Strange result in RenderToTexture + GUI

[greenya]

Hello!

I see very strange result when using render-to-texture and the GUI. This problem repeats only on OpenGL driver. Probably this is a bug.

Test case:
Open main.cpp of 13.RenderToTexture_vc9 project:
- just before "int lastFPS = -1;" we add:

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env->addImage(driver->getTexture("../../media/irrlichtlogo2.png"),
   core::position2d<s32>(10,10));

- just before "driver->setRenderTarget(0, true, true, 0);" we add:

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env->drawAll();

So we simply added one GUIImage (Irrlicht logo) and instruction to render GUI to target texture.

I'm getting next result:
http://www.youtube.com/watch?v=csLMGu4GN7I
(Notice flipping of Irrlicht logo when i rotate camera)

Indeed when i use more GUI, for example buttons, we get more strange results (i believe thats because font is a texture, and the problem in texture usage, the flipping). For example i getting next result after some camera movement:

(Notice broken text/font on the button)

[Lonesome Ducky]

Hmm. I just tried it out and it seems that it is incorrect even if you render the gui environment AFTER and not during the render to texture. Odd. I'll try some things and get back to you

EDIT: To add, it ONLY occurs when the test cube is visible and uses the render texture on its material.

[CuteAlien]

Interesting, but no idea right now. I've moved this to the bug report forum.

[xDan]

I'm getting this problem in the 1.7.2. Did anyone find a fix?

Something about calling setRenderTarget with a RTT in OpenGL is messing up the GUI rendering.

The problem doesn't occur in 1.6.1, which I've been using until today...

[xDan]

Ok, well I'm afraid I've no idea the cause of the problem, but putting this:

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   video::SMaterial mat;
   driver->setMaterial(mat);

...just before the GUI render fixes it.

I suppose this is resetting some state or other that got messed up somehow...!?

P.S. Thanks greenya for posting this issue, I would never have realised the RTT stuff was the problem!