KTX2Loader: Support RGB9E5 (#31611)

Author: donmccurdy

examples/jsm/loaders/KTX2Loader.js

@@ -26,10 +26,12 @@ import {
 	RGB_ETC2_Format,
 	RGB_PVRTC_4BPPV1_Format,
 	RGB_S3TC_DXT1_Format,
+	RGBFormat,
 	RGFormat,
 	RedFormat,
 	SRGBColorSpace,
-	UnsignedByteType
+	UnsignedByteType,
+	UnsignedInt5999Type
 } from 'three';
 import { WorkerPool } from '../utils/WorkerPool.js';
 import {
@@ -70,6 +72,7 @@ import {
 	VK_FORMAT_R8G8_UNORM,
 	VK_FORMAT_R8_SRGB,
 	VK_FORMAT_R8_UNORM,
+	VK_FORMAT_E5B9G9R9_UFLOAT_PACK32,
 	VK_FORMAT_UNDEFINED
 } from '../libs/ktx-parse.module.js';
 import { ZSTDDecoder } from '../libs/zstddec.module.js';
@@ -918,7 +921,7 @@ KTX2Loader.BasisWorker = function () {
 // Parsing for non-Basis textures. These textures may have supercompression
 // like Zstd, but they do not require transcoding.
 
-const UNCOMPRESSED_FORMATS = new Set( [ RGBAFormat, RGFormat, RedFormat ] );
+const UNCOMPRESSED_FORMATS = new Set( [ RGBAFormat, RGBFormat, RGFormat, RedFormat ] );
 
 const FORMAT_MAP = {
 
@@ -937,6 +940,8 @@ const FORMAT_MAP = {
 	[ VK_FORMAT_R8_SRGB ]: RedFormat,
 	[ VK_FORMAT_R8_UNORM ]: RedFormat,
 
+	[ VK_FORMAT_E5B9G9R9_UFLOAT_PACK32 ]: RGBFormat,
+
 	[ VK_FORMAT_ETC2_R8G8B8_SRGB_BLOCK ]: RGB_ETC2_Format,
 	[ VK_FORMAT_ETC2_R8G8B8A8_SRGB_BLOCK ]: RGBA_ETC2_EAC_Format,
 
@@ -979,6 +984,8 @@ const TYPE_MAP = {
 	[ VK_FORMAT_R8_SRGB ]: UnsignedByteType,
 	[ VK_FORMAT_R8_UNORM ]: UnsignedByteType,
 
+	[ VK_FORMAT_E5B9G9R9_UFLOAT_PACK32 ]: UnsignedInt5999Type,
+
 	[ VK_FORMAT_ETC2_R8G8B8_SRGB_BLOCK ]: UnsignedByteType,
 	[ VK_FORMAT_ETC2_R8G8B8A8_SRGB_BLOCK ]: UnsignedByteType,
 
@@ -1071,6 +1078,16 @@ async function createRawTexture( container ) {
 
 			);
 
+		} else if ( TYPE_MAP[ vkFormat ] === UnsignedInt5999Type ) {
+
+			data = new Uint32Array(
+
+				levelData.buffer,
+				levelData.byteOffset,
+				levelData.byteLength / Uint32Array.BYTES_PER_ELEMENT
+
+			);
+
 		} else {
 
 			data = levelData;

examples/textures/ktx2/2d_rgb9e5_linear.ktx2

@@ -100,6 +100,7 @@
 						{ path: '2d_rgba8_linear.ktx2' },
 						{ path: '2d_rgba16_linear.ktx2' },
 						{ path: '2d_rgba32_linear.ktx2' },
+						{ path: '2d_rgb9e5_linear.ktx2' },
 					]
 				},
 				{