/*

 <codex>

 <abstract>

 Fragment shader for stars.

 </abstract>

 </codex>

 */

void main()

{

    float d = distance(vec2(0.5, 0.5), gl_TexCoord[0].st);

    float s = clamp(1.0 - 2.0 * d, 0.0, 1.0);

    float t = cos(0.5 * 3.1415 * s);

    float c = 1.0 - pow(t, 0.25);

    gl_FragColor = vec4(c, c, c, 1.0) * gl_Color;

}