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          /* indexed arrays */
 236
 237          switch (draw->pt.user.eltSize) {
 238          case 1:
 239             {
 240                const ubyte *elem = (const ubyte *) draw->pt.user.elts;
 241                ii = elem[start + i];
 242             }
 243             break;
 244          case 2:
 245             {
 246                const ushort *elem = (const ushort *) draw->pt.user.elts;
 247                ii = elem[start + i];
 248             }
 249             break;
 250          case 4:
 251             {
 252                const uint *elem = (const uint *) draw->pt.user.elts;
 253                ii = elem[start + i];
 254             }
 255             break;
 256          default:
 257             assert(0);
 258             return;
 259          }
 260          ii += draw->pt.user.eltBias;
 261          debug_printf("Element[%u + %u] + %i -> Vertex %u:\n", start, i,
 262                       draw->pt.user.eltBias, ii);
 263       }
 264       else {
 265          /* non-indexed arrays */
 266          ii = start + i;
 267          debug_printf("Vertex %u:\n", ii);
 268       }
 269
 270       for (j = 0; j < draw->pt.nr_vertex_elements; j++) {
 271          uint buf = draw->pt.vertex_element[j].vertex_buffer_index;
 272          ubyte *ptr = (ubyte *) draw->pt.user.vbuffer[buf];
 273
 274          if (draw->pt.vertex_element[j].instance_divisor) {
 275             ii = draw->instance_id / draw->pt.vertex_element[j].instance_divisor;
 276          }
 277
 278          ptr += draw->pt.vertex_buffer[buf].buffer_offset;
 279          ptr += draw->pt.vertex_buffer[buf].stride * ii;
 280          ptr += draw->pt.vertex_element[j].src_offset;
 281
 282          debug_printf("  Attr %u: ", j);
 283          switch (draw->pt.vertex_element[j].src_format) {
 284          case PIPE_FORMAT_R32_FLOAT:
 285             {
 286                float *v = (float *) ptr;
 287                debug_printf("R %f  @ %p\n", v[0], (void *) v);
 288             }
 289             break;
 290          case PIPE_FORMAT_R32G32_FLOAT:
 291             {
 292                float *v = (float *) ptr;
 293                debug_printf("RG %f %f  @ %p\n", v[0], v[1], (void *) v);
 294             }
 295             break;
 296          case PIPE_FORMAT_R32G32B32_FLOAT:
 297             {
 298                float *v = (float *) ptr;
 299                debug_printf("RGB %f %f %f  @ %p\n", v[0], v[1], v[2], (void *) v);
 300             }
 301             break;
 302          case PIPE_FORMAT_R32G32B32A32_FLOAT:
 303             {
 304                float *v = (float *) ptr;
 305                debug_printf("RGBA %f %f %f %f  @ %p\n", v[0], v[1], v[2], v[3],
 306                             (void *) v);
 307             }
 308             break;
 309          case PIPE_FORMAT_B8G8R8A8_UNORM:
 310             {
 311                ubyte *u = (ubyte *) ptr;
 312                debug_printf("BGRA %d %d %d %d  @ %p\n", u[0], u[1], u[2], u[3],
 313                             (void *) u);
 314             }
 315             break;
 316          default:
 317             debug_printf("other format %s (fix me)\n",
 318                      util_format_name(draw->pt.vertex_element[j].src_format));
 319          }
 320       }
 321    }
 322 }
 323
 324
 325 /** Helper code for below */
 326 #define PRIM_RESTART_LOOP(elements) \
 327    do { \
 328       for (i = start; i < end; i++) { \
 329          if (elements[i] == info->restart_index) { \
 330             if (cur_count > 0) { \
 331                /* draw elts up to prev pos */ \
 332                draw_pt_arrays(draw, prim, cur_start, cur_count); \
 333             } \
 334             /* begin new prim at next elt */ \
 335             cur_start = i + 1; \
 336             cur_count = 0; \
 337          } \
 338          else { \
 339             cur_count++; \
 340          } \
 341       } \
 342       if (cur_count > 0) { \
 343          draw_pt_arrays(draw, prim, cur_start, cur_count); \
 344       } \
 345    } while (0)
 346
 347
 348 /**
 349  * For drawing prims with primitive restart enabled.
 350  * Scan for restart indexes and draw the runs of elements/vertices between
 351  * the restarts.
 352  */
 353 static void
 354 draw_pt_arrays_restart(struct draw_context *draw,
 355                        const struct pipe_draw_info *info)
 356 {
 357    const unsigned prim = info->mode;
 358    const unsigned start = info->start;
 359    const unsigned count = info->count;
 360    const unsigned end = start + count;
 361    unsigned i, cur_start, cur_count;
 362
 363    assert(info->primitive_restart);
 364
 365    if (draw->pt.user.elts) {
 366       /* indexed prims (draw_elements) */
 367       cur_start = start;
 368       cur_count = 0;
 369
 370       switch (draw->pt.user.eltSize) {
 371       case 1:
 372          {
 373             const ubyte *elt_ub = (const ubyte *) draw->pt.user.elts;
 374             PRIM_RESTART_LOOP(elt_ub);
 375          }
 376          break;
 377       case 2:
 378          {
 379             const ushort *elt_us = (const ushort *) draw->pt.user.elts;
 380             PRIM_RESTART_LOOP(elt_us);
 381          }
 382          break;
 383       case 4:
 384          {
 385             const uint *elt_ui = (const uint *) draw->pt.user.elts;
 386             PRIM_RESTART_LOOP(elt_ui);
 387          }
 388          break;
 389       default:
 390          assert(0 && "bad eltSize in draw_arrays()");
 391       }
 392    }
 393    else {
 394       /* Non-indexed prims (draw_arrays).
 395        * Primitive restart should have been handled in the state tracker.
 396        */
 397       draw_pt_arrays(draw, prim, start, count);
 398    }
 399 }
 400
 401
 402
 403 /**
 404  * Non-instanced drawing.
 405  * \sa draw_arrays_instanced
 406  */
 407 void
 408 draw_arrays(struct draw_context *draw, unsigned prim,
 409             unsigned start, unsigned count)
 410 {
 411    draw_arrays_instanced(draw, prim, start, count, 0, 1);
 412 }
 413
 414
 415 /**
 416  * Instanced drawing.
 417  * \sa draw_vbo
 418  */
 419 void
 420 draw_arrays_instanced(struct draw_context *draw,
 421                       unsigned mode,
 422                       unsigned start,
 423                       unsigned count,
 424                       unsigned startInstance,
 425                       unsigned instanceCount)
 426 {
 427    struct pipe_draw_info info;
 428
 429    util_draw_init_info(&info);
 430
 431    info.mode = mode;
 432    info.start = start;
 433    info.count = count;
 434    info.start_instance = startInstance;
 435    info.instance_count = instanceCount;
 436
 437    info.indexed = (draw->pt.user.elts != NULL);
 438    if (!info.indexed) {
 439       info.min_index = start;
 440       info.max_index = start + count - 1;
 441    }
 442
 443    draw_vbo(draw, &info);
 444 }
 445
 446
 447 /**
 448  * Draw vertex arrays.
 449  * This is the main entrypoint into the drawing module.  If drawing an indexed
 450  * primitive, the draw_set_index_buffer() and draw_set_mapped_index_buffer()
 451  * functions should have already been called to specify the element/index
 452  * buffer information.
 453  */
 454 void
 455 draw_vbo(struct draw_context *draw,
 456          const struct pipe_draw_info *info)
 457 {
 458    unsigned instance;
 459    unsigned index_limit;
 460
 461    assert(info->instance_count > 0);
 462    if (info->indexed)
 463       assert(draw->pt.user.elts);
 464
 465    draw->pt.user.eltBias = info->index_bias;
 466    draw->pt.user.min_index = info->min_index;
 467    draw->pt.user.max_index = info->max_index;
 468
 469    if (0)
 470       debug_printf("draw_vbo(mode=%u start=%u count=%u):\n",
 471                    info->mode, info->start, info->count);
 472
 473    if (0)
 474       tgsi_dump(draw->vs.vertex_shader->state.tokens, 0);
 475
 476    if (0) {
 477       unsigned int i;
 478       debug_printf("Elements:\n");
 479       for (i = 0; i < draw->pt.nr_vertex_elements; i++) {
 480          debug_printf("  %u: src_offset=%u  inst_div=%u   vbuf=%u  format=%s\n",
 481                       i,
 482                       draw->pt.vertex_element[i].src_offset,
 483                       draw->pt.vertex_element[i].instance_divisor,
 484                       draw->pt.vertex_element[i].vertex_buffer_index,
 485                       util_format_name(draw->pt.vertex_element[i].src_format));
 486       }
 487       debug_printf("Buffers:\n");
 488       for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 489          debug_printf("  %u: stride=%u offset=%u ptr=%p\n",
 490                       i,
 491                       draw->pt.vertex_buffer[i].stride,
 492                       draw->pt.vertex_buffer[i].buffer_offset,
 493                       draw->pt.user.vbuffer[i]);
 494       }
 495    }
 496
 497    if (0)
 498       draw_print_arrays(draw, info->mode, info->start, MIN2(info->count, 20));
 499
 500    index_limit = util_draw_max_index(draw->pt.vertex_buffer,
 501                                      draw->pt.vertex_element,
 502                                      draw->pt.nr_vertex_elements,
 503                                      info);
 504
 505    if (index_limit == 0) {
 506       /* one of the buffers is too small to do any valid drawing */
 507       debug_warning("draw: VBO too small to draw anything\n");
 508       return;
 509    }
 510
 511    draw->pt.max_index = index_limit - 1;
 512
 513
 514    /*
 515     * TODO: We could use draw->pt.max_index to further narrow
 516     * the min_index/max_index hints given by the state tracker.
 517     */
 518
 519    for (instance = 0; instance < info->instance_count; instance++) {
 520       draw->instance_id = instance + info->start_instance;
 521
 522       if (info->primitive_restart) {
 523          draw_pt_arrays_restart(draw, info);
 524       }
 525       else {
 526          draw_pt_arrays(draw, info->mode, info->start, info->count);
 527       }
 528    }
 529 }