feat: only redraw when neccessary

build.zig.zon

@@ -16,8 +16,8 @@
     // internet connectivity.
     .dependencies = .{
         .seizer = .{
-            .url = "https://github.com/leroycep/seizer/archive/e065ae24f5ae4be546c6f1eb170677b0ac835452.tar.gz",
+            .url = "https://github.com/leroycep/seizer/archive/78cba44f8d07492cb84939ad836746f7d82ae5e2.tar.gz",
-            .hash = "12200e611cb9ea7aa15b43cc52a6ff31aa8dbcf33a360c858ea237a6df102ee8da6d",
+            .hash = "1220cbae20222089c1ec9b847ef3466f13a665707e8d0e8ea2b57ffda083fd9275b6",
         },
     },
     .paths = .{

src/main.zig

@@ -24,6 +24,8 @@ var current_menu_fn: ?MenuFn = null;
 var win_count: ?u32 = null;
 var win_triggered: bool = false;
 var frame_count: u64 = 0;
+var draw_required: bool = true;
+var previous_framebuffer_size: [2]f32 = .{ 0, 0 };
 
 pub fn init() !void {
     prng = std.rand.DefaultPrng.init(@bitCast(std.time.timestamp()));
@@ -179,6 +181,17 @@ fn render(window: seizer.Window) !void {
 
         resetHistory();
         win_triggered = true;
+        draw_required = true;
+    }
+
+    const framebuffer_size = window.getFramebufferSize();
+
+    if (!std.mem.eql(f32, &framebuffer_size, &previous_framebuffer_size)) {
+        draw_required = true;
+    }
+
+    if (!draw_required) {
+        return;
     }
 
     gl.clearColor(0.2, 0.4, 0.2, 1.0);
@@ -186,7 +199,7 @@ fn render(window: seizer.Window) !void {
 
     canvas.begin(.{
         .window_size = window.getSize(),
-        .framebuffer_size = window.getFramebufferSize(),
+        .framebuffer_size = framebuffer_size,
     });
 
     const scale: u32 = if (canvas.window_size[1] <= 400) 1 else 2;
@@ -400,6 +413,8 @@ fn render(window: seizer.Window) !void {
 
     canvas.end();
 
+    try window.swapBuffers();
+
     frame_count +%= 1;
 }
 
@@ -414,26 +429,9 @@ pub fn haveWon() bool {
     return true;
 }
 
-pub fn makeStandardDeck(allocator: std.mem.Allocator) ![]Card {
-    var deck = try allocator.alloc(Card, 52);
-    errdefer allocator.free(deck);
-
-    var next_index: usize = 0;
-    for (0..4) |suit| {
-        for (1..14) |rank| {
-            deck[next_index] = Card{
-                .suit = @enumFromInt(suit),
-                .rank = @intCast(rank),
-            };
-            next_index += 1;
-        }
-    }
-
-    return deck;
-}
-
 pub fn deselect(pressed: bool) !void {
     if (!pressed) return;
+    draw_required = true;
     if (current_menu_fn) |menu_fn| {
         try menu_fn(.deselect);
     }
@@ -444,6 +442,7 @@ pub fn deselect(pressed: bool) !void {
 
 pub fn doSelectOrPlace(pressed: bool) !void {
     if (!pressed) return;
+    draw_required = true;
     if (current_menu_fn) |menu_fn| {
         try menu_fn(.select);
         return;
@@ -590,6 +589,7 @@ pub fn doSelectOrPlace(pressed: bool) !void {
 
 pub fn moveLeft(pressed: bool) !void {
     if (!pressed) return;
+    draw_required = true;
     if (current_menu_fn) |menu_fn| {
         _ = menu_fn;
         return;
@@ -620,6 +620,7 @@ pub fn moveLeft(pressed: bool) !void {
 
 pub fn moveRight(pressed: bool) !void {
     if (!pressed) return;
+    draw_required = true;
     if (current_menu_fn) |menu_fn| {
         _ = menu_fn;
         return;
@@ -650,6 +651,7 @@ pub fn moveRight(pressed: bool) !void {
 
 pub fn moveUp(pressed: bool) !void {
     if (!pressed) return;
+    draw_required = true;
 
     if (current_menu_fn) |menu_fn| {
         return try menu_fn(.up);
@@ -687,6 +689,7 @@ pub fn moveUp(pressed: bool) !void {
 
 pub fn moveDown(pressed: bool) !void {
     if (!pressed) return;
+    draw_required = true;
     if (current_menu_fn) |menu_fn| {
         return try menu_fn(.down);
     }
@@ -722,6 +725,7 @@ pub fn moveDown(pressed: bool) !void {
 
 pub fn undo(pressed: bool) !void {
     if (!pressed) return;
+    draw_required = true;
     if (history.items.len > 1) {
         _ = history.pop();
 
@@ -734,6 +738,7 @@ pub fn undo(pressed: bool) !void {
 
 pub fn toggleMenu(pressed: bool) !void {
     if (!pressed) return;
+    draw_required = true;
     if (current_menu_fn == null) {
         current_menu_fn = menuMain;
     } else {