Realtime Environment Map Filtering Tracking Issue

[atlv24]

• re-generation control (via boolean that auto-resets on extract like TAA reset?)
• switch away from Rgba16Float to either Rgb9e5Float or Rg11b10Float, possibly with BC6H
• split out cubemap SPD for reuse?
• downsample resolution control to configure output resolution and filtering pass sample counts
• furnace test, fix energy preservation issue at the highest roughness (diffuse irradiance convolution), compare against ground truth to bring down the error bars.
• use subgroup ops in SPD when Upgrade to wgpu version 26.0 #19868 lands

[mate-h]

Follow up on:

• Shadows from sunlight when using environment map lighting (skybox); shadow-only lights #16278
• Implement omnidirectional cameras for real-time reflection probes. #13840
• Runtime generation of simple environment maps #17468

[janhohenheim]

Also important:

• Importing cube maps is hard #19125, which would be fixed by allowing Bevy to read HDRis and EXR files directly as cubemaps.

Otherwise, all of this fancy tech is not really usable for actual mortals :P