WEBGL_compressed_texture_etc1 extension

The WEBGL_compressed_texture_etc1 extension is part of the WebGL API and exposes the ETC1 compressed texture format.

Compressed textures reduce the amount of memory needed to store a texture on the GPU, allowing for higher resolution textures or more of the same resolution textures.

WebGL extensions are available using the WebGLRenderingContext.getExtension() method. For more information, see also Using Extensions in the WebGL tutorial.

Constants

The compressed texture format is exposed by a constant and can be used with the compressedTexImage2D() method (note that ETC1 is not supported with the compressedTexSubImage2D() method).

ext.COMPRESSED_RGB_ETC1_WEBGL

Compresses 24-bit RGB data with no alpha channel.

Examples

const ext = gl.getExtension("WEBGL_compressed_texture_etc1");

const texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);

gl.compressedTexImage2D(
  gl.TEXTURE_2D,
  0,
  ext.COMPRESSED_RGB_ETC1_WEBGL,
  512,
  512,
  0,
  textureData,
);

Specifications

Browser compatibility

See also

• Ericsson Texture Compression – Wikipedia
• WEBGL_compressed_texture_etc (ETC2 and EAC)
• WebGLRenderingContext.getExtension()
• WebGLRenderingContext.compressedTexImage2D()
• WebGLRenderingContext.getParameter()