1 files changed, 18 insertions, 0 deletions

diff --git a/src/globals.c b/src/globals.c
index 05c964a..5063d69 100644
--- a/src/globals.c
+++ b/src/globals.c
@@ -1,3 +1,15 @@
+enum WAVES {
+    WAVE_SIN,
+    WAVE_SAW,
+    WAVE_SQUARE,
+    WAVE_MAX,
+};
+
+#define WAVE_SIZE 4
+#define WAVE_VARS 4
+
+typedef u32 Wave[WAVE_SIZE];
+
 //
 // Globals.
 //
@@ -209,3 +221,9 @@ bool redraw_scale = true;
 bool update_bpm = false;
 u8 bar_counter = 0;
 
+static Wave wave_active = {0};
+// static Wave wave_target = {0};
+// TODO: wave env status: OFF, ATTACK, DECAY
+static int wave_env_ticks = 0;
+static int wave_env_attack = 8;
+static int wave_env_decay = 8;