mirror of
https://github.com/libretro/px68k-libretro.git
synced 2026-11-07 04:25:57 -10:00
libretroadmin
3bb967da25
Some notes to consider: - consider this wip. some vars might not be necessary. - only for C68K cpu core - minimally tested. it works on HD files, and multi-disks but have not tested on anything that switches to another disk yet or drive letter. - M3U/CMD platlist format is necessary to keep track of what content the state is for (filename for .statex tracking for example). Switching disk or switching to another game through ingame menu will break currently loaded state. - in core is use to run in content-less mode, the savestate will be universal or system state (PX68K.state) and will not be based on what content is loaded. - MIDI: Loading patchsets and other midi params from a state file is not implemented. It may take a while to refresh instruments sets until next time MIDI sends new data. Its also required that only load a state after selecting the correct MIDI device from the ingame menu. - requires new px68k_libretro.info file, with savestate support enabled
117 lines
2.4 KiB
C++
117 lines
2.4 KiB
C++
// ---------------------------------------------------------------------------
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// FM sound generator common timer module
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// Copyright (C) cisc 1998, 2000.
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// ---------------------------------------------------------------------------
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// $fmgen-Id: fmtimer.cpp,v 1.1 2000/09/08 13:45:56 cisc Exp $
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#include <stdint.h>
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#include "common.h"
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#include "fmtimer.h"
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using namespace FM;
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int Timer::StateAction(StateMem *sm, int load, int data_only)
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{
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SFORMAT StateRegs[] =
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{
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SFVAR(status),
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SFVAR(regtc),
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SFVARN(regta[0], "regta0"),
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SFVARN(regta[1], "regta1"),
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SFVAR(timera),
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SFVAR(timera_count),
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SFVAR(timerb),
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SFVAR(timerb_count),
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SFVAR(timer_step),
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SFEND
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};
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return PX68KSS_StateAction(sm, load, data_only, StateRegs, "TIMER", false);
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}
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// ---------------------------------------------------------------------------
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// タイマー制御
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//
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void Timer::SetTimerControl(uint32_t data)
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{
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uint32_t tmp = regtc ^ data;
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regtc = uint8_t(data);
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if (data & 0x10)
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ResetStatus(1);
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if (data & 0x20)
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ResetStatus(2);
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if (tmp & 0x01)
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timera_count = (data & 1) ? timera : 0;
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if (tmp & 0x02)
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timerb_count = (data & 2) ? timerb : 0;
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}
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// ---------------------------------------------------------------------------
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// タイマーA 周期設定
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//
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void Timer::SetTimerA(uint32_t addr, uint32_t data)
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{
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uint32_t tmp;
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regta[addr & 1] = uint8_t(data);
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tmp = (regta[0] << 2) + (regta[1] & 3);
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timera = (1024-tmp) * timer_step;
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}
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// ---------------------------------------------------------------------------
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// タイマーB 周期設定
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//
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void Timer::SetTimerB(uint32_t data)
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{
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timerb = (256-data) * timer_step;
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}
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// ---------------------------------------------------------------------------
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// タイマー時間処理
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//
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bool Timer::Count(int32_t us)
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{
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bool event = false;
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if (timera_count)
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{
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timera_count -= us << 16;
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if (timera_count <= 0)
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{
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event = true;
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TimerA();
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while (timera_count <= 0)
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timera_count += timera;
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if (regtc & 4)
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SetStatus(1);
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}
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}
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if (timerb_count)
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{
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timerb_count -= us << 12;
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if (timerb_count <= 0)
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{
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event = true;
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while (timerb_count <= 0)
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timerb_count += timerb;
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if (regtc & 8)
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SetStatus(2);
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}
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}
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return event;
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}
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// ---------------------------------------------------------------------------
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// タイマー基準値設定
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//
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void Timer::SetTimerBase(uint32_t clock)
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{
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timer_step = int32_t(1000000. * 65536 / clock);
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}
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