114 lines
2.1 KiB
C
114 lines
2.1 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <SDL.h>
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#include "CNFGRAPI.h"
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#include "SYSDEPNS.h"
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#include "UTIL/ENDIANAC.h"
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#include "UI/MYOSGLUE.h"
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#include "STRCONST.h"
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/* --- time, date, location --- */
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#define dbglog_TimeStuff (0 && dbglog_HAVE)
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uint32_t TrueEmulatedTime = 0;
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#define InvTimeDivPow 16
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#define InvTimeDiv (1 << InvTimeDivPow)
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#define InvTimeDivMask (InvTimeDiv - 1)
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#define InvTimeStep 1089590 /* 1000 / 60.14742 * InvTimeDiv */
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uint32_t LastTime;
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uint32_t NextIntTime;
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uint32_t NextFracTime;
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void IncrNextTime(void)
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{
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NextFracTime += InvTimeStep;
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NextIntTime += (NextFracTime >> InvTimeDivPow);
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NextFracTime &= InvTimeDivMask;
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}
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void InitNextTime(void)
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{
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NextIntTime = LastTime;
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NextFracTime = 0;
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IncrNextTime();
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}
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static uint32_t NewMacDateInSeconds;
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bool UpdateTrueEmulatedTime(void)
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{
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Uint32 LatestTime;
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int32_t TimeDiff;
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LatestTime = SDL_GetTicks();
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if (LatestTime != LastTime) {
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NewMacDateInSeconds = LatestTime / 1000;
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/* no date and time api in SDL */
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LastTime = LatestTime;
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TimeDiff = (LatestTime - NextIntTime);
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/* this should work even when time wraps */
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if (TimeDiff >= 0) {
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if (TimeDiff > 256) {
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/* emulation interrupted, forget it */
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++TrueEmulatedTime;
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InitNextTime();
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#if dbglog_TimeStuff
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dbglog_writelnNum("emulation interrupted",
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TrueEmulatedTime);
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#endif
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} else {
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do {
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++TrueEmulatedTime;
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IncrNextTime();
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TimeDiff = (LatestTime - NextIntTime);
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} while (TimeDiff >= 0);
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}
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return true;
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} else {
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if (TimeDiff < -256) {
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#if dbglog_TimeStuff
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dbglog_writeln("clock set back");
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#endif
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/* clock goofed if ever get here, reset */
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InitNextTime();
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}
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}
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}
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return false;
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}
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bool CheckDateTime(void)
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{
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if (CurMacDateInSeconds != NewMacDateInSeconds) {
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CurMacDateInSeconds = NewMacDateInSeconds;
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return true;
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} else {
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return false;
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}
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}
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void StartUpTimeAdjust(void)
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{
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LastTime = SDL_GetTicks();
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InitNextTime();
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}
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bool InitLocationDat(void)
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{
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LastTime = SDL_GetTicks();
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InitNextTime();
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NewMacDateInSeconds = LastTime / 1000;
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CurMacDateInSeconds = NewMacDateInSeconds;
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return true;
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}
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