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 /**
 109  * Expand the relevent bits of mask_input to a 4-dword mask for the
 110  * four pixels in a 2x2 quad.  This will set the four elements of the
 111  * quad mask vector to 0 or ~0.
 112  *
 113  * \param quad  which quad of the quad group to test, in [0,3]
 114  * \param mask_input  bitwise mask for the whole 4x4 stamp
 115  */
 116 static LLVMValueRef
 117 generate_quad_mask(LLVMBuilderRef builder,
 118                    struct lp_type fs_type,
 119                    unsigned quad,
 120                    LLVMValueRef mask_input) /* int32 */
 121 {
 122    struct lp_type mask_type;
 123    LLVMTypeRef i32t = LLVMInt32Type();
 124    LLVMValueRef bits[4];
 125    LLVMValueRef mask;
 126    int shift;
 127
 128    /*
 129     * XXX: We'll need a different path for 16 x u8
 130     */
 131    assert(fs_type.width == 32);
 132    assert(fs_type.length == 4);
 133    mask_type = lp_int_type(fs_type);
 134
 135    /*
 136     * mask_input >>= (quad * 4)
 137     */
 138
 139    switch (quad) {
 140    case 0:
 141       shift = 0;
 142       break;
 143    case 1:
 144       shift = 2;
 145       break;
 146    case 2:
 147       shift = 8;
 148       break;
 149    case 3:
 150       shift = 10;
 151       break;
 152    default:
 153       assert(0);
 154       shift = 0;
 155    }
 156
 157    mask_input = LLVMBuildLShr(builder,
 158                               mask_input,
 159                               LLVMConstInt(i32t, shift, 0),
 160                               "");
 161
 162    /*
 163     * mask = { mask_input & (1 << i), for i in [0,3] }
 164     */
 165
 166    mask = lp_build_broadcast(builder, lp_build_vec_type(mask_type), mask_input);
 167
 168    bits[0] = LLVMConstInt(i32t, 1 << 0, 0);
 169    bits[1] = LLVMConstInt(i32t, 1 << 1, 0);
 170    bits[2] = LLVMConstInt(i32t, 1 << 4, 0);
 171    bits[3] = LLVMConstInt(i32t, 1 << 5, 0);
 172
 173    mask = LLVMBuildAnd(builder, mask, LLVMConstVector(bits, 4), "");
 174
 175    /*
 176     * mask = mask != 0 ? ~0 : 0
 177     */
 178
 179    mask = lp_build_compare(builder,
 180                            mask_type, PIPE_FUNC_NOTEQUAL,
 181                            mask,
 182                            lp_build_const_int_vec(mask_type, 0));
 183
 184    return mask;
 185 }
 186
 187
 188 #define EARLY_DEPTH_TEST  0x1
 189 #define LATE_DEPTH_TEST   0x2
 190 #define EARLY_DEPTH_WRITE 0x4
 191 #define LATE_DEPTH_WRITE  0x8
 192
 193 static int
 194 find_output_by_semantic( const struct tgsi_shader_info *info,
 195                          unsigned semantic,
 196                          unsigned index )
 197 {
 198    int i;
 199
 200    for (i = 0; i < info->num_outputs; i++)
 201       if (info->output_semantic_name[i] == semantic &&
 202           info->output_semantic_index[i] == index)
 203          return i;
 204
 205    return -1;
 206 }
 207
 208
 209 /**
 210  * Generate the fragment shader, depth/stencil test, and alpha tests.
 211  * \param i  which quad in the tile, in range [0,3]
 212  * \param partial_mask  if 1, do mask_input testing
 213  */
 214 static void
 215 generate_fs(struct llvmpipe_context *lp,
 216             struct lp_fragment_shader *shader,
 217             const struct lp_fragment_shader_variant_key *key,
 218             LLVMBuilderRef builder,
 219             struct lp_type type,
 220             LLVMValueRef context_ptr,
 221             unsigned i,
 222             struct lp_build_interp_soa_context *interp,
 223             struct lp_build_sampler_soa *sampler,
 224             LLVMValueRef *pmask,
 225             LLVMValueRef (*color)[4],
 226             LLVMValueRef depth_ptr,
 227             LLVMValueRef facing,
 228             unsigned partial_mask,
 229             LLVMValueRef mask_input,
 230             LLVMValueRef counter)
 231 {
 232    const struct util_format_description *zs_format_desc = NULL;
 233    const struct tgsi_token *tokens = shader->base.tokens;
 234    LLVMTypeRef vec_type;
 235    LLVMValueRef consts_ptr;
 236    LLVMValueRef outputs[PIPE_MAX_SHADER_OUTPUTS][NUM_CHANNELS];
 237    LLVMValueRef z;
 238    LLVMValueRef zs_value = NULL;
 239    LLVMValueRef stencil_refs[2];
 240    struct lp_build_flow_context *flow;
 241    struct lp_build_mask_context mask;
 242    boolean simple_shader = (shader->info.file_count[TGSI_FILE_SAMPLER] == 0 &&
 243                             shader->info.num_inputs < 3 &&
 244                             shader->info.num_instructions < 8);
 245    unsigned attrib;
 246    unsigned chan;
 247    unsigned cbuf;
 248    unsigned depth_mode;
 249
 250    if (key->depth.enabled ||
 251        key->stencil[0].enabled ||
 252        key->stencil[1].enabled) {
 253
 254       zs_format_desc = util_format_description(key->zsbuf_format);
 255       assert(zs_format_desc);
 256
 257       if (!shader->info.writes_z) {
 258          if (key->alpha.enabled || shader->info.uses_kill)
 259             /* With alpha test and kill, can do the depth test early
 260              * and hopefully eliminate some quads.  But need to do a
 261              * special deferred depth write once the final mask value
 262              * is known.
 263              */
 264             depth_mode = EARLY_DEPTH_TEST | LATE_DEPTH_WRITE;
 265          else
 266             depth_mode = EARLY_DEPTH_TEST | EARLY_DEPTH_WRITE;
 267       }
 268       else {
 269          depth_mode = LATE_DEPTH_TEST | LATE_DEPTH_WRITE;
 270       }
 271
 272       if (!(key->depth.enabled && key->depth.writemask) &&
 273           !(key->stencil[0].enabled && key->stencil[0].writemask))
 274          depth_mode &= ~(LATE_DEPTH_WRITE | EARLY_DEPTH_WRITE);
 275    }
 276    else {
 277       depth_mode = 0;
 278    }
 279
 280    assert(i < 4);
 281
 282    stencil_refs[0] = lp_jit_context_stencil_ref_front_value(builder, context_ptr);
 283    stencil_refs[1] = lp_jit_context_stencil_ref_back_value(builder, context_ptr);
 284
 285    vec_type = lp_build_vec_type(type);
 286
 287    consts_ptr = lp_jit_context_constants(builder, context_ptr);
 288
 289    flow = lp_build_flow_create(builder);
 290
 291    memset(outputs, 0, sizeof outputs);
 292
 293    /* Declare the color and z variables */
 294    for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++) {
 295       for(chan = 0; chan < NUM_CHANNELS; ++chan) {
 296          color[cbuf][chan] = lp_build_alloca(builder, vec_type, "color");
 297       }
 298    }
 299
 300    /* do triangle edge testing */
 301    if (partial_mask) {
 302       *pmask = generate_quad_mask(builder, type,
 303                                   i, mask_input);
 304    }
 305    else {
 306       *pmask = lp_build_const_int_vec(type, ~0);
 307    }
 308
 309    /* 'mask' will control execution based on quad's pixel alive/killed state */
 310    lp_build_mask_begin(&mask, flow, type, *pmask);
 311
 312    if (!(depth_mode & EARLY_DEPTH_TEST) && !simple_shader)
 313       lp_build_mask_check(&mask);
 314
 315    lp_build_interp_soa_update_pos(interp, i);
 316    z = interp->pos[2];
 317
 318    if (depth_mode & EARLY_DEPTH_TEST) {
 319       lp_build_depth_stencil_test(builder,
 320                                   &key->depth,
 321                                   key->stencil,
 322                                   type,
 323                                   zs_format_desc,
 324                                   &mask,
 325                                   stencil_refs,
 326                                   z,
 327                                   depth_ptr, facing,
 328                                   &zs_value,
 329                                   !simple_shader);
 330
 331       if (depth_mode & EARLY_DEPTH_WRITE)
 332          LLVMBuildStore(builder, zs_value, depth_ptr);
 333    }
 334
 335    lp_build_interp_soa_update_inputs(interp, i);
 336
 337    /* Build the actual shader */
 338    lp_build_tgsi_soa(builder, tokens, type, &mask,
 339                      consts_ptr, interp->pos, interp->inputs,
 340                      outputs, sampler, &shader->info);
 341
 342
 343    /* Alpha test */
 344    if (key->alpha.enabled) {
 345       int color0 = find_output_by_semantic(&shader->info,
 346                                            TGSI_SEMANTIC_COLOR,
 347                                            0);
 348
 349       if (color0 != -1) {
 350          LLVMValueRef alpha = LLVMBuildLoad(builder, outputs[color0][3], "alpha");
 351          LLVMValueRef alpha_ref_value;
 352
 353          alpha_ref_value = lp_jit_context_alpha_ref_value(builder, context_ptr);
 354          alpha_ref_value = lp_build_broadcast(builder, vec_type, alpha_ref_value);
 355
 356          lp_build_alpha_test(builder, key->alpha.func, type,
 357                              &mask, alpha, alpha_ref_value,
 358                              (depth_mode & LATE_DEPTH_TEST) != 0);
 359       }
 360    }
 361
 362    /* Late Z test */
 363    if (depth_mode & LATE_DEPTH_TEST) {
 364       int pos0 = find_output_by_semantic(&shader->info,
 365                                          TGSI_SEMANTIC_POSITION,
 366                                          0);
 367
 368       if (pos0 != -1) {
 369          z = LLVMBuildLoad(builder, outputs[pos0][2], "z");
 370          lp_build_name(z, "output%u.%u.%c", i, pos0, "xyzw"[chan]);
 371       }
 372
 373       lp_build_depth_stencil_test(builder,
 374                                   &key->depth,
 375                                   key->stencil,
 376                                   type,
 377                                   zs_format_desc,
 378                                   &mask,
 379                                   stencil_refs,
 380                                   z,
 381                                   depth_ptr, facing,
 382                                   &zs_value,
 383                                   !simple_shader);
 384       /* Late Z write */
 385       if (depth_mode & LATE_DEPTH_WRITE)
 386          LLVMBuildStore(builder, zs_value, depth_ptr);
 387    }
 388    else if ((depth_mode & EARLY_DEPTH_TEST) &&
 389             (depth_mode & LATE_DEPTH_WRITE))
 390    {
 391       /* Need to apply a reduced mask to the depth write.  Reload the
 392        * depth value, update from zs_value with the new mask value and
 393        * write that out.
 394        */
 395       lp_build_deferred_depth_write(builder,
 396                                     type,
 397                                     zs_format_desc,
 398                                     &mask,
 399                                     depth_ptr,
 400                                     zs_value);
 401    }
 402
 403
 404    /* Color write  */
 405    for (attrib = 0; attrib < shader->info.num_outputs; ++attrib)
 406    {
 407       if (shader->info.output_semantic_name[attrib] == TGSI_SEMANTIC_COLOR)
 408       {
 409          unsigned cbuf = shader->info.output_semantic_index[attrib];
 410          for(chan = 0; chan < NUM_CHANNELS; ++chan)
 411          {
 412             /* XXX: just initialize outputs to point at colors[] and
 413              * skip this.
 414              */
 415             LLVMValueRef out = LLVMBuildLoad(builder, outputs[attrib][chan], "");
 416             lp_build_name(out, "color%u.%u.%c", i, attrib, "rgba"[chan]);
 417             LLVMBuildStore(builder, out, color[cbuf][chan]);
 418          }
 419       }
 420    }
 421
 422    if (counter)
 423       lp_build_occlusion_count(builder, type,
 424                                lp_build_mask_value(&mask), counter);
 425
 426    *pmask = lp_build_mask_end(&mask);
 427
 428    lp_build_flow_destroy(flow);
 429 }
 430
 431
 432 /**
 433  * Generate color blending and color output.
 434  * \param rt  the render target index (to index blend, colormask state)
 435  * \param type  the pixel color type
 436  * \param context_ptr  pointer to the runtime JIT context
 437  * \param mask  execution mask (active fragment/pixel mask)
 438  * \param src  colors from the fragment shader
 439  * \param dst_ptr  the destination color buffer pointer
 440  */
 441 static void
 442 generate_blend(const struct pipe_blend_state *blend,
 443                unsigned rt,
 444                LLVMBuilderRef builder,
 445                struct lp_type type,
 446                LLVMValueRef context_ptr,
 447                LLVMValueRef mask,
 448                LLVMValueRef *src,
 449                LLVMValueRef dst_ptr,
 450                boolean do_branch)
 451 {
 452    struct lp_build_context bld;
 453    struct lp_build_flow_context *flow;
 454    struct lp_build_mask_context mask_ctx;
 455    LLVMTypeRef vec_type;
 456    LLVMValueRef const_ptr;
 457    LLVMValueRef con[4];
 458    LLVMValueRef dst[4];
 459    LLVMValueRef res[4];
 460    unsigned chan;
 461
 462    lp_build_context_init(&bld, builder, type);
 463
 464    flow = lp_build_flow_create(builder);
 465    lp_build_mask_begin(&mask_ctx, flow, type, mask);
 466    if (do_branch)
 467       lp_build_mask_check(&mask_ctx);
 468
 469    vec_type = lp_build_vec_type(type);
 470
 471    const_ptr = lp_jit_context_blend_color(builder, context_ptr);
 472    const_ptr = LLVMBuildBitCast(builder, const_ptr,
 473                                 LLVMPointerType(vec_type, 0), "");
 474
 475    /* load constant blend color and colors from the dest color buffer */
 476    for(chan = 0; chan < 4; ++chan) {
 477       LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), chan, 0);
 478       con[chan] = LLVMBuildLoad(builder, LLVMBuildGEP(builder, const_ptr, &index, 1, ""), "");
 479
 480       dst[chan] = LLVMBuildLoad(builder, LLVMBuildGEP(builder, dst_ptr, &index, 1, ""), "");
 481
 482       lp_build_name(con[chan], "con.%c", "rgba"[chan]);
 483       lp_build_name(dst[chan], "dst.%c", "rgba"[chan]);
 484    }
 485
 486    /* do blend */
 487    lp_build_blend_soa(builder, blend, type, rt, src, dst, con, res);
 488
 489    /* store results to color buffer */
 490    for(chan = 0; chan < 4; ++chan) {
 491       if(blend->rt[rt].colormask & (1 << chan)) {
 492          LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), chan, 0);
 493          lp_build_name(res[chan], "res.%c", "rgba"[chan]);
 494          res[chan] = lp_build_select(&bld, mask, res[chan], dst[chan]);
 495          LLVMBuildStore(builder, res[chan], LLVMBuildGEP(builder, dst_ptr, &index, 1, ""));
 496       }
 497    }
 498
 499    lp_build_mask_end(&mask_ctx);
 500    lp_build_flow_destroy(flow);
 501 }
 502
 503
 504 /**
 505  * Generate the runtime callable function for the whole fragment pipeline.
 506  * Note that the function which we generate operates on a block of 16
 507  * pixels at at time.  The block contains 2x2 quads.  Each quad contains
 508  * 2x2 pixels.
 509  */
 510 static void
 511 generate_fragment(struct llvmpipe_context *lp,
 512                   struct lp_fragment_shader *shader,
 513                   struct lp_fragment_shader_variant *variant,
 514                   unsigned partial_mask)
 515 {
 516    struct llvmpipe_screen *screen = llvmpipe_screen(lp->pipe.screen);
 517    const struct lp_fragment_shader_variant_key *key = &variant->key;
 518    char func_name[256];
 519    struct lp_type fs_type;
 520    struct lp_type blend_type;
 521    LLVMTypeRef fs_elem_type;
 522    LLVMTypeRef fs_int_vec_type;
 523    LLVMTypeRef blend_vec_type;
 524    LLVMTypeRef arg_types[11];
 525    LLVMTypeRef func_type;
 526    LLVMValueRef context_ptr;
 527    LLVMValueRef x;
 528    LLVMValueRef y;
 529    LLVMValueRef a0_ptr;
 530    LLVMValueRef dadx_ptr;
 531    LLVMValueRef dady_ptr;
 532    LLVMValueRef color_ptr_ptr;
 533    LLVMValueRef depth_ptr;
 534    LLVMValueRef mask_input;
 535    LLVMValueRef counter = NULL;
 536    LLVMBasicBlockRef block;
 537    LLVMBuilderRef builder;
 538    struct lp_build_sampler_soa *sampler;
 539    struct lp_build_interp_soa_context interp;
 540    LLVMValueRef fs_mask[LP_MAX_VECTOR_LENGTH];
 541    LLVMValueRef fs_out_color[PIPE_MAX_COLOR_BUFS][NUM_CHANNELS][LP_MAX_VECTOR_LENGTH];
 542    LLVMValueRef blend_mask;
 543    LLVMValueRef function;
 544    LLVMValueRef facing;
 545    unsigned num_fs;
 546    unsigned i;
 547    unsigned chan;
 548    unsigned cbuf;
 549
 550
 551    /* TODO: actually pick these based on the fs and color buffer
 552     * characteristics. */
 553
 554    memset(&fs_type, 0, sizeof fs_type);
 555    fs_type.floating = TRUE; /* floating point values */
 556    fs_type.sign = TRUE;     /* values are signed */
 557    fs_type.norm = FALSE;    /* values are not limited to [0,1] or [-1,1] */
 558    fs_type.width = 32;      /* 32-bit float */
 559    fs_type.length = 4;      /* 4 elements per vector */
 560    num_fs = 4;              /* number of quads per block */
 561
 562    memset(&blend_type, 0, sizeof blend_type);
 563    blend_type.floating = FALSE; /* values are integers */
 564    blend_type.sign = FALSE;     /* values are unsigned */
 565    blend_type.norm = TRUE;      /* values are in [0,1] or [-1,1] */
 566    blend_type.width = 8;        /* 8-bit ubyte values */
 567    blend_type.length = 16;      /* 16 elements per vector */
 568
 569    /*
 570     * Generate the function prototype. Any change here must be reflected in
 571     * lp_jit.h's lp_jit_frag_func function pointer type, and vice-versa.
 572     */
 573
 574    fs_elem_type = lp_build_elem_type(fs_type);
 575    fs_int_vec_type = lp_build_int_vec_type(fs_type);
 576
 577    blend_vec_type = lp_build_vec_type(blend_type);
 578
 579    util_snprintf(func_name, sizeof(func_name), "fs%u_variant%u_%s",
 580                  shader->no, variant->no, partial_mask ? "partial" : "whole");
 581
 582    arg_types[0] = screen->context_ptr_type;            /* context */
 583    arg_types[1] = LLVMInt32Type();                     /* x */
 584    arg_types[2] = LLVMInt32Type();                     /* y */
 585    arg_types[3] = LLVMFloatType();                     /* facing */
 586    arg_types[4] = LLVMPointerType(fs_elem_type, 0);    /* a0 */
 587    arg_types[5] = LLVMPointerType(fs_elem_type, 0);    /* dadx */
 588    arg_types[6] = LLVMPointerType(fs_elem_type, 0);    /* dady */
 589    arg_types[7] = LLVMPointerType(LLVMPointerType(blend_vec_type, 0), 0);  /* color */
 590    arg_types[8] = LLVMPointerType(fs_int_vec_type, 0); /* depth */
 591    arg_types[9] = LLVMInt32Type();                     /* mask_input */
 592    arg_types[10] = LLVMPointerType(LLVMInt32Type(), 0);/* counter */
 593
 594    func_type = LLVMFunctionType(LLVMVoidType(), arg_types, Elements(arg_types), 0);
 595
 596    function = LLVMAddFunction(screen->module, func_name, func_type);
 597    LLVMSetFunctionCallConv(function, LLVMCCallConv);
 598
 599    variant->function[partial_mask] = function;
 600
 601
 602    /* XXX: need to propagate noalias down into color param now we are
 603     * passing a pointer-to-pointer?
 604     */
 605    for(i = 0; i < Elements(arg_types); ++i)
 606       if(LLVMGetTypeKind(arg_types[i]) == LLVMPointerTypeKind)
 607          LLVMAddAttribute(LLVMGetParam(function, i), LLVMNoAliasAttribute);
 608
 609    context_ptr  = LLVMGetParam(function, 0);
 610    x            = LLVMGetParam(function, 1);
 611    y            = LLVMGetParam(function, 2);
 612    facing       = LLVMGetParam(function, 3);
 613    a0_ptr       = LLVMGetParam(function, 4);
 614    dadx_ptr     = LLVMGetParam(function, 5);
 615    dady_ptr     = LLVMGetParam(function, 6);
 616    color_ptr_ptr = LLVMGetParam(function, 7);
 617    depth_ptr    = LLVMGetParam(function, 8);
 618    mask_input   = LLVMGetParam(function, 9);
 619
 620    lp_build_name(context_ptr, "context");
 621    lp_build_name(x, "x");
 622    lp_build_name(y, "y");
 623    lp_build_name(a0_ptr, "a0");
 624    lp_build_name(dadx_ptr, "dadx");
 625    lp_build_name(dady_ptr, "dady");
 626    lp_build_name(color_ptr_ptr, "color_ptr_ptr");
 627    lp_build_name(depth_ptr, "depth");
 628    lp_build_name(mask_input, "mask_input");
 629
 630    if (key->occlusion_count) {
 631       counter = LLVMGetParam(function, 10);
 632       lp_build_name(counter, "counter");
 633    }
 634
 635    /*
 636     * Function body
 637     */
 638
 639    block = LLVMAppendBasicBlock(function, "entry");
 640    builder = LLVMCreateBuilder();
 641    LLVMPositionBuilderAtEnd(builder, block);
 642
 643    /*
 644     * The shader input interpolation info is not explicitely baked in the
 645     * shader key, but everything it derives from (TGSI, and flatshade) is
 646     * already included in the shader key.
 647     */
 648    lp_build_interp_soa_init(&interp,
 649                             lp->num_inputs,
 650                             lp->inputs,
 651                             builder, fs_type,
 652                             a0_ptr, dadx_ptr, dady_ptr,
 653                             x, y);
 654
 655    /* code generated texture sampling */
 656    sampler = lp_llvm_sampler_soa_create(key->sampler, context_ptr);
 657
 658    /* loop over quads in the block */
 659    for(i = 0; i < num_fs; ++i) {
 660       LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
 661       LLVMValueRef out_color[PIPE_MAX_COLOR_BUFS][NUM_CHANNELS];
 662       LLVMValueRef depth_ptr_i;
 663
 664       depth_ptr_i = LLVMBuildGEP(builder, depth_ptr, &index, 1, "");
 665
 666       generate_fs(lp, shader, key,
 667                   builder,
 668                   fs_type,
 669                   context_ptr,
 670                   i,
 671                   &interp,
 672                   sampler,
 673                   &fs_mask[i], /* output */
 674                   out_color,
 675                   depth_ptr_i,
 676                   facing,
 677                   partial_mask,
 678                   mask_input,
 679                   counter);
 680
 681       for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++)
 682          for(chan = 0; chan < NUM_CHANNELS; ++chan)
 683             fs_out_color[cbuf][chan][i] = out_color[cbuf][chan];
 684    }
 685
 686    sampler->destroy(sampler);
 687
 688    /* Loop over color outputs / color buffers to do blending.
 689     */
 690    for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++) {
 691       LLVMValueRef color_ptr;
 692       LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), cbuf, 0);
 693       LLVMValueRef blend_in_color[NUM_CHANNELS];
 694       unsigned rt;
 695
 696       /*
 697        * Convert the fs's output color and mask to fit to the blending type.
 698        */
 699       for(chan = 0; chan < NUM_CHANNELS; ++chan) {
 700          LLVMValueRef fs_color_vals[LP_MAX_VECTOR_LENGTH];
 701
 702          for (i = 0; i < num_fs; i++) {
 703             fs_color_vals[i] =
 704                LLVMBuildLoad(builder, fs_out_color[cbuf][chan][i], "fs_color_vals");
 705          }
 706
 707          lp_build_conv(builder, fs_type, blend_type,
 708                        fs_color_vals,
 709                        num_fs,
 710                        &blend_in_color[chan], 1);
 711
 712          lp_build_name(blend_in_color[chan], "color%d.%c", cbuf, "rgba"[chan]);
 713       }
 714
 715       if (partial_mask || !variant->opaque) {
 716          lp_build_conv_mask(builder, fs_type, blend_type,
 717                             fs_mask, num_fs,
 718                             &blend_mask, 1);
 719       } else {
 720          blend_mask = lp_build_const_int_vec(blend_type, ~0);
 721       }
 722
 723       color_ptr = LLVMBuildLoad(builder,
 724                                 LLVMBuildGEP(builder, color_ptr_ptr, &index, 1, ""),
 725                                 "");
 726       lp_build_name(color_ptr, "color_ptr%d", cbuf);
 727
 728       /* which blend/colormask state to use */
 729       rt = key->blend.independent_blend_enable ? cbuf : 0;
 730
 731       /*
 732        * Blending.
 733        */
 734       {
 735          /* Could the 4x4 have been killed?
 736           */
 737          boolean do_branch = ((key->depth.enabled || key->stencil[0].enabled) &&
 738                               !key->alpha.enabled &&
 739                               !shader->info.uses_kill);
 740
 741          generate_blend(&key->blend,
 742                         rt,
 743                         builder,
 744                         blend_type,
 745                         context_ptr,
 746                         blend_mask,
 747                         blend_in_color,
 748                         color_ptr,
 749                         do_branch);
 750       }
 751    }
 752
 753 #ifdef PIPE_ARCH_X86
 754    /* Avoid corrupting the FPU stack on 32bit OSes. */
 755    lp_build_intrinsic(builder, "llvm.x86.mmx.emms", LLVMVoidType(), NULL, 0);
 756 #endif
 757
 758    LLVMBuildRetVoid(builder);
 759
 760    LLVMDisposeBuilder(builder);
 761
 762
 763    /* Verify the LLVM IR.  If invalid, dump and abort */
 764 #ifdef DEBUG
 765    if(LLVMVerifyFunction(function, LLVMPrintMessageAction)) {
 766       if (1)
 767          lp_debug_dump_value(function);
 768       abort();
 769    }
 770 #endif
 771
 772    /* Apply optimizations to LLVM IR */
 773    LLVMRunFunctionPassManager(screen->pass, function);
 774
 775    if ((gallivm_debug & GALLIVM_DEBUG_IR) || (LP_DEBUG & DEBUG_FS)) {
 776       /* Print the LLVM IR to stderr */
 777       lp_debug_dump_value(function);
 778       debug_printf("\n");
 779    }
 780
 781    /*
 782     * Translate the LLVM IR into machine code.
 783     */
 784    {
 785       void *f = LLVMGetPointerToGlobal(screen->engine, function);
 786
 787       variant->jit_function[partial_mask] = (lp_jit_frag_func)pointer_to_func(f);
 788
 789       if ((gallivm_debug & GALLIVM_DEBUG_ASM) || (LP_DEBUG & DEBUG_FS)) {
 790          lp_disassemble(f);
 791       }
 792       lp_func_delete_body(function);
 793    }
 794 }
 795
 796
 797 static void
 798 dump_fs_variant_key(const struct lp_fragment_shader_variant_key *key)
 799 {
 800    unsigned i;
 801
 802    debug_printf("fs variant %p:\n", (void *) key);
 803
 804    if (key->flatshade) {
 805       debug_printf("flatshade = 1\n");
 806    }
 807    for (i = 0; i < key->nr_cbufs; ++i) {
 808       debug_printf("cbuf_format[%u] = %s\n", i, util_format_name(key->cbuf_format[i]));
 809    }
 810    if (key->depth.enabled) {
 811       debug_printf("depth.format = %s\n", util_format_name(key->zsbuf_format));
 812       debug_printf("depth.func = %s\n", util_dump_func(key->depth.func, TRUE));
 813       debug_printf("depth.writemask = %u\n", key->depth.writemask);
 814    }
 815
 816    for (i = 0; i < 2; ++i) {
 817       if (key->stencil[i].enabled) {
 818          debug_printf("stencil[%u].func = %s\n", i, util_dump_func(key->stencil[i].func, TRUE));
 819          debug_printf("stencil[%u].fail_op = %s\n", i, util_dump_stencil_op(key->stencil[i].fail_op, TRUE));
 820          debug_printf("stencil[%u].zpass_op = %s\n", i, util_dump_stencil_op(key->stencil[i].zpass_op, TRUE));
 821          debug_printf("stencil[%u].zfail_op = %s\n", i, util_dump_stencil_op(key->stencil[i].zfail_op, TRUE));
 822          debug_printf("stencil[%u].valuemask = 0x%x\n", i, key->stencil[i].valuemask);
 823          debug_printf("stencil[%u].writemask = 0x%x\n", i, key->stencil[i].writemask);
 824       }
 825    }
 826
 827    if (key->alpha.enabled) {
 828       debug_printf("alpha.func = %s\n", util_dump_func(key->alpha.func, TRUE));
 829    }
 830
 831    if (key->occlusion_count) {
 832       debug_printf("occlusion_count = 1\n");
 833    }
 834
 835    if (key->blend.logicop_enable) {
 836       debug_printf("blend.logicop_func = %s\n", util_dump_logicop(key->blend.logicop_func, TRUE));
 837    }
 838    else if (key->blend.rt[0].blend_enable) {
 839       debug_printf("blend.rgb_func = %s\n",   util_dump_blend_func  (key->blend.rt[0].rgb_func, TRUE));
 840       debug_printf("blend.rgb_src_factor = %s\n",   util_dump_blend_factor(key->blend.rt[0].rgb_src_factor, TRUE));
 841       debug_printf("blend.rgb_dst_factor = %s\n",   util_dump_blend_factor(key->blend.rt[0].rgb_dst_factor, TRUE));
 842       debug_printf("blend.alpha_func = %s\n",       util_dump_blend_func  (key->blend.rt[0].alpha_func, TRUE));
 843       debug_printf("blend.alpha_src_factor = %s\n", util_dump_blend_factor(key->blend.rt[0].alpha_src_factor, TRUE));
 844       debug_printf("blend.alpha_dst_factor = %s\n", util_dump_blend_factor(key->blend.rt[0].alpha_dst_factor, TRUE));
 845    }
 846    debug_printf("blend.colormask = 0x%x\n", key->blend.rt[0].colormask);
 847    for (i = 0; i < key->nr_samplers; ++i) {
 848       debug_printf("sampler[%u] = \n", i);
 849       debug_printf("  .format = %s\n",
 850                    util_format_name(key->sampler[i].format));
 851       debug_printf("  .target = %s\n",
 852                    util_dump_tex_target(key->sampler[i].target, TRUE));
 853       debug_printf("  .pot = %u %u %u\n",
 854                    key->sampler[i].pot_width,
 855                    key->sampler[i].pot_height,
 856                    key->sampler[i].pot_depth);
 857       debug_printf("  .wrap = %s %s %s\n",
 858                    util_dump_tex_wrap(key->sampler[i].wrap_s, TRUE),
 859                    util_dump_tex_wrap(key->sampler[i].wrap_t, TRUE),
 860                    util_dump_tex_wrap(key->sampler[i].wrap_r, TRUE));
 861       debug_printf("  .min_img_filter = %s\n",
 862                    util_dump_tex_filter(key->sampler[i].min_img_filter, TRUE));
 863       debug_printf("  .min_mip_filter = %s\n",
 864                    util_dump_tex_mipfilter(key->sampler[i].min_mip_filter, TRUE));
 865       debug_printf("  .mag_img_filter = %s\n",
 866                    util_dump_tex_filter(key->sampler[i].mag_img_filter, TRUE));
 867       if (key->sampler[i].compare_mode != PIPE_TEX_COMPARE_NONE)
 868          debug_printf("  .compare_func = %s\n", util_dump_func(key->sampler[i].compare_func, TRUE));
 869       debug_printf("  .normalized_coords = %u\n", key->sampler[i].normalized_coords);
 870       debug_printf("  .min_max_lod_equal = %u\n", key->sampler[i].min_max_lod_equal);
 871       debug_printf("  .lod_bias_non_zero = %u\n", key->sampler[i].lod_bias_non_zero);
 872       debug_printf("  .apply_min_lod = %u\n", key->sampler[i].apply_min_lod);
 873       debug_printf("  .apply_max_lod = %u\n", key->sampler[i].apply_max_lod);
 874    }
 875 }
 876
 877
 878 void
 879 lp_debug_fs_variant(const struct lp_fragment_shader_variant *variant)
 880 {
 881    debug_printf("llvmpipe: Fragment shader #%u variant #%u:\n",
 882                 variant->shader->no, variant->no);
 883    tgsi_dump(variant->shader->base.tokens, 0);
 884    dump_fs_variant_key(&variant->key);
 885    debug_printf("variant->opaque = %u\n", variant->opaque);
 886    debug_printf("\n");
 887 }
 888
 889 static struct lp_fragment_shader_variant *
 890 generate_variant(struct llvmpipe_context *lp,
 891                  struct lp_fragment_shader *shader,
 892                  const struct lp_fragment_shader_variant_key *key)
 893 {
 894    struct lp_fragment_shader_variant *variant;
 895    boolean fullcolormask;
 896
 897    variant = CALLOC_STRUCT(lp_fragment_shader_variant);
 898    if(!variant)
 899       return NULL;
 900
 901    variant->shader = shader;
 902    variant->list_item_global.base = variant;
 903    variant->list_item_local.base = variant;
 904    variant->no = shader->variants_created++;
 905
 906    memcpy(&variant->key, key, shader->variant_key_size);
 907
 908    /*
 909     * Determine whether we are touching all channels in the color buffer.
 910     */
 911    fullcolormask = FALSE;
 912    if (key->nr_cbufs == 1) {
 913       const struct util_format_description *format_desc;
 914       format_desc = util_format_description(key->cbuf_format[0]);
 915       if ((~key->blend.rt[0].colormask &
 916            util_format_colormask(format_desc)) == 0) {
 917          fullcolormask = TRUE;
 918       }
 919    }
 920
 921    variant->opaque =
 922          !key->blend.logicop_enable &&
 923          !key->blend.rt[0].blend_enable &&
 924          fullcolormask &&
 925          !key->stencil[0].enabled &&
 926          !key->alpha.enabled &&
 927          !key->depth.enabled &&
 928          !shader->info.uses_kill
 929          ? TRUE : FALSE;
 930
 931
 932    if ((LP_DEBUG & DEBUG_FS) || (gallivm_debug & GALLIVM_DEBUG_IR)) {
 933       lp_debug_fs_variant(variant);
 934    }
 935
 936    generate_fragment(lp, shader, variant, RAST_EDGE_TEST);
 937
 938    if (variant->opaque) {
 939       /* Specialized shader, which doesn't need to read the color buffer. */
 940       generate_fragment(lp, shader, variant, RAST_WHOLE);
 941    } else {
 942       variant->jit_function[RAST_WHOLE] = variant->jit_function[RAST_EDGE_TEST];
 943    }
 944
 945    return variant;
 946 }
 947
 948
 949 static void *
 950 llvmpipe_create_fs_state(struct pipe_context *pipe,
 951                          const struct pipe_shader_state *templ)
 952 {
 953    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
 954    struct lp_fragment_shader *shader;
 955    int nr_samplers;
 956
 957    shader = CALLOC_STRUCT(lp_fragment_shader);
 958    if (!shader)
 959       return NULL;
 960
 961    shader->no = fs_no++;
 962    make_empty_list(&shader->variants);
 963
 964    /* get/save the summary info for this shader */
 965    tgsi_scan_shader(templ->tokens, &shader->info);
 966
 967    /* we need to keep a local copy of the tokens */
 968    shader->base.tokens = tgsi_dup_tokens(templ->tokens);
 969
 970    shader->draw_data = draw_create_fragment_shader(llvmpipe->draw, templ);
 971    if (shader->draw_data == NULL) {
 972       FREE((void *) shader->base.tokens);
 973       FREE(shader);
 974       return NULL;
 975    }
 976
 977    nr_samplers = shader->info.file_max[TGSI_FILE_SAMPLER] + 1;
 978
 979    shader->variant_key_size = Offset(struct lp_fragment_shader_variant_key,
 980                                      sampler[nr_samplers]);
 981
 982    if (LP_DEBUG & DEBUG_TGSI) {
 983       unsigned attrib;
 984       debug_printf("llvmpipe: Create fragment shader #%u %p:\n", shader->no, (void *) shader);
 985       tgsi_dump(templ->tokens, 0);
 986       debug_printf("usage masks:\n");
 987       for (attrib = 0; attrib < shader->info.num_inputs; ++attrib) {
 988          unsigned usage_mask = shader->info.input_usage_mask[attrib];
 989          debug_printf("  IN[%u].%s%s%s%s\n",
 990                       attrib,
 991                       usage_mask & TGSI_WRITEMASK_X ? "x" : "",
 992                       usage_mask & TGSI_WRITEMASK_Y ? "y" : "",
 993                       usage_mask & TGSI_WRITEMASK_Z ? "z" : "",
 994                       usage_mask & TGSI_WRITEMASK_W ? "w" : "");
 995       }
 996       debug_printf("\n");
 997    }
 998
 999    return shader;
1000 }
1001
1002
1003 static void
1004 llvmpipe_bind_fs_state(struct pipe_context *pipe, void *fs)
1005 {
1006    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
1007
1008    if (llvmpipe->fs == fs)
1009       return;
1010
1011    draw_flush(llvmpipe->draw);
1012
1013    draw_bind_fragment_shader(llvmpipe->draw,
1014                              (llvmpipe->fs ? llvmpipe->fs->draw_data : NULL));
1015
1016    llvmpipe->fs = fs;
1017
1018    llvmpipe->dirty |= LP_NEW_FS;
1019 }
1020
1021 static void
1022 remove_shader_variant(struct llvmpipe_context *lp,
1023                       struct lp_fragment_shader_variant *variant)
1024 {
1025    struct llvmpipe_screen *screen = llvmpipe_screen(lp->pipe.screen);
1026    unsigned i;
1027
1028    if (gallivm_debug & GALLIVM_DEBUG_IR) {
1029       debug_printf("llvmpipe: del fs #%u var #%u v created #%u v cached #%u v total cached #%u\n",
1030                     variant->shader->no, variant->no, variant->shader->variants_created,
1031                     variant->shader->variants_cached, lp->nr_fs_variants);
1032    }
1033    for (i = 0; i < Elements(variant->function); i++) {
1034       if (variant->function[i]) {
1035          if (variant->jit_function[i])
1036             LLVMFreeMachineCodeForFunction(screen->engine,
1037                                            variant->function[i]);
1038          LLVMDeleteFunction(variant->function[i]);
1039       }
1040    }
1041    remove_from_list(&variant->list_item_local);
1042    variant->shader->variants_cached--;
1043    remove_from_list(&variant->list_item_global);
1044    lp->nr_fs_variants--;
1045    FREE(variant);
1046 }
1047
1048 static void
1049 llvmpipe_delete_fs_state(struct pipe_context *pipe, void *fs)
1050 {
1051    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
1052    struct lp_fragment_shader *shader = fs;
1053    struct lp_fs_variant_list_item *li;
1054
1055    assert(fs != llvmpipe->fs);
1056    (void) llvmpipe;
1057
1058    /*
1059     * XXX: we need to flush the context until we have some sort of reference
1060     * counting in fragment shaders as they may still be binned
1061     * Flushing alone might not sufficient we need to wait on it too.
1062     */
1063
1064    llvmpipe_finish(pipe, __FUNCTION__);
1065
1066    li = first_elem(&shader->variants);
1067    while(!at_end(&shader->variants, li)) {
1068       struct lp_fs_variant_list_item *next = next_elem(li);
1069       remove_shader_variant(llvmpipe, li->base);
1070       li = next;
1071    }
1072
1073    draw_delete_fragment_shader(llvmpipe->draw, shader->draw_data);
1074
1075    assert(shader->variants_cached == 0);
1076    FREE((void *) shader->base.tokens);
1077    FREE(shader);
1078 }
1079
1080
1081
1082 static void
1083 llvmpipe_set_constant_buffer(struct pipe_context *pipe,
1084                              uint shader, uint index,
1085                              struct pipe_resource *constants)
1086 {
1087    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
1088    unsigned size = constants ? constants->width0 : 0;
1089    const void *data = constants ? llvmpipe_resource_data(constants) : NULL;
1090
1091    assert(shader < PIPE_SHADER_TYPES);
1092    assert(index < PIPE_MAX_CONSTANT_BUFFERS);
1093
1094    if(llvmpipe->constants[shader][index] == constants)
1095       return;
1096
1097    draw_flush(llvmpipe->draw);
1098
1099    /* note: reference counting */
1100    pipe_resource_reference(&llvmpipe->constants[shader][index], constants);
1101
1102    if(shader == PIPE_SHADER_VERTEX ||
1103       shader == PIPE_SHADER_GEOMETRY) {
1104       draw_set_mapped_constant_buffer(llvmpipe->draw, shader,
1105                                       index, data, size);
1106    }
1107
1108    llvmpipe->dirty |= LP_NEW_CONSTANTS;
1109 }
1110
1111
1112 /**
1113  * Return the blend factor equivalent to a destination alpha of one.
1114  */
1115 static INLINE unsigned
1116 force_dst_alpha_one(unsigned factor)
1117 {
1118    switch(factor) {
1119    case PIPE_BLENDFACTOR_DST_ALPHA:
1120       return PIPE_BLENDFACTOR_ONE;
1121    case PIPE_BLENDFACTOR_INV_DST_ALPHA:
1122       return PIPE_BLENDFACTOR_ZERO;
1123    case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
1124       return PIPE_BLENDFACTOR_ZERO;
1125    }
1126
1127    return factor;
1128 }
1129
1130
1131 /**
1132  * We need to generate several variants of the fragment pipeline to match
1133  * all the combinations of the contributing state atoms.
1134  *
1135  * TODO: there is actually no reason to tie this to context state -- the
1136  * generated code could be cached globally in the screen.
1137  */
1138 static void
1139 make_variant_key(struct llvmpipe_context *lp,
1140                  struct lp_fragment_shader *shader,
1141                  struct lp_fragment_shader_variant_key *key)
1142 {
1143    unsigned i;
1144
1145    memset(key, 0, shader->variant_key_size);
1146
1147    if (lp->framebuffer.zsbuf) {
1148       if (lp->depth_stencil->depth.enabled) {
1149          key->zsbuf_format = lp->framebuffer.zsbuf->format;
1150          memcpy(&key->depth, &lp->depth_stencil->depth, sizeof key->depth);
1151       }
1152       if (lp->depth_stencil->stencil[0].enabled) {
1153          key->zsbuf_format = lp->framebuffer.zsbuf->format;
1154          memcpy(&key->stencil, &lp->depth_stencil->stencil, sizeof key->stencil);
1155       }
1156    }
1157
1158    key->alpha.enabled = lp->depth_stencil->alpha.enabled;
1159    if(key->alpha.enabled)
1160       key->alpha.func = lp->depth_stencil->alpha.func;
1161    /* alpha.ref_value is passed in jit_context */
1162
1163    key->flatshade = lp->rasterizer->flatshade;
1164    if (lp->active_query_count) {
1165       key->occlusion_count = TRUE;
1166    }
1167
1168    if (lp->framebuffer.nr_cbufs) {
1169       memcpy(&key->blend, lp->blend, sizeof key->blend);
1170    }
1171
1172    key->nr_cbufs = lp->framebuffer.nr_cbufs;
1173    for (i = 0; i < lp->framebuffer.nr_cbufs; i++) {
1174       enum pipe_format format = lp->framebuffer.cbufs[i]->format;
1175       struct pipe_rt_blend_state *blend_rt = &key->blend.rt[i];
1176       const struct util_format_description *format_desc;
1177
1178       key->cbuf_format[i] = format;
1179
1180       format_desc = util_format_description(format);
1181       assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
1182              format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB);
1183
1184       blend_rt->colormask = lp->blend->rt[i].colormask;
1185
1186       /*
1187        * Mask out color channels not present in the color buffer.
1188        */
1189       blend_rt->colormask &= util_format_colormask(format_desc);
1190
1191       /*
1192        * Our swizzled render tiles always have an alpha channel, but the linear
1193        * render target format often does not, so force here the dst alpha to be
1194        * one.
1195        *
1196        * This is not a mere optimization. Wrong results will be produced if the
1197        * dst alpha is used, the dst format does not have alpha, and the previous
1198        * rendering was not flushed from the swizzled to linear buffer. For
1199        * example, NonPowTwo DCT.
1200        *
1201        * TODO: This should be generalized to all channels for better
1202        * performance, but only alpha causes correctness issues.
1203        *
1204        * Also, force rgb/alpha func/factors match, to make AoS blending easier.
1205        */
1206       if (format_desc->swizzle[3] > UTIL_FORMAT_SWIZZLE_W) {
1207          blend_rt->rgb_src_factor   = force_dst_alpha_one(blend_rt->rgb_src_factor);
1208          blend_rt->rgb_dst_factor   = force_dst_alpha_one(blend_rt->rgb_dst_factor);
1209          blend_rt->alpha_func       = blend_rt->rgb_func;
1210          blend_rt->alpha_src_factor = blend_rt->rgb_src_factor;
1211          blend_rt->alpha_dst_factor = blend_rt->rgb_dst_factor;
1212       }
1213    }
1214
1215    /* This value will be the same for all the variants of a given shader:
1216     */
1217    key->nr_samplers = shader->info.file_max[TGSI_FILE_SAMPLER] + 1;
1218
1219    for(i = 0; i < key->nr_samplers; ++i) {
1220       if(shader->info.file_mask[TGSI_FILE_SAMPLER] & (1 << i)) {
1221          lp_sampler_static_state(&key->sampler[i],
1222                                  lp->fragment_sampler_views[i],
1223                                  lp->sampler[i]);
1224       }
1225    }
1226 }
1227
1228 /**
1229  * Update fragment state.  This is called just prior to drawing
1230  * something when some fragment-related state has changed.
1231  */
1232 void
1233 llvmpipe_update_fs(struct llvmpipe_context *lp)
1234 {
1235    struct lp_fragment_shader *shader = lp->fs;
1236    struct lp_fragment_shader_variant_key key;
1237    struct lp_fragment_shader_variant *variant = NULL;
1238    struct lp_fs_variant_list_item *li;
1239
1240    make_variant_key(lp, shader, &key);
1241
1242    li = first_elem(&shader->variants);
1243    while(!at_end(&shader->variants, li)) {
1244       if(memcmp(&li->base->key, &key, shader->variant_key_size) == 0) {
1245          variant = li->base;
1246          break;
1247       }
1248       li = next_elem(li);
1249    }
1250
1251    if (variant) {
1252       move_to_head(&lp->fs_variants_list, &variant->list_item_global);
1253    }
1254    else {
1255       int64_t t0, t1;
1256       int64_t dt;
1257       unsigned i;
1258       if (lp->nr_fs_variants >= LP_MAX_SHADER_VARIANTS) {
1259          struct pipe_context *pipe = &lp->pipe;
1260
1261          /*
1262           * XXX: we need to flush the context until we have some sort of reference
1263           * counting in fragment shaders as they may still be binned
1264           * Flushing alone might not be sufficient we need to wait on it too.
1265           */
1266          llvmpipe_finish(pipe, __FUNCTION__);
1267
1268          for (i = 0; i < LP_MAX_SHADER_VARIANTS / 4; i++) {
1269             struct lp_fs_variant_list_item *item = last_elem(&lp->fs_variants_list);
1270             remove_shader_variant(lp, item->base);
1271          }
1272       }
1273       t0 = os_time_get();
1274
1275       variant = generate_variant(lp, shader, &key);
1276
1277       t1 = os_time_get();
1278       dt = t1 - t0;
1279       LP_COUNT_ADD(llvm_compile_time, dt);
1280       LP_COUNT_ADD(nr_llvm_compiles, 2);  /* emit vs. omit in/out test */
1281
1282       if (variant) {
1283          insert_at_head(&shader->variants, &variant->list_item_local);
1284          insert_at_head(&lp->fs_variants_list, &variant->list_item_global);
1285          lp->nr_fs_variants++;
1286          shader->variants_cached++;
1287       }
1288    }
1289
1290    lp_setup_set_fs_variant(lp->setup, variant);
1291 }
1292
1293
1294
1295 void
1296 llvmpipe_init_fs_funcs(struct llvmpipe_context *llvmpipe)
1297 {
1298    llvmpipe->pipe.create_fs_state = llvmpipe_create_fs_state;
1299    llvmpipe->pipe.bind_fs_state   = llvmpipe_bind_fs_state;
1300    llvmpipe->pipe.delete_fs_state = llvmpipe_delete_fs_state;
1301
1302    llvmpipe->pipe.set_constant_buffer = llvmpipe_set_constant_buffer;
1303 }