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
|
/**
* @file class1\environment\waterFogF.glsl
*
* $LicenseInfo:firstyear=2007&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2007, 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
* $/LicenseInfo$
*/
uniform vec4 waterPlane;
uniform vec4 waterFogColor;
uniform float waterFogDensity;
uniform float waterFogKS;
vec3 getPositionEye();
vec3 srgb_to_linear(vec3 col);
vec4 applyWaterFogView(vec3 pos, vec4 color)
{
vec3 view = normalize(pos);
//normalize view vector
float es = -(dot(view, waterPlane.xyz));
//find intersection point with water plane and eye vector
//get eye depth
float e0 = max(-waterPlane.w, 0.0);
vec3 int_v = waterPlane.w > 0.0 ? view * waterPlane.w/es : vec3(0.0, 0.0, 0.0);
//get object depth
float depth = length(pos - int_v);
//get "thickness" of water
float l = max(depth, 0.1);
float kd = waterFogDensity;
float ks = waterFogKS;
vec4 kc = waterFogColor;
float F = 0.98;
float t1 = -kd * pow(F, ks * e0);
float t2 = kd + ks * es;
float t3 = pow(F, t2*l) - 1.0;
float L = min(t1/t2*t3, 1.0);
float D = pow(0.98, l*kd);
color.rgb = color.rgb * D + kc.rgb * L;
return color;
}
vec4 applyWaterFogViewLinearNoClip(vec3 pos, vec4 color, vec3 sunlit)
{
vec3 view = normalize(pos);
//normalize view vector
float es = -(dot(view, waterPlane.xyz));
//find intersection point with water plane and eye vector
//get eye depth
float e0 = max(-waterPlane.w, 0.0);
vec3 int_v = waterPlane.w > 0.0 ? view * waterPlane.w / es : vec3(0.0, 0.0, 0.0);
//get object depth
float depth = length(pos - int_v);
//get "thickness" of water
float l = max(depth, 0.1);
float kd = waterFogDensity;
float ks = waterFogKS;
vec4 kc = waterFogColor;
kc.rgb = srgb_to_linear(kc.rgb); // TODO -- pass in waterFogColor linear
kc.rgb *= sunlit;
float F = 0.98;
float t1 = -kd * pow(F, ks * e0);
float t2 = kd + ks * es;
float t3 = pow(F, t2 * l) - 1.0;
float L = min(t1 / t2 * t3, 1.0);
float D = pow(0.98, l * kd);
color.rgb = color.rgb * D + kc.rgb * L;
return color;
}
vec4 applyWaterFogViewLinear(vec3 pos, vec4 color, vec3 sunlit)
{
if (dot(pos, waterPlane.xyz) + waterPlane.w > 0.0)
{
return color;
}
return applyWaterFogViewLinearNoClip(pos, color, sunlit);
}
vec4 applyWaterFogViewLinear(vec3 pos, vec4 color)
{
return applyWaterFogViewLinear(pos, color, vec3(1));
}
vec4 applyWaterFog(vec4 color)
{
//normalize view vector
return applyWaterFogViewLinear(getPositionEye(), color);
}
|
