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//! Low-level bindings to ViewPort API.

use core::ffi::c_void;

use crate::opaque;

use super::canvas::Canvas;

opaque!(ViewPort);
opaque!(InputEvent);

pub type ViewPortDrawCallback = extern fn(*mut Canvas, *mut c_void);
pub type ViewPortInputCallback = extern fn(*mut InputEvent, *mut c_void);

extern "C" {
    #[link_name = "view_port_alloc"]
    pub fn alloc() -> *mut ViewPort;
    #[link_name = "view_port_free"]
    pub fn free(view_port: *mut ViewPort);
    #[link_name = "view_port_enabled_set"]
    pub fn enabled_set(view_port: *mut ViewPort, enabled: bool);
    #[link_name = "view_port_draw_callback_set"]
    pub fn draw_callback_set(view_port: *mut ViewPort, callback: ViewPortDrawCallback, context: *mut c_void);
    #[link_name = "view_port_input_callback_set"]
    pub fn input_callback_set(view_port: *mut ViewPort, callback: ViewPortInputCallback, context: *mut c_void);
    #[link_name = "view_port_update"]
    pub fn update(view_port: *mut ViewPort);
}