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
 143         if (!s) {
 144             continue;
 145         }
 146
 147         if (s->state.compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
 148             /* XXX Gallium doesn't provide us with any information regarding
 149              * this mode, so we are screwed. I'm setting 0 = LUMINANCE. */
 150             state->unit[i].depth_texture_mode = 0;
 151
 152             /* Fortunately, no need to translate this. */
 153             state->unit[i].texture_compare_func = s->state.compare_func;
 154         }
 155     }
 156 }
 157
 158 static void r300_translate_fragment_shader(
 159     struct r300_context* r300,
 160     struct r300_fragment_shader_code* shader,
 161     const struct tgsi_token *tokens);
 162
 163 static void r300_dummy_fragment_shader(
 164     struct r300_context* r300,
 165     struct r300_fragment_shader_code* shader)
 166 {
 167     struct pipe_shader_state state;
 168     struct ureg_program *ureg;
 169     struct ureg_dst out;
 170     struct ureg_src imm;
 171
 172     /* Make a simple fragment shader which outputs (0, 0, 0, 1) */
 173     ureg = ureg_create(TGSI_PROCESSOR_FRAGMENT);
 174     out = ureg_DECL_output(ureg, TGSI_SEMANTIC_COLOR, 0);
 175     imm = ureg_imm4f(ureg, 0, 0, 0, 1);
 176
 177     ureg_MOV(ureg, out, imm);
 178     ureg_END(ureg);
 179
 180     state.tokens = ureg_finalize(ureg);
 181
 182     shader->dummy = TRUE;
 183     r300_translate_fragment_shader(r300, shader, state.tokens);
 184
 185     ureg_destroy(ureg);
 186 }
 187
 188 static void r300_translate_fragment_shader(
 189     struct r300_context* r300,
 190     struct r300_fragment_shader_code* shader,
 191     const struct tgsi_token *tokens)
 192 {
 193     struct r300_fragment_program_compiler compiler;
 194     struct tgsi_to_rc ttr;
 195     int wpos;
 196     unsigned i;
 197
 198     tgsi_scan_shader(tokens, &shader->info);
 199     r300_shader_read_fs_inputs(&shader->info, &shader->inputs);
 200
 201     wpos = shader->inputs.wpos;
 202
 203     /* Setup the compiler. */
 204     memset(&compiler, 0, sizeof(compiler));
 205     rc_init(&compiler.Base);
 206     compiler.Base.Debug = DBG_ON(r300, DBG_FP);
 207
 208     compiler.code = &shader->code;
 209     compiler.state = shader->compare_state;
 210     compiler.is_r500 = r300->screen->caps.is_r500;
 211     compiler.max_temp_regs = compiler.is_r500 ? 128 : 32;
 212     compiler.AllocateHwInputs = &allocate_hardware_inputs;
 213     compiler.UserData = &shader->inputs;
 214
 215     find_output_registers(&compiler, shader);
 216
 217     if (compiler.Base.Debug) {
 218         debug_printf("r300: Initial fragment program\n");
 219         tgsi_dump(tokens, 0);
 220     }
 221
 222     /* Translate TGSI to our internal representation */
 223     ttr.compiler = &compiler.Base;
 224     ttr.info = &shader->info;
 225     ttr.use_half_swizzles = TRUE;
 226
 227     r300_tgsi_to_rc(&ttr, tokens);
 228
 229     shader->shadow_samplers = compiler.Base.Program.ShadowSamplers;
 230
 231     /**
 232      * Transform the program to support WPOS.
 233      *
 234      * Introduce a small fragment at the start of the program that will be
 235      * the only code that directly reads the WPOS input.
 236      * All other code pieces that reference that input will be rewritten
 237      * to read from a newly allocated temporary. */
 238     if (wpos != ATTR_UNUSED) {
 239         /* Moving the input to some other reg is not really necessary. */
 240         rc_transform_fragment_wpos(&compiler.Base, wpos, wpos, TRUE);
 241     }
 242
 243     /* Invoke the compiler */
 244     r3xx_compile_fragment_program(&compiler);
 245
 246     if (compiler.Base.Error) {
 247         fprintf(stderr, "r300 FP: Compiler Error:\n%sUsing a dummy shader"
 248                 " instead.\n", compiler.Base.ErrorMsg);
 249
 250         if (shader->dummy) {
 251             fprintf(stderr, "r300 FP: Cannot compile the dummy shader! "
 252                     "Giving up...\n");
 253             abort();
 254         }
 255         r300_dummy_fragment_shader(r300, shader);
 256     }
 257
 258     /* Initialize numbers of constants for each type. */
 259     shader->externals_count = ttr.immediate_offset;
 260     shader->immediates_count = 0;
 261     shader->rc_state_count = 0;
 262
 263     for (i = shader->externals_count; i < shader->code.constants.Count; i++) {
 264         switch (shader->code.constants.Constants[i].Type) {
 265             case RC_CONSTANT_IMMEDIATE:
 266                 ++shader->immediates_count;
 267                 break;
 268             case RC_CONSTANT_STATE:
 269                 ++shader->rc_state_count;
 270                 break;
 271             default:
 272                 assert(0);
 273         }
 274     }
 275
 276     /* And, finally... */
 277     rc_destroy(&compiler.Base);
 278 }
 279
 280 boolean r300_pick_fragment_shader(struct r300_context* r300)
 281 {
 282     struct r300_fragment_shader* fs = r300_fs(r300);
 283     struct r300_fragment_program_external_state state = {{{ 0 }}};
 284     struct r300_fragment_shader_code* ptr;
 285
 286     get_external_state(r300, &state);
 287
 288     if (!fs->first) {
 289         /* Build the fragment shader for the first time. */
 290         fs->first = fs->shader = CALLOC_STRUCT(r300_fragment_shader_code);
 291
 292         memcpy(&fs->shader->compare_state, &state,
 293             sizeof(struct r300_fragment_program_external_state));
 294         r300_translate_fragment_shader(r300, fs->shader, fs->state.tokens);
 295         return TRUE;
 296
 297     } else {
 298         /* Check if the currently-bound shader has been compiled
 299          * with the texture-compare state we need. */
 300         if (memcmp(&fs->shader->compare_state, &state, sizeof(state)) != 0) {
 301             /* Search for the right shader. */
 302             ptr = fs->first;
 303             while (ptr) {
 304                 if (memcmp(&ptr->compare_state, &state, sizeof(state)) == 0) {
 305                     fs->shader = ptr;
 306                     return TRUE;
 307                 }
 308                 ptr = ptr->next;
 309             }
 310
 311             /* Not found, gotta compile a new one. */
 312             ptr = CALLOC_STRUCT(r300_fragment_shader_code);
 313             ptr->next = fs->first;
 314             fs->first = fs->shader = ptr;
 315
 316             ptr->compare_state = state;
 317             r300_translate_fragment_shader(r300, ptr, fs->state.tokens);
 318             return TRUE;
 319         }
 320     }
 321
 322     return FALSE;
 323 }