49 lines
640 B
Plaintext
49 lines
640 B
Plaintext
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@vs vs
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in vec2 pos;
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out vec2 apos;
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uniform mpara {
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uniform vec2 offset;
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uniform vec2 dimen;
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};
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void main()
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{
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apos = ((pos*0.5)*dimen) + offset;
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gl_Position = vec4(pos, 0.f, 1.f);
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}
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@end
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@fs fs
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out vec4 frag_color;
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in vec2 apos;
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uniform fs_params {
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uniform float thickness;
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uniform float span;
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uniform vec4 color;
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};
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void main()
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{
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float t = thickness / span;
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t /= 2.0;
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vec2 bpos;
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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 = color;
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}
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@end
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@program grid vs fs
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