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// Take a look at the license at the top of the repository in the LICENSE file.

use crate::{GLContext, GLTexture, Texture};
use glib::translate::*;
use glib::Cast;

impl GLTexture {
    /// Creates a new texture for an existing GL texture.
    ///
    /// Note that the GL texture must not be modified until `destroy` is called,
    /// which will happen when the GdkTexture object is finalized, or due to
    /// an explicit call of [``release()``][`Self::release()`].
    /// ## `context`
    /// a [`GLContext`][crate::GLContext]
    /// ## `id`
    /// the ID of a texture that was created with `context`
    /// ## `width`
    /// the nominal width of the texture
    /// ## `height`
    /// the nominal height of the texture
    ///
    /// # Returns
    ///
    /// A newly-created [`Texture`][crate::Texture]
    #[doc(alias = "gdk_gl_texture_new")]
    pub unsafe fn new(context: &GLContext, id: u32, width: i32, height: i32) -> Self {
        let ptr = ffi::gdk_gl_texture_new(
            context.to_glib_none().0,
            id,
            width,
            height,
            None,
            std::ptr::null_mut(),
        );
        Texture::from_glib_full(ptr).unsafe_cast()
    }

    #[doc(alias = "gdk_gl_texture_new")]
    pub unsafe fn with_release_func<F: FnOnce() + 'static>(
        context: &GLContext,
        id: u32,
        width: i32,
        height: i32,
        release_func: F,
    ) -> Self {
        unsafe extern "C" fn destroy_closure<F: FnOnce() + 'static>(func: glib::ffi::gpointer) {
            let released_func = Box::<F>::from_raw(func as *mut _);
            released_func();
        }
        let released_func = Box::new(release_func);
        let ptr = ffi::gdk_gl_texture_new(
            context.to_glib_none().0,
            id,
            width,
            height,
            Some(destroy_closure::<F>),
            Box::into_raw(released_func) as glib::ffi::gpointer,
        );
        Texture::from_glib_full(ptr).unsafe_cast()
    }
}