diff options
author | Paul B Mahol <onemda@gmail.com> | 2019-09-21 16:07:16 +0200 |
---|---|---|
committer | Paul B Mahol <onemda@gmail.com> | 2019-09-21 16:31:32 +0200 |
commit | ecaef69fbb1ed011a14624d944113e32a17d7780 (patch) | |
tree | c355c3cfc120fbaf034df56e1de2f1134fd131b2 /libavfilter | |
parent | b8dfc108a22501fc7b07cf1c1835d3d9e576398a (diff) |
avfilter/vf_v360: simplify xyz_to_ball() calculations
Diffstat (limited to 'libavfilter')
-rw-r--r-- | libavfilter/vf_v360.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/libavfilter/vf_v360.c b/libavfilter/vf_v360.c index d966723770..1a0fe90909 100644 --- a/libavfilter/vf_v360.c +++ b/libavfilter/vf_v360.c @@ -1603,12 +1603,13 @@ static void xyz_to_ball(const V360Context *s, uint16_t us[4][4], uint16_t vs[4][4], float *du, float *dv) { const float l = hypotf(vec[0], vec[1]); - const float r = sinf(acosf(-vec[2]) * 0.5f); + const float r = sqrtf(1.f + vec[2]) / M_SQRT2; float uf, vf; int ui, vi; - uf = (1.f - r * vec[0] * s->input_mirror_modifier[0] / l) * width / 2.f; - vf = (1.f + r * vec[1] * s->input_mirror_modifier[1] / l) * height / 2.f; + uf = (1.f + r * vec[0] * s->input_mirror_modifier[0] / (l > 0.f ? l : 1.f)) * width * 0.5f; + vf = (1.f - r * vec[1] * s->input_mirror_modifier[1] / (l > 0.f ? l : 1.f)) * height * 0.5f; + ui = floorf(uf); vi = floorf(vf); |