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WEBGL_compressed_texture_pvrtc extension - Web APIs | MDN
The compressed texture formats are exposed by four constants and can be used in two functions: compressedTexImage2D()height and width parameters must be powers of 2) and compressedTexSubImage2D()xoffset and yoffset parameters must be 0).
ext.COMPRESSED_RGB_PVRTC_4BPPV1_IMG
RGB compression in 4-bit mode. One block for each 4×4 pixels.
ext.COMPRESSED_RGBA_PVRTC_4BPPV1_IMG
RGBA compression in 4-bit mode. One block for each 4×4 pixels.
ext.COMPRESSED_RGB_PVRTC_2BPPV1_IMG
RGB compression in 2-bit mode. One block for each 8×4 pixels.
ext.COMPRESSED_RGBA_PVRTC_2BPPV1_IMG
RGBA compression in 2-bit mode. One block for each 8×4 pixels.
const ext = gl.getExtension("WEBGL_compressed_texture_pvrtc");
const texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.compressedTexImage2D(
gl.TEXTURE_2D,
0,
ext.COMPRESSED_RGB_PVRTC_4BPPV1_IMG,
512,
512,
0,
textureData,
);
