This commit ensures that we set the appropriate draw buffer when making
a context current. Mesa drivers enforce opengl ES semantics where the
targets passed to eglMakeCurrent are bound, but nvidia instead ignores
these parameters after the 1st eglMakeCurrent. In obs we make current
with EGL_NO_SURFACE so our draw targets end up as EGL_NONE on nvidia
and previews fail to render.
This also allows us to fail back ignoring NATIVE_RENDERABLE
requirements. Nvidia driver does not report support for this attribute
on any context and after resolving the draw target issues previews
render correctly on nvidia and intel drivers.
This adds the drmbuf format as a parameter separate from the obs texture
format that will be used. drmbuf's may have a variety of formats that we
need to pass correctly to get a usable texture which may correspond to
multi-platform texture formats.
Implement device_texture_create_from_dmabuf for EGL/X11 and EGL/Wayland.
The code is shared between them, in a new gl-egl-common.c file.
This is currently limited to a few common RGB(A) formats for now, which
seems to cover most use cases.
DMA-BUF is a widespread Linux buffer sharing mechanism. It is what's
commonly used zero-copy screen sharing by Wayland compositors.
Add a new 'device_texture_create_from_dmabuf' vfunc to gs_exports,
and stub implementations to libobs-opengl. Add a new public method
gs_texture_create_from_dmabuf() that calls this vfunc.
