Post-Render Image Manipulation (SDL?)

[opticdrive]

Is it possible to use SDL or Allegro to preform 2D image manipulation of the 'Screen'/window? I also want to be able do image manipulation on textures too. Is this possible, and if so how?

Thanks.

[REDDemon]

are you using irrlicht?

[hybrid]

You need to transfer the framebuffer/texture to the CPU, manipulate, and re-upload. So it's usually better to use a shader for post-processing. But else you can of course use any software to manipulate the screen this way.

[opticdrive]

are you using irrlicht?

Yes

You need to transfer the framebuffer/texture to the CPU, manipulate, and re-upload. So it's usually better to use a shader for post-processing. But else you can of course use any software to manipulate the screen this way.

How would you recommend one does the framebuffer thing? I didn't see any tutorial for this. I've already read the one that explains rendering images, which is how I am guessing the manipulated image gets rendered/reuploaded. I need to be able to do pixel (2D array) type image modification every frame.


Thanks again.

[hybrid]

In general, render target textures have the best performance for this. So have a look at example 13. Once the texture is updated, you can render it to a large quad of the desired size.