Offending code identified. ...I decided to roll the dice and went back to the fix for issue # 1481. Below is the code changes that I made to CtrlDraw.cpp. For compiling the OpenGL demo, NOGTK was specified and vola, the demo worked!

Changes made to CtrlDraw.cpp, starting at line 595:

void Ctrl::UpdateArea0(SystemDraw& draw, const Rect& clip, int backpaint)
{
	GuiLock __;
	LTIMING("UpdateArea");
	LLOG("========== UPDATE AREA " << UPP::Name(this) << " " << clip << " ==========");
//      ExcludeDHCtrls(draw, GetRect().GetSize(), clip);
	if(globalbackbuffer) {
		CtrlPaint(draw, clip);
		LLOG("========== END (TARGET IS BACKBUFFER)");
		return;
	}
/*
	if(backpaint == FULLBACKPAINT || globalbackpaint) {
		ShowRepaintRect(draw, clip, LtRed());
		BackDraw bw;
		bw.Create(draw, clip.GetSize());
		bw.Offset(-clip.TopLeft());
		bw.SetPaintingDraw(draw, clip.TopLeft());
		CtrlPaint(bw, clip);
		bw.Put(draw, clip.TopLeft());
		LLOG("========== END (FULLBACKPAINT)");
		return;
	}
*/
	if(backpaint == TRANSPARENTBACKPAINT) {
		LLOG("TransparentBackpaint");
		Vector<Rect> area;
		GatherTransparentAreas(area, draw, GetRect().GetSize(), clip);

Line 600, "ExcludeDHCtrls(..." was commented out as specified in issue ticket, 1481.

As for the commented block of code, this was a gamble, a bit of a hunch, since in issue ticket 1481, the following change had originally been specified:

-	if(backpaint == FULLBACKPAINT || globalbackpaint/* && !hasdhctrl && !dynamic_cast<DHCtrl *>(this)*/) {
+	if(backpaint == FULLBACKPAINT || globalbackpaint && !hasdhctrl && !dynamic_cast<DHCtrl *>(this)) {

Since if I recall that hasdhctrl is no longer defined, I wondered if just commenting out that block of code would make a difference. It appears to have done so. I'd attach a screen shot of the working demo, but have a cap of one attachment per message.




Peter