Get the Metal command encoder for the current frame.
This function returns void *, so SDL doesn't have to include Metal's
headers, but it can be safely cast to an id<MTLRenderCommandEncoder>.
This will return null if Metal refuses to give SDL a drawable to render
to, which might happen if the window is hidden/minimized/offscreen. This
doesn't apply to command encoders for render targets, just the window's
backbuffer. Check your return values!
Get the Metal command encoder for the current frame.
This function returns void *, so SDL doesn't have to include Metal's headers, but it can be safely cast to an id<MTLRenderCommandEncoder>.
This will return null if Metal refuses to give SDL a drawable to render to, which might happen if the window is hidden/minimized/offscreen. This doesn't apply to command encoders for render targets, just the window's backbuffer. Check your return values!