Initial commit

engines/zvision/core/clock.cpp

@@ -0,0 +1,65 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "common/scummsys.h"
+#include "common/system.h"
+#include "zvision/core/clock.h"
+
+namespace ZVision {
+
+Clock::Clock(OSystem *system)
+	: _system(system),
+	  _lastTime(system->getMillis()),
+	  _deltaTime(0),
+	  _pausedTime(0),
+	  _paused(false) {
+}
+
+void Clock::update() {
+	uint32 currentTime = _system->getMillis();
+
+	_deltaTime = (currentTime - _lastTime);
+	if (_paused) {
+		_deltaTime -= (currentTime - _pausedTime);
+	}
+
+	if (_deltaTime < 0) {
+		_deltaTime = 0;
+	}
+
+	_lastTime = currentTime;
+}
+
+void Clock::start() {
+	if (_paused) {
+		_lastTime = _system->getMillis();
+		_paused = false;
+	}
+}
+
+void Clock::stop() {
+	if (!_paused) {
+		_pausedTime = _system->getMillis();
+		_paused = true;
+	}
+}
+
+} // End of namespace ZVision