update floooh/sokol@058d9b5

src/sokol/c/sokol_app.h

@@ -3560,6 +3560,7 @@ _SOKOL_PRIVATE void _sapp_macos_update_dimensions(void) {
     else {
         _sapp.dpi_scale = 1.0f;
     }
+    _sapp.macos.view.layer.contentsScale = _sapp.dpi_scale; // NOTE: needed because we set layerContentsPlacement to a non-scaling value in windowWillStartLiveResize.
     const NSRect bounds = [_sapp.macos.view bounds];
     _sapp.window_width = (int)roundf(bounds.size.width);
     _sapp.window_height = (int)roundf(bounds.size.height);
@@ -3915,6 +3916,24 @@ _SOKOL_PRIVATE void _sapp_macos_frame(void) {
     }
 }
 
+#if defined(SOKOL_METAL)
+- (void)windowWillStartLiveResize:(NSNotification *)notification {
+    // Work around the MTKView resizing glitch by "anchoring" the layer to the window corner opposite
+    // to the currently manipulated corner (or edge). This prevents the content stretching back and
+    // forth during resizing. This is a workaround for this issue: https://github.com/floooh/sokol/issues/700
+    // Can be removed if/when migrating to CAMetalLayer: https://github.com/floooh/sokol/issues/727
+    bool resizing_from_left = _sapp.mouse.x < _sapp.window_width/2;
+    bool resizing_from_top = _sapp.mouse.y < _sapp.window_height/2;
+    NSViewLayerContentsPlacement placement;
+    if (resizing_from_left) {
+        placement = resizing_from_top ? NSViewLayerContentsPlacementBottomRight : NSViewLayerContentsPlacementTopRight;
+    } else {
+        placement = resizing_from_top ? NSViewLayerContentsPlacementBottomLeft : NSViewLayerContentsPlacementTopLeft;
+    }
+    _sapp.macos.view.layerContentsPlacement = placement;
+}
+#endif
+
 - (void)windowDidResize:(NSNotification*)notification {
     _SOKOL_UNUSED(notification);
     _sapp_macos_update_dimensions();