radeonsi: Compile dummy pixel shader on demand

It's never used under normal circumstances.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/drivers/radeonsi/si_pipe.c

@@ -27,7 +27,6 @@
 
 #include "radeon/radeon_uvd.h"
 #include "util/u_memory.h"
-#include "util/u_simple_shaders.h"
 #include "vl/vl_decoder.h"
 
 /*
@@ -124,12 +123,6 @@ static struct pipe_context *si_create_context(struct pipe_screen *screen, void *
 		goto fail;
 	sctx->blitter->draw_rectangle = r600_draw_rectangle;
 
-	sctx->dummy_pixel_shader =
-		util_make_fragment_cloneinput_shader(&sctx->b.b, 0,
-						     TGSI_SEMANTIC_GENERIC,
-						     TGSI_INTERPOLATE_CONSTANT);
-	sctx->b.b.bind_fs_state(&sctx->b.b, sctx->dummy_pixel_shader);
-
 	/* these must be last */
 	si_begin_new_cs(sctx);
 	r600_query_init_backend_mask(&sctx->b); /* this emits commands and must be last */

src/gallium/drivers/radeonsi/si_state.c

@@ -36,6 +36,7 @@
 #include "util/u_framebuffer.h"
 #include "util/u_helpers.h"
 #include "util/u_memory.h"
+#include "util/u_simple_shaders.h"
 
 static void si_init_atom(struct r600_atom *atom, struct r600_atom **list_elem,
 			 void (*emit)(struct si_context *ctx, struct r600_atom *state),
@@ -2283,8 +2284,16 @@ static void si_bind_ps_shader(struct pipe_context *ctx, void *state)
 		return;
 
 	/* use dummy shader if supplied shader is corrupt */
-	if (!sel || !sel->current)
+	if (!sel || !sel->current) {
+		if (!sctx->dummy_pixel_shader) {
+			sctx->dummy_pixel_shader =
+				util_make_fragment_cloneinput_shader(&sctx->b.b, 0,
+								     TGSI_SEMANTIC_GENERIC,
+								     TGSI_INTERPOLATE_CONSTANT);
+		}
+
 		sel = sctx->dummy_pixel_shader;
+	}
 
 	sctx->ps_shader = sel;
 }