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/**
* @file llcamera.h
* @brief Header file for the LLCamera class.
*
* $LicenseInfo:firstyear=2000&license=viewergpl$
*
* Copyright (c) 2000-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_CAMERA_H
#define LL_CAMERA_H
#include "llmath.h"
#include "llcoordframe.h"
#include "llplane.h"
const F32 DEFAULT_FIELD_OF_VIEW = 60.f * DEG_TO_RAD;
const F32 DEFAULT_ASPECT_RATIO = 640.f / 480.f;
const F32 DEFAULT_NEAR_PLANE = 0.25f;
const F32 DEFAULT_FAR_PLANE = 64.f; // far reaches across two horizontal, not diagonal, regions
const F32 MAX_FIELD_OF_VIEW = F_PI;
const F32 MAX_ASPECT_RATIO = 50.0f;
const F32 MAX_NEAR_PLANE = 10.f;
const F32 MAX_FAR_PLANE = 100000.0f; //1000000.0f; // Max allowed. Not good Z precision though.
const F32 MAX_FAR_CLIP = 512.0f;
const F32 MIN_FIELD_OF_VIEW = 0.1f;
const F32 MIN_ASPECT_RATIO = 0.02f;
const F32 MIN_NEAR_PLANE = 0.1f;
const F32 MIN_FAR_PLANE = 0.2f;
static const LLVector3 X_AXIS(1.f,0.f,0.f);
static const LLVector3 Y_AXIS(0.f,1.f,0.f);
static const LLVector3 Z_AXIS(0.f,0.f,1.f);
static const LLVector3 NEG_X_AXIS(-1.f,0.f,0.f);
static const LLVector3 NEG_Y_AXIS(0.f,-1.f,0.f);
static const LLVector3 NEG_Z_AXIS(0.f,0.f,-1.f);
// An LLCamera is an LLCoorFrame with a view frustum.
// This means that it has several methods for moving it around
// that are inherited from the LLCoordFrame() class :
//
// setOrigin(), setAxes()
// translate(), rotate()
// roll(), pitch(), yaw()
// etc...
class LLCamera
: public LLCoordFrame
{
public:
enum {
PLANE_LEFT = 0,
PLANE_RIGHT = 1,
PLANE_BOTTOM = 2,
PLANE_TOP = 3,
PLANE_NUM = 4
};
enum {
PLANE_LEFT_MASK = (1<<PLANE_LEFT),
PLANE_RIGHT_MASK = (1<<PLANE_RIGHT),
PLANE_BOTTOM_MASK = (1<<PLANE_BOTTOM),
PLANE_TOP_MASK = (1<<PLANE_TOP),
PLANE_ALL_MASK = 0xf
};
enum {
HORIZ_PLANE_LEFT = 0,
HORIZ_PLANE_RIGHT = 1,
HORIZ_PLANE_NUM = 2
};
enum {
HORIZ_PLANE_LEFT_MASK = (1<<HORIZ_PLANE_LEFT),
HORIZ_PLANE_RIGHT_MASK = (1<<HORIZ_PLANE_RIGHT),
HORIZ_PLANE_ALL_MASK = 0x3
};
protected:
F32 mView; // angle between top and bottom frustum planes in radians.
F32 mAspect; // width/height
S32 mViewHeightInPixels; // for ViewHeightInPixels() only
F32 mNearPlane;
F32 mFarPlane;
LLPlane mLocalPlanes[4];
F32 mFixedDistance; // Always return this distance, unless < 0
LLVector3 mFrustCenter; // center of frustum and radius squared for ultra-quick exclusion test
F32 mFrustRadiusSquared;
LLPlane mWorldPlanes[PLANE_NUM];
LLPlane mHorizPlanes[HORIZ_PLANE_NUM];
struct frustum_plane
{
frustum_plane() : mask(0) {}
LLPlane p;
U8 mask;
};
frustum_plane mAgentPlanes[7]; //frustum planes in agent space a la gluUnproject (I'm a bastard, I know) - DaveP
U32 mPlaneCount; //defaults to 6, if setUserClipPlane is called, uses user supplied clip plane in
LLVector3 mWorldPlanePos; // Position of World Planes (may be offset from camera)
public:
LLVector3 mAgentFrustum[8]; //8 corners of 6-plane frustum
F32 mFrustumCornerDist; //distance to corner of frustum against far clip plane
public:
LLCamera();
LLCamera(F32 z_field_of_view, F32 aspect_ratio, S32 view_height_in_pixels, F32 near_plane, F32 far_plane);
void setUserClipPlane(LLPlane plane);
void disableUserClipPlane();
U8 calcPlaneMask(const LLPlane& plane);
void setView(F32 new_view);
void setViewHeightInPixels(S32 height);
void setAspect(F32 new_aspect);
void setNear(F32 new_near);
void setFar(F32 new_far);
F32 getView() const { return mView; } // vertical FOV in radians
S32 getViewHeightInPixels() const { return mViewHeightInPixels; }
F32 getAspect() const { return mAspect; } // width / height
F32 getNear() const { return mNearPlane; } // meters
F32 getFar() const { return mFarPlane; } // meters
F32 getYaw() const
{
return atan2f(mXAxis[VY], mXAxis[VX]);
}
F32 getPitch() const
{
F32 xylen = sqrtf(mXAxis[VX]*mXAxis[VX] + mXAxis[VY]*mXAxis[VY]);
return atan2f(mXAxis[VZ], xylen);
}
const LLPlane& getWorldPlane(S32 index) const { return mWorldPlanes[index]; }
const LLVector3& getWorldPlanePos() const { return mWorldPlanePos; }
// Copy mView, mAspect, mNearPlane, and mFarPlane to buffer.
// Return number of bytes copied.
size_t writeFrustumToBuffer(char *buffer) const;
// Copy mView, mAspect, mNearPlane, and mFarPlane from buffer.
// Return number of bytes copied.
size_t readFrustumFromBuffer(const char *buffer);
void calcAgentFrustumPlanes(LLVector3* frust);
// Returns 1 if partly in, 2 if fully in.
// NOTE: 'center' is in absolute frame.
S32 sphereInFrustumOld(const LLVector3 ¢er, const F32 radius) const;
S32 sphereInFrustum(const LLVector3 ¢er, const F32 radius) const;
S32 pointInFrustum(const LLVector3 &point) const { return sphereInFrustum(point, 0.0f); }
S32 sphereInFrustumFull(const LLVector3 ¢er, const F32 radius) const { return sphereInFrustum(center, radius); }
S32 AABBInFrustum(const LLVector3 ¢er, const LLVector3& radius);
S32 AABBInFrustumNoFarClip(const LLVector3 ¢er, const LLVector3& radius);
//does a quick 'n dirty sphere-sphere check
S32 sphereInFrustumQuick(const LLVector3 &sphere_center, const F32 radius);
// Returns height of object in pixels (must be height because field of view
// is based on window height).
F32 heightInPixels(const LLVector3 ¢er, F32 radius ) const;
// return the distance from pos to camera if visible (-distance if not visible)
F32 visibleDistance(const LLVector3 &pos, F32 rad, F32 fudgescale = 1.0f, U32 planemask = PLANE_ALL_MASK) const;
F32 visibleHorizDistance(const LLVector3 &pos, F32 rad, F32 fudgescale = 1.0f, U32 planemask = HORIZ_PLANE_ALL_MASK) const;
void setFixedDistance(F32 distance) { mFixedDistance = distance; }
friend std::ostream& operator<<(std::ostream &s, const LLCamera &C);
protected:
void calculateFrustumPlanes();
void calculateFrustumPlanes(F32 left, F32 right, F32 top, F32 bottom);
void calculateFrustumPlanesFromWindow(F32 x1, F32 y1, F32 x2, F32 y2);
void calculateWorldFrustumPlanes();
};
#endif
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