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Copyright (C) 1998-2001 by Jorrit Tyberghein
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __CS_IENGINE_CAMERA_H__
#define __CS_IENGINE_CAMERA_H__
/** \file
* Camera object
*/
/**
* \addtogroup engine3d_views
* @{ */
#include "csgeom/matrix4.h"
#include "csutil/scf.h"
#include "csgeom/matrix4.h"
#define CS_VEC_FORWARD csVector3(0,0,1)
#define CS_VEC_BACKWARD csVector3(0,0,-1)
#define CS_VEC_RIGHT csVector3(1,0,0)
#define CS_VEC_LEFT csVector3(-1,0,0)
#define CS_VEC_UP csVector3(0,1,0)
#define CS_VEC_DOWN csVector3(0,-1,0)
#define CS_VEC_ROT_RIGHT csVector3(0,1,0)
#define CS_VEC_ROT_LEFT csVector3(0,-1,0)
#define CS_VEC_TILT_RIGHT (-csVector3(0,0,1))
#define CS_VEC_TILT_LEFT (-csVector3(0,0,-1))
#define CS_VEC_TILT_UP (-csVector3(1,0,0))
#define CS_VEC_TILT_DOWN (-csVector3(-1,0,0))
class csOrthoTransform;
class csPlane3;
class csVector2;
class csVector3;
struct iSector;
struct iCamera;
struct iSceneNode;
/**
* Implement this interface if you are interested in learning when
* the camera changes sector or moves.
*
* This callback is used by:
* - iCamera
*/
struct iCameraListener : public virtual iBase
{
SCF_INTERFACE (iCameraListener, 0, 0, 1);
/// Fired when the sector changes.
virtual void NewSector (iCamera* camera, iSector* sector) = 0;
/// Fired when the camera moves.
virtual void CameraMoved (iCamera* camera) = 0;
};
#include "csutil/deprecated_warn_off.h"
/**
* Implement this interface if you are interested in learning when
* the camera changes sector.
*
* This callback is used by:
* - iCamera
*/
struct CS_DEPRECATED_TYPE_MSG("Use iCameraListener instead")
iCameraSectorListener : public iCameraListener
{
SCF_INTERFACE (iCameraSectorListener, 1, 0, 0);
/// Fired when the sector changes.
virtual void NewSector (iCamera* camera, iSector* sector) = 0;
// Make it compile.
void CameraMoved (iCamera* camera) {}
};
#include "csutil/deprecated_warn_on.h"
/**
* Camera class. This class represents camera objects which can be used to
* render a world in the engine. A camera has the following properties:
* - Home sector: The sector in which rendering starts.
* - Transformation: This is an orthonormal transformation which is applied
* to all rendered objects to move them from world space to camera space.
* It is the mathematical representation of position and direction of the
* camera. The position should be inside the home sector.
* - Field of View: Controls the size on screen of the rendered objects and
* can be used for zooming effects. The FOV can be given either in pixels
* or as an angle in degrees.
* - Shift amount: The projection center in screen coordinates.
* - Mirrored Flag: Should be set to true if the transformation is mirrored.
* - Far Plane: A distant plane that is orthogonal to the view direction. It
* is used to clip away all objects that are farther away than a certain
* distance, usually to improve rendering speed.
* - Camera number: An identifier for a camera transformation, used
* internally in the engine to detect outdated vertex buffers.
* - Only Portals Flag: If this is true then no collisions are detected for
* camera movement except for portals.
*
* Main creators of instances implementing this interface:
* - iEngine::CreateCamera()
* - csView
*
* Main ways to get pointers to this interface:
* - iView::GetCamera()
*
* Main users of this interface:
* - csView
* - iView
*/
struct iCamera : public virtual iBase
{
SCF_INTERFACE(iCamera, 3,0,0);
/**
* Create a clone of this camera. Note that the array of listeners
* is not cloned.
*/
virtual csPtr<iCamera> Clone () const = 0;
/**
* Get the scene node that this object represents.
* \todo iCamera doesn't yet support iMovable so scene nodes are not
* properly working yet.
*/
virtual iSceneNode* QuerySceneNode () = 0;
/**
* Return the FOV (field of view) in pixels
* \deprecated Deprecated in 1.3. Use iPerspectiveCamera instead
*/
CS_DEPRECATED_METHOD_MSG("Use iPerspectiveCamera instead")
virtual int GetFOV () const = 0;
/**
* Return the inverse flield of view (1/FOV) in pixels
* \deprecated Deprecated in 1.3. Use iPerspectiveCamera instead
*/
CS_DEPRECATED_METHOD_MSG("Use iPerspectiveCamera instead")
virtual float GetInvFOV () const = 0;
/**
* Return the FOV (field of view) in degrees.
* \deprecated Deprecated in 1.3. Use iPerspectiveCamera instead
*/
CS_DEPRECATED_METHOD_MSG("Use iPerspectiveCamera instead")
virtual float GetFOVAngle () const = 0;
/**
* Set the FOV in pixels. 'fov' is the desired FOV in pixels. 'width' is
* the display width, also in pixels.
* \deprecated Deprecated in 1.3. Use iPerspectiveCamera instead
*/
CS_DEPRECATED_METHOD_MSG("Use iPerspectiveCamera instead")
virtual void SetFOV (int fov, int width) = 0;
/**
* Set the FOV in degrees. 'fov' is the desired FOV in degrees. 'width' is
* the display width in pixels.
* \deprecated Deprecated in 1.3. Use iPerspectiveCamera instead
*/
CS_DEPRECATED_METHOD_MSG("Use iPerspectiveCamera instead")
virtual void SetFOVAngle (float fov, int width) = 0;
/**
* Get the X shift amount. The parameter specified the desired X coordinate
* on screen of the projection center of the camera.
* \deprecated Deprecated in 1.3. Use iPerspectiveCamera instead
*/
CS_DEPRECATED_METHOD_MSG("Use iPerspectiveCamera instead")
virtual float GetShiftX () const = 0;
/**
* Get the Y shift amount. The parameter specified the desired Y coordinate
* on screen of the projection center of the camera.
* \deprecated Deprecated in 1.3. Use iPerspectiveCamera instead
*/
CS_DEPRECATED_METHOD_MSG("Use iPerspectiveCamera instead")
virtual float GetShiftY () const = 0;
/**
* Set the shift amount. The parameter specified the desired projection
* center of the camera on screen.
* \deprecated Deprecated in 1.3. Use iPerspectiveCamera instead
*/
CS_DEPRECATED_METHOD_MSG("Use iPerspectiveCamera instead")
virtual void SetPerspectiveCenter (float x, float y) = 0;
/**
* Get the transform corresponding to this camera. In this transform,
* 'other' is world space and 'this' is camera space.
* WARNING! It is illegal to directly assign to the given transform
* in order to modify it. To change the entire transform you have
* to use SetTransform(). Note that it is legal to modify the
* returned transform otherwise. Just do not assign to it.
*/
virtual csOrthoTransform& GetTransform () = 0;
/// 'const' version of GetTransform ()
virtual const csOrthoTransform& GetTransform () const = 0;
/**
* Set the transform corresponding to this camera. In this transform,
* 'other' is world space and 'this' is camera space.
*/
virtual void SetTransform (const csOrthoTransform& tr) = 0;
/**
* Moves the camera a relative amount in world coordinates.
* \warning The \a cd parameter is not used
*/
virtual void MoveWorld (const csVector3& v, bool cd = true) = 0;
/**
* Moves the camera a relative amount in camera coordinates.
* \warning The \a cd parameter is not used
*/
virtual void Move (const csVector3& v, bool cd = true) = 0;
/**
* Moves the camera a relative amount in world coordinates,
* ignoring portals and walls. This is used by the wireframe
* class. In general this is useful by any camera model that
* doesn't want to restrict its movement by portals and
* sector boundaries.
*/
virtual void MoveWorldUnrestricted (const csVector3& v) = 0;
/**
* Moves the camera a relative amount in camera coordinates,
* ignoring portals and walls. This is used by the wireframe
* class. In general this is useful by any camera model that
* doesn't want to restrict its movement by portals and
* sector boundaries.
*/
virtual void MoveUnrestricted (const csVector3& v) = 0;
/// Get the current sector.
virtual iSector* GetSector () const = 0;
/// Move to another sector.
virtual void SetSector (iSector*) = 0;
/**
* Eliminate roundoff error by snapping the camera orientation to a
* grid of density n
*/
CS_DEPRECATED_METHOD_MSG("Don't use it anymore")
virtual void Correct (int n) = 0;
/// Return true if space is mirrored.
virtual bool IsMirrored () const = 0;
/// Set mirrored state.
virtual void SetMirrored (bool m) = 0;
/**
* Get the 3D far plane that should be used to clip all geometry.
* If this function returns 0 no far clipping is required.
* Otherwise it must be used to clip the object before
* drawing.
*/
virtual csPlane3* GetFarPlane () const = 0;
/**
* Set the 3D far plane used to clip all geometry.
* If the pointer is 0 then far plane clipping will be disabled.
* Otherwise it will be enabled and the plane will be copied (so you
* can free or reuse the pointer you give here). Note that the far-plane
* will cull away geometry which is on the negative side of the plane
* (with csPlane3::Classify() function).
*/
virtual void SetFarPlane (csPlane3* fp) = 0;
/**
* Get the camera number. This number is changed for every new camera
* instance and it is also updated whenever the camera transformation
* changes. This number can be used to cache camera vertex arrays, for
* example.
*/
virtual long GetCameraNumber () const = 0;
/// Calculate perspective corrected point for this camera.
virtual csVector2 Perspective (const csVector3& v) const = 0;
/// Calculate inverse perspective corrected point for this camera.
virtual csVector3 InvPerspective (const csVector2& p, float z) const = 0;
/**
* If the hit-only-portals flag is true then only portals will be
* checked with the 'MoveWorld()' function. This is a lot faster
* but it does mean that you will have to do collision detection with
* non-portal polygons using another technique. The default for this
* flag is true.
*/
virtual void OnlyPortals (bool hop) = 0;
/// Get the hit-only-portals flag.
virtual bool GetOnlyPortals () = 0;
#include "csutil/deprecated_warn_off.h"
/// Add a listener to this camera.
CS_DEPRECATED_METHOD_MSG("Use iCameraListener instead")
virtual void AddCameraSectorListener (iCameraSectorListener* listener) = 0;
/// Remove a listener from this camera.
CS_DEPRECATED_METHOD_MSG("Use iCameraListener instead")
virtual void RemoveCameraSectorListener (iCameraSectorListener* listener) = 0;
#include "csutil/deprecated_warn_on.h"
/// Add a listener to this camera.
virtual void AddCameraListener (iCameraListener* listener) = 0;
/// Remove a listener from this camera.
virtual void RemoveCameraListener (iCameraListener* listener) = 0;
/// Get the projection matrix for this camera
virtual const CS::Math::Matrix4& GetProjectionMatrix () = 0;
/**
* Return the planes limiting the visible volume (as specified by the
* projection). The returned planes are in camera space.
*/
virtual const csPlane3* GetVisibleVolume (uint32& mask) = 0;
/// Set the size of the viewport this camera is associated with.
virtual void SetViewportSize (int width, int height) = 0;
/// Get the inverse projection matrix for this camera
virtual const CS::Math::Matrix4& GetInvProjectionMatrix () = 0;
};
/**
* An implementation of iCamera that renders a world with a classical
* perspective.
*
* Main creators of instances implementing this interface:
* - iEngine::CreatePerspectiveCamera()
*
* Main ways to get pointers to this interface:
* - iView::GetPerspectiveCamera()
*/
struct iPerspectiveCamera : public virtual iBase
{
SCF_INTERFACE(iPerspectiveCamera, 1, 0, 1);
/// Get the iCamera interface for this camera.
virtual iCamera* GetCamera() = 0;
/// Return the normalized FOV (field of view)
virtual float GetFOV () const = 0;
/// Return the inverse of normalized field of view (1/FOV)
virtual float GetInvFOV () const = 0;
/// Return the FOV (field of view) in degrees.
virtual float GetFOVAngle () const = 0;
/**
* Set the FOV. \a fov is the desired FOV in normalized screen coordinates.
* \a width is the display width, also normalized.
*/
virtual void SetFOV (float fov, float width) = 0;
/**
* Set the FOV in degrees. \a fov is the desired FOV in degrees. \a width is
* the display width in normalized screen coordinates.
*/
virtual void SetFOVAngle (float fov, float width) = 0;
/**
* Get the X shift amount. The parameter specified the desired X coordinate
* on the normalized screen of the projection center of the camera.
*/
virtual float GetShiftX () const = 0;
/**
* Get the Y shift amount. The parameter specified the desired Y coordinate
* on the normalized screen of the projection center of the camera.
*/
virtual float GetShiftY () const = 0;
/**
* Set the shift amount. The parameter specified the desired projection
* center of the camera on the normalized screen.
*/
virtual void SetPerspectiveCenter (float x, float y) = 0;
/**
* Get the near clip distance of this camera.
* Higher clip distances increases the possibility that the camera may look
* "inside" some geometry, however, it also provides higher depth value
* precision - especially for large scenes this can prevent depth buffer
* issues (Z-fighting, wrong occlusion) at a distance.
*
* If you have a collider (player etc.) coupled to camera movement a good
* initial value for the near clip distance is a value slightly above the
* collider radius.
*/
virtual float GetNearClipDistance() const = 0;
/**
* Set near clip distance of this camera.
*
* The default near clipping distance is controlled by the engine.
*/
virtual void SetNearClipDistance (float dist) = 0;
};
/**
* An implementation of iCamera that renders a world with a custom
* projection matrix.
*
* Main creators of instances implementing this interface:
* - iEngine::CreateCustomMatrixCamera()
*
* Main ways to get pointers to this interface:
* - iView::GetCustomMatrixCamera()
*/
struct iCustomMatrixCamera : public virtual iBase
{
SCF_INTERFACE(iCustomMatrixCamera, 1, 0, 0);
/// Get the iCamera interface for this camera.
virtual iCamera* GetCamera() = 0;
/// Set the projection matrix.
virtual void SetProjectionMatrix (const CS::Math::Matrix4& mat) = 0;
};
/** @} */
#endif // __CS_IENGINE_CAMERA_H__
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