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 #include "r300_fs.h"
  26
  27 #include "r300_context.h"
  28 #include "r300_screen.h"
  29 #include "r300_tgsi_to_rc.h"
  30 #include "r300_reg.h"
  31
  32 #include "tgsi/tgsi_dump.h"
  33 #include "tgsi/tgsi_parse.h"
  34
  35 #include "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 tgsi_shader_info* info,
  40     struct r300_shader_semantics* vs_outputs)
  41 {
  42     int i;
  43     unsigned index;
  44
  45     r300_shader_semantics_reset(vs_outputs);
  46
  47     for (i = 0; i < info->num_outputs; i++) {
  48         index = info->output_semantic_index[i];
  49
  50         switch (info->output_semantic_name[i]) {
  51             case TGSI_SEMANTIC_POSITION:
  52                 assert(index == 0);
  53                 vs_outputs->pos = i;
  54                 break;
  55
  56             case TGSI_SEMANTIC_PSIZE:
  57                 assert(index == 0);
  58                 vs_outputs->psize = i;
  59                 break;
  60
  61             case TGSI_SEMANTIC_COLOR:
  62                 assert(index < ATTR_COLOR_COUNT);
  63                 vs_outputs->color[index] = i;
  64                 break;
  65
  66             case TGSI_SEMANTIC_BCOLOR:
  67                 assert(index < ATTR_COLOR_COUNT);
  68                 vs_outputs->bcolor[index] = i;
  69                 break;
  70
  71             case TGSI_SEMANTIC_GENERIC:
  72                 assert(index < ATTR_GENERIC_COUNT);
  73                 vs_outputs->generic[index] = i;
  74                 break;
  75
  76             case TGSI_SEMANTIC_FOG:
  77                 assert(index == 0);
  78                 vs_outputs->fog = i;
  79                 break;
  80
  81             case TGSI_SEMANTIC_EDGEFLAG:
  82                 assert(index == 0);
  83                 fprintf(stderr, "r300 VP: cannot handle edgeflag output\n");
  84                 assert(0);
  85                 break;
  86             default:
  87                 assert(0);
  88         }
  89     }
  90
  91     /* WPOS is a straight copy of POSITION and it's always emitted. */
  92     vs_outputs->wpos = i;
  93 }
  94
  95 /* This function sets up:
  96  * - VAP mapping, which maps VS registers to output semantics and
  97  *   at the same time it indicates which attributes are enabled and should
  98  *   be rasterized.
  99  * - Stream mapping to VS outputs if TCL is not present. */
 100 static void r300_init_vs_output_mapping(struct r300_vertex_shader* vs)
 101 {
 102     struct r300_shader_semantics* vs_outputs = &vs->outputs;
 103     struct r300_vap_output_state *vap_out = &vs->vap_out;
 104     int *stream_loc = vs->stream_loc_notcl;
 105     int i, gen_count, tabi = 0;
 106     boolean any_bcolor_used = vs_outputs->bcolor[0] != ATTR_UNUSED ||
 107                               vs_outputs->bcolor[1] != ATTR_UNUSED;
 108
 109     vap_out->vap_vtx_state_cntl = 0x5555; /* XXX this is classic Mesa bonghits */
 110
 111     /* Position. */
 112     if (vs_outputs->pos != ATTR_UNUSED) {
 113         vap_out->vap_vsm_vtx_assm |= R300_INPUT_CNTL_POS;
 114         vap_out->vap_out_vtx_fmt[0] |= R300_VAP_OUTPUT_VTX_FMT_0__POS_PRESENT;
 115
 116         stream_loc[tabi++] = 0;
 117     } else {
 118         assert(0);
 119     }
 120
 121     /* Point size. */
 122     if (vs_outputs->psize != ATTR_UNUSED) {
 123         vap_out->vap_out_vtx_fmt[0] |= R300_VAP_OUTPUT_VTX_FMT_0__PT_SIZE_PRESENT;
 124
 125         stream_loc[tabi++] = 1;
 126     }
 127
 128     /* Colors. */
 129     for (i = 0; i < ATTR_COLOR_COUNT; i++) {
 130         if (vs_outputs->color[i] != ATTR_UNUSED || any_bcolor_used ||
 131             vs_outputs->color[1] != ATTR_UNUSED) {
 132             vap_out->vap_vsm_vtx_assm |= R300_INPUT_CNTL_COLOR;
 133             vap_out->vap_out_vtx_fmt[0] |= R300_VAP_OUTPUT_VTX_FMT_0__COLOR_0_PRESENT << i;
 134
 135             stream_loc[tabi++] = 2 + i;
 136         }
 137     }
 138
 139     /* Back-face colors. */
 140     if (any_bcolor_used) {
 141         for (i = 0; i < ATTR_COLOR_COUNT; i++) {
 142             vap_out->vap_vsm_vtx_assm |= R300_INPUT_CNTL_COLOR;
 143             vap_out->vap_out_vtx_fmt[0] |= R300_VAP_OUTPUT_VTX_FMT_0__COLOR_0_PRESENT << (2+i);
 144
 145             stream_loc[tabi++] = 4 + i;
 146         }
 147     }
 148
 149     /* Texture coordinates. */
 150     gen_count = 0;
 151     for (i = 0; i < ATTR_GENERIC_COUNT; i++) {
 152         if (vs_outputs->generic[i] != ATTR_UNUSED) {
 153             vap_out->vap_vsm_vtx_assm |= (R300_INPUT_CNTL_TC0 << gen_count);
 154             vap_out->vap_out_vtx_fmt[1] |= (4 << (3 * gen_count));
 155
 156             assert(tabi < 16);
 157             stream_loc[tabi++] = 6 + gen_count;
 158             gen_count++;
 159         }
 160     }
 161
 162     /* Fog coordinates. */
 163     if (vs_outputs->fog != ATTR_UNUSED) {
 164         vap_out->vap_vsm_vtx_assm |= (R300_INPUT_CNTL_TC0 << gen_count);
 165         vap_out->vap_out_vtx_fmt[1] |= (4 << (3 * gen_count));
 166
 167         assert(tabi < 16);
 168         stream_loc[tabi++] = 6 + gen_count;
 169         gen_count++;
 170     }
 171
 172     /* XXX magic */
 173     assert(gen_count <= 8);
 174
 175     /* WPOS. */
 176     vs->wpos_tex_output = gen_count;
 177
 178     assert(tabi < 16);
 179     stream_loc[tabi++] = 6 + gen_count;
 180
 181     for (; tabi < 16;) {
 182         stream_loc[tabi++] = -1;
 183     }
 184 }
 185
 186 static void set_vertex_inputs_outputs(struct r300_vertex_program_compiler * c)
 187 {
 188     struct r300_vertex_shader * vs = c->UserData;
 189     struct r300_shader_semantics* outputs = &vs->outputs;
 190     struct tgsi_shader_info* info = &vs->info;
 191     int i, reg = 0;
 192     boolean any_bcolor_used = outputs->bcolor[0] != ATTR_UNUSED ||
 193                               outputs->bcolor[1] != ATTR_UNUSED;
 194
 195     /* Fill in the input mapping */
 196     for (i = 0; i < info->num_inputs; i++)
 197         c->code->inputs[i] = i;
 198
 199     /* Position. */
 200     if (outputs->pos != ATTR_UNUSED) {
 201         c->code->outputs[outputs->pos] = reg++;
 202     } else {
 203         assert(0);
 204     }
 205
 206     /* Point size. */
 207     if (outputs->psize != ATTR_UNUSED) {
 208         c->code->outputs[outputs->psize] = reg++;
 209     }
 210
 211     /* If we're writing back facing colors we need to send
 212      * four colors to make front/back face colors selection work.
 213      * If the vertex program doesn't write all 4 colors, lets
 214      * pretend it does by skipping output index reg so the colors
 215      * get written into appropriate output vectors.
 216      */
 217
 218     /* Colors. */
 219     for (i = 0; i < ATTR_COLOR_COUNT; i++) {
 220         if (outputs->color[i] != ATTR_UNUSED) {
 221             c->code->outputs[outputs->color[i]] = reg++;
 222         } else if (any_bcolor_used ||
 223                    outputs->color[1] != ATTR_UNUSED) {
 224             reg++;
 225         }
 226     }
 227
 228     /* Back-face colors. */
 229     for (i = 0; i < ATTR_COLOR_COUNT; i++) {
 230         if (outputs->bcolor[i] != ATTR_UNUSED) {
 231             c->code->outputs[outputs->bcolor[i]] = reg++;
 232         } else if (any_bcolor_used) {
 233             reg++;
 234         }
 235     }
 236
 237     /* Texture coordinates. */
 238     for (i = 0; i < ATTR_GENERIC_COUNT; i++) {
 239         if (outputs->generic[i] != ATTR_UNUSED) {
 240             c->code->outputs[outputs->generic[i]] = reg++;
 241         }
 242     }
 243
 244     /* Fog coordinates. */
 245     if (outputs->fog != ATTR_UNUSED) {
 246         c->code->outputs[outputs->fog] = reg++;
 247     }
 248
 249     /* WPOS. */
 250     if (outputs->wpos != ATTR_UNUSED) {
 251         c->code->outputs[outputs->wpos] = reg++;
 252     }
 253 }
 254
 255 void r300_vertex_shader_common_init(struct r300_vertex_shader *vs,
 256                                     const struct pipe_shader_state *shader)
 257 {
 258     /* Copy state directly into shader. */
 259     vs->state = *shader;
 260     vs->state.tokens = tgsi_dup_tokens(shader->tokens);
 261     tgsi_scan_shader(shader->tokens, &vs->info);
 262
 263     r300_shader_read_vs_outputs(&vs->info, &vs->outputs);
 264     r300_init_vs_output_mapping(vs);
 265 }
 266
 267 void r300_translate_vertex_shader(struct r300_context* r300,
 268                                   struct r300_vertex_shader* vs)
 269 {
 270     struct r300_vertex_program_compiler compiler;
 271     struct tgsi_to_rc ttr;
 272
 273     /* Setup the compiler */
 274     rc_init(&compiler.Base);
 275
 276     compiler.Base.Debug = DBG_ON(r300, DBG_VP);
 277     compiler.code = &vs->code;
 278     compiler.UserData = vs;
 279
 280     if (compiler.Base.Debug) {
 281         debug_printf("r300: Initial vertex program\n");
 282         tgsi_dump(vs->state.tokens, 0);
 283     }
 284
 285     /* Translate TGSI to our internal representation */
 286     ttr.compiler = &compiler.Base;
 287     ttr.info = &vs->info;
 288     ttr.use_half_swizzles = FALSE;
 289
 290     r300_tgsi_to_rc(&ttr, vs->state.tokens);
 291
 292     compiler.RequiredOutputs = ~(~0 << (vs->info.num_outputs+1));
 293     compiler.SetHwInputOutput = &set_vertex_inputs_outputs;
 294
 295     /* Insert the WPOS output. */
 296     rc_copy_output(&compiler.Base, 0, vs->outputs.wpos);
 297
 298     /* Invoke the compiler */
 299     r3xx_compile_vertex_program(&compiler);
 300     if (compiler.Base.Error) {
 301         /* XXX We should fallback using Draw. */
 302         fprintf(stderr, "r300 VP: Compiler error\n");
 303         abort();
 304     }
 305
 306     /* And, finally... */
 307     rc_destroy(&compiler.Base);
 308 }
 309
 310 boolean r300_vertex_shader_setup_wpos(struct r300_context* r300)
 311 {
 312     struct r300_vertex_shader* vs = r300->vs_state.state;
 313     struct r300_vap_output_state *vap_out = &vs->vap_out;
 314     int tex_output = vs->wpos_tex_output;
 315     uint32_t tex_fmt = R300_INPUT_CNTL_TC0 << tex_output;
 316
 317     if (r300->fs->inputs.wpos != ATTR_UNUSED) {
 318         /* Enable WPOS in VAP. */
 319         if (!(vap_out->vap_vsm_vtx_assm & tex_fmt)) {
 320             vap_out->vap_vsm_vtx_assm |= tex_fmt;
 321             vap_out->vap_out_vtx_fmt[1] |= (4 << (3 * tex_output));
 322
 323             assert(tex_output < 8);
 324             return TRUE;
 325         }
 326     } else {
 327         /* Disable WPOS in VAP. */
 328         if (vap_out->vap_vsm_vtx_assm & tex_fmt) {
 329             vap_out->vap_vsm_vtx_assm &= ~tex_fmt;
 330             vap_out->vap_out_vtx_fmt[1] &= ~(4 << (3 * tex_output));
 331             return TRUE;
 332         }
 333     }
 334     return FALSE;
 335 }