draw: split off all the extra functionality in the vertex shader

This will at least allow us to make the initial gains to get decent
vertex performance much more quickly & with higher confidence of getting
it right.

At some later point can look again at code-generating all the
fetch/cliptest/viewport extras in the same block as the vertex shader.
For now, just need to get some decent baseline performance.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/draw/draw_private.h b/src/gallium/auxiliary/draw/draw_private.h
index 9407217fd33..da94e697811 100644
--- a/src/gallium/auxiliary/draw/draw_private.h
+++ b/src/gallium/auxiliary/draw/draw_private.h
@@ -224,6 +224,8 @@ struct draw_context
    unsigned nr_vertex_buffers;
 
    struct pipe_vertex_element vertex_element[PIPE_MAX_ATTRIBS];
+   unsigned nr_vertex_elements;
+
    struct draw_vertex_shader *vertex_shader;
 
    boolean identity_viewport;