KTX2: Support ASTC HDR (bevyengine#21886)

# Objective

ASTC HDR support is missing for ktx2 image loader.

## Solution

Add support for it.

## Testing

I compressed the `CircuitBoardLightmap.hdr` to astc_4x4_hdr and
bc6h_ufloat and made use of them in depth of field example. Tested on
Android and Linux desktop.

Author: beicause

crates/bevy_image/src/image.rs

@@ -1510,6 +1510,9 @@ impl Image {
         format_description
             .required_features()
             .contains(Features::TEXTURE_COMPRESSION_ASTC)
+            || format_description
+                .required_features()
+                .contains(Features::TEXTURE_COMPRESSION_ASTC_HDR)
             || format_description
                 .required_features()
                 .contains(Features::TEXTURE_COMPRESSION_BC)
@@ -2215,6 +2218,11 @@ bitflags::bitflags! {
         ///
         /// [ASTC Format Specification]: https://registry.khronos.org/DataFormat/specs/1.3/dataformat.1.3.html#ASTC
         const ASTC_LDR = 1 << 0;
+        /// Support for ASTC HDR textures.
+        ///
+        /// For more information see:
+        /// - [`Features::TEXTURE_COMPRESSION_ASTC_HDR`]
+        const ASTC_HDR = 1 << 1;
         /// Support for Block Compressed textures.
         ///
         /// For more information see:
@@ -2226,15 +2234,15 @@ bitflags::bitflags! {
         /// [S3TC Format Specification]: https://registry.khronos.org/DataFormat/specs/1.3/dataformat.1.3.html#S3TC
         /// [RGTC Format Specification]: https://registry.khronos.org/DataFormat/specs/1.3/dataformat.1.3.html#RGTC
         /// [BPTC Format Specification]: https://registry.khronos.org/DataFormat/specs/1.3/dataformat.1.3.html#BPTC
-        const BC       = 1 << 1;
+        const BC       = 1 << 2;
         /// Support for Ericsson Texture Compression.
         ///
         /// For more information see:
         /// - [`Features::TEXTURE_COMPRESSION_ETC2`]
         /// - [ETC2 Format Specification]
         ///
         /// [ETC2 Format Specification]: https://registry.khronos.org/DataFormat/specs/1.3/dataformat.1.3.html#ETC2
-        const ETC2     = 1 << 2;
+        const ETC2     = 1 << 3;
     }
 }
 
@@ -2245,6 +2253,9 @@ impl CompressedImageFormats {
         if features.contains(Features::TEXTURE_COMPRESSION_ASTC) {
             supported_compressed_formats |= Self::ASTC_LDR;
         }
+        if features.contains(Features::TEXTURE_COMPRESSION_ASTC_HDR) {
+            supported_compressed_formats |= Self::ASTC_HDR;
+        }
         if features.contains(Features::TEXTURE_COMPRESSION_BC) {
             supported_compressed_formats |= Self::BC;
         }
@@ -2284,6 +2295,10 @@ impl CompressedImageFormats {
             | TextureFormat::EacR11Snorm
             | TextureFormat::EacRg11Unorm
             | TextureFormat::EacRg11Snorm => self.contains(CompressedImageFormats::ETC2),
+            TextureFormat::Astc {
+                channel: wgpu_types::AstcChannel::Hdr,
+                ..
+            } => self.contains(CompressedImageFormats::ASTC_HDR),
             TextureFormat::Astc { .. } => self.contains(CompressedImageFormats::ASTC_LDR),
             _ => true,
         }

crates/bevy_image/src/ktx2.rs

@@ -1499,6 +1499,62 @@ pub fn ktx2_format_to_texture_format(
                 },
             }
         }
+        ktx2::Format::ASTC_4x4_SFLOAT_BLOCK => TextureFormat::Astc {
+            block: AstcBlock::B4x4,
+            channel: AstcChannel::Hdr,
+        },
+        ktx2::Format::ASTC_5x4_SFLOAT_BLOCK => TextureFormat::Astc {
+            block: AstcBlock::B5x4,
+            channel: AstcChannel::Hdr,
+        },
+        ktx2::Format::ASTC_5x5_SFLOAT_BLOCK => TextureFormat::Astc {
+            block: AstcBlock::B5x5,
+            channel: AstcChannel::Hdr,
+        },
+        ktx2::Format::ASTC_6x5_SFLOAT_BLOCK => TextureFormat::Astc {
+            block: AstcBlock::B6x5,
+            channel: AstcChannel::Hdr,
+        },
+        ktx2::Format::ASTC_6x6_SFLOAT_BLOCK => TextureFormat::Astc {
+            block: AstcBlock::B6x6,
+            channel: AstcChannel::Hdr,
+        },
+        ktx2::Format::ASTC_8x5_SFLOAT_BLOCK => TextureFormat::Astc {
+            block: AstcBlock::B8x5,
+            channel: AstcChannel::Hdr,
+        },
+        ktx2::Format::ASTC_8x6_SFLOAT_BLOCK => TextureFormat::Astc {
+            block: AstcBlock::B8x6,
+            channel: AstcChannel::Hdr,
+        },
+        ktx2::Format::ASTC_8x8_SFLOAT_BLOCK => TextureFormat::Astc {
+            block: AstcBlock::B8x8,
+            channel: AstcChannel::Hdr,
+        },
+        ktx2::Format::ASTC_10x5_SFLOAT_BLOCK => TextureFormat::Astc {
+            block: AstcBlock::B10x5,
+            channel: AstcChannel::Hdr,
+        },
+        ktx2::Format::ASTC_10x6_SFLOAT_BLOCK => TextureFormat::Astc {
+            block: AstcBlock::B10x6,
+            channel: AstcChannel::Hdr,
+        },
+        ktx2::Format::ASTC_10x8_SFLOAT_BLOCK => TextureFormat::Astc {
+            block: AstcBlock::B10x8,
+            channel: AstcChannel::Hdr,
+        },
+        ktx2::Format::ASTC_10x10_SFLOAT_BLOCK => TextureFormat::Astc {
+            block: AstcBlock::B10x10,
+            channel: AstcChannel::Hdr,
+        },
+        ktx2::Format::ASTC_12x10_SFLOAT_BLOCK => TextureFormat::Astc {
+            block: AstcBlock::B12x10,
+            channel: AstcChannel::Hdr,
+        },
+        ktx2::Format::ASTC_12x12_SFLOAT_BLOCK => TextureFormat::Astc {
+            block: AstcBlock::B12x12,
+            channel: AstcChannel::Hdr,
+        },
         _ => {
             return Err(TextureError::UnsupportedTextureFormat(format!(
                 "{ktx2_format:?}"