From d42546dda8fdb3d044e715d0a6a1a74cd411acbe Mon Sep 17 00:00:00 2001
From: Rafostar <40623528+Rafostar@users.noreply.github.com>
Date: Mon, 5 Apr 2021 18:05:38 +0200
Subject: [PATCH] GL: Do not set backbuffer on Wayland memory copy

This aims to workaround a Mesa bug that causes crash on Intel GPUs
caused by calling "glDrawBuffer (GL_BACK)" on Wayland where
there is no actual backbuffer in GStreamer OpenGL context.
---
 gst-libs/gst/gl/gstglmemory.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/gst-libs/gst/gl/gstglmemory.c b/gst-libs/gst/gl/gstglmemory.c
index 76c04eb1b..cd3481847 100644
--- a/gst-libs/gst/gl/gstglmemory.c
+++ b/gst-libs/gst/gl/gstglmemory.c
@@ -762,7 +762,13 @@ gst_gl_memory_copy_teximage (GstGLMemory * src, guint tex_id,
     gl->DeleteFramebuffers (n_fbos, &fbo[0]);
 
     if (gl->DrawBuffer)
-      gl->DrawBuffer (GL_BACK);
+      gl->DrawBuffer (
+#if GST_GL_HAVE_WINDOW_WAYLAND
+          GL_NONE
+#else
+          GL_BACK
+#endif
+          );
   }
 
   gst_memory_unmap (GST_MEMORY_CAST (src), &sinfo);
-- 
2.28.0