I see. Ultimately I will end up rendering the original texture onto a new texture, and then read the pixels from the new texture. This will sidestep the issue (since I will never render using the...

Sorry, I am not completely sure what you mean by this.

Hmm, I'm still thinking about this answer--it doesn't quite match up with what I'm doing, but maybe you are on to something. Just to be clear, I'm never rendering to a texture which is attached to...

Thanks for the suggestion; I did try gl.glReadBuffer(GL2.GL_NONE) before and/or after the "detach texture" line. It has no observable effect.

Also, I tried running this project in Windows 7 (with...

Some context: I have a project which creates thumbnails of textures when they are loaded to be used in the GUI. This is achieved by attaching the texture to a framebuffer and using glReadPixels. ...

That makes sense, I suspected that was the case but it's good to know for sure. Thanks for the help!

Whoops, I guess I should have checked if it was a link error or validation error! You nailed it exactly... I rewrote all the error checks more carefully, separating the link and validation checks,...

Ok, just to be really complete, here are more glGetStrings:

GL_SHADING_LANGUAGE_VERSION: 4.20

GL_EXTENSIONS: GL_AMDX_debug_output GL_AMDX_vertex_shader_tessellator GL_AMD_conservative_depth...

Here's another piece of code that might be relevant: The TEXTURE_CUBE_MAP I'm rendering to is created like this:



//create texture
int[] createTexIDs = new int[1];...

This is a little long but I want to be as clear as possible.

Here is a brief description of my problem: I am successfully rendering a simple scene using deferred shading and light maps. ...