1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/**
* @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_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_ASPECT_RATIO = 0.02f;
const F32 MIN_NEAR_PLANE = 0.1f;
const F32 MIN_FAR_PLANE = 0.2f;
// Min/Max FOV values for square views. Call getMin/MaxView to get extremes based on current aspect ratio.
static const F32 MIN_FIELD_OF_VIEW = 5.0f * DEG_TO_RAD;
static const F32 MAX_FIELD_OF_VIEW = 175.f * DEG_TO_RAD;
// 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
};
private:
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 vertical_fov_rads, F32 aspect_ratio, S32 view_height_in_pixels, F32 near_plane, F32 far_plane);
virtual ~LLCamera(){} // no-op virtual destructor
void setUserClipPlane(LLPlane plane);
void disableUserClipPlane();
U8 calcPlaneMask(const LLPlane& plane);
virtual void setView(F32 vertical_fov_rads);
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
// The values returned by the min/max view getters depend upon the aspect ratio
// at the time they are called and therefore should not be cached.
F32 getMinView() const;
F32 getMaxView() const;
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
|
