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engines/ultima/ultima8/world/snap_process.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/>.
+ *
+ */
+
+#include "common/config-manager.h"
+
+#include "ultima/ultima8/world/snap_process.h"
+#include "ultima/ultima8/world/get_object.h"
+#include "ultima/ultima8/world/actors/actor.h"
+#include "ultima/ultima8/world/camera_process.h"
+#include "ultima/ultima8/ultima8.h"
+
+namespace Ultima {
+namespace Ultima8 {
+
+
+SnapProcess *SnapProcess::_instance = nullptr;
+
+DEFINE_RUNTIME_CLASSTYPE_CODE(SnapProcess)
+
+SnapProcess::SnapProcess() : Process(), _currentSnapEgg(0) {
+	_instance = this;
+	_type = 1; // persistent
+}
+
+SnapProcess::~SnapProcess() {
+	if (_instance == this)
+		_instance = nullptr;
+}
+
+void SnapProcess::run() {
+	bool snap_to_player = ConfMan.getBool("camera_on_player");
+	bool in_stasis = Ultima8Engine::get_instance()->isAvatarInStasis();
+
+	// For cut scenes and remote cameras (when in stasis),
+	// we should snap to the right egg - not to the player.
+	// Snapping to player resumes once stasis is done.
+	if (snap_to_player && !in_stasis) {
+		const Actor *controlled = getControlledActor();
+		if (controlled) {
+			Point3 pt = controlled->getCentre();
+			if (pt.x > 0 || pt.y > 0) {
+				_currentSnapEgg = 0;
+				CameraProcess *camera = CameraProcess::GetCameraProcess();
+				if (camera->getItemNum() != controlled->getObjId())
+					CameraProcess::SetCameraProcess(new CameraProcess(pt));
+			}
+		}
+	} else {
+		if (!_currentSnapEgg || !isNpcInRangeOfCurrentEgg()) {
+			updateCurrentEgg();
+		}
+	}
+}
+
+void SnapProcess::addEgg(Item *item) {
+	assert(item);
+	ObjId id = item->getObjId();
+	for (const auto &eggId : _snapEggs) {
+		if (eggId == id)
+			return;
+	}
+	_snapEggs.push_back(id);
+}
+
+void SnapProcess::updateCurrentEgg() {
+	// Check that we have something to snap to..
+	if (!_currentSnapEgg && !_snapEggs.size())
+		return;
+
+	const Actor *a = getControlledActor();
+
+	if (!a)
+		return;
+
+	int32 axd, ayd, azd;
+	Point3 pta = a->getLocation();
+	a->getFootpadWorld(axd, ayd, azd);
+	Common::Rect32 arect(pta.x, pta.y, pta.x + axd, pta.y + ayd);
+
+	for (const auto &eggId : _snapEggs) {
+		const Item *egg = getItem(eggId);
+		if (!egg)
+			continue;
+		Common::Rect32 r;
+		Point3 pte = egg->getLocation();
+		getSnapEggRange(egg, r);
+		if (r.intersects(arect) && (pta.z <= pte.z + 0x30 && pta.z >= pte.z - 0x30)) {
+			_currentSnapEgg = eggId;
+			_currentSnapEggRange = r;
+			CameraProcess::SetCameraProcess(new CameraProcess(_currentSnapEgg));
+		}
+	}
+}
+
+void SnapProcess::removeEgg(Item *item) {
+	assert(item);
+	ObjId id = item->getObjId();
+	for (Std::list<ObjId>::iterator iter = _snapEggs.begin();
+		 iter != _snapEggs.end(); iter++) {
+		if (*iter == id) {
+			iter = _snapEggs.erase(iter);
+		}
+	}
+	if (id == _currentSnapEgg) {
+		_currentSnapEgg = 0;
+		_currentSnapEggRange = Common::Rect32();
+	}
+}
+
+void SnapProcess::clearEggs() {
+	_snapEggs.clear();
+	_currentSnapEgg = 0;
+	_currentSnapEggRange = Common::Rect32();
+}
+
+
+bool SnapProcess::isNpcInRangeOfCurrentEgg() const {
+	if (!_currentSnapEgg)
+		return false;
+
+	const Actor *a = getControlledActor();
+	const Item *currentegg = getItem(_currentSnapEgg);
+
+	if (!a || !currentegg)
+		return false;
+
+	int32 axd, ayd, azd;
+	Point3 pta = a->getLocation();
+	a->getFootpadWorld(axd, ayd, azd);
+	Point3 pte = currentegg->getLocation();
+
+	Common::Rect32 arect(pta.x, pta.y, pta.x + axd, pta.y + ayd);
+
+	if (!_currentSnapEggRange.intersects(arect))
+		return false;
+	if (pta.z > pte.z + 0x30 || pta.z < pte.z - 0x30)
+		return false;
+
+	return true;
+}
+
+void SnapProcess::getSnapEggRange(const Item *item, Common::Rect32 &rect) const {
+	assert(item);
+	uint16 qhi = ((item->getQuality() >> 8) & 0xff);
+	// Interpreting the values as *signed* char here is deliberate.
+	int32 xoff = static_cast<int8>(item->getMapNum()) * 0x0020;
+	int32 yoff = static_cast<int8>(item->getNpcNum()) * 0x0020;
+	int32 xrange = (qhi >> 4) * 0x20;
+	int32 yrange = (qhi & 0xf) * 0x20;
+
+	Point3 pt = item->getLocation();
+
+	rect.left = pt.x - xrange + xoff;
+	rect.top = pt.y - yrange + yoff;
+	rect.setWidth(xrange * 2);
+	rect.setHeight(yrange * 2);
+}
+
+void SnapProcess::saveData(Common::WriteStream *ws) {
+	Process::saveData(ws);
+
+	ws->writeUint16LE(_currentSnapEgg);
+	ws->writeUint16LE(_snapEggs.size());
+	for (const auto &eggId : _snapEggs) {
+		ws->writeUint16LE(eggId);
+	}
+}
+
+bool SnapProcess::loadData(Common::ReadStream *rs, uint32 version) {
+	if (!Process::loadData(rs, version)) return false;
+
+	_currentSnapEgg = rs->readUint16LE();
+	uint16 numeggs = rs->readUint16LE();
+	for (int i = 0; i < numeggs; i++) {
+		_snapEggs.push_back(rs->readUint16LE());
+	}
+
+	_type = 1; // should be persistent but older savegames may not know that.
+
+	return true;
+}
+
+SnapProcess *SnapProcess::get_instance() {
+	return _instance;
+}
+
+
+} // End of namespace Ultima8
+} // End of namespace Ultima