i965: Convert VUE map generation checks to if rather than switch.

There are currently only two VUE map layouts: one for Gen4-5, and one
for everything else.  We keep having to add new "case N+1" labels for
every new hardware generation, and so far it's always been the same.

This patch makes it so we only have to do work in the case where
something actually changes.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>

diff --git a/src/mesa/drivers/dri/i965/brw_vs.c b/src/mesa/drivers/dri/i965/brw_vs.c
index 775901f56b0ee153786c0583714ab1f7fa5d2d03..d3dbc8eef719879d93a9833dc56fde6e8a628334 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_vs.c
+++ b/src/mesa/drivers/dri/i965/brw_vs.c
@@ -82,9 +82,7 @@ brw_compute_vue_map(struct brw_context *brw, struct brw_vue_map *vue_map,
    /* VUE header: format depends on chip generation and whether clipping is
     * enabled.
     */
-   switch (brw->gen) {
-   case 4:
-   case 5:
+   if (brw->gen < 6) {
       /* There are 8 dwords in VUE header pre-Ironlake:
        * dword 0-3 is indices, point width, clip flags.
        * dword 4-7 is ndc position
@@ -96,10 +94,7 @@ brw_compute_vue_map(struct brw_context *brw, struct brw_vue_map *vue_map,
       assign_vue_slot(vue_map, VARYING_SLOT_PSIZ);
       assign_vue_slot(vue_map, BRW_VARYING_SLOT_NDC);
       assign_vue_slot(vue_map, VARYING_SLOT_POS);
-      break;
-   case 6:
-   case 7:
-   case 8:
+   } else {
       /* There are 8 or 16 DWs (D0-D15) in VUE header on Sandybridge:
        * dword 0-3 of the header is indices, point width, clip flags.
        * dword 4-7 is the 4D space position
@@ -126,10 +121,6 @@ brw_compute_vue_map(struct brw_context *brw, struct brw_vue_map *vue_map,
          assign_vue_slot(vue_map, VARYING_SLOT_COL1);
       if (slots_valid & BITFIELD64_BIT(VARYING_SLOT_BFC1))
          assign_vue_slot(vue_map, VARYING_SLOT_BFC1);
-      break;
-   default:
-      assert (!"VUE map not known for this chip generation");
-      break;
    }
 
    /* The hardware doesn't care about the rest of the vertex outputs, so just