U++ forum: Welcome to the forum

Search on this site

Search in forums

Home » Community » Newbie corner » OpenGL example

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

OpenGL example [message #27355]

Wed, 14 July 2010 09:42

281264
Messages: 270
Registered: June 2010
Location: Spain

Experienced Member

Hi,

I have examined the OpenGL example and I have some questions, which I show here. I will be grateful if someone answers them:

1.- The examples uses GLCtrl struc; where in the manual is this widget described?
2.- I seen that the �typical� code chunk for allowing correct window resizing is not needed (not used); does this means that somehow this code is built in within GLCtrl class?
Note: I am referring to the typical �reshape� function.
3.- It seems that when the window is resized a nasty flicker happens; how this can be eliminated?
4.- How the different releases of Open can be selected? For instance, if I decide to use the reseal 3.1, how can I select it?

Many thanks and my best wishes.

Javier

Report message to a moderator

Re: OpenGL example [message #27357 is a reply to message #27355]

Wed, 14 July 2010 12:17

mrjt
Messages: 705
Registered: March 2007
Location: London

Contributor

1. GLCtrl is undocumented, it's not really a core component of Upp. But it doesn't do anything too complicated, just creates a GL context bound to a native window (normally Upp ctrls aren't attached to native windows)
2. GLCtrl::StdView() contains the viewport definition code. In the example this is called in GLPaint, though you would normally override GLResize() and call it there.
3. Remove the line Ctrl::GlobalBackPaint() from the Main function in main.cpp. I don't know why that line is there, it's clearly incorrect.
4. The version of OpenGL you use is just which extensions you use. The version of you GL libs is defined somewhere in gl.h. I'd recommend using Glew if you want to use extensions, it makes it much easier.

The GLCtrl is really just a starting point, if you want to do anything serious you will need to modify it considerably. One thing that you will probably need is a public method to activate the drawing context since in a GUI app things like opening a Prompt window can change the context. You will also want your own viewport/perspective code and a whole lot of other stuff.

[Updated on: Wed, 14 July 2010 12:18]

Report message to a moderator