/usr/share/fs-uae/shaders/curvature.shader is in fs-uae 2.4.1+ds-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | <?xml version="1.0" encoding="UTF-8"?>
<shader language="GLSL">
<fragment filter="linear"><![CDATA[
uniform sampler2D rubyTexture;
uniform vec2 rubyInputSize;
uniform vec2 rubyTextureSize;
// Tweak this parameter for more / less distortion
#define distortion 0.2
vec2 radialDistortion(vec2 coord) {
coord *= rubyTextureSize / rubyInputSize;
vec2 cc = coord - vec2(0.5);
float dist = dot(cc, cc) * distortion;
return (coord + cc * (1.0 + dist) * dist) * rubyInputSize / rubyTextureSize;
}
void main(void) {
gl_FragColor = texture2D(rubyTexture, radialDistortion(gl_TexCoord[0].xy));
}
]]></fragment>
</shader>
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