Improve video layer rendering on macOS

Refactored glUpdate to use requestRedraw method for better control. Added needsRedraw flag to prevent redundant display calls. Enabled asynchronous drawing on VideoLayer for improved performance. Modified displayLinkCallback to only report swap without triggering display to avoid flooding the main thread.

macOS/VideoLayer.swift

@@ -5,11 +5,15 @@ import OpenGL.GL3
 
 final class VideoLayer: CAOpenGLLayer {
     var client: MPVClient!
+    private var needsRedraw = false
+    private let redrawQueue = DispatchQueue(label: "com.yattee.videolayer.redraw", qos: .userInteractive)
 
     override init() {
         super.init()
         autoresizingMask = [.layerWidthSizable, .layerHeightSizable]
         backgroundColor = NSColor.black.cgColor
+        // Enable asynchronous drawing for better performance
+        isAsynchronous = true
     }
 
     @available(*, unavailable)
@@ -32,6 +36,8 @@ final class VideoLayer: CAOpenGLLayer {
         forLayerTime _: CFTimeInterval,
         displayTime _: UnsafePointer<CVTimeStamp>?
     ) {
+        needsRedraw = false
+        
         var i: GLint = 0
         var flip: CInt = 1
         var ditherDepth = 8
@@ -92,13 +98,23 @@ final class VideoLayer: CAOpenGLLayer {
     }
 
     override func display() {
+        // Mark as needing display without blocking
+        guard !needsRedraw else { return }
+        needsRedraw = true
         super.display()
-        CATransaction.flush()
+    }
+    
+    func requestRedraw() {
+        // Called from MPV's glUpdate callback - use setNeedsDisplay for efficient batching
+        DispatchQueue.main.async { [weak self] in
+            self?.setNeedsDisplay()
+        }
     }
 
     let displayLinkCallback: CVDisplayLinkOutputCallback = { _, _, _, _, _, displayLinkContext -> CVReturn in
         let layer: VideoLayer = unsafeBitCast(displayLinkContext, to: VideoLayer.self)
         if layer.client?.mpvGL != nil {
+            // Just report swap - don't trigger display here to avoid flooding main thread
             mpv_render_context_report_swap(layer.client.mpvGL)
         }
         return kCVReturnSuccess