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precision mediump float;
layout (location = 0) uniform vec4 color_intensity;
layout (location = 1) uniform vec2 center;
layout (location = 2) uniform uint falloff;
layout (location = 3) uniform vec2 size;
out vec4 color;
void main() {
vec2 pos = gl_FragCoord.xy;
float I = color_intensity.w;
vec2 tmp = pos - center;
float dist = sqrt(tmp.x*tmp.x + tmp.y*tmp.y);
float alpha = 1 - min(1, dist / I);
color = vec4(alpha * color_intensity.xyz, 1);
}
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