From 2a87244ae3450496120917af1d95d8e833fa270a Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Sat, 7 Sep 2024 16:50:14 +0200
Subject: [PATCH] Add support of GL with Wayland for Linux on Apple hardware

---
 src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx b/src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx
index 09758e422..384c4a205 100644
--- a/src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx
+++ b/src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx
@@ -209,6 +209,11 @@ void Fl_Wayland_Gl_Window_Driver::set_gl_context(Fl_Window* w, GLContext context
       Fl::error("eglMakeCurrent() failed\n");
     }
   }
+  if (!(mode() & FL_ALPHA)) { // useful at least for Linux on MacBook hardware
+    GLfloat vals[4];
+    glGetFloatv(GL_COLOR_CLEAR_VALUE, vals);
+    if (vals[3] == 0.) glClearColor(vals[0], vals[1], vals[2], 1.);
+  }
 }
 
 /* CONTROL_LEAKING_SUB_GL_WINDOWS