208 lines
7.2 KiB
C++
208 lines
7.2 KiB
C++
/**
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* @file llcamera.h
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* @brief Header file for the LLCamera class.
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*
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* $LicenseInfo:firstyear=2000&license=viewergpl$
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*
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* Copyright (c) 2000-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#ifndef LL_CAMERA_H
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#define LL_CAMERA_H
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#include "llmath.h"
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#include "llcoordframe.h"
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#include "llplane.h"
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const F32 DEFAULT_FIELD_OF_VIEW = 60.f * DEG_TO_RAD;
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const F32 DEFAULT_ASPECT_RATIO = 640.f / 480.f;
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const F32 DEFAULT_NEAR_PLANE = 0.25f;
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const F32 DEFAULT_FAR_PLANE = 64.f; // far reaches across two horizontal, not diagonal, regions
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const F32 MAX_ASPECT_RATIO = 50.0f;
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const F32 MAX_NEAR_PLANE = 10.f;
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const F32 MAX_FAR_PLANE = 100000.0f; //1000000.0f; // Max allowed. Not good Z precision though.
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const F32 MAX_FAR_CLIP = 512.0f;
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const F32 MIN_ASPECT_RATIO = 0.02f;
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const F32 MIN_NEAR_PLANE = 0.1f;
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const F32 MIN_FAR_PLANE = 0.2f;
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// Min/Max FOV values for square views. Call getMin/MaxView to get extremes based on current aspect ratio.
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static const F32 MIN_FIELD_OF_VIEW = 5.0f * DEG_TO_RAD;
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static const F32 MAX_FIELD_OF_VIEW = 175.f * DEG_TO_RAD;
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// An LLCamera is an LLCoorFrame with a view frustum.
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// This means that it has several methods for moving it around
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// that are inherited from the LLCoordFrame() class :
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//
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// setOrigin(), setAxes()
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// translate(), rotate()
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// roll(), pitch(), yaw()
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// etc...
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class LLCamera
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: public LLCoordFrame
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{
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public:
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enum {
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PLANE_LEFT = 0,
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PLANE_RIGHT = 1,
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PLANE_BOTTOM = 2,
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PLANE_TOP = 3,
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PLANE_NUM = 4
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};
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enum {
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PLANE_LEFT_MASK = (1<<PLANE_LEFT),
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PLANE_RIGHT_MASK = (1<<PLANE_RIGHT),
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PLANE_BOTTOM_MASK = (1<<PLANE_BOTTOM),
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PLANE_TOP_MASK = (1<<PLANE_TOP),
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PLANE_ALL_MASK = 0xf
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};
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enum {
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HORIZ_PLANE_LEFT = 0,
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HORIZ_PLANE_RIGHT = 1,
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HORIZ_PLANE_NUM = 2
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};
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enum {
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HORIZ_PLANE_LEFT_MASK = (1<<HORIZ_PLANE_LEFT),
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HORIZ_PLANE_RIGHT_MASK = (1<<HORIZ_PLANE_RIGHT),
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HORIZ_PLANE_ALL_MASK = 0x3
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};
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private:
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F32 mView; // angle between top and bottom frustum planes in radians.
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F32 mAspect; // width/height
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S32 mViewHeightInPixels; // for ViewHeightInPixels() only
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F32 mNearPlane;
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F32 mFarPlane;
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LLPlane mLocalPlanes[4];
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F32 mFixedDistance; // Always return this distance, unless < 0
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LLVector3 mFrustCenter; // center of frustum and radius squared for ultra-quick exclusion test
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F32 mFrustRadiusSquared;
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LLPlane mWorldPlanes[PLANE_NUM];
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LLPlane mHorizPlanes[HORIZ_PLANE_NUM];
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struct frustum_plane
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{
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frustum_plane() : mask(0) {}
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LLPlane p;
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U8 mask;
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};
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frustum_plane mAgentPlanes[7]; //frustum planes in agent space a la gluUnproject (I'm a bastard, I know) - DaveP
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U32 mPlaneCount; //defaults to 6, if setUserClipPlane is called, uses user supplied clip plane in
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LLVector3 mWorldPlanePos; // Position of World Planes (may be offset from camera)
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public:
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LLVector3 mAgentFrustum[8]; //8 corners of 6-plane frustum
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F32 mFrustumCornerDist; //distance to corner of frustum against far clip plane
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public:
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LLCamera();
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LLCamera(F32 vertical_fov_rads, F32 aspect_ratio, S32 view_height_in_pixels, F32 near_plane, F32 far_plane);
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virtual ~LLCamera(){} // no-op virtual destructor
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void setUserClipPlane(LLPlane plane);
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void disableUserClipPlane();
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U8 calcPlaneMask(const LLPlane& plane);
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virtual void setView(F32 vertical_fov_rads);
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void setViewHeightInPixels(S32 height);
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void setAspect(F32 new_aspect);
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void setNear(F32 new_near);
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void setFar(F32 new_far);
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F32 getView() const { return mView; } // vertical FOV in radians
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S32 getViewHeightInPixels() const { return mViewHeightInPixels; }
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F32 getAspect() const { return mAspect; } // width / height
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F32 getNear() const { return mNearPlane; } // meters
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F32 getFar() const { return mFarPlane; } // meters
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// The values returned by the min/max view getters depend upon the aspect ratio
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// at the time they are called and therefore should not be cached.
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F32 getMinView() const;
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F32 getMaxView() const;
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F32 getYaw() const
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{
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return atan2f(mXAxis[VY], mXAxis[VX]);
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}
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F32 getPitch() const
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{
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F32 xylen = sqrtf(mXAxis[VX]*mXAxis[VX] + mXAxis[VY]*mXAxis[VY]);
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return atan2f(mXAxis[VZ], xylen);
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}
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const LLPlane& getWorldPlane(S32 index) const { return mWorldPlanes[index]; }
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const LLVector3& getWorldPlanePos() const { return mWorldPlanePos; }
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// Copy mView, mAspect, mNearPlane, and mFarPlane to buffer.
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// Return number of bytes copied.
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size_t writeFrustumToBuffer(char *buffer) const;
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// Copy mView, mAspect, mNearPlane, and mFarPlane from buffer.
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// Return number of bytes copied.
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size_t readFrustumFromBuffer(const char *buffer);
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void calcAgentFrustumPlanes(LLVector3* frust);
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// Returns 1 if partly in, 2 if fully in.
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// NOTE: 'center' is in absolute frame.
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S32 sphereInFrustumOld(const LLVector3 ¢er, const F32 radius) const;
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S32 sphereInFrustum(const LLVector3 ¢er, const F32 radius) const;
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S32 pointInFrustum(const LLVector3 &point) const { return sphereInFrustum(point, 0.0f); }
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S32 sphereInFrustumFull(const LLVector3 ¢er, const F32 radius) const { return sphereInFrustum(center, radius); }
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S32 AABBInFrustum(const LLVector3 ¢er, const LLVector3& radius);
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S32 AABBInFrustumNoFarClip(const LLVector3 ¢er, const LLVector3& radius);
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//does a quick 'n dirty sphere-sphere check
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S32 sphereInFrustumQuick(const LLVector3 &sphere_center, const F32 radius);
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// Returns height of object in pixels (must be height because field of view
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// is based on window height).
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F32 heightInPixels(const LLVector3 ¢er, F32 radius ) const;
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// return the distance from pos to camera if visible (-distance if not visible)
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F32 visibleDistance(const LLVector3 &pos, F32 rad, F32 fudgescale = 1.0f, U32 planemask = PLANE_ALL_MASK) const;
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F32 visibleHorizDistance(const LLVector3 &pos, F32 rad, F32 fudgescale = 1.0f, U32 planemask = HORIZ_PLANE_ALL_MASK) const;
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void setFixedDistance(F32 distance) { mFixedDistance = distance; }
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friend std::ostream& operator<<(std::ostream &s, const LLCamera &C);
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protected:
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void calculateFrustumPlanes();
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void calculateFrustumPlanes(F32 left, F32 right, F32 top, F32 bottom);
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void calculateFrustumPlanesFromWindow(F32 x1, F32 y1, F32 x2, F32 y2);
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void calculateWorldFrustumPlanes();
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};
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#endif
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