macOS: Use Metal on >60 Hz displays

The problem with the occasional stutters related to SDL_WaitEvent() are still there, but on a 120 Hz display it's even worse to be stuck on 60 Hz. Metal is required for 120 Hz.

2 files changed, 4 insertions, 3 deletions

diff --git a/res/about/version.gmi b/res/about/version.gmi
index 8de16a87..9fa25707 100644
--- a/res/about/version.gmi
+++ b/res/about/version.gmi
@@ -11,6 +11,7 @@
 * Fixed how the ANSI FG color is adjusted to keep text legible on dark or bright backgrounds when BG color is unset.
 * Fixed possible crash when there are ANSI escapes in the alt text of a preformatted block.
 * Fixed tab/window titles containing ANSI escapes (escapes are removed).
+* macOS: Use Metal for drawing graphics if display refresh rate is higher than 60 Hz.
 
 ## 1.10.3
 * Unix: Added a lagrange(1) manual page.
diff --git a/src/macos.m b/src/macos.m
index 1019d13d..ad236784 100644
--- a/src/macos.m
+++ b/src/macos.m
@@ -72,10 +72,10 @@ static NSString *currentSystemAppearance_(void) {
 }
 
 iBool shouldDefaultToMetalRenderer_MacOS(void) {
-    /* TODO: Test if SDL 2.0.16 works better (no stutters with Metal?). */
-    return iFalse; /*
     const iInt2 ver = macVer_();
-    return ver.x > 10 || ver.y > 13;*/
+    SDL_DisplayMode dispMode;
+    SDL_GetDesktopDisplayMode(0, &dispMode);
+    return dispMode.refresh_rate > 60 && (ver.x > 10 || ver.y > 13);
 }
 
 static void ignoreImmediateKeyDownEvents_(void) {