Function gpujpeg_opengl_init

pub unsafe extern "C" fn gpujpeg_opengl_init(
    ctx: *mut *mut gpujpeg_opengl_context,
) -> c_int

Init OpenGL context

This call is optional - initializes OpenGL context, thus doesn’t need to be called when context already exists. If not called, however, it may be required to run glewInit() from client code prior to running GPUJPEG with GL interoperability.

Returned pointer should be freed with gpujpeg_opengl_destroy() when done.

@param[out] ctx pointer to OpenGL context data (to be passed to gpujpeg_opengl_destroy())

return

 0  if succeeds, otherwise nonzero

return

-1  if initialization fails

return

-2  if OpenGL support was not compiled in