Add default wave patterns in channel 3

1 files changed, 15 insertions, 0 deletions

diff --git a/src/rng.c b/src/rng.c
new file mode 100644
index 0000000..96760b8
--- /dev/null
+++ b/src/rng.c
@@ -0,0 +1,15 @@
+u16 rng_state;
+
+u32 hash16(u32 input, u32 key) {
+    u32 hash = input * key;
+    return ((hash >> 16) ^ hash) & 0xFFFF;
+}
+
+u16 rng16() {
+    rng_state += 0xbadd;
+    return hash16(rng_state, 0x10de);
+}
+
+u32 rng32() {
+    return (rng16() << 16) | rng16();
+}