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engines/wintermute/base/base_fader.cpp

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+/* 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/>.
+ *
+ */
+
+/*
+ * This file is based on WME Lite.
+ * http://dead-code.org/redir.php?target=wmelite
+ * Copyright (c) 2011 Jan Nedoma
+ */
+
+#include "engines/wintermute/base/base_fader.h"
+#include "engines/wintermute/base/base_engine.h"
+#include "engines/wintermute/base/base_game.h"
+#include "engines/wintermute/base/gfx/base_renderer.h"
+#include "engines/wintermute/platform_osystem.h"
+
+#include "common/util.h"
+
+namespace Wintermute {
+
+//////////////////////////////////////////////////////////////////////
+// Construction/Destruction
+//////////////////////////////////////////////////////////////////////
+
+IMPLEMENT_PERSISTENT(BaseFader, false)
+
+//////////////////////////////////////////////////////////////////////////
+BaseFader::BaseFader(BaseGame *inGame) : BaseObject(inGame) {
+	_active = false;
+	_red = _green = _blue = 0;
+	_currentAlpha = 0x00;
+	_sourceAlpha = 0;
+	_targetAlpha = 0;
+	_duration = 1000;
+	_startTime = 0;
+	_system = false;
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+BaseFader::~BaseFader() {
+
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+bool BaseFader::update() {
+	if (!_active) {
+		return STATUS_OK;
+	}
+
+	int alphaDelta = _targetAlpha - _sourceAlpha;
+
+	uint32 time;
+
+	if (_system) {
+		time = BasePlatform::getTime() - _startTime;
+	} else {
+		time = _game->_timer - _startTime;
+	}
+
+	if (time >= _duration) {
+		_currentAlpha = _targetAlpha;
+	} else {
+		_currentAlpha = (byte)(_sourceAlpha + (float)time / (float)_duration * alphaDelta);
+	}
+	_currentAlpha = MIN((byte)255, MAX(_currentAlpha, (byte)0));
+
+	_ready = time >= _duration;
+	if (_ready && _currentAlpha == 0x00) {
+		_active = false;
+	}
+
+	return STATUS_OK;
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+bool BaseFader::display() {
+	if (!_active) {
+		return STATUS_OK;
+	}
+
+	if (_currentAlpha > 0x00) {
+		return _game->_renderer->fadeToColor(_red, _green, _blue, _currentAlpha);
+	}
+	return STATUS_OK;
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool BaseFader::deactivate() {
+	_active = false;
+	_ready = true;
+	return STATUS_OK;
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+bool BaseFader::fadeIn(uint32 sourceColor, uint32 duration, bool system) {
+	_ready = false;
+	_active = true;
+
+	_red   = RGBCOLGetR(sourceColor);
+	_green = RGBCOLGetG(sourceColor);
+	_blue  = RGBCOLGetB(sourceColor);
+
+	_sourceAlpha = RGBCOLGetA(sourceColor);
+	_targetAlpha = 0;
+
+	_duration = duration;
+	_system = system;
+
+	if (_system) {
+		_startTime = BasePlatform::getTime();
+	} else {
+		_startTime = _game->_timer;
+	}
+
+	return STATUS_OK;
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+bool BaseFader::fadeOut(uint32 targetColor, uint32 duration, bool system) {
+	_ready = false;
+	_active = true;
+
+	_red   = RGBCOLGetR(targetColor);
+	_green = RGBCOLGetG(targetColor);
+	_blue  = RGBCOLGetB(targetColor);
+
+	//_sourceAlpha = 0;
+	_sourceAlpha = _currentAlpha;
+	_targetAlpha = RGBCOLGetA(targetColor);
+
+	_duration = duration;
+	_system = system;
+
+	if (_system) {
+		_startTime = BasePlatform::getTime();
+	} else {
+		_startTime = _game->_timer;
+	}
+
+
+	return STATUS_OK;
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+uint32 BaseFader::getCurrentColor() {
+	return BYTETORGBA(_red, _green, _blue, _currentAlpha);
+}
+
+
+
+//////////////////////////////////////////////////////////////////////////
+bool BaseFader::persist(BasePersistenceManager *persistMgr) {
+	BaseObject::persist(persistMgr);
+
+	persistMgr->transferBool(TMEMBER(_active));
+	persistMgr->transferByte(TMEMBER(_blue));
+	persistMgr->transferByte(TMEMBER(_currentAlpha));
+	persistMgr->transferUint32(TMEMBER(_duration));
+	persistMgr->transferByte(TMEMBER(_green));
+	persistMgr->transferByte(TMEMBER(_red));
+	persistMgr->transferByte(TMEMBER(_sourceAlpha));
+	persistMgr->transferUint32(TMEMBER(_startTime));
+	persistMgr->transferByte(TMEMBER(_targetAlpha));
+	persistMgr->transferBool(TMEMBER(_system));
+
+	if (_system && !persistMgr->getIsSaving()) {
+		_startTime = 0;
+	}
+
+	return STATUS_OK;
+}
+
+} // End of namespace Wintermute