src/gallium/auxiliary/draw/draw_vs_aos_machine.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 #include "pipe/p_config.h"
  30
  31
  32 #include "pipe/p_shader_tokens.h"
  33 #include "util/u_math.h"
  34 #include "util/u_memory.h"
  35 #include "tgsi/tgsi_parse.h"
  36 #include "tgsi/tgsi_util.h"
  37 #include "tgsi/tgsi_exec.h"
  38 #include "draw_vs.h"
  39 #include "draw_vs_aos.h"
  40 #include "draw_vertex.h"
  41
  42 #ifdef PIPE_ARCH_X86
  43
  44 #include "rtasm/rtasm_x86sse.h"
  45
  46
  47 #define X87_CW_EXCEPTION_INV_OP       (1<<0)
  48 #define X87_CW_EXCEPTION_DENORM_OP    (1<<1)
  49 #define X87_CW_EXCEPTION_ZERO_DIVIDE  (1<<2)
  50 #define X87_CW_EXCEPTION_OVERFLOW     (1<<3)
  51 #define X87_CW_EXCEPTION_UNDERFLOW    (1<<4)
  52 #define X87_CW_EXCEPTION_PRECISION    (1<<5)
  53 #define X87_CW_PRECISION_SINGLE       (0<<8)
  54 #define X87_CW_PRECISION_RESERVED     (1<<8)
  55 #define X87_CW_PRECISION_DOUBLE       (2<<8)
  56 #define X87_CW_PRECISION_DOUBLE_EXT   (3<<8)
  57 #define X87_CW_PRECISION_MASK         (3<<8)
  58 #define X87_CW_ROUND_NEAREST          (0<<10)
  59 #define X87_CW_ROUND_DOWN             (1<<10)
  60 #define X87_CW_ROUND_UP               (2<<10)
  61 #define X87_CW_ROUND_ZERO             (3<<10)
  62 #define X87_CW_ROUND_MASK             (3<<10)
  63 #define X87_CW_INFINITY               (1<<12)
  64
  65
  66 void PIPE_CDECL aos_do_lit( struct aos_machine *machine,
  67                             float *result,
  68                             const float *in,
  69                             unsigned count )
  70 {
  71    if (in[0] > 0)
  72    {
  73       if (in[1] <= 0.0)
  74       {
  75          result[0] = 1.0F;
  76          result[1] = in[0];
  77          result[2] = 1.0;
  78          result[3] = 1.0F;
  79       }
  80       else
  81       {
  82          const float epsilon = 1.0F / 256.0F;
  83          float exponent = CLAMP(in[3], -(128.0F - epsilon), (128.0F - epsilon));
  84          result[0] = 1.0F;
  85          result[1] = in[0];
  86          result[2] = powf(in[1], exponent);
  87          result[3] = 1.0;
  88       }
  89    }
  90    else
  91    {
  92       result[0] = 1.0F;
  93       result[1] = 0.0;
  94       result[2] = 0.0;
  95       result[3] = 1.0F;
  96    }
  97 }
  98
  99
 100 static void PIPE_CDECL do_lit_lut( struct aos_machine *machine,
 101                                    float *result,
 102                                    const float *in,
 103                                    unsigned count )
 104 {
 105    if (in[0] > 0)
 106    {
 107       if (in[1] <= 0.0)
 108       {
 109          result[0] = 1.0F;
 110          result[1] = in[0];
 111          result[2] = 1.0;
 112          result[3] = 1.0F;
 113          return;
 114       }
 115
 116       if (machine->lit_info[count].shine_tab->exponent != in[3]) {
 117          machine->lit_info[count].func = aos_do_lit;
 118          goto no_luck;
 119       }
 120
 121       if (in[1] <= 1.0)
 122       {
 123          const float *tab = machine->lit_info[count].shine_tab->values;
 124          float f = in[1] * 256;
 125          int k = (int)f;
 126          float frac = f - (float)k;
 127
 128          result[0] = 1.0F;
 129          result[1] = in[0];
 130          result[2] = tab[k] + frac*(tab[k+1]-tab[k]);
 131          result[3] = 1.0;
 132          return;
 133       }
 134
 135    no_luck:
 136       {
 137          const float epsilon = 1.0F / 256.0F;
 138          float exponent = CLAMP(in[3], -(128.0F - epsilon), (128.0F - epsilon));
 139          result[0] = 1.0F;
 140          result[1] = in[0];
 141          result[2] = powf(in[1], exponent);
 142          result[3] = 1.0;
 143       }
 144    }
 145    else
 146    {
 147       result[0] = 1.0F;
 148       result[1] = 0.0;
 149       result[2] = 0.0;
 150       result[3] = 1.0F;
 151    }
 152 }
 153
 154
 155 static void do_populate_lut( struct shine_tab *tab,
 156                              float unclamped_exponent )
 157 {
 158    const float epsilon = 1.0F / 256.0F;
 159    float exponent = CLAMP(unclamped_exponent, -(128.0F - epsilon), (128.0F - epsilon));
 160    unsigned i;
 161
 162    tab->exponent = unclamped_exponent; /* for later comparison */
 163
 164    tab->values[0] = 0;
 165    if (exponent == 0) {
 166       for (i = 1; i < 258; i++) {
 167          tab->values[i] = 1.0;
 168       }
 169    }
 170    else {
 171       for (i = 1; i < 258; i++) {
 172          tab->values[i] = powf((float)i * epsilon, exponent);
 173       }
 174    }
 175 }
 176
 177
 178
 179
 180 static void PIPE_CDECL populate_lut( struct aos_machine *machine,
 181                                      float *result,
 182                                      const float *in,
 183                                      unsigned count )
 184 {
 185    unsigned i, tab;
 186
 187    /* Search for an existing table for this value.  Note that without
 188     * static analysis we don't really know if in[3] will be constant,
 189     * but it usually is...
 190     */
 191    for (tab = 0; tab < 4; tab++) {
 192       if (machine->shine_tab[tab].exponent == in[3]) {
 193          goto found;
 194       }
 195    }
 196
 197    for (tab = 0, i = 1; i < 4; i++) {
 198       if (machine->shine_tab[i].last_used < machine->shine_tab[tab].last_used)
 199          tab = i;
 200    }
 201
 202    if (machine->shine_tab[tab].last_used == machine->now) {
 203       /* No unused tables (this is not a ffvertex program...).  Just
 204        * call pow each time:
 205        */
 206       machine->lit_info[count].func = aos_do_lit;
 207       machine->lit_info[count].func( machine, result, in, count );
 208       return;
 209    }
 210    else {
 211       do_populate_lut( &machine->shine_tab[tab], in[3] );
 212    }
 213
 214  found:
 215    machine->shine_tab[tab].last_used = machine->now;
 216    machine->lit_info[count].shine_tab = &machine->shine_tab[tab];
 217    machine->lit_info[count].func = do_lit_lut;
 218    machine->lit_info[count].func( machine, result, in, count );
 219 }
 220
 221
 222 void draw_vs_aos_machine_constants( struct aos_machine *machine,
 223                                     const float (*constants)[4] )
 224 {
 225    machine->constants = constants;
 226
 227    {
 228       unsigned i;
 229       for (i = 0; i < MAX_LIT_INFO; i++) {
 230          machine->lit_info[i].func = populate_lut;
 231          machine->now++;
 232       }
 233    }
 234 }
 235
 236
 237 void draw_vs_aos_machine_viewport( struct aos_machine *machine,
 238                                    const struct pipe_viewport_state *viewport )
 239 {
 240    memcpy(machine->scale, viewport->scale, 4 * sizeof(float));
 241    memcpy(machine->translate, viewport->translate, 4 * sizeof(float));
 242 }
 243
 244
 245
 246 void draw_vs_aos_machine_destroy( struct aos_machine *machine )
 247 {
 248    align_free(machine);
 249 }
 250
 251 struct aos_machine *draw_vs_aos_machine( void )
 252 {
 253    struct aos_machine *machine;
 254    unsigned i;
 255    float inv = 1.0f/255.0f;
 256    float f255 = 255.0f;
 257
 258    machine = align_malloc(sizeof(struct aos_machine), 16);
 259    if (!machine)
 260       return NULL;
 261
 262    memset(machine, 0, sizeof(*machine));
 263
 264    ASSIGN_4V(machine->internal[IMM_SWZ],       1.0f,  -1.0f,  0.0f, 1.0f);
 265    *(unsigned *)&machine->internal[IMM_SWZ][3] = 0xffffffff;
 266
 267    ASSIGN_4V(machine->internal[IMM_ONES],      1.0f,  1.0f,  1.0f,  1.0f);
 268    ASSIGN_4V(machine->internal[IMM_NEGS],     -1.0f, -1.0f, -1.0f, -1.0f);
 269    ASSIGN_4V(machine->internal[IMM_IDENTITY],  0.0f,  0.0f,  0.0f,  1.0f);
 270    ASSIGN_4V(machine->internal[IMM_INV_255],   inv,   inv,   inv,   inv);
 271    ASSIGN_4V(machine->internal[IMM_255],       f255,  f255,  f255,  f255);
 272    ASSIGN_4V(machine->internal[IMM_RSQ],       -.5f,  1.5f,  0.0f,  0.0f);
 273
 274
 275    machine->fpu_rnd_nearest = (X87_CW_EXCEPTION_INV_OP |
 276                                X87_CW_EXCEPTION_DENORM_OP |
 277                                X87_CW_EXCEPTION_ZERO_DIVIDE |
 278                                X87_CW_EXCEPTION_OVERFLOW |
 279                                X87_CW_EXCEPTION_UNDERFLOW |
 280                                X87_CW_EXCEPTION_PRECISION |
 281                                (1<<6) |
 282                                X87_CW_ROUND_NEAREST |
 283                                X87_CW_PRECISION_DOUBLE_EXT);
 284
 285    assert(machine->fpu_rnd_nearest == 0x37f);
 286
 287    machine->fpu_rnd_neg_inf = (X87_CW_EXCEPTION_INV_OP |
 288                                X87_CW_EXCEPTION_DENORM_OP |
 289                                X87_CW_EXCEPTION_ZERO_DIVIDE |
 290                                X87_CW_EXCEPTION_OVERFLOW |
 291                                X87_CW_EXCEPTION_UNDERFLOW |
 292                                X87_CW_EXCEPTION_PRECISION |
 293                                (1<<6) |
 294                                X87_CW_ROUND_DOWN |
 295                                X87_CW_PRECISION_DOUBLE_EXT);
 296
 297    for (i = 0; i < MAX_SHINE_TAB; i++)
 298       do_populate_lut( &machine->shine_tab[i], 1.0f );
 299
 300    return machine;
 301 }
 302
 303 #else
 304
 305 void draw_vs_aos_machine_viewport( struct aos_machine *machine,
 306                                    const struct pipe_viewport_state *viewport )
 307 {
 308 }
 309
 310 void draw_vs_aos_machine_constants( struct aos_machine *machine,
 311                                     const float (*constants)[4] )
 312 {
 313 }
 314
 315 void draw_vs_aos_machine_destroy( struct aos_machine *machine )
 316 {
 317 }
 318
 319 struct aos_machine *draw_vs_aos_machine( void )
 320 {
 321    return NULL;
 322 }
 323 #endif
 324