[PATCH] drm: add fourcc codes for 16bit R and GR

[Rainer Hochecker]

I chose GR16 because that matches with Mesa texture formats. Unfortunately
RG16 is already taken by DRM_FORMAT_RGB565
<http://lxr.free-electrons.com/ident?v=3.6;i=DRM_FORMAT_RGB565>
So GR32 / RG32 might be better. All other codes in fourcc.h seem to sum up
all planes.

On Mon, Jan 2, 2017 at 3:05 PM, Ville Syrjälä <ville.syrjala at linux.intel.com
> wrote:

> On Mon, Jan 02, 2017 at 01:23:23PM +0100, David Herrmann wrote:
> > Hi
> >
> > On Mon, Jan 2, 2017 at 11:41 AM, Rainer Hochecker <fernetmenta at kodi.tv>
> wrote:
> > > From: Rainer Hochecker <fernetmenta at online.de>
> > >
> > > Add fourcc codes for 16bit planes. Required by mesa for
> > > eglCreateImageKHR to access P010 surfaces created by vaapi.
> > >
> > > Signed-off-by: Rainer Hochecker <fernetmenta at online.de>
> > > ---
> > >  include/uapi/drm/drm_fourcc.h | 6 ++++++
> > >  1 file changed, 6 insertions(+)
> > >
> > > diff --git a/include/uapi/drm/drm_fourcc.h
> b/include/uapi/drm/drm_fourcc.h
> > > index a5890bf..e6ab638 100644
> > > --- a/include/uapi/drm/drm_fourcc.h
> > > +++ b/include/uapi/drm/drm_fourcc.h
> > > @@ -41,10 +41,16 @@ extern "C" {
> > >  /* 8 bpp Red */
> > >  #define DRM_FORMAT_R8          fourcc_code('R', '8', ' ', ' ') /*
> [7:0] R */
> > >
> > > +/* 16 bpp Red */
> > > +#define DRM_FORMAT_R16         fourcc_code('R', '1', '6', ' ') /*
> [15:0] R */
> > > +
> > >  /* 16 bpp RG */
> > >  #define DRM_FORMAT_RG88                fourcc_code('R', 'G', '8',
> '8') /* [15:0] R:G 8:8 little endian */
> > >  #define DRM_FORMAT_GR88                fourcc_code('G', 'R', '8',
> '8') /* [15:0] G:R 8:8 little endian */
> > >
> > > +/* 32 bpp GR */
> > > +#define DRM_FORMAT_GR16                fourcc_code('G', 'R', '1',
> '6') /* [31:0] G:R 16:16 little endian */
> > > +
> >
> > Shouldn't it be 'G', 'R', '3', '2'?
>
> The name should be _GR1616. Using GR16 for the fourcc seems OK to me
> since we can't fit in the full GR1616 in there. Althogh GR32 could work
> too I suppose.
>
> And what about RG16?
>
> >
> > Also, please put dri-devel on CC.
> >
> > Thanks
> > David
> >
> > >  /* 8 bpp RGB */
> > >  #define DRM_FORMAT_RGB332      fourcc_code('R', 'G', 'B', '8') /*
> [7:0] R:G:B 3:3:2 */
> > >  #define DRM_FORMAT_BGR233      fourcc_code('B', 'G', 'R', '8') /*
> [7:0] B:G:R 2:3:3 */
> > > --
> > > 2.9.3
> > >
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
> --
> Ville Syrjälä
> Intel OTC
>
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