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_context.h"
  35 #include "util/u_memory.h"
  36 #include "util/u_math.h"
  37 #include "util/u_cpu_detect.h"
  38 #include "util/u_inlines.h"
  39 #include "util/u_helpers.h"
  40 #include "util/u_prim.h"
  41 #include "draw_context.h"
  42 #include "draw_vs.h"
  43 #include "draw_gs.h"
  44
  45 #if HAVE_LLVM
  46 #include "gallivm/lp_bld_init.h"
  47 #include "gallivm/lp_bld_limits.h"
  48 #include "draw_llvm.h"
  49
  50 boolean
  51 draw_get_option_use_llvm(void)
  52 {
  53    static boolean first = TRUE;
  54    static boolean value;
  55    if (first) {
  56       first = FALSE;
  57       value = debug_get_bool_option("DRAW_USE_LLVM", TRUE);
  58
  59 #ifdef PIPE_ARCH_X86
  60       util_cpu_detect();
  61       /* require SSE2 due to LLVM PR6960. */
  62       if (!util_cpu_caps.has_sse2)
  63          value = FALSE;
  64 #endif
  65    }
  66    return value;
  67 }
  68 #endif
  69
  70
  71 /**
  72  * Create new draw module context with gallivm state for LLVM JIT.
  73  */
  74 static struct draw_context *
  75 draw_create_context(struct pipe_context *pipe, boolean try_llvm)
  76 {
  77    struct draw_context *draw = CALLOC_STRUCT( draw_context );
  78    if (draw == NULL)
  79       goto err_out;
  80
  81 #if HAVE_LLVM
  82    if (try_llvm && draw_get_option_use_llvm()) {
  83       draw->llvm = draw_llvm_create(draw);
  84       if (!draw->llvm)
  85          goto err_destroy;
  86    }
  87 #endif
  88
  89    draw->pipe = pipe;
  90
  91    if (!draw_init(draw))
  92       goto err_destroy;
  93
  94    return draw;
  95
  96 err_destroy:
  97    draw_destroy( draw );
  98 err_out:
  99    return NULL;
 100 }
 101
 102
 103 /**
 104  * Create new draw module context, with LLVM JIT.
 105  */
 106 struct draw_context *
 107 draw_create(struct pipe_context *pipe)
 108 {
 109    return draw_create_context(pipe, TRUE);
 110 }
 111
 112
 113 /**
 114  * Create a new draw context, without LLVM JIT.
 115  */
 116 struct draw_context *
 117 draw_create_no_llvm(struct pipe_context *pipe)
 118 {
 119    return draw_create_context(pipe, FALSE);
 120 }
 121
 122
 123 boolean draw_init(struct draw_context *draw)
 124 {
 125    /*
 126     * Note that several functions compute the clipmask of the predefined
 127     * formats with hardcoded formulas instead of using these. So modifications
 128     * here must be reflected there too.
 129     */
 130
 131    ASSIGN_4V( draw->plane[0], -1,  0,  0, 1 );
 132    ASSIGN_4V( draw->plane[1],  1,  0,  0, 1 );
 133    ASSIGN_4V( draw->plane[2],  0, -1,  0, 1 );
 134    ASSIGN_4V( draw->plane[3],  0,  1,  0, 1 );
 135    ASSIGN_4V( draw->plane[4],  0,  0,  1, 1 ); /* yes these are correct */
 136    ASSIGN_4V( draw->plane[5],  0,  0, -1, 1 ); /* mesa's a bit wonky */
 137    draw->clip_xy = TRUE;
 138    draw->clip_z = TRUE;
 139
 140    draw->pt.user.planes = (float (*) [DRAW_TOTAL_CLIP_PLANES][4]) &(draw->plane[0]);
 141
 142    if (!draw_pipeline_init( draw ))
 143       return FALSE;
 144
 145    if (!draw_pt_init( draw ))
 146       return FALSE;
 147
 148    if (!draw_vs_init( draw ))
 149       return FALSE;
 150
 151    if (!draw_gs_init( draw ))
 152       return FALSE;
 153
 154    draw->quads_always_flatshade_last = !draw->pipe->screen->get_param(
 155       draw->pipe->screen, PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION);
 156
 157    return TRUE;
 158 }
 159
 160 /*
 161  * Called whenever we're starting to draw a new instance.
 162  * Some internal structures don't want to have to reset internal
 163  * members on each invocation (because their state might have to persist
 164  * between multiple primitive restart rendering call) but might have to
 165  * for each new instance.
 166  * This is particularly the case for primitive id's in geometry shader.
 167  */
 168 void draw_new_instance(struct draw_context *draw)
 169 {
 170    draw_geometry_shader_new_instance(draw->gs.geometry_shader);
 171 }
 172
 173
 174 void draw_destroy( struct draw_context *draw )
 175 {
 176    struct pipe_context *pipe;
 177    unsigned i, j;
 178
 179    if (!draw)
 180       return;
 181
 182    pipe = draw->pipe;
 183
 184    /* free any rasterizer CSOs that we may have created.
 185     */
 186    for (i = 0; i < 2; i++) {
 187       for (j = 0; j < 2; j++) {
 188          if (draw->rasterizer_no_cull[i][j]) {
 189             pipe->delete_rasterizer_state(pipe, draw->rasterizer_no_cull[i][j]);
 190          }
 191       }
 192    }
 193
 194    for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 195       pipe_resource_reference(&draw->pt.vertex_buffer[i].buffer, NULL);
 196    }
 197
 198    /* Not so fast -- we're just borrowing this at the moment.
 199     *
 200    if (draw->render)
 201       draw->render->destroy( draw->render );
 202    */
 203
 204    draw_pipeline_destroy( draw );
 205    draw_pt_destroy( draw );
 206    draw_vs_destroy( draw );
 207    draw_gs_destroy( draw );
 208 #ifdef HAVE_LLVM
 209    if (draw->llvm)
 210       draw_llvm_destroy( draw->llvm );
 211 #endif
 212
 213    FREE( draw );
 214 }
 215
 216
 217
 218 void draw_flush( struct draw_context *draw )
 219 {
 220    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 221 }
 222
 223
 224 /**
 225  * Specify the Minimum Resolvable Depth factor for polygon offset.
 226  * This factor potentially depends on the number of Z buffer bits,
 227  * the rasterization algorithm and the arithmetic performed on Z
 228  * values between vertex shading and rasterization.  It will vary
 229  * from one driver to another.
 230  */
 231 void draw_set_mrd(struct draw_context *draw, double mrd)
 232 {
 233    draw->mrd = mrd;
 234 }
 235
 236
 237 static void update_clip_flags( struct draw_context *draw )
 238 {
 239    draw->clip_xy = !draw->driver.bypass_clip_xy;
 240    draw->guard_band_xy = (!draw->driver.bypass_clip_xy &&
 241                           draw->driver.guard_band_xy);
 242    draw->clip_z = (!draw->driver.bypass_clip_z &&
 243                    draw->rasterizer && draw->rasterizer->depth_clip);
 244    draw->clip_user = draw->rasterizer &&
 245                      draw->rasterizer->clip_plane_enable != 0;
 246 }
 247
 248 /**
 249  * Register new primitive rasterization/rendering state.
 250  * This causes the drawing pipeline to be rebuilt.
 251  */
 252 void draw_set_rasterizer_state( struct draw_context *draw,
 253                                 const struct pipe_rasterizer_state *raster,
 254                                 void *rast_handle )
 255 {
 256    if (!draw->suspend_flushing) {
 257       draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 258
 259       draw->rasterizer = raster;
 260       draw->rast_handle = rast_handle;
 261       update_clip_flags(draw);
 262    }
 263 }
 264
 265 /* With a little more work, llvmpipe will be able to turn this off and
 266  * do its own x/y clipping.
 267  *
 268  * Some hardware can turn off clipping altogether - in particular any
 269  * hardware with a TNL unit can do its own clipping, even if it is
 270  * relying on the draw module for some other reason.
 271  */
 272 void draw_set_driver_clipping( struct draw_context *draw,
 273                                boolean bypass_clip_xy,
 274                                boolean bypass_clip_z,
 275                                boolean guard_band_xy)
 276 {
 277    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 278
 279    draw->driver.bypass_clip_xy = bypass_clip_xy;
 280    draw->driver.bypass_clip_z = bypass_clip_z;
 281    draw->driver.guard_band_xy = guard_band_xy;
 282    update_clip_flags(draw);
 283 }
 284
 285
 286 /**
 287  * Plug in the primitive rendering/rasterization stage (which is the last
 288  * stage in the drawing pipeline).
 289  * This is provided by the device driver.
 290  */
 291 void draw_set_rasterize_stage( struct draw_context *draw,
 292                                struct draw_stage *stage )
 293 {
 294    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 295
 296    draw->pipeline.rasterize = stage;
 297 }
 298
 299
 300 /**
 301  * Set the draw module's clipping state.
 302  */
 303 void draw_set_clip_state( struct draw_context *draw,
 304                           const struct pipe_clip_state *clip )
 305 {
 306    draw_do_flush(draw, DRAW_FLUSH_PARAMETER_CHANGE);
 307
 308    memcpy(&draw->plane[6], clip->ucp, sizeof(clip->ucp));
 309 }
 310
 311
 312 /**
 313  * Set the draw module's viewport state.
 314  */
 315 void draw_set_viewport_states( struct draw_context *draw,
 316                                unsigned start_slot,
 317                                unsigned num_viewports,
 318                                const struct pipe_viewport_state *vps )
 319 {
 320    const struct pipe_viewport_state *viewport = vps;
 321    draw_do_flush(draw, DRAW_FLUSH_PARAMETER_CHANGE);
 322
 323    debug_assert(start_slot < PIPE_MAX_VIEWPORTS);
 324    debug_assert((start_slot + num_viewports) <= PIPE_MAX_VIEWPORTS);
 325
 326    memcpy(draw->viewports + start_slot, vps,
 327           sizeof(struct pipe_viewport_state) * num_viewports);
 328
 329    draw->identity_viewport = (num_viewports == 1) &&
 330       (viewport->scale[0] == 1.0f &&
 331        viewport->scale[1] == 1.0f &&
 332        viewport->scale[2] == 1.0f &&
 333        viewport->scale[3] == 1.0f &&
 334        viewport->translate[0] == 0.0f &&
 335        viewport->translate[1] == 0.0f &&
 336        viewport->translate[2] == 0.0f &&
 337        viewport->translate[3] == 0.0f);
 338 }
 339
 340
 341
 342 void
 343 draw_set_vertex_buffers(struct draw_context *draw,
 344                         unsigned start_slot, unsigned count,
 345                         const struct pipe_vertex_buffer *buffers)
 346 {
 347    assert(start_slot + count <= PIPE_MAX_ATTRIBS);
 348
 349    util_set_vertex_buffers_count(draw->pt.vertex_buffer,
 350                                  &draw->pt.nr_vertex_buffers,
 351                                  buffers, start_slot, count);
 352 }
 353
 354
 355 void
 356 draw_set_vertex_elements(struct draw_context *draw,
 357                          unsigned count,
 358                          const struct pipe_vertex_element *elements)
 359 {
 360    assert(count <= PIPE_MAX_ATTRIBS);
 361
 362    /* We could improve this by only flushing the frontend and the fetch part
 363     * of the middle. This would avoid recalculating the emit keys.*/
 364    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 365
 366    memcpy(draw->pt.vertex_element, elements, count * sizeof(elements[0]));
 367    draw->pt.nr_vertex_elements = count;
 368 }
 369
 370
 371 /**
 372  * Tell drawing context where to find mapped vertex buffers.
 373  */
 374 void
 375 draw_set_mapped_vertex_buffer(struct draw_context *draw,
 376                               unsigned attr, const void *buffer,
 377                               size_t size)
 378 {
 379    draw->pt.user.vbuffer[attr].map  = buffer;
 380    draw->pt.user.vbuffer[attr].size = size;
 381 }
 382
 383
 384 void
 385 draw_set_mapped_constant_buffer(struct draw_context *draw,
 386                                 unsigned shader_type,
 387                                 unsigned slot,
 388                                 const void *buffer,
 389                                 unsigned size )
 390 {
 391    debug_assert(shader_type == PIPE_SHADER_VERTEX ||
 392                 shader_type == PIPE_SHADER_GEOMETRY);
 393    debug_assert(slot < PIPE_MAX_CONSTANT_BUFFERS);
 394
 395    draw_do_flush(draw, DRAW_FLUSH_PARAMETER_CHANGE);
 396
 397    switch (shader_type) {
 398    case PIPE_SHADER_VERTEX:
 399       draw->pt.user.vs_constants[slot] = buffer;
 400       draw->pt.user.vs_constants_size[slot] = size;
 401       break;
 402    case PIPE_SHADER_GEOMETRY:
 403       draw->pt.user.gs_constants[slot] = buffer;
 404       draw->pt.user.gs_constants_size[slot] = size;
 405       break;
 406    default:
 407       assert(0 && "invalid shader type in draw_set_mapped_constant_buffer");
 408    }
 409 }
 410
 411
 412 /**
 413  * Tells the draw module to draw points with triangles if their size
 414  * is greater than this threshold.
 415  */
 416 void
 417 draw_wide_point_threshold(struct draw_context *draw, float threshold)
 418 {
 419    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 420    draw->pipeline.wide_point_threshold = threshold;
 421 }
 422
 423
 424 /**
 425  * Should the draw module handle point->quad conversion for drawing sprites?
 426  */
 427 void
 428 draw_wide_point_sprites(struct draw_context *draw, boolean draw_sprite)
 429 {
 430    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 431    draw->pipeline.wide_point_sprites = draw_sprite;
 432 }
 433
 434
 435 /**
 436  * Tells the draw module to draw lines with triangles if their width
 437  * is greater than this threshold.
 438  */
 439 void
 440 draw_wide_line_threshold(struct draw_context *draw, float threshold)
 441 {
 442    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 443    draw->pipeline.wide_line_threshold = roundf(threshold);
 444 }
 445
 446
 447 /**
 448  * Tells the draw module whether or not to implement line stipple.
 449  */
 450 void
 451 draw_enable_line_stipple(struct draw_context *draw, boolean enable)
 452 {
 453    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 454    draw->pipeline.line_stipple = enable;
 455 }
 456
 457
 458 /**
 459  * Tells draw module whether to convert points to quads for sprite mode.
 460  */
 461 void
 462 draw_enable_point_sprites(struct draw_context *draw, boolean enable)
 463 {
 464    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 465    draw->pipeline.point_sprite = enable;
 466 }
 467
 468
 469 void
 470 draw_set_force_passthrough( struct draw_context *draw, boolean enable )
 471 {
 472    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 473    draw->force_passthrough = enable;
 474 }
 475
 476
 477
 478 /**
 479  * Allocate an extra vertex/geometry shader vertex attribute, if it doesn't
 480  * exist already.
 481  *
 482  * This is used by some of the optional draw module stages such
 483  * as wide_point which may need to allocate additional generic/texcoord
 484  * attributes.
 485  */
 486 int
 487 draw_alloc_extra_vertex_attrib(struct draw_context *draw,
 488                                uint semantic_name, uint semantic_index)
 489 {
 490    int slot;
 491    uint num_outputs;
 492    uint n;
 493
 494    slot = draw_find_shader_output(draw, semantic_name, semantic_index);
 495    if (slot >= 0) {
 496       return slot;
 497    }
 498
 499    num_outputs = draw_current_shader_outputs(draw);
 500    n = draw->extra_shader_outputs.num;
 501
 502    assert(n < Elements(draw->extra_shader_outputs.semantic_name));
 503
 504    draw->extra_shader_outputs.semantic_name[n] = semantic_name;
 505    draw->extra_shader_outputs.semantic_index[n] = semantic_index;
 506    draw->extra_shader_outputs.slot[n] = num_outputs + n;
 507    draw->extra_shader_outputs.num++;
 508
 509    return draw->extra_shader_outputs.slot[n];
 510 }
 511
 512
 513 /**
 514  * Remove all extra vertex attributes that were allocated with
 515  * draw_alloc_extra_vertex_attrib().
 516  */
 517 void
 518 draw_remove_extra_vertex_attribs(struct draw_context *draw)
 519 {
 520    draw->extra_shader_outputs.num = 0;
 521 }
 522
 523
 524 /**
 525  * If a geometry shader is present, return its info, else the vertex shader's
 526  * info.
 527  */
 528 struct tgsi_shader_info *
 529 draw_get_shader_info(const struct draw_context *draw)
 530 {
 531
 532    if (draw->gs.geometry_shader) {
 533       return &draw->gs.geometry_shader->info;
 534    } else {
 535       return &draw->vs.vertex_shader->info;
 536    }
 537 }
 538
 539
 540 /**
 541  * Ask the draw module for the location/slot of the given vertex attribute in
 542  * a post-transformed vertex.
 543  *
 544  * With this function, drivers that use the draw module should have no reason
 545  * to track the current vertex/geometry shader.
 546  *
 547  * Note that the draw module may sometimes generate vertices with extra
 548  * attributes (such as texcoords for AA lines).  The driver can call this
 549  * function to find those attributes.
 550  *
 551  * -1 is returned if the attribute is not found since this is
 552  * an undefined situation. Note, that zero is valid and can
 553  * be used by any of the attributes, because position is not
 554  * required to be attribute 0 or even at all present.
 555  */
 556 int
 557 draw_find_shader_output(const struct draw_context *draw,
 558                         uint semantic_name, uint semantic_index)
 559 {
 560    const struct tgsi_shader_info *info = draw_get_shader_info(draw);
 561    uint i;
 562
 563    for (i = 0; i < info->num_outputs; i++) {
 564       if (info->output_semantic_name[i] == semantic_name &&
 565           info->output_semantic_index[i] == semantic_index)
 566          return i;
 567    }
 568
 569    /* Search the extra vertex attributes */
 570    for (i = 0; i < draw->extra_shader_outputs.num; i++) {
 571       if (draw->extra_shader_outputs.semantic_name[i] == semantic_name &&
 572           draw->extra_shader_outputs.semantic_index[i] == semantic_index) {
 573          return draw->extra_shader_outputs.slot[i];
 574       }
 575    }
 576
 577    return -1;
 578 }
 579
 580
 581 /**
 582  * Return total number of the shader outputs.  This function is similar to
 583  * draw_current_shader_outputs() but this function also counts any extra
 584  * vertex/geometry output attributes that may be filled in by some draw
 585  * stages (such as AA point, AA line).
 586  *
 587  * If geometry shader is present, its output will be returned,
 588  * if not vertex shader is used.
 589  */
 590 uint
 591 draw_num_shader_outputs(const struct draw_context *draw)
 592 {
 593    const struct tgsi_shader_info *info = draw_get_shader_info(draw);
 594    uint count;
 595
 596    count = info->num_outputs;
 597    count += draw->extra_shader_outputs.num;
 598
 599    return count;
 600 }
 601
 602
 603 /**
 604  * Provide TGSI sampler objects for vertex/geometry shaders that use
 605  * texture fetches.  This state only needs to be set once per context.
 606  * This might only be used by software drivers for the time being.
 607  */
 608 void
 609 draw_texture_sampler(struct draw_context *draw,
 610                      uint shader,
 611                      struct tgsi_sampler *sampler)
 612 {
 613    if (shader == PIPE_SHADER_VERTEX) {
 614       draw->vs.tgsi.sampler = sampler;
 615    } else {
 616       debug_assert(shader == PIPE_SHADER_GEOMETRY);
 617       draw->gs.tgsi.sampler = sampler;
 618    }
 619 }
 620
 621
 622
 623
 624 void draw_set_render( struct draw_context *draw,
 625                       struct vbuf_render *render )
 626 {
 627    draw->render = render;
 628 }
 629
 630
 631 /**
 632  * Tell the draw module where vertex indexes/elements are located, and
 633  * their size (in bytes).
 634  *
 635  * Note: the caller must apply the pipe_index_buffer::offset value to
 636  * the address.  The draw module doesn't do that.
 637  */
 638 void
 639 draw_set_indexes(struct draw_context *draw,
 640                  const void *elements, unsigned elem_size,
 641                  unsigned elem_buffer_space)
 642 {
 643    assert(elem_size == 0 ||
 644           elem_size == 1 ||
 645           elem_size == 2 ||
 646           elem_size == 4);
 647    draw->pt.user.elts = elements;
 648    draw->pt.user.eltSizeIB = elem_size;
 649    if (elem_size)
 650       draw->pt.user.eltMax = elem_buffer_space / elem_size;
 651    else
 652       draw->pt.user.eltMax = 0;
 653 }
 654
 655
 656 /* Revamp me please:
 657  */
 658 void draw_do_flush( struct draw_context *draw, unsigned flags )
 659 {
 660    if (!draw->suspend_flushing)
 661    {
 662       assert(!draw->flushing); /* catch inadvertant recursion */
 663
 664       draw->flushing = TRUE;
 665
 666       draw_pipeline_flush( draw, flags );
 667
 668       draw_pt_flush( draw, flags );
 669
 670       draw->flushing = FALSE;
 671    }
 672 }
 673
 674
 675 /**
 676  * Return the number of output attributes produced by the geometry
 677  * shader, if present.  If no geometry shader, return the number of
 678  * outputs from the vertex shader.
 679  * \sa draw_num_shader_outputs
 680  */
 681 uint
 682 draw_current_shader_outputs(const struct draw_context *draw)
 683 {
 684    if (draw->gs.geometry_shader)
 685       return draw->gs.num_gs_outputs;
 686    return draw->vs.num_vs_outputs;
 687 }
 688
 689
 690 /**
 691  * Return the index of the shader output which will contain the
 692  * vertex position.
 693  */
 694 uint
 695 draw_current_shader_position_output(const struct draw_context *draw)
 696 {
 697    if (draw->gs.geometry_shader)
 698       return draw->gs.position_output;
 699    return draw->vs.position_output;
 700 }
 701
 702
 703 /**
 704  * Return the index of the shader output which will contain the
 705  * viewport index.
 706  */
 707 uint
 708 draw_current_shader_viewport_index_output(const struct draw_context *draw)
 709 {
 710    if (draw->gs.geometry_shader)
 711       return draw->gs.geometry_shader->viewport_index_output;
 712    return 0;
 713 }
 714
 715 /**
 716  * Returns true if there's a geometry shader bound and the geometry
 717  * shader writes out a viewport index.
 718  */
 719 boolean
 720 draw_current_shader_uses_viewport_index(const struct draw_context *draw)
 721 {
 722    if (draw->gs.geometry_shader)
 723       return draw->gs.geometry_shader->info.writes_viewport_index;
 724    return FALSE;
 725 }
 726
 727
 728 /**
 729  * Return the index of the shader output which will contain the
 730  * vertex position.
 731  */
 732 uint
 733 draw_current_shader_clipvertex_output(const struct draw_context *draw)
 734 {
 735    return draw->vs.clipvertex_output;
 736 }
 737
 738 uint
 739 draw_current_shader_clipdistance_output(const struct draw_context *draw, int index)
 740 {
 741    if (draw->gs.geometry_shader)
 742       return draw->gs.geometry_shader->clipdistance_output[index];
 743    return draw->vs.clipdistance_output[index];
 744 }
 745
 746
 747 uint
 748 draw_current_shader_num_written_clipdistances(const struct draw_context *draw)
 749 {
 750    if (draw->gs.geometry_shader)
 751       return draw->gs.geometry_shader->info.num_written_clipdistance;
 752    return draw->vs.vertex_shader->info.num_written_clipdistance;
 753 }
 754
 755 /**
 756  * Return a pointer/handle for a driver/CSO rasterizer object which
 757  * disabled culling, stippling, unfilled tris, etc.
 758  * This is used by some pipeline stages (such as wide_point, aa_line
 759  * and aa_point) which convert points/lines into triangles.  In those
 760  * cases we don't want to accidentally cull the triangles.
 761  *
 762  * \param scissor  should the rasterizer state enable scissoring?
 763  * \param flatshade  should the rasterizer state use flat shading?
 764  * \return  rasterizer CSO handle
 765  */
 766 void *
 767 draw_get_rasterizer_no_cull( struct draw_context *draw,
 768                              boolean scissor,
 769                              boolean flatshade )
 770 {
 771    if (!draw->rasterizer_no_cull[scissor][flatshade]) {
 772       /* create now */
 773       struct pipe_context *pipe = draw->pipe;
 774       struct pipe_rasterizer_state rast;
 775
 776       memset(&rast, 0, sizeof(rast));
 777       rast.scissor = scissor;
 778       rast.flatshade = flatshade;
 779       rast.front_ccw = 1;
 780       rast.half_pixel_center = draw->rasterizer->half_pixel_center;
 781       rast.bottom_edge_rule = draw->rasterizer->bottom_edge_rule;
 782       rast.clip_halfz = draw->rasterizer->clip_halfz;
 783
 784       draw->rasterizer_no_cull[scissor][flatshade] =
 785          pipe->create_rasterizer_state(pipe, &rast);
 786    }
 787    return draw->rasterizer_no_cull[scissor][flatshade];
 788 }
 789
 790 void
 791 draw_set_mapped_so_targets(struct draw_context *draw,
 792                            int num_targets,
 793                            struct draw_so_target *targets[PIPE_MAX_SO_BUFFERS])
 794 {
 795    int i;
 796
 797    for (i = 0; i < num_targets; i++)
 798       draw->so.targets[i] = targets[i];
 799    for (i = num_targets; i < PIPE_MAX_SO_BUFFERS; i++)
 800       draw->so.targets[i] = NULL;
 801
 802    draw->so.num_targets = num_targets;
 803 }
 804
 805 void
 806 draw_set_sampler_views(struct draw_context *draw,
 807                        unsigned shader_stage,
 808                        struct pipe_sampler_view **views,
 809                        unsigned num)
 810 {
 811    unsigned i;
 812
 813    debug_assert(shader_stage < PIPE_SHADER_TYPES);
 814    debug_assert(num <= PIPE_MAX_SHADER_SAMPLER_VIEWS);
 815
 816    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 817
 818    for (i = 0; i < num; ++i)
 819       draw->sampler_views[shader_stage][i] = views[i];
 820    for (i = num; i < PIPE_MAX_SHADER_SAMPLER_VIEWS; ++i)
 821       draw->sampler_views[shader_stage][i] = NULL;
 822
 823    draw->num_sampler_views[shader_stage] = num;
 824 }
 825
 826 void
 827 draw_set_samplers(struct draw_context *draw,
 828                   unsigned shader_stage,
 829                   struct pipe_sampler_state **samplers,
 830                   unsigned num)
 831 {
 832    unsigned i;
 833
 834    debug_assert(shader_stage < PIPE_SHADER_TYPES);
 835    debug_assert(num <= PIPE_MAX_SAMPLERS);
 836
 837    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 838
 839    for (i = 0; i < num; ++i)
 840       draw->samplers[shader_stage][i] = samplers[i];
 841    for (i = num; i < PIPE_MAX_SAMPLERS; ++i)
 842       draw->samplers[shader_stage][i] = NULL;
 843
 844    draw->num_samplers[shader_stage] = num;
 845
 846 #ifdef HAVE_LLVM
 847    if (draw->llvm)
 848       draw_llvm_set_sampler_state(draw, shader_stage);
 849 #endif
 850 }
 851
 852 void
 853 draw_set_mapped_texture(struct draw_context *draw,
 854                         unsigned shader_stage,
 855                         unsigned sview_idx,
 856                         uint32_t width, uint32_t height, uint32_t depth,
 857                         uint32_t first_level, uint32_t last_level,
 858                         const void *base_ptr,
 859                         uint32_t row_stride[PIPE_MAX_TEXTURE_LEVELS],
 860                         uint32_t img_stride[PIPE_MAX_TEXTURE_LEVELS],
 861                         uint32_t mip_offsets[PIPE_MAX_TEXTURE_LEVELS])
 862 {
 863 #ifdef HAVE_LLVM
 864    if (draw->llvm)
 865       draw_llvm_set_mapped_texture(draw,
 866                                    shader_stage,
 867                                    sview_idx,
 868                                    width, height, depth, first_level,
 869                                    last_level, base_ptr,
 870                                    row_stride, img_stride, mip_offsets);
 871 #endif
 872 }
 873
 874 /**
 875  * XXX: Results for PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS because there are two
 876  * different ways of setting textures, and drivers typically only support one.
 877  */
 878 int
 879 draw_get_shader_param_no_llvm(unsigned shader, enum pipe_shader_cap param)
 880 {
 881    switch(shader) {
 882    case PIPE_SHADER_VERTEX:
 883    case PIPE_SHADER_GEOMETRY:
 884       return tgsi_exec_get_shader_param(param);
 885    default:
 886       return 0;
 887    }
 888 }
 889
 890 /**
 891  * XXX: Results for PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS because there are two
 892  * different ways of setting textures, and drivers typically only support one.
 893  */
 894 int
 895 draw_get_shader_param(unsigned shader, enum pipe_shader_cap param)
 896 {
 897
 898 #ifdef HAVE_LLVM
 899    if (draw_get_option_use_llvm()) {
 900       switch(shader) {
 901       case PIPE_SHADER_VERTEX:
 902       case PIPE_SHADER_GEOMETRY:
 903          return gallivm_get_shader_param(param);
 904       default:
 905          return 0;
 906       }
 907    }
 908 #endif
 909
 910    return draw_get_shader_param_no_llvm(shader, param);
 911 }
 912
 913 /**
 914  * Enables or disables collection of statistics.
 915  *
 916  * Draw module is capable of generating statistics for the vertex
 917  * processing pipeline. Collection of that data isn't free and so
 918  * it's disabled by default. The users of the module can enable
 919  * (or disable) this functionality through this function.
 920  * The actual data will be emitted through the VBUF interface,
 921  * the 'pipeline_statistics' callback to be exact.
 922  */
 923 void
 924 draw_collect_pipeline_statistics(struct draw_context *draw,
 925                                  boolean enable)
 926 {
 927    draw->collect_statistics = enable;
 928 }
 929
 930 /**
 931  * Computes clipper invocation statistics.
 932  *
 933  * Figures out how many primitives would have been
 934  * sent to the clipper given the specified
 935  * prim info data.
 936  */
 937 void
 938 draw_stats_clipper_primitives(struct draw_context *draw,
 939                               const struct draw_prim_info *prim_info)
 940 {
 941    if (draw->collect_statistics) {
 942       unsigned start, i;
 943       for (start = i = 0;
 944            i < prim_info->primitive_count;
 945            start += prim_info->primitive_lengths[i], i++)
 946       {
 947          draw->statistics.c_invocations +=
 948             u_decomposed_prims_for_vertices(prim_info->prim,
 949                                             prim_info->primitive_lengths[i]);
 950       }
 951    }
 952 }