egl: Make the 565 pbuffer-only config single buffered.
In commit dacb11a5, 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: dacb11a5 ("egl: Add a 565 pbuffer-only EGL config under X11.") Reviewed-by: Eric Engestrom <email@example.com> Reviewed-by: Eric Anholt <firstname.lastname@example.org>
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