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      1 /*
      2  * Copyright 2009 Corbin Simpson <MostAwesomeDude (at) gmail.com>
      3  * Copyright 2009 Marek Olk <maraeo (at) 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 }
    290