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add native windows timers
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198
BasiliskII/src/Windows/timer_windows.cpp
Executable file
198
BasiliskII/src/Windows/timer_windows.cpp
Executable file
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/*
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* timer_windows.cpp - Time Manager emulation, Windows specific stuff
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*
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* Basilisk II (C) 1997-2004 Christian Bauer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "sysdeps.h"
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include "main.h"
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#include "macos_util.h"
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#include "timer.h"
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#define DEBUG 0
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#include "debug.h"
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// Helper time functions
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#define MSECS2TICKS(MSECS) (((uint64)(MSECS) * frequency) / 1000)
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#define USECS2TICKS(USECS) (((uint64)(USECS) * frequency) / 1000000)
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#define TICKS2MSECS(TICKS) (((uint64)(TICKS) * 1000) / frequency)
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#define TICKS2USECS(TICKS) (((uint64)(TICKS) * 1000000) / frequency)
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// Global variables
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static uint32 frequency; // CPU frequency in Hz (< 4 GHz)
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static tm_time_t mac_boot_ticks;
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static tm_time_t mac_1904_ticks;
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static tm_time_t mac_now_diff;
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/*
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* Initialize native Windows timers
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*/
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void SysTimerInit(void)
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{
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D(bug("SysTimerInit\n"));
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LARGE_INTEGER tt;
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if (!QueryPerformanceFrequency(&tt)) {
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ErrorAlert("No high resolution timers available\n");
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QuitEmulator();
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}
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frequency = tt.LowPart;
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D(bug(" frequency %d\n", frequency));
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// mac_boot_ticks is 1.18 us since Basilisk II was started
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QueryPerformanceCounter(&tt);
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mac_boot_ticks = tt.QuadPart;
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// mac_1904_ticks is 1.18 us since Mac time started 1904
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mac_1904_ticks = time(NULL) * frequency;
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mac_now_diff = mac_1904_ticks - mac_boot_ticks;
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}
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/*
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* Return microseconds since boot (64 bit)
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*/
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void Microseconds(uint32 &hi, uint32 &lo)
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{
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D(bug("Microseconds\n"));
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LARGE_INTEGER tt;
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QueryPerformanceCounter(&tt);
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tt.QuadPart = TICKS2USECS(tt.QuadPart - mac_boot_ticks);
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hi = tt.HighPart;
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lo = tt.LowPart;
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}
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/*
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* Return local date/time in Mac format (seconds since 1.1.1904)
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*/
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uint32 TimerDateTime(void)
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{
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return TimeToMacTime(time(NULL));
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}
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/*
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* Get current time
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*/
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void timer_current_time(tm_time_t &t)
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{
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LARGE_INTEGER tt;
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QueryPerformanceCounter(&tt);
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t = tt.QuadPart + mac_now_diff;
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}
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/*
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* Add times
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*/
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void timer_add_time(tm_time_t &res, tm_time_t a, tm_time_t b)
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{
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res = a + b;
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}
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/*
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* Subtract times
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*/
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void timer_sub_time(tm_time_t &res, tm_time_t a, tm_time_t b)
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{
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res = a - b;
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}
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/*
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* Compare times (<0: a < b, =0: a = b, >0: a > b)
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*/
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int timer_cmp_time(tm_time_t a, tm_time_t b)
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{
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tm_time_t r = a - b;
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return r < 0 ? -1 : (r > 0 ? 1 : 0);
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}
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/*
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* Convert Mac time value (>0: microseconds, <0: microseconds) to tm_time_t
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*/
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void timer_mac2host_time(tm_time_t &res, int32 mactime)
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{
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if (mactime > 0) {
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// Time in milliseconds
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res = MSECS2TICKS(mactime);
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} else {
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// Time in negative microseconds
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res = USECS2TICKS(-mactime);
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}
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}
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/*
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* Convert positive tm_time_t to Mac time value (>0: microseconds, <0: microseconds)
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* A negative input value for hosttime results in a zero return value
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* As long as the microseconds value fits in 32 bit, it must not be converted to milliseconds!
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*/
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int32 timer_host2mac_time(tm_time_t hosttime)
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{
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if (hosttime < 0)
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return 0;
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else {
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uint64 t = TICKS2MSECS(hosttime);
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if (t > 0x7fffffff)
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return t / 1000; // Time in milliseconds
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else
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return -t; // Time in negative microseconds
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}
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}
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/*
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* Get current value of microsecond timer
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*/
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uint64 GetTicks_usec(void)
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{
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LARGE_INTEGER tt;
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QueryPerformanceCounter(&tt);
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return TICKS2USECS(tt.QuadPart - mac_boot_ticks);
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}
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/*
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* Delay by specified number of microseconds (<1 second)
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*/
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void Delay_usec(uint32 usec)
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{
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// FIXME: fortunately, Delay_usec() is generally used with
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// millisecond resolution anyway
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Sleep(usec / 1000);
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}
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