limit of glsl shader output numbers how much output a shader can have

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi,

I have a question regarding the maximum output per shader language using glsl. I have impression that n in gl_FragData[n] should be less than 8, that means one can only output 32 float per shader ( not including the other float by gl_FragDepth )

Is this true?

Thanks.

Mayt

2

This forum is for CUDA questions only.

Please try posting on the registered developer forums, or OpenGL.org.

(But to answer your question - yes, the maximum is 8 on G80, 4 on G70).

3

Simon,

Thank you for your reply. I’ll post OpenGL questions in other places later.

Just curious, my understanding is that CUDA removed the limitation of 8, right? I can write much more output per thread to global memory and output them.

Thanks.

4

Yes, in CUDA you can write an arbitrary number of outputs per thread, and more interestingly you can write them to any address (scattered writes).

CUDA is much more like programming a regular CPU in this regard.

5

Thank you, Simon.