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  1. /*
  2.  * Copyright 2009 Corbin Simpson <MostAwesomeDude@gmail.com>
  3.  * Copyright 2009 Marek Olšák <maraeo@gmail.com>
  4.  *
  5.  * Permission is hereby granted, free of charge, to any person obtaining a
  6.  * copy of this software and associated documentation files (the "Software"),
  7.  * to deal in the Software without restriction, including without limitation
  8.  * on the rights to use, copy, modify, merge, publish, distribute, sub
  9.  * license, and/or sell copies of the Software, and to permit persons to whom
  10.  * the Software is furnished to do so, subject to the following conditions:
  11.  *
  12.  * The above copyright notice and this permission notice (including the next
  13.  * paragraph) shall be included in all copies or substantial portions of the
  14.  * Software.
  15.  *
  16.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18.  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  19.  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  20.  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  21.  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  22.  * USE OR OTHER DEALINGS IN THE SOFTWARE. */
  23.  
  24. #include "r300_vs.h"
  25.  
  26. #include "r300_context.h"
  27. #include "r300_screen.h"
  28. #include "r300_tgsi_to_rc.h"
  29. #include "r300_reg.h"
  30.  
  31. #include "tgsi/tgsi_dump.h"
  32. #include "tgsi/tgsi_parse.h"
  33. #include "tgsi/tgsi_ureg.h"
  34.  
  35. #include "compiler/radeon_compiler.h"
  36.  
  37. /* Convert info about VS output semantics into r300_shader_semantics. */
  38. static void r300_shader_read_vs_outputs(
  39.     struct r300_context *r300,
  40.     struct tgsi_shader_info* info,
  41.     struct r300_shader_semantics* vs_outputs)
  42. {
  43.     int i;
  44.     unsigned index;
  45.  
  46.     r300_shader_semantics_reset(vs_outputs);
  47.  
  48.     for (i = 0; i < info->num_outputs; i++) {
  49.         index = info->output_semantic_index[i];
  50.  
  51.         switch (info->output_semantic_name[i]) {
  52.             case TGSI_SEMANTIC_POSITION:
  53.                 assert(index == 0);
  54.                 vs_outputs->pos = i;
  55.                 break;
  56.  
  57.             case TGSI_SEMANTIC_PSIZE:
  58.                 assert(index == 0);
  59.                 vs_outputs->psize = i;
  60.                 break;
  61.  
  62.             case TGSI_SEMANTIC_COLOR:
  63.                 assert(index < ATTR_COLOR_COUNT);
  64.                 vs_outputs->color[index] = i;
  65.                 break;
  66.  
  67.             case TGSI_SEMANTIC_BCOLOR:
  68.                 assert(index < ATTR_COLOR_COUNT);
  69.                 vs_outputs->bcolor[index] = i;
  70.                 break;
  71.  
  72.             case TGSI_SEMANTIC_GENERIC:
  73.                 assert(index < ATTR_GENERIC_COUNT);
  74.                 vs_outputs->generic[index] = i;
  75.                 vs_outputs->num_generic++;
  76.                 break;
  77.  
  78.             case TGSI_SEMANTIC_FOG:
  79.                 assert(index == 0);
  80.                 vs_outputs->fog = i;
  81.                 break;
  82.  
  83.             case TGSI_SEMANTIC_EDGEFLAG:
  84.                 assert(index == 0);
  85.                 fprintf(stderr, "r300 VP: cannot handle edgeflag output.\n");
  86.                 break;
  87.  
  88.             case TGSI_SEMANTIC_CLIPVERTEX:
  89.                 assert(index == 0);
  90.                 /* Draw does clip vertex for us. */
  91.                 if (r300->screen->caps.has_tcl) {
  92.                     fprintf(stderr, "r300 VP: cannot handle clip vertex output.\n");
  93.                 }
  94.                 break;
  95.  
  96.             default:
  97.                 fprintf(stderr, "r300 VP: unknown vertex output semantic: %i.\n",
  98.                         info->output_semantic_name[i]);
  99.         }
  100.     }
  101.  
  102.     /* WPOS is a straight copy of POSITION and it's always emitted. */
  103.     vs_outputs->wpos = i;
  104. }
  105.  
  106. static void set_vertex_inputs_outputs(struct r300_vertex_program_compiler * c)
  107. {
  108.     struct r300_vertex_shader * vs = c->UserData;
  109.     struct r300_shader_semantics* outputs = &vs->outputs;
  110.     struct tgsi_shader_info* info = &vs->info;
  111.     int i, reg = 0;
  112.     boolean any_bcolor_used = outputs->bcolor[0] != ATTR_UNUSED ||
  113.                               outputs->bcolor[1] != ATTR_UNUSED;
  114.  
  115.     /* Fill in the input mapping */
  116.     for (i = 0; i < info->num_inputs; i++)
  117.         c->code->inputs[i] = i;
  118.  
  119.     /* Position. */
  120.     if (outputs->pos != ATTR_UNUSED) {
  121.         c->code->outputs[outputs->pos] = reg++;
  122.     } else {
  123.         assert(0);
  124.     }
  125.  
  126.     /* Point size. */
  127.     if (outputs->psize != ATTR_UNUSED) {
  128.         c->code->outputs[outputs->psize] = reg++;
  129.     }
  130.  
  131.     /* If we're writing back facing colors we need to send
  132.      * four colors to make front/back face colors selection work.
  133.      * If the vertex program doesn't write all 4 colors, lets
  134.      * pretend it does by skipping output index reg so the colors
  135.      * get written into appropriate output vectors.
  136.      */
  137.  
  138.     /* Colors. */
  139.     for (i = 0; i < ATTR_COLOR_COUNT; i++) {
  140.         if (outputs->color[i] != ATTR_UNUSED) {
  141.             c->code->outputs[outputs->color[i]] = reg++;
  142.         } else if (any_bcolor_used ||
  143.                    outputs->color[1] != ATTR_UNUSED) {
  144.             reg++;
  145.         }
  146.     }
  147.  
  148.     /* Back-face colors. */
  149.     for (i = 0; i < ATTR_COLOR_COUNT; i++) {
  150.         if (outputs->bcolor[i] != ATTR_UNUSED) {
  151.             c->code->outputs[outputs->bcolor[i]] = reg++;
  152.         } else if (any_bcolor_used) {
  153.             reg++;
  154.         }
  155.     }
  156.  
  157.     /* Texture coordinates. */
  158.     for (i = 0; i < ATTR_GENERIC_COUNT; i++) {
  159.         if (outputs->generic[i] != ATTR_UNUSED) {
  160.             c->code->outputs[outputs->generic[i]] = reg++;
  161.         }
  162.     }
  163.  
  164.     /* Fog coordinates. */
  165.     if (outputs->fog != ATTR_UNUSED) {
  166.         c->code->outputs[outputs->fog] = reg++;
  167.     }
  168.  
  169.     /* WPOS. */
  170.     c->code->outputs[outputs->wpos] = reg++;
  171. }
  172.  
  173. void r300_init_vs_outputs(struct r300_context *r300,
  174.                           struct r300_vertex_shader *vs)
  175. {
  176.     tgsi_scan_shader(vs->state.tokens, &vs->info);
  177.     r300_shader_read_vs_outputs(r300, &vs->info, &vs->outputs);
  178. }
  179.  
  180. static void r300_dummy_vertex_shader(
  181.     struct r300_context* r300,
  182.     struct r300_vertex_shader* shader)
  183. {
  184.     struct ureg_program *ureg;
  185.     struct ureg_dst dst;
  186.     struct ureg_src imm;
  187.  
  188.     /* Make a simple vertex shader which outputs (0, 0, 0, 1),
  189.      * effectively rendering nothing. */
  190.     ureg = ureg_create(TGSI_PROCESSOR_VERTEX);
  191.     dst = ureg_DECL_output(ureg, TGSI_SEMANTIC_POSITION, 0);
  192.     imm = ureg_imm4f(ureg, 0, 0, 0, 1);
  193.  
  194.     ureg_MOV(ureg, dst, imm);
  195.     ureg_END(ureg);
  196.  
  197.     shader->state.tokens = tgsi_dup_tokens(ureg_finalize(ureg));
  198.     ureg_destroy(ureg);
  199.  
  200.     shader->dummy = TRUE;
  201.     r300_init_vs_outputs(r300, shader);
  202.     r300_translate_vertex_shader(r300, shader);
  203. }
  204.  
  205. void r300_translate_vertex_shader(struct r300_context *r300,
  206.                                   struct r300_vertex_shader *vs)
  207. {
  208.     struct r300_vertex_program_compiler compiler;
  209.     struct tgsi_to_rc ttr;
  210.     unsigned i;
  211.  
  212.     /* Setup the compiler */
  213.     memset(&compiler, 0, sizeof(compiler));
  214.     rc_init(&compiler.Base, NULL);
  215.  
  216.     DBG_ON(r300, DBG_VP) ? compiler.Base.Debug |= RC_DBG_LOG : 0;
  217.     DBG_ON(r300, DBG_P_STAT) ? compiler.Base.Debug |= RC_DBG_STATS : 0;
  218.     compiler.code = &vs->code;
  219.     compiler.UserData = vs;
  220.     compiler.Base.is_r500 = r300->screen->caps.is_r500;
  221.     compiler.Base.disable_optimizations = DBG_ON(r300, DBG_NO_OPT);
  222.     compiler.Base.has_half_swizzles = FALSE;
  223.     compiler.Base.has_presub = FALSE;
  224.     compiler.Base.has_omod = FALSE;
  225.     compiler.Base.max_temp_regs = 32;
  226.     compiler.Base.max_constants = 256;
  227.     compiler.Base.max_alu_insts = r300->screen->caps.is_r500 ? 1024 : 256;
  228.  
  229.     if (compiler.Base.Debug & RC_DBG_LOG) {
  230.         DBG(r300, DBG_VP, "r300: Initial vertex program\n");
  231.         tgsi_dump(vs->state.tokens, 0);
  232.     }
  233.  
  234.     /* Translate TGSI to our internal representation */
  235.     ttr.compiler = &compiler.Base;
  236.     ttr.info = &vs->info;
  237.     ttr.use_half_swizzles = FALSE;
  238.  
  239.     r300_tgsi_to_rc(&ttr, vs->state.tokens);
  240.  
  241.     if (ttr.error) {
  242.         fprintf(stderr, "r300 VP: Cannot translate a shader. "
  243.                 "Using a dummy shader instead.\n");
  244.         r300_dummy_vertex_shader(r300, vs);
  245.         return;
  246.     }
  247.  
  248.     if (compiler.Base.Program.Constants.Count > 200) {
  249.         compiler.Base.remove_unused_constants = TRUE;
  250.     }
  251.  
  252.     compiler.RequiredOutputs = ~(~0 << (vs->info.num_outputs + 1));
  253.     compiler.SetHwInputOutput = &set_vertex_inputs_outputs;
  254.  
  255.     /* Insert the WPOS output. */
  256.     rc_copy_output(&compiler.Base, 0, vs->outputs.wpos);
  257.  
  258.     /* Invoke the compiler */
  259.     r3xx_compile_vertex_program(&compiler);
  260.     if (compiler.Base.Error) {
  261.         fprintf(stderr, "r300 VP: Compiler error:\n%sUsing a dummy shader"
  262.                 " instead.\n", compiler.Base.ErrorMsg);
  263.  
  264.         if (vs->dummy) {
  265.             fprintf(stderr, "r300 VP: Cannot compile the dummy shader! "
  266.                     "Giving up...\n");
  267.             abort();
  268.         }
  269.  
  270.         rc_destroy(&compiler.Base);
  271.         r300_dummy_vertex_shader(r300, vs);
  272.         return;
  273.     }
  274.  
  275.     /* Initialize numbers of constants for each type. */
  276.     vs->externals_count = 0;
  277.     for (i = 0;
  278.          i < vs->code.constants.Count &&
  279.          vs->code.constants.Constants[i].Type == RC_CONSTANT_EXTERNAL; i++) {
  280.         vs->externals_count = i+1;
  281.     }
  282.     for (; i < vs->code.constants.Count; i++) {
  283.         assert(vs->code.constants.Constants[i].Type == RC_CONSTANT_IMMEDIATE);
  284.     }
  285.     vs->immediates_count = vs->code.constants.Count - vs->externals_count;
  286.  
  287.     /* And, finally... */
  288.     rc_destroy(&compiler.Base);
  289. }
  290.