The window whose callback to set.
The new scroll callback, or null to remove the currently set callback.
The previously set callback, or null if no callback was set or the library had not been initialized.
@callback_signature
void function_name(GLFWwindow* window, double xoffset, double yoffset)
For more information about the callback parameters, see the function pointer type.
Errors: Possible errors include @ref GLFW_NOT_INITIALIZED.
This function must only be called from the main thread.
@sa @ref scrolling
Added in version 3.0. Replaces glfwSetMouseWheelCallback.
Ingroup: input
Sets the scroll callback.
This function sets the scroll callback of the specified window, which is called when a scrolling device is used, such as a mouse wheel or scrolling area of a touchpad.
The scroll callback receives all scrolling input, like that from a mouse wheel or a touchpad scrolling area.