draw: don't try to precalculate the pipeline output primitive

We were previously calculating a value which was either the geometry
shader output primitive or the application's input primitive, and
passing that to the various front/middle/back components for use as
the ultimate rendering primtive.

Unfortunately, this was not correct -- if the vcache decomposition
path is active and geometry shaders are *not* active, we can end up
with a third primitive -- specifically the decomposed version of the
input primitive.

Rather than trying to precalculate this, just let the individual
components inform their successors about which primitive type they are
recieving.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/gallium/auxiliary/draw/draw_pt_fetch_emit.c b/src/gallium/auxiliary/draw/draw_pt_fetch_emit.c
index c629d55563..5c8af17c8e 100644
--- a/src/gallium/auxiliary/draw/draw_pt_fetch_emit.c
+++ b/src/gallium/auxiliary/draw/draw_pt_fetch_emit.c
@@ -36,6 +36,7 @@
 #include "draw/draw_vbuf.h"
 #include "draw/draw_vertex.h"
 #include "draw/draw_pt.h"
+#include "draw/draw_gs.h"
 #include "translate/translate.h"
 #include "translate/translate_cache.h"
 
@@ -90,7 +91,6 @@ struct fetch_emit_middle_end {
 
 static void fetch_emit_prepare( struct draw_pt_middle_end *middle,
                                 unsigned prim,
-                                unsigned out_prim,
 				unsigned opt,
                                 unsigned *max_vertices )
 {
@@ -101,9 +101,14 @@ static void fetch_emit_prepare( struct draw_pt_middle_end *middle,
    boolean ok;
    struct translate_key key;
 
+   unsigned gs_out_prim = (draw->gs.geometry_shader ? 
+                           draw->gs.geometry_shader->output_primitive :
+                           prim);
+
+
 
    ok = draw->render->set_primitive( draw->render, 
-                                     out_prim );
+                                     gs_out_prim );
    if (!ok) {
       assert(0);
       return;