swr: fix polygonmode for front==back

Rasterizer core only supports polygonmode front==back.  Add logic for
populating fillMode for the rasterizer only for that case correctly.
Provide enum conversion between mesa enums and core enums.

The core renders lines/points as tris. Previously, code would enable
stipple for polygonmode != FILL.  Modify stipple enable logic so that
this works correctly.

No regressions in vtk tests.
Fixes the following piglit tests:
	pointsprite
	gl-1.0-edgeflag-const

v2: remove cc stable, and remove "not implemented" assert
v3: modified commit message

Reviewed-by: Bruce Cherniak <[email protected]>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/gallium/drivers/swr/swr_state.h b/src/gallium/drivers/swr/swr_state.h
index 9a8c4e1311c..7940a960d93 100644
--- a/src/gallium/drivers/swr/swr_state.h
+++ b/src/gallium/drivers/swr/swr_state.h
@@ -376,4 +376,24 @@ swr_convert_prim_topology(const unsigned mode)
       return TOP_UNKNOWN;
    }
 };
+
+/*
+ * convert mesa PIPE_POLYGON_MODE_X to SWR enum SWR_FILLMODE
+ */
+static INLINE enum SWR_FILLMODE
+swr_convert_fill_mode(const unsigned mode)
+{
+   switch(mode) {
+   case PIPE_POLYGON_MODE_FILL:
+      return SWR_FILLMODE_SOLID;
+   case PIPE_POLYGON_MODE_LINE:
+      return SWR_FILLMODE_WIREFRAME;
+   case PIPE_POLYGON_MODE_POINT:
+      return SWR_FILLMODE_POINT;
+   default:
+      assert(0 && "Unknown fillmode");
+      return SWR_FILLMODE_SOLID; // at least do something sensible
+   }
+}
+
 #endif