diff -Naur a/src/gallium/drivers/r300/r300_render.c b/src/gallium/drivers/r300/r300_render.c
--- a/src/gallium/drivers/r300/r300_render.c	2013-07-03 19:48:15.000000000 +0200
+++ b/src/gallium/drivers/r300/r300_render.c	2013-07-03 20:28:30.000000000 +0200
@@ -1018,7 +1018,7 @@
     if (!r300_prepare_for_rendering(r300,
                                     PREP_EMIT_STATES |
                                     PREP_EMIT_VARRAYS_SWTCL | PREP_INDEXED,
-                                    NULL, 256, 0, 0, -1)) {
+                                    NULL, 6 + (count + 1) / 2 , 0, 0, -1)) {
         return;
     }
 
@@ -1053,7 +1053,7 @@
         if (count) {
             if (!r300_prepare_for_rendering(r300,
                     PREP_EMIT_VARRAYS_SWTCL | PREP_INDEXED,
-                    NULL, 256, 0, 0, -1))
+                    NULL, 6 + (count + 1) / 2, 0, 0, -1))
                 return;
 
             end_cs_dwords = r300_get_num_cs_end_dwords(r300);