From 7341d8a8cfd1989eb49b21eedea0808b0e47b5d8 Mon Sep 17 00:00:00 2001
From: John Alanbrook <john@pockle.world>
Date: Tue, 5 Jul 2022 02:44:39 +0000
Subject: [PATCH] synths

---
 source/engine/dsp.c | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

diff --git a/source/engine/dsp.c b/source/engine/dsp.c
index 30d832a..b8d9b5a 100644
--- a/source/engine/dsp.c
+++ b/source/engine/dsp.c
@@ -34,8 +34,9 @@ struct wav gen_sine(float amp, float freq, int sr, int ch)
     short *data = (short*)new.data;
 
     for (int i = 0; i < new.frames; i++) {
+        short val = amp * sin(2*PI*((float)i / new.frames));
         for (int j = 0; j < new.ch; j++) {
-            data[i+j] =amp * sin(2*PI*((float)i / new.frames));
+            data[i+j] = val;
         }
     }
 
@@ -55,15 +56,10 @@ struct wav gen_square(float amp, float freq, int sr, int ch)
 
     short *data = (short*)new.data;
 
-    for (int i = 0; i < crossover; i++) {
+    for (int i = 0; i < new.frames; i++) {
+        short val = -2 * floor(2 * i / new.frames) + 1;
         for (int j = 0; j < new.ch; j++) {
-            data[i+j] = samp;
-        }
-    }
-
-    for (int i = crossover; i < new.frames; i++) {
-        for (int j = 0; j < new.ch; j++) {
-            data[i+j] = samp * -1;
+            data[i+j] = val;
         }
     }
 
@@ -77,11 +73,25 @@ struct wav gen_triangle(float amp, float freq, int sr, int ch)
     if (amp > 1) amp = 1;
     if (amp < 0) amp = 0;
 
+    for (int i = 0; i < new.frames; i++) {
+        short val = 2 * abs( (i/new.frames) - floor( (i/new.frames) + 0.5));
+        for (int j = 0; j < new.ch; j++) {
+            new.data[i+j] = val;
+        }
+    }
+}
 
+struct wav gen_saw(float amp, float freq, int sr, int ch)
+{
+    struct wav new = make_wav(freq, sr, ch);
+
+    if (amp > 1) amp = 1;
+    if (amp < 0) amp = 0;
 
     for (int i = 0; i < new.frames; i++) {
+        short val = 2 * ( (i/new.frames) - floor( (0.5 + (i/new.frames))));
         for (int j = 0; j < new.ch; j++) {
-            //new.data[i+j] =
+            new.data[i+j] = val;
         }
     }
 }
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