Author Topic: Post Effects question (Read 2601 times)

Zamadatix · « **on:** November 21, 2010, 12:50:02 am »

Is it possible to have a post effect return a variable (other than pixel data) back to the program directly?

Spodi · « **Reply #1 on:** November 21, 2010, 05:00:09 am »

Generally, if you want to grab values out from the GPU and bring it back into system memory, you will want to write it to a texture. Basically just like drawing, but the generated image isn't for the purpose of displaying.

Zamadatix · « **Reply #2 on:** November 21, 2010, 03:58:46 pm »

So the simplest/fastest way I can do this is to pass 4 floats per pixel (vec4's) of a texture and use sfml to read the pixel data of the texture?

Spodi · « **Reply #3 on:** November 21, 2010, 09:03:13 pm »

This might be a good resource to read for the basics on GPGPU:

http://www.mathematik.uni-dortmund.de/~goeddeke/gpgpu/tutorial.html