radeonsi: assume that a VS without POSITION is LS

Tested-by: Edmondo Tommasina <edmondo.tommasina@gmail.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

diff --git a/src/gallium/drivers/radeonsi/si_state_shaders.c b/src/gallium/drivers/radeonsi/si_state_shaders.c
index 9e95fea..d0869e3 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_state_shaders.c
+++ b/src/gallium/drivers/radeonsi/si_state_shaders.c
@@ -1124,6 +1124,13 @@ static void si_parse_next_shader_property(const struct tgsi_shader_info *info,
                case PIPE_SHADER_TESS_EVAL:
                        key->vs.as_ls = 1;
                        break;
+               default:
+                       /* If POSITION isn't written, it can't be a HW VS.
+                        * Assume that it's a HW LS. (the next shader is TCS)
+                        * This heuristic is needed for separate shader objects.
+                        */
+                       if (!info->writes_position)
+                               key->as_ls = 1;
                }
                break;