Feat: add inverse saw lookup table generation

Refs: #2

src/generators.cpp

@@ -27,7 +27,7 @@ sample_table_t gen_squ()
     if (i < (DEFAULT_N_SAMPLES / 2)) {
       squ_vals[i] = 1;
     } else {
-      squ_vals[i] = -1;
+      squ_vals[i] = 0;
     }
   }
 
@@ -40,7 +40,7 @@ sample_table_t gen_saw()
   float_t step = 2.0 / DEFAULT_N_SAMPLES; // calculate our incremental step size
   float_t val = 0; // place to store calculate value
 
-  // Start low go high [-1, 1]
+  // Start low go high [0, 1]
   for (uint16_t i = 0; i < DEFAULT_N_SAMPLES; i++) {
     saw_vals[i] = val;
     val += step;
@@ -48,3 +48,17 @@ sample_table_t gen_saw()
 
   return saw_vals;
 }
+
+sample_table_t gen_isaw() {
+  sample_table_t isaw_vals = {0};
+  float_t step = 2.0 / DEFAULT_N_SAMPLES; // calculate our incremental step size
+  float_t val = 1; // place to store calculate value
+
+  // Start high go low [1, 0]
+  for (uint16_t i = 0; i < DEFAULT_N_SAMPLES; i++) {
+    isaw_vals[i] = val;
+    val -= step;
+  }
+
+  return isaw_vals;
+}

src/wtpp.cpp

@@ -25,17 +25,19 @@ static void log(std::string message)
 int main()
 {
   log("Generating wave cycle lookup tables");
-  Wave sin_wave, squ_wave, saw_wave;
+  Wave sin_wave, squ_wave, saw_wave, isaw_wave;
 
   // Calculate fundamental wave values
   sample_table_t sin_vals = gen_sin();
   sample_table_t squ_vals = gen_squ();
   sample_table_t saw_vals = gen_saw();
+  sample_table_t isaw_vals = gen_isaw();
 
   // Set wave lookup table values
   sin_wave.setTable(sin_vals);
   squ_wave.setTable(squ_vals);
   saw_wave.setTable(saw_vals);
+  isaw_wave.setTable(isaw_vals);
 
   log("Printing head of sine table");
   sin_wave.print_head();
@@ -43,6 +45,8 @@ int main()
   squ_wave.print_head();
   log("Printing head of saw table");
   saw_wave.print_head();
+  log("Printing head of inverse saw table");
+  isaw_wave.print_head();
 
   // Create Wavetable object containing fundamental Wave objects
   Wavetable wt_01{"Fundamental Waves"};