roz/avidemux_shaders
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shader cleanup

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Roz K
2025-06-15 16:49:25 +02:00
parent a3b068c2dc
commit c8a23e2e2c
1 changed files with 5 additions and 5 deletions
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10
unfish_gopro_8-7_wide_hypersmooth-off.glsl
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@ -1,5 +1,6 @@
// RozK
// Adapted from https://github.com/duducosmos/defisheye,
// Fisheye removal for GoPro 11+, 8:7 ratio, without hypersmooth
// Adapted from https://github.com/duducosmos/defisheye
// itself based on http://www.fmwconcepts.com/imagemagick/defisheye/index.php
#extension GL_ARB_texture_rectangle: enable
@ -11,18 +12,17 @@ uniform vec2 myResolution;
uniform float pts;
const vec2 half_pixel = vec2(0.5, 0.5);
const float pi = 3.1415927;
const float input_fov = 156.0;
const float output_fov = 120.0;
const float output_fov = 119.789529;
vec2 unfish(vec2 coord) {
float diameter = sqrt(dot(myResolution, myResolution));
vec2 center = myResolution * 0.5;
vec2 position = coord - center;
float input_distance = length(position);
float input_foc = diameter * 180.0 / (input_fov * pi);
float output_foc = diameter / (2.0 * tan(output_fov * pi / 360.0));
float input_foc = diameter / radians(input_fov);
float output_foc = diameter / (2.0 * tan(radians(output_fov) * 0.5));
return center + position * (input_foc * atan(input_distance / output_foc) / input_distance);
}