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 prepares 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    if (draw->pt.rebind_parameters) {
 143       /* update constants, viewport dims, clip planes, etc */
 144       middle->bind_parameters(middle);
 145       draw->pt.rebind_parameters = FALSE;
 146    }
 147
 148    frontend->run( frontend, start, count );
 149
 150    return TRUE;
 151 }
 152
 153 void draw_pt_flush( struct draw_context *draw, unsigned flags )
 154 {
 155    assert(flags);
 156
 157    if (draw->pt.frontend) {
 158       draw->pt.frontend->flush( draw->pt.frontend, flags );
 159
 160       /* don't prepare if we only are flushing the backend */
 161       if (flags & DRAW_FLUSH_STATE_CHANGE)
 162          draw->pt.frontend = NULL;
 163    }
 164
 165    if (flags & DRAW_FLUSH_PARAMETER_CHANGE) {
 166       draw->pt.rebind_parameters = TRUE;
 167    }
 168 }
 169
 170
 171
 172 boolean draw_pt_init( struct draw_context *draw )
 173 {
 174    draw->pt.test_fse = debug_get_option_draw_fse();
 175    draw->pt.no_fse = debug_get_option_draw_no_fse();
 176
 177    draw->pt.front.vsplit = draw_pt_vsplit(draw);
 178    if (!draw->pt.front.vsplit)
 179       return FALSE;
 180
 181    draw->pt.middle.fetch_emit = draw_pt_fetch_emit( draw );
 182    if (!draw->pt.middle.fetch_emit)
 183       return FALSE;
 184
 185    draw->pt.middle.fetch_shade_emit = draw_pt_middle_fse( draw );
 186    if (!draw->pt.middle.fetch_shade_emit)
 187       return FALSE;
 188
 189    draw->pt.middle.general = draw_pt_fetch_pipeline_or_emit( draw );
 190    if (!draw->pt.middle.general)
 191       return FALSE;
 192
 193 #if HAVE_LLVM
 194    if (draw->llvm)
 195       draw->pt.middle.llvm = draw_pt_fetch_pipeline_or_emit_llvm( draw );
 196 #endif
 197
 198    return TRUE;
 199 }
 200
 201
 202 void draw_pt_destroy( struct draw_context *draw )
 203 {
 204    if (draw->pt.middle.llvm) {
 205       draw->pt.middle.llvm->destroy( draw->pt.middle.llvm );
 206       draw->pt.middle.llvm = NULL;
 207    }
 208
 209    if (draw->pt.middle.general) {
 210       draw->pt.middle.general->destroy( draw->pt.middle.general );
 211       draw->pt.middle.general = NULL;
 212    }
 213
 214    if (draw->pt.middle.fetch_emit) {
 215       draw->pt.middle.fetch_emit->destroy( draw->pt.middle.fetch_emit );
 216       draw->pt.middle.fetch_emit = NULL;
 217    }
 218
 219    if (draw->pt.middle.fetch_shade_emit) {
 220       draw->pt.middle.fetch_shade_emit->destroy( draw->pt.middle.fetch_shade_emit );
 221       draw->pt.middle.fetch_shade_emit = NULL;
 222    }
 223
 224    if (draw->pt.front.vsplit) {
 225       draw->pt.front.vsplit->destroy( draw->pt.front.vsplit );
 226       draw->pt.front.vsplit = NULL;
 227    }
 228 }
 229
 230
 231 /**
 232  * Debug- print the first 'count' vertices.
 233  */
 234 static void
 235 draw_print_arrays(struct draw_context *draw, uint prim, int start, uint count)
 236 {
 237    uint i;
 238
 239    debug_printf("Draw arrays(prim = %u, start = %u, count = %u)\n",
 240                 prim, start, count);
 241
 242    for (i = 0; i < count; i++) {
 243       uint ii = 0;
 244       uint j;
 245
 246       if (draw->pt.user.eltSize) {
 247          /* indexed arrays */
 248
 249          switch (draw->pt.user.eltSize) {
 250          case 1:
 251             {
 252                const ubyte *elem = (const ubyte *) draw->pt.user.elts;
 253                ii = elem[start + i];
 254             }
 255             break;
 256          case 2:
 257             {
 258                const ushort *elem = (const ushort *) draw->pt.user.elts;
 259                ii = elem[start + i];
 260             }
 261             break;
 262          case 4:
 263             {
 264                const uint *elem = (const uint *) draw->pt.user.elts;
 265                ii = elem[start + i];
 266             }
 267             break;
 268          default:
 269             assert(0);
 270             return;
 271          }
 272          ii += draw->pt.user.eltBias;
 273          debug_printf("Element[%u + %u] + %i -> Vertex %u:\n", start, i,
 274                       draw->pt.user.eltBias, ii);
 275       }
 276       else {
 277          /* non-indexed arrays */
 278          ii = start + i;
 279          debug_printf("Vertex %u:\n", ii);
 280       }
 281
 282       for (j = 0; j < draw->pt.nr_vertex_elements; j++) {
 283          uint buf = draw->pt.vertex_element[j].vertex_buffer_index;
 284          ubyte *ptr = (ubyte *) draw->pt.user.vbuffer[buf];
 285
 286          if (draw->pt.vertex_element[j].instance_divisor) {
 287             ii = draw->instance_id / draw->pt.vertex_element[j].instance_divisor;
 288          }
 289
 290          ptr += draw->pt.vertex_buffer[buf].buffer_offset;
 291          ptr += draw->pt.vertex_buffer[buf].stride * ii;
 292          ptr += draw->pt.vertex_element[j].src_offset;
 293
 294          debug_printf("  Attr %u: ", j);
 295          switch (draw->pt.vertex_element[j].src_format) {
 296          case PIPE_FORMAT_R32_FLOAT:
 297             {
 298                float *v = (float *) ptr;
 299                debug_printf("R %f  @ %p\n", v[0], (void *) v);
 300             }
 301             break;
 302          case PIPE_FORMAT_R32G32_FLOAT:
 303             {
 304                float *v = (float *) ptr;
 305                debug_printf("RG %f %f  @ %p\n", v[0], v[1], (void *) v);
 306             }
 307             break;
 308          case PIPE_FORMAT_R32G32B32_FLOAT:
 309             {
 310                float *v = (float *) ptr;
 311                debug_printf("RGB %f %f %f  @ %p\n", v[0], v[1], v[2], (void *) v);
 312             }
 313             break;
 314          case PIPE_FORMAT_R32G32B32A32_FLOAT:
 315             {
 316                float *v = (float *) ptr;
 317                debug_printf("RGBA %f %f %f %f  @ %p\n", v[0], v[1], v[2], v[3],
 318                             (void *) v);
 319             }
 320             break;
 321          case PIPE_FORMAT_B8G8R8A8_UNORM:
 322             {
 323                ubyte *u = (ubyte *) ptr;
 324                debug_printf("BGRA %d %d %d %d  @ %p\n", u[0], u[1], u[2], u[3],
 325                             (void *) u);
 326             }
 327             break;
 328          default:
 329             debug_printf("other format %s (fix me)\n",
 330                      util_format_name(draw->pt.vertex_element[j].src_format));
 331          }
 332       }
 333    }
 334 }
 335
 336
 337 /** Helper code for below */
 338 #define PRIM_RESTART_LOOP(elements) \
 339    do { \
 340       for (i = start; i < end; i++) { \
 341          if (elements[i] == info->restart_index) { \
 342             if (cur_count > 0) { \
 343                /* draw elts up to prev pos */ \
 344                draw_pt_arrays(draw, prim, cur_start, cur_count); \
 345             } \
 346             /* begin new prim at next elt */ \
 347             cur_start = i + 1; \
 348             cur_count = 0; \
 349          } \
 350          else { \
 351             cur_count++; \
 352          } \
 353       } \
 354       if (cur_count > 0) { \
 355          draw_pt_arrays(draw, prim, cur_start, cur_count); \
 356       } \
 357    } while (0)
 358
 359
 360 /**
 361  * For drawing prims with primitive restart enabled.
 362  * Scan for restart indexes and draw the runs of elements/vertices between
 363  * the restarts.
 364  */
 365 static void
 366 draw_pt_arrays_restart(struct draw_context *draw,
 367                        const struct pipe_draw_info *info)
 368 {
 369    const unsigned prim = info->mode;
 370    const unsigned start = info->start;
 371    const unsigned count = info->count;
 372    const unsigned end = start + count;
 373    unsigned i, cur_start, cur_count;
 374
 375    assert(info->primitive_restart);
 376
 377    if (draw->pt.user.eltSize) {
 378       /* indexed prims (draw_elements) */
 379       cur_start = start;
 380       cur_count = 0;
 381
 382       switch (draw->pt.user.eltSize) {
 383       case 1:
 384          {
 385             const ubyte *elt_ub = (const ubyte *) draw->pt.user.elts;
 386             PRIM_RESTART_LOOP(elt_ub);
 387          }
 388          break;
 389       case 2:
 390          {
 391             const ushort *elt_us = (const ushort *) draw->pt.user.elts;
 392             PRIM_RESTART_LOOP(elt_us);
 393          }
 394          break;
 395       case 4:
 396          {
 397             const uint *elt_ui = (const uint *) draw->pt.user.elts;
 398             PRIM_RESTART_LOOP(elt_ui);
 399          }
 400          break;
 401       default:
 402          assert(0 && "bad eltSize in draw_arrays()");
 403       }
 404    }
 405    else {
 406       /* Non-indexed prims (draw_arrays).
 407        * Primitive restart should have been handled in the state tracker.
 408        */
 409       draw_pt_arrays(draw, prim, start, count);
 410    }
 411 }
 412
 413
 414
 415 /**
 416  * Non-instanced drawing.
 417  * \sa draw_arrays_instanced
 418  */
 419 void
 420 draw_arrays(struct draw_context *draw, unsigned prim,
 421             unsigned start, unsigned count)
 422 {
 423    draw_arrays_instanced(draw, prim, start, count, 0, 1);
 424 }
 425
 426
 427 /**
 428  * Instanced drawing.
 429  * \sa draw_vbo
 430  */
 431 void
 432 draw_arrays_instanced(struct draw_context *draw,
 433                       unsigned mode,
 434                       unsigned start,
 435                       unsigned count,
 436                       unsigned startInstance,
 437                       unsigned instanceCount)
 438 {
 439    struct pipe_draw_info info;
 440
 441    util_draw_init_info(&info);
 442
 443    info.mode = mode;
 444    info.start = start;
 445    info.count = count;
 446    info.start_instance = startInstance;
 447    info.instance_count = instanceCount;
 448    info.min_index = start;
 449    info.max_index = start + count - 1;
 450
 451    draw_vbo(draw, &info);
 452 }
 453
 454
 455 /**
 456  * Draw vertex arrays.
 457  * This is the main entrypoint into the drawing module.  If drawing an indexed
 458  * primitive, the draw_set_indexes() function should have already been called
 459  * to specify the element/index buffer information.
 460  */
 461 void
 462 draw_vbo(struct draw_context *draw,
 463          const struct pipe_draw_info *info)
 464 {
 465    unsigned instance;
 466    unsigned index_limit;
 467
 468    assert(info->instance_count > 0);
 469    if (info->indexed)
 470       assert(draw->pt.user.elts);
 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    draw->pt.user.eltSize = info->indexed ? draw->pt.user.eltSizeIB : 0;
 476
 477    if (0)
 478       debug_printf("draw_vbo(mode=%u start=%u count=%u):\n",
 479                    info->mode, info->start, info->count);
 480
 481    if (0)
 482       tgsi_dump(draw->vs.vertex_shader->state.tokens, 0);
 483
 484    if (0) {
 485       unsigned int i;
 486       debug_printf("Elements:\n");
 487       for (i = 0; i < draw->pt.nr_vertex_elements; i++) {
 488          debug_printf("  %u: src_offset=%u  inst_div=%u   vbuf=%u  format=%s\n",
 489                       i,
 490                       draw->pt.vertex_element[i].src_offset,
 491                       draw->pt.vertex_element[i].instance_divisor,
 492                       draw->pt.vertex_element[i].vertex_buffer_index,
 493                       util_format_name(draw->pt.vertex_element[i].src_format));
 494       }
 495       debug_printf("Buffers:\n");
 496       for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 497          debug_printf("  %u: stride=%u offset=%u ptr=%p\n",
 498                       i,
 499                       draw->pt.vertex_buffer[i].stride,
 500                       draw->pt.vertex_buffer[i].buffer_offset,
 501                       draw->pt.user.vbuffer[i]);
 502       }
 503    }
 504
 505    if (0)
 506       draw_print_arrays(draw, info->mode, info->start, MIN2(info->count, 20));
 507
 508    index_limit = util_draw_max_index(draw->pt.vertex_buffer,
 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 }