Feat: add sine wavetable generation

Refs: #2

Makefile

@@ -7,7 +7,7 @@ CFLAGS = -Wall -std=c++17 $(OLEVEL) -o $(PROJ)
 
 OBJECTS = src/wtpp.cpp
 
-build: clean
+build:
 	$(CC) $(CFLAGS) $(OBJECTS)
 
 clean:

src/wtpp.cpp

@@ -1,19 +1,23 @@
 #include <array>
+#include <cmath>
 #include <cstdint>
 #include <iostream>
 #include <string>
 #include <type_traits>
 
+#include <math.h>
+
 static const std::uint_fast32_t DEFAULT_SAMPLE_RATE = 44100; // 44.1 kHz sampling rate
 static const std::uint_fast8_t DEFAULT_BIT_DEPTH = 12;
+static const std::uint_fast16_t DEFAULT_N_SAMPLES = 1024;
 
 
 class Wavetable
 {
 private:
-  std::uint_fast16_t m_id {};
+  std::uint_fast16_t m_id {}; // Unique ID number of wavetable
-  std::string m_name {};
+  std::string m_name {}; // String name of wavetable
-  std::array<std::uint_fast32_t, 1024> m_table;
+  std::array<std::float_t, DEFAULT_N_SAMPLES> m_table; // table data
 
 public:
   Wavetable(std::uint_fast16_t id, std::string name)
@@ -29,6 +33,18 @@ public:
     id_str.append(m_name);
     return id_str;
   }
+
+  void set_table(std::array<std::float_t, DEFAULT_N_SAMPLES> table)
+  {
+    m_table = table;
+  }
+
+  void print_head()
+  {
+    for(std::uint_fast8_t i = 0; i < 10; i++) {
+      std::cout << m_table[i] << '\n';
+    }
+  }
 };
 
 /* Logs a message */
@@ -37,10 +53,26 @@ static void log(std::string message)
   std::cout << "wtpp: " << message << '\n';
 }
 
-/* Generates basic sine wave table */
+/* Generates basic sine Wavetable object */
 static Wavetable gen_sin_tbl()
 {
+  // Make the new Wavetable object
   Wavetable table = {0, "sine"};
+  // Make an array to hold our values
+  std::array<std::float_t, DEFAULT_N_SAMPLES> sin_vals {};
+  // Make a place to store calculated value
+  std::float_t val = 0;
+
+  // Loop through number of samples and set table values
+  for (std::uint_fast16_t i = 0; i < DEFAULT_N_SAMPLES; i++) {
+    // Calculate the value of sin at position
+    val = std::sin((2 * M_PI * i) / DEFAULT_N_SAMPLES);
+    sin_vals[i] = val;
+  }
+  // Store values in new Wavetable.table
+  table.set_table(sin_vals);
+
+  // Return the completed Wavetable object
   return table;
 }
 
@@ -53,5 +85,8 @@ int main()
   Wavetable sin_tbl = gen_sin_tbl();
   log(sin_tbl.name());
 
+  log("Printing head of sine table");
+  sin_tbl.print_head();
+
   return 0;
 }