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, 5 insertions, 3 deletions

diff --git a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c
index 5483a25f1d..b8270280b6 100644
--- a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c
+++ b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c
@@ -68,8 +68,7 @@ struct fetch_shade_emit {
 
 
 static void fse_prepare( struct draw_pt_middle_end *middle,
-                         unsigned in_prim,
-                         unsigned out_prim,
+                         unsigned prim,
                          unsigned opt,
                          unsigned *max_vertices )
 {
@@ -80,9 +79,12 @@ static void fse_prepare( struct draw_pt_middle_end *middle,
    unsigned i;
    unsigned nr_vbs = 0;
 
+   /* Can't support geometry shader on this path.
+    */
+   assert(!draw->gs.geometry_shader);
 
    if (!draw->render->set_primitive( draw->render,
-                                     out_prim )) {
+                                     prim )) {
       assert(0);
       return;
    }