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Getting GPU texture data to CPU

OpenGL

Started by all_names_taken Mar 8, 2008 at 3:12 AM 2 replies 700+ views

Original Post

all_names_taken

110

all_names_taken

Mar 8, 2008 at 3:12 AM

I'm using glTexSubImage2D a lot to update a texture in a component. For testing purposes, it would be quite handy to be able to retrieve the texture data from the GPU to perform checks at any time that the data loaded into it is correct. Is there any way of doing this in OpenGL?

Trenki

Mar 8, 2008 at 3:23 AM

Take a look at the OpenGL reference pages.
Unfortunately it seems you can only retrieve the whole texture and not just a part of it. A workaround would be to render the texture to the framebuffer or bind it to a framebuffer object, set the read buffer correctly and then read it with glReadPixels.

all_names_taken

Author

110

all_names_taken

Mar 8, 2008 at 7:42 AM

Thank you, I think retrieving the entire texture will work well for my application!

V-man

163

V-man

Mar 10, 2008 at 9:19 PM

It better to use GLintercept for debugging. If you have any questions on how to use, ask away.

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