compressedTexSubImage2D method
      
void
compressedTexSubImage2D(])
      
     
    
    
Implementation
external void compressedTexSubImage2D(
  GLenum target,
  GLint level,
  GLint xoffset,
  GLint yoffset,
  GLsizei width,
  GLsizei height,
  GLenum format,
  JSAny imageSizeOrSrcData, [
  JSAny offsetOrSrcOffset,
  GLuint srcLengthOverride,
]);