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- #version 110
- varying vec2 tex_coord;
- void main (void)
- {
- vec4 white = vec4(1.0);
- vec4 black = vec4(0.2);
- vec4 color = white;
- // First, cut out our circle
- float x = tex_coord.x*2.0 - 1.0;
- float y = tex_coord.y*2.0 - 1.0;
- float radius = sqrt(x*x + y*y);
- if (radius > 1.0) {
- if (radius > 1.1) {
- ++color;
- }
- gl_FragColor = color;
- if (radius > 1.2) {
- ++color;
- }
- discard;
- }
- // If we're near an edge, darken us a tiny bit
- if (radius >= 0.75)
- color -= abs(pow(radius, 16.0)/2.0);
- gl_FragColor = color;
- }
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