compact-aov-coordinated-activation

name	compact-aov-coordinated-activation
description	Activating compact storage formats (R16Float/Rg16Float) for denoiser AOVs requires coordinated BGL + WGSL + texture-format updates across writer and reader passes — change all in lockstep or the bind group will fail validation at runtime
source	auto-skill
extracted_at	2026-06-15T05:05:48.015Z

Compact AOV Coordinated Activation

When activating compact storage formats for denoiser AOVs (shading confidence, variance, moments, history confidence), every pass that writes to or reads from the texture must agree on the format. A mismatch panics at bind group creation.

The write side

For each AOV storage texture being compacted (e.g., R32Float → R16Float):

1. Rust BGL in the writer pass — change TextureFormat::R32Float to TextureFormat::R16Float in the BindGroupLayoutEntry for the storage binding.
2. WGSL in the writer shader — change the storage texture format from texture_storage_2d<r32float, write> to texture_storage_2d<r16float, write>.
3. Texture creation — the host-side texture allocator (typically in render_hook.rs) must create the texture with the matching format.

The read side

Sampled (non-storage) readers do NOT need BGL format changes — they bind with TextureSampleType::Float regardless of the underlying format. Only storage texture writers/readers that declare an explicit format need updating.

Files affected (Titan)

AOV	Writer	WGSL	BGL
shading_confidence	stratum_shading	stratum_shading.wgsl	stratum_shading.rs binding 5
variance_out	svgf_temporal	svgf_temporal.wgsl	svgf_temporal.rs binding 5
moments_curr	svgf_temporal	svgf_temporal.wgsl	svgf_temporal.rs binding 4
history_conf_curr	svgf_temporal	svgf_temporal.wgsl	svgf_temporal.rs binding 10
specular_moments	specular_temporal	stratum_specular_temporal.wgsl	specular_temporal.rs binding 4
specular_variance	specular_temporal	stratum_specular_temporal.wgsl	specular_temporal.rs binding 5

Validation

After changing all sites, rebuild and run the probe bench. A format mismatch produces a panic at Device::create_bind_group:

Storage texture binding N expects format = R32Float, but given a view with format = R16Float