src/gallium/drivers/r300/r300_fs.c

   1 /*
   2  * Copyright 2008 Corbin Simpson <MostAwesomeDude@gmail.com>
   3  *                Joakim Sindholt <opensource@zhasha.com>
   4  * Copyright 2009 Marek Olšák <maraeo@gmail.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * on the rights to use, copy, modify, merge, publish, distribute, sub
  10  * license, and/or sell copies of the Software, and to permit persons to whom
  11  * the Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  21  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  22  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  23  * USE OR OTHER DEALINGS IN THE SOFTWARE. */
  24
  25 #include "util/u_math.h"
  26 #include "util/u_memory.h"
  27
  28 #include "tgsi/tgsi_dump.h"
  29 #include "tgsi/tgsi_ureg.h"
  30
  31 #include "r300_context.h"
  32 #include "r300_screen.h"
  33 #include "r300_fs.h"
  34 #include "r300_tgsi_to_rc.h"
  35
  36 #include "radeon_code.h"
  37 #include "radeon_compiler.h"
  38
  39 /* Convert info about FS input semantics to r300_shader_semantics. */
  40 void r300_shader_read_fs_inputs(struct tgsi_shader_info* info,
  41                                 struct r300_shader_semantics* fs_inputs)
  42 {
  43     int i;
  44     unsigned index;
  45
  46     r300_shader_semantics_reset(fs_inputs);
  47
  48     for (i = 0; i < info->num_inputs; i++) {
  49         index = info->input_semantic_index[i];
  50
  51         switch (info->input_semantic_name[i]) {
  52             case TGSI_SEMANTIC_COLOR:
  53                 assert(index < ATTR_COLOR_COUNT);
  54                 fs_inputs->color[index] = i;
  55                 break;
  56
  57             case TGSI_SEMANTIC_GENERIC:
  58                 assert(index < ATTR_GENERIC_COUNT);
  59                 fs_inputs->generic[index] = i;
  60                 break;
  61
  62             case TGSI_SEMANTIC_FOG:
  63                 assert(index == 0);
  64                 fs_inputs->fog = i;
  65                 break;
  66
  67             case TGSI_SEMANTIC_POSITION:
  68                 assert(index == 0);
  69                 fs_inputs->wpos = i;
  70                 break;
  71
  72             default:
  73                 fprintf(stderr, "r300: FP: Unknown input semantic: %i\n",
  74                         info->input_semantic_name[i]);
  75         }
  76     }
  77 }
  78
  79 static void find_output_registers(struct r300_fragment_program_compiler * compiler,
  80                                   struct r300_fragment_shader_code *shader)
  81 {
  82     unsigned i, colorbuf_count = 0;
  83
  84     /* Mark the outputs as not present initially */
  85     compiler->OutputColor[0] = shader->info.num_outputs;
  86     compiler->OutputColor[1] = shader->info.num_outputs;
  87     compiler->OutputColor[2] = shader->info.num_outputs;
  88     compiler->OutputColor[3] = shader->info.num_outputs;
  89     compiler->OutputDepth = shader->info.num_outputs;
  90
  91     /* Now see where they really are. */
  92     for(i = 0; i < shader->info.num_outputs; ++i) {
  93         switch(shader->info.output_semantic_name[i]) {
  94             case TGSI_SEMANTIC_COLOR:
  95                 compiler->OutputColor[colorbuf_count] = i;
  96                 colorbuf_count++;
  97                 break;
  98             case TGSI_SEMANTIC_POSITION:
  99                 compiler->OutputDepth = i;
 100                 break;
 101         }
 102     }
 103 }
 104
 105 static void allocate_hardware_inputs(
 106     struct r300_fragment_program_compiler * c,
 107     void (*allocate)(void * data, unsigned input, unsigned hwreg),
 108     void * mydata)
 109 {
 110     struct r300_shader_semantics* inputs =
 111         (struct r300_shader_semantics*)c->UserData;
 112     int i, reg = 0;
 113
 114     /* Allocate input registers. */
 115     for (i = 0; i < ATTR_COLOR_COUNT; i++) {
 116         if (inputs->color[i] != ATTR_UNUSED) {
 117             allocate(mydata, inputs->color[i], reg++);
 118         }
 119     }
 120     for (i = 0; i < ATTR_GENERIC_COUNT; i++) {
 121         if (inputs->generic[i] != ATTR_UNUSED) {
 122             allocate(mydata, inputs->generic[i], reg++);
 123         }
 124     }
 125     if (inputs->fog != ATTR_UNUSED) {
 126         allocate(mydata, inputs->fog, reg++);
 127     }
 128     if (inputs->wpos != ATTR_UNUSED) {
 129         allocate(mydata, inputs->wpos, reg++);
 130     }
 131 }
 132
 133 static void get_external_state(
 134     struct r300_context* r300,
 135     struct r300_fragment_program_external_state* state)
 136 {
 137     struct r300_textures_state *texstate = r300->textures_state.state;
 138     unsigned i;
 139
 140     for (i = 0; i < texstate->sampler_state_count; i++) {
 141         struct r300_sampler_state* s = texstate->sampler_states[i];
 142         struct r300_texture *t;
 143
 144         if (!s || !texstate->sampler_views[i]) {
 145             continue;
 146         }
 147
 148         t = (struct r300_texture*)texstate->sampler_views[i]->base.texture;
 149
 150         if (s->state.compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
 151             /* XXX Gallium doesn't provide us with any information regarding
 152              * this mode, so we are screwed. I'm setting 0 = LUMINANCE. */
 153             state->unit[i].depth_texture_mode = 0;
 154
 155             /* Fortunately, no need to translate this. */
 156             state->unit[i].texture_compare_func = s->state.compare_func;
 157         }
 158
 159         state->unit[i].fake_npot = t->uses_pitch;
 160         state->unit[i].non_normalized_coords = !s->state.normalized_coords;
 161
 162         /* XXX this should probably take into account STR, not just S. */
 163         switch (s->state.wrap_s) {
 164             case PIPE_TEX_WRAP_REPEAT:
 165                 state->unit[i].wrap_mode = RC_WRAP_REPEAT;
 166                 break;
 167             case PIPE_TEX_WRAP_CLAMP:
 168             case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
 169             case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
 170                 state->unit[i].wrap_mode = RC_WRAP_CLAMP;
 171                 break;
 172             case PIPE_TEX_WRAP_MIRROR_REPEAT:
 173             case PIPE_TEX_WRAP_MIRROR_CLAMP:
 174             case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
 175             case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
 176                 state->unit[i].wrap_mode = RC_WRAP_MIRROR;
 177                 break;
 178             default:
 179                 state->unit[i].wrap_mode = RC_WRAP_NONE;
 180                 break;
 181         }
 182     }
 183 }
 184
 185 static void r300_translate_fragment_shader(
 186     struct r300_context* r300,
 187     struct r300_fragment_shader_code* shader,
 188     const struct tgsi_token *tokens);
 189
 190 static void r300_dummy_fragment_shader(
 191     struct r300_context* r300,
 192     struct r300_fragment_shader_code* shader)
 193 {
 194     struct pipe_shader_state state;
 195     struct ureg_program *ureg;
 196     struct ureg_dst out;
 197     struct ureg_src imm;
 198
 199     /* Make a simple fragment shader which outputs (0, 0, 0, 1) */
 200     ureg = ureg_create(TGSI_PROCESSOR_FRAGMENT);
 201     out = ureg_DECL_output(ureg, TGSI_SEMANTIC_COLOR, 0);
 202     imm = ureg_imm4f(ureg, 0, 0, 0, 1);
 203
 204     ureg_MOV(ureg, out, imm);
 205     ureg_END(ureg);
 206
 207     state.tokens = ureg_finalize(ureg);
 208
 209     shader->dummy = TRUE;
 210     r300_translate_fragment_shader(r300, shader, state.tokens);
 211
 212     ureg_destroy(ureg);
 213 }
 214
 215 static void r300_translate_fragment_shader(
 216     struct r300_context* r300,
 217     struct r300_fragment_shader_code* shader,
 218     const struct tgsi_token *tokens)
 219 {
 220     struct r300_fragment_program_compiler compiler;
 221     struct tgsi_to_rc ttr;
 222     int wpos;
 223     unsigned i;
 224
 225     tgsi_scan_shader(tokens, &shader->info);
 226     r300_shader_read_fs_inputs(&shader->info, &shader->inputs);
 227
 228     wpos = shader->inputs.wpos;
 229
 230     /* Setup the compiler. */
 231     memset(&compiler, 0, sizeof(compiler));
 232     rc_init(&compiler.Base);
 233     compiler.Base.Debug = DBG_ON(r300, DBG_FP);
 234
 235     compiler.code = &shader->code;
 236     compiler.state = shader->compare_state;
 237     compiler.is_r500 = r300->screen->caps.is_r500;
 238     compiler.max_temp_regs = compiler.is_r500 ? 128 : 32;
 239     compiler.AllocateHwInputs = &allocate_hardware_inputs;
 240     compiler.UserData = &shader->inputs;
 241
 242     find_output_registers(&compiler, shader);
 243
 244     if (compiler.Base.Debug) {
 245         debug_printf("r300: Initial fragment program\n");
 246         tgsi_dump(tokens, 0);
 247     }
 248
 249     /* Translate TGSI to our internal representation */
 250     ttr.compiler = &compiler.Base;
 251     ttr.info = &shader->info;
 252     ttr.use_half_swizzles = TRUE;
 253
 254     r300_tgsi_to_rc(&ttr, tokens);
 255
 256     shader->shadow_samplers = compiler.Base.Program.ShadowSamplers;
 257
 258     /**
 259      * Transform the program to support WPOS.
 260      *
 261      * Introduce a small fragment at the start of the program that will be
 262      * the only code that directly reads the WPOS input.
 263      * All other code pieces that reference that input will be rewritten
 264      * to read from a newly allocated temporary. */
 265     if (wpos != ATTR_UNUSED) {
 266         /* Moving the input to some other reg is not really necessary. */
 267         rc_transform_fragment_wpos(&compiler.Base, wpos, wpos, TRUE);
 268     }
 269
 270     /* Invoke the compiler */
 271     r3xx_compile_fragment_program(&compiler);
 272
 273     if (compiler.Base.Error) {
 274         fprintf(stderr, "r300 FP: Compiler Error:\n%sUsing a dummy shader"
 275                 " instead.\n", compiler.Base.ErrorMsg);
 276
 277         if (shader->dummy) {
 278             fprintf(stderr, "r300 FP: Cannot compile the dummy shader! "
 279                     "Giving up...\n");
 280             abort();
 281         }
 282         r300_dummy_fragment_shader(r300, shader);
 283     }
 284
 285     /* Initialize numbers of constants for each type. */
 286     shader->externals_count = ttr.immediate_offset;
 287     shader->immediates_count = 0;
 288     shader->rc_state_count = 0;
 289
 290     for (i = shader->externals_count; i < shader->code.constants.Count; i++) {
 291         switch (shader->code.constants.Constants[i].Type) {
 292             case RC_CONSTANT_IMMEDIATE:
 293                 ++shader->immediates_count;
 294                 break;
 295             case RC_CONSTANT_STATE:
 296                 ++shader->rc_state_count;
 297                 break;
 298             default:
 299                 assert(0);
 300         }
 301     }
 302
 303     /* And, finally... */
 304     rc_destroy(&compiler.Base);
 305 }
 306
 307 boolean r300_pick_fragment_shader(struct r300_context* r300)
 308 {
 309     struct r300_fragment_shader* fs = r300_fs(r300);
 310     struct r300_fragment_program_external_state state = {{{ 0 }}};
 311     struct r300_fragment_shader_code* ptr;
 312
 313     get_external_state(r300, &state);
 314
 315     if (!fs->first) {
 316         /* Build the fragment shader for the first time. */
 317         fs->first = fs->shader = CALLOC_STRUCT(r300_fragment_shader_code);
 318
 319         memcpy(&fs->shader->compare_state, &state,
 320             sizeof(struct r300_fragment_program_external_state));
 321         r300_translate_fragment_shader(r300, fs->shader, fs->state.tokens);
 322         return TRUE;
 323
 324     } else {
 325         /* Check if the currently-bound shader has been compiled
 326          * with the texture-compare state we need. */
 327         if (memcmp(&fs->shader->compare_state, &state, sizeof(state)) != 0) {
 328             /* Search for the right shader. */
 329             ptr = fs->first;
 330             while (ptr) {
 331                 if (memcmp(&ptr->compare_state, &state, sizeof(state)) == 0) {
 332                     fs->shader = ptr;
 333                     return TRUE;
 334                 }
 335                 ptr = ptr->next;
 336             }
 337
 338             /* Not found, gotta compile a new one. */
 339             ptr = CALLOC_STRUCT(r300_fragment_shader_code);
 340             ptr->next = fs->first;
 341             fs->first = fs->shader = ptr;
 342
 343             ptr->compare_state = state;
 344             r300_translate_fragment_shader(r300, ptr, fs->state.tokens);
 345             return TRUE;
 346         }
 347     }
 348
 349     return FALSE;
 350 }