add native windows timers

2024-11-18 18:05:21 +00:00 · 2004-11-28 17:54:05 +00:00 · 2004-11-28 17:54:05 +00:00 · f8cd0231a0
commit f8cd0231a0
parent 9e96bd8241
1 changed files with 198 additions and 0 deletions
--- a/BasiliskII/src/Windows/timer_windows.cpp
+++ b/BasiliskII/src/Windows/timer_windows.cpp
@ -0,0 +1,198 @@
+/*
+ *  timer_windows.cpp - Time Manager emulation, Windows specific stuff
+ *
+ *  Basilisk II (C) 1997-2004 Christian Bauer
+ *
+ *  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 "sysdeps.h"
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+#include "main.h"
+#include "macos_util.h"
+#include "timer.h"
+
+#define DEBUG 0
+#include "debug.h"
+
+
+// Helper time functions
+#define MSECS2TICKS(MSECS) (((uint64)(MSECS) * frequency) / 1000)
+#define USECS2TICKS(USECS) (((uint64)(USECS) * frequency) / 1000000)
+#define TICKS2MSECS(TICKS) (((uint64)(TICKS) * 1000) / frequency)
+#define TICKS2USECS(TICKS) (((uint64)(TICKS) * 1000000) / frequency)
+
+// Global variables
+static uint32 frequency;				// CPU frequency in Hz (< 4 GHz)
+static tm_time_t mac_boot_ticks;
+static tm_time_t mac_1904_ticks;
+static tm_time_t mac_now_diff;
+
+
+/*
+ *  Initialize native Windows timers
+ */
+
+void SysTimerInit(void)
+{
+	D(bug("SysTimerInit\n"));
+
+	LARGE_INTEGER tt;
+	if (!QueryPerformanceFrequency(&tt)) {
+		ErrorAlert("No high resolution timers available\n");
+		QuitEmulator();
+	}
+	frequency = tt.LowPart;
+	D(bug(" frequency %d\n", frequency));
+
+	// mac_boot_ticks is 1.18 us since Basilisk II was started
+	QueryPerformanceCounter(&tt);
+	mac_boot_ticks = tt.QuadPart;
+
+	// mac_1904_ticks is 1.18 us since Mac time started 1904
+	mac_1904_ticks = time(NULL) * frequency;
+	mac_now_diff = mac_1904_ticks - mac_boot_ticks;
+}
+
+
+  /*
+ *  Return microseconds since boot (64 bit)
+ */
+
+void Microseconds(uint32 &hi, uint32 &lo)
+{
+	D(bug("Microseconds\n"));
+	LARGE_INTEGER tt;
+	QueryPerformanceCounter(&tt);
+	tt.QuadPart = TICKS2USECS(tt.QuadPart - mac_boot_ticks);
+	hi = tt.HighPart;
+	lo = tt.LowPart;
+}
+
+
+/*
+ *  Return local date/time in Mac format (seconds since 1.1.1904)
+ */
+
+uint32 TimerDateTime(void)
+{
+	return TimeToMacTime(time(NULL));
+}
+
+
+/*
+ *  Get current time
+ */
+
+void timer_current_time(tm_time_t &t)
+{
+	LARGE_INTEGER tt;
+	QueryPerformanceCounter(&tt);
+	t = tt.QuadPart + mac_now_diff;
+}
+
+
+/*
+ *  Add times
+ */
+
+void timer_add_time(tm_time_t &res, tm_time_t a, tm_time_t b)
+{
+	res = a + b;
+}
+
+
+/*
+ *  Subtract times
+ */
+
+void timer_sub_time(tm_time_t &res, tm_time_t a, tm_time_t b)
+{
+	res = a - b;
+}
+
+
+/*
+ *  Compare times (<0: a < b, =0: a = b, >0: a > b)
+ */
+
+int timer_cmp_time(tm_time_t a, tm_time_t b)
+{
+	tm_time_t r = a - b;
+	return r < 0 ? -1 : (r > 0 ? 1 : 0);
+}
+
+
+/*
+ *  Convert Mac time value (>0: microseconds, <0: microseconds) to tm_time_t
+ */
+
+void timer_mac2host_time(tm_time_t &res, int32 mactime)
+{
+	if (mactime > 0) {
+		// Time in milliseconds
+		res = MSECS2TICKS(mactime);
+	} else {
+		// Time in negative microseconds
+		res = USECS2TICKS(-mactime);
+	}
+}
+
+
+/*
+ *  Convert positive tm_time_t to Mac time value (>0: microseconds, <0: microseconds)
+ *  A negative input value for hosttime results in a zero return value
+ *  As long as the microseconds value fits in 32 bit, it must not be converted to milliseconds!
+ */
+
+int32 timer_host2mac_time(tm_time_t hosttime)
+{
+	if (hosttime < 0)
+		return 0;
+	else {
+		uint64 t = TICKS2MSECS(hosttime);
+		if (t > 0x7fffffff)
+			return t / 1000;	// Time in milliseconds
+		else
+			return -t;			// Time in negative microseconds
+	}
+}
+
+
+/*
+ *  Get current value of microsecond timer
+ */
+
+uint64 GetTicks_usec(void)
+{
+	LARGE_INTEGER tt;
+	QueryPerformanceCounter(&tt);
+	return TICKS2USECS(tt.QuadPart - mac_boot_ticks);
+}
+
+
+/*
+ *  Delay by specified number of microseconds (<1 second)
+ */
+
+void Delay_usec(uint32 usec)
+{
+	// FIXME: fortunately, Delay_usec() is generally used with
+	// millisecond resolution anyway
+	Sleep(usec / 1000);
+}