Initial commit

engines/pegasus/fader.cpp

@@ -0,0 +1,218 @@
+/* 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.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * 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 "pegasus/fader.h"
+#include "pegasus/pegasus.h"
+#include "pegasus/sound.h"
+#include "pegasus/util.h"
+
+namespace Pegasus {
+
+Fader::Fader() {
+	_currentValue = 0;
+	_currentFaderMove._numKnots = 0;
+}
+
+void Fader::setFaderValue(const int32 newValue) {
+	_currentValue = newValue;
+}
+
+bool Fader::initFaderMove(const FaderMoveSpec &spec) {
+	bool faderMoves = false;
+	int32 value = 0;
+
+	if (spec._numKnots > 0) {
+		stopFader();
+		value = spec._knots[0].knotValue;
+		TimeValue startTime = spec._knots[0].knotTime;
+
+		if (startTime != 0xffffffff) {
+			if (spec._numKnots > 1) {
+				TimeValue stopTime = spec._knots[spec._numKnots - 1].knotTime;
+
+				if (spec._faderScale > 0) {
+					if (stopTime > startTime) {
+						for (uint32 i = 1; i < spec._numKnots; ++i) {
+							if (spec._knots[i - 1].knotValue != spec._knots[i].knotValue) {
+								faderMoves = true;
+								break;
+							}
+						}
+
+						if (faderMoves)
+							_currentFaderMove = spec;
+					} else if (spec._knots[spec._numKnots - 1].knotValue != value) {
+						value = spec._knots[spec._numKnots - 1].knotValue;
+					}
+				}
+			}
+		}
+	}
+
+	setFaderValue(value);
+	return faderMoves;
+}
+
+void Fader::startFader(const FaderMoveSpec &spec) {
+	if (initFaderMove(spec)) {
+		setFlags(0);
+		setScale(spec._faderScale);
+		setSegment(spec._knots[0].knotTime, spec._knots[spec._numKnots - 1].knotTime);
+		setTime(spec._knots[0].knotTime);
+		start();
+	}
+}
+
+void Fader::startFaderSync(const FaderMoveSpec &spec) {
+	if (initFaderMove(spec)) {
+		setFlags(0);
+		setScale(spec._faderScale);
+		setSegment(spec._knots[0].knotTime, spec._knots[spec._numKnots - 1].knotTime);
+		setTime(spec._knots[0].knotTime);
+		start();
+
+		while (isFading()) {
+			InputDevice.pumpEvents();
+			g_vm->checkCallBacks();
+			useIdleTime();
+		}
+
+		// Once more, for good measure, to make sure that there are no boundary
+		// condition problems.
+		useIdleTime();
+		stopFader();
+	}
+}
+
+void Fader::loopFader(const FaderMoveSpec &spec) {
+	if (initFaderMove(spec)) {
+		setFlags(kLoopTimeBase);
+		setScale(spec._faderScale);
+		setSegment(spec._knots[0].knotTime, spec._knots[spec._numKnots - 1].knotTime);
+		setTime(spec._knots[0].knotTime);
+		start();
+	}
+}
+
+void Fader::stopFader() {
+	stop();
+}
+
+void Fader::pauseFader() {
+	stopFader();
+}
+
+void Fader::continueFader() {
+	if (getTime() < getStop())
+		start();
+}
+
+void Fader::timeChanged(const TimeValue newTime) {
+	if (_currentFaderMove._numKnots != 0) {
+		uint32 i;
+		for (i = 0; i < _currentFaderMove._numKnots; i++)
+			if (_currentFaderMove._knots[i].knotTime > newTime)
+				break;
+
+		int32 newValue;
+		if (i == 0)
+			newValue = _currentFaderMove._knots[0].knotValue;
+		else if (i == _currentFaderMove._numKnots)
+			newValue = _currentFaderMove._knots[i - 1].knotValue;
+		else
+			newValue = linearInterp(_currentFaderMove._knots[i - 1].knotTime, _currentFaderMove._knots[i].knotTime, newTime, _currentFaderMove._knots[i - 1].knotValue, _currentFaderMove._knots[i].knotValue);
+
+		if (newValue != _currentValue)
+			setFaderValue(newValue);
+	}
+}
+
+void FaderMoveSpec::makeOneKnotFaderSpec(const int32 knotValue) {
+	_numKnots = 1;
+	_knots[0].knotTime = 0;
+	_knots[0].knotValue = knotValue;
+}
+
+void FaderMoveSpec::makeTwoKnotFaderSpec(const TimeScale faderScale, const TimeValue time1, const int32 value1, const TimeValue time2, const int32 value2) {
+	_numKnots = 2;
+	_faderScale = faderScale;
+	_knots[0].knotTime = time1;
+	_knots[0].knotValue = value1;
+	_knots[1].knotTime = time2;
+	_knots[1].knotValue = value2;
+}
+
+void FaderMoveSpec::insertFaderKnot(const TimeValue knotTime, const int32 knotValue) {
+	if (_numKnots != kMaxFaderKnots) {
+		uint32 index;
+		for (index = 0; index < _numKnots; index++) {
+			if (knotTime == _knots[index].knotTime) {
+				_knots[index].knotValue = knotValue;
+				return;
+			} else if (knotTime < _knots[index].knotTime) {
+				break;
+			}
+		}
+
+		for (uint32 i = _numKnots; i > index; i--)
+			_knots[i] = _knots[i - 1];
+
+		_knots[index].knotTime = knotTime;
+		_knots[index].knotValue = knotValue;
+		_numKnots++;
+	}
+}
+
+void FaderAnimation::setFaderValue(const int32 newValue) {
+	if (getFaderValue() != newValue) {
+		Fader::setFaderValue(newValue);
+		triggerRedraw();
+	}
+}
+
+SoundFader::SoundFader() {
+	_sound = nullptr;
+	_masterVolume = 0xff;
+}
+
+void SoundFader::attachSound(Sound *sound) {
+	if (!sound && isFading())
+		stopFader();
+
+	_sound = sound;
+}
+
+void SoundFader::setFaderValue(const int32 newVolume) {
+	if (_sound)
+		_sound->setVolume((newVolume * _masterVolume) >> 8);
+
+	_currentValue = newVolume;
+}
+
+void SoundFader::setMasterVolume(const uint16 masterVolume) {
+	_masterVolume = masterVolume;
+	setFaderValue(getFaderValue());
+}
+
+} // End of namespace Pegasus