Support ETC2/EAC.

docs/api/en/constants/Textures.html

@@ -262,11 +262,14 @@
 		<h2>ETC Compressed Texture Format</h2>
 		<code>
 		THREE.RGB_ETC1_Format
+		THREE.RGB_ETC2_Format
+		THREE.RGBA_ETC2_EAC_Format
 		</code>
 		<p>
 		For use with a [page:CompressedTexture CompressedTexture]'s [page:Texture.format format]	property,
 		these require support for the [link:https://www.khronos.org/registry/webgl/extensions/WEBGL_compressed_texture_etc1/ WEBGL_compressed_texture_etc1]
-		extension. <br /><br />
+		(ETC1) or [link:https://www.khronos.org/registry/webgl/extensions/WEBGL_compressed_texture_etc/ WEBGL_compressed_texture_etc]
+		(ETC2) extensions. <br /><br />
 		</p>
 
 		<h2>Internal Formats</h2>

src/constants.d.ts

@@ -258,6 +258,8 @@ export const RGBA_PVRTC_2BPPV1_Format: CompressedPixelFormat;
 
 // ETC compressed texture formats
 export const RGB_ETC1_Format: CompressedPixelFormat;
+export const RGB_ETC2_Format: CompressedPixelFormat;
+export const RGBA_ETC2_EAC_Format: CompressedPixelFormat;
 
 // ASTC compressed texture formats
 export const RGBA_ASTC_4x4_Format: CompressedPixelFormat;

src/constants.js

@@ -116,6 +116,8 @@ export var RGB_PVRTC_2BPPV1_Format = 35841;
 export var RGBA_PVRTC_4BPPV1_Format = 35842;
 export var RGBA_PVRTC_2BPPV1_Format = 35843;
 export var RGB_ETC1_Format = 36196;
+export var RGB_ETC2_Format = 37492;
+export var RGBA_ETC2_EAC_Format = 37496;
 export var RGBA_ASTC_4x4_Format = 37808;
 export var RGBA_ASTC_5x4_Format = 37809;
 export var RGBA_ASTC_5x5_Format = 37810;

src/renderers/webgl/WebGLUtils.js

@@ -2,7 +2,7 @@
  * @author thespite / http://www.twitter.com/thespite
  */
 
-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, 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, LuminanceAlphaFormat, LuminanceFormat, RedFormat, RGBAFormat, RGBFormat, AlphaFormat, RedIntegerFormat, RGFormat, RGIntegerFormat, RGBIntegerFormat, RGBAIntegerFormat, HalfFloatType, FloatType, UnsignedIntType, IntType, UnsignedShortType, ShortType, ByteType, UnsignedInt248Type, UnsignedShort565Type, UnsignedShort5551Type, UnsignedShort4444Type, UnsignedByteType } 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, 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, LuminanceAlphaFormat, LuminanceFormat, RedFormat, RGBAFormat, RGBFormat, AlphaFormat, RedIntegerFormat, RGFormat, RGIntegerFormat, RGBIntegerFormat, RGBAIntegerFormat, HalfFloatType, FloatType, UnsignedIntType, IntType, UnsignedShortType, ShortType, ByteType, UnsignedInt248Type, UnsignedShort565Type, UnsignedShort5551Type, UnsignedShort4444Type, UnsignedByteType } from '../../constants.js';
 
 function WebGLUtils( gl, extensions, capabilities ) {
 
@@ -115,6 +115,19 @@ function WebGLUtils( gl, extensions, capabilities ) {
 
 		}
 
+		if ( p === RGB_ETC2_Format || p === RGBA_ETC2_EAC_Format ) {
+
+			extension = extensions.get( 'WEBGL_compressed_texture_etc' );
+
+			if ( extension !== null ) {
+
+				if ( p === RGB_ETC2_Format ) return extension.COMPRESSED_RGB8_ETC2;
+				if ( p === RGBA_ETC2_EAC_Format ) return extension.COMPRESSED_RGBA8_ETC2_EAC;
+
+			}
+
+		}
+
 		if ( p === RGBA_ASTC_4x4_Format || p === RGBA_ASTC_5x4_Format || p === RGBA_ASTC_5x5_Format ||
 			p === RGBA_ASTC_6x5_Format || p === RGBA_ASTC_6x6_Format || p === RGBA_ASTC_8x5_Format ||
 			p === RGBA_ASTC_8x6_Format || p === RGBA_ASTC_8x8_Format || p === RGBA_ASTC_10x5_Format ||