Feat: add triangle lookup table generator

Refs: #2

src/generators.cpp

@@ -49,7 +49,28 @@ sample_table_t gen_saw()
   return saw_vals;
 }
 
-sample_table_t gen_isaw() {
+sample_table_t gen_tri()
+{
+  sample_table_t tri_vals = {0};
+  uint16_t half_samples = DEFAULT_N_SAMPLES / 2;
+  float_t step = 2.0 / half_samples; // calculate our incremental step size
+  float_t val = 0; // place to store calculate value
+
+  // Start low go high then low [0, 1, 0]
+  for (uint16_t i = 0; i < DEFAULT_N_SAMPLES; i++) {
+    tri_vals[i] = val;
+    if (i < half_samples) {
+      val += step;
+    } else {
+      val -= step;
+    }
+  }
+
+  return tri_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

src/wtpp.cpp

@@ -25,18 +25,20 @@ static void log(std::string message)
 int main()
 {
   log("Generating wave cycle lookup tables");
-  Wave sin_wave, squ_wave, saw_wave, isaw_wave;
+  Wave sin_wave, squ_wave, saw_wave, tri_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 tri_vals = gen_tri();
   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);
+  tri_wave.setTable(tri_vals);
   isaw_wave.setTable(isaw_vals);
 
   log("Printing head of sine table");
@@ -45,6 +47,8 @@ int main()
   squ_wave.print_head();
   log("Printing head of saw table");
   saw_wave.print_head();
+  log("Printing head of triangle table");
+  tri_wave.print_head();
   log("Printing head of inverse saw table");
   isaw_wave.print_head();