layer-shika/src/windowing/globals.rs

use crate::{bind_globals, errors::LayerShikaError};
use log::info;
use smithay_client_toolkit::reexports::protocols_wlr::layer_shell::v1::client::zwlr_layer_shell_v1::ZwlrLayerShellV1;
use wayland_client::{
    globals::registry_queue_init,
    protocol::{wl_compositor::WlCompositor, wl_output::WlOutput, wl_seat::WlSeat},
    Connection, QueueHandle,
};
use wayland_protocols::wp::fractional_scale::v1::client::wp_fractional_scale_manager_v1::WpFractionalScaleManagerV1;
use wayland_protocols::wp::viewporter::client::wp_viewporter::WpViewporter;

use super::state::WindowState;

pub struct GlobalCtx {
    pub compositor: WlCompositor,
    pub output: WlOutput,
    pub layer_shell: ZwlrLayerShellV1,
    pub seat: WlSeat,
    pub fractional_scale_manager: Option<WpFractionalScaleManagerV1>,
    pub viewporter: Option<WpViewporter>,
}

impl GlobalCtx {
    pub fn initialize(
        connection: &Connection,
        queue_handle: &QueueHandle<WindowState>,
    ) -> Result<Self, LayerShikaError> {
        let global_list = registry_queue_init::<WindowState>(connection)
            .map(|(global_list, _)| global_list)
            .map_err(|e| LayerShikaError::GlobalInitialization(e.to_string()))?;

        let (compositor, output, layer_shell, seat) = bind_globals!(
            &global_list,
            queue_handle,
            (WlCompositor, compositor, 3..=6),
            (WlOutput, output, 1..=4),
            (ZwlrLayerShellV1, layer_shell, 1..=5),
            (WlSeat, seat, 1..=9)
        )?;

        let fractional_scale_manager = global_list
            .bind::<WpFractionalScaleManagerV1, _, _>(queue_handle, 1..=1, ())
            .ok();

        let viewporter = global_list
            .bind::<WpViewporter, _, _>(queue_handle, 1..=1, ())
            .ok();

        if fractional_scale_manager.is_none() {
            info!("Fractional scale protocol not available, using integer scaling");
        }

        if viewporter.is_none() {
            info!("Viewporter protocol not available");
        }

        Ok(Self {
            compositor,
            output,
            layer_shell,
            seat,
            fractional_scale_manager,
            viewporter,
        })
    }
}