[vlc-devel] [PATCH v2 1/8] viewpoint: add reverse viewpoint function

[Rémi Denis-Courmont]

Le keskiviikkona 6. maaliskuuta 2019, 17.31.31 EET Alexandre Janniaux a écrit 
:
> It reverses the transformation (here rotation only) which is helpful to
> convert the viewpoint rotation into a world rotation for video outputs.
> ---
>  include/vlc_viewpoint.h | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/include/vlc_viewpoint.h b/include/vlc_viewpoint.h
> index b9e162b02e..7c11c86323 100644
> --- a/include/vlc_viewpoint.h
> +++ b/include/vlc_viewpoint.h
> @@ -59,4 +59,18 @@ static inline void vlc_viewpoint_clip( vlc_viewpoint_t
> *p_vp ) FIELD_OF_VIEW_DEGREES_MAX );
>  }
> 
> +/**
> + * Reverse the viewpoint rotation.
> + *
> + * It can be used to convert a camera view into a world transformation.
> + *
> + * \param vp the viewpoint for which the rotation need to be reversed
> + */
> +static inline void vlc_viewpoint_reverse( vlc_viewpoint_t *vp )
> +{
> +    vp->yaw   *= -1;
> +    vp->pitch *= -1;
> +    vp->roll  *= -1;

You probably mean '-1.f'

> +}
> +
>  #endif /* VLC_VIEWPOINT_H_ */


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