From 3dc131d4faf67bd0c57a340e39037a6279dc4ce7 Mon Sep 17 00:00:00 2001
From: iddev5 <ayushbardhan5@gmail.com>
Date: Fri, 10 Jun 2022 23:36:06 +0530
Subject: [PATCH] mach: Implement fullscreen window support for native
 platforms (glfw)

This feature remembers the last position of window before turning to
fullscreen.
---
 src/platform/native.zig | 12 ++++++++++++
 src/structs.zig         |  3 +++
 2 files changed, 15 insertions(+)

diff --git a/src/platform/native.zig b/src/platform/native.zig
index e910a499..61b63235 100644
--- a/src/platform/native.zig
+++ b/src/platform/native.zig
@@ -17,6 +17,7 @@ pub const Platform = struct {
 
     last_window_size: structs.Size,
     last_framebuffer_size: structs.Size,
+    last_position: glfw.Window.Pos,
     wait_event_timeout: f64 = 0.0,
 
     native_instance: gpu.NativeInstance,
@@ -178,6 +179,7 @@ pub const Platform = struct {
             .allocator = engine.allocator,
             .last_window_size = .{ .width = window_size.width, .height = window_size.height },
             .last_framebuffer_size = .{ .width = framebuffer_size.width, .height = framebuffer_size.height },
+            .last_position = try window.getPos(),
             .native_instance = native_instance,
         };
     }
@@ -292,6 +294,16 @@ pub const Platform = struct {
             @bitCast(glfw.Window.SizeOptional, options.size_min),
             @bitCast(glfw.Window.SizeOptional, options.size_max),
         );
+        if (options.fullscreen) {
+            platform.last_position = try platform.window.getPos();
+
+            const monitor = glfw.Monitor.getPrimary().?;
+            const video_mode = try monitor.getVideoMode();
+            try platform.window.setMonitor(monitor, 0, 0, video_mode.getWidth(), video_mode.getHeight(), null);
+        } else {
+            const position = platform.last_position;
+            try platform.window.setMonitor(null, position.x, position.y, options.width, options.height, null);
+        }
     }
 
     pub fn setShouldClose(platform: *Platform, value: bool) void {
diff --git a/src/structs.zig b/src/structs.zig
index 32feefa8..512377ab 100644
--- a/src/structs.zig
+++ b/src/structs.zig
@@ -31,6 +31,9 @@ pub const Options = struct {
     /// The maximum allowed size for the window.
     size_max: SizeOptional = .{ .width = null, .height = null },
 
+    /// Fullscreen window.
+    fullscreen: bool = false,
+
     /// Monitor synchronization modes.
     vsync: enums.VSyncMode = .double,