Function build_user_shader_bind_group_layout 

pub(crate) fn build_user_shader_bind_group_layout(
    device: &Device,
    label: &str,
) -> BindGroupLayout

Build one of the four MD2 sampler variants used by sampler_{fw,fc,pw,pc}. MD2 encodes the choice into the sampler name: f/p = filter mode (filtered=linear vs point=nearest), w/c = address mode (wrap vs clamp-to-edge). Real preset authoring intent is matched per call site (sampler_pw_main = high-frequency point sample wrapped to texture boundary; sampler_fc_main = smooth bilinear sample clamped at edges). Build the bind-group layout user-translated shaders bind against.

Single source of truth for the 25 entries the codegen wrapper assumes: ShaderUniforms at binding(0), sampler_main_texture + sampler at 1/2, blur1/2/3 at 3/4/5, noise pack at 6..10, MD2 sampler variants at 11..14, eight user-texture slots at 15..22, and prev_main at 23. Both CompPipeline (default + user comp shaders) and the warp pipeline’s user-shader path call this so a future binding tweak only needs to land here.