View Full Version : glCopyTexImage2D Problem -> Texture to copy bigger than frame buffer

Kilam Malik
03-12-2002, 08:18 AM
I'm copying the content of the frame buffer to a texture. But when the size of my window is getting smaller then the texture I want to capture, then I get only the size of the frame buffer captures. But I set the glViewport to my texture size. Is there any possibility to work around this.

If not, then I maybe have to adjust the size of the captures texture to the size of the framebuffer.
Or maybe open a second render context to render the texture...


03-12-2002, 08:40 AM
Yes, those are the two alternatives.

Also beware that when you're NOT in full-screen mode, the framebuffer for any part of your window that is hidden behind other windows contains undefined bits (which may or may not be the bits you want).

03-12-2002, 10:39 AM
Couldn't you just make the texture smaller with the window? The texture resolution wouldn't be what you might want, but you wouldn't need to setup another context (for a P-Buffer) and render twice.

03-12-2002, 11:53 AM
I suggest you take a look at WGL_ARB_render_texture.

Kilam Malik
03-12-2002, 11:03 PM
Thanks for you replies!

As I want to run my program in software mode too, I think I cant use the WGL_ARB_RENDER_TEXTURE extension.

So I will resize the texture.