bevy_render2/bevy_pbr2: Update to wgpu 0.9 / naga 0.5 (#19)

pipelined/bevy_pbr2/Cargo.toml

@@ -29,4 +29,4 @@ bitflags = "1.2"
 # direct dependency required for derive macro
 bytemuck = { version = "1", features = ["derive"] }
 crevice = { path = "../../crates/crevice" }
-wgpu = "0.8"
+wgpu = "0.9"

pipelined/bevy_pbr2/src/render/pbr.wgsl

@@ -356,7 +356,12 @@ fn fetch_shadow(light_id: i32, homogeneous_coords: vec4<f32>) -> f32 {
     // compute texture coordinates for shadow lookup
     let light_local = homogeneous_coords.xy * flip_correction * proj_correction + vec2<f32>(0.5, 0.5);
     // do the lookup, using HW PCF and comparison
-    return textureSampleCompare(shadow_textures, shadow_textures_sampler, light_local, i32(light_id), homogeneous_coords.z * proj_correction);
+    // NOTE: Due to the non-uniform control flow above, we must use the Level variant of
+    //       textureSampleCompare to avoid undefined behaviour due to some of the fragments in
+    //       a quad (2x2 fragments) being processed not being sampled, and this messing with
+    //       mip-mapping functionality. The shadow maps have no mipmaps so Level just samples
+    //       from LOD 0.
+    return textureSampleCompareLevel(shadow_textures, shadow_textures_sampler, light_local, i32(light_id), homogeneous_coords.z * proj_correction);
 }
 
 struct FragmentInput {

pipelined/bevy_render2/Cargo.toml

@@ -29,7 +29,7 @@ bevy_utils = { path = "../../crates/bevy_utils", version = "0.5.0" }
 image = { version = "0.23.12", default-features = false }
 
 # misc
-wgpu = "0.8"
+wgpu = "0.9"
 naga = { git = "https://github.com/gfx-rs/naga", rev = "0cf5484bba530f1134badbd2a1c1a8e9daf2e9c3", features = ["glsl-in", "spv-out", "spv-in", "wgsl-in"] }
 serde = { version = "1", features = ["derive"] }
 bitflags = "1.2.1"