From 6a2f2911e7ca3e3655dbe419482ecd95f2ed317c Mon Sep 17 00:00:00 2001
From: rkcf <rkcf@rkcf.me>
Date: Sun, 26 Feb 2023 16:38:53 -0600
Subject: [PATCH] Feat: add saw wave lookup table generation

Refs: #2
---
 src/generators.cpp | 15 +++++++++++++++
 src/generators.h   | 19 +++++++------------
 src/wtpp.cpp       |  6 +++++-
 3 files changed, 27 insertions(+), 13 deletions(-)

diff --git a/src/generators.cpp b/src/generators.cpp
index 393dd84..a377710 100644
--- a/src/generators.cpp
+++ b/src/generators.cpp
@@ -33,3 +33,18 @@ sample_table_t gen_squ()
 
   return squ_vals;
 }
+
+sample_table_t gen_saw()
+{
+  sample_table_t saw_vals = {0};
+  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]
+  for (uint16_t i = 0; i < DEFAULT_N_SAMPLES; i++) {
+    saw_vals[i] = val;
+    val += step;
+  }
+
+  return saw_vals;
+}
diff --git a/src/generators.h b/src/generators.h
index 08220e0..9e84223 100644
--- a/src/generators.h
+++ b/src/generators.h
@@ -19,24 +19,19 @@ sample_table_t gen_sin();
  */
 sample_table_t gen_squ();
 
-/*! Generate triangle wave data
-    @return a table of values
- */
-sample_table_t gen_tri();
-
-/*! Generate triangle wave data
-    @return a table of values
- */
-sample_table_t gen_tri();
-
 /*! Generate saw wave data
     @return a table of values
  */
 sample_table_t gen_saw();
 
-/*! Generate ramp wave data
+/*! Generate inverse saw wave data
     @return a table of values
  */
-sample_table_t gen_ramp();
+sample_table_t gen_isaw();
+
+/*! Generate triangle wave data
+    @return a table of values
+ */
+sample_table_t gen_tri();
 
 #endif // GENERATORS_H_
diff --git a/src/wtpp.cpp b/src/wtpp.cpp
index f439150..f06458c 100644
--- a/src/wtpp.cpp
+++ b/src/wtpp.cpp
@@ -25,20 +25,24 @@ static void log(std::string message)
 int main()
 {
   log("Generating wave cycle lookup tables");
-  Wave sin_wave, squ_wave;
+  Wave sin_wave, squ_wave, saw_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();
 
   // Set wave lookup table values
   sin_wave.setTable(sin_vals);
   squ_wave.setTable(squ_vals);
+  saw_wave.setTable(saw_vals);
 
   log("Printing head of sine table");
   sin_wave.print_head();
   log("Printing head of square table");
   squ_wave.print_head();
+  log("Printing head of saw table");
+  saw_wave.print_head();
 
   // Create Wavetable object containing fundamental Wave objects
   Wavetable wt_01{"Fundamental Waves"};