Drag & drop in web browser

1 files changed, 180 insertions, 68 deletions

diff --git a/source/saw/main.c b/source/saw/main.c
index 4f4d2ae..721eb76 100644
--- a/source/saw/main.c
+++ b/source/saw/main.c
@@ -58,11 +58,9 @@
 
 enum {
   //  TODO
-  //
-  //  Use 28224000 for time rate, divisible by common sample rates
-  //  like 192000, 44100 etc.
-  //
-  //  Dynamic buffer size.
+  //  - Use 28224000 for time rate, divisible by common sample rates
+  //    like 192000, 44100 etc.
+  //  - Dynamic buffer size.
 
   CHANNEL_COUNT = 2,
   SAMPLE_RATE   = 44100,
@@ -193,6 +191,7 @@ typedef struct {
   saw_envelope_t envelope;
 } saw_oscillator_t;
 
+typedef DA(u8) saw_da_u8_t;
 typedef DA(f32) saw_da_f32_t;
 
 typedef struct {
@@ -239,49 +238,71 @@ typedef struct {
 //
 //      Global state
 //
+//    NOTE
+//    At some point we want to move all global data into a struct
+//    saw_context_t.
+//
 //  ================================================================
 
+//  Graphics
+//
+
 static struct NVGcontext *saw_nvg;
-static ma_device          saw_audio_device;
+static i32                saw_font_text  = -1;
+static i32                saw_font_icons = -1;
+
+//  Audio
+//
+
+static ma_device saw_audio_device;
 
 //  Input events
 //
 
-static i64  saw_mouse_x          = 0;
-static i64  saw_mouse_y          = 0;
-static i64  saw_mouse_dx         = 0;
-static i64  saw_mouse_dy         = 0;
-static b8   saw_lbutton_click    = 0;
-static b8   saw_lbutton_down     = 0;
-static b8   saw_rbutton_click    = 0;
-static b8   saw_rbutton_down     = 0;
-static b8   saw_mbutton_click    = 0;
-static b8   saw_mbutton_down     = 0;
-static b8   saw_mouse_on         = 0;
-static b8   saw_shift_on         = 0;
-static b8   saw_ctrl_on          = 0;
-static b8   saw_key_pressed[512] = { 0 };
-static char saw_drop_file[4096]  = { 0 };
-
-static b8    saw_playback_on                  = 0;
-static i64   saw_playback_frame               = 0;
-static i64   saw_playback_lookahead           = 0;
-static i64   saw_playback_offset_read         = 0;
-static i64   saw_playback_offset_write        = 0;
-static f32   saw_playback_buffer[BUFFER_SIZE] = { 0.f };
-static f32   saw_playback_temp[BUFFER_SIZE];
+static i64 saw_mouse_x       = 0;
+static i64 saw_mouse_y       = 0;
+static i64 saw_mouse_dx      = 0;
+static i64 saw_mouse_dy      = 0;
+static b8  saw_lbutton_click = 0;
+static b8  saw_lbutton_down  = 0;
+static b8  saw_rbutton_click = 0;
+static b8  saw_rbutton_down  = 0;
+static b8  saw_mbutton_click = 0;
+static b8  saw_mbutton_down  = 0;
+static b8  saw_mouse_on      = 0;
+static b8  saw_shift_on      = 0;
+static b8  saw_ctrl_on       = 0;
+
+//  Playback
+//
+
+static b8    saw_playback_on           = 0;
+static i64   saw_playback_frame        = 0;
+static i64   saw_playback_lookahead    = 0;
+static i64   saw_playback_offset_read  = 0;
+static i64   saw_playback_offset_write = 0;
 static mtx_t saw_playback_mutex;
 
-static i64 saw_current_track = 0;
-static i64 saw_current_roll  = 0;
-static i64 saw_edit_mode     = EDIT_MODE_HAND;
+//  Buffers
+//
+
+static f32         saw_playback_buffer[BUFFER_SIZE];
+static f32         saw_playback_temp[BUFFER_SIZE];
+static b8          saw_key_pressed[512];
+static c8          saw_drop_file_name[4096];
+static saw_da_u8_t saw_drop_file_data;
+
+//  Project state
+//
 
-static char         saw_project_file_buf[4096];
-static str_t        saw_project_file;
-static i32          saw_font_text  = -1;
-static i32          saw_font_icons = -1;
+static i64          saw_current_track = 0;
+static i64          saw_current_roll  = 0;
+static i64          saw_edit_mode     = EDIT_MODE_HAND;
 static mt64_state_t saw_rng_mt64;
 
+static c8    saw_project_file_buf[4096];
+static str_t saw_project_file;
+
 static saw_voice_t saw_voices[VOICE_COUNT] = { 0 };
 static saw_roll_t  saw_rolls[ROLL_COUNT];
 static saw_track_t saw_tracks[TRACK_COUNT];
@@ -326,6 +347,10 @@ static f64 saw_ui_input_buffer = 0.;
 //
 //      Sound
 //
+//    NOTE
+//    When music and signal processing procedures become stable enough
+//    we will separate them into a library and add tests.
+//
 //  ================================================================
 
 #ifdef __GNUC__
@@ -869,6 +894,9 @@ static void saw_sampler_cleanup(saw_sampler_t *sampler) {
 //
 //      UI
 //
+//    TODO
+//    - UI library and tests.
+//
 //  ================================================================
 
 static void saw_ui_begin(void) {
@@ -1782,7 +1810,7 @@ static void saw_ui_sampler(saw_sampler_t *sampler, i64 x0, i64 y0,
   i64 w             = (width * 5) / 6;
   i64 sample_height = text_height * 4;
 
-  if (saw_drop_file[0] != '\0') {
+  if (saw_drop_file_data.size != 0) {
     //  Load the audio sample from a file
     //
 
@@ -1790,8 +1818,9 @@ static void saw_ui_sampler(saw_sampler_t *sampler, i64 x0, i64 y0,
     u32          sample_rate;
     drwav_uint64 count;
 
-    f32 *samples = drwav_open_file_and_read_pcm_frames_f32(
-        saw_drop_file, &channels, &sample_rate, &count, NULL);
+    f32 *samples = drwav_open_memory_and_read_pcm_frames_f32(
+        saw_drop_file_data.values, saw_drop_file_data.size, &channels,
+        &sample_rate, &count, NULL);
 
     if (samples == NULL) {
       printf("drwav_open_file_and_read_pcm_frames_f32 failed.\n");
@@ -1856,12 +1885,7 @@ static void saw_ui_sampler(saw_sampler_t *sampler, i64 x0, i64 y0,
     nvgTextAlign(saw_nvg, NVG_ALIGN_CENTER | NVG_ALIGN_MIDDLE);
     nvgText(saw_nvg, x0 + width / 2,
             frame_height - y0 - height + sample_height / 2,
-#ifdef __EMSCRIPTEN__
-            "Not implemented for the web yet",
-#else
-            "Drop a WAV file here",
-#endif
-            NULL);
+            "Drop a WAV file here", NULL);
   }
 
   saw_ui_value_float(x, y0 + height - sample_height - text_height, w,
@@ -2509,6 +2533,15 @@ static void saw_init_audio(void) {
 }
 
 static void saw_init(void) {
+  //  Init globals
+  //
+
+  memset(saw_key_pressed, 0, sizeof saw_key_pressed);
+  memset(saw_drop_file_name, 0, sizeof saw_drop_file_name);
+  memset(&saw_drop_file_data, 0, sizeof saw_drop_file_data);
+  memset(saw_playback_buffer, 0, sizeof saw_playback_buffer);
+  memset(saw_playback_temp, 0, sizeof saw_playback_temp);
+
   //  Init RNG
   //
 
@@ -2868,8 +2901,8 @@ static void saw_init(void) {
 
 static void saw_frame(void) {
   //  TODO
-  //  Check how much time passed to see if we need to adjust the
-  //  buffer size.
+  //  - Check how much time passed to see if we need to adjust the
+  //    buffer size.
 
   (void) saw_ui_value_int;
 
@@ -3002,7 +3035,11 @@ static void saw_frame(void) {
     saw_ctrl_on       = 0;
 
     memset(saw_key_pressed, 0, sizeof saw_key_pressed);
-    memset(saw_drop_file, 0, sizeof saw_drop_file);
+
+    if (saw_drop_file_data.size != 0) {
+      memset(saw_drop_file_name, 0, sizeof saw_drop_file_name);
+      DA_DESTROY(saw_drop_file_data);
+    }
   }
 }
 
@@ -3167,6 +3204,23 @@ static void saw_cleanup(void) {
       saw_sampler_cleanup(&saw_tracks[i].sampler);
 }
 
+#ifdef __EMSCRIPTEN__
+static void saw_fetch_drop(
+    sapp_html5_fetch_response const *response) {
+  assert(response != NULL);
+
+  if (response == NULL || !response->succeeded) {
+    printf("Unable to fetch the dropped file\n");
+    fflush(stdout);
+    return;
+  }
+
+  assert(saw_drop_file_data.size >= response->data.size);
+
+  DA_RESIZE(saw_drop_file_data, response->data.size);
+}
+#endif
+
 static void saw_event(sapp_event const *event) {
 #ifdef __EMSCRIPTEN__
   //  In browser, resume the audio only after a user action.
@@ -3289,20 +3343,80 @@ static void saw_event(sapp_event const *event) {
       break;
 
     case SAPP_EVENTTYPE_FILES_DROPPED: {
+      //  Get the dropped file name
+      //
+
+      i32 drop_count = sapp_get_num_dropped_files();
+      if (drop_count <= 0)
+        break;
+
+      c8 const *file_name = sapp_get_dropped_file_path(0);
+
+      i64 len = strlen(file_name);
+
+      assert(len > 0);
+      if (len <= 0)
+        break;
+
+      if (len >= sizeof saw_drop_file_name)
+        len = sizeof saw_drop_file_name - 1;
+
+      memcpy(saw_drop_file_name, file_name, len);
+      saw_drop_file_name[len] = '\0';
+
+      //  Read the file data into the buffer
+      //
+
 #ifdef __EMSCRIPTEN__
-      (void) saw_drop_file;
+      i64 size = sapp_html5_get_dropped_file_size(0);
 #else
-      i32 n = sapp_get_num_dropped_files();
+      i64 size = file_info(str(len, file_name)).size;
+#endif
 
-      if (n > 0) {
-        char const *file_name = sapp_get_dropped_file_path(0);
-        i64 len = strlen(file_name);
+      assert(size > 0);
+      if (size <= 0)
+        break;
 
-        if (len > 0 && len < sizeof saw_drop_file) {
-          memcpy(saw_drop_file, file_name, len);
-          saw_drop_file[len] = '\0';
-        }
+      if (saw_drop_file_data.size > 0)
+        DA_DESTROY(saw_drop_file_data);
+
+      DA_INIT(saw_drop_file_data, size, NULL);
+
+      assert(saw_drop_file_data.size == size);
+      if (saw_drop_file_data.size != size) {
+        printf("Bad alloc.\n");
+        fflush(stdout);
+        break;
       }
+
+#ifdef __EMSCRIPTEN__
+      sapp_html5_fetch_dropped_file(&(sapp_html5_fetch_request) {
+          .dropped_file_index = 0,
+          .callback           = saw_fetch_drop,
+          .buffer             = { .ptr  = saw_drop_file_data.values,
+                                  .size = size },
+      });
+#else
+      FILE *f = fopen(file_name, "rb");
+
+      assert(f != NULL);
+      if (f == NULL) {
+        printf("Unable to open file `%s`\n", file_name);
+        fflush(stdout);
+        break;
+      }
+
+      size = fread(saw_drop_file_data.values, 1, size, f);
+      fclose(f);
+
+      assert(size > 0);
+      if (size <= 0) {
+        printf("Unable to read file `%s`\n", file_name);
+        fflush(stdout);
+        break;
+      }
+
+      DA_RESIZE(saw_drop_file_data, size);
 #endif
     } break;
 
@@ -3368,17 +3482,15 @@ sapp_desc sokol_main(i32 argc, char **argv) {
     exit(0);
 
   return (sapp_desc) {
-    .window_title = "Saw",
-    .width        = 1280,
-    .height       = 720,
-#ifndef __EMSCRIPTEN__
+    .window_title                 = "Saw",
+    .width                        = 1280,
+    .height                       = 720,
     .enable_dragndrop             = 1,
-    .max_dropped_file_path_length = sizeof saw_drop_file,
-#endif
-    .init_cb     = saw_init,
-    .frame_cb    = saw_frame,
-    .cleanup_cb  = saw_cleanup,
-    .event_cb    = saw_event,
-    .logger.func = log_,
+    .max_dropped_file_path_length = sizeof saw_drop_file_name,
+    .init_cb                      = saw_init,
+    .frame_cb                     = saw_frame,
+    .cleanup_cb                   = saw_cleanup,
+    .event_cb                     = saw_event,
+    .logger.func                  = log_,
   };
 }