src/gallium/drivers/r300/r300_vs.c

   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(PIPE_SHADER_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 }