moar

1 files changed, 28 insertions, 0 deletions

diff --git a/src/osc_saw.c b/src/osc_saw.c
new file mode 100644
index 0000000..fc31f6f
--- /dev/null
+++ b/src/osc_saw.c
@@ -0,0 +1,28 @@
+#include "osc.h"
+
+osc_t OSC_saw = MAKE_OSC("f_saw", 20000, WAVE);
+
+OSC_COMMON(saw)
+
+float
+sawX(float sm, int offset, int len)
+{
+  float dOutput = 0.0;
+  for (float n = 1.0; n < sm; n++)
+    dOutput += (sinf(n * 2.0 * M_PI * offset / len)) / n;
+  return 0.5 * dOutput;
+}
+
+float
+osc_saw(float offset)
+{
+  return osc_interpolate(offset,
+                         sawX(25, (int)offset, OSC_saw.len),
+                         sawX(25, osc_next_index(&OSC_saw, offset), OSC_saw.len));
+}
+
+float
+osc_saw_next(float f, float offset)
+{
+  return osc_next_offset(&OSC_saw, f, offset);
+}