From 982b0250255624e6bdf8782dcd2e7cb512f0bd4d Mon Sep 17 00:00:00 2001
From: Jaakko Keränen <jaakko.keranen@iki.fi>
Date: Tue, 20 Apr 2021 22:39:00 +0300
Subject: iOS: Fixed momentum scroll timing

The scrolling stutters were being caused by timing and not slow text rendering. Now the momentum scroll is locked to display refresh rate.
---
 src/ios.m | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

(limited to 'src/ios.m')

diff --git a/src/ios.m b/src/ios.m
index 9aca5a19..58557ef5 100644
--- a/src/ios.m
+++ b/src/ios.m
@@ -33,11 +33,20 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 static iBool isSystemDarkMode_ = iFalse;
 static iBool isPhone_          = iFalse;
 
-static UIViewController *viewController_(iWindow *window) {
+static UIWindow *uiWindow_(iWindow *window) {
     SDL_SysWMinfo wm;
     SDL_VERSION(&wm.version);
     if (SDL_GetWindowWMInfo(window->win, &wm)) {
-        return wm.info.uikit.window.rootViewController;
+        return wm.info.uikit.window;
+    }
+    iAssert(false);
+    return NULL;
+}
+
+static UIViewController *viewController_(iWindow *window) {
+    UIWindow *uiWin = uiWindow_(window);
+    if (uiWin) {
+        return uiWin.rootViewController;
     }
     iAssert(false);
     return NULL;
@@ -248,6 +257,10 @@ iBool isPhone_iOS(void) {
     return isPhone_;
 }
 
+int displayRefreshRate_iOS(void) {
+    return uiWindow_(get_Window()).screen.maximumFramesPerSecond;
+}
+
 void setupWindow_iOS(iWindow *window) {
     UIViewController *ctl = viewController_(window);
     isSystemDarkMode_ = isDarkMode_(window);
-- 
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