1 files changed, 40 insertions, 0 deletions
diff --git a/lib/PenroseOscil.c b/lib/PenroseOscil.c
new file mode 100644
index 0000000..78cd7b6
--- /dev/null
+++ b/lib/PenroseOscil.c
@@ -0,0 +1,40 @@
+#include <math.h>
+#include "PenroseOscil.h"
+
+
+float frequencyToIncrement( float samplingRate, float frequency, int bufferLength ) {
+
+  return (frequency / samplingRate) * (float) bufferLength;
+} 
+
+void makeSineBuffer( float *buffer, int bufferLength ) {
+  
+  int   i;
+
+  float myTwoPi = 8. * atan(1.);
+
+  for ( i=0; i <= bufferLength; i++ )
+    *(buffer+i) = sin( myTwoPi * ((float) i / (float) bufferLength) );
+
+  return;
+}
+
+
+float bufferOscil( float *phase, float increment, float *buffer,
+                   int bufferLength )
+{
+
+  float sample;
+
+  while ( *phase > bufferLength )
+    *phase -= bufferLength;
+
+  while ( *phase < 0. )
+    *phase += bufferLength;
+
+  sample = *( buffer + (int) (*phase) );
+
+  *phase += increment;
+
+  return sample;
+}