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avfilter/vf_v360: simplify tetrahedron input calculation

This commit is contained in:
Paul B Mahol 2020-02-29 13:00:25 +01:00
parent fc7d4d08fb
commit 50a13b987b
1 changed files with 5 additions and 8 deletions
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13
libavfilter/vf_v360.c
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@ -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;