ffmpeg | branch: master | Paul B Mahol <onemda@gmail.com> | Sat Feb 29 13:00:25 2020 +0100| [50a13b987b609f3280d2bc57cacbb67e2cf80521] | committer: Paul B Mahol avfilter/vf_v360: simplify tetrahedron input calculation

http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=50a13b987b609f3280...

libavfilter/vf_v360.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/libavfilter/vf_v360.c b/libavfilter/vf_v360.c index 31d5e60553..1cdbaf7330 100644 --- a/libavfilter/vf_v360.c +++ b/libavfilter/vf_v360.c @@ -2713,18 +2713,15 @@ static int xyz_to_tetrahedron(const V360Context *s, const float *vec, int width, int height, int16_t us[4][4], int16_t vs[4][4], float *du, float *dv) { - float d = 0.5f * (vec[0] * vec[0] + vec[1] * vec[1] + vec[2] * vec[2]); - - const float d0 = (vec[0] * 0.5f + vec[1] * 0.5f + vec[2] *-0.5f) / d; - const float d1 = (vec[0] *-0.5f + vec[1] *-0.5f + vec[2] *-0.5f) / d; - const float d2 = (vec[0] * 0.5f + vec[1] *-0.5f + vec[2] * 0.5f) / d; - const float d3 = (vec[0] *-0.5f + vec[1] * 0.5f + vec[2] * 0.5f) / d; + const float d0 = vec[0] * 1.f + vec[1] * 1.f + vec[2] *-1.f; + const float d1 = vec[0] *-1.f + vec[1] *-1.f + vec[2] *-1.f; + const float d2 = vec[0] * 1.f + vec[1] *-1.f + vec[2] * 1.f; + const float d3 = vec[0] *-1.f + vec[1] * 1.f + vec[2] * 1.f; + const float d = FFMAX(d0, FFMAX3(d1, d2, d3)); float uf, vf, x, y, z; int ui, vi; - d = FFMAX(d0, FFMAX3(d1, d2, d3)); - x = vec[0] / d; y = vec[1] / d; z = -vec[2] / d;