src/gallium/auxiliary/draw/draw_context.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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 VMWARE 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 <keithw@vmware.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 "util/u_format.h"
  42 #include "draw_context.h"
  43 #include "draw_pipe.h"
  44 #include "draw_prim_assembler.h"
  45 #include "draw_vs.h"
  46 #include "draw_gs.h"
  47
  48 #if HAVE_LLVM
  49 #include "gallivm/lp_bld_init.h"
  50 #include "gallivm/lp_bld_limits.h"
  51 #include "draw_llvm.h"
  52
  53 boolean
  54 draw_get_option_use_llvm(void)
  55 {
  56    static boolean first = TRUE;
  57    static boolean value;
  58    if (first) {
  59       first = FALSE;
  60       value = debug_get_bool_option("DRAW_USE_LLVM", TRUE);
  61
  62 #ifdef PIPE_ARCH_X86
  63       util_cpu_detect();
  64       /* require SSE2 due to LLVM PR6960. XXX Might be fixed by now? */
  65       if (!util_cpu_caps.has_sse2)
  66          value = FALSE;
  67 #endif
  68    }
  69    return value;
  70 }
  71 #endif
  72
  73
  74 /**
  75  * Create new draw module context with gallivm state for LLVM JIT.
  76  */
  77 static struct draw_context *
  78 draw_create_context(struct pipe_context *pipe, boolean try_llvm)
  79 {
  80    struct draw_context *draw = CALLOC_STRUCT( draw_context );
  81    if (draw == NULL)
  82       goto err_out;
  83
  84    /* we need correct cpu caps for disabling denorms in draw_vbo() */
  85    util_cpu_detect();
  86
  87 #if HAVE_LLVM
  88    if (try_llvm && draw_get_option_use_llvm()) {
  89       draw->llvm = draw_llvm_create(draw);
  90       if (!draw->llvm)
  91          goto err_destroy;
  92    }
  93 #endif
  94
  95    draw->pipe = pipe;
  96
  97    if (!draw_init(draw))
  98       goto err_destroy;
  99
 100    draw->ia = draw_prim_assembler_create(draw);
 101    if (!draw->ia)
 102       goto err_destroy;
 103
 104    return draw;
 105
 106 err_destroy:
 107    draw_destroy( draw );
 108 err_out:
 109    return NULL;
 110 }
 111
 112
 113 /**
 114  * Create new draw module context, with LLVM JIT.
 115  */
 116 struct draw_context *
 117 draw_create(struct pipe_context *pipe)
 118 {
 119    return draw_create_context(pipe, TRUE);
 120 }
 121
 122
 123 /**
 124  * Create a new draw context, without LLVM JIT.
 125  */
 126 struct draw_context *
 127 draw_create_no_llvm(struct pipe_context *pipe)
 128 {
 129    return draw_create_context(pipe, FALSE);
 130 }
 131
 132
 133 boolean draw_init(struct draw_context *draw)
 134 {
 135    /*
 136     * Note that several functions compute the clipmask of the predefined
 137     * formats with hardcoded formulas instead of using these. So modifications
 138     * here must be reflected there too.
 139     */
 140
 141    ASSIGN_4V( draw->plane[0], -1,  0,  0, 1 );
 142    ASSIGN_4V( draw->plane[1],  1,  0,  0, 1 );
 143    ASSIGN_4V( draw->plane[2],  0, -1,  0, 1 );
 144    ASSIGN_4V( draw->plane[3],  0,  1,  0, 1 );
 145    ASSIGN_4V( draw->plane[4],  0,  0,  1, 1 ); /* yes these are correct */
 146    ASSIGN_4V( draw->plane[5],  0,  0, -1, 1 ); /* mesa's a bit wonky */
 147    draw->clip_xy = TRUE;
 148    draw->clip_z = TRUE;
 149
 150    draw->pt.user.planes = (float (*) [DRAW_TOTAL_CLIP_PLANES][4]) &(draw->plane[0]);
 151    draw->pt.user.eltMax = ~0;
 152
 153    if (!draw_pipeline_init( draw ))
 154       return FALSE;
 155
 156    if (!draw_pt_init( draw ))
 157       return FALSE;
 158
 159    if (!draw_vs_init( draw ))
 160       return FALSE;
 161
 162    if (!draw_gs_init( draw ))
 163       return FALSE;
 164
 165    draw->quads_always_flatshade_last = !draw->pipe->screen->get_param(
 166       draw->pipe->screen, PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION);
 167
 168    draw->floating_point_depth = false;
 169
 170    return TRUE;
 171 }
 172
 173 /*
 174  * Called whenever we're starting to draw a new instance.
 175  * Some internal structures don't want to have to reset internal
 176  * members on each invocation (because their state might have to persist
 177  * between multiple primitive restart rendering call) but might have to
 178  * for each new instance.
 179  * This is particularly the case for primitive id's in geometry shader.
 180  */
 181 void draw_new_instance(struct draw_context *draw)
 182 {
 183    draw_geometry_shader_new_instance(draw->gs.geometry_shader);
 184 }
 185
 186
 187 void draw_destroy( struct draw_context *draw )
 188 {
 189    struct pipe_context *pipe;
 190    unsigned i, j;
 191
 192    if (!draw)
 193       return;
 194
 195    pipe = draw->pipe;
 196
 197    /* free any rasterizer CSOs that we may have created.
 198     */
 199    for (i = 0; i < 2; i++) {
 200       for (j = 0; j < 2; j++) {
 201          if (draw->rasterizer_no_cull[i][j]) {
 202             pipe->delete_rasterizer_state(pipe, draw->rasterizer_no_cull[i][j]);
 203          }
 204       }
 205    }
 206
 207    for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 208       pipe_resource_reference(&draw->pt.vertex_buffer[i].buffer, NULL);
 209    }
 210
 211    /* Not so fast -- we're just borrowing this at the moment.
 212     *
 213    if (draw->render)
 214       draw->render->destroy( draw->render );
 215    */
 216
 217    draw_prim_assembler_destroy(draw->ia);
 218    draw_pipeline_destroy( draw );
 219    draw_pt_destroy( draw );
 220    draw_vs_destroy( draw );
 221    draw_gs_destroy( draw );
 222 #ifdef HAVE_LLVM
 223    if (draw->llvm)
 224       draw_llvm_destroy( draw->llvm );
 225 #endif
 226
 227    FREE( draw );
 228 }
 229
 230
 231
 232 void draw_flush( struct draw_context *draw )
 233 {
 234    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 235 }
 236
 237
 238 /**
 239  * Specify the depth stencil format for the draw pipeline. This function
 240  * determines the Minimum Resolvable Depth factor for polygon offset.
 241  * This factor potentially depends on the number of Z buffer bits,
 242  * the rasterization algorithm and the arithmetic performed on Z
 243  * values between vertex shading and rasterization.
 244  */
 245 void draw_set_zs_format(struct draw_context *draw, enum pipe_format format)
 246 {
 247    const struct util_format_description *desc = util_format_description(format);
 248
 249    draw->floating_point_depth =
 250       (util_get_depth_format_type(desc) == UTIL_FORMAT_TYPE_FLOAT);
 251
 252    draw->mrd = util_get_depth_format_mrd(desc);
 253 }
 254
 255
 256 static void update_clip_flags( struct draw_context *draw )
 257 {
 258    draw->clip_xy = !draw->driver.bypass_clip_xy;
 259    draw->guard_band_xy = (!draw->driver.bypass_clip_xy &&
 260                           draw->driver.guard_band_xy);
 261    draw->clip_z = (!draw->driver.bypass_clip_z &&
 262                    draw->rasterizer && draw->rasterizer->depth_clip);
 263    draw->clip_user = draw->rasterizer &&
 264                      draw->rasterizer->clip_plane_enable != 0;
 265    draw->guard_band_points_xy = draw->guard_band_xy ||
 266                                 (draw->driver.bypass_clip_points &&
 267                                 (draw->rasterizer &&
 268                                  draw->rasterizer->point_tri_clip));
 269 }
 270
 271 /**
 272  * Register new primitive rasterization/rendering state.
 273  * This causes the drawing pipeline to be rebuilt.
 274  */
 275 void draw_set_rasterizer_state( struct draw_context *draw,
 276                                 const struct pipe_rasterizer_state *raster,
 277                                 void *rast_handle )
 278 {
 279    if (!draw->suspend_flushing) {
 280       draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 281
 282       draw->rasterizer = raster;
 283       draw->rast_handle = rast_handle;
 284       update_clip_flags(draw);
 285    }
 286 }
 287
 288 /* With a little more work, llvmpipe will be able to turn this off and
 289  * do its own x/y clipping.
 290  *
 291  * Some hardware can turn off clipping altogether - in particular any
 292  * hardware with a TNL unit can do its own clipping, even if it is
 293  * relying on the draw module for some other reason.
 294  * Setting bypass_clip_points to achieve d3d-style point clipping (the driver
 295  * will need to do the "vp scissoring") _requires_ the driver to implement
 296  * wide points / point sprites itself (points will still be clipped if rasterizer
 297  * point_tri_clip isn't set). Only relevant if bypass_clip_xy isn't set.
 298  */
 299 void draw_set_driver_clipping( struct draw_context *draw,
 300                                boolean bypass_clip_xy,
 301                                boolean bypass_clip_z,
 302                                boolean guard_band_xy,
 303                                boolean bypass_clip_points)
 304 {
 305    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 306
 307    draw->driver.bypass_clip_xy = bypass_clip_xy;
 308    draw->driver.bypass_clip_z = bypass_clip_z;
 309    draw->driver.guard_band_xy = guard_band_xy;
 310    draw->driver.bypass_clip_points = bypass_clip_points;
 311    update_clip_flags(draw);
 312 }
 313
 314
 315 /**
 316  * Plug in the primitive rendering/rasterization stage (which is the last
 317  * stage in the drawing pipeline).
 318  * This is provided by the device driver.
 319  */
 320 void draw_set_rasterize_stage( struct draw_context *draw,
 321                                struct draw_stage *stage )
 322 {
 323    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 324
 325    draw->pipeline.rasterize = stage;
 326 }
 327
 328
 329 /**
 330  * Set the draw module's clipping state.
 331  */
 332 void draw_set_clip_state( struct draw_context *draw,
 333                           const struct pipe_clip_state *clip )
 334 {
 335    draw_do_flush(draw, DRAW_FLUSH_PARAMETER_CHANGE);
 336
 337    memcpy(&draw->plane[6], clip->ucp, sizeof(clip->ucp));
 338 }
 339
 340
 341 /**
 342  * Set the draw module's viewport state.
 343  */
 344 void draw_set_viewport_states( struct draw_context *draw,
 345                                unsigned start_slot,
 346                                unsigned num_viewports,
 347                                const struct pipe_viewport_state *vps )
 348 {
 349    const struct pipe_viewport_state *viewport = vps;
 350    draw_do_flush(draw, DRAW_FLUSH_PARAMETER_CHANGE);
 351
 352    debug_assert(start_slot < PIPE_MAX_VIEWPORTS);
 353    debug_assert((start_slot + num_viewports) <= PIPE_MAX_VIEWPORTS);
 354
 355    memcpy(draw->viewports + start_slot, vps,
 356           sizeof(struct pipe_viewport_state) * num_viewports);
 357
 358    draw->identity_viewport = (num_viewports == 1) &&
 359       (viewport->scale[0] == 1.0f &&
 360        viewport->scale[1] == 1.0f &&
 361        viewport->scale[2] == 1.0f &&
 362        viewport->scale[3] == 1.0f &&
 363        viewport->translate[0] == 0.0f &&
 364        viewport->translate[1] == 0.0f &&
 365        viewport->translate[2] == 0.0f &&
 366        viewport->translate[3] == 0.0f);
 367 }
 368
 369
 370
 371 void
 372 draw_set_vertex_buffers(struct draw_context *draw,
 373                         unsigned start_slot, unsigned count,
 374                         const struct pipe_vertex_buffer *buffers)
 375 {
 376    assert(start_slot + count <= PIPE_MAX_ATTRIBS);
 377
 378    util_set_vertex_buffers_count(draw->pt.vertex_buffer,
 379                                  &draw->pt.nr_vertex_buffers,
 380                                  buffers, start_slot, count);
 381 }
 382
 383
 384 void
 385 draw_set_vertex_elements(struct draw_context *draw,
 386                          unsigned count,
 387                          const struct pipe_vertex_element *elements)
 388 {
 389    assert(count <= PIPE_MAX_ATTRIBS);
 390
 391    /* We could improve this by only flushing the frontend and the fetch part
 392     * of the middle. This would avoid recalculating the emit keys.*/
 393    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 394
 395    memcpy(draw->pt.vertex_element, elements, count * sizeof(elements[0]));
 396    draw->pt.nr_vertex_elements = count;
 397 }
 398
 399
 400 /**
 401  * Tell drawing context where to find mapped vertex buffers.
 402  */
 403 void
 404 draw_set_mapped_vertex_buffer(struct draw_context *draw,
 405                               unsigned attr, const void *buffer,
 406                               size_t size)
 407 {
 408    draw->pt.user.vbuffer[attr].map  = buffer;
 409    draw->pt.user.vbuffer[attr].size = size;
 410 }
 411
 412
 413 void
 414 draw_set_mapped_constant_buffer(struct draw_context *draw,
 415                                 unsigned shader_type,
 416                                 unsigned slot,
 417                                 const void *buffer,
 418                                 unsigned size )
 419 {
 420    debug_assert(shader_type == PIPE_SHADER_VERTEX ||
 421                 shader_type == PIPE_SHADER_GEOMETRY);
 422    debug_assert(slot < PIPE_MAX_CONSTANT_BUFFERS);
 423
 424    draw_do_flush(draw, DRAW_FLUSH_PARAMETER_CHANGE);
 425
 426    switch (shader_type) {
 427    case PIPE_SHADER_VERTEX:
 428       draw->pt.user.vs_constants[slot] = buffer;
 429       draw->pt.user.vs_constants_size[slot] = size;
 430       break;
 431    case PIPE_SHADER_GEOMETRY:
 432       draw->pt.user.gs_constants[slot] = buffer;
 433       draw->pt.user.gs_constants_size[slot] = size;
 434       break;
 435    default:
 436       assert(0 && "invalid shader type in draw_set_mapped_constant_buffer");
 437    }
 438 }
 439
 440
 441 /**
 442  * Tells the draw module to draw points with triangles if their size
 443  * is greater than this threshold.
 444  */
 445 void
 446 draw_wide_point_threshold(struct draw_context *draw, float threshold)
 447 {
 448    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 449    draw->pipeline.wide_point_threshold = threshold;
 450 }
 451
 452
 453 /**
 454  * Should the draw module handle point->quad conversion for drawing sprites?
 455  */
 456 void
 457 draw_wide_point_sprites(struct draw_context *draw, boolean draw_sprite)
 458 {
 459    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 460    draw->pipeline.wide_point_sprites = draw_sprite;
 461 }
 462
 463
 464 /**
 465  * Tells the draw module to draw lines with triangles if their width
 466  * is greater than this threshold.
 467  */
 468 void
 469 draw_wide_line_threshold(struct draw_context *draw, float threshold)
 470 {
 471    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 472    draw->pipeline.wide_line_threshold = roundf(threshold);
 473 }
 474
 475
 476 /**
 477  * Tells the draw module whether or not to implement line stipple.
 478  */
 479 void
 480 draw_enable_line_stipple(struct draw_context *draw, boolean enable)
 481 {
 482    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 483    draw->pipeline.line_stipple = enable;
 484 }
 485
 486
 487 /**
 488  * Tells draw module whether to convert points to quads for sprite mode.
 489  */
 490 void
 491 draw_enable_point_sprites(struct draw_context *draw, boolean enable)
 492 {
 493    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 494    draw->pipeline.point_sprite = enable;
 495 }
 496
 497
 498 void
 499 draw_set_force_passthrough( struct draw_context *draw, boolean enable )
 500 {
 501    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 502    draw->force_passthrough = enable;
 503 }
 504
 505
 506
 507 /**
 508  * Allocate an extra vertex/geometry shader vertex attribute, if it doesn't
 509  * exist already.
 510  *
 511  * This is used by some of the optional draw module stages such
 512  * as wide_point which may need to allocate additional generic/texcoord
 513  * attributes.
 514  */
 515 int
 516 draw_alloc_extra_vertex_attrib(struct draw_context *draw,
 517                                uint semantic_name, uint semantic_index)
 518 {
 519    int slot;
 520    uint num_outputs;
 521    uint n;
 522
 523    slot = draw_find_shader_output(draw, semantic_name, semantic_index);
 524    if (slot >= 0) {
 525       return slot;
 526    }
 527
 528    num_outputs = draw_current_shader_outputs(draw);
 529    n = draw->extra_shader_outputs.num;
 530
 531    assert(n < Elements(draw->extra_shader_outputs.semantic_name));
 532
 533    draw->extra_shader_outputs.semantic_name[n] = semantic_name;
 534    draw->extra_shader_outputs.semantic_index[n] = semantic_index;
 535    draw->extra_shader_outputs.slot[n] = num_outputs + n;
 536    draw->extra_shader_outputs.num++;
 537
 538    return draw->extra_shader_outputs.slot[n];
 539 }
 540
 541
 542 /**
 543  * Remove all extra vertex attributes that were allocated with
 544  * draw_alloc_extra_vertex_attrib().
 545  */
 546 void
 547 draw_remove_extra_vertex_attribs(struct draw_context *draw)
 548 {
 549    draw->extra_shader_outputs.num = 0;
 550 }
 551
 552
 553 /**
 554  * If a geometry shader is present, return its info, else the vertex shader's
 555  * info.
 556  */
 557 struct tgsi_shader_info *
 558 draw_get_shader_info(const struct draw_context *draw)
 559 {
 560
 561    if (draw->gs.geometry_shader) {
 562       return &draw->gs.geometry_shader->info;
 563    } else {
 564       return &draw->vs.vertex_shader->info;
 565    }
 566 }
 567
 568 /**
 569  * Prepare outputs slots from the draw module
 570  *
 571  * Certain parts of the draw module can emit additional
 572  * outputs that can be quite useful to the backends, a good
 573  * example of it is the process of decomposing primitives
 574  * into wireframes (aka. lines) which normally would lose
 575  * the face-side information, but using this method we can
 576  * inject another shader output which passes the original
 577  * face side information to the backend.
 578  */
 579 void
 580 draw_prepare_shader_outputs(struct draw_context *draw)
 581 {
 582    draw_remove_extra_vertex_attribs(draw);
 583    draw_prim_assembler_prepare_outputs(draw->ia);
 584    draw_unfilled_prepare_outputs(draw, draw->pipeline.unfilled);
 585    if (draw->pipeline.aapoint)
 586       draw_aapoint_prepare_outputs(draw, draw->pipeline.aapoint);
 587    if (draw->pipeline.aaline)
 588       draw_aaline_prepare_outputs(draw, draw->pipeline.aaline);
 589 }
 590
 591 /**
 592  * Ask the draw module for the location/slot of the given vertex attribute in
 593  * a post-transformed vertex.
 594  *
 595  * With this function, drivers that use the draw module should have no reason
 596  * to track the current vertex/geometry shader.
 597  *
 598  * Note that the draw module may sometimes generate vertices with extra
 599  * attributes (such as texcoords for AA lines).  The driver can call this
 600  * function to find those attributes.
 601  *
 602  * -1 is returned if the attribute is not found since this is
 603  * an undefined situation. Note, that zero is valid and can
 604  * be used by any of the attributes, because position is not
 605  * required to be attribute 0 or even at all present.
 606  */
 607 int
 608 draw_find_shader_output(const struct draw_context *draw,
 609                         uint semantic_name, uint semantic_index)
 610 {
 611    const struct tgsi_shader_info *info = draw_get_shader_info(draw);
 612    uint i;
 613
 614    for (i = 0; i < info->num_outputs; i++) {
 615       if (info->output_semantic_name[i] == semantic_name &&
 616           info->output_semantic_index[i] == semantic_index)
 617          return i;
 618    }
 619
 620    /* Search the extra vertex attributes */
 621    for (i = 0; i < draw->extra_shader_outputs.num; i++) {
 622       if (draw->extra_shader_outputs.semantic_name[i] == semantic_name &&
 623           draw->extra_shader_outputs.semantic_index[i] == semantic_index) {
 624          return draw->extra_shader_outputs.slot[i];
 625       }
 626    }
 627
 628    return -1;
 629 }
 630
 631
 632 /**
 633  * Return total number of the shader outputs.  This function is similar to
 634  * draw_current_shader_outputs() but this function also counts any extra
 635  * vertex/geometry output attributes that may be filled in by some draw
 636  * stages (such as AA point, AA line).
 637  *
 638  * If geometry shader is present, its output will be returned,
 639  * if not vertex shader is used.
 640  */
 641 uint
 642 draw_num_shader_outputs(const struct draw_context *draw)
 643 {
 644    const struct tgsi_shader_info *info = draw_get_shader_info(draw);
 645    uint count;
 646
 647    count = info->num_outputs;
 648    count += draw->extra_shader_outputs.num;
 649
 650    return count;
 651 }
 652
 653
 654 /**
 655  * Return total number of the vertex shader outputs.  This function
 656  * also counts any extra vertex output attributes that may
 657  * be filled in by some draw stages (such as AA point, AA line,
 658  * front face).
 659  */
 660 uint
 661 draw_total_vs_outputs(const struct draw_context *draw)
 662 {
 663    const struct tgsi_shader_info *info = &draw->vs.vertex_shader->info;
 664
 665    return info->num_outputs + draw->extra_shader_outputs.num;;
 666 }
 667
 668 /**
 669  * Return total number of the geometry shader outputs. This function
 670  * also counts any extra geometry output attributes that may
 671  * be filled in by some draw stages (such as AA point, AA line, front
 672  * face).
 673  */
 674 uint
 675 draw_total_gs_outputs(const struct draw_context *draw)
 676 {
 677    const struct tgsi_shader_info *info;
 678
 679    if (!draw->gs.geometry_shader)
 680       return 0;
 681
 682    info = &draw->gs.geometry_shader->info;
 683
 684    return info->num_outputs + draw->extra_shader_outputs.num;
 685 }
 686
 687
 688 /**
 689  * Provide TGSI sampler objects for vertex/geometry shaders that use
 690  * texture fetches.  This state only needs to be set once per context.
 691  * This might only be used by software drivers for the time being.
 692  */
 693 void
 694 draw_texture_sampler(struct draw_context *draw,
 695                      uint shader,
 696                      struct tgsi_sampler *sampler)
 697 {
 698    if (shader == PIPE_SHADER_VERTEX) {
 699       draw->vs.tgsi.sampler = sampler;
 700    } else {
 701       debug_assert(shader == PIPE_SHADER_GEOMETRY);
 702       draw->gs.tgsi.sampler = sampler;
 703    }
 704 }
 705
 706
 707
 708
 709 void draw_set_render( struct draw_context *draw,
 710                       struct vbuf_render *render )
 711 {
 712    draw->render = render;
 713 }
 714
 715
 716 /**
 717  * Tell the draw module where vertex indexes/elements are located, and
 718  * their size (in bytes).
 719  *
 720  * Note: the caller must apply the pipe_index_buffer::offset value to
 721  * the address.  The draw module doesn't do that.
 722  */
 723 void
 724 draw_set_indexes(struct draw_context *draw,
 725                  const void *elements, unsigned elem_size,
 726                  unsigned elem_buffer_space)
 727 {
 728    assert(elem_size == 0 ||
 729           elem_size == 1 ||
 730           elem_size == 2 ||
 731           elem_size == 4);
 732    draw->pt.user.elts = elements;
 733    draw->pt.user.eltSizeIB = elem_size;
 734    if (elem_size)
 735       draw->pt.user.eltMax = elem_buffer_space / elem_size;
 736    else
 737       draw->pt.user.eltMax = 0;
 738 }
 739
 740
 741 /* Revamp me please:
 742  */
 743 void draw_do_flush( struct draw_context *draw, unsigned flags )
 744 {
 745    if (!draw->suspend_flushing)
 746    {
 747       assert(!draw->flushing); /* catch inadvertant recursion */
 748
 749       draw->flushing = TRUE;
 750
 751       draw_pipeline_flush( draw, flags );
 752
 753       draw_pt_flush( draw, flags );
 754
 755       draw->flushing = FALSE;
 756    }
 757 }
 758
 759
 760 /**
 761  * Return the number of output attributes produced by the geometry
 762  * shader, if present.  If no geometry shader, return the number of
 763  * outputs from the vertex shader.
 764  * \sa draw_num_shader_outputs
 765  */
 766 uint
 767 draw_current_shader_outputs(const struct draw_context *draw)
 768 {
 769    if (draw->gs.geometry_shader)
 770       return draw->gs.num_gs_outputs;
 771    return draw->vs.num_vs_outputs;
 772 }
 773
 774
 775 /**
 776  * Return the index of the shader output which will contain the
 777  * vertex position.
 778  */
 779 uint
 780 draw_current_shader_position_output(const struct draw_context *draw)
 781 {
 782    if (draw->gs.geometry_shader)
 783       return draw->gs.position_output;
 784    return draw->vs.position_output;
 785 }
 786
 787
 788 /**
 789  * Return the index of the shader output which will contain the
 790  * viewport index.
 791  */
 792 uint
 793 draw_current_shader_viewport_index_output(const struct draw_context *draw)
 794 {
 795    if (draw->gs.geometry_shader)
 796       return draw->gs.geometry_shader->viewport_index_output;
 797    return 0;
 798 }
 799
 800 /**
 801  * Returns true if there's a geometry shader bound and the geometry
 802  * shader writes out a viewport index.
 803  */
 804 boolean
 805 draw_current_shader_uses_viewport_index(const struct draw_context *draw)
 806 {
 807    if (draw->gs.geometry_shader)
 808       return draw->gs.geometry_shader->info.writes_viewport_index;
 809    return FALSE;
 810 }
 811
 812
 813 /**
 814  * Return the index of the shader output which will contain the
 815  * vertex position.
 816  */
 817 uint
 818 draw_current_shader_clipvertex_output(const struct draw_context *draw)
 819 {
 820    return draw->vs.clipvertex_output;
 821 }
 822
 823 uint
 824 draw_current_shader_clipdistance_output(const struct draw_context *draw, int index)
 825 {
 826    debug_assert(index < PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT);
 827    if (draw->gs.geometry_shader)
 828       return draw->gs.geometry_shader->clipdistance_output[index];
 829    return draw->vs.clipdistance_output[index];
 830 }
 831
 832
 833 uint
 834 draw_current_shader_num_written_clipdistances(const struct draw_context *draw)
 835 {
 836    if (draw->gs.geometry_shader)
 837       return draw->gs.geometry_shader->info.num_written_clipdistance;
 838    return draw->vs.vertex_shader->info.num_written_clipdistance;
 839 }
 840
 841
 842 uint
 843 draw_current_shader_culldistance_output(const struct draw_context *draw, int index)
 844 {
 845    debug_assert(index < PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT);
 846    if (draw->gs.geometry_shader)
 847       return draw->gs.geometry_shader->culldistance_output[index];
 848    return draw->vs.vertex_shader->culldistance_output[index];
 849 }
 850
 851 uint
 852 draw_current_shader_num_written_culldistances(const struct draw_context *draw)
 853 {
 854    if (draw->gs.geometry_shader)
 855       return draw->gs.geometry_shader->info.num_written_culldistance;
 856    return draw->vs.vertex_shader->info.num_written_culldistance;
 857 }
 858
 859 /**
 860  * Return a pointer/handle for a driver/CSO rasterizer object which
 861  * disabled culling, stippling, unfilled tris, etc.
 862  * This is used by some pipeline stages (such as wide_point, aa_line
 863  * and aa_point) which convert points/lines into triangles.  In those
 864  * cases we don't want to accidentally cull the triangles.
 865  *
 866  * \param scissor  should the rasterizer state enable scissoring?
 867  * \param flatshade  should the rasterizer state use flat shading?
 868  * \return  rasterizer CSO handle
 869  */
 870 void *
 871 draw_get_rasterizer_no_cull( struct draw_context *draw,
 872                              boolean scissor,
 873                              boolean flatshade )
 874 {
 875    if (!draw->rasterizer_no_cull[scissor][flatshade]) {
 876       /* create now */
 877       struct pipe_context *pipe = draw->pipe;
 878       struct pipe_rasterizer_state rast;
 879
 880       memset(&rast, 0, sizeof(rast));
 881       rast.scissor = scissor;
 882       rast.flatshade = flatshade;
 883       rast.front_ccw = 1;
 884       rast.half_pixel_center = draw->rasterizer->half_pixel_center;
 885       rast.bottom_edge_rule = draw->rasterizer->bottom_edge_rule;
 886       rast.clip_halfz = draw->rasterizer->clip_halfz;
 887
 888       draw->rasterizer_no_cull[scissor][flatshade] =
 889          pipe->create_rasterizer_state(pipe, &rast);
 890    }
 891    return draw->rasterizer_no_cull[scissor][flatshade];
 892 }
 893
 894 void
 895 draw_set_mapped_so_targets(struct draw_context *draw,
 896                            int num_targets,
 897                            struct draw_so_target *targets[PIPE_MAX_SO_BUFFERS])
 898 {
 899    int i;
 900
 901    for (i = 0; i < num_targets; i++)
 902       draw->so.targets[i] = targets[i];
 903    for (i = num_targets; i < PIPE_MAX_SO_BUFFERS; i++)
 904       draw->so.targets[i] = NULL;
 905
 906    draw->so.num_targets = num_targets;
 907 }
 908
 909 void
 910 draw_set_sampler_views(struct draw_context *draw,
 911                        unsigned shader_stage,
 912                        struct pipe_sampler_view **views,
 913                        unsigned num)
 914 {
 915    unsigned i;
 916
 917    debug_assert(shader_stage < PIPE_SHADER_TYPES);
 918    debug_assert(num <= PIPE_MAX_SHADER_SAMPLER_VIEWS);
 919
 920    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 921
 922    for (i = 0; i < num; ++i)
 923       draw->sampler_views[shader_stage][i] = views[i];
 924    for (i = num; i < PIPE_MAX_SHADER_SAMPLER_VIEWS; ++i)
 925       draw->sampler_views[shader_stage][i] = NULL;
 926
 927    draw->num_sampler_views[shader_stage] = num;
 928 }
 929
 930 void
 931 draw_set_samplers(struct draw_context *draw,
 932                   unsigned shader_stage,
 933                   struct pipe_sampler_state **samplers,
 934                   unsigned num)
 935 {
 936    unsigned i;
 937
 938    debug_assert(shader_stage < PIPE_SHADER_TYPES);
 939    debug_assert(num <= PIPE_MAX_SAMPLERS);
 940
 941    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 942
 943    for (i = 0; i < num; ++i)
 944       draw->samplers[shader_stage][i] = samplers[i];
 945    for (i = num; i < PIPE_MAX_SAMPLERS; ++i)
 946       draw->samplers[shader_stage][i] = NULL;
 947
 948    draw->num_samplers[shader_stage] = num;
 949
 950 #ifdef HAVE_LLVM
 951    if (draw->llvm)
 952       draw_llvm_set_sampler_state(draw, shader_stage);
 953 #endif
 954 }
 955
 956 void
 957 draw_set_mapped_texture(struct draw_context *draw,
 958                         unsigned shader_stage,
 959                         unsigned sview_idx,
 960                         uint32_t width, uint32_t height, uint32_t depth,
 961                         uint32_t first_level, uint32_t last_level,
 962                         const void *base_ptr,
 963                         uint32_t row_stride[PIPE_MAX_TEXTURE_LEVELS],
 964                         uint32_t img_stride[PIPE_MAX_TEXTURE_LEVELS],
 965                         uint32_t mip_offsets[PIPE_MAX_TEXTURE_LEVELS])
 966 {
 967 #ifdef HAVE_LLVM
 968    if (draw->llvm)
 969       draw_llvm_set_mapped_texture(draw,
 970                                    shader_stage,
 971                                    sview_idx,
 972                                    width, height, depth, first_level,
 973                                    last_level, base_ptr,
 974                                    row_stride, img_stride, mip_offsets);
 975 #endif
 976 }
 977
 978 /**
 979  * XXX: Results for PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS because there are two
 980  * different ways of setting textures, and drivers typically only support one.
 981  */
 982 int
 983 draw_get_shader_param_no_llvm(unsigned shader, enum pipe_shader_cap param)
 984 {
 985    switch(shader) {
 986    case PIPE_SHADER_VERTEX:
 987    case PIPE_SHADER_GEOMETRY:
 988       return tgsi_exec_get_shader_param(param);
 989    default:
 990       return 0;
 991    }
 992 }
 993
 994 /**
 995  * XXX: Results for PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS because there are two
 996  * different ways of setting textures, and drivers typically only support one.
 997  */
 998 int
 999 draw_get_shader_param(unsigned shader, enum pipe_shader_cap param)
1000 {
1001
1002 #ifdef HAVE_LLVM
1003    if (draw_get_option_use_llvm()) {
1004       switch(shader) {
1005       case PIPE_SHADER_VERTEX:
1006       case PIPE_SHADER_GEOMETRY:
1007          return gallivm_get_shader_param(param);
1008       default:
1009          return 0;
1010       }
1011    }
1012 #endif
1013
1014    return draw_get_shader_param_no_llvm(shader, param);
1015 }
1016
1017 /**
1018  * Enables or disables collection of statistics.
1019  *
1020  * Draw module is capable of generating statistics for the vertex
1021  * processing pipeline. Collection of that data isn't free and so
1022  * it's disabled by default. The users of the module can enable
1023  * (or disable) this functionality through this function.
1024  * The actual data will be emitted through the VBUF interface,
1025  * the 'pipeline_statistics' callback to be exact.
1026  */
1027 void
1028 draw_collect_pipeline_statistics(struct draw_context *draw,
1029                                  boolean enable)
1030 {
1031    draw->collect_statistics = enable;
1032 }
1033
1034 /**
1035  * Computes clipper invocation statistics.
1036  *
1037  * Figures out how many primitives would have been
1038  * sent to the clipper given the specified
1039  * prim info data.
1040  */
1041 void
1042 draw_stats_clipper_primitives(struct draw_context *draw,
1043                               const struct draw_prim_info *prim_info)
1044 {
1045    if (draw->collect_statistics) {
1046       unsigned i;
1047       for (i = 0; i < prim_info->primitive_count; i++) {
1048          draw->statistics.c_invocations +=
1049             u_decomposed_prims_for_vertices(prim_info->prim,
1050                                             prim_info->primitive_lengths[i]);
1051       }
1052    }
1053 }
1054
1055
1056 /**
1057  * Returns true if the draw module will inject the frontface
1058  * info into the outputs.
1059  *
1060  * Given the specified primitive and rasterizer state
1061  * the function will figure out if the draw module
1062  * will inject the front-face information into shader
1063  * outputs. This is done to preserve the front-facing
1064  * info when decomposing primitives into wireframes.
1065  */
1066 boolean
1067 draw_will_inject_frontface(const struct draw_context *draw)
1068 {
1069    unsigned reduced_prim = u_reduced_prim(draw->pt.prim);
1070    const struct pipe_rasterizer_state *rast = draw->rasterizer;
1071
1072    if (reduced_prim != PIPE_PRIM_TRIANGLES) {
1073       return FALSE;
1074    }
1075
1076    return (rast &&
1077            (rast->fill_front != PIPE_POLYGON_MODE_FILL ||
1078             rast->fill_back != PIPE_POLYGON_MODE_FILL));
1079 }