gallium: replace prim pipeline begin/end() functions with flush()

This is basically half of Keith's draw/flush patch.

The stage->point/line/tri() functions are now self-validating, the validator
functions are installed by the flush() function.

There were excessive calls to validate_pipeline(), however.  This was caused
by draw_prim_queue_flush() keeping a local 'first' variable that always pointed
to the validate functions.  Replaced 'first' with 'draw->pipeline.first'.

Performance in gears is up just slightly with this patch.

1 files changed, 51 insertions, 48 deletions

diff --git a/src/mesa/pipe/draw/draw_twoside.c b/src/mesa/pipe/draw/draw_twoside.c
index 75c51ec6a9..ad2aaf10bb 100644
--- a/src/mesa/pipe/draw/draw_twoside.c
+++ b/src/mesa/pipe/draw/draw_twoside.c
@@ -48,48 +48,6 @@ static INLINE struct twoside_stage *twoside_stage( struct draw_stage *stage )
 }
 
 
-static void twoside_begin( struct draw_stage *stage )
-{
-   struct twoside_stage *twoside = twoside_stage(stage);
-   const struct pipe_shader_state *vs = stage->draw->vertex_shader->state;
-   uint i;
-
-   twoside->attrib_front0 = 0;
-   twoside->attrib_front1 = 0;
-   twoside->attrib_back0 = 0;
-   twoside->attrib_back1 = 0;
-
-   /* Find which vertex shader outputs are front/back colors */
-   for (i = 0; i < vs->num_outputs; i++) {
-      if (vs->output_semantic_name[i] == TGSI_SEMANTIC_COLOR) {
-         if (vs->output_semantic_index[i] == 0)
-            twoside->attrib_front0 = i;
-         else
-            twoside->attrib_front1 = i;
-      }
-      if (vs->output_semantic_name[i] == TGSI_SEMANTIC_BCOLOR) {
-         if (vs->output_semantic_index[i] == 0)
-            twoside->attrib_back0 = i;
-         else
-            twoside->attrib_back1 = i;
-      }
-   }
-
-   if (!twoside->attrib_back0)
-      twoside->attrib_front0 = 0;
-
-   if (!twoside->attrib_back1)
-      twoside->attrib_front1 = 0;
-
-   /*
-    * We'll multiply the primitive's determinant by this sign to determine
-    * if the triangle is back-facing (negative).
-    * sign = -1 for CCW, +1 for CW
-    */
-   twoside->sign = (stage->draw->rasterizer->front_winding == PIPE_WINDING_CCW) ? -1.0f : 1.0f;
-
-   stage->next->begin( stage->next );
-}
 
 
 /**
@@ -157,10 +115,56 @@ static void twoside_point( struct draw_stage *stage,
 }
 
 
-static void twoside_end( struct draw_stage *stage )
+static void twoside_first_tri( struct draw_stage *stage, 
+			       struct prim_header *header )
 {
-   /* pass-through */
-   stage->next->end( stage->next );
+   struct twoside_stage *twoside = twoside_stage(stage);
+   const struct pipe_shader_state *vs = stage->draw->vertex_shader->state;
+   uint i;
+
+   twoside->attrib_front0 = 0;
+   twoside->attrib_front1 = 0;
+   twoside->attrib_back0 = 0;
+   twoside->attrib_back1 = 0;
+
+   /* Find which vertex shader outputs are front/back colors */
+   for (i = 0; i < vs->num_outputs; i++) {
+      if (vs->output_semantic_name[i] == TGSI_SEMANTIC_COLOR) {
+         if (vs->output_semantic_index[i] == 0)
+            twoside->attrib_front0 = i;
+         else
+            twoside->attrib_front1 = i;
+      }
+      if (vs->output_semantic_name[i] == TGSI_SEMANTIC_BCOLOR) {
+         if (vs->output_semantic_index[i] == 0)
+            twoside->attrib_back0 = i;
+         else
+            twoside->attrib_back1 = i;
+      }
+   }
+
+   if (!twoside->attrib_back0)
+      twoside->attrib_front0 = 0;
+
+   if (!twoside->attrib_back1)
+      twoside->attrib_front1 = 0;
+
+   /*
+    * We'll multiply the primitive's determinant by this sign to determine
+    * if the triangle is back-facing (negative).
+    * sign = -1 for CCW, +1 for CW
+    */
+   twoside->sign = (stage->draw->rasterizer->front_winding == PIPE_WINDING_CCW) ? -1.0f : 1.0f;
+
+   stage->tri = twoside_tri;
+   stage->tri( stage, header );
+}
+
+
+static void twoside_flush( struct draw_stage *stage, unsigned flags )
+{
+   stage->tri = twoside_first_tri;
+   stage->next->flush( stage->next, flags );
 }
 
 
@@ -188,11 +192,10 @@ struct draw_stage *draw_twoside_stage( struct draw_context *draw )
 
    twoside->stage.draw = draw;
    twoside->stage.next = NULL;
-   twoside->stage.begin = twoside_begin;
    twoside->stage.point = twoside_point;
    twoside->stage.line = twoside_line;
-   twoside->stage.tri = twoside_tri;
-   twoside->stage.end = twoside_end;
+   twoside->stage.tri = twoside_first_tri;
+   twoside->stage.flush = twoside_flush;
    twoside->stage.reset_stipple_counter = twoside_reset_stipple_counter;
    twoside->stage.destroy = twoside_destroy;