1 // cloud.hxx -- model a single cloud layer
3 // Written by Curtis Olson, started June 2000.
5 // Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org
7 // This library is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU Library General Public
9 // License as published by the Free Software Foundation; either
10 // version 2 of the License, or (at your option) any later version.
12 // This library is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // Library General Public License for more details.
17 // You should have received a copy of the GNU Library General Public
18 // License along with this library; if not, write to the
19 // Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 // Boston, MA 02111-1307, USA.
25 #ifndef _SG_CLOUD_HXX_
26 #define _SG_CLOUD_HXX_
32 #include <simgear/compiler.h>
40 #define SG_MAX_CLOUD_TYPES 4 // change this if we add/remove cloud
41 // types en the enum below
44 SG_CLOUD_OVERCAST = 0,
45 SG_CLOUD_MOSTLY_CLOUDY = 1,
46 SG_CLOUD_MOSTLY_SUNNY = 2,
56 ssgTransform *layer_transform;
57 ssgSimpleState *layer_state;
63 // height above sea level (meters)
65 float layer_thickness;
66 float layer_transition;
70 // for handling texture coordinates to simulate cloud movement
71 // from winds, and to simulate the clouds being tied to ground
72 // position, not view position
74 double last_lon, last_lat;
82 ~SGCloudLayer( void );
84 // build the cloud object
85 void build( double size, double asl, double thickness,
86 double transition, ssgSimpleState *state );
88 // repaint the cloud colors based on current value of sun_angle,
89 // sky, and fog colors. This updates the color arrays for
91 // sun angle in degrees relative to verticle
92 // 0 degrees = high noon
93 // 90 degrees = sun rise/set
94 // 180 degrees = darkest midnight
95 bool repaint( sgVec3 fog_color );
97 // reposition the cloud layer at the specified origin and
99 // lon specifies a rotation about the Z axis
100 // lat specifies a rotation about the new Y axis
101 // spin specifies a rotation about the new Z axis (and orients the
102 // sunrise/set effects
103 bool reposition( sgVec3 p, sgVec3 up, double lon, double lat, double alt );
105 // draw the cloud layer
108 inline float get_asl() const { return layer_asl; }
109 inline float get_thickness() const { return layer_thickness; }
110 inline float get_transition() const { return layer_transition; }
114 // make an ssgSimpleState for a cloud layer given the named texture
115 ssgSimpleState *SGCloudMakeState( const string &path );
118 #endif // _SG_CLOUD_HXX_