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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/WebGL2RenderingContext/compressedTexSubImage3D below:

WebGL2RenderingContext: compressedTexSubImage3D() method - Web APIs

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The WebGL2RenderingContext.compressedTexSubImage3D() method of the WebGL API specifies a three-dimensional sub-rectangle for a texture image in a compressed format.

compressedTexSubImage3D(target, level, xoffset, yoffset, zoffset, width, height, depth, format, imageSize, offset)

compressedTexSubImage3D(target, level, xoffset, yoffset, zoffset, width, height, depth, format, srcData)
compressedTexSubImage3D(target, level, xoffset, yoffset, zoffset, width, height, depth, format, srcData, srcOffset)
compressedTexSubImage3D(target, level, xoffset, yoffset, zoffset, width, height, depth, format, srcData, srcOffset, srcLengthOverride)

target

A GLenum specifying the binding point (target) of the active texture. Possible values:

• gl.TEXTURE_3D: A three-dimensional texture.
• gl.TEXTURE_2D_ARRAY: A two-dimensional array texture.

level

A GLint specifying the level of detail. Level 0 is the base image level and level n is the n-th mipmap reduction level.

xoffset

A GLint specifying the x offset within the compressed texture image.

yoffset

A GLint specifying the y offset within the compressed texture image.

zoffset

A GLint specifying the z offset within the compressed texture image.

width

A GLsizei specifying the width of the texture.

height

A GLsizei specifying the height of the texture.

depth

A GLsizei specifying the depth of the texture.

format

A GLenum specifying the compressed image format. Possible values:

• gl.COMPRESSED_R11_EAC
• gl.COMPRESSED_SIGNED_R11_EAC
• gl.COMPRESSED_RG11_EAC
• gl.COMPRESSED_SIGNED_RG11_EAC
• gl.COMPRESSED_RGB8_ETC2
• gl.COMPRESSED_RGBA8_ETC2_EAC
• gl.COMPRESSED_SRGB8_ETC2
• gl.COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
• gl.COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
• gl.COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2

imageSize

A GLint specifying the number of bytes to read from the buffer bound to gl.PIXEL_UNPACK_BUFFER.

offset

A GLint specifying the offset in bytes from which to read from the buffer bound to gl.PIXEL_UNPACK_BUFFER.

srcData

A TypedArray or a DataView object that will be used as a data store for the compressed image data in memory.

None (undefined).

gl.compressedTexSubImage3D(
  gl.TEXTURE_3D,
  0,
  0,
  0,
  512,
  512,
  512,
  gl.COMPRESSED_R11_EAC,
  textureData,
);

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