pig: show sad face on shader errors

Introduces sad-node.[ch] implementing a simple sad face shader node,
normally inactive but made active when the shader files fail to reload.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/pig.h b/src/pig.h
index 3f0a24c..849e290 100644
--- a/src/pig.h
+++ b/src/pig.h
@@ -28,6 +28,7 @@ typedef struct pig_t {
 	SDL_Window	*window;
 	SDL_GLContext	*gl;
 	stage_t		*stage;
+	stage_t		*sadface;
 	unsigned	window_width, window_height;
 	unsigned	windowed:1;
 	m4f_t		transform;