Do OpenGL matrix process functions have hardware matrix transform?

Graphics and GPU Programming Programming OpenGL

Started by savedbygamesandcodes June 08, 2006 01:23 AM

1 comment, last by Sneftel 17 years, 10 months ago

136

Author

June 08, 2006 01:23 AM

Do OpenGL matrix process functions (such as glRotate) have hardware matrix transform? If it do, how many hardware support it? Thanks in advance.

Demus79

362

June 08, 2006 01:39 AM

As far as I know, most of the HW will do these operations on CPU. I'd like to hear if there is any implementation which actually uses some sort of special HW for this.

This isn't the first time I hear this question / assertion. Could somebody enlighten me and tell where it comes from.

Best regards

Sneftel

1,788

June 08, 2006 02:28 AM

There would be no benefit to doing matrix stack multiplications on the GPU. The CPU has better single-threaded floating-point performance (which is what is needed) than the GPU does, and doing it on the GPU would increase the amount of data which would need to be transfered back and forth.