From 7cd2ef47ccf7730ada9a61deacfce6ea03b5516d Mon Sep 17 00:00:00 2001
From: gramanas <anastasis.gramm2@gmail.com>
Date: Tue, 18 Apr 2023 23:33:12 +0300
Subject: Add adsr peak

---
 src/synth_engine.c | 30 ++++++++++++++++--------------
 src/synth_engine.h |  1 +
 src/synth_gui.c    | 10 ++++++----
 3 files changed, 23 insertions(+), 18 deletions(-)

(limited to 'src')

diff --git a/src/synth_engine.c b/src/synth_engine.c
index 41756c7..fc0a53d 100644
--- a/src/synth_engine.c
+++ b/src/synth_engine.c
@@ -19,6 +19,14 @@ convole(float *signal, float *filter, size_t signal_size, size_t filter_size, fl
   }
 }
 
+float
+clamp(float f)
+{
+  if (f <= -1) return -0.9999;
+  if (f >= 1)  return  0.9999;
+  return f;
+}
+
 float
 adsr_amplitude(void *synthData, unsigned long long elapsed)
 {
@@ -26,7 +34,7 @@ adsr_amplitude(void *synthData, unsigned long long elapsed)
 
   float dAmplitude = 0.0;
   float dReleaseAmplitude = 0.0;
-  float dStartAmplitude = 1.0;
+  float dStartAmplitude = synth->adsr.peak;
 
   float dLifeTime = (elapsed * (1.0 / (float)SAMPLE_RATE));
 
@@ -60,7 +68,7 @@ adsr_amplitude(void *synthData, unsigned long long elapsed)
   if (dAmplitude <= 0.000)
     dAmplitude = 0.0;
 
-  return dAmplitude;
+  return clamp(dAmplitude);
 }
 
 
@@ -128,18 +136,11 @@ gen2(float f, unsigned long long phase, float x, unsigned int sample_rate)
 float
 gen3(float f, unsigned long long phase, float x, unsigned int sample_rate)
 {
-  return sawX_sample(0.7, f, 5, phase, sample_rate)
-    + sin_sample(0.3, 4.0/17.0*f, phase, sample_rate);
-  /* return sawX_sample(0.5, f * (1 + sqrt(5)) / 2, 5, phase, sample_rate) */
-  /*   + sin_sample(0.3, f * x, phase, sample_rate) */
-  /*   + sqr_sample(0.2, f * x, 0.2 * x * x, phase, sample_rate); */
-}
-
-float
-clamp(float f)
-{
-  if (f <= -1) return -0.9999;
-  if (f >= 1)  return  0.9999;
+  /* return sawX_sample(0.7, f, 5, phase, sample_rate) */
+  /*   + sin_sample(0.3, 4.0/17.0*f, phase, sample_rate); */
+  return saw_sample(0.5, f * (1 + sqrt(5)) / 2, phase, sample_rate)
+    + sin_sample(0.3, f * x, phase, sample_rate)
+    + sqr_sample(0.2, f * x, 0.2 * x * x, phase, sample_rate);
 }
 
 float
@@ -237,6 +238,7 @@ init_synth(synth_t * synth)
 
 
   synth->adsr.a = 0.0;
+  synth->adsr.peak = 1.0f;
   synth->adsr.d = 0.3;
   synth->adsr.s = 0.7;
   synth->adsr.r = 0.4;
diff --git a/src/synth_engine.h b/src/synth_engine.h
index 674a11e..a540126 100644
--- a/src/synth_engine.h
+++ b/src/synth_engine.h
@@ -23,6 +23,7 @@
 
 typedef struct {
   float a;
+  float peak;
   float d;
   float s;
   float r;
diff --git a/src/synth_gui.c b/src/synth_gui.c
index f92c853..f5e02cf 100644
--- a/src/synth_gui.c
+++ b/src/synth_gui.c
@@ -54,13 +54,15 @@ draw_adsr_sliders(synth_t * synth, int x, int y, int width, int height, int offs
   int count = 0;
   
   snprintf(buf, sizeof buf, "%.3f", synth->adsr.a);
-  synth->adsr.a = GuiSliderBar((Rectangle){ x, y + count++ * (height + offset), width, height }, "A: ", buf, synth->adsr.a , 0.0f, 2.0f);
+  synth->adsr.a = GuiSlider((Rectangle){ x, y + count++ * (height + offset), width, height }, "A: ", buf, synth->adsr.a , 0.0f, 2.0f);
+  snprintf(buf, sizeof buf, "%.3f", synth->adsr.peak);
+  synth->adsr.peak = GuiSlider((Rectangle){ x, y + count++ * (height + offset), width, height }, "P: ", buf, synth->adsr.peak , 0.0f, 1.0f);
   snprintf(buf, sizeof buf, "%.3f", synth->adsr.d);
-  synth->adsr.d = GuiSliderBar((Rectangle){ x, y + count++ * (height + offset), width, height }, "D: ", buf, synth->adsr.d , 0.001f, 2.0f);
+  synth->adsr.d = GuiSlider((Rectangle){ x, y + count++ * (height + offset), width, height }, "D: ", buf, synth->adsr.d , 0.001f, 2.0f);
   snprintf(buf, sizeof buf, "%.3f", synth->adsr.s);
-  synth->adsr.s = GuiSliderBar((Rectangle){ x, y + count++ * (height + offset), width, height }, "S: ", buf, synth->adsr.s , 0.0f, 1.0f);
+  synth->adsr.s = GuiSlider((Rectangle){ x, y + count++ * (height + offset), width, height }, "S: ", buf, synth->adsr.s , 0.0f, 1.0f);
   snprintf(buf, sizeof buf, "%.3f", synth->adsr.r);
-  synth->adsr.r = GuiSliderBar((Rectangle){ x, y + count++ * (height + offset), width, height }, "R: ", buf, synth->adsr.r , -0.001f, 3.0f);
+  synth->adsr.r = GuiSlider((Rectangle){ x, y + count++ * (height + offset), width, height }, "R: ", buf, synth->adsr.r , -0.001f, 3.0f);
   snprintf(buf, sizeof buf, "%.3f", synth->cutoff);
   synth->cutoff = GuiSliderBar((Rectangle){ x, y + count++ * (height + offset), width, height }, "fC: ", buf, synth->cutoff , 0.0f, 11000.0f);
   snprintf(buf, sizeof buf, "%.3f", synth->resonance);
-- 
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