UI: Instrument settings

1 files changed, 401 insertions, 146 deletions

diff --git a/source/saw/main.c b/source/saw/main.c
index 123dcbd..b5f46be 100644
--- a/source/saw/main.c
+++ b/source/saw/main.c
@@ -1,4 +1,5 @@
 #include "profiler.h"
+#include "version.h"
 
 #include "../kit/math.h"
 #include "../kit/time.h"
@@ -22,6 +23,7 @@
 #include "../thirdparty/nanovg_gl.h"
 
 #include <stdio.h>
+#include <stdlib.h>
 
 #include "font.inl.h"
 
@@ -29,15 +31,29 @@ enum {
   SAW_CHANNEL_COUNT = 2,
   SAW_SAMPLE_RATE   = 44100,
 
-  VOICE_COUNT = 16,
-  ROLL_SIZE   = 80,
-  SHEET_SIZE  = 200,
-  ROLL_COUNT  = 16,
-  TRACK_COUNT = 8,
+  TRACK_COUNT  = 16,
+  ROLL_COUNT   = 32,
+  PITCH_COUNT  = 80,
+  VOICE_COUNT  = 16,
+  UNISON_COUNT = 100,
+  SHEET_SIZE   = 200,
 
   ROLL_DEFAULT_OFFSET_Y = 710,
 
   INSTRUMENT_SINE = 0,
+
+  TRACK_INPUT_NONE = 0,
+  TRACK_INPUT_INSTRUMENT,
+  TRACK_INPUT_WARP,
+  TRACK_INPUT_PHASE,
+  TRACK_INPUT_UNISON,
+  TRACK_INPUT_SPREAD,
+  TRACK_INPUT_STEREO_WIDTH,
+  TRACK_INPUT_VOLUME,
+  TRACK_INPUT_SUSTAIN,
+  TRACK_INPUT_ATTACK,
+  TRACK_INPUT_DECAY,
+  TRACK_INPUT_RELEASE,
 };
 
 typedef struct {
@@ -46,7 +62,8 @@ typedef struct {
   f64 duration;
   f64 frequency;
   f64 amplitude;
-  f64 stereo_factor;
+  f64 phase[2];
+  i64 track;
 } saw_voice_t;
 
 typedef struct {
@@ -60,7 +77,7 @@ typedef struct {
   i8              enabled;
   i64             track;
   i32             last_index;
-  i8              turned_off[ROLL_SIZE];
+  i8              pitch_turned_off[PITCH_COUNT];
   i64             rate;
   saw_roll_note_t notes[SHEET_SIZE];
   i64             frame;
@@ -85,9 +102,13 @@ typedef struct {
   i32            instrument;
   f64            warp;
   f64            phase;
+  i32            unison;
+  f64            spread;
   f64            stereo_width;
   f64            volume;
   saw_envelope_t envelope;
+  i32            value_input;
+  f64            value_buffer;
 } saw_track_t;
 
 typedef struct {
@@ -144,11 +165,11 @@ static saw_compose_t saw_compose = {
 #endif
 
 static f64 saw_random(f64 min, f64 max) {
-  if (max < min)
+  if (max - min < .000001)
     return min;
   u64 x     = mt64_generate(&saw_mt64);
   u64 range = (u64) ((max - min) * 10000 + 0.5);
-  return min + (max - min) * (range * (x % (range + 1)));
+  return min + (max - min) * ((1.0 / range) * (x % (range + 1)));
 }
 
 static f64 saw_envelope(f64 t, f64 attack, f64 decay, f64 sustain,
@@ -175,6 +196,30 @@ static f64 saw_pitch_amplitude(i64 pitch) {
   return .2 / exp(0.02 * pitch);
 }
 
+static void saw_play_voice(saw_track_t *track, saw_roll_t *roll,
+                           i64 pitch, i64 duration) {
+  if (saw_voices[VOICE_COUNT - 1].enabled)
+    return;
+
+  for (i32 n = VOICE_COUNT - 1; n > 0; --n)
+    saw_voices[n] = saw_voices[n - 1];
+
+  f64 s = track->stereo_width / 8;
+
+  saw_voices[0] = (saw_voice_t) {
+    .enabled   = 1,
+    .time      = 0,
+    .duration  = ((f64) duration) / roll->rate,
+    .frequency = saw_pitch_frequency(pitch),
+    .amplitude = saw_pitch_amplitude(pitch) * track->volume,
+    .phase = {
+      saw_random(-s, s),
+      saw_random(-s, s),
+    },
+    .track     = roll->track,
+  };
+}
+
 static void saw_playback(i32 frame_count) {
   if (!saw_playback_on)
     return;
@@ -188,28 +233,17 @@ static void saw_playback(i32 frame_count) {
       continue;
 
     for (i32 i = 0; i < SHEET_SIZE; i++) {
-      saw_roll_note_t *p = roll->notes + i;
-      if (!p->enabled)
+      saw_roll_note_t *note = roll->notes + i;
+      if (!note->enabled)
         continue;
       i64 frame = roll->frame +
-                  (p->time * SAW_SAMPLE_RATE) / roll->rate;
+                  (note->time * SAW_SAMPLE_RATE) / roll->rate;
       if (saw_playback_frame + frame_count <= frame ||
           saw_playback_frame > frame)
         continue;
-      if (saw_voices[VOICE_COUNT - 1].enabled)
-        continue;
 
-      for (i32 n = VOICE_COUNT - 1; n > 0; --n)
-        saw_voices[n] = saw_voices[n - 1];
-
-      saw_voices[0] = (saw_voice_t) {
-        .enabled       = 1,
-        .time          = 0,
-        .duration      = ((f64) p->duration) / roll->rate,
-        .frequency     = saw_pitch_frequency(p->pitch),
-        .amplitude     = saw_pitch_amplitude(p->pitch),
-        .stereo_factor = saw_random(-0.01, 0.01),
-      };
+      saw_play_voice(saw_tracks + roll->track, roll, note->pitch,
+                     note->duration);
     }
   }
 
@@ -231,26 +265,28 @@ static void saw_audio(ma_device *device, void *void_out_,
     if (!saw_voices[n].enabled)
       continue;
 
-    f64 period        = M_PI * 2.;
-    f64 frequency     = saw_voices[n].frequency;
-    f64 amplitude     = saw_voices[n].amplitude;
-    f64 stereo_factor = saw_voices[n].stereo_factor;
+    saw_track_t *track = saw_tracks + saw_voices[n].track;
+
+    f64 period    = M_PI * 2.;
+    f64 frequency = saw_voices[n].frequency;
+    f64 amplitude = saw_voices[n].amplitude;
+    f64 phase_l   = track->phase + saw_voices[n].phase[0];
+    f64 phase_r   = track->phase + saw_voices[n].phase[1];
 
-    //  envelope
-    f64 attack   = .007;
-    f64 decay    = .3;
-    f64 sustain  = .15;
+    f64 attack   = track->envelope.attack;
+    f64 decay    = track->envelope.decay;
+    f64 sustain  = track->envelope.sustain;
     f64 duration = saw_voices[n].duration;
-    f64 release  = .4;
+    f64 release  = track->envelope.release;
 
     for (i64 i = 0; i < frame_count; i++) {
       f64 t = (f64) saw_voices[n].time / (f64) SAW_SAMPLE_RATE;
       f64 a = amplitude * saw_envelope(t, attack, decay, sustain,
                                        duration, release);
-      f64 k = period * frequency;
-
-      out[i * 2] += (f32) (sin(k * t) * a);
-      out[i * 2 + 1] += (f32) (sin(k * t + stereo_factor) * a);
+      out[i * 2] += (f32) (sin((t * frequency + phase_l) * period) *
+                           a);
+      out[i * 2 + 1] +=
+          (f32) (sin((t * frequency + phase_r) * period) * a);
 
       saw_voices[n].time++;
 
@@ -432,21 +468,21 @@ static void saw_ui_compose(i64 x0, i64 y0, i64 width, i64 height) {
           }
 
         saw_rolls[n] = (saw_roll_t) {
-          .enabled        = 1,
-          .track          = track,
-          .last_index     = -1,
-          .turned_off     = { 0 },
-          .rate           = 6,
-          .notes          = { 0 },
-          .frame          = frame,
-          .size           = 6 / grid_rate,
-          .grid_input     = 0,
-          .grid_note      = 0,
-          .grid_time      = 0,
-          .offset_x_input = 0,
-          .offset_y_input = 0,
-          .offset_x       = 0,
-          .offset_y       = ROLL_DEFAULT_OFFSET_Y,
+          .enabled          = 1,
+          .track            = track,
+          .last_index       = -1,
+          .pitch_turned_off = { 0 },
+          .rate             = 6,
+          .notes            = { 0 },
+          .frame            = frame,
+          .size             = 6 / grid_rate,
+          .grid_input       = 0,
+          .grid_note        = 0,
+          .grid_time        = 0,
+          .offset_x_input   = 0,
+          .offset_y_input   = 0,
+          .offset_x         = 0,
+          .offset_y         = ROLL_DEFAULT_OFFSET_Y,
         };
 
         saw_current_roll  = n;
@@ -554,7 +590,7 @@ static void saw_ui_compose(i64 x0, i64 y0, i64 width, i64 height) {
             saw_compose.offset_y + track * track_height;
     i64 w = grid_scale / grid_rate;
 
-    if (track >= 0 && track < ROLL_COUNT && x >= x0 &&
+    if (track >= 0 && track < TRACK_COUNT && x >= x0 &&
         x + w < x0 + width &&
         y >= frame_height - y0 - height + track_height &&
         y + track_height < frame_height - y0) {
@@ -595,6 +631,96 @@ static void saw_ui_track(saw_track_t *track, i64 x0, i64 y0,
   i64 border        = 2;
   i64 column_width  = 200;
 
+  i64 next_y = header_offset;
+
+  //  Values input and highlight
+  //
+
+  if (!saw_lbutton_down && track->value_input != TRACK_INPUT_NONE) {
+    track->value_input  = TRACK_INPUT_NONE;
+    track->value_buffer = 0;
+    sapp_lock_mouse(0);
+  }
+
+  for (i32 input_index = TRACK_INPUT_INSTRUMENT;
+       input_index <= TRACK_INPUT_RELEASE; ++input_index) {
+    if ((track->value_input == TRACK_INPUT_NONE ||
+         track->value_input == input_index) &&
+        saw_mouse_x >= x0 && saw_mouse_x < x0 + width &&
+        saw_mouse_y >= frame_height - y0 - height + next_y &&
+        saw_mouse_y <
+            frame_height - y0 - height + next_y + text_height) {
+      i64 x = x0 + column_width;
+      i64 y = frame_height - y0 - height + next_y;
+      i64 w = width - column_width;
+      i64 h = text_height;
+
+      if (w > 0) {
+        nvgBeginPath(saw_nvg);
+        nvgRect(saw_nvg, x + border, y, w - border * 2, h);
+        nvgFillColor(saw_nvg, nvgRGBA(200, 240, 200, 80));
+        nvgFill(saw_nvg);
+      }
+
+      if (saw_lbutton_click &&
+          track->value_input == TRACK_INPUT_NONE) {
+        sapp_lock_mouse(1);
+        track->value_input = input_index;
+
+        switch (input_index) {
+          case TRACK_INPUT_INSTRUMENT:
+            track->value_buffer = track->instrument * 100;
+            break;
+
+          case TRACK_INPUT_UNISON:
+            track->value_buffer = track->unison * 100;
+            break;
+
+          case TRACK_INPUT_WARP:
+            track->value_buffer = track->warp * 10000;
+            break;
+
+          case TRACK_INPUT_PHASE:
+            track->value_buffer = track->phase * 10000;
+            break;
+
+          case TRACK_INPUT_SPREAD:
+            track->value_buffer = track->spread * 10000;
+            break;
+
+          case TRACK_INPUT_STEREO_WIDTH:
+            track->value_buffer = track->stereo_width * 10000;
+            break;
+
+          case TRACK_INPUT_VOLUME:
+            track->value_buffer = track->volume * 10000;
+            break;
+
+          case TRACK_INPUT_SUSTAIN:
+            track->value_buffer = track->envelope.sustain * 10000;
+            break;
+
+          case TRACK_INPUT_ATTACK:
+            track->value_buffer = track->envelope.attack * 100000;
+            break;
+
+          case TRACK_INPUT_DECAY:
+            track->value_buffer = track->envelope.decay * 100000;
+            break;
+
+          case TRACK_INPUT_RELEASE:
+            track->value_buffer = track->envelope.release * 100000;
+            break;
+
+          default:;
+        }
+      }
+    }
+    if (input_index == TRACK_INPUT_VOLUME)
+      next_y += header_offset;
+    next_y += text_height;
+  }
+
   //  Draw text
   //
 
@@ -606,88 +732,102 @@ static void saw_ui_track(saw_track_t *track, i64 x0, i64 y0,
   nvgText(saw_nvg, x0 + border * 2,
           frame_height - y0 - height + text_height - border * 2,
           title.values, title.values + title.size);
+  next_y = header_offset + text_height;
 
   char buf_instr[][100] = { "Sine" };
   nvgText(saw_nvg, x0 + border * 2,
-          frame_height - y0 - height + header_offset + text_height -
-              border * 2,
+          frame_height - y0 - height + next_y - border * 2,
           "Instrument", 0);
   nvgText(saw_nvg, x0 + column_width + border * 2,
-          frame_height - y0 - height + header_offset + text_height -
-              border * 2,
+          frame_height - y0 - height + next_y - border * 2,
           buf_instr[track->instrument], 0);
+  next_y += text_height;
 
   char buf[100];
-  sprintf(buf, "%d", (i32) (track->phase * 100 + 0.5));
+  sprintf(buf, "%.3f", (f32) track->warp);
   nvgText(saw_nvg, x0 + border * 2,
-          frame_height - y0 - height + header_offset +
-              text_height * 2 - border * 2,
-          "Phase", 0);
+          frame_height - y0 - height + next_y - border * 2, "Warp",
+          0);
   nvgText(saw_nvg, x0 + column_width + border * 2,
-          frame_height - y0 - height + header_offset +
-              text_height * 2 - border * 2,
-          buf, 0);
+          frame_height - y0 - height + next_y - border * 2, buf, 0);
+  next_y += text_height;
 
-  sprintf(buf, "%d", (i32) (track->stereo_width * 100 + 0.5));
+  sprintf(buf, "%.3f", (f32) track->phase);
   nvgText(saw_nvg, x0 + border * 2,
-          frame_height - y0 - height + header_offset +
-              text_height * 3 - border * 2,
+          frame_height - y0 - height + next_y - border * 2, "Phase",
+          0);
+  nvgText(saw_nvg, x0 + column_width + border * 2,
+          frame_height - y0 - height + next_y - border * 2, buf, 0);
+  next_y += text_height;
+
+  sprintf(buf, "%d", (i32) track->unison);
+  nvgText(saw_nvg, x0 + border * 2,
+          frame_height - y0 - height + next_y - border * 2, "Unison",
+          0);
+  nvgText(saw_nvg, x0 + column_width + border * 2,
+          frame_height - y0 - height + next_y - border * 2, buf, 0);
+  next_y += text_height;
+
+  sprintf(buf, "%.3f", (f32) track->spread);
+  nvgText(saw_nvg, x0 + border * 2,
+          frame_height - y0 - height + next_y - border * 2, "Spread",
+          0);
+  nvgText(saw_nvg, x0 + column_width + border * 2,
+          frame_height - y0 - height + next_y - border * 2, buf, 0);
+  next_y += text_height;
+
+  sprintf(buf, "%.3f", (f32) track->stereo_width);
+  nvgText(saw_nvg, x0 + border * 2,
+          frame_height - y0 - height + next_y - border * 2,
           "Stereo width", 0);
   nvgText(saw_nvg, x0 + column_width + border * 2,
-          frame_height - y0 - height + header_offset +
-              text_height * 3 - border * 2,
-          buf, 0);
+          frame_height - y0 - height + next_y - border * 2, buf, 0);
+  next_y += text_height;
 
-  sprintf(buf, "%d", (i32) (track->volume * 100 + 0.5));
+  sprintf(buf, "%.3f", (f32) track->volume);
   nvgText(saw_nvg, x0 + border * 2,
-          frame_height - y0 - height + header_offset +
-              text_height * 4 - border * 2,
-          "Volume", 0);
+          frame_height - y0 - height + next_y - border * 2, "Volume",
+          0);
   nvgText(saw_nvg, x0 + column_width + border * 2,
-          frame_height - y0 - height + header_offset +
-              text_height * 4 - border * 2,
-          buf, 0);
+          frame_height - y0 - height + next_y - border * 2, buf, 0);
+  next_y += header_offset;
 
   nvgText(saw_nvg, x0 + border * 2,
-          frame_height - y0 - height + header_offset +
-              text_height * 6 - border * 2,
+          frame_height - y0 - height + next_y - border * 2,
           "Envelope", 0);
+  next_y += text_height;
+
   sprintf(buf, "%.3f", (f32) track->envelope.sustain);
   nvgText(saw_nvg, x0 + column_width / 4 + border * 2,
-          frame_height - y0 - height + header_offset +
-              text_height * 7 - border * 2,
-          "Sustain", 0);
+          frame_height - y0 - height + next_y - border * 2, "Sustain",
+          0);
   nvgText(saw_nvg, x0 + column_width + border * 2,
-          frame_height - y0 - height + header_offset +
-              text_height * 7 - border * 2,
-          buf, 0);
+          frame_height - y0 - height + next_y - border * 2, buf, 0);
+  next_y += text_height;
+
   sprintf(buf, "%.1f ms", (f32) (track->envelope.attack * 1000));
   nvgText(saw_nvg, x0 + column_width / 4 + border * 2,
-          frame_height - y0 - height + header_offset +
-              text_height * 8 - border * 2,
-          "Attack", 0);
+          frame_height - y0 - height + next_y - border * 2, "Attack",
+          0);
   nvgText(saw_nvg, x0 + column_width + border * 2,
-          frame_height - y0 - height + header_offset +
-              text_height * 8 - border * 2,
-          buf, 0);
+          frame_height - y0 - height + next_y - border * 2, buf, 0);
+  next_y += text_height;
+
   sprintf(buf, "%.1f ms", (f32) (track->envelope.decay * 1000));
   nvgText(saw_nvg, x0 + column_width / 4 + border * 2,
-          frame_height - y0 - height + header_offset +
-              text_height * 9 - border * 2,
-          "Decay", 0);
+          frame_height - y0 - height + next_y - border * 2, "Decay",
+          0);
   nvgText(saw_nvg, x0 + column_width + border * 2,
-          frame_height - y0 - height + header_offset +
-              text_height * 9 - border * 2,
-          buf, 0);
+          frame_height - y0 - height + next_y - border * 2, buf, 0);
+  next_y += text_height;
+
   sprintf(buf, "%.1f ms", (f32) (track->envelope.release * 1000));
   nvgText(saw_nvg, x0 + column_width / 4 + border * 2,
-          frame_height - y0 - height + header_offset +
-              text_height * 10 - border * 2,
-          "Release", 0);
+          frame_height - y0 - height + next_y - border * 2, "Release",
+          0);
   nvgText(saw_nvg, x0 + column_width + border * 2,
-          frame_height - y0 - height + header_offset +
-              text_height * 10 - border * 2,
-          buf, 0);
+          frame_height - y0 - height + next_y - border * 2, buf, 0);
+  next_y += text_height;
 
   nvgFill(saw_nvg);
 }
@@ -710,7 +850,7 @@ static void saw_ui_roll(saw_roll_t *roll, i64 x0, i64 y0, i64 width,
   nvgBeginPath(saw_nvg);
   nvgRect(saw_nvg, x0, frame_height - y0 - height, width,
           text_height);
-  nvgFillColor(saw_nvg, nvgRGBA(100, 80, 70, 160));
+  nvgFillColor(saw_nvg, nvgRGBA(80, 60, 50, 160));
   nvgFill(saw_nvg);
 
   nvgBeginPath(saw_nvg);
@@ -727,7 +867,7 @@ static void saw_ui_roll(saw_roll_t *roll, i64 x0, i64 y0, i64 width,
 
   i8 hover_any = 0;
 
-  for (i32 pitch = 0; pitch < ROLL_SIZE; pitch++) {
+  for (i32 pitch = 0; pitch < PITCH_COUNT; pitch++) {
     i32 x = x0 + border;
     i32 y = frame_height - y0 - (pitch + 1) * pianokey_height +
             border + roll->offset_y;
@@ -745,7 +885,7 @@ static void saw_ui_roll(saw_roll_t *roll, i64 x0, i64 y0, i64 width,
     i8 has_cursor = saw_mouse_x >= x && saw_mouse_x < x + w &&
                     saw_mouse_y >= y && saw_mouse_y < y + h;
 
-    nvgFillColor(saw_nvg, roll->turned_off[pitch]
+    nvgFillColor(saw_nvg, roll->pitch_turned_off[pitch]
                               ? nvgRGBA(220, 220, 220, 160)
                           : has_cursor ? nvgRGBA(200, 200, 255, 255)
                                        : nvgRGBA(220, 220, 220, 255));
@@ -757,25 +897,14 @@ static void saw_ui_roll(saw_roll_t *roll, i64 x0, i64 y0, i64 width,
     if (has_cursor) {
       hover_any = 1;
 
-      if (!roll->turned_off[pitch] &&
+      if (!roll->pitch_turned_off[pitch] &&
           (saw_lbutton_click ||
-           (saw_lbutton_down && roll->last_index != pitch)) &&
-          !saw_voices[VOICE_COUNT - 1].enabled) {
-        for (i32 n = VOICE_COUNT - 1; n > 0; --n)
-          saw_voices[n] = saw_voices[n - 1];
-
-        saw_voices[0] = (saw_voice_t) {
-          .enabled       = 1,
-          .time          = 0,
-          .duration      = .6,
-          .frequency     = saw_pitch_frequency(pitch),
-          .amplitude     = saw_pitch_amplitude(pitch),
-          .stereo_factor = saw_random(-0.01, 0.01),
-        };
-      }
+           (saw_lbutton_down && roll->last_index != pitch)))
+        saw_play_voice(saw_tracks + roll->track, roll, pitch, 2);
 
       if (saw_rbutton_click)
-        roll->turned_off[pitch] = !roll->turned_off[pitch];
+        roll->pitch_turned_off[pitch] =
+            !roll->pitch_turned_off[pitch];
 
       roll->last_index = pitch;
     }
@@ -806,7 +935,7 @@ static void saw_ui_roll(saw_roll_t *roll, i64 x0, i64 y0, i64 width,
   //  Draw music sheet
   //
 
-  for (i32 pitch = 0; pitch < ROLL_SIZE; pitch++) {
+  for (i32 pitch = 0; pitch < PITCH_COUNT; pitch++) {
     i32 y = frame_height - y0 - (pitch + 1) * pianokey_height +
             roll->offset_y;
 
@@ -852,7 +981,7 @@ static void saw_ui_roll(saw_roll_t *roll, i64 x0, i64 y0, i64 width,
                         saw_mouse_x < x + w && saw_mouse_y >= y &&
                         saw_mouse_y < y + h;
 
-        nvgFillColor(saw_nvg, roll->turned_off[pitch]
+        nvgFillColor(saw_nvg, roll->pitch_turned_off[pitch]
                                   ? nvgRGBA(160, 150, 120, 100)
                               : has_cursor
                                   ? nvgRGBA(180, 180, 220, 160)
@@ -862,7 +991,7 @@ static void saw_ui_roll(saw_roll_t *roll, i64 x0, i64 y0, i64 width,
         //  Empty cell input
         //
 
-        if (!roll->grid_input && !roll->turned_off[pitch] &&
+        if (!roll->grid_input && !roll->pitch_turned_off[pitch] &&
             has_cursor && saw_lbutton_click) {
           for (i32 n = 0; n < SHEET_SIZE; n++)
             if (!roll->notes[n].enabled) {
@@ -1058,21 +1187,21 @@ static void saw_init(void) {
     saw_compose.rolls[i] = (i == 0 ? 0 : -1);
 
     saw_rolls[i] = (saw_roll_t) {
-      .enabled        = (i == 0),
-      .track          = 0,
-      .last_index     = -1,
-      .turned_off     = { 0 },
-      .rate           = 6,
-      .notes          = { 0 },
-      .frame          = 0,
-      .size           = 48,
-      .grid_input     = 0,
-      .grid_note      = 0,
-      .grid_time      = 0,
-      .offset_x_input = 0,
-      .offset_y_input = 0,
-      .offset_x       = 0,
-      .offset_y       = ROLL_DEFAULT_OFFSET_Y,
+      .enabled          = (i == 0),
+      .track            = 0,
+      .last_index       = -1,
+      .pitch_turned_off = { 0 },
+      .rate             = 6,
+      .notes            = { 0 },
+      .frame            = 0,
+      .size             = 48,
+      .grid_input       = 0,
+      .grid_note        = 0,
+      .grid_time        = 0,
+      .offset_x_input   = 0,
+      .offset_y_input   = 0,
+      .offset_x         = 0,
+      .offset_y         = ROLL_DEFAULT_OFFSET_Y,
     };
   }
 
@@ -1081,14 +1210,17 @@ static void saw_init(void) {
       .instrument   = INSTRUMENT_SINE,
       .warp         = .5,
       .phase        = .0,
+      .unison       = 1,
+      .spread       = .1,
       .stereo_width = .2,
-      .volume       = .2,
+      .volume       = 1.,
       .envelope     = {
         .sustain    = .15,
         .attack     = .007,
         .decay      = .3,
         .release    = .4,
       },
+      .value_input  = TRACK_INPUT_NONE,
     };
 }
 
@@ -1097,7 +1229,7 @@ static void saw_frame(void) {
   i32 frame_height = sapp_height();
 
   glViewport(0, 0, frame_width, frame_height);
-  glClearColor(.23f, .19f, .16f, 1.f);
+  glClearColor(.15f, .12f, .10f, 1.f);
   glClearDepth(1.);
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT |
           GL_STENCIL_BUFFER_BIT);
@@ -1169,6 +1301,107 @@ static void saw_event(sapp_event const *event) {
         saw_compose.offset_y += event->mouse_dy;
       }
 
+      if (saw_current_track != -1) {
+        saw_track_t *track = saw_tracks + saw_current_track;
+
+        track->value_buffer -= (event->modifiers &
+                                SAPP_MODIFIER_SHIFT)
+                                   ? event->mouse_dy * 300
+                               : (event->modifiers &
+                                  SAPP_MODIFIER_CTRL)
+                                   ? event->mouse_dy
+                                   : event->mouse_dy * 20;
+
+        switch (track->value_input) {
+          case TRACK_INPUT_INSTRUMENT:
+            //  TODO
+            //
+            break;
+
+          case TRACK_INPUT_WARP:
+            track->warp = track->value_buffer * .0001;
+            if (track->warp < -1.)
+              track->warp = -1.;
+            if (track->warp > 1.)
+              track->warp = 1.;
+            break;
+
+          case TRACK_INPUT_PHASE:
+            track->value_buffer = (f64) ((i64) track->value_buffer %
+                                         10000);
+            while (track->value_buffer < 0)
+              track->value_buffer += 10000;
+            track->phase = track->value_buffer * .0001;
+            break;
+
+          case TRACK_INPUT_UNISON:
+            track->unison = (i64) (track->value_buffer * .01 + 0.5);
+            if (track->unison < 1)
+              track->unison = 1;
+            if (track->unison > UNISON_COUNT)
+              track->unison = UNISON_COUNT;
+            break;
+
+          case TRACK_INPUT_SPREAD:
+            track->spread = track->value_buffer * .0001;
+            if (track->spread < 0.)
+              track->spread = 0.;
+            if (track->spread > 1.)
+              track->spread = 1.;
+            break;
+
+          case TRACK_INPUT_STEREO_WIDTH:
+            track->stereo_width = track->value_buffer * .0001;
+            if (track->stereo_width < 0.)
+              track->stereo_width = 0.;
+            if (track->stereo_width > 2.)
+              track->stereo_width = 2.;
+            break;
+
+          case TRACK_INPUT_VOLUME:
+            track->volume = track->value_buffer * .0001;
+            if (track->volume < 0.)
+              track->volume = 0.;
+            if (track->volume > 2.)
+              track->volume = 2.;
+            break;
+
+          case TRACK_INPUT_SUSTAIN:
+            track->envelope.sustain = track->value_buffer * .0001;
+            if (track->envelope.sustain < 0.)
+              track->envelope.sustain = 0.;
+            if (track->envelope.sustain > 1.)
+              track->envelope.sustain = 1.;
+            break;
+
+          case TRACK_INPUT_ATTACK:
+            track->envelope.attack = track->value_buffer * .00001;
+            if (track->envelope.attack < 0.)
+              track->envelope.attack = 0.;
+            if (track->envelope.attack > 60.)
+              track->envelope.attack = 60.;
+            break;
+
+          case TRACK_INPUT_DECAY:
+            track->envelope.decay = track->value_buffer * .00001;
+            if (track->envelope.decay < 0.)
+              track->envelope.decay = 0.;
+            if (track->envelope.decay > 60.)
+              track->envelope.decay = 60.;
+            break;
+
+          case TRACK_INPUT_RELEASE:
+            track->envelope.release = track->value_buffer * .00001;
+            if (track->envelope.release < 0.)
+              track->envelope.release = 0.;
+            if (track->envelope.release > 60.)
+              track->envelope.release = 60.;
+            break;
+
+          default:;
+        }
+      }
+
       break;
 
     case SAPP_EVENTTYPE_MOUSE_DOWN:
@@ -1218,6 +1451,7 @@ static void saw_event(sapp_event const *event) {
             saw_compose.offset_y = 0;
 
             break;
+
           default:;
         }
       }
@@ -1232,11 +1466,32 @@ char const *__lsan_default_suppressions() {
   return "leak:nvidia";
 }
 
-sapp_desc sokol_main(int argc, char **argv) {
-  static char title[] = "saw";
+sapp_desc sokol_main(i32 argc, char **argv) {
+  i8 print_version = 0;
+
+  for (i32 i = 0; i < argc; i++)
+    if (strcmp(argv[i], "--version") == 0)
+      print_version = 1;
+    else if (i > 0)
+      printf("Unknown command line argument: \"%s\"\n", argv[i]);
+
+  if (print_version) {
+    printf("saw %d.%d.%d"
+#if SAW_VERSION_DEV
+           "_dev"
+#endif
+#ifndef NDEBUG
+           " (Debug)"
+#endif
+           " - Music sequencer standalone application.\n",
+           SAW_VERSION_MAJOR, SAW_VERSION_MINOR, SAW_VERSION_BABY);
+    exit(0);
+  }
+
+  fflush(stdout);
 
   return (sapp_desc) {
-    .window_title = title,
+    .window_title = "saw",
     .width        = 1280,
     .height       = 720,
     .init_cb      = saw_init,