, start, count);
 444     } else {
 445         /* Make sure there are at least 128 spare dwords in the command buffer.
 446          * (most of it being consumed by emit_aos) */
 447         r300_reserve_cs_space(r300, r300_get_num_dirty_dwords(r300) + 128);
 448         r300_emit_buffer_validate(r300, TRUE, 0);
 449         r300_emit_dirty_state(r300);
 450
 451         if (alt_num_verts || count <= 65535) {
 452             r300_emit_aos(r300, start);
 453             r300_emit_draw_arrays(r300, mode, count);
 454         } else {
 455             do {
 456                 short_count = MIN2(count, 65535);
 457                 r300_emit_aos(r300, start);
 458                 r300_emit_draw_arrays(r300, mode, short_count);
 459
 460                 start += short_count;
 461                 count -= short_count;
 462
 463                 /* Again, we emit both AOS and draw_arrays so there should be
 464                  * at least 128 spare dwords. */
 465                 if (count && r300_reserve_cs_space(r300, 128)) {
 466                     r300_emit_buffer_validate(r300, TRUE, 0);
 467                     r300_emit_dirty_state(r300);
 468                 }
 469             } while (count);
 470         }
 471     }
 472 }
 473
 474 /****************************************************************************
 475  * The rest of this file is for SW TCL rendering only. Please be polite and *
 476  * keep these functions separated so that they are easier to locate. ~C.    *
 477  ***************************************************************************/
 478
 479 /* SW TCL arrays, using Draw. */
 480 void r300_swtcl_draw_arrays(struct pipe_context* pipe,
 481                                unsigned mode,
 482                                unsigned start,
 483                                unsigned count)
 484 {
 485     struct r300_context* r300 = r300_context(pipe);
 486     int i;
 487
 488     if (!u_trim_pipe_prim(mode, &count)) {
 489         return;
 490     }
 491
 492     for (i = 0; i < r300->vertex_buffer_count; i++) {
 493         void* buf = pipe_buffer_map(pipe->screen,
 494                                     r300->vertex_buffer[i].buffer,
 495                                     PIPE_BUFFER_USAGE_CPU_READ);
 496         draw_set_mapped_vertex_buffer(r300->draw, i, buf);
 497     }
 498
 499     draw_set_mapped_element_buffer(r300->draw, 0, NULL);
 500
 501     draw_set_mapped_constant_buffer(r300->draw,
 502                                     PIPE_SHADER_VERTEX,
 503                                     0,
 504                                     r300->shader_constants[PIPE_SHADER_VERTEX].constants,
 505                                     r300->shader_constants[PIPE_SHADER_VERTEX].count *
 506                 (sizeof(float) * 4));
 507
 508     draw_arrays(r300->draw, mode, start, count);
 509
 510     for (i = 0; i < r300->vertex_buffer_count; i++) {
 511         pipe_buffer_unmap(pipe->screen, r300->vertex_buffer[i].buffer);
 512         draw_set_mapped_vertex_buffer(r300->draw, i, NULL);
 513     }
 514 }
 515
 516 /* SW TCL elements, using Draw. */
 517 void r300_swtcl_draw_range_elements(struct pipe_context* pipe,
 518                                        struct pipe_buffer* indexBuffer,
 519                                        unsigned indexSize,
 520                                        unsigned minIndex,
 521                                        unsigned maxIndex,
 522                                        unsigned mode,
 523                                        unsigned start,
 524                                        unsigned count)
 525 {
 526     struct r300_context* r300 = r300_context(pipe);
 527     int i;
 528     void* indices;
 529
 530     if (!u_trim_pipe_prim(mode, &count)) {
 531         return;
 532     }
 533
 534     for (i = 0; i < r300->vertex_buffer_count; i++) {
 535         void* buf = pipe_buffer_map(pipe->screen,
 536                                     r300->vertex_buffer[i].buffer,
 537                                     PIPE_BUFFER_USAGE_CPU_READ);
 538         draw_set_mapped_vertex_buffer(r300->draw, i, buf);
 539     }
 540
 541     indices = pipe_buffer_map(pipe->screen, indexBuffer,
 542                               PIPE_BUFFER_USAGE_CPU_READ);
 543     draw_set_mapped_element_buffer_range(r300->draw, indexSize,
 544                                          minIndex, maxIndex, indices);
 545
 546     draw_set_mapped_constant_buffer(r300->draw,
 547                                     PIPE_SHADER_VERTEX,
 548                                     0,
 549             r300->shader_constants[PIPE_SHADER_VERTEX].constants,
 550             r300->shader_constants[PIPE_SHADER_VERTEX].count *
 551                 (sizeof(float) * 4));
 552
 553     draw_arrays(r300->draw, mode, start, count);
 554
 555     for (i = 0; i < r300->vertex_buffer_count; i++) {
 556         pipe_buffer_unmap(pipe->screen, r300->vertex_buffer[i].buffer);
 557         draw_set_mapped_vertex_buffer(r300->draw, i, NULL);
 558     }
 559
 560     pipe_buffer_unmap(pipe->screen, indexBuffer);
 561     draw_set_mapped_element_buffer_range(r300->draw, 0, start,
 562                                          start + count - 1, NULL);
 563 }
 564
 565 /* Object for rendering using Draw. */
 566 struct r300_render {
 567     /* Parent class */
 568     struct vbuf_render base;
 569
 570     /* Pipe context */
 571     struct r300_context* r300;
 572
 573     /* Vertex information */
 574     size_t vertex_size;
 575     unsigned prim;
 576     unsigned hwprim;
 577
 578     /* VBO */
 579     struct pipe_buffer* vbo;
 580     size_t vbo_size;
 581     size_t vbo_offset;
 582     size_t vbo_max_used;
 583     void * vbo_ptr;
 584 };
 585
 586 static INLINE struct r300_render*
 587 r300_render(struct vbuf_render* render)
 588 {
 589     return (struct r300_render*)render;
 590 }
 591
 592 static const struct vertex_info*
 593 r300_render_get_vertex_info(struct vbuf_render* render)
 594 {
 595     struct r300_render* r300render = r300_render(render);
 596     struct r300_context* r300 = r300render->r300;
 597
 598     r300_update_derived_state(r300);
 599
 600     return &r300->vertex_info;
 601 }
 602
 603 static boolean r300_render_allocate_vertices(struct vbuf_render* render,
 604                                                    ushort vertex_size,
 605                                                    ushort count)
 606 {
 607     struct r300_render* r300render = r300_render(render);
 608     struct r300_context* r300 = r300render->r300;
 609     struct pipe_screen* screen = r300->context.screen;
 610     size_t size = (size_t)vertex_size * (size_t)count;
 611
 612     if (size + r300render->vbo_offset > r300render->vbo_size)
 613     {
 614         pipe_buffer_reference(&r300->vbo, NULL);
 615         r300render->vbo = pipe_buffer_create(screen,
 616                                              64,
 617                                              PIPE_BUFFER_USAGE_VERTEX,
 618                                              R300_MAX_VBO_SIZE);
 619         r300render->vbo_offset = 0;
 620         r300render->vbo_size = R300_MAX_VBO_SIZE;
 621     }
 622
 623     r300render->vertex_size = vertex_size;
 624     r300->vbo = r300render->vbo;
 625     r300->vbo_offset = r300render->vbo_offset;
 626
 627     return (r300render->vbo) ? TRUE : FALSE;
 628 }
 629
 630 static void* r300_render_map_vertices(struct vbuf_render* render)
 631 {
 632     struct r300_render* r300render = r300_render(render);
 633     struct pipe_screen* screen = r300render->r300->context.screen;
 634
 635     r300render->vbo_ptr = pipe_buffer_map(screen, r300render->vbo,
 636                                           PIPE_BUFFER_USAGE_CPU_WRITE);
 637
 638     return ((uint8_t*)r300render->vbo_ptr + r300render->vbo_offset);
 639 }
 640
 641 static void r300_render_unmap_vertices(struct vbuf_render* render,
 642                                              ushort min,
 643                                              ushort max)
 644 {
 645     struct r300_render* r300render = r300_render(render);
 646     struct pipe_screen* screen = r300render->r300->context.screen;
 647     CS_LOCALS(r300render->r300);
 648     BEGIN_CS(2);
 649     OUT_CS_REG(R300_VAP_VF_MAX_VTX_INDX, max);
 650     END_CS;
 651
 652     r300render->vbo_max_used = MAX2(r300render->vbo_max_used,
 653                                     r300render->vertex_size * (max + 1));
 654     pipe_buffer_unmap(screen, r300render->vbo);
 655 }
 656
 657 static void r300_render_release_vertices(struct vbuf_render* render)
 658 {
 659     struct r300_render* r300render = r300_render(render);
 660
 661     r300render->vbo_offset += r300render->vbo_max_used;
 662     r300render->vbo_max_used = 0;
 663 }
 664
 665 static boolean r300_render_set_primitive(struct vbuf_render* render,
 666                                                unsigned prim)
 667 {
 668     struct r300_render* r300render = r300_render(render);
 669
 670     r300render->prim = prim;
 671     r300render->hwprim = r300_translate_primitive(prim);
 672
 673     return TRUE;
 674 }
 675
 676 static void r300_render_draw_arrays(struct vbuf_render* render,
 677                                           unsigned start,
 678                                           unsigned count)
 679 {
 680     struct r300_render* r300render = r300_render(render);
 681     struct r300_context* r300 = r300render->r300;
 682
 683     CS_LOCALS(r300);
 684
 685     r300_reserve_cs_space(r300, r300_get_num_dirty_dwords(r300) + 2);
 686     r300_emit_dirty_state(r300);
 687
 688     DBG(r300, DBG_DRAW, "r300: Doing vbuf render, count %d\n", count);
 689
 690     BEGIN_CS(2);
 691     OUT_CS_PKT3(R300_PACKET3_3D_DRAW_VBUF_2, 0);
 692     OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_VERTEX_LIST | (count << 16) |
 693            r300render->hwprim);
 694     END_CS;
 695 }
 696
 697 static void r300_render_draw(struct vbuf_render* render,
 698                                    const ushort* indices,
 699                                    uint count)
 700 {
 701     struct r300_render* r300render = r300_render(render);
 702     struct r300_context* r300 = r300render->r300;
 703     int i;
 704     unsigned dwords = 2 + (count+1)/2;
 705
 706     CS_LOCALS(r300);
 707
 708     r300_reserve_cs_space(r300, r300_get_num_dirty_dwords(r300) + dwords);
 709     r300_emit_dirty_state(r300);
 710
 711     BEGIN_CS(dwords);
 712     OUT_CS_PKT3(R300_PACKET3_3D_DRAW_INDX_2, (count+1)/2);
 713     OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_INDICES | (count << 16) |
 714            r300render->hwprim);
 715     for (i = 0; i < count-1; i += 2) {
 716         OUT_CS(indices[i+1] << 16 | indices[i]);
 717     }
 718     if (count % 2) {
 719         OUT_CS(indices[count-1]);
 720     }
 721     END_CS;
 722 }
 723
 724 static void r300_render_destroy(struct vbuf_render* render)
 725 {
 726     FREE(render);
 727 }
 728
 729 static struct vbuf_render* r300_render_create(struct r300_context* r300)
 730 {
 731     struct r300_render* r300render = CALLOC_STRUCT(r300_render);
 732
 733     r300render->r300 = r300;
 734
 735     /* XXX find real numbers plz */
 736     r300render->base.max_vertex_buffer_bytes = 128 * 1024;
 737     r300render->base.max_indices = 16 * 1024;
 738
 739     r300render->base.get_vertex_info = r300_render_get_vertex_info;
 740     r300render->base.allocate_vertices = r300_render_allocate_vertices;
 741     r300render->base.map_vertices = r300_render_map_vertices;
 742     r300render->base.unmap_vertices = r300_render_unmap_vertices;
 743     r300render->base.set_primitive = r300_render_set_primitive;
 744     r300render->base.draw = r300_render_draw;
 745     r300render->base.draw_arrays = r300_render_draw_arrays;
 746     r300render->base.release_vertices = r300_render_release_vertices;
 747     r300render->base.destroy = r300_render_destroy;
 748
 749     r300render->vbo = NULL;
 750     r300render->vbo_size = 0;
 751     r300render->vbo_offset = 0;
 752
 753     return &r300render->base;
 754 }
 755
 756 struct draw_stage* r300_draw_stage(struct r300_context* r300)
 757 {
 758     struct vbuf_render* render;
 759     struct draw_stage* stage;
 760
 761     render = r300_render_create(r300);
 762
 763     if (!render) {
 764         return NULL;
 765     }
 766
 767     stage = draw_vbuf_stage(r300->draw, render);
 768
 769     if (!stage) {
 770         render->destroy(render);
 771         return NULL;
 772     }
 773
 774     draw_set_render(r300->draw, render);
 775
 776     return stage;
 777 }