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.

3 files changed, 41 insertions, 15 deletions

diff --git a/src/mesa/pipe/softpipe/sp_draw_arrays.c b/src/mesa/pipe/softpipe/sp_draw_arrays.c
index 423c91d4b8..71a303a8b5 100644
--- a/src/mesa/pipe/softpipe/sp_draw_arrays.c
+++ b/src/mesa/pipe/softpipe/sp_draw_arrays.c
@@ -142,21 +142,18 @@ softpipe_draw_elements(struct pipe_context *pipe,
    /* draw! */
    draw_arrays(draw, mode, start, count);
 
-   /* always flush for now */
-   draw_flush(draw);
-
    /*
-    * unmap vertex/index buffers
+    * unmap vertex/index buffers - will cause draw module to flush
     */
    for (i = 0; i < PIPE_ATTRIB_MAX; i++) {
       if (sp->vertex_buffer[i].buffer) {
-         pipe->winsys->buffer_unmap(pipe->winsys, sp->vertex_buffer[i].buffer);
          draw_set_mapped_vertex_buffer(draw, i, NULL);
+         pipe->winsys->buffer_unmap(pipe->winsys, sp->vertex_buffer[i].buffer);
       }
    }
    if (indexBuffer) {
-      pipe->winsys->buffer_unmap(pipe->winsys, indexBuffer);
       draw_set_mapped_element_buffer(draw, 0, NULL);
+      pipe->winsys->buffer_unmap(pipe->winsys, indexBuffer);
    }
 
 
diff --git a/src/mesa/pipe/softpipe/sp_prim_setup.c b/src/mesa/pipe/softpipe/sp_prim_setup.c
index 478ecff2fb..088d8a4c07 100644
--- a/src/mesa/pipe/softpipe/sp_prim_setup.c
+++ b/src/mesa/pipe/softpipe/sp_prim_setup.c
@@ -1170,11 +1170,43 @@ static void setup_begin( struct draw_stage *stage )
    setup->quad.nr_attrs = fs->num_inputs;
 
    sp->quad.first->begin(sp->quad.first);
+
+   stage->point = setup_point;
+   stage->line = setup_line;
+   stage->tri = setup_tri;
 }
 
 
-static void setup_end( struct draw_stage *stage )
+static void setup_first_point( struct draw_stage *stage,
+			       struct prim_header *header )
+{
+   setup_begin(stage);
+   stage->point( stage, header );
+}
+
+static void setup_first_line( struct draw_stage *stage,
+			       struct prim_header *header )
+{
+   setup_begin(stage);
+   stage->line( stage, header );
+}
+
+
+static void setup_first_tri( struct draw_stage *stage,
+			       struct prim_header *header )
+{
+   setup_begin(stage);
+   stage->tri( stage, header );
+}
+
+
+
+static void setup_flush( struct draw_stage *stage,
+			 unsigned flags )
 {
+   stage->point = setup_first_point;
+   stage->line = setup_first_line;
+   stage->tri = setup_first_tri;
 }
 
 
@@ -1198,11 +1230,10 @@ struct draw_stage *sp_draw_render_stage( struct softpipe_context *softpipe )
 
    setup->softpipe = softpipe;
    setup->stage.draw = softpipe->draw;
-   setup->stage.begin = setup_begin;
-   setup->stage.point = setup_point;
-   setup->stage.line = setup_line;
-   setup->stage.tri = setup_tri;
-   setup->stage.end = setup_end;
+   setup->stage.point = setup_first_point;
+   setup->stage.line = setup_first_line;
+   setup->stage.tri = setup_first_tri;
+   setup->stage.flush = setup_flush;
    setup->stage.reset_stipple_counter = reset_stipple_counter;
    setup->stage.destroy = render_destroy;
 
diff --git a/src/mesa/pipe/softpipe/sp_prim_vbuf.c b/src/mesa/pipe/softpipe/sp_prim_vbuf.c
index dfabae8302..c9089e7eb2 100644
--- a/src/mesa/pipe/softpipe/sp_prim_vbuf.c
+++ b/src/mesa/pipe/softpipe/sp_prim_vbuf.c
@@ -149,8 +149,6 @@ sp_vbuf_draw(struct vbuf_render *vbr, const ushort *indices, uint nr_indices)
    prim.edgeflags = 0;
    prim.pad = 0;
 
-   setup->begin( setup );
-
    switch (cvbr->prim) {
    case PIPE_PRIM_TRIANGLES:
       for (i = 0; i < nr_indices; i += 3) {
@@ -182,7 +180,7 @@ sp_vbuf_draw(struct vbuf_render *vbr, const ushort *indices, uint nr_indices)
       break;
    }
 
-   setup->end( setup );
+   setup->flush( setup, 0 );
 }