[Mesa-dev] [PATCH 1/2] gbm: Add a flag to enable creation of rotated scanout buffers

[Ville Syrjälä]

On Fri, Oct 23, 2015 at 12:18:39PM +0900, Michel Dänzer wrote:
> On 23.10.2015 10:44, Vivek Kasireddy wrote:
> > For certain platforms that support rotated scanout buffers, currently,
> > there is no way to create them with the GBM DRI interface. This flag
> > will instruct the DRI driver to create the buffer by setting
> > additional requirements.
> > 
> > Cc: Kristian Hogsberg <krh at bitplanet.net>
> > Signed-off-by: Vivek Kasireddy <vivek.kasireddy at intel.com>
> > ---
> >  include/GL/internal/dri_interface.h | 1 +
> >  src/gbm/backends/dri/gbm_dri.c      | 9 +++++++--
> >  src/gbm/main/gbm.h                  | 5 +++++
> >  3 files changed, 13 insertions(+), 2 deletions(-)
> > 
> > diff --git a/include/GL/internal/dri_interface.h b/include/GL/internal/dri_interface.h
> > index a0f155a..2271217 100644
> > --- a/include/GL/internal/dri_interface.h
> > +++ b/include/GL/internal/dri_interface.h
> > @@ -1091,6 +1091,7 @@ struct __DRIdri2ExtensionRec {
> >  #define __DRI_IMAGE_USE_SCANOUT		0x0002
> >  #define __DRI_IMAGE_USE_CURSOR		0x0004 /* Depricated */
> >  #define __DRI_IMAGE_USE_LINEAR		0x0008
> > +#define __DRI_IMAGE_USE_SCANOUT_ROTATED_90_270		0x0010
> >  
> >  
> >  /**
> 
> Thank you for splitting out the driver change. Sorry I didn't think of
> this before, but it might be worth splitting out the dri_interface.h
> change as well. I'm fine either way, though.
> 
> 
> > diff --git a/src/gbm/backends/dri/gbm_dri.c b/src/gbm/backends/dri/gbm_dri.c
> > index 57cdeac..cde63de 100644
> > --- a/src/gbm/backends/dri/gbm_dri.c
> > +++ b/src/gbm/backends/dri/gbm_dri.c
> > @@ -539,7 +539,7 @@ gbm_dri_is_format_supported(struct gbm_device *gbm,
> >        break;
> >     case GBM_BO_FORMAT_ARGB8888:
> >     case GBM_FORMAT_ARGB8888:
> > -      if (usage & GBM_BO_USE_SCANOUT)
> > +      if (usage & (GBM_BO_USE_SCANOUT | GBM_BO_USE_SCANOUT_ROTATED_90_270))
> >           return 0;
> >        break;
> >     default:
> > @@ -748,6 +748,8 @@ gbm_dri_bo_import(struct gbm_device *gbm,
> >  
> >     if (usage & GBM_BO_USE_SCANOUT)
> >        dri_use |= __DRI_IMAGE_USE_SCANOUT;
> > +   if (usage & GBM_BO_USE_SCANOUT_ROTATED_90_270)
> > +      dri_use |= __DRI_IMAGE_USE_SCANOUT_ROTATED_90_270;
> >     if (usage & GBM_BO_USE_CURSOR)
> >        dri_use |= __DRI_IMAGE_USE_CURSOR;
> >     if (dri->image->base.version >= 2 &&
> > @@ -786,7 +788,8 @@ create_dumb(struct gbm_device *gbm,
> >  
> >     is_cursor = (usage & GBM_BO_USE_CURSOR) != 0 &&
> >        format == GBM_FORMAT_ARGB8888;
> > -   is_scanout = (usage & GBM_BO_USE_SCANOUT) != 0 &&
> > +   is_scanout = (usage & (GBM_BO_USE_SCANOUT |
> > +      GBM_BO_USE_SCANOUT_ROTATED_90_270)) != 0 &&
> >        format == GBM_FORMAT_XRGB8888;
> >     if (!is_cursor && !is_scanout) {
> >        errno = EINVAL;
> > @@ -880,6 +883,8 @@ gbm_dri_bo_create(struct gbm_device *gbm,
> >  
> >     if (usage & GBM_BO_USE_SCANOUT)
> >        dri_use |= __DRI_IMAGE_USE_SCANOUT;
> > +   if (usage & GBM_BO_USE_SCANOUT_ROTATED_90_270)
> > +      dri_use |= __DRI_IMAGE_USE_SCANOUT_ROTATED_90_270;
> >     if (usage & GBM_BO_USE_CURSOR)
> >        dri_use |= __DRI_IMAGE_USE_CURSOR;
> >     if (usage & GBM_BO_USE_LINEAR)
> > diff --git a/src/gbm/main/gbm.h b/src/gbm/main/gbm.h
> > index 2708e50..2ef7bd8 100644
> > --- a/src/gbm/main/gbm.h
> > +++ b/src/gbm/main/gbm.h
> > @@ -213,6 +213,11 @@ enum gbm_bo_flags {
> >      * Buffer is linear, i.e. not tiled.
> >      */
> >     GBM_BO_USE_LINEAR = (1 << 4),
> > +   /**
> > +    * Buffer would be rotated and some platforms have additional tiling
> > +    * requirements for 90/270 rotated buffers.
> > +    */
> > +   GBM_BO_USE_SCANOUT_ROTATED_90_270 = (1 << 5),
> >  };
> >  
> >  int
> > 
> 
> I asked internally, and apparently our display hardware requires a
> rotation specific tiling mode for 180 degree rotation as well. In order
> to avoid having to add *_SCANOUT_ROTATED_180 later, would
> *_SCANOUT_ROTATED work for you as well? Or would using Y-tiling for 180
> degree rotation be an issue?

What about a bit per angle? To avoid hardware specifics.

-- 
Ville Syrjälä
Intel OTC