Function: gpuSettingsForRender()
gpuSettingsForRender():
GpuSettings|undefined
The GPU settings that a render applies, or undefined when final
downsampling is off or CPU rendering is on. Then no preset applies, and a
volume renders as in 4.x: the presets describe WebGL GPU limits, not CPU
memory. Every render path reads the settings here, so that one check covers
them all.
Returns
GpuSettings | undefined