wt., 18 wrz 2018 o 15:59 Sergii Romantsov <sergii.romant...@gmail.com>
napisał(a):
>
> Specification doesn't define behaviour for rotation of 0-vector.
> Windows and Nvidia drivers have a workaround for that.
> For compatibility proposed that for 0-vector a rotation will be
> done around x-axis.
>
> -v2: logic moved to _math_matrix_rotate
>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100960
> Signed-off-by: Sergii Romantsov <sergii.romant...@globallogic.com>
> ---
> src/mesa/math/m_matrix.c | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
> diff --git a/src/mesa/math/m_matrix.c b/src/mesa/math/m_matrix.c
> index 57a4953..2b3adb3 100644
> --- a/src/mesa/math/m_matrix.c
> +++ b/src/mesa/math/m_matrix.c
> @@ -824,6 +824,25 @@ _math_matrix_rotate( GLmatrix *mat,
> M(1,0) = s;
> }
> }
> + else {
> + /* https://bugs.freedesktop.org/show_bug.cgi?id=100960
> + * https://github.com/KhronosGroup/OpenGL-API/issues/41
> + * So that is kind of workaround for empty-vectors to have
> + * compatibility with Windows and Nvidia drivers.
> + */
> + optimized = GL_TRUE;
> + /* rotate only around x-axis */
> + M(1,1) = c;
> + M(2,2) = c;
> + if (x < 0.0F) {
Isn't x guaranteed to be 0.0F here? And I think you wanted to treat it
as 1.0F in that case, so that (0, 0, 0) becomes (1, 0, 0).
Regards,
Gustaw Smolarczyk
> + M(1,2) = s;
> + M(2,1) = -s;
> + }
> + else {
> + M(1,2) = -s;
> + M(2,1) = s;
> + }
> + }
> }
> else if (z == 0.0F) {
> optimized = GL_TRUE;
> --
> 2.7.4
>
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