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engines/wintermute/base/particles/part_particle.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/particles/part_particle.h"
+#include "engines/wintermute/base/particles/part_emitter.h"
+#include "engines/wintermute/base/base_sprite.h"
+#include "engines/wintermute/base/base_game.h"
+#include "engines/wintermute/utils/utils.h"
+#include "engines/wintermute/platform_osystem.h"
+#include "engines/wintermute/dcgf.h"
+
+#include "common/str.h"
+
+namespace Wintermute {
+
+//////////////////////////////////////////////////////////////////////////
+PartParticle::PartParticle(BaseGame *inGame) : BaseClass(inGame) {
+	_pos = DXVector2(0.0f, 0.0f);
+	_posZ = 0.0f;
+	_velocity = DXVector2(0.0f, 0.0f);
+	_scale = 100.0f;
+	_sprite = nullptr;
+	_creationTime = 0;
+	_lifeTime = 0;
+	_isDead = true;
+	BasePlatform::setRectEmpty(&_border);
+
+	_state = PARTICLE_NORMAL;
+	_fadeStart = 0;
+	_fadeTime = 0;
+	_currentAlpha = 255;
+
+	_alpha1 = _alpha2 = 255;
+
+	_rotation = 0.0f;
+	_angVelocity = 0.0f;
+
+	_growthRate = 0.0f;
+	_exponentialGrowth = false;
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+PartParticle::~PartParticle() {
+	SAFE_DELETE(_sprite);
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool PartParticle::setSprite(const char *filename) {
+	if (_sprite && _sprite->_filename && _sprite->_filename[0] && scumm_stricmp(filename, _sprite->_filename) == 0) {
+		_sprite->reset();
+		return STATUS_OK;
+	}
+
+	SAFE_DELETE(_sprite);
+
+	SystemClassRegistry::getInstance()->_disabled = true;
+	_sprite = new BaseSprite(_game, _game);
+	if (_sprite && DID_SUCCEED(_sprite->loadFile(filename))) {
+		SystemClassRegistry::getInstance()->_disabled = false;
+		return STATUS_OK;
+	} else {
+		SAFE_DELETE(_sprite);
+		SystemClassRegistry::getInstance()->_disabled = false;
+		return STATUS_FAILED;
+	}
+
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool PartParticle::update(PartEmitter *emitter, uint32 currentTime, uint32 timerDelta) {
+	if (_state == PARTICLE_FADEIN) {
+		if (currentTime - _fadeStart >= (uint32)_fadeTime) {
+			_state = PARTICLE_NORMAL;
+			_currentAlpha = _alpha1;
+		} else {
+			_currentAlpha = (int32)(((float)currentTime - (float)_fadeStart) / (float)_fadeTime * _alpha1);
+		}
+
+		return STATUS_OK;
+	} else if (_state == PARTICLE_FADEOUT) {
+		if (currentTime - _fadeStart >= (uint32)_fadeTime) {
+			_isDead = true;
+			return STATUS_OK;
+		} else {
+			_currentAlpha = _fadeStartAlpha - (int32)(((float)currentTime - (float)_fadeStart) / (float)_fadeTime * _fadeStartAlpha);
+		}
+
+		return STATUS_OK;
+	} else {
+		// time is up
+		if (_lifeTime > 0) {
+			if (currentTime - _creationTime >= (uint32)_lifeTime) {
+				if (emitter->_fadeOutTime > 0) {
+					fadeOut(currentTime, emitter->_fadeOutTime);
+				} else {
+					_isDead = true;
+				}
+			}
+		}
+
+		// particle hit the border
+		if (!_isDead && !BasePlatform::isRectEmpty(&_border)) {
+			Common::Point32 p;
+			p.x = (int32)_pos._x;
+			p.y = (int32)_pos._y;
+			if (!BasePlatform::ptInRect(&_border, p)) {
+				fadeOut(currentTime, emitter->_fadeOutTime);
+			}
+		}
+		if (_state != PARTICLE_NORMAL) {
+			return STATUS_OK;
+		}
+
+		// update alpha
+		if (_lifeTime > 0) {
+			int age = (int)(currentTime - _creationTime);
+			int alphaDelta = (int)(_alpha2 - _alpha1);
+
+			_currentAlpha = _alpha1 + (int)(((float)alphaDelta / (float)_lifeTime * (float)age));
+		}
+
+		// update position
+		float elapsedTime = (float)timerDelta / 1000.f;
+
+		for (int32 i = 0; i < emitter->_forces.getSize(); i++) {
+			PartForce *force = emitter->_forces[i];
+			switch (force->_type) {
+			case PartForce::FORCE_GLOBAL:
+				_velocity += force->_direction * elapsedTime;
+				break;
+
+			case PartForce::FORCE_POINT: {
+				DXVector2 vecDist = force->_pos - _pos;
+				float dist = fabs(DXVec2Length(&vecDist));
+
+				dist = 100.0f / dist;
+
+				_velocity += force->_direction * dist * elapsedTime;
+			}
+			break;
+
+			default:
+				break;
+			}
+		}
+		_pos += _velocity * elapsedTime;
+
+		// update rotation
+		_rotation += _angVelocity * elapsedTime;
+		_rotation = BaseUtils::normalizeAngle(_rotation);
+
+		// update scale
+		if (_exponentialGrowth) {
+			_scale += _scale / 100.0f * _growthRate * elapsedTime;
+		} else {
+			_scale += _growthRate * elapsedTime;
+		}
+
+		if (_scale <= 0.0f) {
+			_isDead = true;
+		}
+
+
+		return STATUS_OK;
+	}
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool PartParticle::display(PartEmitter *emitter) {
+	if (!_sprite) {
+		return STATUS_FAILED;
+	}
+	if (_isDead) {
+		return STATUS_OK;
+	}
+
+	_sprite->getCurrentFrame();
+	return _sprite->display((int)_pos._x, (int)_pos._y,
+	                        nullptr,
+	                        _scale, _scale,
+	                        BYTETORGBA(255, 255, 255, _currentAlpha),
+	                        _rotation,
+	                        emitter->_blendMode);
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+bool PartParticle::fadeIn(uint32 currentTime, int fadeTime) {
+	_currentAlpha = 0;
+	_fadeStart = currentTime;
+	_fadeTime = fadeTime;
+	_state = PARTICLE_FADEIN;
+
+	return STATUS_OK;
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool PartParticle::fadeOut(uint32 currentTime, int fadeTime) {
+	//_currentAlpha = 255;
+	_fadeStartAlpha = _currentAlpha;
+	_fadeStart = currentTime;
+	_fadeTime = fadeTime;
+	_state = PARTICLE_FADEOUT;
+
+	return STATUS_OK;
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool PartParticle::persist(BasePersistenceManager *persistMgr) {
+	persistMgr->transferSint32(TMEMBER(_alpha1));
+	persistMgr->transferSint32(TMEMBER(_alpha2));
+	persistMgr->transferRect32(TMEMBER(_border));
+	persistMgr->transferVector2(TMEMBER(_pos));
+	persistMgr->transferFloat(TMEMBER(_posZ));
+	persistMgr->transferVector2(TMEMBER(_velocity));
+	persistMgr->transferFloat(TMEMBER(_scale));
+	persistMgr->transferUint32(TMEMBER(_creationTime));
+	persistMgr->transferSint32(TMEMBER(_lifeTime));
+	persistMgr->transferBool(TMEMBER(_isDead));
+	persistMgr->transferSint32(TMEMBER_INT(_state));
+	persistMgr->transferUint32(TMEMBER(_fadeStart));
+	persistMgr->transferSint32(TMEMBER(_fadeTime));
+	persistMgr->transferSint32(TMEMBER(_currentAlpha));
+	persistMgr->transferFloat(TMEMBER(_angVelocity));
+	persistMgr->transferFloat(TMEMBER(_rotation));
+	persistMgr->transferFloat(TMEMBER(_growthRate));
+	persistMgr->transferBool(TMEMBER(_exponentialGrowth));
+	persistMgr->transferSint32(TMEMBER(_fadeStartAlpha));
+
+	if (persistMgr->getIsSaving()) {
+		persistMgr->transferCharPtr(TMEMBER(_sprite->_filename));
+	} else {
+		char *filename;
+		persistMgr->transferCharPtr(TMEMBER(filename));
+		SystemClassRegistry::getInstance()->_disabled = true;
+		setSprite(filename);
+		SystemClassRegistry::getInstance()->_disabled = false;
+		SAFE_DELETE_ARRAY(filename);
+	}
+
+	// initialise to default
+	if (!persistMgr->getIsSaving()) {
+		_fadeStartAlpha = 0;
+	}
+
+	return STATUS_OK;
+}
+
+} // End of namespace Wintermute