---
title: "EXT_texture_compression_rgtc | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Interface EXT\_texture\_compression\_rgtc

The **`EXT_texture_compression_rgtc`** extension is part of the WebGL API and exposes 4 RGTC compressed texture formats. RGTC is a block-based texture compression format suited for unsigned and signed red and red-green textures (Red-Green Texture Compression).

[MDN Reference](https://developer.mozilla.org/docs/Web/API/EXT_texture_compression_rgtc)

interface EXT\_texture\_compression\_rgtc {  
    [COMPRESSED\_RED\_GREEN\_RGTC2\_EXT](#compressed_red_green_rgtc2_ext): 36285;  
    [COMPRESSED\_RED\_RGTC1\_EXT](#compressed_red_rgtc1_ext): 36283;  
    [COMPRESSED\_SIGNED\_RED\_GREEN\_RGTC2\_EXT](#compressed_signed_red_green_rgtc2_ext): 36286;  
    [COMPRESSED\_SIGNED\_RED\_RGTC1\_EXT](#compressed_signed_red_rgtc1_ext): 36284;  
}

##### Index

### Properties[](#properties)

[COMPRESSED\_RED\_GREEN\_RGTC2\_EXT](#compressed_red_green_rgtc2_ext) [COMPRESSED\_RED\_RGTC1\_EXT](#compressed_red_rgtc1_ext) [COMPRESSED\_SIGNED\_RED\_GREEN\_RGTC2\_EXT](#compressed_signed_red_green_rgtc2_ext) [COMPRESSED\_SIGNED\_RED\_RGTC1\_EXT](#compressed_signed_red_rgtc1_ext)

## Properties[](#properties-1)

### `Readonly`COMPRESSED\_RED\_GREEN\_RGTC2\_EXT[](#compressed_red_green_rgtc2_ext)

COMPRESSED\_RED\_GREEN\_RGTC2\_EXT: 36285

### `Readonly`COMPRESSED\_RED\_RGTC1\_EXT[](#compressed_red_rgtc1_ext)

COMPRESSED\_RED\_RGTC1\_EXT: 36283

### `Readonly`COMPRESSED\_SIGNED\_RED\_GREEN\_RGTC2\_EXT[](#compressed_signed_red_green_rgtc2_ext)

COMPRESSED\_SIGNED\_RED\_GREEN\_RGTC2\_EXT: 36286

### `Readonly`COMPRESSED\_SIGNED\_RED\_RGTC1\_EXT[](#compressed_signed_red_rgtc1_ext)

COMPRESSED\_SIGNED\_RED\_RGTC1\_EXT: 36284