| 1 | /*************************************************************************** |
| 2 | * Copyright (C) 2010 by Blade_Arma * |
| 3 | * * |
| 4 | * This program is free software; you can redistribute it and/or modify * |
| 5 | * it under the terms of the GNU General Public License as published by * |
| 6 | * the Free Software Foundation; either version 2 of the License, or * |
| 7 | * (at your option) any later version. * |
| 8 | * * |
| 9 | * This program is distributed in the hope that it will be useful, * |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
| 12 | * GNU General Public License for more details. * |
| 13 | * * |
| 14 | * You should have received a copy of the GNU General Public License * |
| 15 | * along with this program; if not, write to the * |
| 16 | * Free Software Foundation, Inc., * |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA. * |
| 18 | ***************************************************************************/ |
| 19 | |
| 20 | /* |
| 21 | * Internal PSX counters. |
| 22 | */ |
| 23 | |
| 24 | #include "psxcounters.h" |
| 25 | #include "gpu.h" |
| 26 | //#include "debug.h" |
| 27 | #define DebugVSync() |
| 28 | |
| 29 | /******************************************************************************/ |
| 30 | |
| 31 | enum |
| 32 | { |
| 33 | RcSyncModeEnable = 0x0001, // 0 |
| 34 | Rc01BlankPause = 0 << 1, // 1,2 |
| 35 | Rc01UnblankReset = 1 << 1, // 1,2 |
| 36 | Rc01UnblankReset2 = 2 << 1, // 1,2 |
| 37 | Rc2Stop = 0 << 1, // 1,2 |
| 38 | Rc2Stop2 = 3 << 1, // 1,2 |
| 39 | RcCountToTarget = 0x0008, // 3 |
| 40 | RcIrqOnTarget = 0x0010, // 4 |
| 41 | RcIrqOnOverflow = 0x0020, // 5 |
| 42 | RcIrqRegenerate = 0x0040, // 6 |
| 43 | RcUnknown7 = 0x0080, // 7 ? |
| 44 | Rc0PixelClock = 0x0100, // 8 fake implementation |
| 45 | Rc1HSyncClock = 0x0100, // 8 |
| 46 | Rc2Unknown8 = 0x0100, // 8 ? |
| 47 | Rc0Unknown9 = 0x0200, // 9 ? |
| 48 | Rc1Unknown9 = 0x0200, // 9 ? |
| 49 | Rc2OneEighthClock = 0x0200, // 9 |
| 50 | RcUnknown10 = 0x0400, // 10 ? |
| 51 | RcCountEqTarget = 0x0800, // 11 |
| 52 | RcOverflow = 0x1000, // 12 |
| 53 | RcUnknown13 = 0x2000, // 13 ? (always zero) |
| 54 | RcUnknown14 = 0x4000, // 14 ? (always zero) |
| 55 | RcUnknown15 = 0x8000, // 15 ? (always zero) |
| 56 | }; |
| 57 | |
| 58 | #define CounterQuantity ( 4 ) |
| 59 | //static const u32 CounterQuantity = 4; |
| 60 | |
| 61 | static const u32 CountToOverflow = 0; |
| 62 | static const u32 CountToTarget = 1; |
| 63 | |
| 64 | static const u32 HSyncTotal[] = { 263, 314 }; |
| 65 | #define VBlankStart 240 // todo: depend on the actual GPU setting |
| 66 | |
| 67 | #define VERBOSE_LEVEL 0 |
| 68 | |
| 69 | /******************************************************************************/ |
| 70 | #ifdef DRC_DISABLE |
| 71 | Rcnt rcnts[ CounterQuantity ]; |
| 72 | #endif |
| 73 | u32 hSyncCount = 0; |
| 74 | u32 frame_counter = 0; |
| 75 | static u32 hsync_steps = 0; |
| 76 | |
| 77 | u32 psxNextCounter = 0, psxNextsCounter = 0; |
| 78 | |
| 79 | /******************************************************************************/ |
| 80 | |
| 81 | static inline |
| 82 | u32 lineCycles(void) |
| 83 | { |
| 84 | if (Config.PsxType) |
| 85 | return PSXCLK / 50 / HSyncTotal[1]; |
| 86 | else |
| 87 | return PSXCLK / 60 / HSyncTotal[0]; |
| 88 | } |
| 89 | |
| 90 | static inline |
| 91 | void setIrq( u32 irq ) |
| 92 | { |
| 93 | psxHu32ref(0x1070) |= SWAPu32(irq); |
| 94 | } |
| 95 | |
| 96 | static |
| 97 | void verboseLog( u32 level, const char *str, ... ) |
| 98 | { |
| 99 | #if VERBOSE_LEVEL > 0 |
| 100 | if( level <= VERBOSE_LEVEL ) |
| 101 | { |
| 102 | va_list va; |
| 103 | char buf[ 4096 ]; |
| 104 | |
| 105 | va_start( va, str ); |
| 106 | vsprintf( buf, str, va ); |
| 107 | va_end( va ); |
| 108 | |
| 109 | printf( "%s", buf ); |
| 110 | fflush( stdout ); |
| 111 | } |
| 112 | #endif |
| 113 | } |
| 114 | |
| 115 | /******************************************************************************/ |
| 116 | |
| 117 | static inline |
| 118 | void _psxRcntWcount( u32 index, u32 value ) |
| 119 | { |
| 120 | if( value > 0xffff ) |
| 121 | { |
| 122 | verboseLog( 1, "[RCNT %i] wcount > 0xffff: %x\n", index, value ); |
| 123 | value &= 0xffff; |
| 124 | } |
| 125 | |
| 126 | rcnts[index].cycleStart = psxRegs.cycle; |
| 127 | rcnts[index].cycleStart -= value * rcnts[index].rate; |
| 128 | |
| 129 | // TODO: <=. |
| 130 | if( value < rcnts[index].target ) |
| 131 | { |
| 132 | rcnts[index].cycle = rcnts[index].target * rcnts[index].rate; |
| 133 | rcnts[index].counterState = CountToTarget; |
| 134 | } |
| 135 | else |
| 136 | { |
| 137 | rcnts[index].cycle = 0x10000 * rcnts[index].rate; |
| 138 | rcnts[index].counterState = CountToOverflow; |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | static inline |
| 143 | u32 _psxRcntRcount( u32 index ) |
| 144 | { |
| 145 | u32 count; |
| 146 | |
| 147 | count = psxRegs.cycle; |
| 148 | count -= rcnts[index].cycleStart; |
| 149 | if (rcnts[index].rate > 1) |
| 150 | count /= rcnts[index].rate; |
| 151 | |
| 152 | if( count > 0x10000 ) |
| 153 | { |
| 154 | verboseLog( 1, "[RCNT %i] rcount > 0x10000: %x\n", index, count ); |
| 155 | } |
| 156 | count &= 0xffff; |
| 157 | |
| 158 | return count; |
| 159 | } |
| 160 | |
| 161 | static |
| 162 | void _psxRcntWmode( u32 index, u32 value ) |
| 163 | { |
| 164 | rcnts[index].mode = value; |
| 165 | |
| 166 | switch( index ) |
| 167 | { |
| 168 | case 0: |
| 169 | if( value & Rc0PixelClock ) |
| 170 | { |
| 171 | rcnts[index].rate = 5; |
| 172 | } |
| 173 | else |
| 174 | { |
| 175 | rcnts[index].rate = 1; |
| 176 | } |
| 177 | break; |
| 178 | case 1: |
| 179 | if( value & Rc1HSyncClock ) |
| 180 | { |
| 181 | rcnts[index].rate = lineCycles(); |
| 182 | } |
| 183 | else |
| 184 | { |
| 185 | rcnts[index].rate = 1; |
| 186 | } |
| 187 | break; |
| 188 | case 2: |
| 189 | if( value & Rc2OneEighthClock ) |
| 190 | { |
| 191 | rcnts[index].rate = 8; |
| 192 | } |
| 193 | else |
| 194 | { |
| 195 | rcnts[index].rate = 1; |
| 196 | } |
| 197 | |
| 198 | // TODO: wcount must work. |
| 199 | if( (value & 7) == (RcSyncModeEnable | Rc2Stop) || |
| 200 | (value & 7) == (RcSyncModeEnable | Rc2Stop2) ) |
| 201 | { |
| 202 | rcnts[index].rate = 0xffffffff; |
| 203 | } |
| 204 | break; |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | /******************************************************************************/ |
| 209 | |
| 210 | static |
| 211 | void psxRcntSet() |
| 212 | { |
| 213 | s32 countToUpdate; |
| 214 | u32 i; |
| 215 | |
| 216 | psxNextsCounter = psxRegs.cycle; |
| 217 | psxNextCounter = 0x7fffffff; |
| 218 | |
| 219 | for( i = 0; i < CounterQuantity; ++i ) |
| 220 | { |
| 221 | countToUpdate = rcnts[i].cycle - (psxNextsCounter - rcnts[i].cycleStart); |
| 222 | |
| 223 | if( countToUpdate < 0 ) |
| 224 | { |
| 225 | psxNextCounter = 0; |
| 226 | break; |
| 227 | } |
| 228 | |
| 229 | if( countToUpdate < (s32)psxNextCounter ) |
| 230 | { |
| 231 | psxNextCounter = countToUpdate; |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | psxRegs.interrupt |= (1 << PSXINT_RCNT); |
| 236 | new_dyna_set_event(PSXINT_RCNT, psxNextCounter); |
| 237 | } |
| 238 | |
| 239 | /******************************************************************************/ |
| 240 | |
| 241 | static |
| 242 | void psxRcntReset( u32 index ) |
| 243 | { |
| 244 | u32 rcycles; |
| 245 | |
| 246 | rcnts[index].mode |= RcUnknown10; |
| 247 | |
| 248 | if( rcnts[index].counterState == CountToTarget ) |
| 249 | { |
| 250 | rcycles = psxRegs.cycle - rcnts[index].cycleStart; |
| 251 | if( rcnts[index].mode & RcCountToTarget ) |
| 252 | { |
| 253 | rcycles -= rcnts[index].target * rcnts[index].rate; |
| 254 | rcnts[index].cycleStart = psxRegs.cycle - rcycles; |
| 255 | } |
| 256 | else |
| 257 | { |
| 258 | rcnts[index].cycle = 0x10000 * rcnts[index].rate; |
| 259 | rcnts[index].counterState = CountToOverflow; |
| 260 | } |
| 261 | |
| 262 | if( rcnts[index].mode & RcIrqOnTarget ) |
| 263 | { |
| 264 | if( (rcnts[index].mode & RcIrqRegenerate) || (!rcnts[index].irqState) ) |
| 265 | { |
| 266 | verboseLog( 3, "[RCNT %i] irq\n", index ); |
| 267 | setIrq( rcnts[index].irq ); |
| 268 | rcnts[index].irqState = 1; |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | rcnts[index].mode |= RcCountEqTarget; |
| 273 | |
| 274 | if( rcycles < 0x10000 * rcnts[index].rate ) |
| 275 | return; |
| 276 | } |
| 277 | |
| 278 | if( rcnts[index].counterState == CountToOverflow ) |
| 279 | { |
| 280 | rcycles = psxRegs.cycle - rcnts[index].cycleStart; |
| 281 | rcycles -= 0x10000 * rcnts[index].rate; |
| 282 | |
| 283 | rcnts[index].cycleStart = psxRegs.cycle - rcycles; |
| 284 | |
| 285 | if( rcycles < rcnts[index].target * rcnts[index].rate ) |
| 286 | { |
| 287 | rcnts[index].cycle = rcnts[index].target * rcnts[index].rate; |
| 288 | rcnts[index].counterState = CountToTarget; |
| 289 | } |
| 290 | |
| 291 | if( rcnts[index].mode & RcIrqOnOverflow ) |
| 292 | { |
| 293 | if( (rcnts[index].mode & RcIrqRegenerate) || (!rcnts[index].irqState) ) |
| 294 | { |
| 295 | verboseLog( 3, "[RCNT %i] irq\n", index ); |
| 296 | setIrq( rcnts[index].irq ); |
| 297 | rcnts[index].irqState = 1; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | rcnts[index].mode |= RcOverflow; |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | static void scheduleRcntBase(void) |
| 306 | { |
| 307 | // Schedule next call, in hsyncs |
| 308 | if (hSyncCount < VBlankStart) |
| 309 | hsync_steps = VBlankStart - hSyncCount; |
| 310 | else |
| 311 | hsync_steps = HSyncTotal[Config.PsxType] - hSyncCount; |
| 312 | |
| 313 | if (hSyncCount + hsync_steps == HSyncTotal[Config.PsxType]) |
| 314 | { |
| 315 | rcnts[3].cycle = Config.PsxType ? PSXCLK / 50 : PSXCLK / 60; |
| 316 | } |
| 317 | else |
| 318 | { |
| 319 | // clk / 50 / 314 ~= 2157.25 |
| 320 | // clk / 60 / 263 ~= 2146.31 |
| 321 | u32 mult = Config.PsxType ? 8836089 : 8791293; |
| 322 | rcnts[3].cycle = hsync_steps * mult >> 12; |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | void psxRcntUpdate() |
| 327 | { |
| 328 | u32 cycle, cycles_passed; |
| 329 | |
| 330 | cycle = psxRegs.cycle; |
| 331 | |
| 332 | // rcnt 0. |
| 333 | cycles_passed = cycle - rcnts[0].cycleStart; |
| 334 | while( cycles_passed >= rcnts[0].cycle ) |
| 335 | { |
| 336 | if (((rcnts[0].mode & 7) == (RcSyncModeEnable | Rc01UnblankReset) || |
| 337 | (rcnts[0].mode & 7) == (RcSyncModeEnable | Rc01UnblankReset2)) |
| 338 | && cycles_passed > lineCycles()) |
| 339 | { |
| 340 | u32 q = cycles_passed / (lineCycles() + 1u); |
| 341 | rcnts[0].cycleStart += q * lineCycles(); |
| 342 | break; |
| 343 | } |
| 344 | else |
| 345 | psxRcntReset( 0 ); |
| 346 | |
| 347 | cycles_passed = cycle - rcnts[0].cycleStart; |
| 348 | } |
| 349 | |
| 350 | // rcnt 1. |
| 351 | while( cycle - rcnts[1].cycleStart >= rcnts[1].cycle ) |
| 352 | { |
| 353 | psxRcntReset( 1 ); |
| 354 | } |
| 355 | |
| 356 | // rcnt 2. |
| 357 | while( cycle - rcnts[2].cycleStart >= rcnts[2].cycle ) |
| 358 | { |
| 359 | psxRcntReset( 2 ); |
| 360 | } |
| 361 | |
| 362 | // rcnt base. |
| 363 | if( cycle - rcnts[3].cycleStart >= rcnts[3].cycle ) |
| 364 | { |
| 365 | hSyncCount += hsync_steps; |
| 366 | |
| 367 | // VSync irq. |
| 368 | if( hSyncCount == VBlankStart ) |
| 369 | { |
| 370 | HW_GPU_STATUS &= SWAP32(~PSXGPU_LCF); |
| 371 | GPU_vBlank( 1, 0 ); |
| 372 | setIrq( 0x01 ); |
| 373 | |
| 374 | EmuUpdate(); |
| 375 | GPU_updateLace(); |
| 376 | |
| 377 | if( SPU_async ) |
| 378 | { |
| 379 | SPU_async( cycle, 1 ); |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | // Update lace. |
| 384 | if( hSyncCount >= HSyncTotal[Config.PsxType] ) |
| 385 | { |
| 386 | u32 status, field = 0; |
| 387 | rcnts[3].cycleStart += Config.PsxType ? PSXCLK / 50 : PSXCLK / 60; |
| 388 | hSyncCount = 0; |
| 389 | frame_counter++; |
| 390 | |
| 391 | gpuSyncPluginSR(); |
| 392 | status = SWAP32(HW_GPU_STATUS) | PSXGPU_FIELD; |
| 393 | if ((status & PSXGPU_ILACE_BITS) == PSXGPU_ILACE_BITS) { |
| 394 | field = frame_counter & 1; |
| 395 | status |= field << 31; |
| 396 | status ^= field << 13; |
| 397 | } |
| 398 | HW_GPU_STATUS = SWAP32(status); |
| 399 | GPU_vBlank(0, field); |
| 400 | |
| 401 | if ((rcnts[0].mode & 7) == (RcSyncModeEnable | Rc01UnblankReset) || |
| 402 | (rcnts[0].mode & 7) == (RcSyncModeEnable | Rc01UnblankReset2)) |
| 403 | { |
| 404 | rcnts[0].cycleStart = rcnts[3].cycleStart; |
| 405 | } |
| 406 | |
| 407 | if ((rcnts[1].mode & 7) == (RcSyncModeEnable | Rc01UnblankReset) || |
| 408 | (rcnts[1].mode & 7) == (RcSyncModeEnable | Rc01UnblankReset2)) |
| 409 | { |
| 410 | rcnts[1].cycleStart = rcnts[3].cycleStart; |
| 411 | } |
| 412 | else if (rcnts[1].mode & Rc1HSyncClock) |
| 413 | { |
| 414 | // adjust to remove the rounding error |
| 415 | _psxRcntWcount(1, (psxRegs.cycle - rcnts[1].cycleStart) / rcnts[1].rate); |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | scheduleRcntBase(); |
| 420 | } |
| 421 | |
| 422 | psxRcntSet(); |
| 423 | |
| 424 | #if 0 //ndef NDEBUG |
| 425 | DebugVSync(); |
| 426 | #endif |
| 427 | } |
| 428 | |
| 429 | /******************************************************************************/ |
| 430 | |
| 431 | void psxRcntWcount( u32 index, u32 value ) |
| 432 | { |
| 433 | verboseLog( 2, "[RCNT %i] wcount: %x\n", index, value ); |
| 434 | |
| 435 | _psxRcntWcount( index, value ); |
| 436 | psxRcntSet(); |
| 437 | } |
| 438 | |
| 439 | void psxRcntWmode( u32 index, u32 value ) |
| 440 | { |
| 441 | verboseLog( 1, "[RCNT %i] wmode: %x\n", index, value ); |
| 442 | |
| 443 | _psxRcntWmode( index, value ); |
| 444 | _psxRcntWcount( index, 0 ); |
| 445 | |
| 446 | rcnts[index].irqState = 0; |
| 447 | psxRcntSet(); |
| 448 | } |
| 449 | |
| 450 | void psxRcntWtarget( u32 index, u32 value ) |
| 451 | { |
| 452 | verboseLog( 1, "[RCNT %i] wtarget: %x\n", index, value ); |
| 453 | |
| 454 | rcnts[index].target = value; |
| 455 | |
| 456 | _psxRcntWcount( index, _psxRcntRcount( index ) ); |
| 457 | psxRcntSet(); |
| 458 | } |
| 459 | |
| 460 | /******************************************************************************/ |
| 461 | |
| 462 | u32 psxRcntRcount0() |
| 463 | { |
| 464 | u32 index = 0; |
| 465 | u32 count; |
| 466 | |
| 467 | if ((rcnts[0].mode & 7) == (RcSyncModeEnable | Rc01UnblankReset) || |
| 468 | (rcnts[0].mode & 7) == (RcSyncModeEnable | Rc01UnblankReset2)) |
| 469 | { |
| 470 | count = psxRegs.cycle - rcnts[index].cycleStart; |
| 471 | //count = ((16u * count) % (16u * PSXCLK / 60 / 263)) / 16u; |
| 472 | count = count % lineCycles(); |
| 473 | rcnts[index].cycleStart = psxRegs.cycle - count; |
| 474 | } |
| 475 | else |
| 476 | count = _psxRcntRcount( index ); |
| 477 | |
| 478 | verboseLog( 2, "[RCNT 0] rcount: %04x m: %04x\n", count, rcnts[index].mode); |
| 479 | |
| 480 | return count; |
| 481 | } |
| 482 | |
| 483 | u32 psxRcntRcount1() |
| 484 | { |
| 485 | u32 index = 1; |
| 486 | u32 count; |
| 487 | |
| 488 | count = _psxRcntRcount( index ); |
| 489 | |
| 490 | verboseLog( 2, "[RCNT 1] rcount: %04x m: %04x\n", count, rcnts[index].mode); |
| 491 | |
| 492 | return count; |
| 493 | } |
| 494 | |
| 495 | u32 psxRcntRcount2() |
| 496 | { |
| 497 | u32 index = 2; |
| 498 | u32 count; |
| 499 | |
| 500 | count = _psxRcntRcount( index ); |
| 501 | |
| 502 | verboseLog( 2, "[RCNT 2] rcount: %04x m: %04x\n", count, rcnts[index].mode); |
| 503 | |
| 504 | return count; |
| 505 | } |
| 506 | |
| 507 | u32 psxRcntRmode( u32 index ) |
| 508 | { |
| 509 | u16 mode; |
| 510 | |
| 511 | mode = rcnts[index].mode; |
| 512 | rcnts[index].mode &= 0xe7ff; |
| 513 | |
| 514 | verboseLog( 2, "[RCNT %i] rmode: %x\n", index, mode ); |
| 515 | |
| 516 | return mode; |
| 517 | } |
| 518 | |
| 519 | u32 psxRcntRtarget( u32 index ) |
| 520 | { |
| 521 | verboseLog( 2, "[RCNT %i] rtarget: %x\n", index, rcnts[index].target ); |
| 522 | |
| 523 | return rcnts[index].target; |
| 524 | } |
| 525 | |
| 526 | /******************************************************************************/ |
| 527 | |
| 528 | void psxRcntInit() |
| 529 | { |
| 530 | s32 i; |
| 531 | |
| 532 | // rcnt 0. |
| 533 | rcnts[0].rate = 1; |
| 534 | rcnts[0].irq = 0x10; |
| 535 | |
| 536 | // rcnt 1. |
| 537 | rcnts[1].rate = 1; |
| 538 | rcnts[1].irq = 0x20; |
| 539 | |
| 540 | // rcnt 2. |
| 541 | rcnts[2].rate = 1; |
| 542 | rcnts[2].irq = 0x40; |
| 543 | |
| 544 | // rcnt base. |
| 545 | rcnts[3].rate = 1; |
| 546 | |
| 547 | for( i = 0; i < CounterQuantity; ++i ) |
| 548 | { |
| 549 | _psxRcntWcount( i, 0 ); |
| 550 | } |
| 551 | |
| 552 | hSyncCount = 0; |
| 553 | hsync_steps = 1; |
| 554 | |
| 555 | scheduleRcntBase(); |
| 556 | psxRcntSet(); |
| 557 | } |
| 558 | |
| 559 | /******************************************************************************/ |
| 560 | |
| 561 | s32 psxRcntFreeze( void *f, s32 Mode ) |
| 562 | { |
| 563 | u32 spuSyncCount = 0; |
| 564 | u32 count; |
| 565 | s32 i; |
| 566 | |
| 567 | gzfreeze( &rcnts, sizeof(Rcnt) * CounterQuantity ); |
| 568 | gzfreeze( &hSyncCount, sizeof(hSyncCount) ); |
| 569 | gzfreeze( &spuSyncCount, sizeof(spuSyncCount) ); |
| 570 | gzfreeze( &psxNextCounter, sizeof(psxNextCounter) ); |
| 571 | gzfreeze( &psxNextsCounter, sizeof(psxNextsCounter) ); |
| 572 | |
| 573 | if (Mode == 0) |
| 574 | { |
| 575 | // don't trust things from a savestate |
| 576 | rcnts[3].rate = 1; |
| 577 | for( i = 0; i < CounterQuantity; ++i ) |
| 578 | { |
| 579 | _psxRcntWmode( i, rcnts[i].mode ); |
| 580 | count = (psxRegs.cycle - rcnts[i].cycleStart) / rcnts[i].rate; |
| 581 | _psxRcntWcount( i, count ); |
| 582 | } |
| 583 | scheduleRcntBase(); |
| 584 | psxRcntSet(); |
| 585 | } |
| 586 | |
| 587 | return 0; |
| 588 | } |
| 589 | |
| 590 | /******************************************************************************/ |
| 591 | // vim:ts=4:shiftwidth=4:expandtab |