gallium: plug in vertex passthrough code

Based on a patch from Zack.
Basically, implement a new draw_arrays function that copies the incoming
user-vertices to the hardware vertex buffer, doing format/type conversion
as needed.
The vertex fetch/store code is totally temporary for now.

1 files changed, 45 insertions, 2 deletions

diff --git a/src/gallium/auxiliary/draw/draw_prim.c b/src/gallium/auxiliary/draw/draw_prim.c
index 7d6cd43410..ff71ba9b73 100644
--- a/src/gallium/auxiliary/draw/draw_prim.c
+++ b/src/gallium/auxiliary/draw/draw_prim.c
@@ -31,6 +31,7 @@
   */
 
 #include "pipe/p_debug.h"
+#include "pipe/p_util.h"
 
 #include "draw_private.h"
 #include "draw_context.h"
@@ -118,7 +119,42 @@ static void draw_prim_queue_flush( struct draw_context *draw )
    draw_vertex_cache_unreference( draw );
 }
 
+static INLINE void fetch_and_store(struct draw_context *draw)
+{
+   unsigned i;
+
+   /* run vertex shader on vertex cache entries, four per invokation */
+#if 0
+   {
+      const struct vertex_info *vinfo = draw->render->get_vertex_info(draw->render);
+      memcpy(draw->vs.queue[0].vertex, draw->vs.queue[i + j].elt,
+             count * vinfo->size);
+   }
+#elif 0
+   draw_update_vertex_fetch(draw);
+   for (i = 0; i < draw->vs.queue_nr; i += 4) {
+      struct vertex_header *dests[4];
+      unsigned elts[4];
+      struct tgsi_exec_machine *machine = &draw->machine;
+      int j, n = MIN2(4, draw->vs.queue_nr - i);
+
+      for (j = 0; j < n; j++) {
+         elts[j] = draw->vs.queue[i + j].elt;
+         dests[j] = draw->vs.queue[i + j].vertex;
+      }
 
+      for ( ; j < 4; j++) {
+	 elts[j] = elts[0];
+         dests[j] = draw->vs.queue[i + j].vertex;
+      }
+      //fetch directly into dests
+      draw->vertex_fetch.fetch_func(draw, machine, dests, count);
+   }
+#endif
+
+   draw->vs.post_nr = draw->vs.queue_nr;
+   draw->vs.queue_nr = 0;
+}
 
 void draw_do_flush( struct draw_context *draw, unsigned flags )
 {
@@ -134,7 +170,10 @@ void draw_do_flush( struct draw_context *draw, unsigned flags )
 
    if (flags >= DRAW_FLUSH_SHADER_QUEUE) {
       if (draw->vs.queue_nr)
-         (*draw->shader_queue_flush)(draw);
+         if (draw->rasterizer->bypass_vs)
+            fetch_and_store(draw);
+         else
+            (*draw->shader_queue_flush)(draw);
 
       if (flags >= DRAW_FLUSH_PRIM_QUEUE) {
 	 if (draw->pq.queue_nr)
@@ -485,7 +524,11 @@ draw_arrays(struct draw_context *draw, unsigned prim,
    }
 
    /* drawing done here: */
-   draw_prim(draw, prim, start, count);
+   if (!draw->rasterizer->bypass_vs ||
+       !draw_passthrough_arrays(draw, prim, start, count)) {
+      /* we have to run the whole pipeline */
+      draw_prim(draw, prim, start, count);
+   }
 }