egl/wayland: Implement DRI_PRIME support

When the server gpu and requested gpu are different:
. They likely don't support the same tiling modes
. They likely do not have fast access to the same locations

Thus we do:
. render to a tiled buffer we do not share with the server
. Copy the content at every swap to a buffer with no tiling
that we share with the server.

This is similar to the glx dri3 DRI_PRIME implementation.

Reviewed-by: Dave Airlie <[email protected]>
Reviewed-by: Daniel Stone <[email protected]>

Signed-off-by: Axel Davy <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/egl/drivers/dri2/egl_dri2.h b/src/egl/drivers/dri2/egl_dri2.h
index 3ee3f806db8..cabeb2dfdc6 100644
--- a/src/egl/drivers/dri2/egl_dri2.h
+++ b/src/egl/drivers/dri2/egl_dri2.h
@@ -201,6 +201,7 @@ struct dri2_egl_display
    int			     formats;
    uint32_t                  capabilities;
    int			     is_render_node;
+   int			     is_different_gpu;
 #endif
 };
 
@@ -254,6 +255,8 @@ struct dri2_egl_surface
 #ifdef HAVE_WAYLAND_PLATFORM
       struct wl_buffer   *wl_buffer;
       __DRIimage         *dri_image;
+      /* for is_different_gpu case. NULL else */
+      __DRIimage         *linear_copy;
 #endif
 #ifdef HAVE_DRM_PLATFORM
       struct gbm_bo       *bo;