Add TextureFormat::Rg16Unorm support for Image and derive Resource fo…

…r SpecializedComputePipelines (#5991)

# Objective

Currently some TextureFormats are not supported by the Image type.
The `TextureFormat::Rg16Unorm` format is useful for storing minmax heightmaps.
Similar to #5249 I now additionally require image to support the dual channel variant.

## Solution

Added `TextureFormat::Rg16Unorm` support to Image.

Additionally this PR derives `Resource` for `SpecializedComputePipelines`, because for some reason this was missing.
All other special pipelines do derive `Resource` already.


Co-authored-by: Kurt Kühnert <51823519+Ku95@users.noreply.github.com>

crates/bevy_render/src/render_resource/pipeline_specializer.rs

@@ -49,6 +49,7 @@ pub trait SpecializedComputePipeline {
     fn specialize(&self, key: Self::Key) -> ComputePipelineDescriptor;
 }
 
+#[derive(Resource)]
 pub struct SpecializedComputePipelines<S: SpecializedComputePipeline> {
     cache: HashMap<S::Key, CachedComputePipelineId>,
 }

crates/bevy_render/src/texture/image.rs

@@ -539,9 +539,10 @@ impl TextureFormatPixelInfo for TextureFormat {
             TextureFormat::R16Uint
             | TextureFormat::R16Sint
             | TextureFormat::R16Float
+            | TextureFormat::R16Unorm
             | TextureFormat::Rg16Uint
             | TextureFormat::Rg16Sint
-            | TextureFormat::R16Unorm
+            | TextureFormat::Rg16Unorm
             | TextureFormat::Rg16Float
             | TextureFormat::Rgba16Uint
             | TextureFormat::Rgba16Sint
@@ -587,6 +588,7 @@ impl TextureFormatPixelInfo for TextureFormat {
             | TextureFormat::Rg8Sint
             | TextureFormat::Rg16Uint
             | TextureFormat::Rg16Sint
+            | TextureFormat::Rg16Unorm
             | TextureFormat::Rg16Float
             | TextureFormat::Rg32Uint
             | TextureFormat::Rg32Sint