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, 18 insertions, 2 deletions

diff --git a/src/pig.c b/src/pig.c
index 1af910f..97d09fe 100644
--- a/src/pig.c
+++ b/src/pig.c
@@ -27,6 +27,7 @@
 #include "m4f.h"
 #include "macros.h"
 #include "pig.h"
+#include "sad-node.h"
 #include "shader-node.h"
 #include "shader.h"
 
@@ -63,8 +64,12 @@ static void pig_uniforms_func(shader_t *shader, void *uniforms_ctxt, void *rende
 	unsigned	t0, t1;
 	float		r = randf();
 
-	if (play_ticks_elapsed(play, PLAY_TICKS_TIMER2, 1000))
-		shader_reload_files(shader);
+	if (play_ticks_elapsed(play, PLAY_TICKS_TIMER2, 1000)) {
+		if (shader_reload_files(shader) < 0)
+			stage_set_active(pig->sadface, 1);
+		else
+			stage_set_active(pig->sadface, 0);
+	}
 
 	/* this one just keeps increasing */
 	t0 = play_ticks(play, PLAY_TICKS_TIMER0);
@@ -212,6 +217,17 @@ static void * pig_init(play_t *play, int argc, char *argv[], unsigned flags)
 		&pig->color
 	);
 
+	pig->sadface = sad_node_new(&(stage_conf_t){
+			.parent = pig->stage,
+			.name = "sadface",
+			.layer = 3,
+			.active = 0,
+			.alpha = 1.f,
+		},
+		&pig->transform,
+		&pig->color
+	);
+
 	(void) shader_node_new_files(&(stage_conf_t){
 			.parent = pig->stage,
 			.name = "shader",