#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
*/