add wavetables

scripts/wavetables/example_wavetable.py

@@ -0,0 +1,52 @@
+
+import math
+from generate_wavetable import generateWavetable
+
+WAVETABLE_FILE_NAME = "config/wavetables/shark_fin.wt"
+
+# process expects a waveform from x=[0, 2pi) centered around f(x)=0
+# normalization is handled by the wavetable generator
+
+def sine(phase):
+    return math.sin(phase)
+
+def square(phase):
+    sample = 1.0
+    if(phase <= math.pi):
+        sample = -1
+    return sample
+
+def saw(phase):
+    return (phase / math.pi) - 1.0
+
+def triangle(phase):
+    sample = 0.0
+    if(phase <= math.pi/2.0):
+        sample = phase * 2.0/math.pi
+    elif(phase <= 3.0*math.pi/2.0):
+        sample = phase * (-2.0/math.pi) + 2.0
+    else:
+        sample = phase * 2.0/math.pi - 4.0
+    return sample
+
+def sharkFin(phase):
+    k = 10.0
+    sample = 0.0
+    if(phase <= math.pi):
+        sample = 2.0 * (phase/math.pi) ** k - 1.0
+    else:
+        sample = -2.0 * (phase/math.pi - 1) ** k + 1.0
+    return sample
+
+def sigmoid(phase):
+    k = 4.0
+    a = -k * (phase - math.pi)
+    sample = 2.0 / (1.0 + math.exp(a)) - 1.0
+    return sample
+
+# pass in the name of your wavetable file and the process function
+def main():
+    generateWavetable(WAVETABLE_FILE_NAME, sharkFin)
+
+if __name__ == "__main__":
+    main()