Metal does not support LOD bias for samplers

iOSxcOder · October 22, 2025, 12:38pm

Godot Version

4.5.1 Stable

Question

I got this message

  WARNING: drivers/metal/rendering_device_driver_metal.mm:771 - Metal does not support LOD bias for samplers.

Does it means I can’t use LOD on Mac OS ?

W 0:00:00:477   sampler_create: Metal does not support LOD bias for samplers.
  <C++ Source>  drivers/metal/rendering_device_driver_metal.mm:771 @ sampler_create()

github.com/godotengine/godot

drivers/metal/rendering_device_driver_metal.mm

f62fdbde1


      
          	desc.compareFunction = COMPARE_OPERATORS[p_state.compare_op];
          
          	desc.lodMinClamp = p_state.min_lod;
          	desc.lodMaxClamp = p_state.max_lod;
          
          	desc.borderColor = SAMPLER_BORDER_COLORS[p_state.border_color];
          
          	desc.normalizedCoordinates = !p_state.unnormalized_uvw;
          
          	if (p_state.lod_bias != 0.0) {
          		WARN_PRINT_ONCE("Metal does not support LOD bias for samplers.");
          	}
          
          	id<MTLSamplerState> obj = [device newSamplerStateWithDescriptor:desc];
          	ERR_FAIL_NULL_V_MSG(obj, SamplerID(), "newSamplerStateWithDescriptor failed");
          	return rid::make(obj);
          }
          
          void RenderingDeviceDriverMetal::sampler_free(SamplerID p_sampler) {
          	rid::release(p_sampler);
          }

pennyloafers · October 23, 2025, 1:15am

Doing some googling Apple seems to have added Lodbias in the iOS 26 release back in September, just about a month ago.

I took a peak on github issues and dont see anything. I think you could probably get them to implement it if you create an issue.

But since its just a warning it might work automatically? Although i would think the metal api would need to utilized for the new functionality.

iOSxcOder · October 23, 2025, 5:02am

I’m not sure if this be a metal 4 and Godot use currently 3.2

Bigger thing could be MetalFX Frame Interpolation , which would make experience closer to NVIDIA