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#version 120
uniform sampler2D sampler;
uniform int numLight;
uniform vec2 lightLocation[64];
uniform vec3 lightColor;
uniform float amb;
float b = .0005;
float minLight = .05;
float radius = sqrt(1.0 / (b * minLight));
//float radius = b*minlight;
void main(){
vec4 color = vec4(0.0,0.0,0.0,0.0);
for(int i = 0; i < numLight; i++){
vec2 loc = lightLocation[i];
float dist = length(loc - gl_FragCoord.xy);
//float attenuation=1.0/(1.0+0.01*dist+0.00000000001*dist*dist);
float attenuation = clamp(1.0 - dist*dist/(radius*radius), 0.0, 1.0); attenuation *= attenuation;
color += vec4(attenuation, attenuation, attenuation, 1.0) * vec4(lightColor, 1.0);
}
vec2 coords = gl_TexCoord[0].st;
vec4 tex = texture2D(sampler, coords);
color += vec4(amb,amb,amb,1.0+amb);
gl_FragColor = tex * vec4(color)*tex.a;
}
/* b values
.002 10
.008 50
.0005 200
.00008 500
.00002 1000
.00005 2000
*/
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