Posted by elect on
URL: https://forum.jogamp.org/GL-TEXTURE-2D-vs-GL-TEXTURE-RECTANGLE-tp4032718.html

I have a little program that render a yellow triangle twice, once on the left half of a framebuffer and once on the right side.

Dump of the texture



Now, after that I render the content of this framebuffer on the screen

It works if I use GL_TEXTURE_RECTANGLE in the framebuffer constructor

https://github.com/elect86/Joglus/blob/master/Joglolus/src/joglus/example1/FrameBuffer.java

In binding the texture, function renderFullScreenQuad, line 372

https://github.com/elect86/Joglus/blob/master/Joglolus/src/joglus/example1/GlViewer.java

And using sampler2DRect in the fragment shader

https://github.com/elect86/Joglus/blob/master/Joglolus/src/joglus/example1/glsl/shaders/Distortion_FS.glsl

But if I change all the RECTANGLE to 2D and I use sample2D in the fs, I get a total black image at the end of the display(), although the dump of the texture shows always the correct image...

I would like to know why