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engines/alcachofa/camera.h

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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/>.
+ *
+ */
+
+#ifndef ALCACHOFA_CAMERA_H
+#define ALCACHOFA_CAMERA_H
+
+#include "alcachofa/common.h"
+#include "math/matrix4.h"
+
+namespace Alcachofa {
+
+class WalkingCharacter;
+class Process;
+struct Task;
+
+static constexpr const int16_t kBaseScale = 300;
+static constexpr const float kInvBaseScale = 1.0f / kBaseScale;
+
+class Camera {
+public:
+	inline Math::Angle rotation() const { return _cur._rotation; }
+	inline Math::Vector2d &shake() { return _shake; }
+	inline WalkingCharacter *followTarget() { return _followTarget; }
+
+	void update();
+	Math::Vector3d transform2Dto3D(Math::Vector3d v) const;
+	Math::Vector3d transform3Dto2D(Math::Vector3d v) const;
+	Common::Point transform3Dto2D(Common::Point p) const;
+	void resetRotationAndScale();
+	void setRoomBounds(Common::Point bgSize, int16 bgScale);
+	void setFollow(WalkingCharacter *target, bool catchUp = false);
+	void setPosition(Math::Vector2d v);
+	void setPosition(Math::Vector3d v);
+	void backup(uint slot);
+	void restore(uint slot);
+	void syncGame(Common::Serializer &s);
+
+	Task *lerpPos(Process &process,
+		Math::Vector2d targetPos,
+		int32 duration, EasingType easingType);
+	Task *lerpPos(Process &process,
+		Math::Vector3d targetPos,
+		int32 duration, EasingType easingType);
+	Task *lerpPosZ(Process &process,
+		float targetPosZ,
+		int32 duration, EasingType easingType);
+	Task *lerpScale(Process &process,
+		float targetScale,
+		int32 duration, EasingType easingType);
+	Task *lerpRotation(Process &process,
+		float targetRotation,
+		int32 duration, EasingType easingType);
+	Task *lerpPosScale(Process &process,
+		Math::Vector3d targetPos, float targetScale,
+		int32 duration, EasingType moveEasingType, EasingType scaleEasingType);
+	Task *waitToStop(Process &process);
+	Task *shake(Process &process, Math::Vector2d amplitude, Math::Vector2d frequency, int32 duration);
+
+private:
+	friend struct CamLerpTask;
+	friend struct CamLerpPosTask;
+	friend struct CamLerpScaleTask;
+	friend struct CamLerpPosScaleTask;
+	friend struct CamLerpRotationTask;
+	friend struct CamShakeTask;
+	friend struct CamWaitToStopTask;
+	friend struct CamSetInactiveAttributeTask;
+	Math::Vector3d setAppliedCenter(Math::Vector3d center);
+	void setupMatricesAround(Math::Vector3d center);
+	void updateFollowing(float deltaTime);
+
+	struct State {
+		Math::Vector3d _usedCenter = Math::Vector3d(512, 384, 0);
+		float
+			_scale = 1.0f,
+			_speed = 0.0f,
+			_maxSpeedFactor = 230.0f;
+		Math::Angle _rotation;
+		bool _isBraking = false;
+		bool _isFollowingTarget = false;
+
+		void syncGame(Common::Serializer &s);
+	};
+
+	static constexpr uint kStateBackupCount = 2;
+	State _cur, _backups[kStateBackupCount];
+	WalkingCharacter *_followTarget = nullptr;
+	uint32 _lastUpdateTime = 0;
+	bool _isChanging = false,
+		_catchUp = false;
+	float _roomScale = 1.0f;
+	Math::Vector2d
+		_roomMin = Math::Vector2d(-10000, -10000),
+		_roomMax = Math::Vector2d(10000, 10000),
+		_shake;
+	Math::Vector3d _appliedCenter;
+	Math::Matrix4
+		_mat3Dto2D,
+		_mat2Dto3D;
+};
+
+}
+
+#endif // ALCACHOFA_CAMERA_H