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/**
* @file llfollowcam.h
* @author Jeffrey Ventrella
* @brief LLFollowCam class definition
*
* $LicenseInfo:firstyear=2005&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
//--------------------------------------------------------------------
// FollowCam
//
// The FollowCam controls three dynamic variables which determine
// a camera orientation and position for a "loose" third-person view
// (orientation being derived from a combination of focus and up
// vector). It is good for fast-moving vehicles that change
// acceleration a lot, but it can also be general-purpose, like for
// avatar navigation. It has a handful of parameters allowing it to
// be tweaked to assume different styles of tracking objects.
//
//--------------------------------------------------------------------
#ifndef LL_FOLLOWCAM_H
#define LL_FOLLOWCAM_H
#include "llcoordframe.h"
#include "indra_constants.h"
#include "llmath.h"
#include "lltimer.h"
#include "llquaternion.h"
#include "llcriticaldamp.h"
#include <map>
#include <vector>
class LLFollowCamParams
{
public:
LLFollowCamParams();
virtual ~LLFollowCamParams();
//--------------------------------------
// setty setty set set
//--------------------------------------
virtual void setPositionLag ( F32 );
virtual void setFocusLag ( F32 );
virtual void setFocusThreshold ( F32 );
virtual void setPositionThreshold ( F32 );
virtual void setDistance ( F32 );
virtual void setPitch ( F32 );
virtual void setFocusOffset ( const LLVector3& );
virtual void setBehindnessAngle ( F32 );
virtual void setBehindnessLag ( F32 );
virtual void setPosition ( const LLVector3& );
virtual void setFocus ( const LLVector3& );
virtual void setPositionLocked ( bool );
virtual void setFocusLocked ( bool );
//--------------------------------------
// getty getty get get
//--------------------------------------
virtual F32 getPositionLag() const;
virtual F32 getFocusLag() const;
virtual F32 getPositionThreshold() const;
virtual F32 getFocusThreshold() const;
virtual F32 getDistance() const;
virtual F32 getPitch() const;
virtual LLVector3 getFocusOffset() const;
virtual F32 getBehindnessAngle() const;
virtual F32 getBehindnessLag() const;
virtual LLVector3 getPosition() const;
virtual LLVector3 getFocus() const;
virtual bool getFocusLocked() const;
virtual bool getPositionLocked() const;
virtual bool getUseFocus() const { return mUseFocus; }
virtual bool getUsePosition() const { return mUsePosition; }
protected:
F32 mPositionLag;
F32 mFocusLag;
F32 mFocusThreshold;
F32 mPositionThreshold;
F32 mDistance;
F32 mPitch;
LLVector3 mFocusOffset;
F32 mBehindnessMaxAngle;
F32 mBehindnessLag;
F32 mMaxCameraDistantFromSubject;
bool mPositionLocked;
bool mFocusLocked;
bool mUsePosition; // specific camera point specified by script
bool mUseFocus; // specific focus point specified by script
LLVector3 mPosition; // where the camera is (in world-space)
LLVector3 mFocus; // what the camera is aimed at (in world-space)
};
class LLFollowCam : public LLFollowCamParams
{
public:
//--------------------
// Contructor
//--------------------
LLFollowCam();
//--------------------
// Destructor
//--------------------
virtual ~LLFollowCam();
//---------------------------------------------------------------------------------------
// The following methods must be called every time step. However, if you know for
// sure that your subject matter (what the camera is looking at) is not moving,
// then you can get away with not calling "update" But keep in mind that "update"
// may still be needed after the subject matter has stopped moving because the
// camera may still need to animate itself catching up to its ideal resting place.
//---------------------------------------------------------------------------------------
void setSubjectPositionAndRotation ( const LLVector3 p, const LLQuaternion r );
void update();
// initialize from another instance of llfollowcamparams
void copyParams(LLFollowCamParams& params);
//-----------------------------------------------------------------------------------
// this is how to bang the followCam into a specific configuration. Keep in mind
// that it will immediately try to adjust these values according to its attributes.
//-----------------------------------------------------------------------------------
void reset( const LLVector3 position, const LLVector3 focus, const LLVector3 upVector );
void setMaxCameraDistantFromSubject ( F32 m ); // this should be determined by llAgent
bool isZoomedToMinimumDistance();
LLVector3 getUpVector();
void zoom( S32 );
// overrides for setters and getters
virtual void setPitch( F32 );
virtual void setDistance( F32 );
virtual void setPosition(const LLVector3& pos);
virtual void setFocus(const LLVector3& focus);
virtual void setPositionLocked ( bool );
virtual void setFocusLocked ( bool );
LLVector3 getSimulatedPosition() const;
LLVector3 getSimulatedFocus() const;
//------------------------------------------
// protected members of FollowCam
//------------------------------------------
protected:
F32 mPitchCos; // derived from mPitch
F32 mPitchSin; // derived from mPitch
LLGlobalVec mSimulatedPositionGlobal; // where the camera is (global coordinates), simulated
LLGlobalVec mSimulatedFocusGlobal; // what the camera is aimed at (global coordinates), simulated
F32 mSimulatedDistance;
//---------------------
// dynamic variables
//---------------------
bool mZoomedToMinimumDistance;
LLFrameTimer mTimer;
LLVector3 mSubjectPosition; // this is the position of what I'm looking at
LLQuaternion mSubjectRotation; // this is the rotation of what I'm looking at
LLVector3 mUpVector; // the camera's up vector in world-space (determines roll)
LLVector3 mRelativeFocus;
LLVector3 mRelativePos;
bool mPitchSineAndCosineNeedToBeUpdated;
//------------------------------------------
// protected methods of FollowCam
//------------------------------------------
protected:
void calculatePitchSineAndCosine();
BOOL updateBehindnessConstraint(LLVector3 focus, LLVector3& cam_position);
};// end of FollowCam class
class LLFollowCamMgr
{
public:
static void cleanupClass ( );
static void setPositionLag ( const LLUUID& source, F32 lag);
static void setFocusLag ( const LLUUID& source, F32 lag);
static void setFocusThreshold ( const LLUUID& source, F32 threshold);
static void setPositionThreshold ( const LLUUID& source, F32 threshold);
static void setDistance ( const LLUUID& source, F32 distance);
static void setPitch ( const LLUUID& source, F32 pitch);
static void setFocusOffset ( const LLUUID& source, const LLVector3& offset);
static void setBehindnessAngle ( const LLUUID& source, F32 angle);
static void setBehindnessLag ( const LLUUID& source, F32 lag);
static void setPosition ( const LLUUID& source, const LLVector3 position);
static void setFocus ( const LLUUID& source, const LLVector3 focus);
static void setPositionLocked ( const LLUUID& source, bool locked);
static void setFocusLocked ( const LLUUID& source, bool locked );
static void setCameraActive ( const LLUUID& source, bool active );
static LLFollowCamParams* getActiveFollowCamParams();
static LLFollowCamParams* getParamsForID(const LLUUID& source);
static void removeFollowCamParams(const LLUUID& source);
static bool isScriptedCameraSource(const LLUUID& source);
static void dump();
protected:
typedef std::map<LLUUID, LLFollowCamParams*> param_map_t;
static param_map_t sParamMap;
typedef std::vector<LLFollowCamParams*> param_stack_t;
static param_stack_t sParamStack;
};
#endif //LL_FOLLOWCAM_H
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