From b053182c3ceb4dbde997ebfda3e70d1a7351f381 Mon Sep 17 00:00:00 2001
From: Ignacio Castano <castano@ludicon.com>
Date: Tue, 18 Nov 2025 15:19:18 -0800
Subject: [PATCH 01/11] Add EAC formats.

---
 src/constants.js | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/src/constants.js b/src/constants.js
index 100bf0a5b4b3dd..64e174108093b0 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -907,6 +907,38 @@ export const RGB_ETC2_Format = 37492;
  */
 export const RGBA_ETC2_EAC_Format = 37496;
 
+/**
+ * EAC R11 UNORM format.
+ *
+ * @type {number}
+ * @constant
+ */
+export const R11_UNORM_EAC_Format = 37488; // 0x9270
+
+/**
+ * EAC R11 SNORM format.
+ *
+ * @type {number}
+ * @constant
+ */
+export const R11_SNORM_EAC_Format = 37489; // 0x9271
+
+/**
+ * EAC RG11 UNORM format.
+ *
+ * @type {number}
+ * @constant
+ */
+export const RG11_UNORM_EAC_Format = 37490; // 0x9272
+
+/**
+ * EAC RG11 SNORM format.
+ *
+ * @type {number}
+ * @constant
+ */
+export const RG11_SNORM_EAC_Format = 37491; // 0x9273
+
 /**
  * ASTC RGBA 4x4 format.
  *

From 8af664f091bf2206c340a2458923c42250b1b77c Mon Sep 17 00:00:00 2001
From: Ignacio Castano <castano@ludicon.com>
Date: Tue, 18 Nov 2025 15:19:41 -0800
Subject: [PATCH 02/11] Handle new EAC formats in getByteLength

---
 src/extras/TextureUtils.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/extras/TextureUtils.js b/src/extras/TextureUtils.js
index ce1705e613f011..460621b40dec53 100644
--- a/src/extras/TextureUtils.js
+++ b/src/extras/TextureUtils.js
@@ -1,4 +1,4 @@
-import { AlphaFormat, RedFormat, RedIntegerFormat, RGFormat, RGIntegerFormat, RGBFormat, RGBAFormat, RGBAIntegerFormat, RGB_S3TC_DXT1_Format, RGBA_S3TC_DXT1_Format, RGBA_S3TC_DXT3_Format, RGBA_S3TC_DXT5_Format, RGB_PVRTC_2BPPV1_Format, RGBA_PVRTC_2BPPV1_Format, RGB_PVRTC_4BPPV1_Format, RGBA_PVRTC_4BPPV1_Format, RGB_ETC1_Format, RGB_ETC2_Format, RGBA_ETC2_EAC_Format, RGBA_ASTC_4x4_Format, RGBA_ASTC_5x4_Format, RGBA_ASTC_5x5_Format, RGBA_ASTC_6x5_Format, RGBA_ASTC_6x6_Format, RGBA_ASTC_8x5_Format, RGBA_ASTC_8x6_Format, RGBA_ASTC_8x8_Format, RGBA_ASTC_10x5_Format, RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_10x10_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, RGBA_BPTC_Format, RGB_BPTC_SIGNED_Format, RGB_BPTC_UNSIGNED_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format, UnsignedByteType, ByteType, UnsignedShortType, ShortType, HalfFloatType, UnsignedShort4444Type, UnsignedShort5551Type, UnsignedIntType, IntType, FloatType, UnsignedInt5999Type, UnsignedInt101111Type } from '../constants.js';
+import { AlphaFormat, RedFormat, RedIntegerFormat, RGFormat, RGIntegerFormat, RGBFormat, RGBAFormat, RGBAIntegerFormat, RGB_S3TC_DXT1_Format, RGBA_S3TC_DXT1_Format, RGBA_S3TC_DXT3_Format, RGBA_S3TC_DXT5_Format, RGB_PVRTC_2BPPV1_Format, RGBA_PVRTC_2BPPV1_Format, RGB_PVRTC_4BPPV1_Format, RGBA_PVRTC_4BPPV1_Format, RGB_ETC1_Format, RGB_ETC2_Format, RGBA_ETC2_EAC_Format, R11_UNORM_EAC_Format, R11_SNORM_EAC_Format, RG11_UNORM_EAC_Format, RG11_SNORM_EAC_Format, RGBA_ASTC_4x4_Format, RGBA_ASTC_5x4_Format, RGBA_ASTC_5x5_Format, RGBA_ASTC_6x5_Format, RGBA_ASTC_6x6_Format, RGBA_ASTC_8x5_Format, RGBA_ASTC_8x6_Format, RGBA_ASTC_8x8_Format, RGBA_ASTC_10x5_Format, RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_10x10_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, RGBA_BPTC_Format, RGB_BPTC_SIGNED_Format, RGB_BPTC_UNSIGNED_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format, UnsignedByteType, ByteType, UnsignedShortType, ShortType, HalfFloatType, UnsignedShort4444Type, UnsignedShort5551Type, UnsignedIntType, IntType, FloatType, UnsignedInt5999Type, UnsignedInt101111Type } from '../constants.js';
 
 /**
  * Scales the texture as large as possible within its surface without cropping
@@ -140,8 +140,12 @@ function getByteLength( width, height, format, type ) {
 		// https://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_etc/
 		case RGB_ETC1_Format:
 		case RGB_ETC2_Format:
+		case R11_UNORM_EAC_Format:
+		case R11_SNORM_EAC_Format:
 			return Math.floor( ( width + 3 ) / 4 ) * Math.floor( ( height + 3 ) / 4 ) * 8;
 		case RGBA_ETC2_EAC_Format:
+		case RG11_UNORM_EAC_Format:
+		case RG11_SNORM_EAC_Format:
 			return Math.floor( ( width + 3 ) / 4 ) * Math.floor( ( height + 3 ) / 4 ) * 16;
 
 		// https://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_astc/

From d80d292815db697694b212163dc88e728d282363 Mon Sep 17 00:00:00 2001
From: Ignacio Castano <castano@ludicon.com>
Date: Tue, 18 Nov 2025 15:20:02 -0800
Subject: [PATCH 03/11] Add support for EAC formats in WebGPU backend.

---
 .../webgpu/utils/WebGPUTextureUtils.js        | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/renderers/webgpu/utils/WebGPUTextureUtils.js b/src/renderers/webgpu/utils/WebGPUTextureUtils.js
index 4b449a60e65fba..b2995c418cd321 100644
--- a/src/renderers/webgpu/utils/WebGPUTextureUtils.js
+++ b/src/renderers/webgpu/utils/WebGPUTextureUtils.js
@@ -14,7 +14,8 @@ import {
 	RGBA_ASTC_4x4_Format, RGBA_ASTC_5x4_Format, RGBA_ASTC_5x5_Format, RGBA_ASTC_6x5_Format, RGBA_ASTC_6x6_Format, RGBA_ASTC_8x5_Format, RGBA_ASTC_8x6_Format, RGBA_ASTC_8x8_Format, RGBA_ASTC_10x5_Format,
 	RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_10x10_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, UnsignedIntType, UnsignedShortType, UnsignedInt248Type, UnsignedInt5999Type,
 	NeverCompare, AlwaysCompare, LessCompare, LessEqualCompare, EqualCompare, GreaterEqualCompare, GreaterCompare, NotEqualCompare, IntType, RedIntegerFormat, RGIntegerFormat, RGBAIntegerFormat,
-	UnsignedInt101111Type, RGBA_BPTC_Format, RGB_ETC1_Format, RGB_S3TC_DXT1_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format
+	UnsignedInt101111Type, RGBA_BPTC_Format, RGB_ETC1_Format, RGB_S3TC_DXT1_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format,
+	R11_UNORM_EAC_Format, R11_SNORM_EAC_Format, RG11_UNORM_EAC_Format, RG11_SNORM_EAC_Format,
 } from '../../../constants.js';
 import { CubeTexture } from '../../../textures/CubeTexture.js';
 import { Texture } from '../../../textures/Texture.js';
@@ -1239,6 +1240,22 @@ export function getFormat( texture, device = null ) {
 				formatGPU = ( transfer === SRGBTransfer ) ? GPUTextureFormat.ETC2RGBA8UnormSRGB : GPUTextureFormat.ETC2RGBA8Unorm;
 				break;
 
+			case R11_UNORM_EAC_Format:
+				formatGPU = GPUTextureFormat.EACR11Unorm;
+				break;
+
+			case R11_SNORM_EAC_Format:
+				formatGPU = GPUTextureFormat.EACR11Snorm;
+				break;
+
+			case RG11_UNORM_EAC_Format:
+				formatGPU = GPUTextureFormat.EACRG11Unorm;
+				break;
+
+			case RG11_SNORM_EAC_Format:
+				formatGPU = GPUTextureFormat.EACRG11Snorm;
+				break;
+
 			case RGBA_ASTC_4x4_Format:
 				formatGPU = ( transfer === SRGBTransfer ) ? GPUTextureFormat.ASTC4x4UnormSRGB : GPUTextureFormat.ASTC4x4Unorm;
 				break;

From 65b69830876f05ef618da622445e14605631123f Mon Sep 17 00:00:00 2001
From: Ignacio Castano <castano@ludicon.com>
Date: Tue, 18 Nov 2025 15:20:19 -0800
Subject: [PATCH 04/11] Add support for EAC formats in KTX2Loader.

---
 examples/jsm/loaders/KTX2Loader.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/examples/jsm/loaders/KTX2Loader.js b/examples/jsm/loaders/KTX2Loader.js
index 8486bf81339b0d..2339a855229a90 100644
--- a/examples/jsm/loaders/KTX2Loader.js
+++ b/examples/jsm/loaders/KTX2Loader.js
@@ -20,6 +20,8 @@ import {
 	RGBA_BPTC_Format,
 	RGBA_S3TC_DXT3_Format,
 	RGBA_ETC2_EAC_Format,
+	R11_UNORM_EAC_Format,
+	RG11_UNORM_EAC_Format
 	RGBA_PVRTC_4BPPV1_Format,
 	RGBA_PVRTC_2BPPV1_Format,
 	RGBA_S3TC_DXT1_Format,
@@ -71,6 +73,8 @@ import {
 	VK_FORMAT_BC7_UNORM_BLOCK,
 	VK_FORMAT_ETC2_R8G8B8_SRGB_BLOCK,
 	VK_FORMAT_ETC2_R8G8B8A8_SRGB_BLOCK,
+	VK_FORMAT_EAC_R11_UNORM_BLOCK,
+	VK_FORMAT_EAC_R11G11_UNORM_BLOCK,
 	VK_FORMAT_PVRTC1_4BPP_SRGB_BLOCK_IMG,
 	VK_FORMAT_PVRTC1_4BPP_UNORM_BLOCK_IMG,
 	VK_FORMAT_PVRTC1_2BPP_SRGB_BLOCK_IMG,
@@ -968,6 +972,10 @@ const FORMAT_MAP = {
 
 	[ VK_FORMAT_ETC2_R8G8B8A8_SRGB_BLOCK ]: RGBA_ETC2_EAC_Format,
 	[ VK_FORMAT_ETC2_R8G8B8_SRGB_BLOCK ]: RGB_ETC2_Format,
+	[ VK_FORMAT_EAC_R11_UNORM_BLOCK ]: R11_UNORM_EAC_Format,
+	[ VK_FORMAT_EAC_R11_SNORM_BLOCK ]: R11_SNORM_EAC_Format,
+	[ VK_FORMAT_EAC_R11G11_UNORM_BLOCK ]: RG11_UNORM_EAC_Format,
+	[ VK_FORMAT_EAC_R11G11_SNORM_BLOCK ]: RG11_SNORM_EAC_Format,
 
 	[ VK_FORMAT_ASTC_4x4_SFLOAT_BLOCK_EXT ]: RGBA_ASTC_4x4_Format,
 	[ VK_FORMAT_ASTC_4x4_SRGB_BLOCK ]: RGBA_ASTC_4x4_Format,
@@ -1022,6 +1030,10 @@ const TYPE_MAP = {
 
 	[ VK_FORMAT_ETC2_R8G8B8A8_SRGB_BLOCK ]: UnsignedByteType,
 	[ VK_FORMAT_ETC2_R8G8B8_SRGB_BLOCK ]: UnsignedByteType,
+	[ VK_FORMAT_EAC_R11_UNORM_BLOCK ]: UnsignedByteType,
+	[ VK_FORMAT_EAC_R11_UNORM_BLOCK ]: UnsignedByteType,
+	[ VK_FORMAT_EAC_R11G11_UNORM_BLOCK ]: UnsignedByteType,
+	[ VK_FORMAT_EAC_R11G11_UNORM_BLOCK ]: UnsignedByteType,
 
 	[ VK_FORMAT_ASTC_4x4_SFLOAT_BLOCK_EXT ]: HalfFloatType,
 	[ VK_FORMAT_ASTC_4x4_SRGB_BLOCK ]: UnsignedByteType,

From 4348cb63e6457f526eef9e635b6b5138d10ada9d Mon Sep 17 00:00:00 2001
From: Ignacio Castano <castano@ludicon.com>
Date: Tue, 18 Nov 2025 15:21:08 -0800
Subject: [PATCH 05/11] Automatically select normal RG packing for EAC_RG
 textures in normal map nodes.

---
 src/nodes/accessors/MaterialNode.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/nodes/accessors/MaterialNode.js b/src/nodes/accessors/MaterialNode.js
index e813d998b6aa7a..57fa61e9486bce 100644
--- a/src/nodes/accessors/MaterialNode.js
+++ b/src/nodes/accessors/MaterialNode.js
@@ -7,7 +7,7 @@ import { uniform } from '../core/UniformNode.js';
 import { normalMap } from '../display/NormalMapNode.js';
 import { bumpMap } from '../display/BumpMapNode.js';
 import { Vector2 } from '../../math/Vector2.js';
-import { RGFormat, RED_GREEN_RGTC2_Format, NormalRGPacking } from '../../constants.js';
+import { RGFormat, RED_GREEN_RGTC2_Format, RG11_UNORM_EAC_Format, NormalRGPacking } from '../../constants.js';
 
 
 const _propertyCache = new Map();
@@ -237,7 +237,7 @@ class MaterialNode extends Node {
 				node = normalMap( this.getTexture( 'normal' ), this.getCache( 'normalScale', 'vec2' ) );
 				node.normalMapType = material.normalMapType;
 
-				if ( material.normalMap.format == RGFormat || material.normalMap.format == RED_GREEN_RGTC2_Format ) {
+				if ( material.normalMap.format == RGFormat || material.normalMap.format == RED_GREEN_RGTC2_Format || material.normalMap.format == RG11_UNORM_EAC_Format ) {
 
 					node.unpackNormalMode = NormalRGPacking;
 

From 40b442696ea4622518dac99206d2a228453fcd0a Mon Sep 17 00:00:00 2001
From: Ignacio Castano <castano@ludicon.com>
Date: Tue, 18 Nov 2025 15:40:13 -0800
Subject: [PATCH 06/11] Fix missing comma.

---
 examples/jsm/loaders/KTX2Loader.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/jsm/loaders/KTX2Loader.js b/examples/jsm/loaders/KTX2Loader.js
index 2339a855229a90..12dd1da62b3aa3 100644
--- a/examples/jsm/loaders/KTX2Loader.js
+++ b/examples/jsm/loaders/KTX2Loader.js
@@ -21,7 +21,7 @@ import {
 	RGBA_S3TC_DXT3_Format,
 	RGBA_ETC2_EAC_Format,
 	R11_UNORM_EAC_Format,
-	RG11_UNORM_EAC_Format
+	RG11_UNORM_EAC_Format,
 	RGBA_PVRTC_4BPPV1_Format,
 	RGBA_PVRTC_2BPPV1_Format,
 	RGBA_S3TC_DXT1_Format,

From 31e0469a63b981d51fee71ab7a5940ece071d8a1 Mon Sep 17 00:00:00 2001
From: Ignacio Castano <castano@ludicon.com>
Date: Tue, 18 Nov 2025 16:27:36 -0800
Subject: [PATCH 07/11] Add missing imports.

---
 examples/jsm/loaders/KTX2Loader.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/examples/jsm/loaders/KTX2Loader.js b/examples/jsm/loaders/KTX2Loader.js
index 12dd1da62b3aa3..125d24cf9a6839 100644
--- a/examples/jsm/loaders/KTX2Loader.js
+++ b/examples/jsm/loaders/KTX2Loader.js
@@ -21,7 +21,9 @@ import {
 	RGBA_S3TC_DXT3_Format,
 	RGBA_ETC2_EAC_Format,
 	R11_UNORM_EAC_Format,
+	R11_SNORM_EAC_Format,
 	RG11_UNORM_EAC_Format,
+	RG11_SNORM_EAC_Format,
 	RGBA_PVRTC_4BPPV1_Format,
 	RGBA_PVRTC_2BPPV1_Format,
 	RGBA_S3TC_DXT1_Format,
@@ -74,7 +76,9 @@ import {
 	VK_FORMAT_ETC2_R8G8B8_SRGB_BLOCK,
 	VK_FORMAT_ETC2_R8G8B8A8_SRGB_BLOCK,
 	VK_FORMAT_EAC_R11_UNORM_BLOCK,
+	VK_FORMAT_EAC_R11_SNORM_BLOCK,
 	VK_FORMAT_EAC_R11G11_UNORM_BLOCK,
+	VK_FORMAT_EAC_R11G11_SNORM_BLOCK,
 	VK_FORMAT_PVRTC1_4BPP_SRGB_BLOCK_IMG,
 	VK_FORMAT_PVRTC1_4BPP_UNORM_BLOCK_IMG,
 	VK_FORMAT_PVRTC1_2BPP_SRGB_BLOCK_IMG,

From b1140cade9f28a9b20855e94f85901068e89186f Mon Sep 17 00:00:00 2001
From: Ignacio Castano <castano@ludicon.com>
Date: Wed, 19 Nov 2025 20:13:29 -0800
Subject: [PATCH 08/11] Rename format enums to follow prior convention.

---
 examples/jsm/loaders/KTX2Loader.js               | 16 ++++++++--------
 src/constants.js                                 |  8 ++++----
 src/extras/TextureUtils.js                       | 10 +++++-----
 src/nodes/accessors/MaterialNode.js              |  4 ++--
 src/renderers/webgpu/utils/WebGPUTextureUtils.js | 10 +++++-----
 5 files changed, 24 insertions(+), 24 deletions(-)

diff --git a/examples/jsm/loaders/KTX2Loader.js b/examples/jsm/loaders/KTX2Loader.js
index 125d24cf9a6839..39c8f87bd21a6d 100644
--- a/examples/jsm/loaders/KTX2Loader.js
+++ b/examples/jsm/loaders/KTX2Loader.js
@@ -20,10 +20,10 @@ import {
 	RGBA_BPTC_Format,
 	RGBA_S3TC_DXT3_Format,
 	RGBA_ETC2_EAC_Format,
-	R11_UNORM_EAC_Format,
-	R11_SNORM_EAC_Format,
-	RG11_UNORM_EAC_Format,
-	RG11_SNORM_EAC_Format,
+	R11_EAC_Format,
+	R11_SIGNED_EAC_Format,
+	RG11_EAC_Format,
+	RG11_SIGNED_EAC_Format,
 	RGBA_PVRTC_4BPPV1_Format,
 	RGBA_PVRTC_2BPPV1_Format,
 	RGBA_S3TC_DXT1_Format,
@@ -976,10 +976,10 @@ const FORMAT_MAP = {
 
 	[ VK_FORMAT_ETC2_R8G8B8A8_SRGB_BLOCK ]: RGBA_ETC2_EAC_Format,
 	[ VK_FORMAT_ETC2_R8G8B8_SRGB_BLOCK ]: RGB_ETC2_Format,
-	[ VK_FORMAT_EAC_R11_UNORM_BLOCK ]: R11_UNORM_EAC_Format,
-	[ VK_FORMAT_EAC_R11_SNORM_BLOCK ]: R11_SNORM_EAC_Format,
-	[ VK_FORMAT_EAC_R11G11_UNORM_BLOCK ]: RG11_UNORM_EAC_Format,
-	[ VK_FORMAT_EAC_R11G11_SNORM_BLOCK ]: RG11_SNORM_EAC_Format,
+	[ VK_FORMAT_EAC_R11_UNORM_BLOCK ]: R11_EAC_Format,
+	[ VK_FORMAT_EAC_R11_SNORM_BLOCK ]: R11_SIGNED_EAC_Format,
+	[ VK_FORMAT_EAC_R11G11_UNORM_BLOCK ]: RG11_EAC_Format,
+	[ VK_FORMAT_EAC_R11G11_SNORM_BLOCK ]: RG11_SIGNED_EAC_Format,
 
 	[ VK_FORMAT_ASTC_4x4_SFLOAT_BLOCK_EXT ]: RGBA_ASTC_4x4_Format,
 	[ VK_FORMAT_ASTC_4x4_SRGB_BLOCK ]: RGBA_ASTC_4x4_Format,
diff --git a/src/constants.js b/src/constants.js
index 64e174108093b0..dd132a8e3a1266 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -913,7 +913,7 @@ export const RGBA_ETC2_EAC_Format = 37496;
  * @type {number}
  * @constant
  */
-export const R11_UNORM_EAC_Format = 37488; // 0x9270
+export const R11_EAC_Format = 37488; // 0x9270
 
 /**
  * EAC R11 SNORM format.
@@ -921,7 +921,7 @@ export const R11_UNORM_EAC_Format = 37488; // 0x9270
  * @type {number}
  * @constant
  */
-export const R11_SNORM_EAC_Format = 37489; // 0x9271
+export const R11_SIGNED_EAC_Format = 37489; // 0x9271
 
 /**
  * EAC RG11 UNORM format.
@@ -929,7 +929,7 @@ export const R11_SNORM_EAC_Format = 37489; // 0x9271
  * @type {number}
  * @constant
  */
-export const RG11_UNORM_EAC_Format = 37490; // 0x9272
+export const RG11_EAC_Format = 37490; // 0x9272
 
 /**
  * EAC RG11 SNORM format.
@@ -937,7 +937,7 @@ export const RG11_UNORM_EAC_Format = 37490; // 0x9272
  * @type {number}
  * @constant
  */
-export const RG11_SNORM_EAC_Format = 37491; // 0x9273
+export const RG11_SIGNED_EAC_Format = 37491; // 0x9273
 
 /**
  * ASTC RGBA 4x4 format.
diff --git a/src/extras/TextureUtils.js b/src/extras/TextureUtils.js
index 460621b40dec53..88d424b8ce07b4 100644
--- a/src/extras/TextureUtils.js
+++ b/src/extras/TextureUtils.js
@@ -1,4 +1,4 @@
-import { AlphaFormat, RedFormat, RedIntegerFormat, RGFormat, RGIntegerFormat, RGBFormat, RGBAFormat, RGBAIntegerFormat, RGB_S3TC_DXT1_Format, RGBA_S3TC_DXT1_Format, RGBA_S3TC_DXT3_Format, RGBA_S3TC_DXT5_Format, RGB_PVRTC_2BPPV1_Format, RGBA_PVRTC_2BPPV1_Format, RGB_PVRTC_4BPPV1_Format, RGBA_PVRTC_4BPPV1_Format, RGB_ETC1_Format, RGB_ETC2_Format, RGBA_ETC2_EAC_Format, R11_UNORM_EAC_Format, R11_SNORM_EAC_Format, RG11_UNORM_EAC_Format, RG11_SNORM_EAC_Format, RGBA_ASTC_4x4_Format, RGBA_ASTC_5x4_Format, RGBA_ASTC_5x5_Format, RGBA_ASTC_6x5_Format, RGBA_ASTC_6x6_Format, RGBA_ASTC_8x5_Format, RGBA_ASTC_8x6_Format, RGBA_ASTC_8x8_Format, RGBA_ASTC_10x5_Format, RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_10x10_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, RGBA_BPTC_Format, RGB_BPTC_SIGNED_Format, RGB_BPTC_UNSIGNED_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format, UnsignedByteType, ByteType, UnsignedShortType, ShortType, HalfFloatType, UnsignedShort4444Type, UnsignedShort5551Type, UnsignedIntType, IntType, FloatType, UnsignedInt5999Type, UnsignedInt101111Type } from '../constants.js';
+import { AlphaFormat, RedFormat, RedIntegerFormat, RGFormat, RGIntegerFormat, RGBFormat, RGBAFormat, RGBAIntegerFormat, RGB_S3TC_DXT1_Format, RGBA_S3TC_DXT1_Format, RGBA_S3TC_DXT3_Format, RGBA_S3TC_DXT5_Format, RGB_PVRTC_2BPPV1_Format, RGBA_PVRTC_2BPPV1_Format, RGB_PVRTC_4BPPV1_Format, RGBA_PVRTC_4BPPV1_Format, RGB_ETC1_Format, RGB_ETC2_Format, RGBA_ETC2_EAC_Format, R11_EAC_Format, R11_SIGNED_EAC_Format, RG11_EAC_Format, RG11_SIGNED_EAC_Format, RGBA_ASTC_4x4_Format, RGBA_ASTC_5x4_Format, RGBA_ASTC_5x5_Format, RGBA_ASTC_6x5_Format, RGBA_ASTC_6x6_Format, RGBA_ASTC_8x5_Format, RGBA_ASTC_8x6_Format, RGBA_ASTC_8x8_Format, RGBA_ASTC_10x5_Format, RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_10x10_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, RGBA_BPTC_Format, RGB_BPTC_SIGNED_Format, RGB_BPTC_UNSIGNED_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format, UnsignedByteType, ByteType, UnsignedShortType, ShortType, HalfFloatType, UnsignedShort4444Type, UnsignedShort5551Type, UnsignedIntType, IntType, FloatType, UnsignedInt5999Type, UnsignedInt101111Type } from '../constants.js';
 
 /**
  * Scales the texture as large as possible within its surface without cropping
@@ -140,12 +140,12 @@ function getByteLength( width, height, format, type ) {
 		// https://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_etc/
 		case RGB_ETC1_Format:
 		case RGB_ETC2_Format:
-		case R11_UNORM_EAC_Format:
-		case R11_SNORM_EAC_Format:
+		case R11_EAC_Format:
+		case R11_SIGNED_EAC_Format:
 			return Math.floor( ( width + 3 ) / 4 ) * Math.floor( ( height + 3 ) / 4 ) * 8;
 		case RGBA_ETC2_EAC_Format:
-		case RG11_UNORM_EAC_Format:
-		case RG11_SNORM_EAC_Format:
+		case RG11_EAC_Format:
+		case RG11_SIGNED_EAC_Format:
 			return Math.floor( ( width + 3 ) / 4 ) * Math.floor( ( height + 3 ) / 4 ) * 16;
 
 		// https://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_astc/
diff --git a/src/nodes/accessors/MaterialNode.js b/src/nodes/accessors/MaterialNode.js
index 57fa61e9486bce..802dd8b0c148bb 100644
--- a/src/nodes/accessors/MaterialNode.js
+++ b/src/nodes/accessors/MaterialNode.js
@@ -7,7 +7,7 @@ import { uniform } from '../core/UniformNode.js';
 import { normalMap } from '../display/NormalMapNode.js';
 import { bumpMap } from '../display/BumpMapNode.js';
 import { Vector2 } from '../../math/Vector2.js';
-import { RGFormat, RED_GREEN_RGTC2_Format, RG11_UNORM_EAC_Format, NormalRGPacking } from '../../constants.js';
+import { RGFormat, RED_GREEN_RGTC2_Format, RG11_EAC_Format, NormalRGPacking } from '../../constants.js';
 
 
 const _propertyCache = new Map();
@@ -237,7 +237,7 @@ class MaterialNode extends Node {
 				node = normalMap( this.getTexture( 'normal' ), this.getCache( 'normalScale', 'vec2' ) );
 				node.normalMapType = material.normalMapType;
 
-				if ( material.normalMap.format == RGFormat || material.normalMap.format == RED_GREEN_RGTC2_Format || material.normalMap.format == RG11_UNORM_EAC_Format ) {
+				if ( material.normalMap.format == RGFormat || material.normalMap.format == RED_GREEN_RGTC2_Format || material.normalMap.format == RG11_EAC_Format ) {
 
 					node.unpackNormalMode = NormalRGPacking;
 
diff --git a/src/renderers/webgpu/utils/WebGPUTextureUtils.js b/src/renderers/webgpu/utils/WebGPUTextureUtils.js
index b2995c418cd321..d320c72a2e5957 100644
--- a/src/renderers/webgpu/utils/WebGPUTextureUtils.js
+++ b/src/renderers/webgpu/utils/WebGPUTextureUtils.js
@@ -15,7 +15,7 @@ import {
 	RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_10x10_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, UnsignedIntType, UnsignedShortType, UnsignedInt248Type, UnsignedInt5999Type,
 	NeverCompare, AlwaysCompare, LessCompare, LessEqualCompare, EqualCompare, GreaterEqualCompare, GreaterCompare, NotEqualCompare, IntType, RedIntegerFormat, RGIntegerFormat, RGBAIntegerFormat,
 	UnsignedInt101111Type, RGBA_BPTC_Format, RGB_ETC1_Format, RGB_S3TC_DXT1_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format,
-	R11_UNORM_EAC_Format, R11_SNORM_EAC_Format, RG11_UNORM_EAC_Format, RG11_SNORM_EAC_Format,
+	R11_EAC_Format, R11_SIGNED_EAC_Format, RG11_EAC_Format, RG11_SIGNED_EAC_Format,
 } from '../../../constants.js';
 import { CubeTexture } from '../../../textures/CubeTexture.js';
 import { Texture } from '../../../textures/Texture.js';
@@ -1240,19 +1240,19 @@ export function getFormat( texture, device = null ) {
 				formatGPU = ( transfer === SRGBTransfer ) ? GPUTextureFormat.ETC2RGBA8UnormSRGB : GPUTextureFormat.ETC2RGBA8Unorm;
 				break;
 
-			case R11_UNORM_EAC_Format:
+			case R11_EAC_Format:
 				formatGPU = GPUTextureFormat.EACR11Unorm;
 				break;
 
-			case R11_SNORM_EAC_Format:
+			case R11_SIGNED_EAC_Format:
 				formatGPU = GPUTextureFormat.EACR11Snorm;
 				break;
 
-			case RG11_UNORM_EAC_Format:
+			case RG11_EAC_Format:
 				formatGPU = GPUTextureFormat.EACRG11Unorm;
 				break;
 
-			case RG11_SNORM_EAC_Format:
+			case RG11_SIGNED_EAC_Format:
 				formatGPU = GPUTextureFormat.EACRG11Snorm;
 				break;
 

From 369cf9a6a0539bd6f1a07b33b704d37a990a8ced Mon Sep 17 00:00:00 2001
From: Ignacio Castano <castano@ludicon.com>
Date: Wed, 19 Nov 2025 21:19:41 -0800
Subject: [PATCH 09/11] Match WebGL naming convention exactly.

---
 examples/jsm/loaders/KTX2Loader.js               | 8 ++++----
 src/constants.js                                 | 4 ++--
 src/extras/TextureUtils.js                       | 6 +++---
 src/renderers/webgpu/utils/WebGPUTextureUtils.js | 6 +++---
 4 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/examples/jsm/loaders/KTX2Loader.js b/examples/jsm/loaders/KTX2Loader.js
index 39c8f87bd21a6d..9ffc1c6336269d 100644
--- a/examples/jsm/loaders/KTX2Loader.js
+++ b/examples/jsm/loaders/KTX2Loader.js
@@ -21,9 +21,9 @@ import {
 	RGBA_S3TC_DXT3_Format,
 	RGBA_ETC2_EAC_Format,
 	R11_EAC_Format,
-	R11_SIGNED_EAC_Format,
+	SIGNED_R11_EAC_Format,
 	RG11_EAC_Format,
-	RG11_SIGNED_EAC_Format,
+	SIGNED_RG11_EAC_Format,
 	RGBA_PVRTC_4BPPV1_Format,
 	RGBA_PVRTC_2BPPV1_Format,
 	RGBA_S3TC_DXT1_Format,
@@ -977,9 +977,9 @@ const FORMAT_MAP = {
 	[ VK_FORMAT_ETC2_R8G8B8A8_SRGB_BLOCK ]: RGBA_ETC2_EAC_Format,
 	[ VK_FORMAT_ETC2_R8G8B8_SRGB_BLOCK ]: RGB_ETC2_Format,
 	[ VK_FORMAT_EAC_R11_UNORM_BLOCK ]: R11_EAC_Format,
-	[ VK_FORMAT_EAC_R11_SNORM_BLOCK ]: R11_SIGNED_EAC_Format,
+	[ VK_FORMAT_EAC_R11_SNORM_BLOCK ]: SIGNED_R11_EAC_Format,
 	[ VK_FORMAT_EAC_R11G11_UNORM_BLOCK ]: RG11_EAC_Format,
-	[ VK_FORMAT_EAC_R11G11_SNORM_BLOCK ]: RG11_SIGNED_EAC_Format,
+	[ VK_FORMAT_EAC_R11G11_SNORM_BLOCK ]: SIGNED_RG11_EAC_Format,
 
 	[ VK_FORMAT_ASTC_4x4_SFLOAT_BLOCK_EXT ]: RGBA_ASTC_4x4_Format,
 	[ VK_FORMAT_ASTC_4x4_SRGB_BLOCK ]: RGBA_ASTC_4x4_Format,
diff --git a/src/constants.js b/src/constants.js
index dd132a8e3a1266..39de2a5799219c 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -921,7 +921,7 @@ export const R11_EAC_Format = 37488; // 0x9270
  * @type {number}
  * @constant
  */
-export const R11_SIGNED_EAC_Format = 37489; // 0x9271
+export const SIGNED_R11_EAC_Format = 37489; // 0x9271
 
 /**
  * EAC RG11 UNORM format.
@@ -937,7 +937,7 @@ export const RG11_EAC_Format = 37490; // 0x9272
  * @type {number}
  * @constant
  */
-export const RG11_SIGNED_EAC_Format = 37491; // 0x9273
+export const SIGNED_RG11_EAC_Format = 37491; // 0x9273
 
 /**
  * ASTC RGBA 4x4 format.
diff --git a/src/extras/TextureUtils.js b/src/extras/TextureUtils.js
index 88d424b8ce07b4..d3b7b4b4fb420e 100644
--- a/src/extras/TextureUtils.js
+++ b/src/extras/TextureUtils.js
@@ -1,4 +1,4 @@
-import { AlphaFormat, RedFormat, RedIntegerFormat, RGFormat, RGIntegerFormat, RGBFormat, RGBAFormat, RGBAIntegerFormat, RGB_S3TC_DXT1_Format, RGBA_S3TC_DXT1_Format, RGBA_S3TC_DXT3_Format, RGBA_S3TC_DXT5_Format, RGB_PVRTC_2BPPV1_Format, RGBA_PVRTC_2BPPV1_Format, RGB_PVRTC_4BPPV1_Format, RGBA_PVRTC_4BPPV1_Format, RGB_ETC1_Format, RGB_ETC2_Format, RGBA_ETC2_EAC_Format, R11_EAC_Format, R11_SIGNED_EAC_Format, RG11_EAC_Format, RG11_SIGNED_EAC_Format, RGBA_ASTC_4x4_Format, RGBA_ASTC_5x4_Format, RGBA_ASTC_5x5_Format, RGBA_ASTC_6x5_Format, RGBA_ASTC_6x6_Format, RGBA_ASTC_8x5_Format, RGBA_ASTC_8x6_Format, RGBA_ASTC_8x8_Format, RGBA_ASTC_10x5_Format, RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_10x10_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, RGBA_BPTC_Format, RGB_BPTC_SIGNED_Format, RGB_BPTC_UNSIGNED_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format, UnsignedByteType, ByteType, UnsignedShortType, ShortType, HalfFloatType, UnsignedShort4444Type, UnsignedShort5551Type, UnsignedIntType, IntType, FloatType, UnsignedInt5999Type, UnsignedInt101111Type } from '../constants.js';
+import { AlphaFormat, RedFormat, RedIntegerFormat, RGFormat, RGIntegerFormat, RGBFormat, RGBAFormat, RGBAIntegerFormat, RGB_S3TC_DXT1_Format, RGBA_S3TC_DXT1_Format, RGBA_S3TC_DXT3_Format, RGBA_S3TC_DXT5_Format, RGB_PVRTC_2BPPV1_Format, RGBA_PVRTC_2BPPV1_Format, RGB_PVRTC_4BPPV1_Format, RGBA_PVRTC_4BPPV1_Format, RGB_ETC1_Format, RGB_ETC2_Format, RGBA_ETC2_EAC_Format, R11_EAC_Format, SIGNED_R11_EAC_Format, RG11_EAC_Format, SIGNED_RG11_EAC_Format, RGBA_ASTC_4x4_Format, RGBA_ASTC_5x4_Format, RGBA_ASTC_5x5_Format, RGBA_ASTC_6x5_Format, RGBA_ASTC_6x6_Format, RGBA_ASTC_8x5_Format, RGBA_ASTC_8x6_Format, RGBA_ASTC_8x8_Format, RGBA_ASTC_10x5_Format, RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_10x10_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, RGBA_BPTC_Format, RGB_BPTC_SIGNED_Format, RGB_BPTC_UNSIGNED_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format, UnsignedByteType, ByteType, UnsignedShortType, ShortType, HalfFloatType, UnsignedShort4444Type, UnsignedShort5551Type, UnsignedIntType, IntType, FloatType, UnsignedInt5999Type, UnsignedInt101111Type } from '../constants.js';
 
 /**
  * Scales the texture as large as possible within its surface without cropping
@@ -141,11 +141,11 @@ function getByteLength( width, height, format, type ) {
 		case RGB_ETC1_Format:
 		case RGB_ETC2_Format:
 		case R11_EAC_Format:
-		case R11_SIGNED_EAC_Format:
+		case SIGNED_R11_EAC_Format:
 			return Math.floor( ( width + 3 ) / 4 ) * Math.floor( ( height + 3 ) / 4 ) * 8;
 		case RGBA_ETC2_EAC_Format:
 		case RG11_EAC_Format:
-		case RG11_SIGNED_EAC_Format:
+		case SIGNED_RG11_EAC_Format:
 			return Math.floor( ( width + 3 ) / 4 ) * Math.floor( ( height + 3 ) / 4 ) * 16;
 
 		// https://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_astc/
diff --git a/src/renderers/webgpu/utils/WebGPUTextureUtils.js b/src/renderers/webgpu/utils/WebGPUTextureUtils.js
index d320c72a2e5957..cde2d7a7eabbfd 100644
--- a/src/renderers/webgpu/utils/WebGPUTextureUtils.js
+++ b/src/renderers/webgpu/utils/WebGPUTextureUtils.js
@@ -15,7 +15,7 @@ import {
 	RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_10x10_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, UnsignedIntType, UnsignedShortType, UnsignedInt248Type, UnsignedInt5999Type,
 	NeverCompare, AlwaysCompare, LessCompare, LessEqualCompare, EqualCompare, GreaterEqualCompare, GreaterCompare, NotEqualCompare, IntType, RedIntegerFormat, RGIntegerFormat, RGBAIntegerFormat,
 	UnsignedInt101111Type, RGBA_BPTC_Format, RGB_ETC1_Format, RGB_S3TC_DXT1_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format,
-	R11_EAC_Format, R11_SIGNED_EAC_Format, RG11_EAC_Format, RG11_SIGNED_EAC_Format,
+	R11_EAC_Format, SIGNED_R11_EAC_Format, RG11_EAC_Format, SIGNED_RG11_EAC_Format,
 } from '../../../constants.js';
 import { CubeTexture } from '../../../textures/CubeTexture.js';
 import { Texture } from '../../../textures/Texture.js';
@@ -1244,7 +1244,7 @@ export function getFormat( texture, device = null ) {
 				formatGPU = GPUTextureFormat.EACR11Unorm;
 				break;
 
-			case R11_SIGNED_EAC_Format:
+			case SIGNED_R11_EAC_Format:
 				formatGPU = GPUTextureFormat.EACR11Snorm;
 				break;
 
@@ -1252,7 +1252,7 @@ export function getFormat( texture, device = null ) {
 				formatGPU = GPUTextureFormat.EACRG11Unorm;
 				break;
 
-			case RG11_SIGNED_EAC_Format:
+			case SIGNED_RG11_EAC_Format:
 				formatGPU = GPUTextureFormat.EACRG11Snorm;
 				break;
 

From caf76c7d666bfe8caed0adef7655636bf9401987 Mon Sep 17 00:00:00 2001
From: Ignacio Castano <castano@ludicon.com>
Date: Wed, 19 Nov 2025 21:20:35 -0800
Subject: [PATCH 10/11] Check for the presence of the ETC WebGL extension to
 use the EAC formats.

---
 src/renderers/webgl/WebGLUtils.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/renderers/webgl/WebGLUtils.js b/src/renderers/webgl/WebGLUtils.js
index d0ae49507e2901..7dc4d9dafad789 100644
--- a/src/renderers/webgl/WebGLUtils.js
+++ b/src/renderers/webgl/WebGLUtils.js
@@ -1,4 +1,4 @@
-import { RGBA_ASTC_4x4_Format, RGBA_ASTC_5x4_Format, RGBA_ASTC_5x5_Format, RGBA_ASTC_6x5_Format, RGBA_ASTC_6x6_Format, RGBA_ASTC_8x5_Format, RGBA_ASTC_8x6_Format, RGBA_ASTC_8x8_Format, RGBA_ASTC_10x5_Format, RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_10x10_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, RGB_ETC1_Format, RGB_ETC2_Format, RGBA_ETC2_EAC_Format, RGBA_PVRTC_2BPPV1_Format, RGBA_PVRTC_4BPPV1_Format, RGB_PVRTC_2BPPV1_Format, RGB_PVRTC_4BPPV1_Format, RGBA_S3TC_DXT5_Format, RGBA_S3TC_DXT3_Format, RGBA_S3TC_DXT1_Format, RGB_S3TC_DXT1_Format, DepthFormat, DepthStencilFormat, RedFormat, RGBAFormat, AlphaFormat, RedIntegerFormat, RGFormat, RGIntegerFormat, RGBAIntegerFormat, HalfFloatType, FloatType, UnsignedIntType, IntType, UnsignedShortType, ShortType, ByteType, UnsignedInt248Type, UnsignedShort5551Type, UnsignedShort4444Type, UnsignedByteType, RGBA_BPTC_Format, RGB_BPTC_SIGNED_Format, RGB_BPTC_UNSIGNED_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format, NoColorSpace, SRGBTransfer, UnsignedInt5999Type, RGBFormat, UnsignedInt101111Type } from '../../constants.js';
+import { RGBA_ASTC_4x4_Format, RGBA_ASTC_5x4_Format, RGBA_ASTC_5x5_Format, RGBA_ASTC_6x5_Format, RGBA_ASTC_6x6_Format, RGBA_ASTC_8x5_Format, RGBA_ASTC_8x6_Format, RGBA_ASTC_8x8_Format, RGBA_ASTC_10x5_Format, RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_10x10_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, RGB_ETC1_Format, RGB_ETC2_Format, RGBA_ETC2_EAC_Format, R11_EAC_Format, SIGNED_R11_EAC_Format, RG11_EAC_Format, SIGNED_RG11_EAC_Format, RGBA_PVRTC_2BPPV1_Format, RGBA_PVRTC_4BPPV1_Format, RGB_PVRTC_2BPPV1_Format, RGB_PVRTC_4BPPV1_Format, RGBA_S3TC_DXT5_Format, RGBA_S3TC_DXT3_Format, RGBA_S3TC_DXT1_Format, RGB_S3TC_DXT1_Format, DepthFormat, DepthStencilFormat, RedFormat, RGBAFormat, AlphaFormat, RedIntegerFormat, RGFormat, RGIntegerFormat, RGBAIntegerFormat, HalfFloatType, FloatType, UnsignedIntType, IntType, UnsignedShortType, ShortType, ByteType, UnsignedInt248Type, UnsignedShort5551Type, UnsignedShort4444Type, UnsignedByteType, RGBA_BPTC_Format, RGB_BPTC_SIGNED_Format, RGB_BPTC_UNSIGNED_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format, NoColorSpace, SRGBTransfer, UnsignedInt5999Type, RGBFormat, UnsignedInt101111Type } from '../../constants.js';
 import { ColorManagement } from '../../math/ColorManagement.js';
 
 function WebGLUtils( gl, extensions ) {
@@ -102,7 +102,7 @@ function WebGLUtils( gl, extensions ) {
 
 		// ETC
 
-		if ( p === RGB_ETC1_Format || p === RGB_ETC2_Format || p === RGBA_ETC2_EAC_Format ) {
+		if ( p === RGB_ETC1_Format || p === RGB_ETC2_Format || p === RGBA_ETC2_EAC_Format || p === R11_EAC_Format || p === SIGNED_R11_EAC_Format || p === RG11_EAC_Format || p === SIGNED_RG11_EAC_Format ) {
 
 			extension = extensions.get( 'WEBGL_compressed_texture_etc' );
 
@@ -110,6 +110,10 @@ function WebGLUtils( gl, extensions ) {
 
 				if ( p === RGB_ETC1_Format || p === RGB_ETC2_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ETC2 : extension.COMPRESSED_RGB8_ETC2;
 				if ( p === RGBA_ETC2_EAC_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ETC2_EAC : extension.COMPRESSED_RGBA8_ETC2_EAC;
+				if ( p === R11_EAC_Format ) return extension.COMPRESSED_R11_EAC;
+				if ( p === SIGNED_R11_EAC_Format ) return extension.COMPRESSED_SIGNED_R11_EAC;
+				if ( p === RG11_EAC_Format ) return extension.COMPRESSED_RG11_EAC;
+				if ( p === SIGNED_RG11_EAC_Format ) return extension.COMPRESSED_SIGNED_RG11_EAC;
 
 			} else {
 

From ebb0d4ddffefd748b09ac0e1f66b92bc5eac49ec Mon Sep 17 00:00:00 2001
From: Ignacio Castano <castano@ludicon.com>
Date: Thu, 20 Nov 2025 10:03:34 -0800
Subject: [PATCH 11/11] Update WebGLUtils.convert in webgl-fallback.

---
 src/renderers/webgl-fallback/utils/WebGLUtils.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/renderers/webgl-fallback/utils/WebGLUtils.js b/src/renderers/webgl-fallback/utils/WebGLUtils.js
index b3c06225c309c4..1cf05bc93de85e 100644
--- a/src/renderers/webgl-fallback/utils/WebGLUtils.js
+++ b/src/renderers/webgl-fallback/utils/WebGLUtils.js
@@ -1,4 +1,4 @@
-import { RGBA_ASTC_4x4_Format, RGBA_ASTC_5x4_Format, RGBA_ASTC_5x5_Format, RGBA_ASTC_6x5_Format, RGBA_ASTC_6x6_Format, RGBA_ASTC_8x5_Format, RGBA_ASTC_8x6_Format, RGBA_ASTC_8x8_Format, RGBA_ASTC_10x5_Format, RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_10x10_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, RGB_ETC1_Format, RGB_ETC2_Format, RGBA_ETC2_EAC_Format, RGBA_PVRTC_2BPPV1_Format, RGBA_PVRTC_4BPPV1_Format, RGB_PVRTC_2BPPV1_Format, RGB_PVRTC_4BPPV1_Format, RGBA_S3TC_DXT5_Format, RGBA_S3TC_DXT3_Format, RGBA_S3TC_DXT1_Format, RGB_S3TC_DXT1_Format, DepthFormat, DepthStencilFormat, RedFormat, RGBFormat, RGBAFormat, AlphaFormat, RedIntegerFormat, RGFormat, RGIntegerFormat, RGBAIntegerFormat, HalfFloatType, FloatType, UnsignedIntType, IntType, UnsignedShortType, ShortType, ByteType, UnsignedInt248Type, UnsignedInt5999Type, UnsignedShort5551Type, UnsignedShort4444Type, UnsignedByteType, RGBA_BPTC_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format, SRGBTransfer, NoColorSpace, UnsignedInt101111Type } from '../../../constants.js';
+import { RGBA_ASTC_4x4_Format, RGBA_ASTC_5x4_Format, RGBA_ASTC_5x5_Format, RGBA_ASTC_6x5_Format, RGBA_ASTC_6x6_Format, RGBA_ASTC_8x5_Format, RGBA_ASTC_8x6_Format, RGBA_ASTC_8x8_Format, RGBA_ASTC_10x5_Format, RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_10x10_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, RGB_ETC1_Format, RGB_ETC2_Format, RGBA_ETC2_EAC_Format, R11_EAC_Format, SIGNED_R11_EAC_Format, RG11_EAC_Format, SIGNED_RG11_EAC_Format, RGBA_PVRTC_2BPPV1_Format, RGBA_PVRTC_4BPPV1_Format, RGB_PVRTC_2BPPV1_Format, RGB_PVRTC_4BPPV1_Format, RGBA_S3TC_DXT5_Format, RGBA_S3TC_DXT3_Format, RGBA_S3TC_DXT1_Format, RGB_S3TC_DXT1_Format, DepthFormat, DepthStencilFormat, RedFormat, RGBFormat, RGBAFormat, AlphaFormat, RedIntegerFormat, RGFormat, RGIntegerFormat, RGBAIntegerFormat, HalfFloatType, FloatType, UnsignedIntType, IntType, UnsignedShortType, ShortType, ByteType, UnsignedInt248Type, UnsignedInt5999Type, UnsignedShort5551Type, UnsignedShort4444Type, UnsignedByteType, RGBA_BPTC_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format, SRGBTransfer, NoColorSpace, UnsignedInt101111Type } from '../../../constants.js';
 import { ColorManagement } from '../../../math/ColorManagement.js';
 
 /**
@@ -154,7 +154,7 @@ class WebGLUtils {
 
 		// ETC
 
-		if ( p === RGB_ETC1_Format || p === RGB_ETC2_Format || p === RGBA_ETC2_EAC_Format ) {
+		if ( p === RGB_ETC1_Format || p === RGB_ETC2_Format || p === RGBA_ETC2_EAC_Format || p === R11_EAC_Format || p === SIGNED_R11_EAC_Format || p === RG11_EAC_Format || p === SIGNED_RG11_EAC_Format ) {
 
 			extension = extensions.get( 'WEBGL_compressed_texture_etc' );
 
@@ -162,6 +162,10 @@ class WebGLUtils {
 
 				if ( p === RGB_ETC1_Format || p === RGB_ETC2_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ETC2 : extension.COMPRESSED_RGB8_ETC2;
 				if ( p === RGBA_ETC2_EAC_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ETC2_EAC : extension.COMPRESSED_RGBA8_ETC2_EAC;
+				if ( p === R11_EAC_Format ) return extension.COMPRESSED_R11_EAC;
+				if ( p === SIGNED_R11_EAC_Format ) return extension.COMPRESSED_SIGNED_R11_EAC;
+				if ( p === RG11_EAC_Format ) return extension.COMPRESSED_RG11_EAC;
+				if ( p === SIGNED_RG11_EAC_Format ) return extension.COMPRESSED_SIGNED_RG11_EAC;
 
 			} else {