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                        boolean do_branch)
 121 {
 122    const struct util_format_description *format_desc;
 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    lp_build_depth_stencil_test(builder,
 131                                &key->depth,
 132                                key->stencil,
 133                                src_type,
 134                                format_desc,
 135                                mask,
 136                                stencil_refs,
 137                                src,
 138                                dst_ptr,
 139                                facing,
 140                                counter,
 141                                do_branch);
 142 }
 143
 144
 145 /**
 146  * Expand the relevent bits of mask_input to a 4-dword mask for the
 147  * four pixels in a 2x2 quad.  This will set the four elements of the
 148  * quad mask vector to 0 or ~0.
 149  *
 150  * \param quad  which quad of the quad group to test, in [0,3]
 151  * \param mask_input  bitwise mask for the whole 4x4 stamp
 152  */
 153 static LLVMValueRef
 154 generate_quad_mask(LLVMBuilderRef builder,
 155                    struct lp_type fs_type,
 156                    unsigned quad,
 157                    LLVMValueRef mask_input) /* int32 */
 158 {
 159    struct lp_type mask_type;
 160    LLVMTypeRef i32t = LLVMInt32Type();
 161    LLVMValueRef bits[4];
 162    LLVMValueRef mask;
 163    int shift;
 164
 165    /*
 166     * XXX: We'll need a different path for 16 x u8
 167     */
 168    assert(fs_type.width == 32);
 169    assert(fs_type.length == 4);
 170    mask_type = lp_int_type(fs_type);
 171
 172    /*
 173     * mask_input >>= (quad * 4)
 174     */
 175
 176    switch (quad) {
 177    case 0:
 178       shift = 0;
 179       break;
 180    case 1:
 181       shift = 2;
 182       break;
 183    case 2:
 184       shift = 8;
 185       break;
 186    case 3:
 187       shift = 10;
 188       break;
 189    default:
 190       assert(0);
 191       shift = 0;
 192    }
 193
 194    mask_input = LLVMBuildLShr(builder,
 195                               mask_input,
 196                               LLVMConstInt(i32t, shift, 0),
 197                               "");
 198
 199    /*
 200     * mask = { mask_input & (1 << i), for i in [0,3] }
 201     */
 202
 203    mask = lp_build_broadcast(builder, lp_build_vec_type(mask_type), mask_input);
 204
 205    bits[0] = LLVMConstInt(i32t, 1 << 0, 0);
 206    bits[1] = LLVMConstInt(i32t, 1 << 1, 0);
 207    bits[2] = LLVMConstInt(i32t, 1 << 4, 0);
 208    bits[3] = LLVMConstInt(i32t, 1 << 5, 0);
 209
 210    mask = LLVMBuildAnd(builder, mask, LLVMConstVector(bits, 4), "");
 211
 212    /*
 213     * mask = mask != 0 ? ~0 : 0
 214     */
 215
 216    mask = lp_build_compare(builder,
 217                            mask_type, PIPE_FUNC_NOTEQUAL,
 218                            mask,
 219                            lp_build_const_int_vec(mask_type, 0));
 220
 221    return mask;
 222 }
 223
 224
 225
 226 /**
 227  * Generate the fragment shader, depth/stencil test, and alpha tests.
 228  * \param i  which quad in the tile, in range [0,3]
 229  * \param partial_mask  if 1, do mask_input testing
 230  */
 231 static void
 232 generate_fs(struct llvmpipe_context *lp,
 233             struct lp_fragment_shader *shader,
 234             const struct lp_fragment_shader_variant_key *key,
 235             LLVMBuilderRef builder,
 236             struct lp_type type,
 237             LLVMValueRef context_ptr,
 238             unsigned i,
 239             struct lp_build_interp_soa_context *interp,
 240             struct lp_build_sampler_soa *sampler,
 241             LLVMValueRef *pmask,
 242             LLVMValueRef (*color)[4],
 243             LLVMValueRef depth_ptr,
 244             LLVMValueRef facing,
 245             unsigned partial_mask,
 246             LLVMValueRef mask_input,
 247             LLVMValueRef counter)
 248 {
 249    const struct tgsi_token *tokens = shader->base.tokens;
 250    LLVMTypeRef vec_type;
 251    LLVMValueRef consts_ptr;
 252    LLVMValueRef outputs[PIPE_MAX_SHADER_OUTPUTS][NUM_CHANNELS];
 253    LLVMValueRef z;
 254    LLVMValueRef stencil_refs[2];
 255    struct lp_build_flow_context *flow;
 256    struct lp_build_mask_context mask;
 257    boolean early_depth_stencil_test;
 258    boolean simple_shader = (shader->info.file_count[TGSI_FILE_SAMPLER] == 0 &&
 259                             shader->info.num_inputs < 3 &&
 260                             shader->info.num_instructions < 8);
 261    unsigned attrib;
 262    unsigned chan;
 263    unsigned cbuf;
 264
 265    assert(i < 4);
 266
 267    stencil_refs[0] = lp_jit_context_stencil_ref_front_value(builder, context_ptr);
 268    stencil_refs[1] = lp_jit_context_stencil_ref_back_value(builder, context_ptr);
 269
 270    vec_type = lp_build_vec_type(type);
 271
 272    consts_ptr = lp_jit_context_constants(builder, context_ptr);
 273
 274    flow = lp_build_flow_create(builder);
 275
 276    memset(outputs, 0, sizeof outputs);
 277
 278    lp_build_flow_scope_begin(flow);
 279
 280    /* Declare the color and z variables */
 281    for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++) {
 282       for(chan = 0; chan < NUM_CHANNELS; ++chan) {
 283          color[cbuf][chan] = lp_build_alloca(builder, vec_type, "color");
 284       }
 285    }
 286
 287    /* do triangle edge testing */
 288    if (partial_mask) {
 289       *pmask = generate_quad_mask(builder, type,
 290                                   i, mask_input);
 291    }
 292    else {
 293       *pmask = lp_build_const_int_vec(type, ~0);
 294    }
 295
 296
 297    early_depth_stencil_test =
 298       (key->depth.enabled || key->stencil[0].enabled) &&
 299       !key->alpha.enabled &&
 300       !shader->info.uses_kill &&
 301       !shader->info.writes_z;
 302
 303    /* 'mask' will control execution based on quad's pixel alive/killed state */
 304    lp_build_mask_begin(&mask, flow, type, *pmask);
 305
 306    if (!early_depth_stencil_test && !simple_shader)
 307       lp_build_mask_check(&mask);
 308
 309    lp_build_interp_soa_update_pos(interp, i);
 310    z = interp->pos[2];
 311
 312    if (early_depth_stencil_test)
 313       generate_depth_stencil(builder, key,
 314                              type, &mask,
 315                              stencil_refs,
 316                              z, depth_ptr,
 317                              facing, counter,
 318                              !simple_shader);
 319
 320    lp_build_interp_soa_update_inputs(interp, i);
 321
 322    lp_build_tgsi_soa(builder, tokens, type, &mask,
 323                      consts_ptr, interp->pos, interp->inputs,
 324                      outputs, sampler, &shader->info);
 325
 326    /* loop over fragment shader outputs/results */
 327    for (attrib = 0; attrib < shader->info.num_outputs; ++attrib) {
 328       for(chan = 0; chan < NUM_CHANNELS; ++chan) {
 329          if(outputs[attrib][chan]) {
 330             LLVMValueRef out = LLVMBuildLoad(builder, outputs[attrib][chan], "");
 331             lp_build_name(out, "output%u.%u.%c", i, attrib, "xyzw"[chan]);
 332
 333             switch (shader->info.output_semantic_name[attrib]) {
 334             case TGSI_SEMANTIC_COLOR:
 335                {
 336                   unsigned cbuf = shader->info.output_semantic_index[attrib];
 337
 338                   lp_build_name(out, "color%u.%u.%c", i, attrib, "rgba"[chan]);
 339
 340                   /* Alpha test */
 341                   /* XXX: should only test the final assignment to alpha */
 342                   if (cbuf == 0 && chan == 3 && key->alpha.enabled) {
 343                      LLVMValueRef alpha = out;
 344                      LLVMValueRef alpha_ref_value;
 345                      alpha_ref_value = lp_jit_context_alpha_ref_value(builder, context_ptr);
 346                      alpha_ref_value = lp_build_broadcast(builder, vec_type, alpha_ref_value);
 347                      lp_build_alpha_test(builder, key->alpha.func, type,
 348                                          &mask, alpha, alpha_ref_value, FALSE);
 349                   }
 350
 351                   LLVMBuildStore(builder, out, color[cbuf][chan]);
 352                   break;
 353                }
 354
 355             case TGSI_SEMANTIC_POSITION:
 356                if(chan == 2)
 357                   z = out;
 358                break;
 359             }
 360          }
 361       }
 362    }
 363
 364    if (!early_depth_stencil_test)
 365       generate_depth_stencil(builder, key,
 366                              type, &mask,
 367                              stencil_refs, z, depth_ptr,
 368                              facing, counter, FALSE);
 369
 370    lp_build_mask_end(&mask);
 371
 372    lp_build_flow_scope_end(flow);
 373
 374    lp_build_flow_destroy(flow);
 375
 376    *pmask = mask.value;
 377
 378 }
 379
 380
 381 /**
 382  * Generate color blending and color output.
 383  * \param rt  the render target index (to index blend, colormask state)
 384  * \param type  the pixel color type
 385  * \param context_ptr  pointer to the runtime JIT context
 386  * \param mask  execution mask (active fragment/pixel mask)
 387  * \param src  colors from the fragment shader
 388  * \param dst_ptr  the destination color buffer pointer
 389  */
 390 static void
 391 generate_blend(const struct pipe_blend_state *blend,
 392                unsigned rt,
 393                LLVMBuilderRef builder,
 394                struct lp_type type,
 395                LLVMValueRef context_ptr,
 396                LLVMValueRef mask,
 397                LLVMValueRef *src,
 398                LLVMValueRef dst_ptr,
 399                boolean do_branch)
 400 {
 401    struct lp_build_context bld;
 402    struct lp_build_flow_context *flow;
 403    struct lp_build_mask_context mask_ctx;
 404    LLVMTypeRef vec_type;
 405    LLVMValueRef const_ptr;
 406    LLVMValueRef con[4];
 407    LLVMValueRef dst[4];
 408    LLVMValueRef res[4];
 409    unsigned chan;
 410
 411    lp_build_context_init(&bld, builder, type);
 412
 413    flow = lp_build_flow_create(builder);
 414    lp_build_mask_begin(&mask_ctx, flow, type, mask);
 415    if (do_branch)
 416       lp_build_mask_check(&mask_ctx);
 417
 418    vec_type = lp_build_vec_type(type);
 419
 420    const_ptr = lp_jit_context_blend_color(builder, context_ptr);
 421    const_ptr = LLVMBuildBitCast(builder, const_ptr,
 422                                 LLVMPointerType(vec_type, 0), "");
 423
 424    /* load constant blend color and colors from the dest color buffer */
 425    for(chan = 0; chan < 4; ++chan) {
 426       LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), chan, 0);
 427       con[chan] = LLVMBuildLoad(builder, LLVMBuildGEP(builder, const_ptr, &index, 1, ""), "");
 428
 429       dst[chan] = LLVMBuildLoad(builder, LLVMBuildGEP(builder, dst_ptr, &index, 1, ""), "");
 430
 431       lp_build_name(con[chan], "con.%c", "rgba"[chan]);
 432       lp_build_name(dst[chan], "dst.%c", "rgba"[chan]);
 433    }
 434
 435    /* do blend */
 436    lp_build_blend_soa(builder, blend, type, rt, src, dst, con, res);
 437
 438    /* store results to color buffer */
 439    for(chan = 0; chan < 4; ++chan) {
 440       if(blend->rt[rt].colormask & (1 << chan)) {
 441          LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), chan, 0);
 442          lp_build_name(res[chan], "res.%c", "rgba"[chan]);
 443          res[chan] = lp_build_select(&bld, mask, res[chan], dst[chan]);
 444          LLVMBuildStore(builder, res[chan], LLVMBuildGEP(builder, dst_ptr, &index, 1, ""));
 445       }
 446    }
 447
 448    lp_build_mask_end(&mask_ctx);
 449    lp_build_flow_destroy(flow);
 450 }
 451
 452
 453 /**
 454  * Generate the runtime callable function for the whole fragment pipeline.
 455  * Note that the function which we generate operates on a block of 16
 456  * pixels at at time.  The block contains 2x2 quads.  Each quad contains
 457  * 2x2 pixels.
 458  */
 459 static void
 460 generate_fragment(struct llvmpipe_context *lp,
 461                   struct lp_fragment_shader *shader,
 462                   struct lp_fragment_shader_variant *variant,
 463                   unsigned partial_mask)
 464 {
 465    struct llvmpipe_screen *screen = llvmpipe_screen(lp->pipe.screen);
 466    const struct lp_fragment_shader_variant_key *key = &variant->key;
 467    char func_name[256];
 468    struct lp_type fs_type;
 469    struct lp_type blend_type;
 470    LLVMTypeRef fs_elem_type;
 471    LLVMTypeRef fs_int_vec_type;
 472    LLVMTypeRef blend_vec_type;
 473    LLVMTypeRef arg_types[11];
 474    LLVMTypeRef func_type;
 475    LLVMValueRef context_ptr;
 476    LLVMValueRef x;
 477    LLVMValueRef y;
 478    LLVMValueRef a0_ptr;
 479    LLVMValueRef dadx_ptr;
 480    LLVMValueRef dady_ptr;
 481    LLVMValueRef color_ptr_ptr;
 482    LLVMValueRef depth_ptr;
 483    LLVMValueRef mask_input;
 484    LLVMValueRef counter = NULL;
 485    LLVMBasicBlockRef block;
 486    LLVMBuilderRef builder;
 487    struct lp_build_sampler_soa *sampler;
 488    struct lp_build_interp_soa_context interp;
 489    LLVMValueRef fs_mask[LP_MAX_VECTOR_LENGTH];
 490    LLVMValueRef fs_out_color[PIPE_MAX_COLOR_BUFS][NUM_CHANNELS][LP_MAX_VECTOR_LENGTH];
 491    LLVMValueRef blend_mask;
 492    LLVMValueRef function;
 493    LLVMValueRef facing;
 494    unsigned num_fs;
 495    unsigned i;
 496    unsigned chan;
 497    unsigned cbuf;
 498
 499
 500    /* TODO: actually pick these based on the fs and color buffer
 501     * characteristics. */
 502
 503    memset(&fs_type, 0, sizeof fs_type);
 504    fs_type.floating = TRUE; /* floating point values */
 505    fs_type.sign = TRUE;     /* values are signed */
 506    fs_type.norm = FALSE;    /* values are not limited to [0,1] or [-1,1] */
 507    fs_type.width = 32;      /* 32-bit float */
 508    fs_type.length = 4;      /* 4 elements per vector */
 509    num_fs = 4;              /* number of quads per block */
 510
 511    memset(&blend_type, 0, sizeof blend_type);
 512    blend_type.floating = FALSE; /* values are integers */
 513    blend_type.sign = FALSE;     /* values are unsigned */
 514    blend_type.norm = TRUE;      /* values are in [0,1] or [-1,1] */
 515    blend_type.width = 8;        /* 8-bit ubyte values */
 516    blend_type.length = 16;      /* 16 elements per vector */
 517
 518    /*
 519     * Generate the function prototype. Any change here must be reflected in
 520     * lp_jit.h's lp_jit_frag_func function pointer type, and vice-versa.
 521     */
 522
 523    fs_elem_type = lp_build_elem_type(fs_type);
 524    fs_int_vec_type = lp_build_int_vec_type(fs_type);
 525
 526    blend_vec_type = lp_build_vec_type(blend_type);
 527
 528    util_snprintf(func_name, sizeof(func_name), "fs%u_variant%u_%s",
 529                  shader->no, variant->no, partial_mask ? "partial" : "whole");
 530
 531    arg_types[0] = screen->context_ptr_type;            /* context */
 532    arg_types[1] = LLVMInt32Type();                     /* x */
 533    arg_types[2] = LLVMInt32Type();                     /* y */
 534    arg_types[3] = LLVMFloatType();                     /* facing */
 535    arg_types[4] = LLVMPointerType(fs_elem_type, 0);    /* a0 */
 536    arg_types[5] = LLVMPointerType(fs_elem_type, 0);    /* dadx */
 537    arg_types[6] = LLVMPointerType(fs_elem_type, 0);    /* dady */
 538    arg_types[7] = LLVMPointerType(LLVMPointerType(blend_vec_type, 0), 0);  /* color */
 539    arg_types[8] = LLVMPointerType(fs_int_vec_type, 0); /* depth */
 540    arg_types[9] = LLVMInt32Type();                     /* mask_input */
 541    arg_types[10] = LLVMPointerType(LLVMInt32Type(), 0);/* counter */
 542
 543    func_type = LLVMFunctionType(LLVMVoidType(), arg_types, Elements(arg_types), 0);
 544
 545    function = LLVMAddFunction(screen->module, func_name, func_type);
 546    LLVMSetFunctionCallConv(function, LLVMCCallConv);
 547
 548    variant->function[partial_mask] = function;
 549
 550
 551    /* XXX: need to propagate noalias down into color param now we are
 552     * passing a pointer-to-pointer?
 553     */
 554    for(i = 0; i < Elements(arg_types); ++i)
 555       if(LLVMGetTypeKind(arg_types[i]) == LLVMPointerTypeKind)
 556          LLVMAddAttribute(LLVMGetParam(function, i), LLVMNoAliasAttribute);
 557
 558    context_ptr  = LLVMGetParam(function, 0);
 559    x            = LLVMGetParam(function, 1);
 560    y            = LLVMGetParam(function, 2);
 561    facing       = LLVMGetParam(function, 3);
 562    a0_ptr       = LLVMGetParam(function, 4);
 563    dadx_ptr     = LLVMGetParam(function, 5);
 564    dady_ptr     = LLVMGetParam(function, 6);
 565    color_ptr_ptr = LLVMGetParam(function, 7);
 566    depth_ptr    = LLVMGetParam(function, 8);
 567    mask_input   = LLVMGetParam(function, 9);
 568
 569    lp_build_name(context_ptr, "context");
 570    lp_build_name(x, "x");
 571    lp_build_name(y, "y");
 572    lp_build_name(a0_ptr, "a0");
 573    lp_build_name(dadx_ptr, "dadx");
 574    lp_build_name(dady_ptr, "dady");
 575    lp_build_name(color_ptr_ptr, "color_ptr_ptr");
 576    lp_build_name(depth_ptr, "depth");
 577    lp_build_name(mask_input, "mask_input");
 578
 579    if (key->occlusion_count) {
 580       counter = LLVMGetParam(function, 10);
 581       lp_build_name(counter, "counter");
 582    }
 583
 584    /*
 585     * Function body
 586     */
 587
 588    block = LLVMAppendBasicBlock(function, "entry");
 589    builder = LLVMCreateBuilder();
 590    LLVMPositionBuilderAtEnd(builder, block);
 591
 592    /*
 593     * The shader input interpolation info is not explicitely baked in the
 594     * shader key, but everything it derives from (TGSI, and flatshade) is
 595     * already included in the shader key.
 596     */
 597    lp_build_interp_soa_init(&interp,
 598                             lp->num_inputs,
 599                             lp->inputs,
 600                             builder, fs_type,
 601                             a0_ptr, dadx_ptr, dady_ptr,
 602                             x, y);
 603
 604    /* code generated texture sampling */
 605    sampler = lp_llvm_sampler_soa_create(key->sampler, context_ptr);
 606
 607    /* loop over quads in the block */
 608    for(i = 0; i < num_fs; ++i) {
 609       LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
 610       LLVMValueRef out_color[PIPE_MAX_COLOR_BUFS][NUM_CHANNELS];
 611       LLVMValueRef depth_ptr_i;
 612
 613       depth_ptr_i = LLVMBuildGEP(builder, depth_ptr, &index, 1, "");
 614
 615       generate_fs(lp, shader, key,
 616                   builder,
 617                   fs_type,
 618                   context_ptr,
 619                   i,
 620                   &interp,
 621                   sampler,
 622                   &fs_mask[i], /* output */
 623                   out_color,
 624                   depth_ptr_i,
 625                   facing,
 626                   partial_mask,
 627                   mask_input,
 628                   counter);
 629
 630       for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++)
 631          for(chan = 0; chan < NUM_CHANNELS; ++chan)
 632             fs_out_color[cbuf][chan][i] = out_color[cbuf][chan];
 633    }
 634
 635    sampler->destroy(sampler);
 636
 637    /* Loop over color outputs / color buffers to do blending.
 638     */
 639    for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++) {
 640       LLVMValueRef color_ptr;
 641       LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), cbuf, 0);
 642       LLVMValueRef blend_in_color[NUM_CHANNELS];
 643       unsigned rt;
 644
 645       /*
 646        * Convert the fs's output color and mask to fit to the blending type.
 647        */
 648       for(chan = 0; chan < NUM_CHANNELS; ++chan) {
 649          LLVMValueRef fs_color_vals[LP_MAX_VECTOR_LENGTH];
 650
 651          for (i = 0; i < num_fs; i++) {
 652             fs_color_vals[i] =
 653                LLVMBuildLoad(builder, fs_out_color[cbuf][chan][i], "fs_color_vals");
 654          }
 655
 656          lp_build_conv(builder, fs_type, blend_type,
 657                        fs_color_vals,
 658                        num_fs,
 659                        &blend_in_color[chan], 1);
 660
 661          lp_build_name(blend_in_color[chan], "color%d.%c", cbuf, "rgba"[chan]);
 662       }
 663
 664       if (partial_mask || !variant->opaque) {
 665          lp_build_conv_mask(builder, fs_type, blend_type,
 666                             fs_mask, num_fs,
 667                             &blend_mask, 1);
 668       } else {
 669          blend_mask = lp_build_const_int_vec(blend_type, ~0);
 670       }
 671
 672       color_ptr = LLVMBuildLoad(builder,
 673                                 LLVMBuildGEP(builder, color_ptr_ptr, &index, 1, ""),
 674                                 "");
 675       lp_build_name(color_ptr, "color_ptr%d", cbuf);
 676
 677       /* which blend/colormask state to use */
 678       rt = key->blend.independent_blend_enable ? cbuf : 0;
 679
 680       /*
 681        * Blending.
 682        */
 683       {
 684          /* Could the 4x4 have been killed?
 685           */
 686          boolean do_branch = ((key->depth.enabled || key->stencil[0].enabled) &&
 687                               !key->alpha.enabled &&
 688                               !shader->info.uses_kill);
 689
 690          generate_blend(&key->blend,
 691                         rt,
 692                         builder,
 693                         blend_type,
 694                         context_ptr,
 695                         blend_mask,
 696                         blend_in_color,
 697                         color_ptr,
 698                         do_branch);
 699       }
 700    }
 701
 702 #ifdef PIPE_ARCH_X86
 703    /* Avoid corrupting the FPU stack on 32bit OSes. */
 704    lp_build_intrinsic(builder, "llvm.x86.mmx.emms", LLVMVoidType(), NULL, 0);
 705 #endif
 706
 707    LLVMBuildRetVoid(builder);
 708
 709    LLVMDisposeBuilder(builder);
 710
 711
 712    /* Verify the LLVM IR.  If invalid, dump and abort */
 713 #ifdef DEBUG
 714    if(LLVMVerifyFunction(function, LLVMPrintMessageAction)) {
 715       if (1)
 716          lp_debug_dump_value(function);
 717       abort();
 718    }
 719 #endif
 720
 721    /* Apply optimizations to LLVM IR */
 722    LLVMRunFunctionPassManager(screen->pass, function);
 723
 724    if ((gallivm_debug & GALLIVM_DEBUG_IR) || (LP_DEBUG & DEBUG_FS)) {
 725       /* Print the LLVM IR to stderr */
 726       lp_debug_dump_value(function);
 727       debug_printf("\n");
 728    }
 729
 730    /*
 731     * Translate the LLVM IR into machine code.
 732     */
 733    {
 734       void *f = LLVMGetPointerToGlobal(screen->engine, function);
 735
 736       variant->jit_function[partial_mask] = (lp_jit_frag_func)pointer_to_func(f);
 737
 738       if ((gallivm_debug & GALLIVM_DEBUG_ASM) || (LP_DEBUG & DEBUG_FS)) {
 739          lp_disassemble(f);
 740       }
 741       lp_func_delete_body(function);
 742    }
 743 }
 744
 745
 746 static void
 747 dump_fs_variant_key(const struct lp_fragment_shader_variant_key *key)
 748 {
 749    unsigned i;
 750
 751    debug_printf("fs variant %p:\n", (void *) key);
 752
 753    if (key->flatshade) {
 754       debug_printf("flatshade = 1\n");
 755    }
 756    for (i = 0; i < key->nr_cbufs; ++i) {
 757       debug_printf("cbuf_format[%u] = %s\n", i, util_format_name(key->cbuf_format[i]));
 758    }
 759    if (key->depth.enabled) {
 760       debug_printf("depth.format = %s\n", util_format_name(key->zsbuf_format));
 761       debug_printf("depth.func = %s\n", util_dump_func(key->depth.func, TRUE));
 762       debug_printf("depth.writemask = %u\n", key->depth.writemask);
 763    }
 764
 765    for (i = 0; i < 2; ++i) {
 766       if (key->stencil[i].enabled) {
 767          debug_printf("stencil[%u].func = %s\n", i, util_dump_func(key->stencil[i].func, TRUE));
 768          debug_printf("stencil[%u].fail_op = %s\n", i, util_dump_stencil_op(key->stencil[i].fail_op, TRUE));
 769          debug_printf("stencil[%u].zpass_op = %s\n", i, util_dump_stencil_op(key->stencil[i].zpass_op, TRUE));
 770          debug_printf("stencil[%u].zfail_op = %s\n", i, util_dump_stencil_op(key->stencil[i].zfail_op, TRUE));
 771          debug_printf("stencil[%u].valuemask = 0x%x\n", i, key->stencil[i].valuemask);
 772          debug_printf("stencil[%u].writemask = 0x%x\n", i, key->stencil[i].writemask);
 773       }
 774    }
 775
 776    if (key->alpha.enabled) {
 777       debug_printf("alpha.func = %s\n", util_dump_func(key->alpha.func, TRUE));
 778    }
 779
 780    if (key->occlusion_count) {
 781       debug_printf("occlusion_count = 1\n");
 782    }
 783
 784    if (key->blend.logicop_enable) {
 785       debug_printf("blend.logicop_func = %s\n", util_dump_logicop(key->blend.logicop_func, TRUE));
 786    }
 787    else if (key->blend.rt[0].blend_enable) {
 788       debug_printf("blend.rgb_func = %s\n",   util_dump_blend_func  (key->blend.rt[0].rgb_func, TRUE));
 789       debug_printf("blend.rgb_src_factor = %s\n",   util_dump_blend_factor(key->blend.rt[0].rgb_src_factor, TRUE));
 790       debug_printf("blend.rgb_dst_factor = %s\n",   util_dump_blend_factor(key->blend.rt[0].rgb_dst_factor, TRUE));
 791       debug_printf("blend.alpha_func = %s\n",       util_dump_blend_func  (key->blend.rt[0].alpha_func, TRUE));
 792       debug_printf("blend.alpha_src_factor = %s\n", util_dump_blend_factor(key->blend.rt[0].alpha_src_factor, TRUE));
 793       debug_printf("blend.alpha_dst_factor = %s\n", util_dump_blend_factor(key->blend.rt[0].alpha_dst_factor, TRUE));
 794    }
 795    debug_printf("blend.colormask = 0x%x\n", key->blend.rt[0].colormask);
 796    for (i = 0; i < key->nr_samplers; ++i) {
 797       debug_printf("sampler[%u] = \n", i);
 798       debug_printf("  .format = %s\n",
 799                    util_format_name(key->sampler[i].format));
 800       debug_printf("  .target = %s\n",
 801                    util_dump_tex_target(key->sampler[i].target, TRUE));
 802       debug_printf("  .pot = %u %u %u\n",
 803                    key->sampler[i].pot_width,
 804                    key->sampler[i].pot_height,
 805                    key->sampler[i].pot_depth);
 806       debug_printf("  .wrap = %s %s %s\n",
 807                    util_dump_tex_wrap(key->sampler[i].wrap_s, TRUE),
 808                    util_dump_tex_wrap(key->sampler[i].wrap_t, TRUE),
 809                    util_dump_tex_wrap(key->sampler[i].wrap_r, TRUE));
 810       debug_printf("  .min_img_filter = %s\n",
 811                    util_dump_tex_filter(key->sampler[i].min_img_filter, TRUE));
 812       debug_printf("  .min_mip_filter = %s\n",
 813                    util_dump_tex_mipfilter(key->sampler[i].min_mip_filter, TRUE));
 814       debug_printf("  .mag_img_filter = %s\n",
 815                    util_dump_tex_filter(key->sampler[i].mag_img_filter, TRUE));
 816       if (key->sampler[i].compare_mode != PIPE_TEX_COMPARE_NONE)
 817          debug_printf("  .compare_func = %s\n", util_dump_func(key->sampler[i].compare_func, TRUE));
 818       debug_printf("  .normalized_coords = %u\n", key->sampler[i].normalized_coords);
 819       debug_printf("  .min_max_lod_equal = %u\n", key->sampler[i].min_max_lod_equal);
 820       debug_printf("  .lod_bias_non_zero = %u\n", key->sampler[i].lod_bias_non_zero);
 821       debug_printf("  .apply_min_lod = %u\n", key->sampler[i].apply_min_lod);
 822       debug_printf("  .apply_max_lod = %u\n", key->sampler[i].apply_max_lod);
 823    }
 824 }
 825
 826
 827 void
 828 lp_debug_fs_variant(const struct lp_fragment_shader_variant *variant)
 829 {
 830    debug_printf("llvmpipe: Fragment shader #%u variant #%u:\n",
 831                 variant->shader->no, variant->no);
 832    tgsi_dump(variant->shader->base.tokens, 0);
 833    dump_fs_variant_key(&variant->key);
 834    debug_printf("variant->opaque = %u\n", variant->opaque);
 835    debug_printf("\n");
 836 }
 837
 838 static struct lp_fragment_shader_variant *
 839 generate_variant(struct llvmpipe_context *lp,
 840                  struct lp_fragment_shader *shader,
 841                  const struct lp_fragment_shader_variant_key *key)
 842 {
 843    struct lp_fragment_shader_variant *variant;
 844    boolean fullcolormask;
 845
 846    variant = CALLOC_STRUCT(lp_fragment_shader_variant);
 847    if(!variant)
 848       return NULL;
 849
 850    variant->shader = shader;
 851    variant->list_item_global.base = variant;
 852    variant->list_item_local.base = variant;
 853    variant->no = shader->variants_created++;
 854
 855    memcpy(&variant->key, key, shader->variant_key_size);
 856
 857    /*
 858     * Determine whether we are touching all channels in the color buffer.
 859     */
 860    fullcolormask = FALSE;
 861    if (key->nr_cbufs == 1) {
 862       const struct util_format_description *format_desc;
 863       format_desc = util_format_description(key->cbuf_format[0]);
 864       if ((~key->blend.rt[0].colormask &
 865            util_format_colormask(format_desc)) == 0) {
 866          fullcolormask = TRUE;
 867       }
 868    }
 869
 870    variant->opaque =
 871          !key->blend.logicop_enable &&
 872          !key->blend.rt[0].blend_enable &&
 873          fullcolormask &&
 874          !key->stencil[0].enabled &&
 875          !key->alpha.enabled &&
 876          !key->depth.enabled &&
 877          !shader->info.uses_kill
 878          ? TRUE : FALSE;
 879
 880
 881    if ((LP_DEBUG & DEBUG_FS) || (gallivm_debug & GALLIVM_DEBUG_IR)) {
 882       lp_debug_fs_variant(variant);
 883    }
 884
 885    generate_fragment(lp, shader, variant, RAST_EDGE_TEST);
 886
 887    if (variant->opaque) {
 888       /* Specialized shader, which doesn't need to read the color buffer. */
 889       generate_fragment(lp, shader, variant, RAST_WHOLE);
 890    } else {
 891       variant->jit_function[RAST_WHOLE] = variant->jit_function[RAST_EDGE_TEST];
 892    }
 893
 894    return variant;
 895 }
 896
 897
 898 static void *
 899 llvmpipe_create_fs_state(struct pipe_context *pipe,
 900                          const struct pipe_shader_state *templ)
 901 {
 902    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
 903    struct lp_fragment_shader *shader;
 904    int nr_samplers;
 905
 906    shader = CALLOC_STRUCT(lp_fragment_shader);
 907    if (!shader)
 908       return NULL;
 909
 910    shader->no = fs_no++;
 911    make_empty_list(&shader->variants);
 912
 913    /* get/save the summary info for this shader */
 914    tgsi_scan_shader(templ->tokens, &shader->info);
 915
 916    /* we need to keep a local copy of the tokens */
 917    shader->base.tokens = tgsi_dup_tokens(templ->tokens);
 918
 919    shader->draw_data = draw_create_fragment_shader(llvmpipe->draw, templ);
 920    if (shader->draw_data == NULL) {
 921       FREE((void *) shader->base.tokens);
 922       FREE(shader);
 923       return NULL;
 924    }
 925
 926    nr_samplers = shader->info.file_max[TGSI_FILE_SAMPLER] + 1;
 927
 928    shader->variant_key_size = Offset(struct lp_fragment_shader_variant_key,
 929                                      sampler[nr_samplers]);
 930
 931    if (LP_DEBUG & DEBUG_TGSI) {
 932       unsigned attrib;
 933       debug_printf("llvmpipe: Create fragment shader #%u %p:\n", shader->no, (void *) shader);
 934       tgsi_dump(templ->tokens, 0);
 935       debug_printf("usage masks:\n");
 936       for (attrib = 0; attrib < shader->info.num_inputs; ++attrib) {
 937          unsigned usage_mask = shader->info.input_usage_mask[attrib];
 938          debug_printf("  IN[%u].%s%s%s%s\n",
 939                       attrib,
 940                       usage_mask & TGSI_WRITEMASK_X ? "x" : "",
 941                       usage_mask & TGSI_WRITEMASK_Y ? "y" : "",
 942                       usage_mask & TGSI_WRITEMASK_Z ? "z" : "",
 943                       usage_mask & TGSI_WRITEMASK_W ? "w" : "");
 944       }
 945       debug_printf("\n");
 946    }
 947
 948    return shader;
 949 }
 950
 951
 952 static void
 953 llvmpipe_bind_fs_state(struct pipe_context *pipe, void *fs)
 954 {
 955    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
 956
 957    if (llvmpipe->fs == fs)
 958       return;
 959
 960    draw_flush(llvmpipe->draw);
 961
 962    draw_bind_fragment_shader(llvmpipe->draw,
 963                              (llvmpipe->fs ? llvmpipe->fs->draw_data : NULL));
 964
 965    llvmpipe->fs = fs;
 966
 967    llvmpipe->dirty |= LP_NEW_FS;
 968 }
 969
 970 static void
 971 remove_shader_variant(struct llvmpipe_context *lp,
 972                       struct lp_fragment_shader_variant *variant)
 973 {
 974    struct llvmpipe_screen *screen = llvmpipe_screen(lp->pipe.screen);
 975    unsigned i;
 976
 977    if (gallivm_debug & GALLIVM_DEBUG_IR) {
 978       debug_printf("llvmpipe: del fs #%u var #%u v created #%u v cached #%u v total cached #%u\n",
 979                     variant->shader->no, variant->no, variant->shader->variants_created,
 980                     variant->shader->variants_cached, lp->nr_fs_variants);
 981    }
 982    for (i = 0; i < Elements(variant->function); i++) {
 983       if (variant->function[i]) {
 984          if (variant->jit_function[i])
 985             LLVMFreeMachineCodeForFunction(screen->engine,
 986                                            variant->function[i]);
 987          LLVMDeleteFunction(variant->function[i]);
 988       }
 989    }
 990    remove_from_list(&variant->list_item_local);
 991    variant->shader->variants_cached--;
 992    remove_from_list(&variant->list_item_global);
 993    lp->nr_fs_variants--;
 994    FREE(variant);
 995 }
 996
 997 static void
 998 llvmpipe_delete_fs_state(struct pipe_context *pipe, void *fs)
 999 {
1000    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
1001    struct lp_fragment_shader *shader = fs;
1002    struct lp_fs_variant_list_item *li;
1003
1004    assert(fs != llvmpipe->fs);
1005    (void) llvmpipe;
1006
1007    /*
1008     * XXX: we need to flush the context until we have some sort of reference
1009     * counting in fragment shaders as they may still be binned
1010     * Flushing alone might not sufficient we need to wait on it too.
1011     */
1012
1013    llvmpipe_finish(pipe, __FUNCTION__);
1014
1015    li = first_elem(&shader->variants);
1016    while(!at_end(&shader->variants, li)) {
1017       struct lp_fs_variant_list_item *next = next_elem(li);
1018       remove_shader_variant(llvmpipe, li->base);
1019       li = next;
1020    }
1021
1022    draw_delete_fragment_shader(llvmpipe->draw, shader->draw_data);
1023
1024    assert(shader->variants_cached == 0);
1025    FREE((void *) shader->base.tokens);
1026    FREE(shader);
1027 }
1028
1029
1030
1031 static void
1032 llvmpipe_set_constant_buffer(struct pipe_context *pipe,
1033                              uint shader, uint index,
1034                              struct pipe_resource *constants)
1035 {
1036    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
1037    unsigned size = constants ? constants->width0 : 0;
1038    const void *data = constants ? llvmpipe_resource_data(constants) : NULL;
1039
1040    assert(shader < PIPE_SHADER_TYPES);
1041    assert(index < PIPE_MAX_CONSTANT_BUFFERS);
1042
1043    if(llvmpipe->constants[shader][index] == constants)
1044       return;
1045
1046    draw_flush(llvmpipe->draw);
1047
1048    /* note: reference counting */
1049    pipe_resource_reference(&llvmpipe->constants[shader][index], constants);
1050
1051    if(shader == PIPE_SHADER_VERTEX ||
1052       shader == PIPE_SHADER_GEOMETRY) {
1053       draw_set_mapped_constant_buffer(llvmpipe->draw, shader,
1054                                       index, data, size);
1055    }
1056
1057    llvmpipe->dirty |= LP_NEW_CONSTANTS;
1058 }
1059
1060
1061 /**
1062  * Return the blend factor equivalent to a destination alpha of one.
1063  */
1064 static INLINE unsigned
1065 force_dst_alpha_one(unsigned factor)
1066 {
1067    switch(factor) {
1068    case PIPE_BLENDFACTOR_DST_ALPHA:
1069       return PIPE_BLENDFACTOR_ONE;
1070    case PIPE_BLENDFACTOR_INV_DST_ALPHA:
1071       return PIPE_BLENDFACTOR_ZERO;
1072    case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
1073       return PIPE_BLENDFACTOR_ZERO;
1074    }
1075
1076    return factor;
1077 }
1078
1079
1080 /**
1081  * We need to generate several variants of the fragment pipeline to match
1082  * all the combinations of the contributing state atoms.
1083  *
1084  * TODO: there is actually no reason to tie this to context state -- the
1085  * generated code could be cached globally in the screen.
1086  */
1087 static void
1088 make_variant_key(struct llvmpipe_context *lp,
1089                  struct lp_fragment_shader *shader,
1090                  struct lp_fragment_shader_variant_key *key)
1091 {
1092    unsigned i;
1093
1094    memset(key, 0, shader->variant_key_size);
1095
1096    if (lp->framebuffer.zsbuf) {
1097       if (lp->depth_stencil->depth.enabled) {
1098          key->zsbuf_format = lp->framebuffer.zsbuf->format;
1099          memcpy(&key->depth, &lp->depth_stencil->depth, sizeof key->depth);
1100       }
1101       if (lp->depth_stencil->stencil[0].enabled) {
1102          key->zsbuf_format = lp->framebuffer.zsbuf->format;
1103          memcpy(&key->stencil, &lp->depth_stencil->stencil, sizeof key->stencil);
1104       }
1105    }
1106
1107    key->alpha.enabled = lp->depth_stencil->alpha.enabled;
1108    if(key->alpha.enabled)
1109       key->alpha.func = lp->depth_stencil->alpha.func;
1110    /* alpha.ref_value is passed in jit_context */
1111
1112    key->flatshade = lp->rasterizer->flatshade;
1113    if (lp->active_query_count) {
1114       key->occlusion_count = TRUE;
1115    }
1116
1117    if (lp->framebuffer.nr_cbufs) {
1118       memcpy(&key->blend, lp->blend, sizeof key->blend);
1119    }
1120
1121    key->nr_cbufs = lp->framebuffer.nr_cbufs;
1122    for (i = 0; i < lp->framebuffer.nr_cbufs; i++) {
1123       enum pipe_format format = lp->framebuffer.cbufs[i]->format;
1124       struct pipe_rt_blend_state *blend_rt = &key->blend.rt[i];
1125       const struct util_format_description *format_desc;
1126
1127       key->cbuf_format[i] = format;
1128
1129       format_desc = util_format_description(format);
1130       assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
1131              format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB);
1132
1133       blend_rt->colormask = lp->blend->rt[i].colormask;
1134
1135       /*
1136        * Mask out color channels not present in the color buffer.
1137        */
1138       blend_rt->colormask &= util_format_colormask(format_desc);
1139
1140       /*
1141        * Our swizzled render tiles always have an alpha channel, but the linear
1142        * render target format often does not, so force here the dst alpha to be
1143        * one.
1144        *
1145        * This is not a mere optimization. Wrong results will be produced if the
1146        * dst alpha is used, the dst format does not have alpha, and the previous
1147        * rendering was not flushed from the swizzled to linear buffer. For
1148        * example, NonPowTwo DCT.
1149        *
1150        * TODO: This should be generalized to all channels for better
1151        * performance, but only alpha causes correctness issues.
1152        *
1153        * Also, force rgb/alpha func/factors match, to make AoS blending easier.
1154        */
1155       if (format_desc->swizzle[3] > UTIL_FORMAT_SWIZZLE_W) {
1156          blend_rt->rgb_src_factor   = force_dst_alpha_one(blend_rt->rgb_src_factor);
1157          blend_rt->rgb_dst_factor   = force_dst_alpha_one(blend_rt->rgb_dst_factor);
1158          blend_rt->alpha_func       = blend_rt->rgb_func;
1159          blend_rt->alpha_src_factor = blend_rt->rgb_src_factor;
1160          blend_rt->alpha_dst_factor = blend_rt->rgb_dst_factor;
1161       }
1162    }
1163
1164    /* This value will be the same for all the variants of a given shader:
1165     */
1166    key->nr_samplers = shader->info.file_max[TGSI_FILE_SAMPLER] + 1;
1167
1168    for(i = 0; i < key->nr_samplers; ++i) {
1169       if(shader->info.file_mask[TGSI_FILE_SAMPLER] & (1 << i)) {
1170          lp_sampler_static_state(&key->sampler[i],
1171                                  lp->fragment_sampler_views[i],
1172                                  lp->sampler[i]);
1173       }
1174    }
1175 }
1176
1177 /**
1178  * Update fragment state.  This is called just prior to drawing
1179  * something when some fragment-related state has changed.
1180  */
1181 void
1182 llvmpipe_update_fs(struct llvmpipe_context *lp)
1183 {
1184    struct lp_fragment_shader *shader = lp->fs;
1185    struct lp_fragment_shader_variant_key key;
1186    struct lp_fragment_shader_variant *variant = NULL;
1187    struct lp_fs_variant_list_item *li;
1188
1189    make_variant_key(lp, shader, &key);
1190
1191    li = first_elem(&shader->variants);
1192    while(!at_end(&shader->variants, li)) {
1193       if(memcmp(&li->base->key, &key, shader->variant_key_size) == 0) {
1194          variant = li->base;
1195          break;
1196       }
1197       li = next_elem(li);
1198    }
1199
1200    if (variant) {
1201       move_to_head(&lp->fs_variants_list, &variant->list_item_global);
1202    }
1203    else {
1204       int64_t t0, t1;
1205       int64_t dt;
1206       unsigned i;
1207       if (lp->nr_fs_variants >= LP_MAX_SHADER_VARIANTS) {
1208          struct pipe_context *pipe = &lp->pipe;
1209
1210          /*
1211           * XXX: we need to flush the context until we have some sort of reference
1212           * counting in fragment shaders as they may still be binned
1213           * Flushing alone might not be sufficient we need to wait on it too.
1214           */
1215          llvmpipe_finish(pipe, __FUNCTION__);
1216
1217          for (i = 0; i < LP_MAX_SHADER_VARIANTS / 4; i++) {
1218             struct lp_fs_variant_list_item *item = last_elem(&lp->fs_variants_list);
1219             remove_shader_variant(lp, item->base);
1220          }
1221       }
1222       t0 = os_time_get();
1223
1224       variant = generate_variant(lp, shader, &key);
1225
1226       t1 = os_time_get();
1227       dt = t1 - t0;
1228       LP_COUNT_ADD(llvm_compile_time, dt);
1229       LP_COUNT_ADD(nr_llvm_compiles, 2);  /* emit vs. omit in/out test */
1230
1231       if (variant) {
1232          insert_at_head(&shader->variants, &variant->list_item_local);
1233          insert_at_head(&lp->fs_variants_list, &variant->list_item_global);
1234          lp->nr_fs_variants++;
1235          shader->variants_cached++;
1236       }
1237    }
1238
1239    lp_setup_set_fs_variant(lp->setup, variant);
1240 }
1241
1242
1243
1244 void
1245 llvmpipe_init_fs_funcs(struct llvmpipe_context *llvmpipe)
1246 {
1247    llvmpipe->pipe.create_fs_state = llvmpipe_create_fs_state;
1248    llvmpipe->pipe.bind_fs_state   = llvmpipe_bind_fs_state;
1249    llvmpipe->pipe.delete_fs_state = llvmpipe_delete_fs_state;
1250
1251    llvmpipe->pipe.set_constant_buffer = llvmpipe_set_constant_buffer;
1252 }