/usr/share/movit/fft_pass_effect.frag is in libmovit5 1.4.0-1.
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 23 24 25 26 27 | // DIRECTION_VERTICAL will be #defined to 1 if we are doing a vertical FFT,
// and 0 otherwise.
// Implicit uniforms:
// uniform float PREFIX(num_repeats);
// uniform sampler2D PREFIX(support_tex);
vec4 FUNCNAME(vec2 tc) {
#if DIRECTION_VERTICAL
vec4 support = tex2D(PREFIX(support_tex), vec2(tc.y * PREFIX(num_repeats), 0.0));
vec4 c1 = INPUT(vec2(tc.x, tc.y + support.x));
vec4 c2 = INPUT(vec2(tc.x, tc.y + support.y));
#else
vec4 support = tex2D(PREFIX(support_tex), vec2(tc.x * PREFIX(num_repeats), 0.0));
vec4 c1 = INPUT(vec2(tc.x + support.x, tc.y));
vec4 c2 = INPUT(vec2(tc.x + support.y, tc.y));
#endif
// Two complex additions and multiplications in parallel; essentially
//
// result.xy = c1.xy + twiddle * c2.xy
// result.zw = c1.zw + twiddle * c2.zw
//
// where * is complex multiplication.
return c1 + support.z * c2 + support.w * vec4(-c2.y, c2.x, -c2.w, c2.z);
}
#undef DIRECTION_VERTICAL
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