1 files changed, 50 insertions, 0 deletions
diff --git a/muse2/plugins/freeverb/allpass.h b/muse2/plugins/freeverb/allpass.h
new file mode 100644
index 00000000..4eb1c1a0
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+++ b/muse2/plugins/freeverb/allpass.h
@@ -0,0 +1,50 @@
+// Allpass filter declaration
+//
+// Written by Jezar at Dreampoint, June 2000
+// http://www.dreampoint.co.uk
+// This code is public domain
+
+#ifndef _allpass_
+#define _allpass_
+#include "denormals.h"
+
+//---------------------------------------------------------
+//   allpass
+//---------------------------------------------------------
+
+class allpass
+      {
+	float	feedback;
+	float	*buffer;
+	int bufsize;
+	int bufidx;
+
+   public:
+      allpass() { bufidx = 0; }
+	void	setbuffer(float *buf, int size) {
+      	buffer = buf;
+	      bufsize = size;
+            }
+      float process(float input) {
+	      float bufout = buffer[bufidx];
+      	undenormalise(bufout);
+	      float output = -input + bufout;
+      	buffer[bufidx] = input + (bufout*feedback);
+            if (++bufidx >= bufsize)
+                  bufidx = 0;
+//            bufidx = ++bufidx % bufsize;
+      	return output;
+            }
+	void	mute() {
+      	for (int i=0; i<bufsize; i++)
+	      	buffer[i]=0;
+            }
+	void	setfeedback(float val)  { feedback = val; }
+	float	getfeedback()           { return feedback; }
+      };
+
+
+// Big to inline - but crucial for speed
+
+
+#endif//_allpass