From 5873c787c631612554d6c2daeb6db08c5306fb0c Mon Sep 17 00:00:00 2001
From: Mitya Selivanov <automainint@guattari.tech>
Date: Mon, 12 Feb 2024 22:59:01 +0100
Subject: Properly resume audio after a use action in browser

---
 source/saw/main.c | 75 +++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 53 insertions(+), 22 deletions(-)

(limited to 'source')

diff --git a/source/saw/main.c b/source/saw/main.c
index bdbb5ad..9b480f1 100644
--- a/source/saw/main.c
+++ b/source/saw/main.c
@@ -928,7 +928,7 @@ static void saw_ui_track(saw_track_t *track, i64 x0, i64 y0,
                          i64 width, i64 height, str_t title) {
   i64 frame_height = sapp_height();
 
-  i64 text_height   = 35;
+  i64 text_height   = 33;
   i64 header_offset = 60;
   i64 border        = 2;
   i64 column_width  = 200;
@@ -1042,7 +1042,7 @@ static void saw_ui_track(saw_track_t *track, i64 x0, i64 y0,
   //
 
   nvgBeginPath(saw_nvg);
-  nvgFontSize(saw_nvg, text_height);
+  nvgFontSize(saw_nvg, text_height - border);
   nvgFontFaceId(saw_nvg, saw_font_text);
   nvgFillColor(saw_nvg, nvgRGBA(255, 255, 255, 255));
 
@@ -1608,6 +1608,26 @@ static void saw_ui_roll(saw_roll_t *roll, i64 x0, i64 y0, i64 width,
 //
 //  ================================================================
 
+static void saw_init_audio(void) {
+  ma_device_config config = ma_device_config_init(
+      ma_device_type_playback);
+
+  config.playback.format   = ma_format_f32;
+  config.playback.channels = CHANNEL_COUNT;
+  config.sampleRate        = SAMPLE_RATE;
+  config.dataCallback      = saw_audio;
+  config.pUserData         = NULL;
+
+  if (ma_device_init(NULL, &config, &saw_audio_device) !=
+      MA_SUCCESS) {
+    printf("ma_device_init failed.\n");
+    fflush(stdout);
+    return;
+  }
+
+  ma_device_start(&saw_audio_device);
+}
+
 static void saw_init(void) {
   //  Init RNG
   //
@@ -1629,22 +1649,9 @@ static void saw_init(void) {
   //  Init miniaudio
   //
 
-  ma_device_config config = ma_device_config_init(
-      ma_device_type_playback);
-
-  config.playback.format   = ma_format_f32;
-  config.playback.channels = CHANNEL_COUNT;
-  config.sampleRate        = SAMPLE_RATE;
-  config.dataCallback      = saw_audio;
-  config.pUserData         = NULL;
-
-  if (ma_device_init(NULL, &config, &saw_audio_device) !=
-      MA_SUCCESS) {
-    printf("ma_device_init failed.\n");
-    return;
-  }
-
-  ma_device_start(&saw_audio_device);
+#ifndef __EMSCRIPTEN__
+  saw_init_audio();
+#endif
 
   //  Load fonts
   //
@@ -1652,14 +1659,18 @@ static void saw_init(void) {
   saw_font_text = nvgCreateFontMem(saw_nvg, "", (u8 *) saw_ttf_text,
                                    SAW_TTF_TEXT_SIZE, 0);
 
-  if (saw_font_text == -1)
+  if (saw_font_text == -1) {
     printf("nvgCreateFontMem failed.\n");
+    fflush(stdout);
+  }
 
   saw_font_icons = nvgCreateFontMem(saw_nvg, "", (u8 *) saw_ttf_icons,
                                     SAW_TTF_ICONS_SIZE, 0);
 
-  if (saw_font_icons == -1)
+  if (saw_font_icons == -1) {
     printf("nvgCreateFontMem failed.\n");
+    fflush(stdout);
+  }
 
   //  Init Saw state
   //
@@ -1721,10 +1732,11 @@ static void saw_init(void) {
 
     s32 s = folder_create_recursive(WRAP_STR(cache));
 
-    if (s != KIT_OK)
+    if (s != KIT_OK) {
       printf("Failed to create cache folder: %s\n (code %d)",
              BS(cache), (i32) s);
-    else {
+      fflush(stdout);
+    } else {
       memcpy(saw_project_file_buf, cache.values, cache.size);
       saw_project_file_buf[cache.size] = PATH_DELIM_C;
       memcpy(saw_project_file_buf + cache.size + 1, "last", 5);
@@ -1735,6 +1747,7 @@ static void saw_init(void) {
   }
 
   printf("Project file: %s\n", BS(saw_project_file));
+  fflush(stdout);
 
   //  Load the project from a file
   //
@@ -1744,6 +1757,7 @@ static void saw_init(void) {
 
     if (f == NULL) {
       printf("Failed to read file: %s\n", BS(saw_project_file));
+      fflush(stdout);
       return;
     }
 
@@ -1751,6 +1765,7 @@ static void saw_init(void) {
   do {                                               \
     if (fscanf(f, format_, __VA_ARGS__) != num_) {   \
       printf("Invalid syntax at \"%s\"\n", format_); \
+      fflush(stdout);                                \
       fclose(f);                                     \
       return;                                        \
     }                                                \
@@ -1761,6 +1776,7 @@ static void saw_init(void) {
 
     if (total_rolls < 0 || total_rolls > ROLL_COUNT) {
       printf("Invalid roll count: %d\n", total_rolls);
+      fflush(stdout);
       fclose(f);
       return;
     }
@@ -1784,6 +1800,7 @@ static void saw_init(void) {
 
       if (pitch_count < 0 || pitch_count > PITCH_COUNT) {
         printf("Invalid pitch count: %d\n", pitch_count);
+        fflush(stdout);
         fclose(f);
         return;
       }
@@ -1801,6 +1818,7 @@ static void saw_init(void) {
 
       if (sheet_size < 0 || sheet_size > SHEET_SIZE) {
         printf("Invalid note count: %d\n", sheet_size);
+        fflush(stdout);
         fclose(f);
         return;
       }
@@ -2117,11 +2135,13 @@ static void saw_cleanup(void) {
     return;
 
   printf("Save project: %s\n", BS(saw_project_file));
+  fflush(stdout);
 
   FILE *f = fopen(BS(saw_project_file), "wb");
 
   if (f == NULL) {
     printf("Failed to write file: %s\n", BS(saw_project_file));
+    fflush(stdout);
     return;
   }
 
@@ -2207,6 +2227,17 @@ static void saw_cleanup(void) {
 }
 
 static void saw_event(sapp_event const *event) {
+#ifdef __EMSCRIPTEN__
+  //  In browser, resume the audio only after a user action.
+  static b8 is_audio_suspended = 1;
+  if (is_audio_suspended &&
+      (event->type == SAPP_EVENTTYPE_MOUSE_DOWN ||
+       event->type == SAPP_EVENTTYPE_TOUCHES_BEGAN)) {
+    saw_init_audio();
+    is_audio_suspended = 0;
+  }
+#endif
+
   switch (event->type) {
     case SAPP_EVENTTYPE_MOUSE_MOVE:
       saw_shift_on = (event->modifiers & SAPP_MODIFIER_SHIFT) != 0;
-- 
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