CEGUI (Crazy Eddie's GUI) Forums

Good evening all,
I'm trying to port the cegui 0.71 code to the NeL game engine. I'm close but could use some advice.
Background:
The engine uses OpenGL. I'm experienced with graphics and programming but not OpenGL.
The problem:
It displays the mouse cursor (which is visible in the lower left corner) but does not display any of the windows.
What I've tried:
I added extra logging to try and follow the flow of the application. It looks like there's something wrong with the texture or render targets.
I believe it's trying to render the window to a texture target but I can't see it. It might be the texture is wrong, the OpenGL setup is incorrect, I'm not building
the texture correctly, etc.
I notice GeometryBuffer 3 has no geometry, GeometryBuffer 7 could be a window but displays nothing, and GeometryBuffer 1 seems to the cursor
Any suggestions would be appreciated. Thanks!
My CEGUI log:

Stating the obvious here, but you need to simplify. Pull back from "CEGUI" and work at appropriate levels until you have things working and move on to the next. So, effectively, you want to be working with the Renderer crated objects directly until you're happy they're working and then plug them back into CEGUI. Same with the render to texture stuff - definitely disable that to start with until you have basic rendering working, then add that back in afterwards.

To move into more specifics, with regards to the mouse cursor. It's in the lower left corner, the key questions here are: Is the mouse position logically in the lower left? Or in other words is it rendered in the correct position? And, is the rendered imagery correct? It's not flipped, mirrored or otherwise 'off' in some way?

As regards to the "missing" windows, as stated above, disable the use of render to texture (either artificially or by setting AutoRenderingSurface to False in the looknfeels) and get basic / normal rendering working first, then once you know you have that sorted, move on to fix the RTT stuff.

CE

Thanks CE.
Hopefully I'll get this figured out and stop bothering you guys.

Feel free to bother us Sometimes it's difficult to answer questions regarding engines or APIs which I have no knowledge or information about, but I'll always try to offer some kind of help where I can.

CE.

Woo hoo! Got it!

I found that I had the wrong opengl call.
I didn't set the default color for clearing the background, I cleared the background to a color.
As CEGUI rendered the queues each successive render was erasing the previous output.
The mouse cursor is drawn last so that was all I could see.

I didn't really get a good grasp of how the renderer classes are supposed to work from the docs.
I put a lot of the opengl drawing setup in GeometryBuffer::draw() instead of RenderTarget::activate().

Thanks for the time you put into the forums.

I'm glad you got it working!

I think I can agree that, with some hindsight, the 'overview' document is probably not detailed enough for your average person (or anyone else who is not me) to implement a renderer from scratch. Clearly there are lots of things I 'just know' which should have gone down in that doc!

CE.