In commit dacb11a585, Eric found the first
matching 565 pbuffer config, and stopped. Our double-buffered configs
come first in the list, so we added that, making a pbuffer-only config
that claimed to be double buffered. This doesn't make sense, since
pixmaps/pbuffers are fundamentally not double buffered.
When using that config, every call to eglCreatePbufferSurface would fail
with EGL_BAD_MATCH. The call chain looks like this:
- eglCreatePbufferSurface
- dri3_create_pbuffer_surface
- dri3_create_surface
- dri2_get_dri_config
which eventually does:
const bool double_buffer = surface_type == EGL_WINDOW_BIT;
and then fails to find a matching config, because it ends up looking
for a single-buffered config - and there aren't any.
To fix this, make the 565 pbuffer config single-buffered. This fixes
at least 51 dEQP-EGL.* tests.
Fixes: dacb11a585 ("egl: Add a 565 pbuffer-only EGL config under X11.")
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
6ad31c4ff3