Probably should not fetch screen refresh rate in the loop, for now.

handmade.c

@@ -11,7 +11,7 @@ static void GameOutputSound(game_state *GameState,
     S16 ToneVolume, *SampleOut;
     S32 WavePeriod, SampleIndex;
 
-    ToneVolume = 8000;
+    ToneVolume = 0;
     WavePeriod = SoundBuffer->SamplesPerSecond / ToneHz;
 
     SampleOut = SoundBuffer->Samples;

sdl_handmade.c

@@ -805,11 +805,18 @@ S32 main(S32 argc, char *argv[])
                 game_input Input[2];
                 game_input *NewInput, *OldInput;
                 sdl_game_code Game;
+                F32 TargetSecondsPerFrame;
+                S32 MonitorRefreshHz, GameUpdateHz;
 
                 U64 LastCounter;
 #if __x86_64__ || __i386__
                 U64 LastCycleCount;
 #endif
+
+                MonitorRefreshHz = SDLGetWindowRefreshRate(Window);
+                GameUpdateHz = MonitorRefreshHz;
+                TargetSecondsPerFrame = 1.0f / (F32)GameUpdateHz;
+
                 NewInput = &Input[0];
                 OldInput = &Input[1];
                 memset(&Input, 0, sizeof(Input));
@@ -820,8 +827,6 @@ S32 main(S32 argc, char *argv[])
 
                 while(GlobalRunning) {
                     thread_context Context;
-                    S32 MonitorRefreshHz, GameUpdateHz;
-                    F32 TargetSecondsPerFrame;
                     U32 NewDLLWriteTime, ButtonIndex, ControllerIndex,
                         SDLMouseButtons;
                     game_controller_input *OldKeyboardController,
@@ -849,10 +854,6 @@ S32 main(S32 argc, char *argv[])
                     LastCycleCount = __rdtsc(); 
 #endif
 
-                    MonitorRefreshHz = SDLGetWindowRefreshRate(Window);
-                    GameUpdateHz = MonitorRefreshHz;
-                    TargetSecondsPerFrame = 1.0f / (F32)GameUpdateHz;
-
                     NewDLLWriteTime = GetLastWriteTime(SDLState.DLLPath);
                     if(NewDLLWriteTime > Game.DLLLastWriteTime) {
                         SDLUnloadGameCode(&Game);
@@ -1074,10 +1075,11 @@ S32 main(S32 argc, char *argv[])
                         SDLPlaybackInput(&SDLState, NewInput);
                     }
 
-                    if(Game.UpdateAndRender)
+                    if(Game.UpdateAndRender) {
                         Game.UpdateAndRender(&Context, &GameMemory,
                                              NewInput, &Buffer,
                                              &SoundBuffer);
+                    }
 
                     SDLFillSoundBuffer(&SoundOutput, BytesToWrite);