roz/avidemux_shaders
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keep original format and scale pixels instead

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Roz K
2025-07-29 05:09:28 +02:00
parent 179ebc96d9
commit 39702c78ab
6 changed files with 14 additions and 11 deletions
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12
gopro_8:7/unfish_gopro_8:7.glsl
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@ -13,17 +13,19 @@ uniform float pts;
const vec2 half_pixel = vec2(0.5, 0.5);
const vec2 input_scale = vec2(0.652485, 1.0);
const float input_fov = 156.0;
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 / 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);
vec2 input_position = (coord - center) * input_scale;
float input_distance = length(input_position);
float input_len = diameter / radians(input_fov);
float output_len = diameter / (2.0 * tan(radians(output_fov) * 0.5));
float unfish_ratio = input_len * atan(input_distance / output_len) / input_distance;
return center + input_position * unfish_ratio;
}
void main() {