1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/sdr/psprite.p.glsl	Thu Jan 22 06:19:52 2015 +0200
     1.3 @@ -0,0 +1,12 @@
     1.4 +#version 120
     1.5 +
     1.6 +void main()
     1.7 +{
     1.8 +	vec2 pt = gl_PointCoord.xy * 2.0 - 1.0;
     1.9 +	float len = length(pt);
    1.10 +	vec2 dir = pt / len;
    1.11 +	float angle = atan(dir.y, dir.x);
    1.12 +
    1.13 +	float alpha = 1.0 - smoothstep(0.8, 0.9, len + abs(sin(angle * 8.0)) * 0.1);
    1.14 +	gl_FragColor = vec4(1.0, 1.0, 1.0, alpha);
    1.15 +}