Hi Damien, On Thu, 2014-03-20 at 14:45 +0000, Damien Lespiau wrote: > On Thu, Mar 20, 2014 at 02:11:40PM +0000, Damien Lespiau wrote: > > (source is premultiplied) > > > > RGBA = ADD(SRC_COLOR*SRC_ALPHA, DST_COLOR*ONE_MINUS_SRC_ALPHA) > > Grr, copy/paste error. If the source is already premultiplied: > > RGBA = ADD(SRC_COLOR, DST_COLOR*ONE_MINUS_SRC_ALPHA) > 1. Currently there is no interface to advertise the DRM_FORMATS plane supportes to user mode? Should we add new IOCTL for that and include pre-multiplied alpha formats while advertising? Or am I missing any such API already available? 2. About constant alpha property - when we program constant alpha register will hardware be able to take care of the blending as per equations you have specified for non-premultiplied-alpha and premultiplied-alpha cases or we have to do any additional setting? Confusion is because of two combinations: a. pre-multiplied alpha+constant alpha b. non-pre-multiplied alpha+constant alpha Kindly clarify. thanks, Sagar _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
