unfish: switch to linear method
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@ -1,5 +1,6 @@
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// Adapted from https://github.com/duducosmos/defisheye
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// (then resize to 1568x1080)
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// RozK
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// Adapted from https://github.com/duducosmos/defisheye,
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// itself based on http://www.fmwconcepts.com/imagemagick/defisheye/index.php
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#extension GL_ARB_texture_rectangle: enable
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@ -12,15 +13,17 @@ uniform float pts;
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const vec2 half_pixel = vec2(0.5, 0.5);
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const float pi = 3.1415927;
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const float input_fov = 150.0 * pi / 720.0;
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const float output_fov = 116.0 * pi / 360.0;
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const float input_fov = 156.0;
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const float output_fov = 120.0;
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vec2 unfish(vec2 coord) {
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vec2 center = myResolution * 0.5;
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vec2 pos = coord - center;
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float rd = length(pos);
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float diameter = sqrt(dot(myResolution, myResolution));
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return center + pos * ((diameter / (2.0 * sin(input_fov))) * sin(atan(rd / (diameter / (2.0 * tan(output_fov)))) * 0.5) / rd);
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vec2 center = myResolution * 0.5;
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vec2 position = coord - center;
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float input_distance = length(position);
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float input_foc = diameter * 180.0 / (input_fov * pi);
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float output_foc = diameter / (2.0 * tan(output_fov * pi / 360.0));
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return center + position * (input_foc * atan(input_distance / output_foc) / input_distance);
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}
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void main() {
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