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                 break;
  76
  77             case TGSI_SEMANTIC_FOG:
  78                 assert(index == 0);
  79                 vs_outputs->fog = i;
  80                 break;
  81
  82             case TGSI_SEMANTIC_EDGEFLAG:
  83                 assert(index == 0);
  84                 fprintf(stderr, "r300 VP: cannot handle edgeflag output.\n");
  85                 break;
  86
  87             case TGSI_SEMANTIC_CLIPVERTEX:
  88                 assert(index == 0);
  89                 /* Draw does clip vertex for us. */
  90                 if (r300->screen->caps.has_tcl) {
  91                     fprintf(stderr, "r300 VP: cannot handle clip vertex output.\n");
  92                 }
  93                 break;
  94
  95             default:
  96                 fprintf(stderr, "r300 VP: unknown vertex output semantic: %i.\n",
  97                         info->output_semantic_name[i]);
  98         }
  99     }
 100
 101     /* WPOS is a straight copy of POSITION and it's always emitted. */
 102     vs_outputs->wpos = i;
 103 }
 104
 105 static void set_vertex_inputs_outputs(struct r300_vertex_program_compiler * c)
 106 {
 107     struct r300_vertex_shader * vs = c->UserData;
 108     struct r300_shader_semantics* outputs = &vs->outputs;
 109     struct tgsi_shader_info* info = &vs->info;
 110     int i, reg = 0;
 111     boolean any_bcolor_used = outputs->bcolor[0] != ATTR_UNUSED ||
 112                               outputs->bcolor[1] != ATTR_UNUSED;
 113
 114     /* Fill in the input mapping */
 115     for (i = 0; i < info->num_inputs; i++)
 116         c->code->inputs[i] = i;
 117
 118     /* Position. */
 119     if (outputs->pos != ATTR_UNUSED) {
 120         c->code->outputs[outputs->pos] = reg++;
 121     } else {
 122         assert(0);
 123     }
 124
 125     /* Point size. */
 126     if (outputs->psize != ATTR_UNUSED) {
 127         c->code->outputs[outputs->psize] = reg++;
 128     }
 129
 130     /* If we're writing back facing colors we need to send
 131      * four colors to make front/back face colors selection work.
 132      * If the vertex program doesn't write all 4 colors, lets
 133      * pretend it does by skipping output index reg so the colors
 134      * get written into appropriate output vectors.
 135      */
 136
 137     /* Colors. */
 138     for (i = 0; i < ATTR_COLOR_COUNT; i++) {
 139         if (outputs->color[i] != ATTR_UNUSED) {
 140             c->code->outputs[outputs->color[i]] = reg++;
 141         } else if (any_bcolor_used ||
 142                    outputs->color[1] != ATTR_UNUSED) {
 143             reg++;
 144         }
 145     }
 146
 147     /* Back-face colors. */
 148     for (i = 0; i < ATTR_COLOR_COUNT; i++) {
 149         if (outputs->bcolor[i] != ATTR_UNUSED) {
 150             c->code->outputs[outputs->bcolor[i]] = reg++;
 151         } else if (any_bcolor_used) {
 152             reg++;
 153         }
 154     }
 155
 156     /* Texture coordinates. */
 157     for (i = 0; i < ATTR_GENERIC_COUNT; i++) {
 158         if (outputs->generic[i] != ATTR_UNUSED) {
 159             c->code->outputs[outputs->generic[i]] = reg++;
 160         }
 161     }
 162
 163     /* Fog coordinates. */
 164     if (outputs->fog != ATTR_UNUSED) {
 165         c->code->outputs[outputs->fog] = reg++;
 166     }
 167
 168     /* WPOS. */
 169     c->code->outputs[outputs->wpos] = reg++;
 170 }
 171
 172 void r300_init_vs_outputs(struct r300_context *r300,
 173                           struct r300_vertex_shader *vs)
 174 {
 175     tgsi_scan_shader(vs->state.tokens, &vs->info);
 176     r300_shader_read_vs_outputs(r300, &vs->info, &vs->outputs);
 177 }
 178
 179 static void r300_dummy_vertex_shader(
 180     struct r300_context* r300,
 181     struct r300_vertex_shader* shader)
 182 {
 183     struct ureg_program *ureg;
 184     struct ureg_dst dst;
 185     struct ureg_src imm;
 186
 187     /* Make a simple vertex shader which outputs (0, 0, 0, 1),
 188      * effectively rendering nothing. */
 189     ureg = ureg_create(TGSI_PROCESSOR_VERTEX);
 190     dst = ureg_DECL_output(ureg, TGSI_SEMANTIC_POSITION, 0);
 191     imm = ureg_imm4f(ureg, 0, 0, 0, 1);
 192
 193     ureg_MOV(ureg, dst, imm);
 194     ureg_END(ureg);
 195
 196     shader->state.tokens = tgsi_dup_tokens(ureg_finalize(ureg));
 197     ureg_destroy(ureg);
 198
 199     shader->dummy = TRUE;
 200     r300_init_vs_outputs(r300, shader);
 201     r300_translate_vertex_shader(r300, shader);
 202 }
 203
 204 void r300_translate_vertex_shader(struct r300_context *r300,
 205                                   struct r300_vertex_shader *vs)
 206 {
 207     struct r300_vertex_program_compiler compiler;
 208     struct tgsi_to_rc ttr;
 209     unsigned i;
 210
 211     /* Setup the compiler */
 212     memset(&compiler, 0, sizeof(compiler));
 213     rc_init(&compiler.Base, NULL);
 214
 215     DBG_ON(r300, DBG_VP) ? compiler.Base.Debug |= RC_DBG_LOG : 0;
 216     DBG_ON(r300, DBG_P_STAT) ? compiler.Base.Debug |= RC_DBG_STATS : 0;
 217     compiler.code = &vs->code;
 218     compiler.UserData = vs;
 219     compiler.Base.is_r500 = r300->screen->caps.is_r500;
 220     compiler.Base.disable_optimizations = DBG_ON(r300, DBG_NO_OPT);
 221     compiler.Base.has_half_swizzles = FALSE;
 222     compiler.Base.has_presub = FALSE;
 223     compiler.Base.has_omod = FALSE;
 224     compiler.Base.max_temp_regs = 32;
 225     compiler.Base.max_constants = 256;
 226     compiler.Base.max_alu_insts = r300->screen->caps.is_r500 ? 1024 : 256;
 227
 228     if (compiler.Base.Debug & RC_DBG_LOG) {
 229         DBG(r300, DBG_VP, "r300: Initial vertex program\n");
 230         tgsi_dump(vs->state.tokens, 0);
 231     }
 232
 233     /* Translate TGSI to our internal representation */
 234     ttr.compiler = &compiler.Base;
 235     ttr.info = &vs->info;
 236     ttr.use_half_swizzles = FALSE;
 237
 238     r300_tgsi_to_rc(&ttr, vs->state.tokens);
 239
 240     if (ttr.error) {
 241         fprintf(stderr, "r300 VP: Cannot translate a shader. "
 242                 "Using a dummy shader instead.\n");
 243         r300_dummy_vertex_shader(r300, vs);
 244         return;
 245     }
 246
 247     if (compiler.Base.Program.Constants.Count > 200) {
 248         compiler.Base.remove_unused_constants = TRUE;
 249     }
 250
 251     compiler.RequiredOutputs = ~(~0 << (vs->info.num_outputs + 1));
 252     compiler.SetHwInputOutput = &set_vertex_inputs_outputs;
 253
 254     /* Insert the WPOS output. */
 255     rc_copy_output(&compiler.Base, 0, vs->outputs.wpos);
 256
 257     /* Invoke the compiler */
 258     r3xx_compile_vertex_program(&compiler);
 259     if (compiler.Base.Error) {
 260         fprintf(stderr, "r300 VP: Compiler error:\n%sUsing a dummy shader"
 261                 " instead.\n", compiler.Base.ErrorMsg);
 262
 263         if (vs->dummy) {
 264             fprintf(stderr, "r300 VP: Cannot compile the dummy shader! "
 265                     "Giving up...\n");
 266             abort();
 267         }
 268
 269         rc_destroy(&compiler.Base);
 270         r300_dummy_vertex_shader(r300, vs);
 271         return;
 272     }
 273
 274     /* Initialize numbers of constants for each type. */
 275     vs->externals_count = 0;
 276     for (i = 0;
 277          i < vs->code.constants.Count &&
 278          vs->code.constants.Constants[i].Type == RC_CONSTANT_EXTERNAL; i++) {
 279         vs->externals_count = i+1;
 280     }
 281     for (; i < vs->code.constants.Count; i++) {
 282         assert(vs->code.constants.Constants[i].Type == RC_CONSTANT_IMMEDIATE);
 283     }
 284     vs->immediates_count = vs->code.constants.Count - vs->externals_count;
 285
 286     /* And, finally... */
 287     rc_destroy(&compiler.Base);
 288 }