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29 lines
924 B
C
29 lines
924 B
C
#ifndef INT_AR
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#define INT_AR
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// Forces integer scaling and arbitrary aspect ratio
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// by hunterk
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// license: public domain
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// Apply in the vertex to the texCoord
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#pragma parameter ar_num "Aspect Ratio Numerator" 64.0 1.0 256. 1.0
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#pragma parameter ar_den "Aspect Ratio Denominator" 49.0 1.0 256. 1.0
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#pragma parameter integer_scale "Force Integer Scaling" 0.0 0.0 1.0 1.0
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#pragma parameter overscale "Integer Overscale" 0.0 0.0 1.0 1.0
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const vec2 middle = vec2(0.4999999, 0.4999999);
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vec2 int_ar(vec2 coord, vec4 tex_size, vec4 out_size){
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vec2 corrected_size = tex_size.xy * vec2(ar_num / ar_den, 1.0)
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* vec2(tex_size.y / tex_size.x, 1.0);
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float full_scale = (integer_scale > 0.5) ? floor(out_size.y /
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tex_size.y) + overscale : out_size.y / tex_size.y;
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vec2 scale = (out_size.xy / corrected_size) / full_scale;
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vec2 diff = coord.xy - middle;
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vec2 ar_coord = middle + diff * scale;
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return ar_coord;
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}
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#endif
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