|  | #version 110
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							|  | varying vec2 tex_coord;
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							|  | 
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							|  | void main (void)
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							|  | {
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							|  |     vec4 white = vec4(1.0);
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							|  |     vec4 black = vec4(0.2);
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							|  |     vec4 color = white;
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							|  | 
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							|  |     // First, cut out our circle
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							|  |     float x = tex_coord.x*2.0 - 1.0;
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							|  |     float y = tex_coord.y*2.0 - 1.0;
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							|  | 
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							|  |     discard;
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							|  | 
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							|  | 
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							|  |     gl_FragColor = color;
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							|  | 
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							|  | }
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