macos: explicitly enable modern window corners on macOS 26

Use an explicit runtime check to apply the newer corner styling on macOS 26 while leaving behavior unchanged on older macOS versions for compatibility.

Also add the required QuartzCore framework for linking the corner curve API.

Author: zzhaolei

glfw/cocoa_window.m

@@ -3918,6 +3918,29 @@ void clear_title_bar_background_views(NSWindow *window) {
 #undef tc
 }
 
+static bool
+should_use_latest_macos_window_corner_curve(void) {
+    if (@available(macOS 26.0, *)) {
+    } else return false;
+    static bool checked = false, ans = false;
+    if (!checked) {
+        NSOperatingSystemVersion v = {26, 0, 0};
+        ans = [[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion:v];
+        checked = true;
+    }
+    return ans;
+}
+
+static void
+apply_window_corner_curve_if_needed(_GLFWwindow *window) {
+    if (!window || !window->decorated || !should_use_latest_macos_window_corner_curve()) return;
+    GLFWWindow *nsw = window->ns.object;
+    NSView *frame_view = nsw.contentView.superview;
+    CALayer *layer = frame_view.layer;
+    if (!layer) return;
+    layer.cornerCurve = kCACornerCurveContinuous;
+}
+
 
 
 GLFWAPI void glfwCocoaSetWindowChrome(GLFWwindow *w, unsigned int color, bool use_system_color, unsigned int system_color, int background_blur, unsigned int hide_window_decorations, bool show_text_in_titlebar, int color_space, float background_opacity, bool resizable) { @autoreleasepool {
@@ -4033,6 +4056,7 @@ GLFWAPI void glfwCocoaSetWindowChrome(GLFWwindow *w, unsigned int color, bool us
     }
 #undef tc
     apply_titlebar_color_settings(window);
+    apply_window_corner_curve_if_needed(window);
 
     // HACK: Changing the style mask can cause the first responder to be cleared
     [nsw makeFirstResponder:window->ns.view];

glfw/glfw.py

@@ -175,7 +175,7 @@ def init_env(
 
     elif module == 'cocoa':
         ans.cppflags.append('-DGL_SILENCE_DEPRECATION')
-        for f_ in 'Cocoa IOKit CoreFoundation CoreVideo UniformTypeIdentifiers'.split():
+        for f_ in 'Cocoa IOKit CoreFoundation CoreVideo QuartzCore UniformTypeIdentifiers'.split():
             ans.ldpaths.extend(('-framework', f_))
 
     elif module == 'wayland':