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/* Pcsx - Pc Psx Emulator
* Copyright (C) 1999-2002 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)) {
if (psxCounters[index].mode & 0x08) { // Count to target
psxCounters[index].Cycle = ((psxCounters[index].target - psxCounters[index].count) * psxCounters[index].rate) / BIAS;
}
else { // Count to 0xffff
psxCounters[index].Cycle = ((0xffff - psxCounters[index].count) * psxCounters[index].rate) / BIAS;
}
} else psxCounters[index].Cycle = 0xffffffff;
}
static void psxRcntReset(unsigned long index) {
psxCounters[index].count = 0;
psxRcntUpd(index);
if ((psxCounters[index].mode & 0x50) == 0x50) psxHu32(0x1070)|= psxCounters[index].interrupt;
}
static void psxRcntSet() {
int i;
psxNextCounter = 0x7fffffff;
psxNextsCounter = psxRegs.cycle;
for (i=0; i<cnts; i++) {
long count = psxCounters[i].Cycle - (psxRegs.cycle - psxCounters[i].sCycle);
if (count < 0) {
psxNextCounter = 0; break;
}
if (count < (long)psxNextCounter) {
psxNextCounter = count;
}
}
}
void psxRcntInit() {
memset(psxCounters, 0, sizeof(psxCounters));
psxCounters[0].rate = 1; psxCounters[0].interrupt = 16;
psxCounters[1].rate = 1; psxCounters[1].interrupt = 32;
psxCounters[2].rate = 1; psxCounters[2].interrupt = 64;
psxCounters[3].interrupt = 1;
psxCounters[3].mode = 0x58; // The VSync counter mode
psxCounters[3].target = 1;
UpdateVSyncRate();
if (SPU_update != NULL) {
cnts = 5;
if (Config.PsxType)
psxCounters[4].rate = (262 / 32) * 50; // pal
else
psxCounters[4].rate = (312 / 32) * 60; // ntsc
psxCounters[4].target = 1;
psxCounters[4].mode = 0x8;
} else if (SPU_async != NULL) {
cnts = 5;
psxCounters[4].rate = 768 * 64;
psxCounters[4].target = 1;
psxCounters[4].mode = 0x8;
} else cnts = 4;
psxRcntUpd(0); psxRcntUpd(1); psxRcntUpd(2); psxRcntUpd(3);
psxRcntSet();
}
void UpdateVSyncRate() {
if (Config.PsxType) // ntsc - 0 | pal - 1
psxCounters[3].rate = (PSXCLK / 50);// / BIAS;
else psxCounters[3].rate = (PSXCLK / 60);// / BIAS;
}
void psxRcntUpdate() {
if ((psxRegs.cycle - psxCounters[3].sCycle) >= psxCounters[3].Cycle) {
psxRcntReset(3);
GPU_updateLace(); // updateGPU
SysUpdate();
#ifdef GTE_LOG
GTE_LOG("VSync\n");
#endif
}
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) {
if (SPU_update != NULL)
SPU_update();
if (SPU_async != NULL)
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;
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) {
// if ((!(psxCounters[index].mode & 1)) || (index!=2)) {
return (psxCounters[index].count + BIAS * (psxRegs.cycle - psxCounters[index].sCycle) / psxCounters[index].rate) & 0xffff;
// } else return 0;
}
int psxRcntFreeze(gzFile f, int Mode) {
char Unused[4096 - sizeof(psxCounter)];
gzfreezel(psxCounters);
gzfreezel(Unused);
return 0;
}
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