+}
+
+
+/**
+ * Helper function to set the fragment shaders.
+ */
+static INLINE void
+set_fragment_shader(struct st_context *st)
+{
+ if (!st->clear.fs)
+ st->clear.fs =
+ util_make_fragment_passthrough_shader(st->pipe, TGSI_SEMANTIC_GENERIC,
+ TGSI_INTERPOLATE_CONSTANT,
+ TRUE);
+
+ cso_set_fragment_shader_handle(st->cso_context, st->clear.fs);
+}
+
+
+/**
+ * Helper function to set the vertex shader.
+ */
+static INLINE void
+set_vertex_shader(struct st_context *st)
+{
+ /* vertex shader - still required to provide the linkage between
+ * fragment shader input semantics and vertex_element/buffers.
+ */
+ if (!st->clear.vs)
+ {
+ const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
+ TGSI_SEMANTIC_GENERIC };
+ const uint semantic_indexes[] = { 0, 0 };
+ st->clear.vs = util_make_vertex_passthrough_shader(st->pipe, 2,
+ semantic_names,
+ semantic_indexes);
+ }
+
+ cso_set_vertex_shader_handle(st->cso_context, st->clear.vs);
+}
+
+
+static void
+set_vertex_shader_layered(struct st_context *st)
+{
+ struct pipe_context *pipe = st->pipe;
+
+ if (!pipe->screen->get_param(pipe->screen, PIPE_CAP_TGSI_INSTANCEID) ||
+ !pipe->screen->get_param(pipe->screen, PIPE_CAP_TGSI_VS_LAYER)) {
+ assert(!"Got layered clear, but the VS layer output is unsupported");
+ set_vertex_shader(st);
+ return;