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PsxCounters.c

/*  Pcsx - Pc Psx Emulator
 *  Copyright (C) 1999-2003  Pcsx Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <string.h>

#include "PsxCommon.h"

static int cnts = 4;

static void psxRcntUpd(unsigned long index) {
      psxCounters[index].sCycle = psxRegs.cycle;
      if (((!(psxCounters[index].mode & 1)) || (index!=2)) &&
            psxCounters[index].mode & 0x30) {
            if (psxCounters[index].mode & 0x10) { // Interrupt on target
                  psxCounters[index].Cycle = ((psxCounters[index].target - psxCounters[index].count) * psxCounters[index].rate) / BIAS;
            } else { // Interrupt on 0xffff
                  psxCounters[index].Cycle = ((0xffff - psxCounters[index].count) * psxCounters[index].rate) / BIAS;
            }
      } else psxCounters[index].Cycle = 0xffffffff;
//    if (index == 2) SysPrintf("Cycle %x\n", psxCounters[index].Cycle);
}

static void psxRcntReset(unsigned long index) {
//    SysPrintf("psxRcntReset %x (mode=%x)\n", index, psxCounters[index].mode);
      psxCounters[index].count = 0;
      psxRcntUpd(index);

//    if (index == 2) SysPrintf("rcnt2 %x\n", psxCounters[index].mode);
      psxHu32ref(0x1070)|= SWAPu32(psxCounters[index].interrupt);
      psxRegs.interrupt|= 0x80000000;
      if (!(psxCounters[index].mode & 0x40)) { // Only 1 interrupt
            psxCounters[index].Cycle = 0xffffffff;
      } // else Continuos interrupt mode
}

static void psxRcntSet() {
      int i;

      psxNextCounter = 0x7fffffff;
      psxNextsCounter = psxRegs.cycle;

      for (i=0; i<cnts; i++) {
            s32 count;

            if (psxCounters[i].Cycle == 0xffffffff) continue;

            count = psxCounters[i].Cycle - (psxRegs.cycle - psxCounters[i].sCycle);

            if (count < 0) {
                  psxNextCounter = 0; break;
            }

            if (count < (s32)psxNextCounter) {
                  psxNextCounter = count;
            }
      }
}

void psxRcntInit() {

      memset(psxCounters, 0, sizeof(psxCounters));

      psxCounters[0].rate = 1; psxCounters[0].interrupt = 0x10;
      psxCounters[1].rate = 1; psxCounters[1].interrupt = 0x20;
      psxCounters[2].rate = 1; psxCounters[2].interrupt = 0x40;

      psxCounters[3].interrupt = 1;
      psxCounters[3].mode = 0x58; // The VSync counter mode
      psxCounters[3].target = 1;
      psxUpdateVSyncRate();

      if (SPU_async != NULL) {
            cnts = 5;

            psxCounters[4].rate = 768 * 64;
            psxCounters[4].target = 1;
            psxCounters[4].mode = 0x58;
      } else cnts = 4;

      psxRcntUpd(0); psxRcntUpd(1); psxRcntUpd(2); psxRcntUpd(3);
      psxRcntSet();
}

void psxUpdateVSyncRate() {
      if (Config.PsxType) // ntsc - 0 | pal - 1
           psxCounters[3].rate = (PSXCLK / 50);// / BIAS;
      else psxCounters[3].rate = (PSXCLK / 60);// / BIAS;
      psxCounters[3].rate-= (psxCounters[3].rate / 262) * 22;
      if (Config.VSyncWA) psxCounters[3].rate/= 2;
}

void psxUpdateVSyncRateEnd() {
      if (Config.PsxType) // ntsc - 0 | pal - 1
           psxCounters[3].rate = (PSXCLK / 50);// / BIAS;
      else psxCounters[3].rate = (PSXCLK / 60);// / BIAS;
      psxCounters[3].rate = (psxCounters[3].rate / 262) * 22;
      if (Config.VSyncWA) psxCounters[3].rate/= 2;
}

void psxRcntUpdate() {
      if ((psxRegs.cycle - psxCounters[3].sCycle) >= psxCounters[3].Cycle) {
            if (psxCounters[3].mode & 0x10000) { // VSync End (22 hsyncs)
                  psxCounters[3].mode&=~0x10000;
                  psxUpdateVSyncRate();
                  psxRcntUpd(3);
                  GPU_updateLace(); // updateGPU
                  SysUpdate();
#ifdef GTE_LOG
                  GTE_LOG("VSync\n");
#endif
            } else { // VSync Start (240 hsyncs) 
                  psxCounters[3].mode|= 0x10000;
                  psxUpdateVSyncRateEnd();
                  psxRcntUpd(3);
                  psxHu32ref(0x1070)|= SWAPu32(1);
                  psxRegs.interrupt|= 0x80000000;
            }
      }

      if ((psxRegs.cycle - psxCounters[0].sCycle) >= psxCounters[0].Cycle) {
            psxRcntReset(0);
      }

      if ((psxRegs.cycle - psxCounters[1].sCycle) >= psxCounters[1].Cycle) {
            psxRcntReset(1);
      }

      if ((psxRegs.cycle - psxCounters[2].sCycle) >= psxCounters[2].Cycle) {
            psxRcntReset(2);
      }

      if (cnts >= 5) {
            if ((psxRegs.cycle - psxCounters[4].sCycle) >= psxCounters[4].Cycle) {
                  SPU_async((psxRegs.cycle - psxCounters[4].sCycle) * BIAS);
                  psxRcntReset(4);
            }
      }

      psxRcntSet();
}

void psxRcntWcount(unsigned long index, unsigned long value) {
//    SysPrintf("writeCcount[%d] = %x\n", index, value);
//    PSXCPU_LOG("writeCcount[%d] = %x\n", index, value);
      psxCounters[index].count = value;
      psxRcntUpd(index);
      psxRcntSet();
}

void psxRcntWmode(unsigned long index, unsigned long value)  {
//    SysPrintf("writeCmode[%ld] = %lx\n", index, value);
      psxCounters[index].mode = value;
      psxCounters[index].count = 0;
      if(index == 0) {
            switch (value & 0x300) {
                  case 0x100:
                        psxCounters[index].rate = ((psxCounters[3].rate /** BIAS*/) / 386) / 262; // seems ok
                        break;
                  default:
                        psxCounters[index].rate = 1;
            }
      }
      else if(index == 1) {
            switch (value & 0x300) {
                  case 0x100:
                        psxCounters[index].rate = (psxCounters[3].rate /** BIAS*/) / 262; // seems ok
                        break;
                  default:
                        psxCounters[index].rate = 1;
            }
      }
      else if(index == 2) {
            switch (value & 0x300) {
                  case 0x200:
                        psxCounters[index].rate = 8; // 1/8 speed
                        break;
                  default:
                        psxCounters[index].rate = 1; // normal speed
            }
      }

      // Need to set a rate and target
      psxRcntUpd(index);
      psxRcntSet();
}

void psxRcntWtarget(unsigned long index, unsigned long value) {
//    SysPrintf("writeCtarget[%ld] = %lx\n", index, value);
      psxCounters[index].target = value;
      psxRcntUpd(index);
      psxRcntSet();
}

unsigned long psxRcntRcount(unsigned long index) {
      u32 ret;

//    if ((!(psxCounters[index].mode & 1)) || (index!=2)) {
            if (psxCounters[index].mode & 0x08) { // Wrap at target
                  if (Config.RCntFix) { // Parasite Eve 2
                        ret = (psxCounters[index].count + /*BIAS **/ ((psxRegs.cycle - psxCounters[index].sCycle) / psxCounters[index].rate)) & 0xffff;
                  } else {
                        ret = (psxCounters[index].count + BIAS * ((psxRegs.cycle - psxCounters[index].sCycle) / psxCounters[index].rate)) & 0xffff;
                  }
            } else { // Wrap at 0xffff
                  ret = (psxCounters[index].count + BIAS * (psxRegs.cycle / psxCounters[index].rate)) & 0xffff;
                  if (Config.RCntFix) { // Vandal Hearts 1/2
                        ret/= 16;
                  }
            }
//          return (psxCounters[index].count + BIAS * ((psxRegs.cycle - psxCounters[index].sCycle) / psxCounters[index].rate)) & 0xffff;
//    } else return 0;

//    SysPrintf("readCcount[%ld] = %lx (mode %lx, target %lx, cycle %lx)\n", index, ret, psxCounters[index].mode, psxCounters[index].target, psxRegs.cycle);

      return ret;
}

int psxRcntFreeze(gzFile f, int Mode) {
      char Unused[4096 - sizeof(psxCounter)];

      gzfreezel(psxCounters);
      gzfreezel(Unused);

      return 0;
}

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