gallium: make draw auto work and add relevant caps and docs

2 files changed, 10 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/draw/draw_pt_so_emit.c b/src/gallium/auxiliary/draw/draw_pt_so_emit.c
index b982e4c529..8a065a378b 100644
--- a/src/gallium/auxiliary/draw/draw_pt_so_emit.c
+++ b/src/gallium/auxiliary/draw/draw_pt_so_emit.c
@@ -163,6 +163,8 @@ void draw_pt_so_emit( struct pt_so_emit *emit,
                          stride, ~0);
    translate->run(translate, 0, vertex_count,
                   draw->instance_id, so_buffer);
+
+   render->set_stream_output_info(render, 0, vertex_count);
 }
 
 
diff --git a/src/gallium/auxiliary/draw/draw_vbuf.h b/src/gallium/auxiliary/draw/draw_vbuf.h
index 83ae26a9c2..8d9768246e 100644
--- a/src/gallium/auxiliary/draw/draw_vbuf.h
+++ b/src/gallium/auxiliary/draw/draw_vbuf.h
@@ -117,6 +117,14 @@ struct vbuf_render {
    void (*release_vertices)( struct vbuf_render * );
 
    void (*destroy)( struct vbuf_render * );
+
+
+   /**
+    * Called after writing data to the stream out buffers
+    */
+   void (*set_stream_output_info)( struct vbuf_render *vbufr,
+                                   unsigned buffer_index,
+                                   unsigned vertices_count );
 };