src/gallium/auxiliary/draw/draw_context.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
  34 #include "pipe/p_util.h"
  35 #include "draw_context.h"
  36 #include "draw_vbuf.h"
  37 #include "draw_vs.h"
  38
  39
  40 struct draw_context *draw_create( void )
  41 {
  42    struct draw_context *draw = CALLOC_STRUCT( draw_context );
  43    if (draw == NULL)
  44       goto fail;
  45
  46 #if defined(__i386__) || defined(__386__)
  47    draw->use_sse = GETENV( "GALLIUM_NOSSE" ) == NULL;
  48 #else
  49    draw->use_sse = FALSE;
  50 #endif
  51
  52    /* create pipeline stages */
  53    draw->pipeline.wide_line  = draw_wide_line_stage( draw );
  54    draw->pipeline.wide_point = draw_wide_point_stage( draw );
  55    draw->pipeline.stipple   = draw_stipple_stage( draw );
  56    draw->pipeline.unfilled  = draw_unfilled_stage( draw );
  57    draw->pipeline.twoside   = draw_twoside_stage( draw );
  58    draw->pipeline.offset    = draw_offset_stage( draw );
  59    draw->pipeline.clip      = draw_clip_stage( draw );
  60    draw->pipeline.flatshade = draw_flatshade_stage( draw );
  61    draw->pipeline.cull      = draw_cull_stage( draw );
  62    draw->pipeline.validate  = draw_validate_stage( draw );
  63    draw->pipeline.first     = draw->pipeline.validate;
  64
  65    if (!draw->pipeline.wide_line ||
  66        !draw->pipeline.wide_point ||
  67        !draw->pipeline.stipple ||
  68        !draw->pipeline.unfilled ||
  69        !draw->pipeline.twoside ||
  70        !draw->pipeline.offset ||
  71        !draw->pipeline.clip ||
  72        !draw->pipeline.flatshade ||
  73        !draw->pipeline.cull ||
  74        !draw->pipeline.validate)
  75       goto fail;
  76
  77
  78    ASSIGN_4V( draw->plane[0], -1,  0,  0, 1 );
  79    ASSIGN_4V( draw->plane[1],  1,  0,  0, 1 );
  80    ASSIGN_4V( draw->plane[2],  0, -1,  0, 1 );
  81    ASSIGN_4V( draw->plane[3],  0,  1,  0, 1 );
  82    ASSIGN_4V( draw->plane[4],  0,  0,  1, 1 ); /* yes these are correct */
  83    ASSIGN_4V( draw->plane[5],  0,  0, -1, 1 ); /* mesa's a bit wonky */
  84    draw->nr_planes = 6;
  85
  86    /* Statically allocate maximum sized vertices for the cache - could be cleverer...
  87     */
  88    {
  89       char *tmp = align_malloc(VS_QUEUE_LENGTH * MAX_VERTEX_ALLOCATION, 16);
  90       if (!tmp)
  91          goto fail;
  92
  93       draw->vs.vertex_cache = tmp;
  94    }
  95
  96    draw->shader_queue_flush = draw_vertex_shader_queue_flush;
  97
  98    /* these defaults are oriented toward the needs of softpipe */
  99    draw->wide_point_threshold = 1000000.0; /* infinity */
 100    draw->wide_line_threshold = 1.0;
 101    draw->line_stipple = TRUE;
 102    draw->point_sprite = TRUE;
 103
 104    draw->reduced_prim = ~0; /* != any of PIPE_PRIM_x */
 105
 106    draw_vertex_cache_invalidate( draw );
 107    draw_set_mapped_element_buffer( draw, 0, NULL );
 108
 109    tgsi_exec_machine_init(&draw->machine);
 110
 111    /* FIXME: give this machine thing a proper constructor:
 112     */
 113    draw->machine.Inputs = align_malloc(PIPE_MAX_ATTRIBS * sizeof(struct tgsi_exec_vector), 16);
 114    draw->machine.Outputs = align_malloc(PIPE_MAX_ATTRIBS * sizeof(struct tgsi_exec_vector), 16);
 115
 116
 117    if (!draw_pt_init( draw ))
 118       goto fail;
 119
 120    return draw;
 121
 122 fail:
 123    draw_destroy( draw );
 124    return NULL;
 125 }
 126
 127
 128 void draw_destroy( struct draw_context *draw )
 129 {
 130    if (!draw)
 131       return;
 132
 133    if (draw->pipeline.wide_line)
 134       draw->pipeline.wide_line->destroy( draw->pipeline.wide_line );
 135    if (draw->pipeline.wide_point)
 136       draw->pipeline.wide_point->destroy( draw->pipeline.wide_point );
 137    if (draw->pipeline.stipple)
 138       draw->pipeline.stipple->destroy( draw->pipeline.stipple );
 139    if (draw->pipeline.unfilled)
 140       draw->pipeline.unfilled->destroy( draw->pipeline.unfilled );
 141    if (draw->pipeline.twoside)
 142       draw->pipeline.twoside->destroy( draw->pipeline.twoside );
 143    if (draw->pipeline.offset)
 144       draw->pipeline.offset->destroy( draw->pipeline.offset );
 145    if (draw->pipeline.clip)
 146       draw->pipeline.clip->destroy( draw->pipeline.clip );
 147    if (draw->pipeline.flatshade)
 148       draw->pipeline.flatshade->destroy( draw->pipeline.flatshade );
 149    if (draw->pipeline.cull)
 150       draw->pipeline.cull->destroy( draw->pipeline.cull );
 151    if (draw->pipeline.validate)
 152       draw->pipeline.validate->destroy( draw->pipeline.validate );
 153    if (draw->pipeline.aaline)
 154       draw->pipeline.aaline->destroy( draw->pipeline.aaline );
 155    if (draw->pipeline.aapoint)
 156       draw->pipeline.aapoint->destroy( draw->pipeline.aapoint );
 157    if (draw->pipeline.pstipple)
 158       draw->pipeline.pstipple->destroy( draw->pipeline.pstipple );
 159    if (draw->pipeline.rasterize)
 160       draw->pipeline.rasterize->destroy( draw->pipeline.rasterize );
 161
 162    if (draw->machine.Inputs)
 163       align_free(draw->machine.Inputs);
 164    if (draw->machine.Outputs)
 165       align_free(draw->machine.Outputs);
 166    tgsi_exec_machine_free_data(&draw->machine);
 167
 168
 169    if (draw->vs.vertex_cache)
 170       align_free( draw->vs.vertex_cache ); /* Frees all the vertices. */
 171
 172    /* Not so fast -- we're just borrowing this at the moment.
 173     *
 174    if (draw->render)
 175       draw->render->destroy( draw->render );
 176    */
 177
 178    draw_pt_destroy( draw );
 179
 180    FREE( draw );
 181 }
 182
 183
 184
 185 void draw_flush( struct draw_context *draw )
 186 {
 187    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 188 }
 189
 190
 191
 192 /**
 193  * Register new primitive rasterization/rendering state.
 194  * This causes the drawing pipeline to be rebuilt.
 195  */
 196 void draw_set_rasterizer_state( struct draw_context *draw,
 197                                 const struct pipe_rasterizer_state *raster )
 198 {
 199    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 200
 201    draw->rasterizer = raster;
 202 }
 203
 204
 205 /**
 206  * Plug in the primitive rendering/rasterization stage (which is the last
 207  * stage in the drawing pipeline).
 208  * This is provided by the device driver.
 209  */
 210 void draw_set_rasterize_stage( struct draw_context *draw,
 211                                struct draw_stage *stage )
 212 {
 213    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 214
 215    draw->pipeline.rasterize = stage;
 216 }
 217
 218
 219 /**
 220  * Set the draw module's clipping state.
 221  */
 222 void draw_set_clip_state( struct draw_context *draw,
 223                           const struct pipe_clip_state *clip )
 224 {
 225    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 226
 227    assert(clip->nr <= PIPE_MAX_CLIP_PLANES);
 228    memcpy(&draw->plane[6], clip->ucp, clip->nr * sizeof(clip->ucp[0]));
 229    draw->nr_planes = 6 + clip->nr;
 230 }
 231
 232
 233 /**
 234  * Set the draw module's viewport state.
 235  */
 236 void draw_set_viewport_state( struct draw_context *draw,
 237                               const struct pipe_viewport_state *viewport )
 238 {
 239    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 240    draw->viewport = *viewport; /* struct copy */
 241    draw->identity_viewport = (viewport->scale[0] == 1.0f &&
 242                               viewport->scale[1] == 1.0f &&
 243                               viewport->scale[2] == 1.0f &&
 244                               viewport->scale[3] == 1.0f &&
 245                               viewport->translate[0] == 0.0f &&
 246                               viewport->translate[1] == 0.0f &&
 247                               viewport->translate[2] == 0.0f &&
 248                               viewport->translate[3] == 0.0f);
 249 }
 250
 251
 252
 253 void
 254 draw_set_vertex_buffers(struct draw_context *draw,
 255                         unsigned count,
 256                         const struct pipe_vertex_buffer *buffers)
 257 {
 258    assert(count <= PIPE_MAX_ATTRIBS);
 259
 260    draw_do_flush( draw, DRAW_FLUSH_VERTEX_CACHE/*STATE_CHANGE*/ );
 261
 262    memcpy(draw->vertex_buffer, buffers, count * sizeof(buffers[0]));
 263    draw->nr_vertex_buffers = count;
 264 }
 265
 266
 267 void
 268 draw_set_vertex_elements(struct draw_context *draw,
 269                          unsigned count,
 270                          const struct pipe_vertex_element *elements)
 271 {
 272    assert(count <= PIPE_MAX_ATTRIBS);
 273
 274    draw_do_flush( draw, DRAW_FLUSH_VERTEX_CACHE/*STATE_CHANGE*/ );
 275
 276    memcpy(draw->vertex_element, elements, count * sizeof(elements[0]));
 277    draw->nr_vertex_elements = count;
 278 }
 279
 280
 281 /**
 282  * Tell drawing context where to find mapped vertex buffers.
 283  */
 284 void
 285 draw_set_mapped_vertex_buffer(struct draw_context *draw,
 286                               unsigned attr, const void *buffer)
 287 {
 288    draw_do_flush( draw, DRAW_FLUSH_VERTEX_CACHE/*STATE_CHANGE*/ );
 289    draw->user.vbuffer[attr] = buffer;
 290 }
 291
 292
 293 void
 294 draw_set_mapped_constant_buffer(struct draw_context *draw,
 295                                 const void *buffer)
 296 {
 297    draw_do_flush( draw, DRAW_FLUSH_VERTEX_CACHE/*STATE_CHANGE*/ );
 298    draw->user.constants = buffer;
 299 }
 300
 301
 302 /**
 303  * Tells the draw module to draw points with triangles if their size
 304  * is greater than this threshold.
 305  */
 306 void
 307 draw_wide_point_threshold(struct draw_context *draw, float threshold)
 308 {
 309    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 310    draw->wide_point_threshold = threshold;
 311 }
 312
 313
 314 /**
 315  * Tells the draw module to draw lines with triangles if their width
 316  * is greater than this threshold.
 317  */
 318 void
 319 draw_wide_line_threshold(struct draw_context *draw, float threshold)
 320 {
 321    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 322    draw->wide_line_threshold = threshold;
 323 }
 324
 325
 326 /**
 327  * Tells the draw module whether or not to implement line stipple.
 328  */
 329 void
 330 draw_enable_line_stipple(struct draw_context *draw, boolean enable)
 331 {
 332    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 333    draw->line_stipple = enable;
 334 }
 335
 336
 337 /**
 338  * Tells draw module whether to convert points to quads for sprite mode.
 339  */
 340 void
 341 draw_enable_point_sprites(struct draw_context *draw, boolean enable)
 342 {
 343    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 344    draw->point_sprite = enable;
 345 }
 346
 347
 348 /**
 349  * Ask the draw module for the location/slot of the given vertex attribute in
 350  * a post-transformed vertex.
 351  *
 352  * With this function, drivers that use the draw module should have no reason
 353  * to track the current vertex shader.
 354  *
 355  * Note that the draw module may sometimes generate vertices with extra
 356  * attributes (such as texcoords for AA lines).  The driver can call this
 357  * function to find those attributes.
 358  *
 359  * Zero is returned if the attribute is not found since this is
 360  * a don't care / undefined situtation.  Returning -1 would be a bit more
 361  * work for the drivers.
 362  */
 363 int
 364 draw_find_vs_output(struct draw_context *draw,
 365                     uint semantic_name, uint semantic_index)
 366 {
 367    const struct draw_vertex_shader *vs = draw->vertex_shader;
 368    uint i;
 369    for (i = 0; i < vs->info.num_outputs; i++) {
 370       if (vs->info.output_semantic_name[i] == semantic_name &&
 371           vs->info.output_semantic_index[i] == semantic_index)
 372          return i;
 373    }
 374
 375    /* XXX there may be more than one extra vertex attrib.
 376     * For example, simulated gl_FragCoord and gl_PointCoord.
 377     */
 378    if (draw->extra_vp_outputs.semantic_name == semantic_name &&
 379        draw->extra_vp_outputs.semantic_index == semantic_index) {
 380       return draw->extra_vp_outputs.slot;
 381    }
 382    return 0;
 383 }
 384
 385
 386 /**
 387  * Return number of vertex shader outputs.
 388  */
 389 uint
 390 draw_num_vs_outputs(struct draw_context *draw)
 391 {
 392    uint count = draw->vertex_shader->info.num_outputs;
 393    if (draw->extra_vp_outputs.slot > 0)
 394       count++;
 395    return count;
 396 }
 397
 398
 399 /**
 400  * Allocate space for temporary post-transform vertices, such as for clipping.
 401  */
 402 void draw_alloc_temp_verts( struct draw_stage *stage, unsigned nr )
 403 {
 404    assert(!stage->tmp);
 405
 406    stage->nr_tmps = nr;
 407
 408    if (nr) {
 409       ubyte *store = (ubyte *) MALLOC( MAX_VERTEX_SIZE * nr );
 410       unsigned i;
 411
 412       stage->tmp = (struct vertex_header **) MALLOC( sizeof(struct vertex_header *) * nr );
 413
 414       for (i = 0; i < nr; i++)
 415          stage->tmp[i] = (struct vertex_header *)(store + i * MAX_VERTEX_SIZE);
 416    }
 417 }
 418
 419
 420 void draw_free_temp_verts( struct draw_stage *stage )
 421 {
 422    if (stage->tmp) {
 423       FREE( stage->tmp[0] );
 424       FREE( stage->tmp );
 425       stage->tmp = NULL;
 426    }
 427 }
 428
 429
 430 boolean draw_use_sse(struct draw_context *draw)
 431 {
 432    return (boolean) draw->use_sse;
 433 }
 434
 435
 436 void draw_reset_vertex_ids(struct draw_context *draw)
 437 {
 438    struct draw_stage *stage = draw->pipeline.first;
 439
 440    while (stage) {
 441       unsigned i;
 442
 443       for (i = 0; i < stage->nr_tmps; i++)
 444          stage->tmp[i]->vertex_id = UNDEFINED_VERTEX_ID;
 445
 446       stage = stage->next;
 447    }
 448
 449    draw_vertex_cache_reset_vertex_ids(draw); /* going away soon */
 450    draw_pt_reset_vertex_ids(draw);
 451 }
 452
 453
 454 void draw_set_render( struct draw_context *draw,
 455                       struct vbuf_render *render )
 456 {
 457    draw->render = render;
 458 }
 459
 460 void draw_set_edgeflags( struct draw_context *draw,
 461                          const unsigned *edgeflag )
 462 {
 463    draw->user.edgeflag = edgeflag;
 464 }
 465
 466
 467 boolean draw_get_edgeflag( struct draw_context *draw,
 468                            unsigned idx )
 469 {
 470    if (draw->user.edgeflag)
 471       return (draw->user.edgeflag[idx/32] & (1 << (idx%32))) != 0;
 472    else
 473       return 1;
 474 }
 475