draw/llvmpipe: allow independent so attachments to the vs

When geometry shaders are present, one needs to be able to create
an empty geometry shader with stream output that needs to be
resolved later and attached to the currently bound vertex shader.
Lets add support for it to llvmpipe and draw. draw allows attaching
independent stream output info to any vertex shader and llvmpipe
resolves at draw time which vertex shader the given empty geometry
shader should be linked to.

Signed-off-by: Zack Rusin <[email protected]>
Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: José Fonseca <[email protected]>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/draw/draw_vs.c b/src/gallium/auxiliary/draw/draw_vs.c
index 266cca713e1..afec3760e77 100644
--- a/src/gallium/auxiliary/draw/draw_vs.c
+++ b/src/gallium/auxiliary/draw/draw_vs.c
@@ -245,3 +245,16 @@ draw_vs_get_emit( struct draw_context *draw,
    
    return draw->vs.emit;
 }
+
+void
+draw_vs_attach_so(struct draw_vertex_shader *dvs,
+                  const struct pipe_stream_output_info *info)
+{
+   dvs->state.stream_output = *info;
+}
+
+void
+draw_vs_reset_so(struct draw_vertex_shader *dvs)
+{
+   memset(&dvs->state.stream_output, 0, sizeof(dvs->state.stream_output));
+}