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use std::ffi::c_int;
use std::ptr::null_mut;
use crate::util::is_main_thread;
use crate::{get_glfw_error, Error};
/// GLFW 3.x.x is supported
static SUPPORTED_GLFW_VERSION_MAJOR: c_int = 3;
/// Initializes GLFW and returns a initialization token.
///
/// # Errors
/// Will return `Err` if
/// - The current thread is not the main thread
/// - A GLFW error occurs
pub fn initialize() -> Result<Glfw, Error>
{
if !is_main_thread() {
return Err(Error::NotInMainThread);
}
let mut major: c_int = 0;
unsafe { crate::ffi::glfwGetVersion(&mut major, null_mut(), null_mut()) };
if major != SUPPORTED_GLFW_VERSION_MAJOR {
return Err(Error::UnsupportedVersion);
}
// SAFETY: The current thread is the main thread
let success = unsafe { crate::ffi::glfwInit() };
if success == crate::ffi::GLFW_FALSE {
get_glfw_error()?;
}
Ok(Glfw { _priv: &() })
}
/// GLFW initialization token.
#[derive(Debug)]
pub struct Glfw
{
/// This field has two purposes
/// - To make the struct not constructable without calling [`initialize`].
/// - To make the struct `!Send` and `!Sync`.
_priv: *const (),
}
impl Drop for Glfw
{
fn drop(&mut self)
{
// SAFETY: The current thread cannot be any other thread than the main thread
// since the initialize function checks it and the GLFW initialization token is
// neither Send or Sync
unsafe { crate::ffi::glfwTerminate() };
}
}
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