Bug 709

Summary:	Texturing with Newt and FBO flag partly corrupt
Product:	[JogAmp] Jogl	Reporter:	Maik <maik.riechert>
Component:	opengl	Assignee:	Sven Gothel <sgothel>
Status:	RESOLVED INVALID
Severity:	enhancement	CC:	gouessej
Priority:	P5
Version:	2
Hardware:	All
OS:	all
Type:	---	SCM Refs:	4934f1801ba44d20353652f9ee3686a13323fb74
Workaround:	---
Attachments:	self-contained main() test first and second frame third frame

Description Maik 2013-03-22 21:06:45 CET

Created attachment 435 [details]
self-contained main() test

This report is a continuation of this thread:
http://www.ardor3d.com/forums/viewtopic.php?f=10&t=12582

I transformed my Ardor3D test code (with the teapot) to pure JOGL code as good as I could. Although I haven't replicated it 1:1, the desired effects are visible.

My use case is rendering single frames and saving them to files.

When setting caps.setFBO(true); and using a texture from a file [1], then subsequent frames corrupt the texture/scene. I don't think it is really related to using a texture from a file. The only thing I noticed was that everything is fine when I use a self-generated 1D stripe texture (also in the code).

Please confirm if you see the same effects.

I use jogl 2.0rc11 and do tests on Windows atm, although I remember seeing similar problems on Linux when I tried FBOs a while ago.


[1] https://raw.github.com/Renanse/Ardor3D/master/ardor3d-examples/src/main/resources/com/ardor3d/example/media/images/ardor3d_white_256.jpg

Comment 1 Maik 2013-03-22 21:07:35 CET

Created attachment 436 [details]
first and second frame

Comment 2 Maik 2013-03-22 21:08:09 CET

Created attachment 437 [details]
third frame

Comment 3 Sven Gothel 2013-04-06 06:24:10 CEST

Bug 709: Testing texured demo w/ FBO, comparing w/ onscreen - No corruption.

Put your demo in our unit tests, while rendering it onscreen and w/ FBO.
Screenshots show now difference.

Comment 4 Maik 2013-04-06 08:53:20 CEST

Why did you mark this as invalid? Are you saying my code was partially wrong and you fixed it? Does the problem happen on your machine when you use my original class as-is?

Comment 5 Sven Gothel 2013-04-06 14:39:23 CEST

(In reply to comment #4)
> Why did you mark this as invalid? Are you saying my code was partially wrong
> and you fixed it? Does the problem happen on your machine when you use my
> original class as-is?

The only semantical GL change I did was to do a 
  tex.bind(..)
  glEnable(TEX..2D)

maybe this was the issue, I don't know.

FBO deals w/ textures, hence texture selection should happen always.

Invalid, b/c it's not a JOGL bug itself, but more a misunderstanding of usage.

However, we can discuss this further, i.e. how to avoid or notify people to avoid it.

Pls also note that we have tons of GLAutoDrawable test w/ on- and offscreen [fbo, pbuffer]
testing this - you may check those results/code as well 
 com.jogamp.opengl.test.junit.jogl.acore.Test*GLAutoDrawable*