framebufferOrigin property
Where row zero of a render target is.
Asked because a shader sampling a texture the engine drew has to be told:
see toFramebufferOrigin. The engine's own frames are presented and read
back consistently by each backend, so this is not about the picture — it
is about the maps the lighting pass looks into.
Implementation
@override
FramebufferOrigin get framebufferOrigin => inner.framebufferOrigin;