etnaviv: kmscube

Fri, 25 Sep 2015 21:39:10 +0000

Last Friday I got kmscube successfully running with mesa and the new etnaviv DRM kernel driver. At this time I got it not really pixel perfect and I spend some nights to get it fixed. It turns out that I need a small mesa hack to get the rendering correct.

You may ask why did it so long to get it working? Let me explain it to you.

The Vivnate GPU is a so called render-only GPU which does not have any kind of scanout logic in it. It can only render to physical memory and this only in a tiled memory layout. So we need to use the resolve engine found on the GPU to de-tile the rendered image and blit it to the dumb buffer. Currently mesa has no software support for this kind of hardware, but I think that could change soon.

Render-Only on Christian Gmeiner

etnaviv: kmscube