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

use crate::{GLContext, GLTextureBuilder, MemoryFormat, Texture};
use glib::{prelude::*, translate::*};

#[cfg(not(feature = "gl"))]
pub type GLsync = *const libc::c_void;

#[cfg(feature = "gl")]
pub use gl::types::GLsync;

impl GLTextureBuilder {
    /// Builds a new [`Texture`][crate::Texture] with the values set up in the builder.
    ///
    /// The `destroy` function gets called when the returned texture gets released;
    /// either when the texture is finalized or by an explicit call to
    /// [`GLTexture::release()`][crate::GLTexture::release()]. It should release all GL resources associated
    /// with the texture, such as the [`id`][struct@crate::GLTextureBuilder#id] and the
    /// [`sync`][struct@crate::GLTextureBuilder#sync].
    ///
    /// Note that it is a programming error to call this function if any mandatory
    /// property has not been set.
    ///
    /// It is possible to call this function multiple times to create multiple textures,
    /// possibly with changing properties in between.
    ///
    /// # Returns
    ///
    /// a newly built [`Texture`][crate::Texture]
    #[doc(alias = "gdk_gl_texture_builder_build")]
    #[must_use = "The builder must be built to be used"]
    pub unsafe fn build(self) -> Texture {
        from_glib_full(ffi::gdk_gl_texture_builder_build(
            self.to_glib_none().0,
            None,
            std::ptr::null_mut(),
        ))
    }

    #[doc(alias = "gdk_gl_texture_builder_build")]
    #[must_use = "The builder must be built to be used"]
    pub unsafe fn build_with_release_func<F: FnOnce() + 'static>(self, release_func: F) -> Texture {
        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);
        from_glib_full(ffi::gdk_gl_texture_builder_build(
            self.to_glib_none().0,
            Some(destroy_closure::<F>),
            Box::into_raw(released_func) as glib::ffi::gpointer,
        ))
    }

    /// Sets the context to be used for the texture. This is the context that owns
    /// the texture.
    ///
    /// The context must be set before calling [`build()`][Self::build()].
    /// ## `context`
    /// The context the texture beongs to or [`None`] to unset
    #[doc(alias = "gdk_gl_texture_builder_set_context")]
    pub fn set_context(self, context: Option<&impl IsA<GLContext>>) -> Self {
        unsafe {
            ffi::gdk_gl_texture_builder_set_context(
                self.to_glib_none().0,
                context.map(|p| p.as_ref()).to_glib_none().0,
            );
        }

        self
    }

    /// Sets the format of the texture. The default is `GDK_MEMORY_R8G8B8A8_PREMULTIPLIED`.
    ///
    /// The format is the preferred format the texture data should be downloaded to. The
    /// format must be supported by the GL version of [`context`][struct@crate::GLTextureBuilder#context].
    ///
    /// GDK's texture download code assumes that the format corresponds to the storage
    /// parameters of the GL texture in an obvious way. For example, a format of
    /// `GDK_MEMORY_R16G16B16A16_PREMULTIPLIED` is expected to be stored as `GL_RGBA16`
    /// texture, and `GDK_MEMORY_G8A8` is expected to be stored as `GL_RG8` texture.
    ///
    /// Setting the right format is particularly useful when using high bit depth textures
    /// to preserve the bit depth, to set the correct value for unpremultiplied textures
    /// and to make sure opaque textures are treated as such.
    ///
    /// Non-RGBA textures need to have swizzling parameters set up properly to be usable
    /// in GSK's shaders.
    /// ## `format`
    /// The texture's format
    #[doc(alias = "gdk_gl_texture_builder_set_format")]
    pub fn set_format(self, format: MemoryFormat) -> Self {
        unsafe {
            ffi::gdk_gl_texture_builder_set_format(self.to_glib_none().0, format.into_glib());
        }

        self
    }

    /// Sets whether the texture has a mipmap. This allows the renderer and other users of the
    /// generated texture to use a higher quality downscaling.
    ///
    /// Typically, the `glGenerateMipmap` function is used to generate a mimap.
    /// ## `has_mipmap`
    /// Whether the texture has a mipmap
    #[doc(alias = "gdk_gl_texture_builder_set_has_mipmap")]
    pub fn set_has_mipmap(self, has_mipmap: bool) -> Self {
        unsafe {
            ffi::gdk_gl_texture_builder_set_has_mipmap(
                self.to_glib_none().0,
                has_mipmap.into_glib(),
            );
        }

        self
    }

    /// Sets the height of the texture.
    ///
    /// The height must be set before calling [`build()`][Self::build()].
    /// ## `height`
    /// The texture's height or 0 to unset
    #[doc(alias = "gdk_gl_texture_builder_set_height")]
    pub fn set_height(self, height: i32) -> Self {
        unsafe {
            ffi::gdk_gl_texture_builder_set_height(self.to_glib_none().0, height);
        }

        self
    }

    /// Sets the texture id of the texture. The texture id must remain unmodified
    /// until the texture was finalized. See [`build()`][Self::build()]
    /// for a longer discussion.
    ///
    /// The id must be set before calling [`build()`][Self::build()].
    /// ## `id`
    /// The texture id to be used for creating the texture
    #[doc(alias = "gdk_gl_texture_builder_set_id")]
    pub fn set_id(self, id: u32) -> Self {
        unsafe {
            ffi::gdk_gl_texture_builder_set_id(self.to_glib_none().0, id);
        }

        self
    }

    /// Sets the region to be updated by this texture. Together with
    /// [`update-texture`][struct@crate::GLTextureBuilder#update-texture] this describes an
    /// update of a previous texture.
    ///
    /// When rendering animations of large textures, it is possible that
    /// consecutive textures are only updating contents in parts of the texture.
    /// It is then possible to describe this update via these two properties,
    /// so that GTK can avoid rerendering parts that did not change.
    ///
    /// An example would be a screen recording where only the mouse pointer moves.
    /// ## `region`
    /// the region to update
    #[doc(alias = "gdk_gl_texture_builder_set_update_region")]
    pub fn set_update_region(self, region: Option<&cairo::Region>) -> Self {
        unsafe {
            ffi::gdk_gl_texture_builder_set_update_region(
                self.to_glib_none().0,
                mut_override(region.to_glib_none().0),
            );
        }

        self
    }

    /// Sets the texture to be updated by this texture. See
    /// [`set_update_region()`][Self::set_update_region()] for an explanation.
    /// ## `texture`
    /// the texture to update
    #[doc(alias = "gdk_gl_texture_builder_set_update_texture")]
    pub fn set_update_texture(self, texture: Option<&impl IsA<Texture>>) -> Self {
        unsafe {
            ffi::gdk_gl_texture_builder_set_update_texture(
                self.to_glib_none().0,
                texture.map(|p| p.as_ref()).to_glib_none().0,
            );
        }

        self
    }

    /// Sets the width of the texture.
    ///
    /// The width must be set before calling [`build()`][Self::build()].
    /// ## `width`
    /// The texture's width or 0 to unset
    #[doc(alias = "gdk_gl_texture_builder_set_width")]
    pub fn set_width(self, width: i32) -> Self {
        unsafe {
            ffi::gdk_gl_texture_builder_set_width(self.to_glib_none().0, width);
        }

        self
    }

    /// Gets the `GLsync` previously set via gdk_gl_texture_builder_set_sync().
    ///
    /// # Returns
    ///
    /// the `GLSync`
    #[doc(alias = "gdk_gl_texture_builder_get_sync")]
    #[doc(alias = "get_sync")]
    pub fn sync(&self) -> Option<GLsync> {
        let ptr = unsafe { ffi::gdk_gl_texture_builder_get_sync(self.to_glib_none().0) };
        if ptr.is_null() {
            None
        } else {
            Some(ptr as _)
        }
    }

    /// Sets the GLSync object to use for the texture.
    ///
    /// GTK will wait on this object before using the created [`Texture`][crate::Texture].
    ///
    /// The `destroy` function that is passed to [`build()`][Self::build()]
    /// is responsible for freeing the sync object when it is no longer needed.
    /// The texture builder does not destroy it and it is the callers
    /// responsibility to make sure it doesn't leak.
    /// ## `sync`
    /// the GLSync object
    #[doc(alias = "gdk_gl_texture_builder_set_sync")]
    pub fn set_sync(self, sync: Option<GLsync>) -> Self {
        let ptr = sync.unwrap_or(std::ptr::null());
        unsafe {
            ffi::gdk_gl_texture_builder_set_sync(self.to_glib_none().0, ptr as _);
        }

        self
    }
}