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  * - early depth test
  35  * - fragment shader
  36  * - alpha test
  37  * - depth/stencil test
  38  * - blending
  39  *
  40  * This file has only the glue to assemble the fragment pipeline.  The actual
  41  * plumbing of converting Gallium state into LLVM IR is done elsewhere, in the
  42  * lp_bld_*.[ch] files, and in a complete generic and reusable way. Here we
  43  * muster the LLVM JIT execution engine to create a function that follows an
  44  * established binary interface and that can be called from C directly.
  45  *
  46  * A big source of complexity here is that we often want to run different
  47  * stages with different precisions and data types and precisions. For example,
  48  * the fragment shader needs typically to be done in floats, but the
  49  * depth/stencil test and blending is better done in the type that most closely
  50  * matches the depth/stencil and color buffer respectively.
  51  *
  52  * Since the width of a SIMD vector register stays the same regardless of the
  53  * element type, different types imply different number of elements, so we must
  54  * code generate more instances of the stages with larger types to be able to
  55  * feed/consume the stages with smaller types.
  56  *
  57  * @author Jose Fonseca <jfonseca@vmware.com>
  58  */
  59
  60 #include <limits.h>
  61 #include "pipe/p_defines.h"
  62 #include "util/u_inlines.h"
  63 #include "util/u_memory.h"
  64 #include "util/u_pointer.h"
  65 #include "util/u_format.h"
  66 #include "util/u_dump.h"
  67 #include "util/u_string.h"
  68 #include "util/u_simple_list.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_init.h"
  79 #include "gallivm/lp_bld_intr.h"
  80 #include "gallivm/lp_bld_logic.h"
  81 #include "gallivm/lp_bld_tgsi.h"
  82 #include "gallivm/lp_bld_swizzle.h"
  83 #include "gallivm/lp_bld_flow.h"
  84 #include "gallivm/lp_bld_debug.h"
  85
  86 #include "lp_bld_alpha.h"
  87 #include "lp_bld_blend.h"
  88 #include "lp_bld_depth.h"
  89 #include "lp_bld_interp.h"
  90 #include "lp_context.h"
  91 #include "lp_debug.h"
  92 #include "lp_perf.h"
  93 #include "lp_screen.h"
  94 #include "lp_setup.h"
  95 #include "lp_state.h"
  96 #include "lp_tex_sample.h"
  97 #include "lp_flush.h"
  98 #include "lp_state_fs.h"
  99
 100
 101 #include <llvm-c/Analysis.h>
 102
 103
 104 static unsigned fs_no = 0;
 105
 106
 107 /**
 108  * Generate the depth /stencil test code.
 109  */
 110 static void
 111 generate_depth_stencil(LLVMBuilderRef builder,
 112                        const struct lp_fragment_shader_variant_key *key,
 113                        struct lp_type src_type,
 114                        struct lp_build_mask_context *mask,
 115                        LLVMValueRef stencil_refs[2],
 116                        LLVMValueRef src,
 117                        LLVMValueRef dst_ptr,
 118                        LLVMValueRef facing,
 119                        LLVMValueRef counter)
 120 {
 121    const struct util_format_description *format_desc;
 122    struct lp_type dst_type;
 123
 124    if (!key->depth.enabled && !key->stencil[0].enabled && !key->stencil[1].enabled)
 125       return;
 126
 127    format_desc = util_format_description(key->zsbuf_format);
 128    assert(format_desc);
 129
 130    /*
 131     * Depths are expected to be between 0 and 1, even if they are stored in
 132     * floats. Setting these bits here will ensure that the lp_build_conv() call
 133     * below won't try to unnecessarily clamp the incoming values.
 134     */
 135    if(src_type.floating) {
 136       src_type.sign = FALSE;
 137       src_type.norm = TRUE;
 138    }
 139    else {
 140       assert(!src_type.sign);
 141       assert(src_type.norm);
 142    }
 143
 144    /* Pick the depth type. */
 145    dst_type = lp_depth_type(format_desc, src_type.width*src_type.length);
 146
 147    /* FIXME: Cope with a depth test type with a different bit width. */
 148    assert(dst_type.width == src_type.width);
 149    assert(dst_type.length == src_type.length);
 150
 151    /* Convert fragment Z from float to integer */
 152    lp_build_conv(builder, src_type, dst_type, &src, 1, &src, 1);
 153
 154    dst_ptr = LLVMBuildBitCast(builder,
 155                               dst_ptr,
 156                               LLVMPointerType(lp_build_vec_type(dst_type), 0), "");
 157    lp_build_depth_stencil_test(builder,
 158                                &key->depth,
 159                                key->stencil,
 160                                dst_type,
 161                                format_desc,
 162                                mask,
 163                                stencil_refs,
 164                                src,
 165                                dst_ptr,
 166                                facing,
 167                                counter);
 168 }
 169
 170
 171 /**
 172  * Expand the relevent bits of mask_input to a 4-dword mask for the
 173  * four pixels in a 2x2 quad.  This will set the four elements of the
 174  * quad mask vector to 0 or ~0.
 175  *
 176  * \param quad  which quad of the quad group to test, in [0,3]
 177  * \param mask_input  bitwise mask for the whole 4x4 stamp
 178  */
 179 static LLVMValueRef
 180 generate_quad_mask(LLVMBuilderRef builder,
 181                    struct lp_type fs_type,
 182                    unsigned quad,
 183                    LLVMValueRef mask_input) /* int32 */
 184 {
 185    struct lp_type mask_type;
 186    LLVMTypeRef i32t = LLVMInt32Type();
 187    LLVMValueRef bits[4];
 188    LLVMValueRef mask;
 189
 190    /*
 191     * XXX: We'll need a different path for 16 x u8
 192     */
 193    assert(fs_type.width == 32);
 194    assert(fs_type.length == 4);
 195    mask_type = lp_int_type(fs_type);
 196
 197    /*
 198     * mask_input >>= (quad * 4)
 199     */
 200
 201    mask_input = LLVMBuildLShr(builder,
 202                               mask_input,
 203                               LLVMConstInt(i32t, quad * 4, 0),
 204                               "");
 205
 206    /*
 207     * mask = { mask_input & (1 << i), for i in [0,3] }
 208     */
 209
 210    mask = lp_build_broadcast(builder, lp_build_vec_type(mask_type), mask_input);
 211
 212    bits[0] = LLVMConstInt(i32t, 1 << 0, 0);
 213    bits[1] = LLVMConstInt(i32t, 1 << 1, 0);
 214    bits[2] = LLVMConstInt(i32t, 1 << 2, 0);
 215    bits[3] = LLVMConstInt(i32t, 1 << 3, 0);
 216
 217    mask = LLVMBuildAnd(builder, mask, LLVMConstVector(bits, 4), "");
 218
 219    /*
 220     * mask = mask != 0 ? ~0 : 0
 221     */
 222
 223    mask = lp_build_compare(builder,
 224                            mask_type, PIPE_FUNC_NOTEQUAL,
 225                            mask,
 226                            lp_build_const_int_vec(mask_type, 0));
 227
 228    return mask;
 229 }
 230
 231
 232
 233 /**
 234  * Generate the fragment shader, depth/stencil test, and alpha tests.
 235  * \param i  which quad in the tile, in range [0,3]
 236  * \param partial_mask  if 1, do mask_input testing
 237  */
 238 static void
 239 generate_fs(struct llvmpipe_context *lp,
 240             struct lp_fragment_shader *shader,
 241             const struct lp_fragment_shader_variant_key *key,
 242             LLVMBuilderRef builder,
 243             struct lp_type type,
 244             LLVMValueRef context_ptr,
 245             unsigned i,
 246             const struct lp_build_interp_soa_context *interp,
 247             struct lp_build_sampler_soa *sampler,
 248             LLVMValueRef *pmask,
 249             LLVMValueRef (*color)[4],
 250             LLVMValueRef depth_ptr,
 251             LLVMValueRef facing,
 252             unsigned partial_mask,
 253             LLVMValueRef mask_input,
 254             LLVMValueRef counter)
 255 {
 256    const struct tgsi_token *tokens = shader->base.tokens;
 257    LLVMTypeRef vec_type;
 258    LLVMValueRef consts_ptr;
 259    LLVMValueRef outputs[PIPE_MAX_SHADER_OUTPUTS][NUM_CHANNELS];
 260    LLVMValueRef z = interp->pos[2];
 261    LLVMValueRef stencil_refs[2];
 262    struct lp_build_flow_context *flow;
 263    struct lp_build_mask_context mask;
 264    boolean early_depth_stencil_test;
 265    unsigned attrib;
 266    unsigned chan;
 267    unsigned cbuf;
 268
 269    assert(i < 4);
 270
 271    stencil_refs[0] = lp_jit_context_stencil_ref_front_value(builder, context_ptr);
 272    stencil_refs[1] = lp_jit_context_stencil_ref_back_value(builder, context_ptr);
 273
 274    vec_type = lp_build_vec_type(type);
 275
 276    consts_ptr = lp_jit_context_constants(builder, context_ptr);
 277
 278    flow = lp_build_flow_create(builder);
 279
 280    memset(outputs, 0, sizeof outputs);
 281
 282    lp_build_flow_scope_begin(flow);
 283
 284    /* Declare the color and z variables */
 285    for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++) {
 286       for(chan = 0; chan < NUM_CHANNELS; ++chan) {
 287          color[cbuf][chan] = LLVMGetUndef(vec_type);
 288          lp_build_flow_scope_declare(flow, &color[cbuf][chan]);
 289       }
 290    }
 291    lp_build_flow_scope_declare(flow, &z);
 292
 293    /* do triangle edge testing */
 294    if (partial_mask) {
 295       *pmask = generate_quad_mask(builder, type,
 296                                   i, mask_input);
 297    }
 298    else {
 299       *pmask = lp_build_const_int_vec(type, ~0);
 300    }
 301
 302    /* 'mask' will control execution based on quad's pixel alive/killed state */
 303    lp_build_mask_begin(&mask, flow, type, *pmask);
 304
 305    early_depth_stencil_test =
 306       (key->depth.enabled || key->stencil[0].enabled) &&
 307       !key->alpha.enabled &&
 308       !shader->info.uses_kill &&
 309       !shader->info.writes_z;
 310
 311    if (early_depth_stencil_test)
 312       generate_depth_stencil(builder, key,
 313                              type, &mask,
 314                              stencil_refs, z, depth_ptr, facing, counter);
 315
 316    lp_build_tgsi_soa(builder, tokens, type, &mask,
 317                      consts_ptr, interp->pos, interp->inputs,
 318                      outputs, sampler, &shader->info);
 319
 320    /* loop over fragment shader outputs/results */
 321    for (attrib = 0; attrib < shader->info.num_outputs; ++attrib) {
 322       for(chan = 0; chan < NUM_CHANNELS; ++chan) {
 323          if(outputs[attrib][chan]) {
 324             LLVMValueRef out = LLVMBuildLoad(builder, outputs[attrib][chan], "");
 325             lp_build_name(out, "output%u.%u.%c", i, attrib, "xyzw"[chan]);
 326
 327             switch (shader->info.output_semantic_name[attrib]) {
 328             case TGSI_SEMANTIC_COLOR:
 329                {
 330                   unsigned cbuf = shader->info.output_semantic_index[attrib];
 331
 332                   lp_build_name(out, "color%u.%u.%c", i, attrib, "rgba"[chan]);
 333
 334                   /* Alpha test */
 335                   /* XXX: should the alpha reference value be passed separately? */
 336                   /* XXX: should only test the final assignment to alpha */
 337                   if(cbuf == 0 && chan == 3) {
 338                      LLVMValueRef alpha = out;
 339                      LLVMValueRef alpha_ref_value;
 340                      alpha_ref_value = lp_jit_context_alpha_ref_value(builder, context_ptr);
 341                      alpha_ref_value = lp_build_broadcast(builder, vec_type, alpha_ref_value);
 342                      lp_build_alpha_test(builder, &key->alpha, type,
 343                                          &mask, alpha, alpha_ref_value);
 344                   }
 345
 346                   color[cbuf][chan] = out;
 347                   break;
 348                }
 349
 350             case TGSI_SEMANTIC_POSITION:
 351                if(chan == 2)
 352                   z = out;
 353                break;
 354             }
 355          }
 356       }
 357    }
 358
 359    if (!early_depth_stencil_test)
 360       generate_depth_stencil(builder, key,
 361                              type, &mask,
 362                              stencil_refs, z, depth_ptr, facing, counter);
 363
 364    lp_build_mask_end(&mask);
 365
 366    lp_build_flow_scope_end(flow);
 367
 368    lp_build_flow_destroy(flow);
 369
 370    *pmask = mask.value;
 371
 372 }
 373
 374
 375 /**
 376  * Generate color blending and color output.
 377  * \param rt  the render target index (to index blend, colormask state)
 378  * \param type  the pixel color type
 379  * \param context_ptr  pointer to the runtime JIT context
 380  * \param mask  execution mask (active fragment/pixel mask)
 381  * \param src  colors from the fragment shader
 382  * \param dst_ptr  the destination color buffer pointer
 383  */
 384 static void
 385 generate_blend(const struct pipe_blend_state *blend,
 386                unsigned rt,
 387                LLVMBuilderRef builder,
 388                struct lp_type type,
 389                LLVMValueRef context_ptr,
 390                LLVMValueRef mask,
 391                LLVMValueRef *src,
 392                LLVMValueRef dst_ptr)
 393 {
 394    struct lp_build_context bld;
 395    struct lp_build_flow_context *flow;
 396    struct lp_build_mask_context mask_ctx;
 397    LLVMTypeRef vec_type;
 398    LLVMValueRef const_ptr;
 399    LLVMValueRef con[4];
 400    LLVMValueRef dst[4];
 401    LLVMValueRef res[4];
 402    unsigned chan;
 403
 404    lp_build_context_init(&bld, builder, type);
 405
 406    flow = lp_build_flow_create(builder);
 407
 408    /* we'll use this mask context to skip blending if all pixels are dead */
 409    lp_build_mask_begin(&mask_ctx, flow, type, mask);
 410
 411    vec_type = lp_build_vec_type(type);
 412
 413    const_ptr = lp_jit_context_blend_color(builder, context_ptr);
 414    const_ptr = LLVMBuildBitCast(builder, const_ptr,
 415                                 LLVMPointerType(vec_type, 0), "");
 416
 417    /* load constant blend color and colors from the dest color buffer */
 418    for(chan = 0; chan < 4; ++chan) {
 419       LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), chan, 0);
 420       con[chan] = LLVMBuildLoad(builder, LLVMBuildGEP(builder, const_ptr, &index, 1, ""), "");
 421
 422       dst[chan] = LLVMBuildLoad(builder, LLVMBuildGEP(builder, dst_ptr, &index, 1, ""), "");
 423
 424       lp_build_name(con[chan], "con.%c", "rgba"[chan]);
 425       lp_build_name(dst[chan], "dst.%c", "rgba"[chan]);
 426    }
 427
 428    /* do blend */
 429    lp_build_blend_soa(builder, blend, type, rt, src, dst, con, res);
 430
 431    /* store results to color buffer */
 432    for(chan = 0; chan < 4; ++chan) {
 433       if(blend->rt[rt].colormask & (1 << chan)) {
 434          LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), chan, 0);
 435          lp_build_name(res[chan], "res.%c", "rgba"[chan]);
 436          res[chan] = lp_build_select(&bld, mask, res[chan], dst[chan]);
 437          LLVMBuildStore(builder, res[chan], LLVMBuildGEP(builder, dst_ptr, &index, 1, ""));
 438       }
 439    }
 440
 441    lp_build_mask_end(&mask_ctx);
 442    lp_build_flow_destroy(flow);
 443 }
 444
 445
 446 /**
 447  * Generate the runtime callable function for the whole fragment pipeline.
 448  * Note that the function which we generate operates on a block of 16
 449  * pixels at at time.  The block contains 2x2 quads.  Each quad contains
 450  * 2x2 pixels.
 451  */
 452 static void
 453 generate_fragment(struct llvmpipe_context *lp,
 454                   struct lp_fragment_shader *shader,
 455                   struct lp_fragment_shader_variant *variant,
 456                   unsigned partial_mask)
 457 {
 458    struct llvmpipe_screen *screen = llvmpipe_screen(lp->pipe.screen);
 459    const struct lp_fragment_shader_variant_key *key = &variant->key;
 460    char func_name[256];
 461    struct lp_type fs_type;
 462    struct lp_type blend_type;
 463    LLVMTypeRef fs_elem_type;
 464    LLVMTypeRef fs_int_vec_type;
 465    LLVMTypeRef blend_vec_type;
 466    LLVMTypeRef arg_types[11];
 467    LLVMTypeRef func_type;
 468    LLVMValueRef context_ptr;
 469    LLVMValueRef x;
 470    LLVMValueRef y;
 471    LLVMValueRef a0_ptr;
 472    LLVMValueRef dadx_ptr;
 473    LLVMValueRef dady_ptr;
 474    LLVMValueRef color_ptr_ptr;
 475    LLVMValueRef depth_ptr;
 476    LLVMValueRef mask_input;
 477    LLVMValueRef counter = NULL;
 478    LLVMBasicBlockRef block;
 479    LLVMBuilderRef builder;
 480    struct lp_build_sampler_soa *sampler;
 481    struct lp_build_interp_soa_context interp;
 482    LLVMValueRef fs_mask[LP_MAX_VECTOR_LENGTH];
 483    LLVMValueRef fs_out_color[PIPE_MAX_COLOR_BUFS][NUM_CHANNELS][LP_MAX_VECTOR_LENGTH];
 484    LLVMValueRef blend_mask;
 485    LLVMValueRef function;
 486    LLVMValueRef facing;
 487    unsigned num_fs;
 488    unsigned i;
 489    unsigned chan;
 490    unsigned cbuf;
 491
 492
 493    /* TODO: actually pick these based on the fs and color buffer
 494     * characteristics. */
 495
 496    memset(&fs_type, 0, sizeof fs_type);
 497    fs_type.floating = TRUE; /* floating point values */
 498    fs_type.sign = TRUE;     /* values are signed */
 499    fs_type.norm = FALSE;    /* values are not limited to [0,1] or [-1,1] */
 500    fs_type.width = 32;      /* 32-bit float */
 501    fs_type.length = 4;      /* 4 elements per vector */
 502    num_fs = 4;              /* number of quads per block */
 503
 504    memset(&blend_type, 0, sizeof blend_type);
 505    blend_type.floating = FALSE; /* values are integers */
 506    blend_type.sign = FALSE;     /* values are unsigned */
 507    blend_type.norm = TRUE;      /* values are in [0,1] or [-1,1] */
 508    blend_type.width = 8;        /* 8-bit ubyte values */
 509    blend_type.length = 16;      /* 16 elements per vector */
 510
 511    /*
 512     * Generate the function prototype. Any change here must be reflected in
 513     * lp_jit.h's lp_jit_frag_func function pointer type, and vice-versa.
 514     */
 515
 516    fs_elem_type = lp_build_elem_type(fs_type);
 517    fs_int_vec_type = lp_build_int_vec_type(fs_type);
 518
 519    blend_vec_type = lp_build_vec_type(blend_type);
 520
 521    util_snprintf(func_name, sizeof(func_name), "fs%u_variant%u_%s",
 522                  shader->no, variant->no, partial_mask ? "partial" : "whole");
 523
 524    arg_types[0] = screen->context_ptr_type;            /* context */
 525    arg_types[1] = LLVMInt32Type();                     /* x */
 526    arg_types[2] = LLVMInt32Type();                     /* y */
 527    arg_types[3] = LLVMFloatType();                     /* facing */
 528    arg_types[4] = LLVMPointerType(fs_elem_type, 0);    /* a0 */
 529    arg_types[5] = LLVMPointerType(fs_elem_type, 0);    /* dadx */
 530    arg_types[6] = LLVMPointerType(fs_elem_type, 0);    /* dady */
 531    arg_types[7] = LLVMPointerType(LLVMPointerType(blend_vec_type, 0), 0);  /* color */
 532    arg_types[8] = LLVMPointerType(fs_int_vec_type, 0); /* depth */
 533    arg_types[9] = LLVMInt32Type();                     /* mask_input */
 534    arg_types[10] = LLVMPointerType(LLVMInt32Type(), 0);/* counter */
 535
 536    func_type = LLVMFunctionType(LLVMVoidType(), arg_types, Elements(arg_types), 0);
 537
 538    function = LLVMAddFunction(screen->module, func_name, func_type);
 539    LLVMSetFunctionCallConv(function, LLVMCCallConv);
 540
 541    variant->function[partial_mask] = function;
 542
 543
 544    /* XXX: need to propagate noalias down into color param now we are
 545     * passing a pointer-to-pointer?
 546     */
 547    for(i = 0; i < Elements(arg_types); ++i)
 548       if(LLVMGetTypeKind(arg_types[i]) == LLVMPointerTypeKind)
 549          LLVMAddAttribute(LLVMGetParam(function, i), LLVMNoAliasAttribute);
 550
 551    context_ptr  = LLVMGetParam(function, 0);
 552    x            = LLVMGetParam(function, 1);
 553    y            = LLVMGetParam(function, 2);
 554    facing       = LLVMGetParam(function, 3);
 555    a0_ptr       = LLVMGetParam(function, 4);
 556    dadx_ptr     = LLVMGetParam(function, 5);
 557    dady_ptr     = LLVMGetParam(function, 6);
 558    color_ptr_ptr = LLVMGetParam(function, 7);
 559    depth_ptr    = LLVMGetParam(function, 8);
 560    mask_input   = LLVMGetParam(function, 9);
 561
 562    lp_build_name(context_ptr, "context");
 563    lp_build_name(x, "x");
 564    lp_build_name(y, "y");
 565    lp_build_name(a0_ptr, "a0");
 566    lp_build_name(dadx_ptr, "dadx");
 567    lp_build_name(dady_ptr, "dady");
 568    lp_build_name(color_ptr_ptr, "color_ptr_ptr");
 569    lp_build_name(depth_ptr, "depth");
 570    lp_build_name(mask_input, "mask_input");
 571
 572    if (key->occlusion_count) {
 573       counter = LLVMGetParam(function, 10);
 574       lp_build_name(counter, "counter");
 575    }
 576
 577    /*
 578     * Function body
 579     */
 580
 581    block = LLVMAppendBasicBlock(function, "entry");
 582    builder = LLVMCreateBuilder();
 583    LLVMPositionBuilderAtEnd(builder, block);
 584
 585    /*
 586     * The shader input interpolation info is not explicitely baked in the
 587     * shader key, but everything it derives from (TGSI, and flatshade) is
 588     * already included in the shader key.
 589     */
 590    lp_build_interp_soa_init(&interp,
 591                             lp->num_inputs,
 592                             lp->inputs,
 593                             builder, fs_type,
 594                             a0_ptr, dadx_ptr, dady_ptr,
 595                             x, y);
 596
 597    /* code generated texture sampling */
 598    sampler = lp_llvm_sampler_soa_create(key->sampler, context_ptr);
 599
 600    /* loop over quads in the block */
 601    for(i = 0; i < num_fs; ++i) {
 602       LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
 603       LLVMValueRef out_color[PIPE_MAX_COLOR_BUFS][NUM_CHANNELS];
 604       LLVMValueRef depth_ptr_i;
 605
 606       if(i != 0)
 607          lp_build_interp_soa_update(&interp, i);
 608
 609       depth_ptr_i = LLVMBuildGEP(builder, depth_ptr, &index, 1, "");
 610
 611       generate_fs(lp, shader, key,
 612                   builder,
 613                   fs_type,
 614                   context_ptr,
 615                   i,
 616                   &interp,
 617                   sampler,
 618                   &fs_mask[i], /* output */
 619                   out_color,
 620                   depth_ptr_i,
 621                   facing,
 622                   partial_mask,
 623                   mask_input,
 624                   counter);
 625
 626       for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++)
 627          for(chan = 0; chan < NUM_CHANNELS; ++chan)
 628             fs_out_color[cbuf][chan][i] = out_color[cbuf][chan];
 629    }
 630
 631    sampler->destroy(sampler);
 632
 633    /* Loop over color outputs / color buffers to do blending.
 634     */
 635    for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++) {
 636       LLVMValueRef color_ptr;
 637       LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), cbuf, 0);
 638       LLVMValueRef blend_in_color[NUM_CHANNELS];
 639       unsigned rt;
 640
 641       /*
 642        * Convert the fs's output color and mask to fit to the blending type.
 643        */
 644       for(chan = 0; chan < NUM_CHANNELS; ++chan) {
 645          lp_build_conv(builder, fs_type, blend_type,
 646                        fs_out_color[cbuf][chan], num_fs,
 647                        &blend_in_color[chan], 1);
 648          lp_build_name(blend_in_color[chan], "color%d.%c", cbuf, "rgba"[chan]);
 649       }
 650
 651       if (partial_mask || !variant->opaque) {
 652          lp_build_conv_mask(builder, fs_type, blend_type,
 653                             fs_mask, num_fs,
 654                             &blend_mask, 1);
 655       } else {
 656          blend_mask = lp_build_const_int_vec(blend_type, ~0);
 657       }
 658
 659       color_ptr = LLVMBuildLoad(builder,
 660                                 LLVMBuildGEP(builder, color_ptr_ptr, &index, 1, ""),
 661                                 "");
 662       lp_build_name(color_ptr, "color_ptr%d", cbuf);
 663
 664       /* which blend/colormask state to use */
 665       rt = key->blend.independent_blend_enable ? cbuf : 0;
 666
 667       /*
 668        * Blending.
 669        */
 670       generate_blend(&key->blend,
 671                      rt,
 672                      builder,
 673                      blend_type,
 674                      context_ptr,
 675                      blend_mask,
 676                      blend_in_color,
 677                      color_ptr);
 678    }
 679
 680 #ifdef PIPE_ARCH_X86
 681    /* Avoid corrupting the FPU stack on 32bit OSes. */
 682    lp_build_intrinsic(builder, "llvm.x86.mmx.emms", LLVMVoidType(), NULL, 0);
 683 #endif
 684
 685    LLVMBuildRetVoid(builder);
 686
 687    LLVMDisposeBuilder(builder);
 688
 689
 690    /* Verify the LLVM IR.  If invalid, dump and abort */
 691 #ifdef DEBUG
 692    if(LLVMVerifyFunction(function, LLVMPrintMessageAction)) {
 693       if (1)
 694          lp_debug_dump_value(function);
 695       abort();
 696    }
 697 #endif
 698
 699    /* Apply optimizations to LLVM IR */
 700    LLVMRunFunctionPassManager(screen->pass, function);
 701
 702    if (gallivm_debug & GALLIVM_DEBUG_IR) {
 703       /* Print the LLVM IR to stderr */
 704       lp_debug_dump_value(function);
 705       debug_printf("\n");
 706    }
 707
 708    /*
 709     * Translate the LLVM IR into machine code.
 710     */
 711    {
 712       void *f = LLVMGetPointerToGlobal(screen->engine, function);
 713
 714       variant->jit_function[partial_mask] = (lp_jit_frag_func)pointer_to_func(f);
 715
 716       if (gallivm_debug & GALLIVM_DEBUG_ASM) {
 717          lp_disassemble(f);
 718       }
 719       lp_func_delete_body(function);
 720    }
 721 }
 722
 723
 724 static void
 725 dump_fs_variant_key(const struct lp_fragment_shader_variant_key *key)
 726 {
 727    unsigned i;
 728
 729    debug_printf("fs variant %p:\n", (void *) key);
 730
 731    if (key->depth.enabled) {
 732       debug_printf("depth.format = %s\n", util_format_name(key->zsbuf_format));
 733       debug_printf("depth.func = %s\n", util_dump_func(key->depth.func, TRUE));
 734       debug_printf("depth.writemask = %u\n", key->depth.writemask);
 735    }
 736
 737    for (i = 0; i < 2; ++i) {
 738       if (key->stencil[i].enabled) {
 739          debug_printf("stencil[%u].func = %s\n", i, util_dump_func(key->stencil[i].func, TRUE));
 740          debug_printf("stencil[%u].fail_op = %s\n", i, util_dump_stencil_op(key->stencil[i].fail_op, TRUE));
 741          debug_printf("stencil[%u].zpass_op = %s\n", i, util_dump_stencil_op(key->stencil[i].zpass_op, TRUE));
 742          debug_printf("stencil[%u].zfail_op = %s\n", i, util_dump_stencil_op(key->stencil[i].zfail_op, TRUE));
 743          debug_printf("stencil[%u].valuemask = 0x%x\n", i, key->stencil[i].valuemask);
 744          debug_printf("stencil[%u].writemask = 0x%x\n", i, key->stencil[i].writemask);
 745       }
 746    }
 747
 748    if (key->alpha.enabled) {
 749       debug_printf("alpha.func = %s\n", util_dump_func(key->alpha.func, TRUE));
 750       debug_printf("alpha.ref_value = %f\n", key->alpha.ref_value);
 751    }
 752
 753    if (key->blend.logicop_enable) {
 754       debug_printf("blend.logicop_func = %s\n", util_dump_logicop(key->blend.logicop_func, TRUE));
 755    }
 756    else if (key->blend.rt[0].blend_enable) {
 757       debug_printf("blend.rgb_func = %s\n",   util_dump_blend_func  (key->blend.rt[0].rgb_func, TRUE));
 758       debug_printf("blend.rgb_src_factor = %s\n",   util_dump_blend_factor(key->blend.rt[0].rgb_src_factor, TRUE));
 759       debug_printf("blend.rgb_dst_factor = %s\n",   util_dump_blend_factor(key->blend.rt[0].rgb_dst_factor, TRUE));
 760       debug_printf("blend.alpha_func = %s\n",       util_dump_blend_func  (key->blend.rt[0].alpha_func, TRUE));
 761       debug_printf("blend.alpha_src_factor = %s\n", util_dump_blend_factor(key->blend.rt[0].alpha_src_factor, TRUE));
 762       debug_printf("blend.alpha_dst_factor = %s\n", util_dump_blend_factor(key->blend.rt[0].alpha_dst_factor, TRUE));
 763    }
 764    debug_printf("blend.colormask = 0x%x\n", key->blend.rt[0].colormask);
 765    for (i = 0; i < PIPE_MAX_SAMPLERS; ++i) {
 766       if (key->sampler[i].format) {
 767          debug_printf("sampler[%u] = \n", i);
 768          debug_printf("  .format = %s\n",
 769                       util_format_name(key->sampler[i].format));
 770          debug_printf("  .target = %s\n",
 771                       util_dump_tex_target(key->sampler[i].target, TRUE));
 772          debug_printf("  .pot = %u %u %u\n",
 773                       key->sampler[i].pot_width,
 774                       key->sampler[i].pot_height,
 775                       key->sampler[i].pot_depth);
 776          debug_printf("  .wrap = %s %s %s\n",
 777                       util_dump_tex_wrap(key->sampler[i].wrap_s, TRUE),
 778                       util_dump_tex_wrap(key->sampler[i].wrap_t, TRUE),
 779                       util_dump_tex_wrap(key->sampler[i].wrap_r, TRUE));
 780          debug_printf("  .min_img_filter = %s\n",
 781                       util_dump_tex_filter(key->sampler[i].min_img_filter, TRUE));
 782          debug_printf("  .min_mip_filter = %s\n",
 783                       util_dump_tex_mipfilter(key->sampler[i].min_mip_filter, TRUE));
 784          debug_printf("  .mag_img_filter = %s\n",
 785                       util_dump_tex_filter(key->sampler[i].mag_img_filter, TRUE));
 786          if (key->sampler[i].compare_mode != PIPE_TEX_COMPARE_NONE)
 787             debug_printf("  .compare_func = %s\n", util_dump_func(key->sampler[i].compare_func, TRUE));
 788          debug_printf("  .normalized_coords = %u\n", key->sampler[i].normalized_coords);
 789       }
 790    }
 791 }
 792
 793
 794
 795 static struct lp_fragment_shader_variant *
 796 generate_variant(struct llvmpipe_context *lp,
 797                  struct lp_fragment_shader *shader,
 798                  const struct lp_fragment_shader_variant_key *key)
 799 {
 800    struct lp_fragment_shader_variant *variant;
 801
 802    variant = CALLOC_STRUCT(lp_fragment_shader_variant);
 803    if(!variant)
 804       return NULL;
 805
 806    variant->shader = shader;
 807    variant->list_item_global.base = variant;
 808    variant->list_item_local.base = variant;
 809    variant->no = shader->variants_created++;
 810
 811    memcpy(&variant->key, key, sizeof *key);
 812
 813    if (gallivm_debug & GALLIVM_DEBUG_IR) {
 814       debug_printf("llvmpipe: Creating fragment shader #%u variant #%u:\n",
 815                    shader->no, variant->no);
 816       tgsi_dump(shader->base.tokens, 0);
 817       dump_fs_variant_key(key);
 818    }
 819
 820    generate_fragment(lp, shader, variant, RAST_WHOLE);
 821    generate_fragment(lp, shader, variant, RAST_EDGE_TEST);
 822
 823    /* TODO: most of these can be relaxed, in particular the colormask */
 824    variant->opaque =
 825          !key->blend.logicop_enable &&
 826          !key->blend.rt[0].blend_enable &&
 827          key->blend.rt[0].colormask == 0xf &&
 828          !key->stencil[0].enabled &&
 829          !key->alpha.enabled &&
 830          !key->depth.enabled &&
 831          !shader->info.uses_kill
 832          ? TRUE : FALSE;
 833
 834    return variant;
 835 }
 836
 837
 838 static void *
 839 llvmpipe_create_fs_state(struct pipe_context *pipe,
 840                          const struct pipe_shader_state *templ)
 841 {
 842    struct lp_fragment_shader *shader;
 843
 844    shader = CALLOC_STRUCT(lp_fragment_shader);
 845    if (!shader)
 846       return NULL;
 847
 848    shader->no = fs_no++;
 849    make_empty_list(&shader->variants);
 850
 851    /* get/save the summary info for this shader */
 852    tgsi_scan_shader(templ->tokens, &shader->info);
 853
 854    /* we need to keep a local copy of the tokens */
 855    shader->base.tokens = tgsi_dup_tokens(templ->tokens);
 856
 857    if (LP_DEBUG & DEBUG_TGSI) {
 858       unsigned attrib;
 859       debug_printf("llvmpipe: Create fragment shader #%u %p:\n", shader->no, (void *) shader);
 860       tgsi_dump(templ->tokens, 0);
 861       debug_printf("usage masks:\n");
 862       for (attrib = 0; attrib < shader->info.num_inputs; ++attrib) {
 863          unsigned usage_mask = shader->info.input_usage_mask[attrib];
 864          debug_printf("  IN[%u].%s%s%s%s\n",
 865                       attrib,
 866                       usage_mask & TGSI_WRITEMASK_X ? "x" : "",
 867                       usage_mask & TGSI_WRITEMASK_Y ? "y" : "",
 868                       usage_mask & TGSI_WRITEMASK_Z ? "z" : "",
 869                       usage_mask & TGSI_WRITEMASK_W ? "w" : "");
 870       }
 871       debug_printf("\n");
 872    }
 873
 874    return shader;
 875 }
 876
 877
 878 static void
 879 llvmpipe_bind_fs_state(struct pipe_context *pipe, void *fs)
 880 {
 881    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
 882
 883    if (llvmpipe->fs == fs)
 884       return;
 885
 886    draw_flush(llvmpipe->draw);
 887
 888    llvmpipe->fs = fs;
 889
 890    llvmpipe->dirty |= LP_NEW_FS;
 891 }
 892
 893 static void
 894 remove_shader_variant(struct llvmpipe_context *lp,
 895                       struct lp_fragment_shader_variant *variant)
 896 {
 897    struct llvmpipe_screen *screen = llvmpipe_screen(lp->pipe.screen);
 898    unsigned i;
 899
 900    if (gallivm_debug & GALLIVM_DEBUG_IR) {
 901       debug_printf("llvmpipe: del fs #%u var #%u v created #%u v cached #%u v total cached #%u\n",
 902                     variant->shader->no, variant->no, variant->shader->variants_created,
 903                     variant->shader->variants_cached, lp->nr_fs_variants);
 904    }
 905    for (i = 0; i < Elements(variant->function); i++) {
 906       if (variant->function[i]) {
 907          if (variant->jit_function[i])
 908             LLVMFreeMachineCodeForFunction(screen->engine,
 909                                            variant->function[i]);
 910          LLVMDeleteFunction(variant->function[i]);
 911       }
 912    }
 913    remove_from_list(&variant->list_item_local);
 914    variant->shader->variants_cached--;
 915    remove_from_list(&variant->list_item_global);
 916    lp->nr_fs_variants--;
 917    FREE(variant);
 918 }
 919
 920 static void
 921 llvmpipe_delete_fs_state(struct pipe_context *pipe, void *fs)
 922 {
 923    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
 924    struct pipe_fence_handle *fence = NULL;
 925    struct lp_fragment_shader *shader = fs;
 926    struct lp_fs_variant_list_item *li;
 927
 928    assert(fs != llvmpipe->fs);
 929    (void) llvmpipe;
 930
 931    /*
 932     * XXX: we need to flush the context until we have some sort of reference
 933     * counting in fragment shaders as they may still be binned
 934     * Flushing alone might not sufficient we need to wait on it too.
 935     */
 936
 937    llvmpipe_flush(pipe, 0, &fence);
 938
 939    if (fence) {
 940       pipe->screen->fence_finish(pipe->screen, fence, 0);
 941       pipe->screen->fence_reference(pipe->screen, &fence, NULL);
 942    }
 943
 944    li = first_elem(&shader->variants);
 945    while(!at_end(&shader->variants, li)) {
 946       struct lp_fs_variant_list_item *next = next_elem(li);
 947       remove_shader_variant(llvmpipe, li->base);
 948       li = next;
 949    }
 950
 951    assert(shader->variants_cached == 0);
 952    FREE((void *) shader->base.tokens);
 953    FREE(shader);
 954 }
 955
 956
 957
 958 static void
 959 llvmpipe_set_constant_buffer(struct pipe_context *pipe,
 960                              uint shader, uint index,
 961                              struct pipe_resource *constants)
 962 {
 963    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
 964    unsigned size = constants ? constants->width0 : 0;
 965    const void *data = constants ? llvmpipe_resource_data(constants) : NULL;
 966
 967    assert(shader < PIPE_SHADER_TYPES);
 968    assert(index < PIPE_MAX_CONSTANT_BUFFERS);
 969
 970    if(llvmpipe->constants[shader][index] == constants)
 971       return;
 972
 973    draw_flush(llvmpipe->draw);
 974
 975    /* note: reference counting */
 976    pipe_resource_reference(&llvmpipe->constants[shader][index], constants);
 977
 978    if(shader == PIPE_SHADER_VERTEX ||
 979       shader == PIPE_SHADER_GEOMETRY) {
 980       draw_set_mapped_constant_buffer(llvmpipe->draw, shader,
 981                                       index, data, size);
 982    }
 983
 984    llvmpipe->dirty |= LP_NEW_CONSTANTS;
 985 }
 986
 987
 988 /**
 989  * Return the blend factor equivalent to a destination alpha of one.
 990  */
 991 static INLINE unsigned
 992 force_dst_alpha_one(unsigned factor, boolean alpha)
 993 {
 994    switch(factor) {
 995    case PIPE_BLENDFACTOR_DST_ALPHA:
 996       return PIPE_BLENDFACTOR_ONE;
 997    case PIPE_BLENDFACTOR_INV_DST_ALPHA:
 998       return PIPE_BLENDFACTOR_ZERO;
 999    case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
1000       return PIPE_BLENDFACTOR_ZERO;
1001    }
1002
1003    if (alpha) {
1004       switch(factor) {
1005       case PIPE_BLENDFACTOR_DST_COLOR:
1006          return PIPE_BLENDFACTOR_ONE;
1007       case PIPE_BLENDFACTOR_INV_DST_COLOR:
1008          return PIPE_BLENDFACTOR_ZERO;
1009       }
1010    }
1011
1012    return factor;
1013 }
1014
1015
1016 /**
1017  * We need to generate several variants of the fragment pipeline to match
1018  * all the combinations of the contributing state atoms.
1019  *
1020  * TODO: there is actually no reason to tie this to context state -- the
1021  * generated code could be cached globally in the screen.
1022  */
1023 static void
1024 make_variant_key(struct llvmpipe_context *lp,
1025                  struct lp_fragment_shader *shader,
1026                  struct lp_fragment_shader_variant_key *key)
1027 {
1028    unsigned i;
1029
1030    memset(key, 0, sizeof *key);
1031
1032    if (lp->framebuffer.zsbuf) {
1033       if (lp->depth_stencil->depth.enabled) {
1034          key->zsbuf_format = lp->framebuffer.zsbuf->format;
1035          memcpy(&key->depth, &lp->depth_stencil->depth, sizeof key->depth);
1036       }
1037       if (lp->depth_stencil->stencil[0].enabled) {
1038          key->zsbuf_format = lp->framebuffer.zsbuf->format;
1039          memcpy(&key->stencil, &lp->depth_stencil->stencil, sizeof key->stencil);
1040       }
1041    }
1042
1043    key->alpha.enabled = lp->depth_stencil->alpha.enabled;
1044    if(key->alpha.enabled)
1045       key->alpha.func = lp->depth_stencil->alpha.func;
1046    /* alpha.ref_value is passed in jit_context */
1047
1048    key->flatshade = lp->rasterizer->flatshade;
1049    if (lp->active_query_count) {
1050       key->occlusion_count = TRUE;
1051    }
1052
1053    if (lp->framebuffer.nr_cbufs) {
1054       memcpy(&key->blend, lp->blend, sizeof key->blend);
1055    }
1056
1057    key->nr_cbufs = lp->framebuffer.nr_cbufs;
1058    for (i = 0; i < lp->framebuffer.nr_cbufs; i++) {
1059       struct pipe_rt_blend_state *blend_rt = &key->blend.rt[i];
1060       const struct util_format_description *format_desc;
1061       unsigned chan;
1062
1063       format_desc = util_format_description(lp->framebuffer.cbufs[i]->format);
1064       assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
1065              format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB);
1066
1067       blend_rt->colormask = lp->blend->rt[i].colormask;
1068
1069       /* mask out color channels not present in the color buffer.
1070        * Should be simple to incorporate per-cbuf writemasks:
1071        */
1072       for(chan = 0; chan < 4; ++chan) {
1073          enum util_format_swizzle swizzle = format_desc->swizzle[chan];
1074
1075          if(swizzle > UTIL_FORMAT_SWIZZLE_W)
1076             blend_rt->colormask &= ~(1 << chan);
1077       }
1078
1079       /*
1080        * Our swizzled render tiles always have an alpha channel, but the linear
1081        * render target format often does not, so force here the dst alpha to be
1082        * one.
1083        *
1084        * This is not a mere optimization. Wrong results will be produced if the
1085        * dst alpha is used, the dst format does not have alpha, and the previous
1086        * rendering was not flushed from the swizzled to linear buffer. For
1087        * example, NonPowTwo DCT.
1088        *
1089        * TODO: This should be generalized to all channels for better
1090        * performance, but only alpha causes correctness issues.
1091        */
1092       if (format_desc->swizzle[3] > UTIL_FORMAT_SWIZZLE_W) {
1093          blend_rt->rgb_src_factor = force_dst_alpha_one(blend_rt->rgb_src_factor, FALSE);
1094          blend_rt->rgb_dst_factor = force_dst_alpha_one(blend_rt->rgb_dst_factor, FALSE);
1095          blend_rt->alpha_src_factor = force_dst_alpha_one(blend_rt->alpha_src_factor, TRUE);
1096          blend_rt->alpha_dst_factor = force_dst_alpha_one(blend_rt->alpha_dst_factor, TRUE);
1097       }
1098    }
1099
1100    for(i = 0; i < PIPE_MAX_SAMPLERS; ++i)
1101       if(shader->info.file_mask[TGSI_FILE_SAMPLER] & (1 << i))
1102          lp_sampler_static_state(&key->sampler[i], lp->fragment_sampler_views[i], lp->sampler[i]);
1103 }
1104
1105 /**
1106  * Update fragment state.  This is called just prior to drawing
1107  * something when some fragment-related state has changed.
1108  */
1109 void
1110 llvmpipe_update_fs(struct llvmpipe_context *lp)
1111 {
1112    struct lp_fragment_shader *shader = lp->fs;
1113    struct lp_fragment_shader_variant_key key;
1114    struct lp_fragment_shader_variant *variant = NULL;
1115    struct lp_fs_variant_list_item *li;
1116
1117    make_variant_key(lp, shader, &key);
1118
1119    li = first_elem(&shader->variants);
1120    while(!at_end(&shader->variants, li)) {
1121       if(memcmp(&li->base->key, &key, sizeof key) == 0) {
1122          variant = li->base;
1123          break;
1124       }
1125       li = next_elem(li);
1126    }
1127
1128    if (variant) {
1129       move_to_head(&lp->fs_variants_list, &variant->list_item_global);
1130    }
1131    else {
1132       int64_t t0, t1;
1133       int64_t dt;
1134       unsigned i;
1135       if (lp->nr_fs_variants >= LP_MAX_SHADER_VARIANTS) {
1136          struct pipe_context *pipe = &lp->pipe;
1137          struct pipe_fence_handle *fence = NULL;
1138
1139          /*
1140           * XXX: we need to flush the context until we have some sort of reference
1141           * counting in fragment shaders as they may still be binned
1142           * Flushing alone might not be sufficient we need to wait on it too.
1143           */
1144          llvmpipe_flush(pipe, 0, &fence);
1145
1146          if (fence) {
1147             pipe->screen->fence_finish(pipe->screen, fence, 0);
1148             pipe->screen->fence_reference(pipe->screen, &fence, NULL);
1149          }
1150          for (i = 0; i < LP_MAX_SHADER_VARIANTS / 4; i++) {
1151             struct lp_fs_variant_list_item *item = last_elem(&lp->fs_variants_list);
1152             remove_shader_variant(lp, item->base);
1153          }
1154       }
1155       t0 = os_time_get();
1156
1157       variant = generate_variant(lp, shader, &key);
1158
1159       t1 = os_time_get();
1160       dt = t1 - t0;
1161       LP_COUNT_ADD(llvm_compile_time, dt);
1162       LP_COUNT_ADD(nr_llvm_compiles, 2);  /* emit vs. omit in/out test */
1163
1164       if (variant) {
1165          insert_at_head(&shader->variants, &variant->list_item_local);
1166          insert_at_head(&lp->fs_variants_list, &variant->list_item_global);
1167          lp->nr_fs_variants++;
1168          shader->variants_cached++;
1169       }
1170    }
1171
1172    lp_setup_set_fs_variant(lp->setup, variant);
1173 }
1174
1175
1176
1177 void
1178 llvmpipe_init_fs_funcs(struct llvmpipe_context *llvmpipe)
1179 {
1180    llvmpipe->pipe.create_fs_state = llvmpipe_create_fs_state;
1181    llvmpipe->pipe.bind_fs_state   = llvmpipe_bind_fs_state;
1182    llvmpipe->pipe.delete_fs_state = llvmpipe_delete_fs_state;
1183
1184    llvmpipe->pipe.set_constant_buffer = llvmpipe_set_constant_buffer;
1185 }