[gtk/fix-rgb-upload] gl: Fix RGB uploads

[Matthias Clasen <matthiasc src gnome org>]

commit 12f05e80aa40891ce3b7dab9d11089542f75f5d9
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Sep 25 13:15:54 2020 -0400

    gl: Fix RGB uploads
    
    I don't really know what to say, other than:
    OpenGL is terrible
    
    Fixes: #3194

 gdk/gdkglcontext.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gdk/gdkglcontext.c b/gdk/gdkglcontext.c
index f9512b0343..5614b2ce47 100644
--- a/gdk/gdkglcontext.c
+++ b/gdk/gdkglcontext.c
@@ -291,6 +291,8 @@ gdk_gl_context_upload_texture (GdkGLContext    *context,
    */
   if (stride == width * bpp)
     {
+      glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
+
       glTexImage2D (texture_target, 0, GL_RGBA, width, height, 0, gl_format, gl_type, data);
     }
   else if ((!priv->use_es ||