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, 4 insertions, 4 deletions

diff --git a/src/gallium/auxiliary/draw/draw_pt_varray.c b/src/gallium/auxiliary/draw/draw_pt_varray.c
index 5ea833032f..d89d5cd20f 100644
--- a/src/gallium/auxiliary/draw/draw_pt_varray.c
+++ b/src/gallium/auxiliary/draw/draw_pt_varray.c
@@ -137,7 +137,6 @@ static unsigned decompose_prim[PIPE_PRIM_POLYGON + 1] = {
 
 static void varray_prepare(struct draw_pt_front_end *frontend,
                            unsigned in_prim,
-                           unsigned out_prim,
                            struct draw_pt_middle_end *middle,
                            unsigned opt)
 {
@@ -146,11 +145,12 @@ static void varray_prepare(struct draw_pt_front_end *frontend,
    varray->base.run = varray_run;
 
    varray->input_prim = in_prim;
-   varray->output_prim = decompose_prim[out_prim];
+   varray->output_prim = decompose_prim[in_prim];
 
    varray->middle = middle;
-   middle->prepare(middle, varray->input_prim,
-                   varray->output_prim, opt, &varray->driver_fetch_max );
+   middle->prepare(middle,
+                   varray->output_prim,
+                   opt, &varray->driver_fetch_max );
 
    /* check that the max is even */
    assert((varray->driver_fetch_max & 1) == 0);