When sharing DMA-BUFs it is required the announce the underlying
hardware capabilities via supported modifiers.
Add new device_query_dmabuf_capabilities vfunc to gs_exports and connect it
to the egl implementation stubs in the supported render platforms. Add a new
public method gs_query_dmabuf_capabilities() that calls the vfunc above.
Add new device_query_dmabuf_modifiers vfunc to gs_exports and connect it
to the egl implementation in the supported render platforms. Add a new
public method gs_query_dmabuf_modifiers() that calls the vfunc above.
The gs_texture_create_from_dmabuf function is a wrapper for
eglCreateImageKHR, which can set a different modifier for each plane.
The documentation should advice against that, since this should be
rejected by the driver.
While DMA-BUFs started to have one modifier per plane, this decision was
rolled back to having one modifier for the whole buffer / all planes.
While some apis like EGL were designed with a modifier per plane,
drivers are expected to reject any request using different modifiers per
plane.
