1import bevy_core_pipeline::fullscreen_vertex_shader::FullscreenVertexOutput;
2import package::meshlet::bindings::InstancedOffset;
3
4@if(MESHLET_VISIBILITY_BUFFER_RASTER_PASS_OUTPUT)
5@group(0) @binding(0) var meshlet_visibility_buffer: texture_storage_2d<r64uint, read>;
6@else
7@group(0) @binding(0) var meshlet_visibility_buffer: texture_storage_2d<r32uint, read>;
8@group(0) @binding(1) var<storage, read> meshlet_raster_clusters: array<InstancedOffset>;  // Per cluster
9@group(0) @binding(2) var<storage, read> meshlet_instance_material_ids: array<u32>; // Per entity instance
10
11/// This pass writes out the depth texture.
12@fragment
13fn resolve_depth(in: FullscreenVertexOutput) -> @builtin(frag_depth) f32 {
14    let visibility = textureLoad(meshlet_visibility_buffer, vec2<u32>(in.position.xy)).r;
15    @if(MESHLET_VISIBILITY_BUFFER_RASTER_PASS_OUTPUT)
16    let depth = u32(visibility >> 32u);
17    @else
18    let depth = visibility;
19
20    if depth == 0u { discard; }
21
22    return bitcast<f32>(depth);
23}
24
25/// This pass writes out the material depth texture.
26@if(MESHLET_VISIBILITY_BUFFER_RASTER_PASS_OUTPUT)
27@fragment
28fn resolve_material_depth(in: FullscreenVertexOutput) -> @builtin(frag_depth) f32 {
29    let visibility = textureLoad(meshlet_visibility_buffer, vec2<u32>(in.position.xy)).r;
30
31    let depth = visibility >> 32u;
32    if depth == 0lu { discard; }
33
34    let cluster_id = u32(visibility) >> 7u;
35    let instance_id = meshlet_raster_clusters[cluster_id].instance_id;
36    let material_id = meshlet_instance_material_ids[instance_id];
37    return f32(material_id) / 65535.0;
38}