On 11/21/2014 03:14 PM, Chris Wilson wrote: > On Thu, Nov 20, 2014 at 09:56:25AM +0100, Thomas Hellstrom wrote: >> It happens on occasion that developers of generic user-space applications >> abuse the dumb buffer API to get hold of drm buffers that they can both >> mmap() and use for GPU acceleration, using the assumptions that dumb buffers >> and buffers available for GPU are >> a) The same type and can be aribtrarily type-casted. >> b) fully coherent. > Both (a) and (b) are true for intel and it turns out to be a requirement > for smooth transitions from the boot splash screens into X, and relied > upon by userspace. > -Chris > So when you say relied upon by user-space, do you mean generic user-space or driver-specific user-space? With that, I mean what component is responsible for deciding that the dumb buffer can be accelerated? The Intel xorg driver? /Thomas _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
