zynaddsubfx

commit c5985f47ddb2dd1b342da0b8ee1347610cc03529
parent 89b13ef0d3ce1012ca48e9bd197d4cbedda8dea5
Author: fundamental <mark.d.mccurry@gmail.com>
Date:   Mon, 29 Aug 2011 22:58:55 -0400

DSP: avoiding log2 for portability

Diffstat:
M
src/DSP/FormantFilter.cpp
 | 
7
+++++--

1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/src/DSP/FormantFilter.cpp b/src/DSP/FormantFilter.cpp
@@ -20,7 +20,6 @@
 
 */
 
-#include <math.h>
 #include <cmath>
 #include <cstdio>
 #include "../Misc/Util.h"
@@ -191,11 +190,15 @@ void FormantFilter::setq(float q_)
 void FormantFilter::setgain(float /*dBgain*/)
 {}
 
+inline float log_2(float x)
+{
+    return log(x)/log(2.0);
+}
 
 void FormantFilter::setfreq_and_q(float frequency, float q_)
 {
     //Convert form real freq[Hz]
-    const float freq = log2(frequency) - 9.96578428; //log2(1000)=9.95748.
+    const float freq = log_2(frequency) - 9.96578428; //log2(1000)=9.95748.
 
     Qfactor = q_;
     setpos(freq);