#565: if glEnablei is not available, disable alpha which is the only …

…place that uses it

git-svn-id: https://xpra.org/svn/Xpra/trunk@6343 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/client/gl/gl_check.py

@@ -175,6 +175,16 @@ def redirect_log(logger_name):
             glMultiTexCoord2i, \
             glVertex2i, glEnd)
 
+        glEnablei = None
+        try:
+            from OpenGL.GL import glEnablei
+        except:
+            pass
+        if not bool(glEnablei):
+            log.warn("OpenGL glEnablei is not available, disabling transparency")
+            global HAS_ALPHA
+            HAS_ALPHA = False
+
         #check for framebuffer functions we need:
         from OpenGL.GL.ARB.framebuffer_object import GL_FRAMEBUFFER, \
             GL_COLOR_ATTACHMENT0, glGenFramebuffers, glBindFramebuffer, glFramebufferTexture2D

src/xpra/client/gl/gl_window_backing.py

@@ -136,13 +136,15 @@ def py_gl_debug_callback(source, error_type, error_id, severity, length, message
 class GLPixmapBacking(GTK2WindowBacking):
 
     def __init__(self, wid, w, h, has_alpha):
-        GTK2WindowBacking.__init__(self, wid, w, h, has_alpha)
         display_mode = get_DISPLAY_MODE()
         try:
             self.glconfig = gtk.gdkgl.Config(mode=display_mode)
         except gtk.gdkgl.NoMatches:
             display_mode &= ~gtk.gdkgl.MODE_DOUBLE
             self.glconfig = gtk.gdkgl.Config(mode=display_mode)
+        if not self.glconfig.has_alpha():
+            has_alpha = False
+        GTK2WindowBacking.__init__(self, wid, w, h, has_alpha)
         self._backing = gtk.gtkgl.DrawingArea(self.glconfig)
         #restoring missed masks:
         self._backing.set_events(self._backing.get_events() | gdk.POINTER_MOTION_MASK | gdk.POINTER_MOTION_HINT_MASK)