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_pipe.h"
  43 #include "draw_prim_assembler.h"
  44 #include "draw_vs.h"
  45 #include "draw_gs.h"
  46
  47 #if HAVE_LLVM
  48 #include "gallivm/lp_bld_init.h"
  49 #include "gallivm/lp_bld_limits.h"
  50 #include "draw_llvm.h"
  51
  52 boolean
  53 draw_get_option_use_llvm(void)
  54 {
  55    static boolean first = TRUE;
  56    static boolean value;
  57    if (first) {
  58       first = FALSE;
  59       value = debug_get_bool_option("DRAW_USE_LLVM", TRUE);
  60
  61 #ifdef PIPE_ARCH_X86
  62       util_cpu_detect();
  63       /* require SSE2 due to LLVM PR6960. XXX Might be fixed by now? */
  64       if (!util_cpu_caps.has_sse2)
  65          value = FALSE;
  66 #endif
  67    }
  68    return value;
  69 }
  70 #endif
  71
  72
  73 /**
  74  * Create new draw module context with gallivm state for LLVM JIT.
  75  */
  76 static struct draw_context *
  77 draw_create_context(struct pipe_context *pipe, boolean try_llvm)
  78 {
  79    struct draw_context *draw = CALLOC_STRUCT( draw_context );
  80    if (draw == NULL)
  81       goto err_out;
  82
  83    /* we need correct cpu caps for disabling denorms in draw_vbo() */
  84    util_cpu_detect();
  85
  86 #if HAVE_LLVM
  87    if (try_llvm && draw_get_option_use_llvm()) {
  88       draw->llvm = draw_llvm_create(draw);
  89       if (!draw->llvm)
  90          goto err_destroy;
  91    }
  92 #endif
  93
  94    draw->pipe = pipe;
  95
  96    if (!draw_init(draw))
  97       goto err_destroy;
  98
  99    draw->ia = draw_prim_assembler_create(draw);
 100    if (!draw->ia)
 101       goto err_destroy;
 102
 103    return draw;
 104
 105 err_destroy:
 106    draw_destroy( draw );
 107 err_out:
 108    return NULL;
 109 }
 110
 111
 112 /**
 113  * Create new draw module context, with LLVM JIT.
 114  */
 115 struct draw_context *
 116 draw_create(struct pipe_context *pipe)
 117 {
 118    return draw_create_context(pipe, TRUE);
 119 }
 120
 121
 122 /**
 123  * Create a new draw context, without LLVM JIT.
 124  */
 125 struct draw_context *
 126 draw_create_no_llvm(struct pipe_context *pipe)
 127 {
 128    return draw_create_context(pipe, FALSE);
 129 }
 130
 131
 132 boolean draw_init(struct draw_context *draw)
 133 {
 134    /*
 135     * Note that several functions compute the clipmask of the predefined
 136     * formats with hardcoded formulas instead of using these. So modifications
 137     * here must be reflected there too.
 138     */
 139
 140    ASSIGN_4V( draw->plane[0], -1,  0,  0, 1 );
 141    ASSIGN_4V( draw->plane[1],  1,  0,  0, 1 );
 142    ASSIGN_4V( draw->plane[2],  0, -1,  0, 1 );
 143    ASSIGN_4V( draw->plane[3],  0,  1,  0, 1 );
 144    ASSIGN_4V( draw->plane[4],  0,  0,  1, 1 ); /* yes these are correct */
 145    ASSIGN_4V( draw->plane[5],  0,  0, -1, 1 ); /* mesa's a bit wonky */
 146    draw->clip_xy = TRUE;
 147    draw->clip_z = TRUE;
 148
 149    draw->pt.user.planes = (float (*) [DRAW_TOTAL_CLIP_PLANES][4]) &(draw->plane[0]);
 150    draw->pt.user.eltMax = ~0;
 151
 152    if (!draw_pipeline_init( draw ))
 153       return FALSE;
 154
 155    if (!draw_pt_init( draw ))
 156       return FALSE;
 157
 158    if (!draw_vs_init( draw ))
 159       return FALSE;
 160
 161    if (!draw_gs_init( draw ))
 162       return FALSE;
 163
 164    draw->quads_always_flatshade_last = !draw->pipe->screen->get_param(
 165       draw->pipe->screen, PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION);
 166
 167    return TRUE;
 168 }
 169
 170 /*
 171  * Called whenever we're starting to draw a new instance.
 172  * Some internal structures don't want to have to reset internal
 173  * members on each invocation (because their state might have to persist
 174  * between multiple primitive restart rendering call) but might have to
 175  * for each new instance.
 176  * This is particularly the case for primitive id's in geometry shader.
 177  */
 178 void draw_new_instance(struct draw_context *draw)
 179 {
 180    draw_geometry_shader_new_instance(draw->gs.geometry_shader);
 181 }
 182
 183
 184 void draw_destroy( struct draw_context *draw )
 185 {
 186    struct pipe_context *pipe;
 187    unsigned i, j;
 188
 189    if (!draw)
 190       return;
 191
 192    pipe = draw->pipe;
 193
 194    /* free any rasterizer CSOs that we may have created.
 195     */
 196    for (i = 0; i < 2; i++) {
 197       for (j = 0; j < 2; j++) {
 198          if (draw->rasterizer_no_cull[i][j]) {
 199             pipe->delete_rasterizer_state(pipe, draw->rasterizer_no_cull[i][j]);
 200          }
 201       }
 202    }
 203
 204    for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 205       pipe_resource_reference(&draw->pt.vertex_buffer[i].buffer, NULL);
 206    }
 207
 208    /* Not so fast -- we're just borrowing this at the moment.
 209     *
 210    if (draw->render)
 211       draw->render->destroy( draw->render );
 212    */
 213
 214    draw_prim_assembler_destroy(draw->ia);
 215    draw_pipeline_destroy( draw );
 216    draw_pt_destroy( draw );
 217    draw_vs_destroy( draw );
 218    draw_gs_destroy( draw );
 219 #ifdef HAVE_LLVM
 220    if (draw->llvm)
 221       draw_llvm_destroy( draw->llvm );
 222 #endif
 223
 224    FREE( draw );
 225 }
 226
 227
 228
 229 void draw_flush( struct draw_context *draw )
 230 {
 231    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 232 }
 233
 234
 235 /**
 236  * Specify the Minimum Resolvable Depth factor for polygon offset.
 237  * This factor potentially depends on the number of Z buffer bits,
 238  * the rasterization algorithm and the arithmetic performed on Z
 239  * values between vertex shading and rasterization.  It will vary
 240  * from one driver to another.
 241  */
 242 void draw_set_mrd(struct draw_context *draw, double mrd)
 243 {
 244    draw->mrd = mrd;
 245 }
 246
 247
 248 static void update_clip_flags( struct draw_context *draw )
 249 {
 250    draw->clip_xy = !draw->driver.bypass_clip_xy;
 251    draw->guard_band_xy = (!draw->driver.bypass_clip_xy &&
 252                           draw->driver.guard_band_xy);
 253    draw->clip_z = (!draw->driver.bypass_clip_z &&
 254                    draw->rasterizer && draw->rasterizer->depth_clip);
 255    draw->clip_user = draw->rasterizer &&
 256                      draw->rasterizer->clip_plane_enable != 0;
 257 }
 258
 259 /**
 260  * Register new primitive rasterization/rendering state.
 261  * This causes the drawing pipeline to be rebuilt.
 262  */
 263 void draw_set_rasterizer_state( struct draw_context *draw,
 264                                 const struct pipe_rasterizer_state *raster,
 265                                 void *rast_handle )
 266 {
 267    if (!draw->suspend_flushing) {
 268       draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 269
 270       draw->rasterizer = raster;
 271       draw->rast_handle = rast_handle;
 272       update_clip_flags(draw);
 273    }
 274 }
 275
 276 /* With a little more work, llvmpipe will be able to turn this off and
 277  * do its own x/y clipping.
 278  *
 279  * Some hardware can turn off clipping altogether - in particular any
 280  * hardware with a TNL unit can do its own clipping, even if it is
 281  * relying on the draw module for some other reason.
 282  */
 283 void draw_set_driver_clipping( struct draw_context *draw,
 284                                boolean bypass_clip_xy,
 285                                boolean bypass_clip_z,
 286                                boolean guard_band_xy)
 287 {
 288    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 289
 290    draw->driver.bypass_clip_xy = bypass_clip_xy;
 291    draw->driver.bypass_clip_z = bypass_clip_z;
 292    draw->driver.guard_band_xy = guard_band_xy;
 293    update_clip_flags(draw);
 294 }
 295
 296
 297 /**
 298  * Plug in the primitive rendering/rasterization stage (which is the last
 299  * stage in the drawing pipeline).
 300  * This is provided by the device driver.
 301  */
 302 void draw_set_rasterize_stage( struct draw_context *draw,
 303                                struct draw_stage *stage )
 304 {
 305    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 306
 307    draw->pipeline.rasterize = stage;
 308 }
 309
 310
 311 /**
 312  * Set the draw module's clipping state.
 313  */
 314 void draw_set_clip_state( struct draw_context *draw,
 315                           const struct pipe_clip_state *clip )
 316 {
 317    draw_do_flush(draw, DRAW_FLUSH_PARAMETER_CHANGE);
 318
 319    memcpy(&draw->plane[6], clip->ucp, sizeof(clip->ucp));
 320 }
 321
 322
 323 /**
 324  * Set the draw module's viewport state.
 325  */
 326 void draw_set_viewport_states( struct draw_context *draw,
 327                                unsigned start_slot,
 328                                unsigned num_viewports,
 329                                const struct pipe_viewport_state *vps )
 330 {
 331    const struct pipe_viewport_state *viewport = vps;
 332    draw_do_flush(draw, DRAW_FLUSH_PARAMETER_CHANGE);
 333
 334    debug_assert(start_slot < PIPE_MAX_VIEWPORTS);
 335    debug_assert((start_slot + num_viewports) <= PIPE_MAX_VIEWPORTS);
 336
 337    memcpy(draw->viewports + start_slot, vps,
 338           sizeof(struct pipe_viewport_state) * num_viewports);
 339
 340    draw->identity_viewport = (num_viewports == 1) &&
 341       (viewport->scale[0] == 1.0f &&
 342        viewport->scale[1] == 1.0f &&
 343        viewport->scale[2] == 1.0f &&
 344        viewport->scale[3] == 1.0f &&
 345        viewport->translate[0] == 0.0f &&
 346        viewport->translate[1] == 0.0f &&
 347        viewport->translate[2] == 0.0f &&
 348        viewport->translate[3] == 0.0f);
 349 }
 350
 351
 352
 353 void
 354 draw_set_vertex_buffers(struct draw_context *draw,
 355                         unsigned start_slot, unsigned count,
 356                         const struct pipe_vertex_buffer *buffers)
 357 {
 358    assert(start_slot + count <= PIPE_MAX_ATTRIBS);
 359
 360    util_set_vertex_buffers_count(draw->pt.vertex_buffer,
 361                                  &draw->pt.nr_vertex_buffers,
 362                                  buffers, start_slot, count);
 363 }
 364
 365
 366 void
 367 draw_set_vertex_elements(struct draw_context *draw,
 368                          unsigned count,
 369                          const struct pipe_vertex_element *elements)
 370 {
 371    assert(count <= PIPE_MAX_ATTRIBS);
 372
 373    /* We could improve this by only flushing the frontend and the fetch part
 374     * of the middle. This would avoid recalculating the emit keys.*/
 375    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 376
 377    memcpy(draw->pt.vertex_element, elements, count * sizeof(elements[0]));
 378    draw->pt.nr_vertex_elements = count;
 379 }
 380
 381
 382 /**
 383  * Tell drawing context where to find mapped vertex buffers.
 384  */
 385 void
 386 draw_set_mapped_vertex_buffer(struct draw_context *draw,
 387                               unsigned attr, const void *buffer,
 388                               size_t size)
 389 {
 390    draw->pt.user.vbuffer[attr].map  = buffer;
 391    draw->pt.user.vbuffer[attr].size = size;
 392 }
 393
 394
 395 void
 396 draw_set_mapped_constant_buffer(struct draw_context *draw,
 397                                 unsigned shader_type,
 398                                 unsigned slot,
 399                                 const void *buffer,
 400                                 unsigned size )
 401 {
 402    debug_assert(shader_type == PIPE_SHADER_VERTEX ||
 403                 shader_type == PIPE_SHADER_GEOMETRY);
 404    debug_assert(slot < PIPE_MAX_CONSTANT_BUFFERS);
 405
 406    draw_do_flush(draw, DRAW_FLUSH_PARAMETER_CHANGE);
 407
 408    switch (shader_type) {
 409    case PIPE_SHADER_VERTEX:
 410       draw->pt.user.vs_constants[slot] = buffer;
 411       draw->pt.user.vs_constants_size[slot] = size;
 412       break;
 413    case PIPE_SHADER_GEOMETRY:
 414       draw->pt.user.gs_constants[slot] = buffer;
 415       draw->pt.user.gs_constants_size[slot] = size;
 416       break;
 417    default:
 418       assert(0 && "invalid shader type in draw_set_mapped_constant_buffer");
 419    }
 420 }
 421
 422
 423 /**
 424  * Tells the draw module to draw points with triangles if their size
 425  * is greater than this threshold.
 426  */
 427 void
 428 draw_wide_point_threshold(struct draw_context *draw, float threshold)
 429 {
 430    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 431    draw->pipeline.wide_point_threshold = threshold;
 432 }
 433
 434
 435 /**
 436  * Should the draw module handle point->quad conversion for drawing sprites?
 437  */
 438 void
 439 draw_wide_point_sprites(struct draw_context *draw, boolean draw_sprite)
 440 {
 441    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 442    draw->pipeline.wide_point_sprites = draw_sprite;
 443 }
 444
 445
 446 /**
 447  * Tells the draw module to draw lines with triangles if their width
 448  * is greater than this threshold.
 449  */
 450 void
 451 draw_wide_line_threshold(struct draw_context *draw, float threshold)
 452 {
 453    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 454    draw->pipeline.wide_line_threshold = roundf(threshold);
 455 }
 456
 457
 458 /**
 459  * Tells the draw module whether or not to implement line stipple.
 460  */
 461 void
 462 draw_enable_line_stipple(struct draw_context *draw, boolean enable)
 463 {
 464    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 465    draw->pipeline.line_stipple = enable;
 466 }
 467
 468
 469 /**
 470  * Tells draw module whether to convert points to quads for sprite mode.
 471  */
 472 void
 473 draw_enable_point_sprites(struct draw_context *draw, boolean enable)
 474 {
 475    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 476    draw->pipeline.point_sprite = enable;
 477 }
 478
 479
 480 void
 481 draw_set_force_passthrough( struct draw_context *draw, boolean enable )
 482 {
 483    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 484    draw->force_passthrough = enable;
 485 }
 486
 487
 488
 489 /**
 490  * Allocate an extra vertex/geometry shader vertex attribute, if it doesn't
 491  * exist already.
 492  *
 493  * This is used by some of the optional draw module stages such
 494  * as wide_point which may need to allocate additional generic/texcoord
 495  * attributes.
 496  */
 497 int
 498 draw_alloc_extra_vertex_attrib(struct draw_context *draw,
 499                                uint semantic_name, uint semantic_index)
 500 {
 501    int slot;
 502    uint num_outputs;
 503    uint n;
 504
 505    slot = draw_find_shader_output(draw, semantic_name, semantic_index);
 506    if (slot >= 0) {
 507       return slot;
 508    }
 509
 510    num_outputs = draw_current_shader_outputs(draw);
 511    n = draw->extra_shader_outputs.num;
 512
 513    assert(n < Elements(draw->extra_shader_outputs.semantic_name));
 514
 515    draw->extra_shader_outputs.semantic_name[n] = semantic_name;
 516    draw->extra_shader_outputs.semantic_index[n] = semantic_index;
 517    draw->extra_shader_outputs.slot[n] = num_outputs + n;
 518    draw->extra_shader_outputs.num++;
 519
 520    return draw->extra_shader_outputs.slot[n];
 521 }
 522
 523
 524 /**
 525  * Remove all extra vertex attributes that were allocated with
 526  * draw_alloc_extra_vertex_attrib().
 527  */
 528 void
 529 draw_remove_extra_vertex_attribs(struct draw_context *draw)
 530 {
 531    draw->extra_shader_outputs.num = 0;
 532 }
 533
 534
 535 /**
 536  * If a geometry shader is present, return its info, else the vertex shader's
 537  * info.
 538  */
 539 struct tgsi_shader_info *
 540 draw_get_shader_info(const struct draw_context *draw)
 541 {
 542
 543    if (draw->gs.geometry_shader) {
 544       return &draw->gs.geometry_shader->info;
 545    } else {
 546       return &draw->vs.vertex_shader->info;
 547    }
 548 }
 549
 550 /**
 551  * Prepare outputs slots from the draw module
 552  *
 553  * Certain parts of the draw module can emit additional
 554  * outputs that can be quite useful to the backends, a good
 555  * example of it is the process of decomposing primitives
 556  * into wireframes (aka. lines) which normally would lose
 557  * the face-side information, but using this method we can
 558  * inject another shader output which passes the original
 559  * face side information to the backend.
 560  */
 561 void
 562 draw_prepare_shader_outputs(struct draw_context *draw)
 563 {
 564    draw_remove_extra_vertex_attribs(draw);
 565    draw_prim_assembler_prepare_outputs(draw->ia);
 566    draw_unfilled_prepare_outputs(draw, draw->pipeline.unfilled);
 567    draw_aapoint_prepare_outputs(draw, draw->pipeline.aapoint);
 568    draw_aaline_prepare_outputs(draw, draw->pipeline.aaline);
 569 }
 570
 571 /**
 572  * Ask the draw module for the location/slot of the given vertex attribute in
 573  * a post-transformed vertex.
 574  *
 575  * With this function, drivers that use the draw module should have no reason
 576  * to track the current vertex/geometry shader.
 577  *
 578  * Note that the draw module may sometimes generate vertices with extra
 579  * attributes (such as texcoords for AA lines).  The driver can call this
 580  * function to find those attributes.
 581  *
 582  * -1 is returned if the attribute is not found since this is
 583  * an undefined situation. Note, that zero is valid and can
 584  * be used by any of the attributes, because position is not
 585  * required to be attribute 0 or even at all present.
 586  */
 587 int
 588 draw_find_shader_output(const struct draw_context *draw,
 589                         uint semantic_name, uint semantic_index)
 590 {
 591    const struct tgsi_shader_info *info = draw_get_shader_info(draw);
 592    uint i;
 593
 594    for (i = 0; i < info->num_outputs; i++) {
 595       if (info->output_semantic_name[i] == semantic_name &&
 596           info->output_semantic_index[i] == semantic_index)
 597          return i;
 598    }
 599
 600    /* Search the extra vertex attributes */
 601    for (i = 0; i < draw->extra_shader_outputs.num; i++) {
 602       if (draw->extra_shader_outputs.semantic_name[i] == semantic_name &&
 603           draw->extra_shader_outputs.semantic_index[i] == semantic_index) {
 604          return draw->extra_shader_outputs.slot[i];
 605       }
 606    }
 607
 608    return -1;
 609 }
 610
 611
 612 /**
 613  * Return total number of the shader outputs.  This function is similar to
 614  * draw_current_shader_outputs() but this function also counts any extra
 615  * vertex/geometry output attributes that may be filled in by some draw
 616  * stages (such as AA point, AA line).
 617  *
 618  * If geometry shader is present, its output will be returned,
 619  * if not vertex shader is used.
 620  */
 621 uint
 622 draw_num_shader_outputs(const struct draw_context *draw)
 623 {
 624    const struct tgsi_shader_info *info = draw_get_shader_info(draw);
 625    uint count;
 626
 627    count = info->num_outputs;
 628    count += draw->extra_shader_outputs.num;
 629
 630    return count;
 631 }
 632
 633
 634 /**
 635  * Return total number of the vertex shader outputs.  This function
 636  * also counts any extra vertex output attributes that may
 637  * be filled in by some draw stages (such as AA point, AA line,
 638  * front face).
 639  */
 640 uint
 641 draw_total_vs_outputs(const struct draw_context *draw)
 642 {
 643    const struct tgsi_shader_info *info = &draw->vs.vertex_shader->info;
 644
 645    return info->num_outputs + draw->extra_shader_outputs.num;;
 646 }
 647
 648 /**
 649  * Return total number of the geometry shader outputs. This function
 650  * also counts any extra geometry output attributes that may
 651  * be filled in by some draw stages (such as AA point, AA line, front
 652  * face).
 653  */
 654 uint
 655 draw_total_gs_outputs(const struct draw_context *draw)
 656 {
 657    const struct tgsi_shader_info *info;
 658
 659    if (!draw->gs.geometry_shader)
 660       return 0;
 661
 662    info = &draw->gs.geometry_shader->info;
 663
 664    return info->num_outputs + draw->extra_shader_outputs.num;
 665 }
 666
 667
 668 /**
 669  * Provide TGSI sampler objects for vertex/geometry shaders that use
 670  * texture fetches.  This state only needs to be set once per context.
 671  * This might only be used by software drivers for the time being.
 672  */
 673 void
 674 draw_texture_sampler(struct draw_context *draw,
 675                      uint shader,
 676                      struct tgsi_sampler *sampler)
 677 {
 678    if (shader == PIPE_SHADER_VERTEX) {
 679       draw->vs.tgsi.sampler = sampler;
 680    } else {
 681       debug_assert(shader == PIPE_SHADER_GEOMETRY);
 682       draw->gs.tgsi.sampler = sampler;
 683    }
 684 }
 685
 686
 687
 688
 689 void draw_set_render( struct draw_context *draw,
 690                       struct vbuf_render *render )
 691 {
 692    draw->render = render;
 693 }
 694
 695
 696 /**
 697  * Tell the draw module where vertex indexes/elements are located, and
 698  * their size (in bytes).
 699  *
 700  * Note: the caller must apply the pipe_index_buffer::offset value to
 701  * the address.  The draw module doesn't do that.
 702  */
 703 void
 704 draw_set_indexes(struct draw_context *draw,
 705                  const void *elements, unsigned elem_size,
 706                  unsigned elem_buffer_space)
 707 {
 708    assert(elem_size == 0 ||
 709           elem_size == 1 ||
 710           elem_size == 2 ||
 711           elem_size == 4);
 712    draw->pt.user.elts = elements;
 713    draw->pt.user.eltSizeIB = elem_size;
 714    if (elem_size)
 715       draw->pt.user.eltMax = elem_buffer_space / elem_size;
 716    else
 717       draw->pt.user.eltMax = 0;
 718 }
 719
 720
 721 /* Revamp me please:
 722  */
 723 void draw_do_flush( struct draw_context *draw, unsigned flags )
 724 {
 725    if (!draw->suspend_flushing)
 726    {
 727       assert(!draw->flushing); /* catch inadvertant recursion */
 728
 729       draw->flushing = TRUE;
 730
 731       draw_pipeline_flush( draw, flags );
 732
 733       draw_pt_flush( draw, flags );
 734
 735       draw->flushing = FALSE;
 736    }
 737 }
 738
 739
 740 /**
 741  * Return the number of output attributes produced by the geometry
 742  * shader, if present.  If no geometry shader, return the number of
 743  * outputs from the vertex shader.
 744  * \sa draw_num_shader_outputs
 745  */
 746 uint
 747 draw_current_shader_outputs(const struct draw_context *draw)
 748 {
 749    if (draw->gs.geometry_shader)
 750       return draw->gs.num_gs_outputs;
 751    return draw->vs.num_vs_outputs;
 752 }
 753
 754
 755 /**
 756  * Return the index of the shader output which will contain the
 757  * vertex position.
 758  */
 759 uint
 760 draw_current_shader_position_output(const struct draw_context *draw)
 761 {
 762    if (draw->gs.geometry_shader)
 763       return draw->gs.position_output;
 764    return draw->vs.position_output;
 765 }
 766
 767
 768 /**
 769  * Return the index of the shader output which will contain the
 770  * viewport index.
 771  */
 772 uint
 773 draw_current_shader_viewport_index_output(const struct draw_context *draw)
 774 {
 775    if (draw->gs.geometry_shader)
 776       return draw->gs.geometry_shader->viewport_index_output;
 777    return 0;
 778 }
 779
 780 /**
 781  * Returns true if there's a geometry shader bound and the geometry
 782  * shader writes out a viewport index.
 783  */
 784 boolean
 785 draw_current_shader_uses_viewport_index(const struct draw_context *draw)
 786 {
 787    if (draw->gs.geometry_shader)
 788       return draw->gs.geometry_shader->info.writes_viewport_index;
 789    return FALSE;
 790 }
 791
 792
 793 /**
 794  * Return the index of the shader output which will contain the
 795  * vertex position.
 796  */
 797 uint
 798 draw_current_shader_clipvertex_output(const struct draw_context *draw)
 799 {
 800    return draw->vs.clipvertex_output;
 801 }
 802
 803 uint
 804 draw_current_shader_clipdistance_output(const struct draw_context *draw, int index)
 805 {
 806    debug_assert(index < PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT);
 807    if (draw->gs.geometry_shader)
 808       return draw->gs.geometry_shader->clipdistance_output[index];
 809    return draw->vs.clipdistance_output[index];
 810 }
 811
 812
 813 uint
 814 draw_current_shader_num_written_clipdistances(const struct draw_context *draw)
 815 {
 816    if (draw->gs.geometry_shader)
 817       return draw->gs.geometry_shader->info.num_written_clipdistance;
 818    return draw->vs.vertex_shader->info.num_written_clipdistance;
 819 }
 820
 821
 822 uint
 823 draw_current_shader_culldistance_output(const struct draw_context *draw, int index)
 824 {
 825    debug_assert(index < PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT);
 826    if (draw->gs.geometry_shader)
 827       return draw->gs.geometry_shader->culldistance_output[index];
 828    return draw->vs.vertex_shader->culldistance_output[index];
 829 }
 830
 831 uint
 832 draw_current_shader_num_written_culldistances(const struct draw_context *draw)
 833 {
 834    if (draw->gs.geometry_shader)
 835       return draw->gs.geometry_shader->info.num_written_culldistance;
 836    return draw->vs.vertex_shader->info.num_written_culldistance;
 837 }
 838
 839 /**
 840  * Return a pointer/handle for a driver/CSO rasterizer object which
 841  * disabled culling, stippling, unfilled tris, etc.
 842  * This is used by some pipeline stages (such as wide_point, aa_line
 843  * and aa_point) which convert points/lines into triangles.  In those
 844  * cases we don't want to accidentally cull the triangles.
 845  *
 846  * \param scissor  should the rasterizer state enable scissoring?
 847  * \param flatshade  should the rasterizer state use flat shading?
 848  * \return  rasterizer CSO handle
 849  */
 850 void *
 851 draw_get_rasterizer_no_cull( struct draw_context *draw,
 852                              boolean scissor,
 853                              boolean flatshade )
 854 {
 855    if (!draw->rasterizer_no_cull[scissor][flatshade]) {
 856       /* create now */
 857       struct pipe_context *pipe = draw->pipe;
 858       struct pipe_rasterizer_state rast;
 859
 860       memset(&rast, 0, sizeof(rast));
 861       rast.scissor = scissor;
 862       rast.flatshade = flatshade;
 863       rast.front_ccw = 1;
 864       rast.half_pixel_center = draw->rasterizer->half_pixel_center;
 865       rast.bottom_edge_rule = draw->rasterizer->bottom_edge_rule;
 866       rast.clip_halfz = draw->rasterizer->clip_halfz;
 867
 868       draw->rasterizer_no_cull[scissor][flatshade] =
 869          pipe->create_rasterizer_state(pipe, &rast);
 870    }
 871    return draw->rasterizer_no_cull[scissor][flatshade];
 872 }
 873
 874 void
 875 draw_set_mapped_so_targets(struct draw_context *draw,
 876                            int num_targets,
 877                            struct draw_so_target *targets[PIPE_MAX_SO_BUFFERS])
 878 {
 879    int i;
 880
 881    for (i = 0; i < num_targets; i++)
 882       draw->so.targets[i] = targets[i];
 883    for (i = num_targets; i < PIPE_MAX_SO_BUFFERS; i++)
 884       draw->so.targets[i] = NULL;
 885
 886    draw->so.num_targets = num_targets;
 887 }
 888
 889 void
 890 draw_set_sampler_views(struct draw_context *draw,
 891                        unsigned shader_stage,
 892                        struct pipe_sampler_view **views,
 893                        unsigned num)
 894 {
 895    unsigned i;
 896
 897    debug_assert(shader_stage < PIPE_SHADER_TYPES);
 898    debug_assert(num <= PIPE_MAX_SHADER_SAMPLER_VIEWS);
 899
 900    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 901
 902    for (i = 0; i < num; ++i)
 903       draw->sampler_views[shader_stage][i] = views[i];
 904    for (i = num; i < PIPE_MAX_SHADER_SAMPLER_VIEWS; ++i)
 905       draw->sampler_views[shader_stage][i] = NULL;
 906
 907    draw->num_sampler_views[shader_stage] = num;
 908 }
 909
 910 void
 911 draw_set_samplers(struct draw_context *draw,
 912                   unsigned shader_stage,
 913                   struct pipe_sampler_state **samplers,
 914                   unsigned num)
 915 {
 916    unsigned i;
 917
 918    debug_assert(shader_stage < PIPE_SHADER_TYPES);
 919    debug_assert(num <= PIPE_MAX_SAMPLERS);
 920
 921    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 922
 923    for (i = 0; i < num; ++i)
 924       draw->samplers[shader_stage][i] = samplers[i];
 925    for (i = num; i < PIPE_MAX_SAMPLERS; ++i)
 926       draw->samplers[shader_stage][i] = NULL;
 927
 928    draw->num_samplers[shader_stage] = num;
 929
 930 #ifdef HAVE_LLVM
 931    if (draw->llvm)
 932       draw_llvm_set_sampler_state(draw, shader_stage);
 933 #endif
 934 }
 935
 936 void
 937 draw_set_mapped_texture(struct draw_context *draw,
 938                         unsigned shader_stage,
 939                         unsigned sview_idx,
 940                         uint32_t width, uint32_t height, uint32_t depth,
 941                         uint32_t first_level, uint32_t last_level,
 942                         const void *base_ptr,
 943                         uint32_t row_stride[PIPE_MAX_TEXTURE_LEVELS],
 944                         uint32_t img_stride[PIPE_MAX_TEXTURE_LEVELS],
 945                         uint32_t mip_offsets[PIPE_MAX_TEXTURE_LEVELS])
 946 {
 947 #ifdef HAVE_LLVM
 948    if (draw->llvm)
 949       draw_llvm_set_mapped_texture(draw,
 950                                    shader_stage,
 951                                    sview_idx,
 952                                    width, height, depth, first_level,
 953                                    last_level, base_ptr,
 954                                    row_stride, img_stride, mip_offsets);
 955 #endif
 956 }
 957
 958 /**
 959  * XXX: Results for PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS because there are two
 960  * different ways of setting textures, and drivers typically only support one.
 961  */
 962 int
 963 draw_get_shader_param_no_llvm(unsigned shader, enum pipe_shader_cap param)
 964 {
 965    switch(shader) {
 966    case PIPE_SHADER_VERTEX:
 967    case PIPE_SHADER_GEOMETRY:
 968       return tgsi_exec_get_shader_param(param);
 969    default:
 970       return 0;
 971    }
 972 }
 973
 974 /**
 975  * XXX: Results for PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS because there are two
 976  * different ways of setting textures, and drivers typically only support one.
 977  */
 978 int
 979 draw_get_shader_param(unsigned shader, enum pipe_shader_cap param)
 980 {
 981
 982 #ifdef HAVE_LLVM
 983    if (draw_get_option_use_llvm()) {
 984       switch(shader) {
 985       case PIPE_SHADER_VERTEX:
 986       case PIPE_SHADER_GEOMETRY:
 987          return gallivm_get_shader_param(param);
 988       default:
 989          return 0;
 990       }
 991    }
 992 #endif
 993
 994    return draw_get_shader_param_no_llvm(shader, param);
 995 }
 996
 997 /**
 998  * Enables or disables collection of statistics.
 999  *
1000  * Draw module is capable of generating statistics for the vertex
1001  * processing pipeline. Collection of that data isn't free and so
1002  * it's disabled by default. The users of the module can enable
1003  * (or disable) this functionality through this function.
1004  * The actual data will be emitted through the VBUF interface,
1005  * the 'pipeline_statistics' callback to be exact.
1006  */
1007 void
1008 draw_collect_pipeline_statistics(struct draw_context *draw,
1009                                  boolean enable)
1010 {
1011    draw->collect_statistics = enable;
1012 }
1013
1014 /**
1015  * Computes clipper invocation statistics.
1016  *
1017  * Figures out how many primitives would have been
1018  * sent to the clipper given the specified
1019  * prim info data.
1020  */
1021 void
1022 draw_stats_clipper_primitives(struct draw_context *draw,
1023                               const struct draw_prim_info *prim_info)
1024 {
1025    if (draw->collect_statistics) {
1026       unsigned start, i;
1027       for (start = i = 0;
1028            i < prim_info->primitive_count;
1029            start += prim_info->primitive_lengths[i], i++)
1030       {
1031          draw->statistics.c_invocations +=
1032             u_decomposed_prims_for_vertices(prim_info->prim,
1033                                             prim_info->primitive_lengths[i]);
1034       }
1035    }
1036 }
1037
1038
1039 /**
1040  * Returns true if the draw module will inject the frontface
1041  * info into the outputs.
1042  *
1043  * Given the specified primitive and rasterizer state
1044  * the function will figure out if the draw module
1045  * will inject the front-face information into shader
1046  * outputs. This is done to preserve the front-facing
1047  * info when decomposing primitives into wireframes.
1048  */
1049 boolean
1050 draw_will_inject_frontface(const struct draw_context *draw)
1051 {
1052    unsigned reduced_prim = u_reduced_prim(draw->pt.prim);
1053    const struct pipe_rasterizer_state *rast = draw->rasterizer;
1054
1055    if (reduced_prim != PIPE_PRIM_TRIANGLES) {
1056       return FALSE;
1057    }
1058
1059    return (rast &&
1060            (rast->fill_front != PIPE_POLYGON_MODE_FILL ||
1061             rast->fill_back != PIPE_POLYGON_MODE_FILL));
1062 }