draw: make sure clipdistances work with geometry shaders

we were always fetching the info from the vertex shader, but if
geometry shader is present it should be used as the source of
that info.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/draw/draw_gs.c b/src/gallium/auxiliary/draw/draw_gs.c
index 67e5117c58..74c6279d64 100644
--- a/src/gallium/auxiliary/draw/draw_gs.c
+++ b/src/gallium/auxiliary/draw/draw_gs.c
@@ -791,6 +791,12 @@ draw_create_geometry_shader(struct draw_context *draw,
          gs->position_output = i;
       if (gs->info.output_semantic_name[i] == TGSI_SEMANTIC_VIEWPORT_INDEX)
          gs->viewport_index_output = i;
+      if (gs->info.output_semantic_name[i] == TGSI_SEMANTIC_CLIPDIST) {
+         if (gs->info.output_semantic_index[i] == 0)
+            gs->clipdistance_output[0] = i;
+         else
+            gs->clipdistance_output[1] = i;
+      }
    }
 
    gs->machine = draw->gs.tgsi.machine;