| John Kessenich | 2f21fcc | 2015-06-17 16:15:09 +0000 | [diff] [blame] | 1 | #version 110
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| 2 | varying vec2 tex_coord;
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| 3 |
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| 4 | void main (void)
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| 5 | {
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| 6 | vec4 white = vec4(1.0);
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| 7 | vec4 black = vec4(0.2);
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| 8 | vec4 color = white;
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| 9 |
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| 10 | // First, cut out our circle
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| 11 | float x = tex_coord.x*2.0 - 1.0;
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| 12 | float y = tex_coord.y*2.0 - 1.0;
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| 13 |
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| 14 | float radius = sqrt(x*x + y*y);
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| 15 | if (radius > 1.0) {
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| 16 | if (radius > 1.1) {
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| 17 | ++color;
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| 18 | }
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| 19 |
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| 20 | gl_FragColor = color;
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| 21 |
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| 22 | if (radius > 1.2) {
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| 23 | ++color;
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| 24 | }
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| 25 |
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| 26 | }
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| 27 |
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| 28 | discard;
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| 29 |
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| 30 | // If we're near an edge, darken us a tiny bit
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| 31 | if (radius >= 0.75)
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| 32 | color -= abs(pow(radius, 16.0)/2.0);
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| 33 |
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| 34 | gl_FragColor = color;
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| 35 |
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| 36 | }
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