commit c3011e32e43bd4fa986e9b9a220c7d28bb958c2c
Author:     ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
AuthorDate: Thu Nov 24 15:48:39 2022 +0100
Commit:     ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
CommitDate: Thu Nov 24 15:48:39 2022 +0100

    Improve text drawing above GL3 scene under macOS

 src/drivers/Cocoa/Fl_Cocoa_Gl_Window_Driver.mm | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git src/drivers/Cocoa/Fl_Cocoa_Gl_Window_Driver.mm src/drivers/Cocoa/Fl_Cocoa_Gl_Window_Driver.mm
index 626600e..2420d12 100644
--- src/drivers/Cocoa/Fl_Cocoa_Gl_Window_Driver.mm
+++ src/drivers/Cocoa/Fl_Cocoa_Gl_Window_Driver.mm
@@ -255,10 +255,14 @@ void Fl_Cocoa_Gl_Window_Driver::after_show() {
     NSView *view = [fl_mac_xid(pWindow) contentView];
     NSView *gl1view = [[NSView alloc] initWithFrame:[view frame]];
     [gl1view setAutoresizingMask:NSViewWidthSizable|NSViewHeightSizable];
-    NSOpenGLPixelFormat *gl1pixelformat = mode_to_NSOpenGLPixelFormat(
+    static NSOpenGLContext *shared_gl1_ctxt = nil;
+    static NSOpenGLPixelFormat *gl1pixelformat = mode_to_NSOpenGLPixelFormat(
                                 FL_RGB8 | FL_ALPHA | FL_SINGLE, NULL);
-    gl1ctxt = [[NSOpenGLContext alloc] initWithFormat:gl1pixelformat shareContext:nil];
-    [gl1pixelformat release];
+    gl1ctxt = [[NSOpenGLContext alloc] initWithFormat:gl1pixelformat shareContext:shared_gl1_ctxt];
+    if (!shared_gl1_ctxt) {
+      shared_gl1_ctxt = gl1ctxt;
+      [shared_gl1_ctxt retain];
+    }
     [view addSubview:gl1view];
   #if MAC_OS_X_VERSION_MAX_ALLOWED > MAC_OS_X_VERSION_10_7
     if (fl_mac_os_version >= 100700 && Fl::use_high_res_GL()) {