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25 lines
630 B
C
25 lines
630 B
C
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#ifndef SHARP_COORD
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#define SHARP_COORD
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// wrap texture coordinate when sampling
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#pragma parameter ia_SHARPEN "Sharpen" 0.0 0.0 1.0 0.05
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const vec2 offset = vec2(0.5, 0.5);
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// based on "Improved texture interpolation" by Iñigo Quílez
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// Original description: http://www.iquilezles.org/www/articles/texture/texture.htm
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vec2 sharp(vec2 in_coord, vec4 tex_size){
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vec2 p = in_coord.xy;
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p = p * tex_size.xy + offset;
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vec2 i = floor(p);
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vec2 f = p - i;
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f = f * f * f * (f * (f * 6.0 - vec2(15.0, 15.0)) + vec2(10.0, 10.0));
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p = i + f;
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p = (p - offset) * tex_size.zw;
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p = mix(in_coord, p, ia_SHARPEN);
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return p;
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}
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#endif
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