draw/so: maintain an exact number of written vertices

It's quite helpful during the rendering when we know
exactly the count of the vertices available in the
buffer.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: José Fonseca <jfonseca@vmware.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/draw/draw_context.h b/src/gallium/auxiliary/draw/draw_context.h
index 369f6c80fa..b333457775 100644
--- a/src/gallium/auxiliary/draw/draw_context.h
+++ b/src/gallium/auxiliary/draw/draw_context.h
@@ -60,6 +60,7 @@ struct draw_so_target {
    struct pipe_stream_output_target target;
    void *mapping;
    int internal_offset;
+   int emitted_vertices;
 };
 
 struct draw_context *draw_create( struct pipe_context *pipe );