util/indices: implement unfilled (tri->line) conversion for adjacency prims

Tested with new piglit gl-3.2-adj-prims test.

v2: re-order trisadj and tristripadj code, per Roland.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>

2 files changed, 38 insertions, 2 deletions

diff --git a/src/gallium/auxiliary/indices/u_unfilled_gen.py b/src/gallium/auxiliary/indices/u_unfilled_gen.py
index 873e781..6b02627 100644
--- a/src/gallium/auxiliary/indices/u_unfilled_gen.py
+++ b/src/gallium/auxiliary/indices/u_unfilled_gen.py
@@ -35,14 +35,18 @@ PRIMS=('tris',
        'tristrip', 
        'quads', 
        'quadstrip', 
-       'polygon')
+       'polygon',
+       'trisadj',
+       'tristripadj')
 
 LONGPRIMS=('PIPE_PRIM_TRIANGLES', 
            'PIPE_PRIM_TRIANGLE_FAN', 
            'PIPE_PRIM_TRIANGLE_STRIP', 
            'PIPE_PRIM_QUADS', 
            'PIPE_PRIM_QUAD_STRIP', 
-           'PIPE_PRIM_POLYGON')
+           'PIPE_PRIM_POLYGON',
+           'PIPE_PRIM_TRIANGLES_ADJACENCY',
+           'PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY')
 
 longprim = dict(zip(PRIMS, LONGPRIMS))
 intype_idx = dict(ubyte='IN_UBYTE', ushort='IN_USHORT', uint='IN_UINT')
@@ -194,6 +198,22 @@ def quadstrip(intype, outtype):
     postamble()
 
 
+def trisadj(intype, outtype):
+    preamble(intype, outtype, prim='trisadj')
+    print '  for (i = start, j = 0; j < out_nr; j+=6, i+=6) { '
+    do_tri( intype, outtype, 'out+j',  'i', 'i+2', 'i+4' );
+    print '   }'
+    postamble()
+
+
+def tristripadj(intype, outtype):
+    preamble(intype, outtype, prim='tristripadj')
+    print '  for (i = start, j = 0; j < out_nr; j+=6, i+=2) { '
+    do_tri( intype, outtype, 'out+j',  'i', 'i+2', 'i+4' );
+    print '   }'
+    postamble()
+
+
 def emit_funcs():
     for intype in INTYPES:
         for outtype in OUTTYPES:
@@ -203,6 +223,8 @@ def emit_funcs():
             quads(intype, outtype)
             quadstrip(intype, outtype)
             polygon(intype, outtype)
+            trisadj(intype, outtype)
+            tristripadj(intype, outtype)
 
 def init(intype, outtype, prim):
     if intype == GENERATE:
diff --git a/src/gallium/auxiliary/indices/u_unfilled_indices.c b/src/gallium/auxiliary/indices/u_unfilled_indices.c
index 49fff6b..8cb5192 100644
--- a/src/gallium/auxiliary/indices/u_unfilled_indices.c
+++ b/src/gallium/auxiliary/indices/u_unfilled_indices.c
@@ -22,6 +22,12 @@
  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
+
+/*
+ * NOTE: This file is not compiled by itself.  It's actually #included
+ * by the generated u_unfilled_gen.c file!
+ */
+
 #include "u_indices.h"
 #include "u_indices_priv.h"
 #include "util/u_prim.h"
@@ -104,6 +110,14 @@ nr_lines(unsigned prim, unsigned nr)
       return (nr - 2) / 2 * 8;
    case PIPE_PRIM_POLYGON:
       return 2 * nr; /* a line (two verts) for each polygon edge */
+   /* Note: these cases can't really be handled since drawing lines instead
+    * of triangles would also require changing the GS.  But if there's no GS,
+    * this should work.
+    */
+   case PIPE_PRIM_TRIANGLES_ADJACENCY:
+      return (nr / 6) * 6;
+   case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
+      return ((nr - 4) / 2) * 6;
    default:
       assert(0);
       return 0;