fixed broken bg transparency export

modules/gfx/src/gfx_object.cc

@@ -720,6 +720,7 @@ void GfxObj::Debug(unsigned int flags)
 void GfxObj::render_depth_only()
 {
   glPushAttrib(GL_ALL_ATTRIB_BITS);
+  glPushClientAttrib(GL_ALL_ATTRIB_BITS);
   glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
   glDisable(GL_LIGHTING);
   glDisable(GL_COLOR_MATERIAL);
@@ -735,6 +736,7 @@ void GfxObj::render_depth_only()
   CustomRenderGL(STANDARD_RENDER_PASS);
   CustomRenderGL(TRANSPARENT_RENDER_PASS);
   glColorMask(GL_TRUE,GL_TRUE,GL_TRUE,GL_TRUE);      
+  glPopClientAttrib();
   glPopAttrib();
 }
 

modules/gfx/src/scene.cc

@@ -438,7 +438,8 @@ void Scene::InitGL(bool full)
   glClearDepth(1.0);
 
   // background
-  glClearColor(background_.Red(),background_.Green(),background_.Blue(),background_.Alpha());
+  //glClearColor(background_.Red(),background_.Green(),background_.Blue(),background_.Alpha());
+  glClearColor(background_.Red(),background_.Green(),background_.Blue(),0.0);
   fog_color_=background_;
 
   // polygon orientation setting
@@ -582,7 +583,8 @@ void Scene::SetBackground(const Color& c)
   background_=c;
   bg_mode_=0;
   if(gl_init_) {
-    glClearColor(c.Red(),c.Green(),c.Blue(),c.Alpha());
+    //glClearColor(c.Red(),c.Green(),c.Blue(),c.Alpha());
+    glClearColor(c.Red(),c.Green(),c.Blue(),0.0);
     SetFogColor(c);
     RequestRedraw();
   }