On Fri, Jan 10, 2014 at 10:33 AM, Lauri Kasanen <c...@gmx.com> wrote: > On Fri, 10 Jan 2014 03:57:45 +0100 > srol...@vmware.com wrote: > >> From: Roland Scheidegger <srol...@vmware.com> >> >> OpenGL does whole-point clipping, that is a large point is either fully >> clipped or fully unclipped (the latter means it may extend beyond the >> viewport as long as the center is inside the viewport). d3d9 (d3d10 has >> no large points) however requires points to be clipped after they are >> expanded to a rectangle. (Note some IHVs are known to ignore GL rules at >> least with some hw/drivers.) >> >> Hence add a rasterizer bit indicating which way points should be clipped >> (some drivers probably will always ignore this), and add the draw interaction >> this requires. Drivers wanting to support this and using draw must support >> large points on their own as draw doesn't implement vp clipping on the >> expanded points (it potentially could but the complexity doesn't seem >> warranted), and the driver needs to do viewport scissoring on such points. > > Is there any possibility of this being exposed to user-space? With that > hat on, it would have been useful to me several times in the past. > > Perhaps whoever was Mesa's ARB contact could propose an extension? I > know nothing about how that happens, just would like this functionality.
IIRC there were some draft by NVIDIA discussed in Khronos OpenGL ES meetings 6-7 years ago, but I don't think it ever resulted in a released extension spec. _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
