Function gvr_sys::gvr_buffer_viewport_set_source_uv

pub unsafe extern "C" fn gvr_buffer_viewport_set_source_uv(
    viewport: *mut gvr_buffer_viewport, 
    uv: gvr_rectf
)

Sets the UV coordinates specifying where the output buffer should be sampled when compositing the final distorted image.

@param viewport The buffer viewport. @param uv The new UV coordinates for sampling. The coordinates must be valid, that is, left <= right and bottom <= top. Otherwise an empty source region is set, which will result in no output for this viewport.