Hey, this is relatively simple: Mesa GPU instructions had no way of representing 2D register arrays which was especially painful for things like geometry shaders. It's the same thing Gallium supported for a while meaning INPUT[index1][index2] syntax. So for example gl_PositionIn[index] becomes INPUT[index][gl_PositionIn], so the first index is the index within the array and the second identifies the semantic of the array.
This merge finally brings working ARB_geometry_shader4 to Mesa3D! For drivers that use Gallium3D the change means absolutely nothing (of course besides the fact that if the driver had implemented Gallium's geometry shader interface then it gets ARB_geometry_shader4 support for free). There's a nice example called bezier in demos/src/glsl/bezier.c that uses geometry shaders to render a bezier curve. Oh, and also both llvmpipe and softpipe drivers support geometry shaders. z _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
