configurable wavetable files

scripts/example_wavetable.py

@@ -1,5 +1,38 @@
 
 import math
 
-def process(phase):
+WAVETABLE_FILE_NAME = "triangle"
+
+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):
+    return 1
+
+def sphere(phase):
+    return 1
+
+# process get called by generate_wavetable.py
+# it calculates a single sample at a specified phase
+# normalization is handled by generate_wavetable.py
+def process(phase):
+    return triangle(phase)

scripts/generate_wavetable.py

@@ -21,8 +21,9 @@ import example_wavetable
 wavetableLength = 2048
 
 def createFile():
-    print("creating file")
-    file = open("sine.wt", "wb")
+    filename = example_wavetable.WAVETABLE_FILE_NAME + ".wt"
+    print("creating file " + filename)
+    file = open(filename, "wb")
     return file
 
 def writeMetadata(file):