SFML/dotnet/examples/shader/resources/fisheye.sfx

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uniform sampler2D texture;
uniform vec2 mouse;
void main()
{
float len = distance(gl_TexCoord[0].xy, mouse) * 7.0;
vec2 coords = gl_TexCoord[0].xy;
if (len < 1.0)
coords += (gl_TexCoord[0].xy - mouse) * len;
gl_FragColor = texture2D(texture, coords) * gl_Color;
}