//! OpenGL bindings.
#![deny(clippy::all, clippy::pedantic, missing_docs)]

use opengl_registry_macros::for_each_opengl_command;

for_each_opengl_command! {
    #[doc = stringify!(#gl_command_name)]
    #[allow(non_snake_case, clippy::too_many_arguments)]
    pub unsafe fn #gl_command_name_noprefix(#gl_command_args) -> #gl_command_ret_type {
        type GLFunc =
            unsafe extern "C" fn(#gl_command_arg_types) -> #gl_command_ret_type;

        let gl_func = std::mem::transmute::<_, GLFunc>(functions::#gl_command_name);

        gl_func(#gl_command_arg_names)
    }
}

mod ffi
{
    #![allow(
        non_upper_case_globals,
        non_camel_case_types,
        non_snake_case,
        unused,
        missing_docs,
        clippy::unreadable_literal
    )]

    include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
}

pub use ffi::*;

/// Loads OpenGL function pointers using the given function address retriever function.
pub fn load_with<GetProcAddrFn>(get_proc_addr: GetProcAddrFn)
where
    GetProcAddrFn: Fn(&str) -> unsafe extern "C" fn(),
{
    for_each_opengl_command! {
        unsafe {
            functions::#gl_command_name = get_proc_addr(stringify!(#gl_command_name));
        }
    };
}

mod functions
{
    use opengl_registry_macros::for_each_opengl_command;

    for_each_opengl_command!(
        #[doc = stringify!(#gl_command_name)]
        #[allow(non_upper_case_globals)]
        pub static mut #gl_command_name: unsafe extern "C" fn() = function_not_loaded;
    );

    extern "C" fn function_not_loaded()
    {
        panic!("OpenGL function not loaded");
    }
}