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