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
|
/**
* @file spotLightF.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
* $/LicenseInfo$
*/
#extension GL_ARB_texture_rectangle : enable
#ifdef DEFINE_GL_FRAGCOLOR
out vec4 gl_FragColor;
#endif
uniform sampler2DRect diffuseRect;
uniform sampler2DRect specularRect;
uniform sampler2DRect depthMap;
uniform sampler2DRect normalMap;
uniform sampler2D noiseMap;
uniform sampler2D projectionMap;
uniform mat4 proj_mat; //screen space to light space
uniform float proj_near; //near clip for projection
uniform vec3 proj_p; //plane projection is emitting from (in screen space)
uniform vec3 proj_n;
uniform float proj_focus; //distance from plane to begin blurring
uniform float proj_lod; //(number of mips in proj map)
uniform float proj_range; //range between near clip and far clip plane of projection
uniform float proj_ambiance;
uniform float near_clip;
uniform float far_clip;
uniform vec3 proj_origin; //origin of projection to be used for angular attenuation
uniform float sun_wash;
uniform vec3 center;
uniform vec3 color;
uniform float falloff;
uniform float size;
VARYING vec4 vary_fragcoord;
uniform vec2 screen_res;
uniform mat4 inv_proj;
vec4 getPosition(vec2 pos_screen)
{
float depth = texture2DRect(depthMap, pos_screen.xy).a;
vec2 sc = pos_screen.xy*2.0;
sc /= screen_res;
sc -= vec2(1.0,1.0);
vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
vec4 pos = inv_proj * ndc;
pos /= pos.w;
pos.w = 1.0;
return pos;
}
void main()
{
vec4 frag = vary_fragcoord;
frag.xyz /= frag.w;
frag.xyz = frag.xyz*0.5+0.5;
frag.xy *= screen_res;
vec3 pos = getPosition(frag.xy).xyz;
vec3 lv = center.xyz-pos.xyz;
float dist2 = dot(lv,lv);
dist2 /= size;
if (dist2 > 1.0)
{
discard;
}
vec3 norm = texture2DRect(normalMap, frag.xy).xyz;
norm = vec3((norm.xy-0.5)*2.0,norm.z); // unpack norm
norm = normalize(norm);
float l_dist = -dot(lv, proj_n);
vec4 proj_tc = (proj_mat * vec4(pos.xyz, 1.0));
if (proj_tc.z < 0.0)
{
discard;
}
proj_tc.xyz /= proj_tc.w;
float fa = falloff+1.0;
float dist_atten = clamp(1.0-(dist2-1.0*(1.0-fa))/fa, 0.0, 1.0);
lv = proj_origin-pos.xyz;
lv = normalize(lv);
float da = dot(norm, lv);
vec3 col = vec3(0,0,0);
vec3 diff_tex = texture2DRect(diffuseRect, frag.xy).rgb;
float noise = texture2D(noiseMap, frag.xy/128.0).b;
if (proj_tc.z > 0.0 &&
proj_tc.x < 1.0 &&
proj_tc.y < 1.0 &&
proj_tc.x > 0.0 &&
proj_tc.y > 0.0)
{
float lit = 0.0;
if (da > 0.0)
{
float diff = clamp((l_dist-proj_focus)/proj_range, 0.0, 1.0);
float lod = diff * proj_lod;
vec4 plcol = texture2DLod(projectionMap, proj_tc.xy, lod);
vec3 lcol = color.rgb * plcol.rgb * plcol.a;
lit = da * dist_atten * noise;
col = lcol*lit*diff_tex;
}
float diff = clamp((proj_range-proj_focus)/proj_range, 0.0, 1.0);
float lod = diff * proj_lod;
vec4 amb_plcol = texture2DLod(projectionMap, proj_tc.xy, lod);
//float amb_da = mix(proj_ambiance, proj_ambiance*max(-da, 0.0), max(da, 0.0));
float amb_da = proj_ambiance;
amb_da += (da*da*0.5+0.5)*proj_ambiance;
amb_da *= dist_atten * noise;
amb_da = min(amb_da, 1.0-lit);
col += amb_da*color.rgb*diff_tex.rgb*amb_plcol.rgb*amb_plcol.a;
}
vec4 spec = texture2DRect(specularRect, frag.xy);
if (spec.a > 0.0)
{
vec3 ref = reflect(normalize(pos), norm);
//project from point pos in direction ref to plane proj_p, proj_n
vec3 pdelta = proj_p-pos;
float ds = dot(ref, proj_n);
if (ds < 0.0)
{
vec3 pfinal = pos + ref * dot(pdelta, proj_n)/ds;
vec3 stc = (proj_mat * vec4(pfinal.xyz, 1.0)).xyz;
if (stc.z > 0.0)
{
stc.xy /= stc.z+proj_near;
if (stc.x < 1.0 &&
stc.y < 1.0 &&
stc.x > 0.0 &&
stc.y > 0.0)
{
vec4 scol = texture2DLod(projectionMap, stc.xy, proj_lod-spec.a*proj_lod);
col += dist_atten*scol.rgb*color.rgb*scol.a*spec.rgb;
}
}
}
}
gl_FragColor.rgb = col;
gl_FragColor.a = 0.0;
}
|
