diff options
| author | Brian Paul <[email protected]> | 2012-07-24 11:11:45 -0600 |
|---|---|---|
| committer | Brian Paul <[email protected]> | 2012-07-26 13:59:43 -0600 |
| commit | 50db8129152f3d5ea8db13d55f82673d53bf1b8f (patch) | |
| tree | 308c3a6c93f37ea68d499475f4b87dc0806279e9 /src/mesa/math/m_matrix.c | |
| parent | 148c8e639da7ee10fc9e002e3c6d60e17d218b21 (diff) | |
mesa: loosen small matrix determinant check
When computing a matrix inverse, if the determinant is too small we could hit
a divide by zero. There's a check to prevent this (we basically give up on
computing the inverse and return the identity matrix.) This patch loosens
this test to fix a lighting bug reported by Lars Henning Wendt.
v2: use abs(det) to handle negative values
NOTE: This is a candidate for the 8.0 branch.
Tested-by: Lars Henning Wendt <[email protected]>
Diffstat (limited to 'src/mesa/math/m_matrix.c')
| -rw-r--r-- | src/mesa/math/m_matrix.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mesa/math/m_matrix.c b/src/mesa/math/m_matrix.c index 02aedbad856..ffbdcdb4c96 100644 --- a/src/mesa/math/m_matrix.c +++ b/src/mesa/math/m_matrix.c @@ -513,7 +513,7 @@ static GLboolean invert_matrix_3d_general( GLmatrix *mat ) det = pos + neg; - if (det*det < 1e-25) + if (FABSF(det) < 1e-25) return GL_FALSE; det = 1.0F / det; |