geometry shaders: make gs work with changable primitives and variable number of vertices

lots and lots of fixes for geometry shaders. in particular now we work when the gs
emits a different primitive than the one the pipeline was started with and also
we work when gs emits more vertices than would fit in the original buffer.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/gallium/auxiliary/draw/draw_pt.h b/src/gallium/auxiliary/draw/draw_pt.h
index b9032468da3..67ae70fdaf7 100644
--- a/src/gallium/auxiliary/draw/draw_pt.h
+++ b/src/gallium/auxiliary/draw/draw_pt.h
@@ -60,7 +60,8 @@ struct draw_context;
  */
 struct draw_pt_front_end {
    void (*prepare)( struct draw_pt_front_end *,
-                    unsigned prim,
+                    unsigned input_prim,
+                    unsigned output_prim,
                     struct draw_pt_middle_end *,
 		    unsigned opt );
 
@@ -84,7 +85,8 @@ struct draw_pt_front_end {
  */
 struct draw_pt_middle_end {
    void (*prepare)( struct draw_pt_middle_end *,
-                    unsigned prim,
+                    unsigned input_prim,
+                    unsigned output_prim,
 		    unsigned opt,
                     unsigned *max_vertices );