init gtk app

nix/devshell.nix

@@ -22,6 +22,7 @@
 , expat
 , fontconfig
 , freetype
+, glib
 , gtk4
 , harfbuzz
 , libpng
@@ -56,6 +57,7 @@ let
     libXrandr
 
     gtk4
+    glib
   ];
 in mkShell rec {
   name = "ghostty";
@@ -108,6 +110,7 @@ in mkShell rec {
 
     # Only needed for GTK builds
     gtk4
+    glib
   ];
 
   # This should be set onto the rpath of the ghostty binary if you want

src/App.zig

@@ -125,10 +125,11 @@ pub fn destroy(self: *App) void {
     self.windows.deinit(self.alloc);
     if (Darwin.enabled) self.darwin.deinit();
     self.mailbox.destroy(self.alloc);
-    self.alloc.destroy(self);
 
     // Close our windowing runtime
     self.runtime.terminate();
+
+    self.alloc.destroy(self);
 }
 
 /// Wake up the app event loop. This should be called after any messages
@@ -164,7 +165,7 @@ pub fn tick(self: *App) !void {
         i += 1;
     }
 
-    // Drain our mailbox only if we're not quitting.
+    // // Drain our mailbox only if we're not quitting.
     if (!self.quit) try self.drainMailbox();
 }
 

src/apprt/gtk.zig

@@ -4,6 +4,9 @@ const std = @import("std");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
 const Allocator = std.mem.Allocator;
+const apprt = @import("../apprt.zig");
+const CoreApp = @import("../App.zig");
+const CoreWindow = @import("../Window.zig");
 
 pub const c = @cImport({
     @cInclude("gtk/gtk.h");
@@ -17,29 +20,111 @@ pub const App = struct {
         id: [:0]const u8 = "com.mitchellh.ghostty",
     };
 
+    app: *c.GtkApplication,
+    ctx: *c.GMainContext,
+
     pub fn init(opts: Options) !App {
-        const app = c.gtk_application_new(opts.id.ptr, c.G_APPLICATION_DEFAULT_FLAGS);
+        const app = @ptrCast(?*c.GtkApplication, c.gtk_application_new(
+            opts.id.ptr,
+            c.G_APPLICATION_DEFAULT_FLAGS,
+        )) orelse return error.GtkInitFailed;
         errdefer c.g_object_unref(app);
-        return .{};
+
+        // We don't use g_application_run, we want to manually control the
+        // loop so we have to do the same things the run function does:
+        // https://github.com/GNOME/glib/blob/a8e8b742e7926e33eb635a8edceac74cf239d6ed/gio/gapplication.c#L2533
+        const ctx = c.g_main_context_default() orelse return error.GtkContextFailed;
+        if (c.g_main_context_acquire(ctx) == 0) return error.GtkContextAcquireFailed;
+        errdefer c.g_main_context_release(ctx);
+
+        const gapp = @ptrCast(*c.GApplication, app);
+        var err_: ?*c.GError = null;
+        if (c.g_application_register(
+            gapp,
+            null,
+            @ptrCast([*c][*c]c.GError, &err_),
+        ) == 0) {
+            if (err_) |err| {
+                log.warn("error registering application: {s}", .{err.message});
+                c.g_error_free(err);
+            }
+            return error.GtkApplicationRegisterFailed;
+        }
+
+        c.g_application_activate(gapp);
+
+        return .{ .app = app, .ctx = ctx };
     }
 
     pub fn terminate(self: App) void {
-        _ = self;
+        c.g_settings_sync();
+        while (c.g_main_context_iteration(self.ctx, 0) != 0) {}
+        c.g_main_context_release(self.ctx);
+        c.g_object_unref(self.app);
     }
 
     pub fn wakeup(self: App) !void {
         _ = self;
+        c.g_main_context_wakeup(null);
     }
 
     pub fn wait(self: App) !void {
-        _ = self;
+        _ = c.g_main_context_iteration(self.ctx, 1);
     }
 };
 
 pub const Window = struct {
     pub const Options = struct {};
 
+    pub fn init(app: *const CoreApp, core_win: *CoreWindow, opts: Options) !Window {
+        _ = app;
+        _ = core_win;
+        _ = opts;
+
+        return .{};
+    }
+
     pub fn deinit(self: *Window) void {
         _ = self;
     }
+
+    pub fn setShouldClose(self: *Window) void {
+        _ = self;
+    }
+
+    pub fn shouldClose(self: *const Window) bool {
+        _ = self;
+        return false;
+    }
+
+    pub fn getContentScale(self: *const Window) !apprt.ContentScale {
+        _ = self;
+        return .{ .x = 1, .y = 1 };
+    }
+
+    pub fn getSize(self: *const Window) !apprt.WindowSize {
+        _ = self;
+        return .{ .width = 800, .height = 600 };
+    }
+
+    pub fn setSizeLimits(self: *Window, min: apprt.WindowSize, max_: ?apprt.WindowSize) !void {
+        _ = self;
+        _ = min;
+        _ = max_;
+    }
+
+    pub fn setTitle(self: *Window, slice: [:0]const u8) !void {
+        _ = self;
+        _ = slice;
+    }
+
+    pub fn getClipboardString(self: *const Window) ![:0]const u8 {
+        _ = self;
+        return "";
+    }
+
+    pub fn setClipboardString(self: *const Window, val: [:0]const u8) !void {
+        _ = self;
+        _ = val;
+    }
 };

src/main.zig

@@ -101,9 +101,9 @@ pub fn main() !void {
     // Run our app with a single initial window to start.
     var app = try App.create(alloc, .{}, &config);
     defer app.destroy();
+    try app.run();
     if (build_config.app_runtime == .gtk) return;
     _ = try app.newWindow(.{});
-    try app.run();
 }
 
 // Required by tracy/tracy.zig to enable/disable tracy support.

src/renderer/OpenGL.zig

@@ -444,6 +444,7 @@ pub fn threadEnter(self: *const OpenGL, win: apprt.runtime.Window) !void {
 /// Callback called by renderer.Thread when it exits.
 pub fn threadExit(self: *const OpenGL) void {
     _ = self;
+    if (apprt.runtime == apprt.gtk) @panic("TODO");
 
     gl.glad.unload();
     glfw.makeContextCurrent(null);
@@ -569,6 +570,7 @@ pub fn render(
 
         // Build our devmode draw data
         const devmode_data = devmode_data: {
+            if (DevMode.enabled) {
                 if (state.devmode) |dm| {
                     if (dm.visible) {
                         imgui.ImplOpenGL3.newFrame();
@@ -577,6 +579,7 @@ pub fn render(
                         break :devmode_data try dm.render();
                     }
                 }
+            }
 
             break :devmode_data null;
         };
@@ -639,11 +642,14 @@ pub fn render(
     try self.draw();
 
     // If we have devmode, then render that
+    if (DevMode.enabled) {
         if (critical.devmode_data) |data| {
             imgui.ImplOpenGL3.renderDrawData(data);
         }
+    }
 
     // Swap our window buffers
+    if (apprt.runtime == apprt.gtk) @panic("TODO");
     win.window.swapBuffers();
 }