Renderers: Add support for EAC texture formats. (#1906)

Author: Methuselah96

types/three/src/constants.d.ts

@@ -508,6 +508,11 @@ export const RGB_ETC2_Format: 37492;
  */
 export const RGBA_ETC2_EAC_Format: 37496;
 
+export const R11_EAC_Format: 37488;
+export const SIGNED_R11_EAC_Format: 37489;
+export const RG11_EAC_Format: 37490;
+export const SIGNED_RG11_EAC_Format: 37491;
+
 // ASTC compressed texture formats
 
 /**
@@ -598,6 +603,10 @@ export type CompressedPixelFormat =
     | typeof RGB_ETC1_Format
     | typeof RGB_ETC2_Format
     | typeof RGBA_ETC2_EAC_Format
+    | typeof R11_EAC_Format
+    | typeof SIGNED_R11_EAC_Format
+    | typeof RG11_EAC_Format
+    | typeof SIGNED_RG11_EAC_Format
     | typeof RGBA_ASTC_4x4_Format
     | typeof RGBA_ASTC_5x4_Format
     | typeof RGBA_ASTC_5x5_Format