28 lines
455 B
GLSL
28 lines
455 B
GLSL
#version 330
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out vec4 frag_color;
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in vec2 apos;
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vec2 bpos;
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uniform float thickness; /* thickness in pixels */
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uniform float span;
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uniform vec3 color;
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void main(void)
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{
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float t = thickness / span;
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t /= 2.0;
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bpos.x = mod(apos.x, span) / span;
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bpos.y = mod(apos.y, span) / span;
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bpos.x -= t;
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bpos.y -= t;
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float comp = min(bpos.x, bpos.y);
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if (comp > t)
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discard;
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comp += t;
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frag_color = vec4(color, 1.0);
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}
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