Initial commit

engines/ultima/ultima8/world/camera_process.h

@@ -0,0 +1,128 @@
+/* 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/>.
+ *
+ */
+
+#ifndef ULTIMA8_WORLD_CAMERAPROCESS_H
+#define ULTIMA8_WORLD_CAMERAPROCESS_H
+
+#include "ultima/ultima8/kernel/process.h"
+#include "ultima/ultima8/usecode/intrinsics.h"
+#include "ultima/ultima8/misc/classtype.h"
+#include "ultima/ultima8/misc/point3.h"
+
+namespace Ultima {
+namespace Ultima8 {
+
+/**
+* The camera process. This works in 4 ways:
+*
+* It can be set to stay where it currently is
+* It can be set to follow an item.
+* It can be set to scroll to an item
+* It can be set to stay at a location
+*/
+class CameraProcess : public Process {
+public:
+	CameraProcess();
+	CameraProcess(uint16 itemnum);                // Follow item/Do nothing
+	CameraProcess(const Point3 &p);               // Goto location
+	CameraProcess(const Point3 &p, int32 time);   // Scroll to location
+
+	~CameraProcess() override;
+
+	ENABLE_RUNTIME_CLASSTYPE()
+
+	void run() override;
+
+	// You will notice that this isn't the same as how Item::GetLerped works
+	Point3 GetLerped(int32 factor, bool noupdate = false);
+
+	//! Find the roof above the camera.
+	//! \param factor Interpolation factor for this frame
+	//! \return 0 if no roof found, objid of roof if found
+	uint16 findRoof(int32 factor);
+
+	/**
+	 * Move the existing camera process to a new location.  If the current process is focused on
+	 * an item, remove that focus.
+	 *
+	 * This is not the same as setting a new process, because execution order will not change,
+	 * so other pending events will all happen before the fast area is updated
+	 */
+	void moveToLocation(int32 x, int32 y, int32 z);
+	void moveToLocation(const Point3 &p);
+
+	INTRINSIC(I_setCenterOn);
+	INTRINSIC(I_moveTo);
+	INTRINSIC(I_scrollTo);
+	INTRINSIC(I_startQuake);
+	INTRINSIC(I_stopQuake);
+	INTRINSIC(I_getCameraX);
+	INTRINSIC(I_getCameraY);
+	INTRINSIC(I_getCameraZ);
+
+	static Point3           GetCameraLocation();
+	static CameraProcess   *GetCameraProcess() {
+		return _camera;
+	}
+
+	/**
+	 * Set the current camera process. Adds process and returns PID.
+	 * The new process will go on the front of the process queue, so the fast area
+	 * will be updated before any other pending actions occur.
+	 */
+	static uint16           SetCameraProcess(CameraProcess *);
+	static void             ResetCameraProcess();
+
+	static void             SetEarthquake(int32 e) {
+		_earthquake = e;
+		if (!e)  _eqX = _eqY = 0;
+	}
+
+	/** Notify the Camera that the target item has moved */
+	void itemMoved();
+
+	void terminate() override;   // Terminate NOW!
+
+	bool loadData(Common::ReadStream *rs, uint32 version);
+	void saveData(Common::WriteStream *ws) override;
+
+	uint16 getTrackedItem() const {
+		return _itemNum;
+	}
+
+private:
+	Point3 _s;
+	Point3 _e;
+	int32 _time;
+	int32 _elapsed;
+	uint16 _itemNum;
+
+	int32 _lastFrameNum;
+
+	static CameraProcess *_camera;
+	static int32 _earthquake;
+	static int32 _eqX, _eqY;
+};
+
+} // End of namespace Ultima8
+} // End of namespace Ultima
+
+#endif