On Fri, Aug 6, 2010 at 6:03 PM, Henri Verbeet <hverb...@gmail.com> wrote: > On 5 August 2010 18:51, Chia-I Wu <olva...@gmail.com> wrote: >> The GL rule is last vertex last for each primitive. The D3D rule is first >> vertex first. My idea is to have draw_decompose_tmp.h use a local variable, >> last_vertex_last, to select the rules. In draw_gs_tmp.h and >> draw_so_emit_tmp.h, last_vertex_last is TRUE when the new settable flags is >> TRUE. However, in draw_pt_decompse.h, where the rules no longer matter, >> last_vertex_last is set to !(flatshade && flatshade_first). > Doesn't ARB_provoking_vertex control that for GL? The decomposers are using the provoking convention to decide the decomposition rule. That is, tri_strip [0, 1, 2, 3] is decomposed to
tri [0, 1, 2] and [2, 1, 3], when GL_LAST_VERTEX_CONVENTION tri [0, 1, 2] and [1, 3, 2], when GL_FIRST_VERTEX_CONVENTION That is fine when GS is not active. But when GS is active, and when the second triangle is processed, gl_PositionIn[0] could be vertex 2 or vertex 1 depending on the convention. Now that is not desirable. The decomposers should not depend on the provoking convention to decide how to decompose, at least for those decomposers before GS. -- o...@lunarg.com _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev