On 12/14/2011 11:59 AM, Paul Berry wrote: > This patch enables rasterizer discard functionality (a part of > transform feedback) in Gen6, by generating an alternate GS program > when rasterizer discard is active. Instead of forwarding vertices > down the pipeline, the alternate GS program uses a URB Write message > to deallocate the URB entry that was allocated by FF sync and > terminate the thread. > > Note: parts of the Sandy Bridge PRM seem to imply that we could do > this more efficiently, by clearing the GEN6_GS_RENDERING_ENABLE bit, > and not allocating a URB entry at all. However, it's not clear how we > are supposed to terminate the thread if we do that. Volume 2 part 1, > section 4.5.4, says "GS threads must terminate by sending a URB_WRITE > message with the EOT and Complete bits set.", and my experiments so > far confirm that. > --- > > This patch needs to be applied on top of the series "[PATCH 0/8] i965 > gen6: Initial implementation of transform feedback.", which is still > under review on the mailing list.
Assuming the dirty bit gets sorted out, Reviewed-by: Kenneth Graunke <kenn...@whitecape.org> _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
