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_setup.h"
  94 #include "lp_state.h"
  95 #include "lp_tex_sample.h"
  96 #include "lp_flush.h"
  97 #include "lp_state_fs.h"
  98
  99
 100 #include <llvm-c/Analysis.h>
 101 #include <llvm-c/BitWriter.h>
 102
 103
 104 /** Fragment shader number (for debugging) */
 105 static unsigned fs_no = 0;
 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(struct gallivm_state *gallivm,
 118                    struct lp_type fs_type,
 119                    unsigned quad,
 120                    LLVMValueRef mask_input) /* int32 */
 121 {
 122    LLVMBuilderRef builder = gallivm->builder;
 123    struct lp_type mask_type;
 124    LLVMTypeRef i32t = LLVMInt32TypeInContext(gallivm->context);
 125    LLVMValueRef bits[4];
 126    LLVMValueRef mask;
 127    int shift;
 128
 129    /*
 130     * XXX: We'll need a different path for 16 x u8
 131     */
 132    assert(fs_type.width == 32);
 133    assert(fs_type.length == 4);
 134    mask_type = lp_int_type(fs_type);
 135
 136    /*
 137     * mask_input >>= (quad * 4)
 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    mask = lp_build_broadcast(gallivm,
 166                              lp_build_vec_type(gallivm, mask_type),
 167                              mask_input);
 168
 169    bits[0] = LLVMConstInt(i32t, 1 << 0, 0);
 170    bits[1] = LLVMConstInt(i32t, 1 << 1, 0);
 171    bits[2] = LLVMConstInt(i32t, 1 << 4, 0);
 172    bits[3] = LLVMConstInt(i32t, 1 << 5, 0);
 173
 174    mask = LLVMBuildAnd(builder, mask, LLVMConstVector(bits, 4), "");
 175
 176    /*
 177     * mask = mask != 0 ? ~0 : 0
 178     */
 179    mask = lp_build_compare(gallivm,
 180                            mask_type, PIPE_FUNC_NOTEQUAL,
 181                            mask,
 182                            lp_build_const_int_vec(gallivm, 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 gallivm_state *gallivm,
 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_mask_context mask;
 241    boolean simple_shader = (shader->info.base.file_count[TGSI_FILE_SAMPLER] == 0 &&
 242                             shader->info.base.num_inputs < 3 &&
 243                             shader->info.base.num_instructions < 8);
 244    unsigned attrib;
 245    unsigned chan;
 246    unsigned cbuf;
 247    unsigned depth_mode;
 248
 249    if (key->depth.enabled ||
 250        key->stencil[0].enabled ||
 251        key->stencil[1].enabled) {
 252
 253       zs_format_desc = util_format_description(key->zsbuf_format);
 254       assert(zs_format_desc);
 255
 256       if (!shader->info.base.writes_z) {
 257          if (key->alpha.enabled || shader->info.base.uses_kill)
 258             /* With alpha test and kill, can do the depth test early
 259              * and hopefully eliminate some quads.  But need to do a
 260              * special deferred depth write once the final mask value
 261              * is known.
 262              */
 263             depth_mode = EARLY_DEPTH_TEST | LATE_DEPTH_WRITE;
 264          else
 265             depth_mode = EARLY_DEPTH_TEST | EARLY_DEPTH_WRITE;
 266       }
 267       else {
 268          depth_mode = LATE_DEPTH_TEST | LATE_DEPTH_WRITE;
 269       }
 270
 271       if (!(key->depth.enabled && key->depth.writemask) &&
 272           !(key->stencil[0].enabled && key->stencil[0].writemask))
 273          depth_mode &= ~(LATE_DEPTH_WRITE | EARLY_DEPTH_WRITE);
 274    }
 275    else {
 276       depth_mode = 0;
 277    }
 278
 279    assert(i < 4);
 280
 281    stencil_refs[0] = lp_jit_context_stencil_ref_front_value(gallivm, context_ptr);
 282    stencil_refs[1] = lp_jit_context_stencil_ref_back_value(gallivm, context_ptr);
 283
 284    vec_type = lp_build_vec_type(gallivm, type);
 285
 286    consts_ptr = lp_jit_context_constants(gallivm, context_ptr);
 287
 288    memset(outputs, 0, sizeof outputs);
 289
 290    /* Declare the color and z variables */
 291    for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++) {
 292       for(chan = 0; chan < NUM_CHANNELS; ++chan) {
 293          color[cbuf][chan] = lp_build_alloca(gallivm, vec_type, "color");
 294       }
 295    }
 296
 297    /* do triangle edge testing */
 298    if (partial_mask) {
 299       *pmask = generate_quad_mask(gallivm, type,
 300                                   i, mask_input);
 301    }
 302    else {
 303       *pmask = lp_build_const_int_vec(gallivm, type, ~0);
 304    }
 305
 306    /* 'mask' will control execution based on quad's pixel alive/killed state */
 307    lp_build_mask_begin(&mask, gallivm, type, *pmask);
 308
 309    if (!(depth_mode & EARLY_DEPTH_TEST) && !simple_shader)
 310       lp_build_mask_check(&mask);
 311
 312    lp_build_interp_soa_update_pos(interp, gallivm, i);
 313    z = interp->pos[2];
 314
 315    if (depth_mode & EARLY_DEPTH_TEST) {
 316       lp_build_depth_stencil_test(gallivm,
 317                                   &key->depth,
 318                                   key->stencil,
 319                                   type,
 320                                   zs_format_desc,
 321                                   &mask,
 322                                   stencil_refs,
 323                                   z,
 324                                   depth_ptr, facing,
 325                                   &zs_value,
 326                                   !simple_shader);
 327
 328       if (depth_mode & EARLY_DEPTH_WRITE) {
 329          lp_build_depth_write(builder, zs_format_desc, depth_ptr, zs_value);
 330       }
 331    }
 332
 333    lp_build_interp_soa_update_inputs(interp, gallivm, i);
 334
 335    /* Build the actual shader */
 336    lp_build_tgsi_soa(gallivm, tokens, type, &mask,
 337                      consts_ptr, NULL, /* sys values array */
 338                      interp->pos, interp->inputs,
 339                      outputs, sampler, &shader->info.base);
 340
 341    /* Alpha test */
 342    if (key->alpha.enabled) {
 343       int color0 = find_output_by_semantic(&shader->info.base,
 344                                            TGSI_SEMANTIC_COLOR,
 345                                            0);
 346
 347       if (color0 != -1 && outputs[color0][3]) {
 348          LLVMValueRef alpha = LLVMBuildLoad(builder, outputs[color0][3], "alpha");
 349          LLVMValueRef alpha_ref_value;
 350
 351          alpha_ref_value = lp_jit_context_alpha_ref_value(gallivm, context_ptr);
 352          alpha_ref_value = lp_build_broadcast(gallivm, vec_type, alpha_ref_value);
 353
 354          lp_build_alpha_test(gallivm, key->alpha.func, type,
 355                              &mask, alpha, alpha_ref_value,
 356                              (depth_mode & LATE_DEPTH_TEST) != 0);
 357       }
 358    }
 359
 360    /* Late Z test */
 361    if (depth_mode & LATE_DEPTH_TEST) {
 362       int pos0 = find_output_by_semantic(&shader->info.base,
 363                                          TGSI_SEMANTIC_POSITION,
 364                                          0);
 365
 366       if (pos0 != -1 && outputs[pos0][2]) {
 367          z = LLVMBuildLoad(builder, outputs[pos0][2], "output.z");
 368       }
 369
 370       lp_build_depth_stencil_test(gallivm,
 371                                   &key->depth,
 372                                   key->stencil,
 373                                   type,
 374                                   zs_format_desc,
 375                                   &mask,
 376                                   stencil_refs,
 377                                   z,
 378                                   depth_ptr, facing,
 379                                   &zs_value,
 380                                   !simple_shader);
 381       /* Late Z write */
 382       if (depth_mode & LATE_DEPTH_WRITE) {
 383          lp_build_depth_write(builder, zs_format_desc, depth_ptr, zs_value);
 384       }
 385    }
 386    else if ((depth_mode & EARLY_DEPTH_TEST) &&
 387             (depth_mode & LATE_DEPTH_WRITE))
 388    {
 389       /* Need to apply a reduced mask to the depth write.  Reload the
 390        * depth value, update from zs_value with the new mask value and
 391        * write that out.
 392        */
 393       lp_build_deferred_depth_write(gallivm,
 394                                     type,
 395                                     zs_format_desc,
 396                                     &mask,
 397                                     depth_ptr,
 398                                     zs_value);
 399    }
 400
 401
 402    /* Color write  */
 403    for (attrib = 0; attrib < shader->info.base.num_outputs; ++attrib)
 404    {
 405       if (shader->info.base.output_semantic_name[attrib] == TGSI_SEMANTIC_COLOR &&
 406           shader->info.base.output_semantic_index[attrib] < key->nr_cbufs)
 407       {
 408          unsigned cbuf = shader->info.base.output_semantic_index[attrib];
 409          for(chan = 0; chan < NUM_CHANNELS; ++chan) {
 410             if(outputs[attrib][chan]) {
 411                /* XXX: just initialize outputs to point at colors[] and
 412                 * skip this.
 413                 */
 414                LLVMValueRef out = LLVMBuildLoad(builder, outputs[attrib][chan], "");
 415                lp_build_name(out, "color%u.%u.%c", i, attrib, "rgba"[chan]);
 416                LLVMBuildStore(builder, out, color[cbuf][chan]);
 417             }
 418          }
 419       }
 420    }
 421
 422    if (counter)
 423       lp_build_occlusion_count(gallivm, type,
 424                                lp_build_mask_value(&mask), counter);
 425
 426    *pmask = lp_build_mask_end(&mask);
 427 }
 428
 429
 430 /**
 431  * Generate color blending and color output.
 432  * \param rt  the render target index (to index blend, colormask state)
 433  * \param type  the pixel color type
 434  * \param context_ptr  pointer to the runtime JIT context
 435  * \param mask  execution mask (active fragment/pixel mask)
 436  * \param src  colors from the fragment shader
 437  * \param dst_ptr  the destination color buffer pointer
 438  */
 439 static void
 440 generate_blend(struct gallivm_state *gallivm,
 441                const struct pipe_blend_state *blend,
 442                unsigned rt,
 443                LLVMBuilderRef builder,
 444                struct lp_type type,
 445                LLVMValueRef context_ptr,
 446                LLVMValueRef mask,
 447                LLVMValueRef *src,
 448                LLVMValueRef dst_ptr,
 449                boolean do_branch)
 450 {
 451    struct lp_build_context bld;
 452    struct lp_build_mask_context mask_ctx;
 453    LLVMTypeRef vec_type;
 454    LLVMValueRef const_ptr;
 455    LLVMValueRef con[4];
 456    LLVMValueRef dst[4];
 457    LLVMValueRef res[4];
 458    unsigned chan;
 459
 460    lp_build_context_init(&bld, gallivm, type);
 461
 462    lp_build_mask_begin(&mask_ctx, gallivm, type, mask);
 463    if (do_branch)
 464       lp_build_mask_check(&mask_ctx);
 465
 466    vec_type = lp_build_vec_type(gallivm, type);
 467
 468    const_ptr = lp_jit_context_blend_color(gallivm, context_ptr);
 469    const_ptr = LLVMBuildBitCast(builder, const_ptr,
 470                                 LLVMPointerType(vec_type, 0), "");
 471
 472    /* load constant blend color and colors from the dest color buffer */
 473    for(chan = 0; chan < 4; ++chan) {
 474       LLVMValueRef index = lp_build_const_int32(gallivm, chan);
 475       con[chan] = LLVMBuildLoad(builder, LLVMBuildGEP(builder, const_ptr, &index, 1, ""), "");
 476
 477       dst[chan] = LLVMBuildLoad(builder, LLVMBuildGEP(builder, dst_ptr, &index, 1, ""), "");
 478
 479       lp_build_name(con[chan], "con.%c", "rgba"[chan]);
 480       lp_build_name(dst[chan], "dst.%c", "rgba"[chan]);
 481    }
 482
 483    /* do blend */
 484    lp_build_blend_soa(gallivm, blend, type, rt, src, dst, con, res);
 485
 486    /* store results to color buffer */
 487    for(chan = 0; chan < 4; ++chan) {
 488       if(blend->rt[rt].colormask & (1 << chan)) {
 489          LLVMValueRef index = lp_build_const_int32(gallivm, chan);
 490          lp_build_name(res[chan], "res.%c", "rgba"[chan]);
 491          res[chan] = lp_build_select(&bld, mask, res[chan], dst[chan]);
 492          LLVMBuildStore(builder, res[chan], LLVMBuildGEP(builder, dst_ptr, &index, 1, ""));
 493       }
 494    }
 495
 496    lp_build_mask_end(&mask_ctx);
 497 }
 498
 499
 500 /**
 501  * Generate the runtime callable function for the whole fragment pipeline.
 502  * Note that the function which we generate operates on a block of 16
 503  * pixels at at time.  The block contains 2x2 quads.  Each quad contains
 504  * 2x2 pixels.
 505  */
 506 static void
 507 generate_fragment(struct llvmpipe_context *lp,
 508                   struct lp_fragment_shader *shader,
 509                   struct lp_fragment_shader_variant *variant,
 510                   unsigned partial_mask)
 511 {
 512    struct gallivm_state *gallivm = lp->gallivm;
 513    const struct lp_fragment_shader_variant_key *key = &variant->key;
 514    struct lp_shader_input inputs[PIPE_MAX_SHADER_INPUTS];
 515    char func_name[256];
 516    struct lp_type fs_type;
 517    struct lp_type blend_type;
 518    LLVMTypeRef fs_elem_type;
 519    LLVMTypeRef fs_int_vec_type;
 520    LLVMTypeRef blend_vec_type;
 521    LLVMTypeRef arg_types[11];
 522    LLVMTypeRef func_type;
 523    LLVMTypeRef int32_type = LLVMInt32TypeInContext(gallivm->context);
 524    LLVMTypeRef int8_type = LLVMInt8TypeInContext(gallivm->context);
 525    LLVMValueRef context_ptr;
 526    LLVMValueRef x;
 527    LLVMValueRef y;
 528    LLVMValueRef a0_ptr;
 529    LLVMValueRef dadx_ptr;
 530    LLVMValueRef dady_ptr;
 531    LLVMValueRef color_ptr_ptr;
 532    LLVMValueRef depth_ptr;
 533    LLVMValueRef mask_input;
 534    LLVMValueRef counter = NULL;
 535    LLVMBasicBlockRef block;
 536    LLVMBuilderRef builder;
 537    struct lp_build_sampler_soa *sampler;
 538    struct lp_build_interp_soa_context interp;
 539    LLVMValueRef fs_mask[LP_MAX_VECTOR_LENGTH];
 540    LLVMValueRef fs_out_color[PIPE_MAX_COLOR_BUFS][NUM_CHANNELS][LP_MAX_VECTOR_LENGTH];
 541    LLVMValueRef blend_mask;
 542    LLVMValueRef function;
 543    LLVMValueRef facing;
 544    const struct util_format_description *zs_format_desc;
 545    unsigned num_fs;
 546    unsigned i;
 547    unsigned chan;
 548    unsigned cbuf;
 549
 550    /* Adjust color input interpolation according to flatshade state:
 551     */
 552    memcpy(inputs, shader->inputs, shader->info.base.num_inputs * sizeof inputs[0]);
 553    for (i = 0; i < shader->info.base.num_inputs; i++) {
 554       if (inputs[i].interp == LP_INTERP_COLOR) {
 555          if (key->flatshade)
 556             inputs[i].interp = LP_INTERP_CONSTANT;
 557          else
 558             inputs[i].interp = LP_INTERP_LINEAR;
 559       }
 560    }
 561
 562
 563    /* TODO: actually pick these based on the fs and color buffer
 564     * characteristics. */
 565
 566    memset(&fs_type, 0, sizeof fs_type);
 567    fs_type.floating = TRUE; /* floating point values */
 568    fs_type.sign = TRUE;     /* values are signed */
 569    fs_type.norm = FALSE;    /* values are not limited to [0,1] or [-1,1] */
 570    fs_type.width = 32;      /* 32-bit float */
 571    fs_type.length = 4;      /* 4 elements per vector */
 572    num_fs = 4;              /* number of quads per block */
 573
 574    memset(&blend_type, 0, sizeof blend_type);
 575    blend_type.floating = FALSE; /* values are integers */
 576    blend_type.sign = FALSE;     /* values are unsigned */
 577    blend_type.norm = TRUE;      /* values are in [0,1] or [-1,1] */
 578    blend_type.width = 8;        /* 8-bit ubyte values */
 579    blend_type.length = 16;      /* 16 elements per vector */
 580
 581    /*
 582     * Generate the function prototype. Any change here must be reflected in
 583     * lp_jit.h's lp_jit_frag_func function pointer type, and vice-versa.
 584     */
 585
 586    fs_elem_type = lp_build_elem_type(gallivm, fs_type);
 587    fs_int_vec_type = lp_build_int_vec_type(gallivm, fs_type);
 588
 589    blend_vec_type = lp_build_vec_type(gallivm, blend_type);
 590
 591    util_snprintf(func_name, sizeof(func_name), "fs%u_variant%u_%s",
 592                  shader->no, variant->no, partial_mask ? "partial" : "whole");
 593
 594    arg_types[0] = lp_jit_get_context_type(lp);         /* context */
 595    arg_types[1] = int32_type;                          /* x */
 596    arg_types[2] = int32_type;                          /* y */
 597    arg_types[3] = int32_type;                          /* facing */
 598    arg_types[4] = LLVMPointerType(fs_elem_type, 0);    /* a0 */
 599    arg_types[5] = LLVMPointerType(fs_elem_type, 0);    /* dadx */
 600    arg_types[6] = LLVMPointerType(fs_elem_type, 0);    /* dady */
 601    arg_types[7] = LLVMPointerType(LLVMPointerType(blend_vec_type, 0), 0);  /* color */
 602    arg_types[8] = LLVMPointerType(int8_type, 0);       /* depth */
 603    arg_types[9] = int32_type;                          /* mask_input */
 604    arg_types[10] = LLVMPointerType(int32_type, 0);     /* counter */
 605
 606    func_type = LLVMFunctionType(LLVMVoidTypeInContext(gallivm->context),
 607                                 arg_types, Elements(arg_types), 0);
 608
 609    function = LLVMAddFunction(gallivm->module, func_name, func_type);
 610    LLVMSetFunctionCallConv(function, LLVMCCallConv);
 611
 612    variant->function[partial_mask] = function;
 613
 614    /* XXX: need to propagate noalias down into color param now we are
 615     * passing a pointer-to-pointer?
 616     */
 617    for(i = 0; i < Elements(arg_types); ++i)
 618       if(LLVMGetTypeKind(arg_types[i]) == LLVMPointerTypeKind)
 619          LLVMAddAttribute(LLVMGetParam(function, i), LLVMNoAliasAttribute);
 620
 621    context_ptr  = LLVMGetParam(function, 0);
 622    x            = LLVMGetParam(function, 1);
 623    y            = LLVMGetParam(function, 2);
 624    facing       = LLVMGetParam(function, 3);
 625    a0_ptr       = LLVMGetParam(function, 4);
 626    dadx_ptr     = LLVMGetParam(function, 5);
 627    dady_ptr     = LLVMGetParam(function, 6);
 628    color_ptr_ptr = LLVMGetParam(function, 7);
 629    depth_ptr    = LLVMGetParam(function, 8);
 630    mask_input   = LLVMGetParam(function, 9);
 631
 632    lp_build_name(context_ptr, "context");
 633    lp_build_name(x, "x");
 634    lp_build_name(y, "y");
 635    lp_build_name(a0_ptr, "a0");
 636    lp_build_name(dadx_ptr, "dadx");
 637    lp_build_name(dady_ptr, "dady");
 638    lp_build_name(color_ptr_ptr, "color_ptr_ptr");
 639    lp_build_name(depth_ptr, "depth");
 640    lp_build_name(mask_input, "mask_input");
 641
 642    if (key->occlusion_count) {
 643       counter = LLVMGetParam(function, 10);
 644       lp_build_name(counter, "counter");
 645    }
 646
 647    /*
 648     * Function body
 649     */
 650
 651    block = LLVMAppendBasicBlockInContext(gallivm->context, function, "entry");
 652    builder = gallivm->builder;
 653    assert(builder);
 654    LLVMPositionBuilderAtEnd(builder, block);
 655
 656    /*
 657     * The shader input interpolation info is not explicitely baked in the
 658     * shader key, but everything it derives from (TGSI, and flatshade) is
 659     * already included in the shader key.
 660     */
 661    lp_build_interp_soa_init(&interp,
 662                             gallivm,
 663                             shader->info.base.num_inputs,
 664                             inputs,
 665                             builder, fs_type,
 666                             a0_ptr, dadx_ptr, dady_ptr,
 667                             x, y);
 668
 669    /* code generated texture sampling */
 670    sampler = lp_llvm_sampler_soa_create(key->sampler, context_ptr);
 671
 672    /* loop over quads in the block */
 673    zs_format_desc = util_format_description(key->zsbuf_format);
 674
 675    for(i = 0; i < num_fs; ++i) {
 676       LLVMValueRef depth_offset = LLVMConstInt(int32_type,
 677                                                i*fs_type.length*zs_format_desc->block.bits/8,
 678                                                0);
 679       LLVMValueRef out_color[PIPE_MAX_COLOR_BUFS][NUM_CHANNELS];
 680       LLVMValueRef depth_ptr_i;
 681
 682       depth_ptr_i = LLVMBuildGEP(builder, depth_ptr, &depth_offset, 1, "");
 683
 684       generate_fs(gallivm,
 685                   shader, key,
 686                   builder,
 687                   fs_type,
 688                   context_ptr,
 689                   i,
 690                   &interp,
 691                   sampler,
 692                   &fs_mask[i], /* output */
 693                   out_color,
 694                   depth_ptr_i,
 695                   facing,
 696                   partial_mask,
 697                   mask_input,
 698                   counter);
 699
 700       for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++)
 701          for(chan = 0; chan < NUM_CHANNELS; ++chan)
 702             fs_out_color[cbuf][chan][i] = out_color[cbuf][chan];
 703    }
 704
 705    sampler->destroy(sampler);
 706
 707    /* Loop over color outputs / color buffers to do blending.
 708     */
 709    for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++) {
 710       LLVMValueRef color_ptr;
 711       LLVMValueRef index = lp_build_const_int32(gallivm, cbuf);
 712       LLVMValueRef blend_in_color[NUM_CHANNELS];
 713       unsigned rt;
 714
 715       /*
 716        * Convert the fs's output color and mask to fit to the blending type.
 717        */
 718       for(chan = 0; chan < NUM_CHANNELS; ++chan) {
 719          LLVMValueRef fs_color_vals[LP_MAX_VECTOR_LENGTH];
 720
 721          for (i = 0; i < num_fs; i++) {
 722             fs_color_vals[i] =
 723                LLVMBuildLoad(builder, fs_out_color[cbuf][chan][i], "fs_color_vals");
 724          }
 725
 726          lp_build_conv(gallivm, fs_type, blend_type,
 727                        fs_color_vals,
 728                        num_fs,
 729                        &blend_in_color[chan], 1);
 730
 731          lp_build_name(blend_in_color[chan], "color%d.%c", cbuf, "rgba"[chan]);
 732       }
 733
 734       if (partial_mask || !variant->opaque) {
 735          lp_build_conv_mask(lp->gallivm, fs_type, blend_type,
 736                             fs_mask, num_fs,
 737                             &blend_mask, 1);
 738       } else {
 739          blend_mask = lp_build_const_int_vec(lp->gallivm, blend_type, ~0);
 740       }
 741
 742       color_ptr = LLVMBuildLoad(builder,
 743                                 LLVMBuildGEP(builder, color_ptr_ptr, &index, 1, ""),
 744                                 "");
 745       lp_build_name(color_ptr, "color_ptr%d", cbuf);
 746
 747       /* which blend/colormask state to use */
 748       rt = key->blend.independent_blend_enable ? cbuf : 0;
 749
 750       /*
 751        * Blending.
 752        */
 753       {
 754          /* Could the 4x4 have been killed?
 755           */
 756          boolean do_branch = ((key->depth.enabled || key->stencil[0].enabled) &&
 757                               !key->alpha.enabled &&
 758                               !shader->info.base.uses_kill);
 759
 760          generate_blend(lp->gallivm,
 761                         &key->blend,
 762                         rt,
 763                         builder,
 764                         blend_type,
 765                         context_ptr,
 766                         blend_mask,
 767                         blend_in_color,
 768                         color_ptr,
 769                         do_branch);
 770       }
 771    }
 772
 773    LLVMBuildRetVoid(builder);
 774
 775    /* Verify the LLVM IR.  If invalid, dump and abort */
 776 #ifdef DEBUG
 777    if(LLVMVerifyFunction(function, LLVMPrintMessageAction)) {
 778       if (1)
 779          lp_debug_dump_value(function);
 780       abort();
 781    }
 782 #endif
 783
 784    /* Apply optimizations to LLVM IR */
 785    LLVMRunFunctionPassManager(gallivm->passmgr, function);
 786
 787    if ((gallivm_debug & GALLIVM_DEBUG_IR) || (LP_DEBUG & DEBUG_FS)) {
 788       /* Print the LLVM IR to stderr */
 789       lp_debug_dump_value(function);
 790       debug_printf("\n");
 791    }
 792
 793    /* Dump byte code to a file */
 794    if (0) {
 795       LLVMWriteBitcodeToFile(gallivm->module, "llvmpipe.bc");
 796    }
 797
 798    /*
 799     * Translate the LLVM IR into machine code.
 800     */
 801    {
 802       void *f = LLVMGetPointerToGlobal(gallivm->engine, function);
 803
 804       variant->jit_function[partial_mask] = (lp_jit_frag_func)pointer_to_func(f);
 805
 806       if ((gallivm_debug & GALLIVM_DEBUG_ASM) || (LP_DEBUG & DEBUG_FS)) {
 807          lp_disassemble(f);
 808       }
 809       lp_func_delete_body(function);
 810    }
 811 }
 812
 813
 814 static void
 815 dump_fs_variant_key(const struct lp_fragment_shader_variant_key *key)
 816 {
 817    unsigned i;
 818
 819    debug_printf("fs variant %p:\n", (void *) key);
 820
 821    if (key->flatshade) {
 822       debug_printf("flatshade = 1\n");
 823    }
 824    for (i = 0; i < key->nr_cbufs; ++i) {
 825       debug_printf("cbuf_format[%u] = %s\n", i, util_format_name(key->cbuf_format[i]));
 826    }
 827    if (key->depth.enabled) {
 828       debug_printf("depth.format = %s\n", util_format_name(key->zsbuf_format));
 829       debug_printf("depth.func = %s\n", util_dump_func(key->depth.func, TRUE));
 830       debug_printf("depth.writemask = %u\n", key->depth.writemask);
 831    }
 832
 833    for (i = 0; i < 2; ++i) {
 834       if (key->stencil[i].enabled) {
 835          debug_printf("stencil[%u].func = %s\n", i, util_dump_func(key->stencil[i].func, TRUE));
 836          debug_printf("stencil[%u].fail_op = %s\n", i, util_dump_stencil_op(key->stencil[i].fail_op, TRUE));
 837          debug_printf("stencil[%u].zpass_op = %s\n", i, util_dump_stencil_op(key->stencil[i].zpass_op, TRUE));
 838          debug_printf("stencil[%u].zfail_op = %s\n", i, util_dump_stencil_op(key->stencil[i].zfail_op, TRUE));
 839          debug_printf("stencil[%u].valuemask = 0x%x\n", i, key->stencil[i].valuemask);
 840          debug_printf("stencil[%u].writemask = 0x%x\n", i, key->stencil[i].writemask);
 841       }
 842    }
 843
 844    if (key->alpha.enabled) {
 845       debug_printf("alpha.func = %s\n", util_dump_func(key->alpha.func, TRUE));
 846    }
 847
 848    if (key->occlusion_count) {
 849       debug_printf("occlusion_count = 1\n");
 850    }
 851
 852    if (key->blend.logicop_enable) {
 853       debug_printf("blend.logicop_func = %s\n", util_dump_logicop(key->blend.logicop_func, TRUE));
 854    }
 855    else if (key->blend.rt[0].blend_enable) {
 856       debug_printf("blend.rgb_func = %s\n",   util_dump_blend_func  (key->blend.rt[0].rgb_func, TRUE));
 857       debug_printf("blend.rgb_src_factor = %s\n",   util_dump_blend_factor(key->blend.rt[0].rgb_src_factor, TRUE));
 858       debug_printf("blend.rgb_dst_factor = %s\n",   util_dump_blend_factor(key->blend.rt[0].rgb_dst_factor, TRUE));
 859       debug_printf("blend.alpha_func = %s\n",       util_dump_blend_func  (key->blend.rt[0].alpha_func, TRUE));
 860       debug_printf("blend.alpha_src_factor = %s\n", util_dump_blend_factor(key->blend.rt[0].alpha_src_factor, TRUE));
 861       debug_printf("blend.alpha_dst_factor = %s\n", util_dump_blend_factor(key->blend.rt[0].alpha_dst_factor, TRUE));
 862    }
 863    debug_printf("blend.colormask = 0x%x\n", key->blend.rt[0].colormask);
 864    for (i = 0; i < key->nr_samplers; ++i) {
 865       debug_printf("sampler[%u] = \n", i);
 866       debug_printf("  .format = %s\n",
 867                    util_format_name(key->sampler[i].format));
 868       debug_printf("  .target = %s\n",
 869                    util_dump_tex_target(key->sampler[i].target, TRUE));
 870       debug_printf("  .pot = %u %u %u\n",
 871                    key->sampler[i].pot_width,
 872                    key->sampler[i].pot_height,
 873                    key->sampler[i].pot_depth);
 874       debug_printf("  .wrap = %s %s %s\n",
 875                    util_dump_tex_wrap(key->sampler[i].wrap_s, TRUE),
 876                    util_dump_tex_wrap(key->sampler[i].wrap_t, TRUE),
 877                    util_dump_tex_wrap(key->sampler[i].wrap_r, TRUE));
 878       debug_printf("  .min_img_filter = %s\n",
 879                    util_dump_tex_filter(key->sampler[i].min_img_filter, TRUE));
 880       debug_printf("  .min_mip_filter = %s\n",
 881                    util_dump_tex_mipfilter(key->sampler[i].min_mip_filter, TRUE));
 882       debug_printf("  .mag_img_filter = %s\n",
 883                    util_dump_tex_filter(key->sampler[i].mag_img_filter, TRUE));
 884       if (key->sampler[i].compare_mode != PIPE_TEX_COMPARE_NONE)
 885          debug_printf("  .compare_func = %s\n", util_dump_func(key->sampler[i].compare_func, TRUE));
 886       debug_printf("  .normalized_coords = %u\n", key->sampler[i].normalized_coords);
 887       debug_printf("  .min_max_lod_equal = %u\n", key->sampler[i].min_max_lod_equal);
 888       debug_printf("  .lod_bias_non_zero = %u\n", key->sampler[i].lod_bias_non_zero);
 889       debug_printf("  .apply_min_lod = %u\n", key->sampler[i].apply_min_lod);
 890       debug_printf("  .apply_max_lod = %u\n", key->sampler[i].apply_max_lod);
 891    }
 892 }
 893
 894
 895 void
 896 lp_debug_fs_variant(const struct lp_fragment_shader_variant *variant)
 897 {
 898    debug_printf("llvmpipe: Fragment shader #%u variant #%u:\n",
 899                 variant->shader->no, variant->no);
 900    tgsi_dump(variant->shader->base.tokens, 0);
 901    dump_fs_variant_key(&variant->key);
 902    debug_printf("variant->opaque = %u\n", variant->opaque);
 903    debug_printf("\n");
 904 }
 905
 906
 907 /**
 908  * Generate a new fragment shader variant from the shader code and
 909  * other state indicated by the key.
 910  */
 911 static struct lp_fragment_shader_variant *
 912 generate_variant(struct llvmpipe_context *lp,
 913                  struct lp_fragment_shader *shader,
 914                  const struct lp_fragment_shader_variant_key *key)
 915 {
 916    struct lp_fragment_shader_variant *variant;
 917    boolean fullcolormask;
 918
 919    variant = CALLOC_STRUCT(lp_fragment_shader_variant);
 920    if(!variant)
 921       return NULL;
 922
 923    variant->shader = shader;
 924    variant->list_item_global.base = variant;
 925    variant->list_item_local.base = variant;
 926    variant->no = shader->variants_created++;
 927
 928    memcpy(&variant->key, key, shader->variant_key_size);
 929
 930    /*
 931     * Determine whether we are touching all channels in the color buffer.
 932     */
 933    fullcolormask = FALSE;
 934    if (key->nr_cbufs == 1) {
 935       const struct util_format_description *format_desc;
 936       format_desc = util_format_description(key->cbuf_format[0]);
 937       if ((~key->blend.rt[0].colormask &
 938            util_format_colormask(format_desc)) == 0) {
 939          fullcolormask = TRUE;
 940       }
 941    }
 942
 943    variant->opaque =
 944          !key->blend.logicop_enable &&
 945          !key->blend.rt[0].blend_enable &&
 946          fullcolormask &&
 947          !key->stencil[0].enabled &&
 948          !key->alpha.enabled &&
 949          !key->depth.enabled &&
 950          !shader->info.base.uses_kill
 951          ? TRUE : FALSE;
 952
 953
 954    if ((LP_DEBUG & DEBUG_FS) || (gallivm_debug & GALLIVM_DEBUG_IR)) {
 955       lp_debug_fs_variant(variant);
 956    }
 957
 958    generate_fragment(lp, shader, variant, RAST_EDGE_TEST);
 959
 960    if (variant->opaque) {
 961       /* Specialized shader, which doesn't need to read the color buffer. */
 962       generate_fragment(lp, shader, variant, RAST_WHOLE);
 963    } else {
 964       variant->jit_function[RAST_WHOLE] = variant->jit_function[RAST_EDGE_TEST];
 965    }
 966
 967    return variant;
 968 }
 969
 970
 971 static void *
 972 llvmpipe_create_fs_state(struct pipe_context *pipe,
 973                          const struct pipe_shader_state *templ)
 974 {
 975    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
 976    struct lp_fragment_shader *shader;
 977    int nr_samplers;
 978    int i;
 979
 980    shader = CALLOC_STRUCT(lp_fragment_shader);
 981    if (!shader)
 982       return NULL;
 983
 984    shader->no = fs_no++;
 985    make_empty_list(&shader->variants);
 986
 987    /* get/save the summary info for this shader */
 988    lp_build_tgsi_info(templ->tokens, &shader->info);
 989
 990    /* we need to keep a local copy of the tokens */
 991    shader->base.tokens = tgsi_dup_tokens(templ->tokens);
 992
 993    shader->draw_data = draw_create_fragment_shader(llvmpipe->draw, templ);
 994    if (shader->draw_data == NULL) {
 995       FREE((void *) shader->base.tokens);
 996       FREE(shader);
 997       return NULL;
 998    }
 999
1000    nr_samplers = shader->info.base.file_max[TGSI_FILE_SAMPLER] + 1;
1001
1002    shader->variant_key_size = Offset(struct lp_fragment_shader_variant_key,
1003                                      sampler[nr_samplers]);
1004
1005    for (i = 0; i < shader->info.base.num_inputs; i++) {
1006       shader->inputs[i].usage_mask = shader->info.base.input_usage_mask[i];
1007
1008       switch (shader->info.base.input_interpolate[i]) {
1009       case TGSI_INTERPOLATE_CONSTANT:
1010          shader->inputs[i].interp = LP_INTERP_CONSTANT;
1011          break;
1012       case TGSI_INTERPOLATE_LINEAR:
1013          shader->inputs[i].interp = LP_INTERP_LINEAR;
1014          break;
1015       case TGSI_INTERPOLATE_PERSPECTIVE:
1016          shader->inputs[i].interp = LP_INTERP_PERSPECTIVE;
1017          break;
1018       default:
1019          assert(0);
1020          break;
1021       }
1022
1023       switch (shader->info.base.input_semantic_name[i]) {
1024       case TGSI_SEMANTIC_COLOR:
1025          /* Colors may be either linearly or constant interpolated in
1026           * the fragment shader, but that information isn't available
1027           * here.  Mark color inputs and fix them up later.
1028           */
1029          shader->inputs[i].interp = LP_INTERP_COLOR;
1030          break;
1031       case TGSI_SEMANTIC_FACE:
1032          shader->inputs[i].interp = LP_INTERP_FACING;
1033          break;
1034       case TGSI_SEMANTIC_POSITION:
1035          /* Position was already emitted above
1036           */
1037          shader->inputs[i].interp = LP_INTERP_POSITION;
1038          shader->inputs[i].src_index = 0;
1039          continue;
1040       }
1041
1042       shader->inputs[i].src_index = i+1;
1043    }
1044
1045    if (LP_DEBUG & DEBUG_TGSI) {
1046       unsigned attrib;
1047       debug_printf("llvmpipe: Create fragment shader #%u %p:\n",
1048                    shader->no, (void *) shader);
1049       tgsi_dump(templ->tokens, 0);
1050       debug_printf("usage masks:\n");
1051       for (attrib = 0; attrib < shader->info.base.num_inputs; ++attrib) {
1052          unsigned usage_mask = shader->info.base.input_usage_mask[attrib];
1053          debug_printf("  IN[%u].%s%s%s%s\n",
1054                       attrib,
1055                       usage_mask & TGSI_WRITEMASK_X ? "x" : "",
1056                       usage_mask & TGSI_WRITEMASK_Y ? "y" : "",
1057                       usage_mask & TGSI_WRITEMASK_Z ? "z" : "",
1058                       usage_mask & TGSI_WRITEMASK_W ? "w" : "");
1059       }
1060       debug_printf("\n");
1061    }
1062
1063    return shader;
1064 }
1065
1066
1067 static void
1068 llvmpipe_bind_fs_state(struct pipe_context *pipe, void *fs)
1069 {
1070    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
1071
1072    if (llvmpipe->fs == fs)
1073       return;
1074
1075    draw_flush(llvmpipe->draw);
1076
1077    llvmpipe->fs = (struct lp_fragment_shader *) fs;
1078
1079    draw_bind_fragment_shader(llvmpipe->draw,
1080                              (llvmpipe->fs ? llvmpipe->fs->draw_data : NULL));
1081
1082    llvmpipe->dirty |= LP_NEW_FS;
1083 }
1084
1085
1086 /**
1087  * Remove shader variant from two lists: the shader's variant list
1088  * and the context's variant list.
1089  */
1090 void
1091 llvmpipe_remove_shader_variant(struct llvmpipe_context *lp,
1092                                struct lp_fragment_shader_variant *variant)
1093 {
1094    unsigned i;
1095
1096    if (gallivm_debug & GALLIVM_DEBUG_IR) {
1097       debug_printf("llvmpipe: del fs #%u var #%u v created #%u v cached"
1098                    " #%u v total cached #%u\n",
1099                    variant->shader->no,
1100                    variant->no,
1101                    variant->shader->variants_created,
1102                    variant->shader->variants_cached,
1103                    lp->nr_fs_variants);
1104    }
1105
1106    /* free all the variant's JIT'd functions */
1107    for (i = 0; i < Elements(variant->function); i++) {
1108       if (variant->function[i]) {
1109          if (variant->jit_function[i])
1110             LLVMFreeMachineCodeForFunction(lp->gallivm->engine,
1111                                            variant->function[i]);
1112          LLVMDeleteFunction(variant->function[i]);
1113       }
1114    }
1115
1116    /* remove from shader's list */
1117    remove_from_list(&variant->list_item_local);
1118    variant->shader->variants_cached--;
1119
1120    /* remove from context's list */
1121    remove_from_list(&variant->list_item_global);
1122    lp->nr_fs_variants--;
1123
1124    FREE(variant);
1125 }
1126
1127
1128 static void
1129 llvmpipe_delete_fs_state(struct pipe_context *pipe, void *fs)
1130 {
1131    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
1132    struct lp_fragment_shader *shader = fs;
1133    struct lp_fs_variant_list_item *li;
1134
1135    assert(fs != llvmpipe->fs);
1136
1137    /*
1138     * XXX: we need to flush the context until we have some sort of reference
1139     * counting in fragment shaders as they may still be binned
1140     * Flushing alone might not sufficient we need to wait on it too.
1141     */
1142    llvmpipe_finish(pipe, __FUNCTION__);
1143
1144    /* Delete all the variants */
1145    li = first_elem(&shader->variants);
1146    while(!at_end(&shader->variants, li)) {
1147       struct lp_fs_variant_list_item *next = next_elem(li);
1148       llvmpipe_remove_shader_variant(llvmpipe, li->base);
1149       li = next;
1150    }
1151
1152    /* Delete draw module's data */
1153    draw_delete_fragment_shader(llvmpipe->draw, shader->draw_data);
1154
1155    assert(shader->variants_cached == 0);
1156    FREE((void *) shader->base.tokens);
1157    FREE(shader);
1158 }
1159
1160
1161
1162 static void
1163 llvmpipe_set_constant_buffer(struct pipe_context *pipe,
1164                              uint shader, uint index,
1165                              struct pipe_resource *constants)
1166 {
1167    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
1168    unsigned size = constants ? constants->width0 : 0;
1169    const void *data = constants ? llvmpipe_resource_data(constants) : NULL;
1170
1171    assert(shader < PIPE_SHADER_TYPES);
1172    assert(index < PIPE_MAX_CONSTANT_BUFFERS);
1173
1174    if(llvmpipe->constants[shader][index] == constants)
1175       return;
1176
1177    draw_flush(llvmpipe->draw);
1178
1179    /* note: reference counting */
1180    pipe_resource_reference(&llvmpipe->constants[shader][index], constants);
1181
1182    if(shader == PIPE_SHADER_VERTEX ||
1183       shader == PIPE_SHADER_GEOMETRY) {
1184       draw_set_mapped_constant_buffer(llvmpipe->draw, shader,
1185                                       index, data, size);
1186    }
1187
1188    llvmpipe->dirty |= LP_NEW_CONSTANTS;
1189 }
1190
1191
1192 /**
1193  * Return the blend factor equivalent to a destination alpha of one.
1194  */
1195 static INLINE unsigned
1196 force_dst_alpha_one(unsigned factor)
1197 {
1198    switch(factor) {
1199    case PIPE_BLENDFACTOR_DST_ALPHA:
1200       return PIPE_BLENDFACTOR_ONE;
1201    case PIPE_BLENDFACTOR_INV_DST_ALPHA:
1202       return PIPE_BLENDFACTOR_ZERO;
1203    case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
1204       return PIPE_BLENDFACTOR_ZERO;
1205    }
1206
1207    return factor;
1208 }
1209
1210
1211 /**
1212  * We need to generate several variants of the fragment pipeline to match
1213  * all the combinations of the contributing state atoms.
1214  *
1215  * TODO: there is actually no reason to tie this to context state -- the
1216  * generated code could be cached globally in the screen.
1217  */
1218 static void
1219 make_variant_key(struct llvmpipe_context *lp,
1220                  struct lp_fragment_shader *shader,
1221                  struct lp_fragment_shader_variant_key *key)
1222 {
1223    unsigned i;
1224
1225    memset(key, 0, shader->variant_key_size);
1226
1227    if (lp->framebuffer.zsbuf) {
1228       if (lp->depth_stencil->depth.enabled) {
1229          key->zsbuf_format = lp->framebuffer.zsbuf->format;
1230          memcpy(&key->depth, &lp->depth_stencil->depth, sizeof key->depth);
1231       }
1232       if (lp->depth_stencil->stencil[0].enabled) {
1233          key->zsbuf_format = lp->framebuffer.zsbuf->format;
1234          memcpy(&key->stencil, &lp->depth_stencil->stencil, sizeof key->stencil);
1235       }
1236    }
1237
1238    key->alpha.enabled = lp->depth_stencil->alpha.enabled;
1239    if(key->alpha.enabled)
1240       key->alpha.func = lp->depth_stencil->alpha.func;
1241    /* alpha.ref_value is passed in jit_context */
1242
1243    key->flatshade = lp->rasterizer->flatshade;
1244    if (lp->active_query_count) {
1245       key->occlusion_count = TRUE;
1246    }
1247
1248    if (lp->framebuffer.nr_cbufs) {
1249       memcpy(&key->blend, lp->blend, sizeof key->blend);
1250    }
1251
1252    key->nr_cbufs = lp->framebuffer.nr_cbufs;
1253    for (i = 0; i < lp->framebuffer.nr_cbufs; i++) {
1254       enum pipe_format format = lp->framebuffer.cbufs[i]->format;
1255       struct pipe_rt_blend_state *blend_rt = &key->blend.rt[i];
1256       const struct util_format_description *format_desc;
1257
1258       key->cbuf_format[i] = format;
1259
1260       format_desc = util_format_description(format);
1261       assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
1262              format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB);
1263
1264       blend_rt->colormask = lp->blend->rt[i].colormask;
1265
1266       /*
1267        * Mask out color channels not present in the color buffer.
1268        */
1269       blend_rt->colormask &= util_format_colormask(format_desc);
1270
1271       /*
1272        * Our swizzled render tiles always have an alpha channel, but the linear
1273        * render target format often does not, so force here the dst alpha to be
1274        * one.
1275        *
1276        * This is not a mere optimization. Wrong results will be produced if the
1277        * dst alpha is used, the dst format does not have alpha, and the previous
1278        * rendering was not flushed from the swizzled to linear buffer. For
1279        * example, NonPowTwo DCT.
1280        *
1281        * TODO: This should be generalized to all channels for better
1282        * performance, but only alpha causes correctness issues.
1283        *
1284        * Also, force rgb/alpha func/factors match, to make AoS blending easier.
1285        */
1286       if (format_desc->swizzle[3] > UTIL_FORMAT_SWIZZLE_W) {
1287          blend_rt->rgb_src_factor   = force_dst_alpha_one(blend_rt->rgb_src_factor);
1288          blend_rt->rgb_dst_factor   = force_dst_alpha_one(blend_rt->rgb_dst_factor);
1289          blend_rt->alpha_func       = blend_rt->rgb_func;
1290          blend_rt->alpha_src_factor = blend_rt->rgb_src_factor;
1291          blend_rt->alpha_dst_factor = blend_rt->rgb_dst_factor;
1292       }
1293    }
1294
1295    /* This value will be the same for all the variants of a given shader:
1296     */
1297    key->nr_samplers = shader->info.base.file_max[TGSI_FILE_SAMPLER] + 1;
1298
1299    for(i = 0; i < key->nr_samplers; ++i) {
1300       if(shader->info.base.file_mask[TGSI_FILE_SAMPLER] & (1 << i)) {
1301          lp_sampler_static_state(&key->sampler[i],
1302                                  lp->fragment_sampler_views[i],
1303                                  lp->sampler[i]);
1304       }
1305    }
1306 }
1307
1308
1309
1310 /**
1311  * Update fragment shader state.  This is called just prior to drawing
1312  * something when some fragment-related state has changed.
1313  */
1314 void
1315 llvmpipe_update_fs(struct llvmpipe_context *lp)
1316 {
1317    struct lp_fragment_shader *shader = lp->fs;
1318    struct lp_fragment_shader_variant_key key;
1319    struct lp_fragment_shader_variant *variant = NULL;
1320    struct lp_fs_variant_list_item *li;
1321
1322    make_variant_key(lp, shader, &key);
1323
1324    /* Search the variants for one which matches the key */
1325    li = first_elem(&shader->variants);
1326    while(!at_end(&shader->variants, li)) {
1327       if(memcmp(&li->base->key, &key, shader->variant_key_size) == 0) {
1328          variant = li->base;
1329          break;
1330       }
1331       li = next_elem(li);
1332    }
1333
1334    if (variant) {
1335       /* Move this variant to the head of the list to implement LRU
1336        * deletion of shader's when we have too many.
1337        */
1338       move_to_head(&lp->fs_variants_list, &variant->list_item_global);
1339    }
1340    else {
1341       /* variant not found, create it now */
1342       int64_t t0, t1, dt;
1343       unsigned i;
1344
1345       /* First, check if we've exceeded the max number of shader variants.
1346        * If so, free 25% of them (the least recently used ones).
1347        */
1348       if (lp->nr_fs_variants >= LP_MAX_SHADER_VARIANTS) {
1349          struct pipe_context *pipe = &lp->pipe;
1350
1351          /*
1352           * XXX: we need to flush the context until we have some sort of
1353           * reference counting in fragment shaders as they may still be binned
1354           * Flushing alone might not be sufficient we need to wait on it too.
1355           */
1356          llvmpipe_finish(pipe, __FUNCTION__);
1357
1358          for (i = 0; i < LP_MAX_SHADER_VARIANTS / 4; i++) {
1359             struct lp_fs_variant_list_item *item;
1360             item = last_elem(&lp->fs_variants_list);
1361             llvmpipe_remove_shader_variant(lp, item->base);
1362          }
1363       }
1364
1365       /*
1366        * Generate the new variant.
1367        */
1368       t0 = os_time_get();
1369       variant = generate_variant(lp, shader, &key);
1370       t1 = os_time_get();
1371       dt = t1 - t0;
1372       LP_COUNT_ADD(llvm_compile_time, dt);
1373       LP_COUNT_ADD(nr_llvm_compiles, 2);  /* emit vs. omit in/out test */
1374
1375       llvmpipe_variant_count++;
1376
1377       /* Put the new variant into the list */
1378       if (variant) {
1379          insert_at_head(&shader->variants, &variant->list_item_local);
1380          insert_at_head(&lp->fs_variants_list, &variant->list_item_global);
1381          lp->nr_fs_variants++;
1382          shader->variants_cached++;
1383       }
1384    }
1385
1386    /* Bind this variant */
1387    lp_setup_set_fs_variant(lp->setup, variant);
1388 }
1389
1390
1391
1392
1393
1394
1395
1396 void
1397 llvmpipe_init_fs_funcs(struct llvmpipe_context *llvmpipe)
1398 {
1399    llvmpipe->pipe.create_fs_state = llvmpipe_create_fs_state;
1400    llvmpipe->pipe.bind_fs_state   = llvmpipe_bind_fs_state;
1401    llvmpipe->pipe.delete_fs_state = llvmpipe_delete_fs_state;
1402
1403    llvmpipe->pipe.set_constant_buffer = llvmpipe_set_constant_buffer;
1404 }