src/gallium/auxiliary/draw/draw_pt.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28  /*
  29   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   */
  32
  33 #include "draw/draw_context.h"
  34 #include "draw/draw_gs.h"
  35 #include "draw/draw_private.h"
  36 #include "draw/draw_pt.h"
  37 #include "draw/draw_vs.h"
  38 #include "tgsi/tgsi_dump.h"
  39 #include "util/u_math.h"
  40 #include "util/u_prim.h"
  41 #include "util/u_format.h"
  42 #include "util/u_draw.h"
  43
  44
  45 DEBUG_GET_ONCE_BOOL_OPTION(draw_fse, "DRAW_FSE", FALSE)
  46 DEBUG_GET_ONCE_BOOL_OPTION(draw_no_fse, "DRAW_NO_FSE", FALSE)
  47
  48 /* Overall we split things into:
  49  *     - frontend -- prepare fetch_elts, draw_elts - eg vsplit
  50  *     - middle   -- fetch, shade, cliptest, viewport
  51  *     - pipeline -- the prim pipeline: clipping, wide lines, etc
  52  *     - backend  -- the vbuf_render provided by the driver.
  53  */
  54 static boolean
  55 draw_pt_arrays(struct draw_context *draw,
  56                unsigned prim,
  57                unsigned start,
  58                unsigned count)
  59 {
  60    struct draw_pt_front_end *frontend = NULL;
  61    struct draw_pt_middle_end *middle = NULL;
  62    unsigned opt = 0;
  63
  64    /* Sanitize primitive length:
  65     */
  66    {
  67       unsigned first, incr;
  68       draw_pt_split_prim(prim, &first, &incr);
  69       count = draw_pt_trim_count(count, first, incr);
  70       if (count < first)
  71          return TRUE;
  72    }
  73
  74    if (!draw->force_passthrough) {
  75       unsigned gs_out_prim = (draw->gs.geometry_shader ?
  76                               draw->gs.geometry_shader->output_primitive :
  77                               prim);
  78
  79       if (!draw->render) {
  80          opt |= PT_PIPELINE;
  81       }
  82
  83       if (draw_need_pipeline(draw,
  84                              draw->rasterizer,
  85                              gs_out_prim)) {
  86          opt |= PT_PIPELINE;
  87       }
  88
  89       if ((draw->clip_xy ||
  90            draw->clip_z ||
  91            draw->clip_user) && !draw->pt.test_fse) {
  92          opt |= PT_CLIPTEST;
  93       }
  94
  95       opt |= PT_SHADE;
  96    }
  97
  98    if (draw->pt.middle.llvm) {
  99       middle = draw->pt.middle.llvm;
 100    } else {
 101       if (opt == 0)
 102          middle = draw->pt.middle.fetch_emit;
 103       else if (opt == PT_SHADE && !draw->pt.no_fse)
 104          middle = draw->pt.middle.fetch_shade_emit;
 105       else
 106          middle = draw->pt.middle.general;
 107    }
 108
 109    frontend = draw->pt.frontend;
 110
 111    if (frontend ) {
 112       if (draw->pt.prim != prim || draw->pt.opt != opt) {
 113          /* In certain conditions switching primitives requires us to flush
 114           * and validate the different stages. One example is when smooth
 115           * lines are active but first drawn with triangles and then with
 116           * lines.
 117           */
 118          draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 119          frontend = NULL;
 120       } else if (draw->pt.eltSize != draw->pt.user.eltSize) {
 121          /* Flush draw state if eltSize changed.
 122           * This could be improved so only the frontend is flushed since it
 123           * converts all indices to ushorts and the fetch part of the middle
 124           * always perpares both linear and indexed.
 125           */
 126          frontend->flush( frontend, DRAW_FLUSH_STATE_CHANGE );
 127          frontend = NULL;
 128       }
 129    }
 130
 131    if (!frontend) {
 132       frontend = draw->pt.front.vsplit;
 133
 134       frontend->prepare( frontend, prim, middle, opt );
 135
 136       draw->pt.frontend = frontend;
 137       draw->pt.eltSize = draw->pt.user.eltSize;
 138       draw->pt.prim = prim;
 139       draw->pt.opt = opt;
 140    }
 141
 142    frontend->run( frontend, start, count );
 143
 144    return TRUE;
 145 }
 146
 147 void draw_pt_flush( struct draw_context *draw, unsigned flags )
 148 {
 149    if (draw->pt.frontend) {
 150       draw->pt.frontend->flush( draw->pt.frontend, flags );
 151
 152       /* don't prepare if we only are flushing the backend */
 153       if (!(flags & DRAW_FLUSH_BACKEND))
 154          draw->pt.frontend = NULL;
 155    }
 156 }
 157
 158
 159
 160 boolean draw_pt_init( struct draw_context *draw )
 161 {
 162    draw->pt.test_fse = debug_get_option_draw_fse();
 163    draw->pt.no_fse = debug_get_option_draw_no_fse();
 164
 165    draw->pt.front.vsplit = draw_pt_vsplit(draw);
 166    if (!draw->pt.front.vsplit)
 167       return FALSE;
 168
 169    draw->pt.middle.fetch_emit = draw_pt_fetch_emit( draw );
 170    if (!draw->pt.middle.fetch_emit)
 171       return FALSE;
 172
 173    draw->pt.middle.fetch_shade_emit = draw_pt_middle_fse( draw );
 174    if (!draw->pt.middle.fetch_shade_emit)
 175       return FALSE;
 176
 177    draw->pt.middle.general = draw_pt_fetch_pipeline_or_emit( draw );
 178    if (!draw->pt.middle.general)
 179       return FALSE;
 180
 181 #if HAVE_LLVM
 182    if (draw->llvm)
 183       draw->pt.middle.llvm = draw_pt_fetch_pipeline_or_emit_llvm( draw );
 184 #endif
 185
 186    return TRUE;
 187 }
 188
 189
 190 void draw_pt_destroy( struct draw_context *draw )
 191 {
 192    if (draw->pt.middle.llvm) {
 193       draw->pt.middle.llvm->destroy( draw->pt.middle.llvm );
 194       draw->pt.middle.llvm = NULL;
 195    }
 196
 197    if (draw->pt.middle.general) {
 198       draw->pt.middle.general->destroy( draw->pt.middle.general );
 199       draw->pt.middle.general = NULL;
 200    }
 201
 202    if (draw->pt.middle.fetch_emit) {
 203       draw->pt.middle.fetch_emit->destroy( draw->pt.middle.fetch_emit );
 204       draw->pt.middle.fetch_emit = NULL;
 205    }
 206
 207    if (draw->pt.middle.fetch_shade_emit) {
 208       draw->pt.middle.fetch_shade_emit->destroy( draw->pt.middle.fetch_shade_emit );
 209       draw->pt.middle.fetch_shade_emit = NULL;
 210    }
 211
 212    if (draw->pt.front.vsplit) {
 213       draw->pt.front.vsplit->destroy( draw->pt.front.vsplit );
 214       draw->pt.front.vsplit = NULL;
 215    }
 216 }
 217
 218
 219 /**
 220  * Debug- print the first 'count' vertices.
 221  */
 222 static void
 223 draw_print_arrays(struct draw_context *draw, uint prim, int start, uint count)
 224 {
 225    uint i;
 226
 227    debug_printf("Draw arrays(prim = %u, start = %u, count = %u)\n",
 228                 prim, start, count);
 229
 230    for (i = 0; i < count; i++) {
 231       uint ii = 0;
 232       uint j;
 233
 234       if (draw->pt.user.eltSize) {
 235          const char *elts;
 236
 237          /* indexed arrays */
 238          elts = (const char *) draw->pt.user.elts;
 239          elts += draw->pt.index_buffer.offset;
 240
 241          switch (draw->pt.user.eltSize) {
 242          case 1:
 243             {
 244                const ubyte *elem = (const ubyte *) elts;
 245                ii = elem[start + i];
 246             }
 247             break;
 248          case 2:
 249             {
 250                const ushort *elem = (const ushort *) elts;
 251                ii = elem[start + i];
 252             }
 253             break;
 254          case 4:
 255             {
 256                const uint *elem = (const uint *) elts;
 257                ii = elem[start + i];
 258             }
 259             break;
 260          default:
 261             assert(0);
 262             return;
 263          }
 264          ii += draw->pt.user.eltBias;
 265          debug_printf("Element[%u + %u] + %i -> Vertex %u:\n", start, i,
 266                       draw->pt.user.eltBias, ii);
 267       }
 268       else {
 269          /* non-indexed arrays */
 270          ii = start + i;
 271          debug_printf("Vertex %u:\n", ii);
 272       }
 273
 274       for (j = 0; j < draw->pt.nr_vertex_elements; j++) {
 275          uint buf = draw->pt.vertex_element[j].vertex_buffer_index;
 276          ubyte *ptr = (ubyte *) draw->pt.user.vbuffer[buf];
 277
 278          if (draw->pt.vertex_element[j].instance_divisor) {
 279             ii = draw->instance_id / draw->pt.vertex_element[j].instance_divisor;
 280          }
 281
 282          ptr += draw->pt.vertex_buffer[buf].buffer_offset;
 283          ptr += draw->pt.vertex_buffer[buf].stride * ii;
 284          ptr += draw->pt.vertex_element[j].src_offset;
 285
 286          debug_printf("  Attr %u: ", j);
 287          switch (draw->pt.vertex_element[j].src_format) {
 288          case PIPE_FORMAT_R32_FLOAT:
 289             {
 290                float *v = (float *) ptr;
 291                debug_printf("R %f  @ %p\n", v[0], (void *) v);
 292             }
 293             break;
 294          case PIPE_FORMAT_R32G32_FLOAT:
 295             {
 296                float *v = (float *) ptr;
 297                debug_printf("RG %f %f  @ %p\n", v[0], v[1], (void *) v);
 298             }
 299             break;
 300          case PIPE_FORMAT_R32G32B32_FLOAT:
 301             {
 302                float *v = (float *) ptr;
 303                debug_printf("RGB %f %f %f  @ %p\n", v[0], v[1], v[2], (void *) v);
 304             }
 305             break;
 306          case PIPE_FORMAT_R32G32B32A32_FLOAT:
 307             {
 308                float *v = (float *) ptr;
 309                debug_printf("RGBA %f %f %f %f  @ %p\n", v[0], v[1], v[2], v[3],
 310                             (void *) v);
 311             }
 312             break;
 313          case PIPE_FORMAT_B8G8R8A8_UNORM:
 314             {
 315                ubyte *u = (ubyte *) ptr;
 316                debug_printf("BGRA %d %d %d %d  @ %p\n", u[0], u[1], u[2], u[3],
 317                             (void *) u);
 318             }
 319             break;
 320          default:
 321             debug_printf("other format %s (fix me)\n",
 322                      util_format_name(draw->pt.vertex_element[j].src_format));
 323          }
 324       }
 325    }
 326 }
 327
 328
 329 /** Helper code for below */
 330 #define PRIM_RESTART_LOOP(elements) \
 331    do { \
 332       for (i = start; i < end; i++) { \
 333          if (elements[i] == info->restart_index) { \
 334             if (cur_count > 0) { \
 335                /* draw elts up to prev pos */ \
 336                draw_pt_arrays(draw, prim, cur_start, cur_count); \
 337             } \
 338             /* begin new prim at next elt */ \
 339             cur_start = i + 1; \
 340             cur_count = 0; \
 341          } \
 342          else { \
 343             cur_count++; \
 344          } \
 345       } \
 346       if (cur_count > 0) { \
 347          draw_pt_arrays(draw, prim, cur_start, cur_count); \
 348       } \
 349    } while (0)
 350
 351
 352 /**
 353  * For drawing prims with primitive restart enabled.
 354  * Scan for restart indexes and draw the runs of elements/vertices between
 355  * the restarts.
 356  */
 357 static void
 358 draw_pt_arrays_restart(struct draw_context *draw,
 359                        const struct pipe_draw_info *info)
 360 {
 361    const unsigned prim = info->mode;
 362    const unsigned start = info->start;
 363    const unsigned count = info->count;
 364    const unsigned end = start + count;
 365    unsigned i, cur_start, cur_count;
 366
 367    assert(info->primitive_restart);
 368
 369    if (draw->pt.user.elts) {
 370       /* indexed prims (draw_elements) */
 371       cur_start = start;
 372       cur_count = 0;
 373
 374       switch (draw->pt.user.eltSize) {
 375       case 1:
 376          {
 377             const ubyte *elt_ub = (const ubyte *) draw->pt.user.elts;
 378             PRIM_RESTART_LOOP(elt_ub);
 379          }
 380          break;
 381       case 2:
 382          {
 383             const ushort *elt_us = (const ushort *) draw->pt.user.elts;
 384             PRIM_RESTART_LOOP(elt_us);
 385          }
 386          break;
 387       case 4:
 388          {
 389             const uint *elt_ui = (const uint *) draw->pt.user.elts;
 390             PRIM_RESTART_LOOP(elt_ui);
 391          }
 392          break;
 393       default:
 394          assert(0 && "bad eltSize in draw_arrays()");
 395       }
 396    }
 397    else {
 398       /* Non-indexed prims (draw_arrays).
 399        * Primitive restart should have been handled in the state tracker.
 400        */
 401       draw_pt_arrays(draw, prim, start, count);
 402    }
 403 }
 404
 405
 406
 407 /**
 408  * Non-instanced drawing.
 409  * \sa draw_arrays_instanced
 410  */
 411 void
 412 draw_arrays(struct draw_context *draw, unsigned prim,
 413             unsigned start, unsigned count)
 414 {
 415    draw_arrays_instanced(draw, prim, start, count, 0, 1);
 416 }
 417
 418
 419 /**
 420  * Instanced drawing.
 421  * \sa draw_vbo
 422  */
 423 void
 424 draw_arrays_instanced(struct draw_context *draw,
 425                       unsigned mode,
 426                       unsigned start,
 427                       unsigned count,
 428                       unsigned startInstance,
 429                       unsigned instanceCount)
 430 {
 431    struct pipe_draw_info info;
 432
 433    util_draw_init_info(&info);
 434
 435    info.mode = mode;
 436    info.start = start;
 437    info.count = count;
 438    info.start_instance = startInstance;
 439    info.instance_count = instanceCount;
 440
 441    info.indexed = (draw->pt.user.elts != NULL);
 442    if (!info.indexed) {
 443       info.min_index = start;
 444       info.max_index = start + count - 1;
 445    }
 446
 447    draw_vbo(draw, &info);
 448 }
 449
 450
 451 /**
 452  * Draw vertex arrays.
 453  * This is the main entrypoint into the drawing module.  If drawing an indexed
 454  * primitive, the draw_set_index_buffer() and draw_set_mapped_index_buffer()
 455  * functions should have already been called to specify the element/index
 456  * buffer information.
 457  */
 458 void
 459 draw_vbo(struct draw_context *draw,
 460          const struct pipe_draw_info *info)
 461 {
 462    unsigned instance;
 463    unsigned index_limit;
 464
 465    assert(info->instance_count > 0);
 466    if (info->indexed)
 467       assert(draw->pt.user.elts);
 468
 469    draw->pt.user.eltSize =
 470       (info->indexed) ? draw->pt.index_buffer.index_size : 0;
 471
 472    draw->pt.user.eltBias = info->index_bias;
 473    draw->pt.user.min_index = info->min_index;
 474    draw->pt.user.max_index = info->max_index;
 475
 476    if (0)
 477       debug_printf("draw_vbo(mode=%u start=%u count=%u):\n",
 478                    info->mode, info->start, info->count);
 479
 480    if (0)
 481       tgsi_dump(draw->vs.vertex_shader->state.tokens, 0);
 482
 483    if (0) {
 484       unsigned int i;
 485       debug_printf("Elements:\n");
 486       for (i = 0; i < draw->pt.nr_vertex_elements; i++) {
 487          debug_printf("  %u: src_offset=%u  inst_div=%u   vbuf=%u  format=%s\n",
 488                       i,
 489                       draw->pt.vertex_element[i].src_offset,
 490                       draw->pt.vertex_element[i].instance_divisor,
 491                       draw->pt.vertex_element[i].vertex_buffer_index,
 492                       util_format_name(draw->pt.vertex_element[i].src_format));
 493       }
 494       debug_printf("Buffers:\n");
 495       for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 496          debug_printf("  %u: stride=%u offset=%u ptr=%p\n",
 497                       i,
 498                       draw->pt.vertex_buffer[i].stride,
 499                       draw->pt.vertex_buffer[i].buffer_offset,
 500                       draw->pt.user.vbuffer[i]);
 501       }
 502    }
 503
 504    if (0)
 505       draw_print_arrays(draw, info->mode, info->start, MIN2(info->count, 20));
 506
 507    index_limit = util_draw_max_index(draw->pt.vertex_buffer,
 508                                      draw->pt.nr_vertex_buffers,
 509                                      draw->pt.vertex_element,
 510                                      draw->pt.nr_vertex_elements,
 511                                      info);
 512
 513    if (index_limit == 0) {
 514       /* one of the buffers is too small to do any valid drawing */
 515       debug_warning("draw: VBO too small to draw anything\n");
 516       return;
 517    }
 518
 519    draw->pt.max_index = index_limit - 1;
 520
 521
 522    /*
 523     * TODO: We could use draw->pt.max_index to further narrow
 524     * the min_index/max_index hints given by the state tracker.
 525     */
 526
 527    for (instance = 0; instance < info->instance_count; instance++) {
 528       draw->instance_id = instance + info->start_instance;
 529
 530       if (info->primitive_restart) {
 531          draw_pt_arrays_restart(draw, info);
 532       }
 533       else {
 534          draw_pt_arrays(draw, info->mode, info->start, info->count);
 535       }
 536    }
 537 }