src/gallium/drivers/llvmpipe/lp_state_fs.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29 /**
  30  * @file
  31  * Code generate the whole fragment pipeline.
  32  *
  33  * The fragment pipeline consists of the following stages:
  34  * - triangle edge in/out testing
  35  * - scissor test
  36  * - stipple (TBI)
  37  * - early depth test
  38  * - fragment shader
  39  * - alpha test
  40  * - depth/stencil test (stencil TBI)
  41  * - blending
  42  *
  43  * This file has only the glue to assemble the fragment pipeline.  The actual
  44  * plumbing of converting Gallium state into LLVM IR is done elsewhere, in the
  45  * lp_bld_*.[ch] files, and in a complete generic and reusable way. Here we
  46  * muster the LLVM JIT execution engine to create a function that follows an
  47  * established binary interface and that can be called from C directly.
  48  *
  49  * A big source of complexity here is that we often want to run different
  50  * stages with different precisions and data types and precisions. For example,
  51  * the fragment shader needs typically to be done in floats, but the
  52  * depth/stencil test and blending is better done in the type that most closely
  53  * matches the depth/stencil and color buffer respectively.
  54  *
  55  * Since the width of a SIMD vector register stays the same regardless of the
  56  * element type, different types imply different number of elements, so we must
  57  * code generate more instances of the stages with larger types to be able to
  58  * feed/consume the stages with smaller types.
  59  *
  60  * @author Jose Fonseca <jfonseca@vmware.com>
  61  */
  62
  63 #include <limits.h>
  64 #include "pipe/p_defines.h"
  65 #include "util/u_inlines.h"
  66 #include "util/u_memory.h"
  67 #include "util/u_format.h"
  68 #include "util/u_dump.h"
  69 #include "os/os_time.h"
  70 #include "pipe/p_shader_tokens.h"
  71 #include "draw/draw_context.h"
  72 #include "tgsi/tgsi_dump.h"
  73 #include "tgsi/tgsi_scan.h"
  74 #include "tgsi/tgsi_parse.h"
  75 #include "gallivm/lp_bld_type.h"
  76 #include "gallivm/lp_bld_const.h"
  77 #include "gallivm/lp_bld_conv.h"
  78 #include "gallivm/lp_bld_intr.h"
  79 #include "gallivm/lp_bld_logic.h"
  80 #include "gallivm/lp_bld_depth.h"
  81 #include "gallivm/lp_bld_interp.h"
  82 #include "gallivm/lp_bld_tgsi.h"
  83 #include "gallivm/lp_bld_alpha.h"
  84 #include "gallivm/lp_bld_blend.h"
  85 #include "gallivm/lp_bld_swizzle.h"
  86 #include "gallivm/lp_bld_flow.h"
  87 #include "gallivm/lp_bld_debug.h"
  88 #include "lp_context.h"
  89 #include "lp_debug.h"
  90 #include "lp_perf.h"
  91 #include "lp_screen.h"
  92 #include "lp_setup.h"
  93 #include "lp_state.h"
  94 #include "lp_tex_sample.h"
  95
  96
  97 #include <llvm-c/Analysis.h>
  98
  99
 100 static const unsigned char quad_offset_x[4] = {0, 1, 0, 1};
 101 static const unsigned char quad_offset_y[4] = {0, 0, 1, 1};
 102
 103
 104 /*
 105  * Derive from the quad's upper left scalar coordinates the coordinates for
 106  * all other quad pixels
 107  */
 108 static void
 109 generate_pos0(LLVMBuilderRef builder,
 110               LLVMValueRef x,
 111               LLVMValueRef y,
 112               LLVMValueRef *x0,
 113               LLVMValueRef *y0)
 114 {
 115    LLVMTypeRef int_elem_type = LLVMInt32Type();
 116    LLVMTypeRef int_vec_type = LLVMVectorType(int_elem_type, QUAD_SIZE);
 117    LLVMTypeRef elem_type = LLVMFloatType();
 118    LLVMTypeRef vec_type = LLVMVectorType(elem_type, QUAD_SIZE);
 119    LLVMValueRef x_offsets[QUAD_SIZE];
 120    LLVMValueRef y_offsets[QUAD_SIZE];
 121    unsigned i;
 122
 123    x = lp_build_broadcast(builder, int_vec_type, x);
 124    y = lp_build_broadcast(builder, int_vec_type, y);
 125
 126    for(i = 0; i < QUAD_SIZE; ++i) {
 127       x_offsets[i] = LLVMConstInt(int_elem_type, quad_offset_x[i], 0);
 128       y_offsets[i] = LLVMConstInt(int_elem_type, quad_offset_y[i], 0);
 129    }
 130
 131    x = LLVMBuildAdd(builder, x, LLVMConstVector(x_offsets, QUAD_SIZE), "");
 132    y = LLVMBuildAdd(builder, y, LLVMConstVector(y_offsets, QUAD_SIZE), "");
 133
 134    *x0 = LLVMBuildSIToFP(builder, x, vec_type, "");
 135    *y0 = LLVMBuildSIToFP(builder, y, vec_type, "");
 136 }
 137
 138
 139 /**
 140  * Generate the depth /stencil test code.
 141  */
 142 static void
 143 generate_depth_stencil(LLVMBuilderRef builder,
 144                        const struct lp_fragment_shader_variant_key *key,
 145                        struct lp_type src_type,
 146                        struct lp_build_mask_context *mask,
 147                        LLVMValueRef stencil_refs[2],
 148                        LLVMValueRef src,
 149                        LLVMValueRef dst_ptr,
 150                        LLVMValueRef facing)
 151 {
 152    const struct util_format_description *format_desc;
 153    struct lp_type dst_type;
 154
 155    if (!key->depth.enabled && !key->stencil[0].enabled && !key->stencil[1].enabled)
 156       return;
 157
 158    format_desc = util_format_description(key->zsbuf_format);
 159    assert(format_desc);
 160
 161    /*
 162     * Depths are expected to be between 0 and 1, even if they are stored in
 163     * floats. Setting these bits here will ensure that the lp_build_conv() call
 164     * below won't try to unnecessarily clamp the incoming values.
 165     */
 166    if(src_type.floating) {
 167       src_type.sign = FALSE;
 168       src_type.norm = TRUE;
 169    }
 170    else {
 171       assert(!src_type.sign);
 172       assert(src_type.norm);
 173    }
 174
 175    /* Pick the depth type. */
 176    dst_type = lp_depth_type(format_desc, src_type.width*src_type.length);
 177
 178    /* FIXME: Cope with a depth test type with a different bit width. */
 179    assert(dst_type.width == src_type.width);
 180    assert(dst_type.length == src_type.length);
 181
 182    /* Convert fragment Z from float to integer */
 183    lp_build_conv(builder, src_type, dst_type, &src, 1, &src, 1);
 184
 185    dst_ptr = LLVMBuildBitCast(builder,
 186                               dst_ptr,
 187                               LLVMPointerType(lp_build_vec_type(dst_type), 0), "");
 188    lp_build_depth_stencil_test(builder,
 189                                &key->depth,
 190                                key->stencil,
 191                                dst_type,
 192                                format_desc,
 193                                mask,
 194                                stencil_refs,
 195                                src,
 196                                dst_ptr,
 197                                facing);
 198 }
 199
 200
 201 /**
 202  * Generate the code to do inside/outside triangle testing for the
 203  * four pixels in a 2x2 quad.  This will set the four elements of the
 204  * quad mask vector to 0 or ~0.
 205  * \param i  which quad of the quad group to test, in [0,3]
 206  */
 207 static void
 208 generate_tri_edge_mask(LLVMBuilderRef builder,
 209                        unsigned i,
 210                        LLVMValueRef *mask,      /* ivec4, out */
 211                        LLVMValueRef c0,         /* int32 */
 212                        LLVMValueRef c1,         /* int32 */
 213                        LLVMValueRef c2,         /* int32 */
 214                        LLVMValueRef step0_ptr,  /* ivec4 */
 215                        LLVMValueRef step1_ptr,  /* ivec4 */
 216                        LLVMValueRef step2_ptr)  /* ivec4 */
 217 {
 218 #define OPTIMIZE_IN_OUT_TEST 0
 219 #if OPTIMIZE_IN_OUT_TEST
 220    struct lp_build_if_state ifctx;
 221    LLVMValueRef not_draw_all;
 222 #endif
 223    struct lp_build_flow_context *flow;
 224    struct lp_type i32_type;
 225    LLVMTypeRef i32vec4_type, mask_type;
 226    LLVMValueRef c0_vec, c1_vec, c2_vec;
 227    LLVMValueRef in_out_mask;
 228
 229    assert(i < 4);
 230
 231    /* int32 vector type */
 232    memset(&i32_type, 0, sizeof i32_type);
 233    i32_type.floating = FALSE; /* values are integers */
 234    i32_type.sign = TRUE;      /* values are signed */
 235    i32_type.norm = FALSE;     /* values are not normalized */
 236    i32_type.width = 32;       /* 32-bit int values */
 237    i32_type.length = 4;       /* 4 elements per vector */
 238
 239    i32vec4_type = lp_build_int32_vec4_type();
 240
 241    mask_type = LLVMIntType(32 * 4);
 242
 243    /*
 244     * Use a conditional here to do detailed pixel in/out testing.
 245     * We only have to do this if c0 != INT_MIN.
 246     */
 247    flow = lp_build_flow_create(builder);
 248    lp_build_flow_scope_begin(flow);
 249
 250    {
 251 #if OPTIMIZE_IN_OUT_TEST
 252       /* not_draw_all = (c0 != INT_MIN) */
 253       not_draw_all = LLVMBuildICmp(builder,
 254                                    LLVMIntNE,
 255                                    c0,
 256                                    LLVMConstInt(LLVMInt32Type(), INT_MIN, 0),
 257                                    "");
 258
 259       in_out_mask = lp_build_const_int_vec(i32_type, ~0);
 260
 261
 262       lp_build_flow_scope_declare(flow, &in_out_mask);
 263
 264       /* if (not_draw_all) {... */
 265       lp_build_if(&ifctx, flow, builder, not_draw_all);
 266 #endif
 267       {
 268          LLVMValueRef step0_vec, step1_vec, step2_vec;
 269          LLVMValueRef m0_vec, m1_vec, m2_vec;
 270          LLVMValueRef index, m;
 271
 272          /* c0_vec = {c0, c0, c0, c0}
 273           * Note that we emit this code four times but LLVM optimizes away
 274           * three instances of it.
 275           */
 276          c0_vec = lp_build_broadcast(builder, i32vec4_type, c0);
 277          c1_vec = lp_build_broadcast(builder, i32vec4_type, c1);
 278          c2_vec = lp_build_broadcast(builder, i32vec4_type, c2);
 279          lp_build_name(c0_vec, "edgeconst0vec");
 280          lp_build_name(c1_vec, "edgeconst1vec");
 281          lp_build_name(c2_vec, "edgeconst2vec");
 282
 283          /* load step0vec, step1, step2 vec from memory */
 284          index = LLVMConstInt(LLVMInt32Type(), i, 0);
 285          step0_vec = LLVMBuildLoad(builder, LLVMBuildGEP(builder, step0_ptr, &index, 1, ""), "");
 286          step1_vec = LLVMBuildLoad(builder, LLVMBuildGEP(builder, step1_ptr, &index, 1, ""), "");
 287          step2_vec = LLVMBuildLoad(builder, LLVMBuildGEP(builder, step2_ptr, &index, 1, ""), "");
 288          lp_build_name(step0_vec, "step0vec");
 289          lp_build_name(step1_vec, "step1vec");
 290          lp_build_name(step2_vec, "step2vec");
 291
 292          /* m0_vec = step0_ptr[i] > c0_vec */
 293          m0_vec = lp_build_compare(builder, i32_type, PIPE_FUNC_GREATER, step0_vec, c0_vec);
 294          m1_vec = lp_build_compare(builder, i32_type, PIPE_FUNC_GREATER, step1_vec, c1_vec);
 295          m2_vec = lp_build_compare(builder, i32_type, PIPE_FUNC_GREATER, step2_vec, c2_vec);
 296
 297          /* in_out_mask = m0_vec & m1_vec & m2_vec */
 298          m = LLVMBuildAnd(builder, m0_vec, m1_vec, "");
 299          in_out_mask = LLVMBuildAnd(builder, m, m2_vec, "");
 300          lp_build_name(in_out_mask, "inoutmaskvec");
 301       }
 302 #if OPTIMIZE_IN_OUT_TEST
 303       lp_build_endif(&ifctx);
 304 #endif
 305
 306    }
 307    lp_build_flow_scope_end(flow);
 308    lp_build_flow_destroy(flow);
 309
 310    /* This is the initial alive/dead pixel mask for a quad of four pixels.
 311     * It's an int[4] vector with each word set to 0 or ~0.
 312     * Words will get cleared when pixels faile the Z test, etc.
 313     */
 314    *mask = in_out_mask;
 315 }
 316
 317
 318 static LLVMValueRef
 319 generate_scissor_test(LLVMBuilderRef builder,
 320                       LLVMValueRef context_ptr,
 321                       const struct lp_build_interp_soa_context *interp,
 322                       struct lp_type type)
 323 {
 324    LLVMTypeRef vec_type = lp_build_vec_type(type);
 325    LLVMValueRef xpos = interp->pos[0], ypos = interp->pos[1];
 326    LLVMValueRef xmin, ymin, xmax, ymax;
 327    LLVMValueRef m0, m1, m2, m3, m;
 328
 329    /* xpos, ypos contain the window coords for the four pixels in the quad */
 330    assert(xpos);
 331    assert(ypos);
 332
 333    /* get the current scissor bounds, convert to vectors */
 334    xmin = lp_jit_context_scissor_xmin_value(builder, context_ptr);
 335    xmin = lp_build_broadcast(builder, vec_type, xmin);
 336
 337    ymin = lp_jit_context_scissor_ymin_value(builder, context_ptr);
 338    ymin = lp_build_broadcast(builder, vec_type, ymin);
 339
 340    xmax = lp_jit_context_scissor_xmax_value(builder, context_ptr);
 341    xmax = lp_build_broadcast(builder, vec_type, xmax);
 342
 343    ymax = lp_jit_context_scissor_ymax_value(builder, context_ptr);
 344    ymax = lp_build_broadcast(builder, vec_type, ymax);
 345
 346    /* compare the fragment's position coordinates against the scissor bounds */
 347    m0 = lp_build_compare(builder, type, PIPE_FUNC_GEQUAL, xpos, xmin);
 348    m1 = lp_build_compare(builder, type, PIPE_FUNC_GEQUAL, ypos, ymin);
 349    m2 = lp_build_compare(builder, type, PIPE_FUNC_LESS, xpos, xmax);
 350    m3 = lp_build_compare(builder, type, PIPE_FUNC_LESS, ypos, ymax);
 351
 352    /* AND all the masks together */
 353    m = LLVMBuildAnd(builder, m0, m1, "");
 354    m = LLVMBuildAnd(builder, m, m2, "");
 355    m = LLVMBuildAnd(builder, m, m3, "");
 356
 357    lp_build_name(m, "scissormask");
 358
 359    return m;
 360 }
 361
 362
 363 static LLVMValueRef
 364 build_int32_vec_const(int value)
 365 {
 366    struct lp_type i32_type;
 367
 368    memset(&i32_type, 0, sizeof i32_type);
 369    i32_type.floating = FALSE; /* values are integers */
 370    i32_type.sign = TRUE;      /* values are signed */
 371    i32_type.norm = FALSE;     /* values are not normalized */
 372    i32_type.width = 32;       /* 32-bit int values */
 373    i32_type.length = 4;       /* 4 elements per vector */
 374    return lp_build_const_int_vec(i32_type, value);
 375 }
 376
 377
 378
 379 /**
 380  * Generate the fragment shader, depth/stencil test, and alpha tests.
 381  * \param i  which quad in the tile, in range [0,3]
 382  * \param do_tri_test  if 1, do triangle edge in/out testing
 383  */
 384 static void
 385 generate_fs(struct llvmpipe_context *lp,
 386             struct lp_fragment_shader *shader,
 387             const struct lp_fragment_shader_variant_key *key,
 388             LLVMBuilderRef builder,
 389             struct lp_type type,
 390             LLVMValueRef context_ptr,
 391             unsigned i,
 392             const struct lp_build_interp_soa_context *interp,
 393             struct lp_build_sampler_soa *sampler,
 394             LLVMValueRef *pmask,
 395             LLVMValueRef (*color)[4],
 396             LLVMValueRef depth_ptr,
 397             LLVMValueRef facing,
 398             unsigned do_tri_test,
 399             LLVMValueRef c0,
 400             LLVMValueRef c1,
 401             LLVMValueRef c2,
 402             LLVMValueRef step0_ptr,
 403             LLVMValueRef step1_ptr,
 404             LLVMValueRef step2_ptr)
 405 {
 406    const struct tgsi_token *tokens = shader->base.tokens;
 407    LLVMTypeRef elem_type;
 408    LLVMTypeRef vec_type;
 409    LLVMTypeRef int_vec_type;
 410    LLVMValueRef consts_ptr;
 411    LLVMValueRef outputs[PIPE_MAX_SHADER_OUTPUTS][NUM_CHANNELS];
 412    LLVMValueRef z = interp->pos[2];
 413    LLVMValueRef stencil_refs[2];
 414    struct lp_build_flow_context *flow;
 415    struct lp_build_mask_context mask;
 416    boolean early_depth_stencil_test;
 417    unsigned attrib;
 418    unsigned chan;
 419    unsigned cbuf;
 420
 421    assert(i < 4);
 422
 423    stencil_refs[0] = lp_jit_context_stencil_ref_front_value(builder, context_ptr);
 424    stencil_refs[1] = lp_jit_context_stencil_ref_back_value(builder, context_ptr);
 425
 426    elem_type = lp_build_elem_type(type);
 427    vec_type = lp_build_vec_type(type);
 428    int_vec_type = lp_build_int_vec_type(type);
 429
 430    consts_ptr = lp_jit_context_constants(builder, context_ptr);
 431
 432    flow = lp_build_flow_create(builder);
 433
 434    memset(outputs, 0, sizeof outputs);
 435
 436    lp_build_flow_scope_begin(flow);
 437
 438    /* Declare the color and z variables */
 439    for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++) {
 440       for(chan = 0; chan < NUM_CHANNELS; ++chan) {
 441          color[cbuf][chan] = LLVMGetUndef(vec_type);
 442          lp_build_flow_scope_declare(flow, &color[cbuf][chan]);
 443       }
 444    }
 445    lp_build_flow_scope_declare(flow, &z);
 446
 447    /* do triangle edge testing */
 448    if (do_tri_test) {
 449       generate_tri_edge_mask(builder, i, pmask,
 450                              c0, c1, c2, step0_ptr, step1_ptr, step2_ptr);
 451    }
 452    else {
 453       *pmask = build_int32_vec_const(~0);
 454    }
 455
 456    /* 'mask' will control execution based on quad's pixel alive/killed state */
 457    lp_build_mask_begin(&mask, flow, type, *pmask);
 458
 459    if (key->scissor) {
 460       LLVMValueRef smask =
 461          generate_scissor_test(builder, context_ptr, interp, type);
 462       lp_build_mask_update(&mask, smask);
 463    }
 464
 465    early_depth_stencil_test =
 466       (key->depth.enabled || key->stencil[0].enabled) &&
 467       !key->alpha.enabled &&
 468       !shader->info.uses_kill &&
 469       !shader->info.writes_z;
 470
 471    if (early_depth_stencil_test)
 472       generate_depth_stencil(builder, key,
 473                              type, &mask,
 474                              stencil_refs, z, depth_ptr, facing);
 475
 476    lp_build_tgsi_soa(builder, tokens, type, &mask,
 477                      consts_ptr, interp->pos, interp->inputs,
 478                      outputs, sampler);
 479
 480    for (attrib = 0; attrib < shader->info.num_outputs; ++attrib) {
 481       for(chan = 0; chan < NUM_CHANNELS; ++chan) {
 482          if(outputs[attrib][chan]) {
 483             LLVMValueRef out = LLVMBuildLoad(builder, outputs[attrib][chan], "");
 484             lp_build_name(out, "output%u.%u.%c", i, attrib, "xyzw"[chan]);
 485
 486             switch (shader->info.output_semantic_name[attrib]) {
 487             case TGSI_SEMANTIC_COLOR:
 488                {
 489                   unsigned cbuf = shader->info.output_semantic_index[attrib];
 490
 491                   lp_build_name(out, "color%u.%u.%c", i, attrib, "rgba"[chan]);
 492
 493                   /* Alpha test */
 494                   /* XXX: should the alpha reference value be passed separately? */
 495                   /* XXX: should only test the final assignment to alpha */
 496                   if(cbuf == 0 && chan == 3) {
 497                      LLVMValueRef alpha = out;
 498                      LLVMValueRef alpha_ref_value;
 499                      alpha_ref_value = lp_jit_context_alpha_ref_value(builder, context_ptr);
 500                      alpha_ref_value = lp_build_broadcast(builder, vec_type, alpha_ref_value);
 501                      lp_build_alpha_test(builder, &key->alpha, type,
 502                                          &mask, alpha, alpha_ref_value);
 503                   }
 504
 505                   color[cbuf][chan] = out;
 506                   break;
 507                }
 508
 509             case TGSI_SEMANTIC_POSITION:
 510                if(chan == 2)
 511                   z = out;
 512                break;
 513             }
 514          }
 515       }
 516    }
 517
 518    if (!early_depth_stencil_test)
 519       generate_depth_stencil(builder, key,
 520                              type, &mask,
 521                              stencil_refs, z, depth_ptr, facing);
 522
 523    lp_build_mask_end(&mask);
 524
 525    lp_build_flow_scope_end(flow);
 526
 527    lp_build_flow_destroy(flow);
 528
 529    *pmask = mask.value;
 530
 531 }
 532
 533
 534 /**
 535  * Generate color blending and color output.
 536  */
 537 static void
 538 generate_blend(const struct pipe_blend_state *blend,
 539                LLVMBuilderRef builder,
 540                struct lp_type type,
 541                LLVMValueRef context_ptr,
 542                LLVMValueRef mask,
 543                LLVMValueRef *src,
 544                LLVMValueRef dst_ptr)
 545 {
 546    struct lp_build_context bld;
 547    struct lp_build_flow_context *flow;
 548    struct lp_build_mask_context mask_ctx;
 549    LLVMTypeRef vec_type;
 550    LLVMTypeRef int_vec_type;
 551    LLVMValueRef const_ptr;
 552    LLVMValueRef con[4];
 553    LLVMValueRef dst[4];
 554    LLVMValueRef res[4];
 555    unsigned chan;
 556
 557    lp_build_context_init(&bld, builder, type);
 558
 559    flow = lp_build_flow_create(builder);
 560
 561    /* we'll use this mask context to skip blending if all pixels are dead */
 562    lp_build_mask_begin(&mask_ctx, flow, type, mask);
 563
 564    vec_type = lp_build_vec_type(type);
 565    int_vec_type = lp_build_int_vec_type(type);
 566
 567    const_ptr = lp_jit_context_blend_color(builder, context_ptr);
 568    const_ptr = LLVMBuildBitCast(builder, const_ptr,
 569                                 LLVMPointerType(vec_type, 0), "");
 570
 571    for(chan = 0; chan < 4; ++chan) {
 572       LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), chan, 0);
 573       con[chan] = LLVMBuildLoad(builder, LLVMBuildGEP(builder, const_ptr, &index, 1, ""), "");
 574
 575       dst[chan] = LLVMBuildLoad(builder, LLVMBuildGEP(builder, dst_ptr, &index, 1, ""), "");
 576
 577       lp_build_name(con[chan], "con.%c", "rgba"[chan]);
 578       lp_build_name(dst[chan], "dst.%c", "rgba"[chan]);
 579    }
 580
 581    lp_build_blend_soa(builder, blend, type, src, dst, con, res);
 582
 583    for(chan = 0; chan < 4; ++chan) {
 584       if(blend->rt[0].colormask & (1 << chan)) {
 585          LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), chan, 0);
 586          lp_build_name(res[chan], "res.%c", "rgba"[chan]);
 587          res[chan] = lp_build_select(&bld, mask, res[chan], dst[chan]);
 588          LLVMBuildStore(builder, res[chan], LLVMBuildGEP(builder, dst_ptr, &index, 1, ""));
 589       }
 590    }
 591
 592    lp_build_mask_end(&mask_ctx);
 593    lp_build_flow_destroy(flow);
 594 }
 595
 596
 597 /** casting function to avoid compiler warnings */
 598 static lp_jit_frag_func
 599 cast_voidptr_to_lp_jit_frag_func(void *p)
 600 {
 601    union {
 602       void *v;
 603       lp_jit_frag_func f;
 604    } tmp;
 605    assert(sizeof(tmp.v) == sizeof(tmp.f));
 606    tmp.v = p;
 607    return tmp.f;
 608 }
 609
 610
 611 /**
 612  * Generate the runtime callable function for the whole fragment pipeline.
 613  * Note that the function which we generate operates on a block of 16
 614  * pixels at at time.  The block contains 2x2 quads.  Each quad contains
 615  * 2x2 pixels.
 616  */
 617 static void
 618 generate_fragment(struct llvmpipe_context *lp,
 619                   struct lp_fragment_shader *shader,
 620                   struct lp_fragment_shader_variant *variant,
 621                   unsigned do_tri_test)
 622 {
 623    struct llvmpipe_screen *screen = llvmpipe_screen(lp->pipe.screen);
 624    const struct lp_fragment_shader_variant_key *key = &variant->key;
 625    struct lp_type fs_type;
 626    struct lp_type blend_type;
 627    LLVMTypeRef fs_elem_type;
 628    LLVMTypeRef fs_vec_type;
 629    LLVMTypeRef fs_int_vec_type;
 630    LLVMTypeRef blend_vec_type;
 631    LLVMTypeRef blend_int_vec_type;
 632    LLVMTypeRef arg_types[15];
 633    LLVMTypeRef func_type;
 634    LLVMTypeRef int32_vec4_type = lp_build_int32_vec4_type();
 635    LLVMValueRef context_ptr;
 636    LLVMValueRef x;
 637    LLVMValueRef y;
 638    LLVMValueRef a0_ptr;
 639    LLVMValueRef dadx_ptr;
 640    LLVMValueRef dady_ptr;
 641    LLVMValueRef color_ptr_ptr;
 642    LLVMValueRef depth_ptr;
 643    LLVMValueRef c0, c1, c2, step0_ptr, step1_ptr, step2_ptr;
 644    LLVMBasicBlockRef block;
 645    LLVMBuilderRef builder;
 646    LLVMValueRef x0;
 647    LLVMValueRef y0;
 648    struct lp_build_sampler_soa *sampler;
 649    struct lp_build_interp_soa_context interp;
 650    LLVMValueRef fs_mask[LP_MAX_VECTOR_LENGTH];
 651    LLVMValueRef fs_out_color[PIPE_MAX_COLOR_BUFS][NUM_CHANNELS][LP_MAX_VECTOR_LENGTH];
 652    LLVMValueRef blend_mask;
 653    LLVMValueRef blend_in_color[NUM_CHANNELS];
 654    LLVMValueRef function;
 655    LLVMValueRef facing;
 656    unsigned num_fs;
 657    unsigned i;
 658    unsigned chan;
 659    unsigned cbuf;
 660
 661
 662    /* TODO: actually pick these based on the fs and color buffer
 663     * characteristics. */
 664
 665    memset(&fs_type, 0, sizeof fs_type);
 666    fs_type.floating = TRUE; /* floating point values */
 667    fs_type.sign = TRUE;     /* values are signed */
 668    fs_type.norm = FALSE;    /* values are not limited to [0,1] or [-1,1] */
 669    fs_type.width = 32;      /* 32-bit float */
 670    fs_type.length = 4;      /* 4 elements per vector */
 671    num_fs = 4;              /* number of quads per block */
 672
 673    memset(&blend_type, 0, sizeof blend_type);
 674    blend_type.floating = FALSE; /* values are integers */
 675    blend_type.sign = FALSE;     /* values are unsigned */
 676    blend_type.norm = TRUE;      /* values are in [0,1] or [-1,1] */
 677    blend_type.width = 8;        /* 8-bit ubyte values */
 678    blend_type.length = 16;      /* 16 elements per vector */
 679
 680    /*
 681     * Generate the function prototype. Any change here must be reflected in
 682     * lp_jit.h's lp_jit_frag_func function pointer type, and vice-versa.
 683     */
 684
 685    fs_elem_type = lp_build_elem_type(fs_type);
 686    fs_vec_type = lp_build_vec_type(fs_type);
 687    fs_int_vec_type = lp_build_int_vec_type(fs_type);
 688
 689    blend_vec_type = lp_build_vec_type(blend_type);
 690    blend_int_vec_type = lp_build_int_vec_type(blend_type);
 691
 692    arg_types[0] = screen->context_ptr_type;            /* context */
 693    arg_types[1] = LLVMInt32Type();                     /* x */
 694    arg_types[2] = LLVMInt32Type();                     /* y */
 695    arg_types[3] = LLVMFloatType();                     /* facing */
 696    arg_types[4] = LLVMPointerType(fs_elem_type, 0);    /* a0 */
 697    arg_types[5] = LLVMPointerType(fs_elem_type, 0);    /* dadx */
 698    arg_types[6] = LLVMPointerType(fs_elem_type, 0);    /* dady */
 699    arg_types[7] = LLVMPointerType(LLVMPointerType(blend_vec_type, 0), 0);  /* color */
 700    arg_types[8] = LLVMPointerType(fs_int_vec_type, 0); /* depth */
 701    arg_types[9] = LLVMInt32Type();                     /* c0 */
 702    arg_types[10] = LLVMInt32Type();                    /* c1 */
 703    arg_types[11] = LLVMInt32Type();                    /* c2 */
 704    /* Note: the step arrays are built as int32[16] but we interpret
 705     * them here as int32_vec4[4].
 706     */
 707    arg_types[12] = LLVMPointerType(int32_vec4_type, 0);/* step0 */
 708    arg_types[13] = LLVMPointerType(int32_vec4_type, 0);/* step1 */
 709    arg_types[14] = LLVMPointerType(int32_vec4_type, 0);/* step2 */
 710
 711    func_type = LLVMFunctionType(LLVMVoidType(), arg_types, Elements(arg_types), 0);
 712
 713    function = LLVMAddFunction(screen->module, "shader", func_type);
 714    LLVMSetFunctionCallConv(function, LLVMCCallConv);
 715
 716    variant->function[do_tri_test] = function;
 717
 718
 719    /* XXX: need to propagate noalias down into color param now we are
 720     * passing a pointer-to-pointer?
 721     */
 722    for(i = 0; i < Elements(arg_types); ++i)
 723       if(LLVMGetTypeKind(arg_types[i]) == LLVMPointerTypeKind)
 724          LLVMAddAttribute(LLVMGetParam(function, i), LLVMNoAliasAttribute);
 725
 726    context_ptr  = LLVMGetParam(function, 0);
 727    x            = LLVMGetParam(function, 1);
 728    y            = LLVMGetParam(function, 2);
 729    facing       = LLVMGetParam(function, 3);
 730    a0_ptr       = LLVMGetParam(function, 4);
 731    dadx_ptr     = LLVMGetParam(function, 5);
 732    dady_ptr     = LLVMGetParam(function, 6);
 733    color_ptr_ptr = LLVMGetParam(function, 7);
 734    depth_ptr    = LLVMGetParam(function, 8);
 735    c0           = LLVMGetParam(function, 9);
 736    c1           = LLVMGetParam(function, 10);
 737    c2           = LLVMGetParam(function, 11);
 738    step0_ptr    = LLVMGetParam(function, 12);
 739    step1_ptr    = LLVMGetParam(function, 13);
 740    step2_ptr    = LLVMGetParam(function, 14);
 741
 742    lp_build_name(context_ptr, "context");
 743    lp_build_name(x, "x");
 744    lp_build_name(y, "y");
 745    lp_build_name(a0_ptr, "a0");
 746    lp_build_name(dadx_ptr, "dadx");
 747    lp_build_name(dady_ptr, "dady");
 748    lp_build_name(color_ptr_ptr, "color_ptr");
 749    lp_build_name(depth_ptr, "depth");
 750    lp_build_name(c0, "c0");
 751    lp_build_name(c1, "c1");
 752    lp_build_name(c2, "c2");
 753    lp_build_name(step0_ptr, "step0");
 754    lp_build_name(step1_ptr, "step1");
 755    lp_build_name(step2_ptr, "step2");
 756
 757    /*
 758     * Function body
 759     */
 760
 761    block = LLVMAppendBasicBlock(function, "entry");
 762    builder = LLVMCreateBuilder();
 763    LLVMPositionBuilderAtEnd(builder, block);
 764
 765    generate_pos0(builder, x, y, &x0, &y0);
 766
 767    lp_build_interp_soa_init(&interp,
 768                             shader->base.tokens,
 769                             key->flatshade,
 770                             builder, fs_type,
 771                             a0_ptr, dadx_ptr, dady_ptr,
 772                             x0, y0);
 773
 774    /* code generated texture sampling */
 775    sampler = lp_llvm_sampler_soa_create(key->sampler, context_ptr);
 776
 777    /* loop over quads in the block */
 778    for(i = 0; i < num_fs; ++i) {
 779       LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
 780       LLVMValueRef out_color[PIPE_MAX_COLOR_BUFS][NUM_CHANNELS];
 781       LLVMValueRef depth_ptr_i;
 782       int cbuf;
 783
 784       if(i != 0)
 785          lp_build_interp_soa_update(&interp, i);
 786
 787       depth_ptr_i = LLVMBuildGEP(builder, depth_ptr, &index, 1, "");
 788
 789       generate_fs(lp, shader, key,
 790                   builder,
 791                   fs_type,
 792                   context_ptr,
 793                   i,
 794                   &interp,
 795                   sampler,
 796                   &fs_mask[i], /* output */
 797                   out_color,
 798                   depth_ptr_i,
 799                   facing,
 800                   do_tri_test,
 801                   c0, c1, c2,
 802                   step0_ptr, step1_ptr, step2_ptr);
 803
 804       for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++)
 805          for(chan = 0; chan < NUM_CHANNELS; ++chan)
 806             fs_out_color[cbuf][chan][i] = out_color[cbuf][chan];
 807    }
 808
 809    sampler->destroy(sampler);
 810
 811    /* Loop over color outputs / color buffers to do blending.
 812     */
 813    for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++) {
 814       LLVMValueRef color_ptr;
 815       LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), cbuf, 0);
 816
 817       /*
 818        * Convert the fs's output color and mask to fit to the blending type.
 819        */
 820       for(chan = 0; chan < NUM_CHANNELS; ++chan) {
 821          lp_build_conv(builder, fs_type, blend_type,
 822                        fs_out_color[cbuf][chan], num_fs,
 823                        &blend_in_color[chan], 1);
 824          lp_build_name(blend_in_color[chan], "color%d.%c", cbuf, "rgba"[chan]);
 825       }
 826
 827       lp_build_conv_mask(builder, fs_type, blend_type,
 828                          fs_mask, num_fs,
 829                          &blend_mask, 1);
 830
 831       color_ptr = LLVMBuildLoad(builder,
 832                                 LLVMBuildGEP(builder, color_ptr_ptr, &index, 1, ""),
 833                                 "");
 834       lp_build_name(color_ptr, "color_ptr%d", cbuf);
 835
 836       /*
 837        * Blending.
 838        */
 839       generate_blend(&key->blend,
 840                      builder,
 841                      blend_type,
 842                      context_ptr,
 843                      blend_mask,
 844                      blend_in_color,
 845                      color_ptr);
 846    }
 847
 848    LLVMBuildRetVoid(builder);
 849
 850    LLVMDisposeBuilder(builder);
 851
 852
 853    /* Verify the LLVM IR.  If invalid, dump and abort */
 854 #ifdef DEBUG
 855    if(LLVMVerifyFunction(function, LLVMPrintMessageAction)) {
 856       if (1)
 857          LLVMDumpValue(function);
 858       abort();
 859    }
 860 #endif
 861
 862    /* Apply optimizations to LLVM IR */
 863    if (1)
 864       LLVMRunFunctionPassManager(screen->pass, function);
 865
 866    if (LP_DEBUG & DEBUG_JIT) {
 867       /* Print the LLVM IR to stderr */
 868       LLVMDumpValue(function);
 869       debug_printf("\n");
 870    }
 871
 872    /*
 873     * Translate the LLVM IR into machine code.
 874     */
 875    {
 876       void *f = LLVMGetPointerToGlobal(screen->engine, function);
 877
 878       variant->jit_function[do_tri_test] = cast_voidptr_to_lp_jit_frag_func(f);
 879
 880       if (LP_DEBUG & DEBUG_ASM)
 881          lp_disassemble(f);
 882    }
 883 }
 884
 885
 886 static struct lp_fragment_shader_variant *
 887 generate_variant(struct llvmpipe_context *lp,
 888                  struct lp_fragment_shader *shader,
 889                  const struct lp_fragment_shader_variant_key *key)
 890 {
 891    struct lp_fragment_shader_variant *variant;
 892
 893    if (LP_DEBUG & DEBUG_JIT) {
 894       unsigned i;
 895
 896       tgsi_dump(shader->base.tokens, 0);
 897       if(key->depth.enabled) {
 898          debug_printf("depth.format = %s\n", util_format_name(key->zsbuf_format));
 899          debug_printf("depth.func = %s\n", util_dump_func(key->depth.func, TRUE));
 900          debug_printf("depth.writemask = %u\n", key->depth.writemask);
 901       }
 902       if(key->alpha.enabled) {
 903          debug_printf("alpha.func = %s\n", util_dump_func(key->alpha.func, TRUE));
 904          debug_printf("alpha.ref_value = %f\n", key->alpha.ref_value);
 905       }
 906       if(key->blend.logicop_enable) {
 907          debug_printf("blend.logicop_func = %u\n", key->blend.logicop_func);
 908       }
 909       else if(key->blend.rt[0].blend_enable) {
 910          debug_printf("blend.rgb_func = %s\n",   util_dump_blend_func  (key->blend.rt[0].rgb_func, TRUE));
 911          debug_printf("rgb_src_factor = %s\n",   util_dump_blend_factor(key->blend.rt[0].rgb_src_factor, TRUE));
 912          debug_printf("rgb_dst_factor = %s\n",   util_dump_blend_factor(key->blend.rt[0].rgb_dst_factor, TRUE));
 913          debug_printf("alpha_func = %s\n",       util_dump_blend_func  (key->blend.rt[0].alpha_func, TRUE));
 914          debug_printf("alpha_src_factor = %s\n", util_dump_blend_factor(key->blend.rt[0].alpha_src_factor, TRUE));
 915          debug_printf("alpha_dst_factor = %s\n", util_dump_blend_factor(key->blend.rt[0].alpha_dst_factor, TRUE));
 916       }
 917       debug_printf("blend.colormask = 0x%x\n", key->blend.rt[0].colormask);
 918       for(i = 0; i < PIPE_MAX_SAMPLERS; ++i) {
 919          if(key->sampler[i].format) {
 920             debug_printf("sampler[%u] = \n", i);
 921             debug_printf("  .format = %s\n",
 922                          util_format_name(key->sampler[i].format));
 923             debug_printf("  .target = %s\n",
 924                          util_dump_tex_target(key->sampler[i].target, TRUE));
 925             debug_printf("  .pot = %u %u %u\n",
 926                          key->sampler[i].pot_width,
 927                          key->sampler[i].pot_height,
 928                          key->sampler[i].pot_depth);
 929             debug_printf("  .wrap = %s %s %s\n",
 930                          util_dump_tex_wrap(key->sampler[i].wrap_s, TRUE),
 931                          util_dump_tex_wrap(key->sampler[i].wrap_t, TRUE),
 932                          util_dump_tex_wrap(key->sampler[i].wrap_r, TRUE));
 933             debug_printf("  .min_img_filter = %s\n",
 934                          util_dump_tex_filter(key->sampler[i].min_img_filter, TRUE));
 935             debug_printf("  .min_mip_filter = %s\n",
 936                          util_dump_tex_mipfilter(key->sampler[i].min_mip_filter, TRUE));
 937             debug_printf("  .mag_img_filter = %s\n",
 938                          util_dump_tex_filter(key->sampler[i].mag_img_filter, TRUE));
 939             if(key->sampler[i].compare_mode != PIPE_TEX_COMPARE_NONE)
 940                debug_printf("  .compare_func = %s\n", util_dump_func(key->sampler[i].compare_func, TRUE));
 941             debug_printf("  .normalized_coords = %u\n", key->sampler[i].normalized_coords);
 942          }
 943       }
 944    }
 945
 946    variant = CALLOC_STRUCT(lp_fragment_shader_variant);
 947    if(!variant)
 948       return NULL;
 949
 950    variant->shader = shader;
 951    memcpy(&variant->key, key, sizeof *key);
 952
 953    generate_fragment(lp, shader, variant, 0);
 954    generate_fragment(lp, shader, variant, 1);
 955
 956    /* insert new variant into linked list */
 957    variant->next = shader->variants;
 958    shader->variants = variant;
 959
 960    return variant;
 961 }
 962
 963
 964 void *
 965 llvmpipe_create_fs_state(struct pipe_context *pipe,
 966                          const struct pipe_shader_state *templ)
 967 {
 968    struct lp_fragment_shader *shader;
 969
 970    shader = CALLOC_STRUCT(lp_fragment_shader);
 971    if (!shader)
 972       return NULL;
 973
 974    /* get/save the summary info for this shader */
 975    tgsi_scan_shader(templ->tokens, &shader->info);
 976
 977    /* we need to keep a local copy of the tokens */
 978    shader->base.tokens = tgsi_dup_tokens(templ->tokens);
 979
 980    return shader;
 981 }
 982
 983
 984 void
 985 llvmpipe_bind_fs_state(struct pipe_context *pipe, void *fs)
 986 {
 987    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
 988
 989    if (llvmpipe->fs == fs)
 990       return;
 991
 992    draw_flush(llvmpipe->draw);
 993
 994    llvmpipe->fs = fs;
 995
 996    llvmpipe->dirty |= LP_NEW_FS;
 997 }
 998
 999
1000 void
1001 llvmpipe_delete_fs_state(struct pipe_context *pipe, void *fs)
1002 {
1003    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
1004    struct llvmpipe_screen *screen = llvmpipe_screen(pipe->screen);
1005    struct lp_fragment_shader *shader = fs;
1006    struct lp_fragment_shader_variant *variant;
1007
1008    assert(fs != llvmpipe->fs);
1009    (void) llvmpipe;
1010
1011    /*
1012     * XXX: we need to flush the context until we have some sort of reference
1013     * counting in fragment shaders as they may still be binned
1014     */
1015    draw_flush(llvmpipe->draw);
1016    lp_setup_flush(llvmpipe->setup, 0);
1017
1018    variant = shader->variants;
1019    while(variant) {
1020       struct lp_fragment_shader_variant *next = variant->next;
1021       unsigned i;
1022
1023       for (i = 0; i < Elements(variant->function); i++) {
1024          if (variant->function[i]) {
1025             if (variant->jit_function[i])
1026                LLVMFreeMachineCodeForFunction(screen->engine,
1027                                               variant->function[i]);
1028             LLVMDeleteFunction(variant->function[i]);
1029          }
1030       }
1031
1032       FREE(variant);
1033
1034       variant = next;
1035    }
1036
1037    FREE((void *) shader->base.tokens);
1038    FREE(shader);
1039 }
1040
1041
1042
1043 void
1044 llvmpipe_set_constant_buffer(struct pipe_context *pipe,
1045                              uint shader, uint index,
1046                              struct pipe_resource *constants)
1047 {
1048    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
1049    unsigned size = constants ? constants->width0 : 0;
1050    const void *data = constants ? llvmpipe_resource(constants)->data : NULL;
1051
1052    assert(shader < PIPE_SHADER_TYPES);
1053    assert(index == 0);
1054
1055    if(llvmpipe->constants[shader] == constants)
1056       return;
1057
1058    draw_flush(llvmpipe->draw);
1059
1060    /* note: reference counting */
1061    pipe_resource_reference(&llvmpipe->constants[shader], constants);
1062
1063    if(shader == PIPE_SHADER_VERTEX) {
1064       draw_set_mapped_constant_buffer(llvmpipe->draw, PIPE_SHADER_VERTEX, 0,
1065                                       data, size);
1066    }
1067
1068    llvmpipe->dirty |= LP_NEW_CONSTANTS;
1069 }
1070
1071
1072 /**
1073  * We need to generate several variants of the fragment pipeline to match
1074  * all the combinations of the contributing state atoms.
1075  *
1076  * TODO: there is actually no reason to tie this to context state -- the
1077  * generated code could be cached globally in the screen.
1078  */
1079 static void
1080 make_variant_key(struct llvmpipe_context *lp,
1081                  struct lp_fragment_shader *shader,
1082                  struct lp_fragment_shader_variant_key *key)
1083 {
1084    unsigned i;
1085
1086    memset(key, 0, sizeof *key);
1087
1088    if (lp->framebuffer.zsbuf) {
1089       if (lp->depth_stencil->depth.enabled) {
1090          key->zsbuf_format = lp->framebuffer.zsbuf->format;
1091          memcpy(&key->depth, &lp->depth_stencil->depth, sizeof key->depth);
1092       }
1093       if (lp->depth_stencil->stencil[0].enabled) {
1094          key->zsbuf_format = lp->framebuffer.zsbuf->format;
1095          memcpy(&key->stencil, &lp->depth_stencil->stencil, sizeof key->stencil);
1096       }
1097    }
1098
1099    key->alpha.enabled = lp->depth_stencil->alpha.enabled;
1100    if(key->alpha.enabled)
1101       key->alpha.func = lp->depth_stencil->alpha.func;
1102    /* alpha.ref_value is passed in jit_context */
1103
1104    key->flatshade = lp->rasterizer->flatshade;
1105    key->scissor = lp->rasterizer->scissor;
1106
1107    if (lp->framebuffer.nr_cbufs) {
1108       memcpy(&key->blend, lp->blend, sizeof key->blend);
1109    }
1110
1111    key->nr_cbufs = lp->framebuffer.nr_cbufs;
1112    for (i = 0; i < lp->framebuffer.nr_cbufs; i++) {
1113       const struct util_format_description *format_desc;
1114       unsigned chan;
1115
1116       format_desc = util_format_description(lp->framebuffer.cbufs[i]->format);
1117       assert(format_desc->layout == UTIL_FORMAT_COLORSPACE_RGB ||
1118              format_desc->layout == UTIL_FORMAT_COLORSPACE_SRGB);
1119
1120       /* mask out color channels not present in the color buffer.
1121        * Should be simple to incorporate per-cbuf writemasks:
1122        */
1123       for(chan = 0; chan < 4; ++chan) {
1124          enum util_format_swizzle swizzle = format_desc->swizzle[chan];
1125
1126          if(swizzle <= UTIL_FORMAT_SWIZZLE_W)
1127             key->blend.rt[0].colormask |= (1 << chan);
1128       }
1129    }
1130
1131    for(i = 0; i < PIPE_MAX_SAMPLERS; ++i)
1132       if(shader->info.file_mask[TGSI_FILE_SAMPLER] & (1 << i))
1133          lp_sampler_static_state(&key->sampler[i], lp->fragment_sampler_views[i]->texture, lp->sampler[i]);
1134 }
1135
1136
1137 /**
1138  * Update fragment state.  This is called just prior to drawing
1139  * something when some fragment-related state has changed.
1140  */
1141 void
1142 llvmpipe_update_fs(struct llvmpipe_context *lp)
1143 {
1144    struct lp_fragment_shader *shader = lp->fs;
1145    struct lp_fragment_shader_variant_key key;
1146    struct lp_fragment_shader_variant *variant;
1147    boolean opaque;
1148
1149    make_variant_key(lp, shader, &key);
1150
1151    variant = shader->variants;
1152    while(variant) {
1153       if(memcmp(&variant->key, &key, sizeof key) == 0)
1154          break;
1155
1156       variant = variant->next;
1157    }
1158
1159    if (!variant) {
1160       int64_t t0, t1;
1161       int64_t dt;
1162       t0 = os_time_get();
1163
1164       variant = generate_variant(lp, shader, &key);
1165
1166       t1 = os_time_get();
1167       dt = t1 - t0;
1168       LP_COUNT_ADD(llvm_compile_time, dt);
1169       LP_COUNT_ADD(nr_llvm_compiles, 2);  /* emit vs. omit in/out test */
1170    }
1171
1172    shader->current = variant;
1173
1174    /* TODO: put this in the variant */
1175    /* TODO: most of these can be relaxed, in particular the colormask */
1176    opaque = !key.blend.logicop_enable &&
1177             !key.blend.rt[0].blend_enable &&
1178             key.blend.rt[0].colormask == 0xf &&
1179             !key.stencil[0].enabled &&
1180             !key.alpha.enabled &&
1181             !key.depth.enabled &&
1182             !key.scissor &&
1183             !shader->info.uses_kill
1184             ? TRUE : FALSE;
1185
1186    lp_setup_set_fs_functions(lp->setup,
1187                              shader->current->jit_function[RAST_WHOLE],
1188                              shader->current->jit_function[RAST_EDGE_TEST],
1189                              opaque);
1190 }