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Diffstat (limited to 'engines/pegasus/fader.cpp')
| -rw-r--r-- | engines/pegasus/fader.cpp | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/engines/pegasus/fader.cpp b/engines/pegasus/fader.cpp new file mode 100644 index 0000000000..77ad2cbe4e --- /dev/null +++ b/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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + */ + +#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()) { + ((PegasusEngine *)g_engine)->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 = 0; + _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 |