From ee37965fad79a815feea3f8a4a6cfec03d4a9029 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Mon, 22 Apr 2024 14:27:16 +0200
Subject:  Fix: Wayland use of alpha in glClearColor/glClear (#957)

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

diff --git a/src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx b/src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx
index 8c14912f2..00c1ab0ca 100644
--- a/src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx
+++ b/src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx
@@ -299,6 +299,7 @@ void Fl_Wayland_Gl_Window_Driver::make_current_before() {
     Fl_Wayland_Gl_Choice *g = (Fl_Wayland_Gl_Choice*)this->g();
     egl_surface = eglCreateWindowSurface(egl_display, g->egl_conf, egl_window, NULL);
     wl_surface_set_buffer_scale(surface, scale);
+    if (mode() & FL_ALPHA) wl_surface_set_opaque_region(surface, NULL);
     // Tested apps: shape, glpuzzle, cube, fractals, gl_overlay, fullscreen, unittests,
     //   OpenGL3-glut-test, OpenGL3test.
     // Tested wayland compositors: mutter, kde-plasma, weston, sway on FreeBSD.
-- 
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