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#version 120
uniform sampler2D sampler;
uniform int numLight;
uniform vec2 lightLocation[64];
uniform float fireFlicker[64];
uniform vec3 lightColor;
uniform float amb;
float b = .0005f;
float minLight = .05f;
float radius = sqrt(1.0f / (b * minLight));
//float radius = b*minlight;
float rand(vec2 co){
return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);
}
void main(){
vec4 color = vec4(0.0f, 0.0f, 0.0f, 0.0f);
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(1.0f - dist*dist/(radius*radius), 0.0f, 1.0f); attenuation *= attenuation;
color += vec4(attenuation, attenuation, attenuation, 1.0f) * vec4(lightColor, 1.0f) * fireFlicker[i];
}
vec2 coords = gl_TexCoord[0].st;
vec4 tex = texture2D(sampler, coords);
color += vec4(amb,amb,amb,1.0f+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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