CameraController.h

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/* Copyright (C) 2022 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. 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 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. 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 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#ifndef INCLUDED_CAMERACONTROLLER
#define INCLUDED_CAMERACONTROLLER
 
#include "graphics/ICameraController.h"
#include "graphics/SmoothedValue.h"
 
class CCameraController : public ICameraController
{
    NONCOPYABLE(CCameraController);
public:
    CCameraController(CCamera& camera);
    ~CCameraController() override;
 
    void LoadConfig() override;
 
    InReaction HandleEvent(const SDL_Event_* ev) override;
 
    CVector3D GetCameraPivot() const override;
    CVector3D GetCameraPosition() const override;
    CVector3D GetCameraRotation() const override;
    float GetCameraZoom() const override;
 
    void SetCamera(const CVector3D& pos, float rotX, float rotY, float zoom) override;
    void MoveCameraTarget(const CVector3D& target) override;
    void ResetCameraTarget(const CVector3D& target) override;
    void FollowEntity(entity_id_t entity, bool firstPerson) override;
    entity_id_t GetFollowedEntity() override;
 
    void Update(const float deltaRealTime) override;
    void SetViewport(const SViewPort& vp) override;
 
    bool GetConstrainCamera() const override
    {
        return m_ConstrainCamera;
    }
 
    void SetConstrainCamera(bool constrain) override
    {
        m_ConstrainCamera = constrain;
    }
 
private:
    CVector3D GetSmoothPivot(CCamera &camera) const;
    void ResetCameraAngleZoom();
    void SetupCameraMatrixSmooth(CMatrix3D* orientation);
    void SetupCameraMatrixSmoothRot(CMatrix3D* orientation);
    void SetupCameraMatrixNonSmooth(CMatrix3D* orientation);
    void FocusHeight(bool smooth);
 
    /**
     * Set projection of current camera using near, far, and FOV values
     */
    void SetCameraProjection();
 
    /**
    * Whether the camera movement should be constrained by min/max limits
    * and terrain avoidance.
    */
    bool m_ConstrainCamera;
 
    /**
    * Entity for the camera to follow, or INVALID_ENTITY if none.
    */
    entity_id_t m_FollowEntity;
 
    /**
    * Whether to follow FollowEntity in first-person mode.
    */
    bool m_FollowFirstPerson;
 
    // Settings
    float m_ViewScrollSpeed;
    float m_ViewScrollSpeedModifier;
    // How close the mouse pointer should be to a view edge to move the camera.
    int m_ViewScrollMouseDetectDistance;
    float m_ViewRotateXSpeed;
    float m_ViewRotateXMin;
    float m_ViewRotateXMax;
    float m_ViewRotateXDefault;
    float m_ViewRotateYSpeed;
    float m_ViewRotateYSpeedWheel;
    float m_ViewRotateYDefault;
    float m_ViewRotateSpeedModifier;
    float m_ViewDragSpeed;
    float m_ViewZoomSpeed;
    float m_ViewZoomSpeedWheel;
    float m_ViewZoomMin;
    float m_ViewZoomMax;
    float m_ViewZoomDefault;
    float m_ViewZoomSpeedModifier;
    float m_ViewFOV;
    float m_ViewNear;
    float m_ViewFar;
    float m_HeightSmoothness;
    float m_HeightMin;
 
    // Camera Controls State
    CSmoothedValue m_PosX;
    CSmoothedValue m_PosY;
    CSmoothedValue m_PosZ;
    CSmoothedValue m_Zoom;
    CSmoothedValue m_RotateX; // inclination around x axis (relative to camera)
    CSmoothedValue m_RotateY; // rotation around y (vertical) axis
};
 
#endif // INCLUDED_CAMERACONTROLLER