kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
79 wiersze
1.6 KiB
C
79 wiersze
1.6 KiB
C
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/*
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* UAE - The Un*x Amiga Emulator
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*
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* Events
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*
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* (c) 1995 Bernd Schmidt
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*/
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/* This is tunable. 4 gives good results. */
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#ifdef LINUX_SOUND_SLOW_MACHINE
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#define cycles_per_instruction 8
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#else
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#define cycles_per_instruction 4
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#endif
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#undef DEFFERED_INT
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#if !defined(NO_FAST_BLITTER)
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#define DEFERRED_INT
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#endif
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extern unsigned long int cycles, nextevent, nextev_count;
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typedef void (*evfunc)(void);
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struct ev
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{
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int active;
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unsigned long int evtime, oldcycles;
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evfunc handler;
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};
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enum {
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ev_hsync, ev_copper, ev_cia,
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#ifdef DEFERRED_INT
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ev_deferint,
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#endif
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ev_max
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};
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extern struct ev eventtab[ev_max];
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static __inline__ void events_schedule(void)
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{
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int i;
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unsigned long int mintime = ~0L;
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nextevent = cycles + mintime;
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for(i = 0; i < ev_max; i++) {
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unsigned long int eventtime = eventtab[i].evtime + eventtab[i].oldcycles - cycles;
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if (eventtab[i].active && eventtime < mintime) {
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mintime = eventtime;
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nextevent = cycles + mintime;
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}
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}
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nextev_count = nextevent - cycles;
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}
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static __inline__ void do_cycles(void)
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{
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if (nextev_count <= cycles_per_instruction) {
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int j;
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for(j = 0; j < cycles_per_instruction; j++) {
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if (++cycles == nextevent) {
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unsigned long int old_nextevent = nextevent;
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int i;
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for(i = 0; i < ev_max; i++) {
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if (eventtab[i].active && (eventtab[i].evtime + eventtab[i].oldcycles) == old_nextevent) {
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(*eventtab[i].handler)();
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}
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}
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events_schedule();
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} else nextev_count--;
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}
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} else {
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nextev_count -= cycles_per_instruction;
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cycles += cycles_per_instruction;
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}
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}
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