draw: Fix an off-by-one bug in a vsplit assertion.

When use_spoken is true, istart (the first vertex of this segment) is
replaced by i0 (the spoken vertex of the fan).  There are still icount
vertices.

Thanks to Brian Paul for spotting this.

diff --git a/src/gallium/auxiliary/draw/draw_pt_vsplit_tmp.h b/src/gallium/auxiliary/draw/draw_pt_vsplit_tmp.h
index 3f66f96..75dba8c 100644 (file)
--- a/src/gallium/auxiliary/draw/draw_pt_vsplit_tmp.h
+++ b/src/gallium/auxiliary/draw/draw_pt_vsplit_tmp.h
@@ -258,9 +258,10 @@ vsplit_segment_fan_linear(struct vsplit_frontend *vsplit, unsigned flags,
    boolean use_spoken = ((flags & DRAW_SPLIT_BEFORE) != 0);
    unsigned nr = 0, i;
 
-   assert(icount + !!use_spoken <= vsplit->segment_size);
+   assert(icount <= vsplit->segment_size);
 
    if (use_spoken) {
+      /* replace istart by i0 */
       vsplit->fetch_elts[nr++] = i0;
       for (i = 1 ; i < icount; i++)
          vsplit->fetch_elts[nr++] = istart + i;