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
  30 #include "r300_context.h"
  31 #include "r300_screen.h"
  32 #include "r300_fs.h"
  33 #include "r300_tgsi_to_rc.h"
  34
  35 #include "radeon_code.h"
  36 #include "radeon_compiler.h"
  37
  38 /* Convert info about FS input semantics to r300_shader_semantics. */
  39 void r300_shader_read_fs_inputs(struct tgsi_shader_info* info,
  40                                 struct r300_shader_semantics* fs_inputs)
  41 {
  42     int i;
  43     unsigned index;
  44
  45     r300_shader_semantics_reset(fs_inputs);
  46
  47     for (i = 0; i < info->num_inputs; i++) {
  48         index = info->input_semantic_index[i];
  49
  50         switch (info->input_semantic_name[i]) {
  51             case TGSI_SEMANTIC_COLOR:
  52                 assert(index <= ATTR_COLOR_COUNT);
  53                 fs_inputs->color[index] = i;
  54                 break;
  55
  56             case TGSI_SEMANTIC_GENERIC:
  57                 assert(index <= ATTR_GENERIC_COUNT);
  58                 fs_inputs->generic[index] = i;
  59                 break;
  60
  61             case TGSI_SEMANTIC_FOG:
  62                 assert(index == 0);
  63                 fs_inputs->fog = i;
  64                 break;
  65
  66             default:
  67                 assert(0);
  68         }
  69     }
  70 }
  71
  72 static void find_output_registers(struct r300_fragment_program_compiler * compiler,
  73                                   struct r300_fragment_shader * fs)
  74 {
  75     unsigned i;
  76
  77     /* Mark the outputs as not present initially */
  78     compiler->OutputColor = fs->info.num_outputs;
  79     compiler->OutputDepth = fs->info.num_outputs;
  80
  81     /* Now see where they really are. */
  82     for(i = 0; i < fs->info.num_outputs; ++i) {
  83         switch(fs->info.output_semantic_name[i]) {
  84             case TGSI_SEMANTIC_COLOR:
  85                 compiler->OutputColor = i;
  86                 break;
  87             case TGSI_SEMANTIC_POSITION:
  88                 compiler->OutputDepth = i;
  89                 break;
  90         }
  91     }
  92 }
  93
  94 static void allocate_hardware_inputs(
  95     struct r300_fragment_program_compiler * c,
  96     void (*allocate)(void * data, unsigned input, unsigned hwreg),
  97     void * mydata)
  98 {
  99     struct r300_shader_semantics* inputs =
 100         (struct r300_shader_semantics*)c->UserData;
 101     int i, reg = 0;
 102
 103     /* Allocate input registers. */
 104     for (i = 0; i < ATTR_COLOR_COUNT; i++) {
 105         if (inputs->color[i] != ATTR_UNUSED) {
 106             allocate(mydata, inputs->color[i], reg++);
 107         }
 108     }
 109     for (i = 0; i < ATTR_GENERIC_COUNT; i++) {
 110         if (inputs->generic[i] != ATTR_UNUSED) {
 111             allocate(mydata, inputs->generic[i], reg++);
 112         }
 113     }
 114     if (inputs->fog != ATTR_UNUSED) {
 115         allocate(mydata, inputs->fog, reg++);
 116     }
 117 }
 118
 119 static void get_compare_state(
 120     struct r300_context* r300,
 121     struct r300_fragment_program_external_state* state,
 122     unsigned shadow_samplers)
 123 {
 124     memset(state, 0, sizeof(*state));
 125
 126     for (int i = 0; i < r300->sampler_count; i++) {
 127         struct r300_sampler_state* s = r300->sampler_states[i];
 128
 129         if (s && s->state.compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
 130             /* XXX Gallium doesn't provide us with any information regarding
 131              * this mode, so we are screwed. I'm setting 0 = LUMINANCE. */
 132             state->unit[i].depth_texture_mode = 0;
 133
 134             /* Fortunately, no need to translate this. */
 135             state->unit[i].texture_compare_func = s->state.compare_func;
 136         }
 137     }
 138 }
 139
 140 static void r300_translate_fragment_shader(
 141     struct r300_context* r300,
 142     struct r300_fragment_shader_code* shader)
 143 {
 144     struct r300_fragment_shader* fs = r300->fs;
 145     struct r300_fragment_program_compiler compiler;
 146     struct tgsi_to_rc ttr;
 147
 148     /* Setup the compiler. */
 149     memset(&compiler, 0, sizeof(compiler));
 150     rc_init(&compiler.Base);
 151     compiler.Base.Debug = DBG_ON(r300, DBG_FP);
 152
 153     compiler.code = &shader->code;
 154     compiler.state = shader->compare_state;
 155     compiler.is_r500 = r300_screen(r300->context.screen)->caps->is_r500;
 156     compiler.AllocateHwInputs = &allocate_hardware_inputs;
 157     compiler.UserData = &fs->inputs;
 158
 159     find_output_registers(&compiler, fs);
 160
 161     if (compiler.Base.Debug) {
 162         debug_printf("r300: Initial fragment program\n");
 163         tgsi_dump(fs->state.tokens, 0);
 164     }
 165
 166     /* Translate TGSI to our internal representation */
 167     ttr.compiler = &compiler.Base;
 168     ttr.info = &fs->info;
 169
 170     r300_tgsi_to_rc(&ttr, fs->state.tokens);
 171
 172     fs->shadow_samplers = compiler.Base.Program.ShadowSamplers;
 173
 174     /* Invoke the compiler */
 175     r3xx_compile_fragment_program(&compiler);
 176     if (compiler.Base.Error) {
 177         /* XXX failover maybe? */
 178         DBG(r300, DBG_FP, "r300: Error compiling fragment program: %s\n",
 179             compiler.Base.ErrorMsg);
 180         assert(0);
 181     }
 182
 183     /* And, finally... */
 184     rc_destroy(&compiler.Base);
 185 }
 186
 187 boolean r300_pick_fragment_shader(struct r300_context* r300)
 188 {
 189     struct r300_fragment_shader* fs = r300->fs;
 190     struct r300_fragment_program_external_state state;
 191     struct r300_fragment_shader_code* ptr;
 192
 193     if (!fs->first) {
 194         /* Build the fragment shader for the first time. */
 195         fs->first = fs->shader = CALLOC_STRUCT(r300_fragment_shader_code);
 196
 197         /* BTW shadow samplers will be known after the first translation,
 198          * therefore we set ~0, which means it should look at all sampler
 199          * states. This choice doesn't have any impact on the correctness. */
 200         get_compare_state(r300, &fs->shader->compare_state, ~0);
 201         r300_translate_fragment_shader(r300, fs->shader);
 202         return TRUE;
 203
 204     } else if (fs->shadow_samplers) {
 205         get_compare_state(r300, &state, fs->shadow_samplers);
 206
 207         /* Check if the currently-bound shader has been compiled
 208          * with the texture-compare state we need. */
 209         if (memcmp(&fs->shader->compare_state, &state, sizeof(state)) != 0) {
 210             /* Search for the right shader. */
 211             ptr = fs->first;
 212             while (ptr) {
 213                 if (memcmp(&ptr->compare_state, &state, sizeof(state)) == 0) {
 214                     fs->shader = ptr;
 215                     return TRUE;
 216                 }
 217                 ptr = ptr->next;
 218             }
 219
 220             /* Not found, gotta compile a new one. */
 221             ptr = CALLOC_STRUCT(r300_fragment_shader_code);
 222             ptr->next = fs->first;
 223             fs->first = fs->shader = ptr;
 224
 225             ptr->compare_state = state;
 226             r300_translate_fragment_shader(r300, ptr);
 227             return TRUE;
 228         }
 229     }
 230
 231     return FALSE;
 232 }