begin macos port

src/main.cpp

@@ -1,5 +1,8 @@
 // Unity build - include all src files here
 // -mta
+#ifdef __APPLE__
+#include <mach/mach_time.h>
+#endif
 // [h]
 #include "base/base_inc.h"
 #include "platform/platform.h"
@@ -14,10 +17,17 @@
 #include "base/base_inc.cpp"
 #include "ui/ui_core.cpp"
 #include "ui/ui_widgets.cpp"
+#ifdef __APPLE__
+#include "platform/platform_macos.mm"
+#include "renderer/renderer_metal.mm"
+#include "midi/midi_coremidi.cpp"
+#include "audio/audio_coreaudio.cpp"
+#else
 #include "platform/platform_win32.cpp"
 #include "renderer/renderer_dx12.cpp"
 #include "midi/midi_win32.cpp"
 #include "audio/audio_asio.cpp"
+#endif
 #include "menus.cpp"
 
 ////////////////////////////////
@@ -58,8 +68,14 @@ struct AppState {
     B32             show_props;
     B32             show_log;
     B32             show_midi_devices;
+#ifdef __APPLE__
+    uint64_t        freq_numer;
+    uint64_t        freq_denom;
+    uint64_t        last_time;
+#else
     LARGE_INTEGER   freq;
     LARGE_INTEGER   last_time;
+#endif
 
     // Tab state
     S32             right_panel_tab;  // 0 = Properties, 1 = MIDI Devices
@@ -643,10 +659,16 @@ static void build_ui(AppState *app) {
 
 static void do_frame(AppState *app) {
     // Timing
+#ifdef __APPLE__
+    uint64_t now = mach_absolute_time();
+    F32 dt = (F32)(now - app->last_time) * (F32)app->freq_numer / ((F32)app->freq_denom * 1e9f);
+    app->last_time = now;
+#else
     LARGE_INTEGER now;
     QueryPerformanceCounter(&now);
     F32 dt = (F32)(now.QuadPart - app->last_time.QuadPart) / (F32)app->freq.QuadPart;
     app->last_time = now;
+#endif
     if (dt > 0.1f) dt = 0.1f;
 
     // Resize
@@ -737,9 +759,15 @@ int main(int argc, char **argv) {
     app.show_midi_devices = 1;
     app.demo_dropdown_sel = 1; // default to 48000 Hz
     snprintf(app.demo_text_a, sizeof(app.demo_text_a), "My Instrument");
+#ifdef __APPLE__
+    snprintf(app.demo_text_b, sizeof(app.demo_text_b), "~/Samples/output");
+    { mach_timebase_info_data_t tbi; mach_timebase_info(&tbi); app.freq_numer = tbi.numer; app.freq_denom = tbi.denom; }
+    app.last_time = mach_absolute_time();
+#else
     snprintf(app.demo_text_b, sizeof(app.demo_text_b), "C:\\Samples\\output");
     QueryPerformanceFrequency(&app.freq);
     QueryPerformanceCounter(&app.last_time);
+#endif
 
     platform_set_frame_callback(window, frame_callback, &app);