int CALLBACK WinMain( HINSTANCE hInstance, HINSTANCE, LPSTR, int ) {
LARGE_INTEGER performanceFrequencyResult;
QueryPerformanceFrequency( &performanceFrequencyResult );
performanceFrequency = performanceFrequencyResult.QuadPart;
win32State_t *state = &win32State;
Win32GetExeFileName( state );
char gameDllFullPath[ 256 ];
Win32BuildExePathFileName( state, "tiny.dll", sizeof( gameDllFullPath ), gameDllFullPath );
char tempGameDllFullPath[ 256 ];
Win32BuildExePathFileName( state, "tiny_temp.dll", sizeof( tempGameDllFullPath ), tempGameDllFullPath );
UINT desiredSchedulerMs = 1;
b32 sleepIsGranular = ( timeBeginPeriod( desiredSchedulerMs ) == TIMERR_NOERROR );
WNDCLASSA wndClass = { 0 };
wndClass.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
wndClass.lpfnWndProc = WindowProc;
wndClass.hInstance = hInstance;
wndClass.lpszClassName = "tinyrenderer";
if ( !RegisterClassA( &wndClass ) ) {
printf( "Failed RegisterClass()\n" );
return 1;
}
HWND hWnd = CreateWindow(
wndClass.lpszClassName, "Tiny Renderer",
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
CW_USEDEFAULT, CW_USEDEFAULT,
WINDOW_WIDTH, WINDOW_HEIGHT,
0, 0, 0, 0 );
if ( !hWnd ) {
printf( "Failed CreateWindowA()\n" );
return 1;
}
Win32_ResizeDibSection( &backBuffer, RENDER_WIDTH, RENDER_HEIGHT );
int monitorRefreshHz = 60;
HDC refreshDC = GetDC( hWnd );
int win32RefreshRate = GetDeviceCaps( refreshDC, VREFRESH );
if ( win32RefreshRate > 1 ) {
monitorRefreshHz = win32RefreshRate;
}
float gameUpdateHz = ( monitorRefreshHz / 2.0f );
float targetMsPerFrame = 1000.0f * ( 1.0f / ( float ) gameUpdateHz );
LARGE_INTEGER lastCounter = Win32GetWallClock( );
LARGE_INTEGER flipWallClock = Win32GetWallClock( );
win32GameCode_t game = Win32LoadGameCode( gameDllFullPath, tempGameDllFullPath );
//uint64_t lastCycleCount = __rdtsc();
running = true;
while ( running ) {
FILETIME dllWriteTime = Win32GetLastWriteTime( gameDllFullPath );
if ( CompareFileTime( &dllWriteTime, &game.lastWriteTime ) != 0 ) {
Win32UnloadGameCode( &game );
game = Win32LoadGameCode( gameDllFullPath, tempGameDllFullPath );
}
MSG msg = { 0 };
while ( PeekMessageA( &msg, hWnd, 0, 0, PM_REMOVE ) ) {
TranslateMessage( &msg );
DispatchMessageA( &msg );
}
if ( running ) {
gameBackBuffer_t gameBuffer = {};
gameBuffer.memory = backBuffer.memory;
gameBuffer.width = backBuffer.width;
gameBuffer.height = backBuffer.height;
gameBuffer.pitch = backBuffer.pitch;
// Render the things
if ( game.updateAndRender ) {
game.updateAndRender( &gameBuffer );
}
LARGE_INTEGER workCounter = Win32GetWallClock( );
float workMsElapsed = Win32GetMsElapsed( lastCounter, workCounter );
float msElapsedForFrame = workMsElapsed;
if ( msElapsedForFrame < targetMsPerFrame ) {
if ( sleepIsGranular ) {
DWORD sleepMs = ( DWORD ) ( targetMsPerFrame - msElapsedForFrame );
if ( sleepMs > 0 ) {
Sleep( sleepMs );
}
}
while ( msElapsedForFrame < targetMsPerFrame ) {
msElapsedForFrame = Win32GetMsElapsed( lastCounter, Win32GetWallClock( ) );
}
}
LARGE_INTEGER endCounter = Win32GetWallClock( );
float msPerFrame = Win32GetMsElapsed( lastCounter, endCounter );
lastCounter = endCounter;
char title[ 256 ];
sprintf_s( title, "%.2fms/f", msPerFrame );
SetWindowTextA( hWnd, title );
// Put the things on the screen
HDC dc = GetDC( hWnd );
RECT rect;
GetClientRect( hWnd, &rect );
int width = rect.right - rect.left;
int height = rect.bottom - rect.top;
Win32_AspectBlt( dc, &backBuffer, width, height );
ReleaseDC( hWnd, dc );
flipWallClock = Win32GetWallClock( );
}
}
return 0;
}
int CALLBACK WinMain(HINSTANCE Instance, HINSTANCE PrevInstance, LPSTR CommandLine, int ShowCode) {
win32_state Win32State = {};
LARGE_INTEGER PerfCounterFrequencyResult;
QueryPerformanceFrequency(&PerfCounterFrequencyResult);
GlobalPerfCounterFrequency = PerfCounterFrequencyResult.QuadPart;
Win32GetEXEFileName(&Win32State);
char SourceGameCodeDLLFullPath[WIN32_STATE_FILE_NAME_COUNT];
Win32BuildEXEPathFileName(&Win32State, "handmade.dll", sizeof(SourceGameCodeDLLFullPath), SourceGameCodeDLLFullPath);
char TempGameCodeDLLFullPath[WIN32_STATE_FILE_NAME_COUNT];
Win32BuildEXEPathFileName(&Win32State, "handmade_temp.dll", sizeof(TempGameCodeDLLFullPath), TempGameCodeDLLFullPath);
char GameCodeLockFullPath[WIN32_STATE_FILE_NAME_COUNT];
Win32BuildEXEPathFileName(&Win32State, "lock.tmp", sizeof(GameCodeLockFullPath), GameCodeLockFullPath);
// NOTE: setting windows scheduler granularity for our sleep() call
UINT DesiredSchedulerMS = 1;
bool32 SleepIsGranular = (timeBeginPeriod(DesiredSchedulerMS) == TIMERR_NOERROR);
Win32LoadXInput();
Win32ResizeDIBSection(&GlobalBackbuffer, 960, 540);
#if HANDMADE_INTERNAL
DEBUGGlobalShowCursor = true;
#endif
WNDCLASSEXA WindowClass = {};
WindowClass.style = CS_VREDRAW | CS_HREDRAW;
WindowClass.cbSize = sizeof(WNDCLASSEXA);
WindowClass.lpfnWndProc = Win32MainWindowCallback;
WindowClass.hInstance = Instance;
WindowClass.hCursor = LoadCursor(0, IDC_ARROW);
// WindowClass.hIcon;
WindowClass.lpszClassName = "HandmadeHeroWindowClass";
if (RegisterClassExA(&WindowClass)) {
// WS_EX_TOPMOST|WS_EX_LAYERED
HWND Window = CreateWindowExA(0, WindowClass.lpszClassName, "Handmade Hero", WS_OVERLAPPEDWINDOW | WS_VISIBLE, CW_USEDEFAULT, CW_USEDEFAULT, 996, 600, 0, 0, Instance, 0);
if (Window) {
// TODO: reliably query this from windows
int MonitorRefreshHz = 60;
HDC RefreshDC = GetDC(Window);
int Win32RefreshRate = GetDeviceCaps(RefreshDC, VREFRESH);
ReleaseDC(Window, RefreshDC);
if (Win32RefreshRate > 1) {
MonitorRefreshHz = Win32RefreshRate;
if (MonitorRefreshHz == 59) {
MonitorRefreshHz = 60;
}
}
real32 GameUpdateHz = MonitorRefreshHz / 2.0f;
real32 TargetSecondsPerFrame = 1.0f / GameUpdateHz;
// NOTE: sound test
win32_sound_output SoundOutput = {};
SoundOutput.SamplesPerSecond = 48000;
SoundOutput.BytesPerSample = sizeof(int16) * 2;
SoundOutput.SecondaryBufferSize = SoundOutput.SamplesPerSecond * SoundOutput.BytesPerSample;
// TODO: compute this variance and see what the lowest reasonable value is
SoundOutput.SafetyBytes = (int)((real32)SoundOutput.SamplesPerSecond * (real32)SoundOutput.BytesPerSample / GameUpdateHz / 3.0f);
Win32InitDSound(Window, SoundOutput.SamplesPerSecond, SoundOutput.SecondaryBufferSize);
Win32ClearSoundBuffer(&SoundOutput);
GlobalSecondaryBuffer->Play(0, 0, DSBPLAY_LOOPING);
GlobalRunning = true;
// TODO: pool with bitmap virtualalloc
int16 *Samples = (int16 *)VirtualAlloc(0, SoundOutput.SecondaryBufferSize, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
#if HANDMADE_INTERNAL
LPVOID BaseAddress = (LPVOID)Terabytes(2);
#else
LPVOID BaseAddress = 0;
#endif
game_memory GameMemory = {};
GameMemory.PermanentStorageSize = Megabytes(64);
GameMemory.TransientStorageSize = Gigabytes(1);
GameMemory.DEBUGPlatformFreeFileMemory = DEBUGPlatformFreeFileMemory;
GameMemory.DEBUGPlatformReadEntireFile = DEBUGPlatformReadEntireFile;
GameMemory.DEBUGPlatformWriteEntireFile = DEBUGPlatformWriteEntireFile;
// TODO: handle various memory footprints using system metrics
// TODO: use MEM_LARGE_PAGES
Win32State.TotalSize = GameMemory.PermanentStorageSize + GameMemory.TransientStorageSize;
Win32State.GameMemoryBlock = VirtualAlloc(BaseAddress, (size_t)Win32State.TotalSize, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
GameMemory.PermanentStorage = Win32State.GameMemoryBlock;
GameMemory.TransientStorage = (uint8 *)GameMemory.PermanentStorage + GameMemory.PermanentStorageSize;
for (int ReplayIndex = 1; ReplayIndex < ArrayCount(Win32State.ReplayBuffers); ++ReplayIndex) {
// TODO: recording system still takes too long on record start
win32_replay_buffer *ReplayBuffer = &Win32State.ReplayBuffers[ReplayIndex];
Win32GetInputFileLocation(&Win32State, false, ReplayIndex, sizeof(ReplayBuffer->FileName), ReplayBuffer->FileName);
ReplayBuffer->FileHandle = CreateFileA(ReplayBuffer->FileName, GENERIC_READ | GENERIC_WRITE, 0, 0, CREATE_ALWAYS, 0, 0);
LARGE_INTEGER MaxSize;
MaxSize.QuadPart = Win32State.TotalSize;
ReplayBuffer->MemoryMap = CreateFileMapping(ReplayBuffer->FileHandle, 0, PAGE_READWRITE, MaxSize.HighPart, MaxSize.LowPart, 0);
ReplayBuffer->MemoryBlock = MapViewOfFile(ReplayBuffer->MemoryMap, FILE_MAP_ALL_ACCESS, 0, 0, (size_t)Win32State.TotalSize);
if (!ReplayBuffer->MemoryBlock) {
// TODO: diagnostic
}
}
if (Samples && GameMemory.PermanentStorage && GameMemory.TransientStorage) {
game_input Input[2] = {};
game_input *NewInput = &Input[0];
game_input *OldInput = &Input[1];
LARGE_INTEGER LastCounter = Win32GetWallClock();
LARGE_INTEGER FlipWallClock = Win32GetWallClock();
int DebugTimeMarkerIndex = 0;
win32_debug_time_marker DebugTimeMarkers[30] = { 0 };
// TODO: handle startup specially
bool32 SoundIsValid = false;
DWORD AudioLatencyBytes = 0;
real32 AudioLatencySeconds = 0;
win32_game_code Game = Win32LoadGameCode(SourceGameCodeDLLFullPath, TempGameCodeDLLFullPath, GameCodeLockFullPath);
uint64 LastCycleCount = __rdtsc();
while (GlobalRunning) {
NewInput->FrameTimeDelta = TargetSecondsPerFrame;
FILETIME NewDLLWriteTime = Win32GetLastWriteTime(SourceGameCodeDLLFullPath);
if (CompareFileTime(&NewDLLWriteTime, &Game.DLLLastWriteTime) != 0) {
Win32UnloadGameCode(&Game);
Game = Win32LoadGameCode(SourceGameCodeDLLFullPath, TempGameCodeDLLFullPath, GameCodeLockFullPath);
}
// TODO: zeroing macro
// TODO: we cant zero everything as the up/down state will be wrong
game_controller_input *OldKeyboardController = GetController(OldInput, 0);
game_controller_input *NewKeyboardController = GetController(NewInput, 0);
*NewKeyboardController = {};
NewKeyboardController->IsConnected = true;
for (int ButtonIndex = 0; ButtonIndex < ArrayCount(NewKeyboardController->Buttons); ++ButtonIndex) {
NewKeyboardController->Buttons[ButtonIndex].EndedDown = OldKeyboardController->Buttons[ButtonIndex].EndedDown;
}
Win32ProcessPendingMessages(&Win32State, NewKeyboardController);
if (!GlobalPause) {
POINT MousePoint;
GetCursorPos(&MousePoint);
ScreenToClient(Window, &MousePoint);
NewInput->MouseX = MousePoint.x;
NewInput->MouseY = MousePoint.y;
NewInput->MouseZ = 0; // TODO: support mousewheel?
Win32ProcessKeyboardMessage(&NewInput->MouseButtons[0], GetKeyState(VK_LBUTTON) & (1 << 15));
Win32ProcessKeyboardMessage(&NewInput->MouseButtons[1], GetKeyState(VK_MBUTTON) & (1 << 15));
Win32ProcessKeyboardMessage(&NewInput->MouseButtons[2], GetKeyState(VK_RBUTTON) & (1 << 15));
Win32ProcessKeyboardMessage(&NewInput->MouseButtons[3], GetKeyState(VK_XBUTTON1) & (1 << 15));
Win32ProcessKeyboardMessage(&NewInput->MouseButtons[4], GetKeyState(VK_XBUTTON2) & (1 << 15));
// TODO: should we poll this more frequently
// TODO: dont poll disconnected controllers to prevent xinput frame rate impact
DWORD MaxControllerCount = XUSER_MAX_COUNT;
if (MaxControllerCount > (ArrayCount(NewInput->Controllers) - 1)) {
MaxControllerCount = (ArrayCount(NewInput->Controllers) - 1);
}
for (DWORD ControllerIndex = 0; ControllerIndex < MaxControllerCount; ++ControllerIndex) {
DWORD OurControllerIndex = ControllerIndex + 1;
game_controller_input *OldController = GetController(OldInput, OurControllerIndex);
game_controller_input *NewController = GetController(NewInput, OurControllerIndex);
XINPUT_STATE ControllerState;
if (XInputGetState(ControllerIndex, &ControllerState) == ERROR_SUCCESS) {
NewController->IsConnected = true;
NewController->IsAnalog = OldController->IsAnalog;
// TODO: See if ControllerState.dwPacketNumber increments too rapidly
XINPUT_GAMEPAD *Pad = &ControllerState.Gamepad;
// TODO: currently handling a square deadzone, check if it is circular
NewController->StickAverageX = Win32ProcessXInputStickValue(Pad->sThumbLX, XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE);
NewController->StickAverageY = Win32ProcessXInputStickValue(Pad->sThumbLY, XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE);
if ((NewController->StickAverageX != 0.0f) || (NewController->StickAverageY != 0.0f)) {
NewController->IsAnalog = true;
}
if (Pad->wButtons & XINPUT_GAMEPAD_DPAD_UP) {
NewController->StickAverageY = 1.0f;
NewController->IsAnalog = false;
}
if (Pad->wButtons & XINPUT_GAMEPAD_DPAD_DOWN) {
NewController->StickAverageY = -1.0f;
NewController->IsAnalog = false;
}
if (Pad->wButtons & XINPUT_GAMEPAD_DPAD_LEFT) {
NewController->StickAverageX = -1.0f;
NewController->IsAnalog = false;
}
if (Pad->wButtons & XINPUT_GAMEPAD_DPAD_RIGHT) {
NewController->StickAverageX = 1.0f;
NewController->IsAnalog = false;
}
real32 Threshold = 0.5f;
Win32ProcessXInputDigitalButton((NewController->StickAverageX < -Threshold) ? 1 : 0, &OldController->MoveLeft, 1, &NewController->MoveLeft);
Win32ProcessXInputDigitalButton((NewController->StickAverageX > Threshold) ? 1 : 0, &OldController->MoveRight, 1, &NewController->MoveRight);
Win32ProcessXInputDigitalButton((NewController->StickAverageY < -Threshold) ? 1 : 0, &OldController->MoveDown, 1, &NewController->MoveDown);
Win32ProcessXInputDigitalButton((NewController->StickAverageY > Threshold) ? 1 : 0, &OldController->MoveUp, 1, &NewController->MoveUp);
Win32ProcessXInputDigitalButton(Pad->wButtons, &OldController->ActionDown, XINPUT_GAMEPAD_A, &NewController->ActionDown);
Win32ProcessXInputDigitalButton(Pad->wButtons, &OldController->ActionRight, XINPUT_GAMEPAD_B, &NewController->ActionRight);
Win32ProcessXInputDigitalButton(Pad->wButtons, &OldController->ActionLeft, XINPUT_GAMEPAD_X, &NewController->ActionLeft);
Win32ProcessXInputDigitalButton(Pad->wButtons, &OldController->ActionUp, XINPUT_GAMEPAD_Y, &NewController->ActionUp);
Win32ProcessXInputDigitalButton(Pad->wButtons, &OldController->LeftShoulder, XINPUT_GAMEPAD_LEFT_SHOULDER, &NewController->LeftShoulder);
Win32ProcessXInputDigitalButton(Pad->wButtons, &OldController->RightShoulder, XINPUT_GAMEPAD_RIGHT_SHOULDER, &NewController->RightShoulder);
Win32ProcessXInputDigitalButton(Pad->wButtons, &OldController->Start, XINPUT_GAMEPAD_START, &NewController->Start);
Win32ProcessXInputDigitalButton(Pad->wButtons, &OldController->Back, XINPUT_GAMEPAD_BACK, &NewController->Back);
}
else {
// NOTE: the controller is not available
NewController->IsConnected = false;
}
}
thread_context Thread = {};
game_offscreen_buffer Buffer = {};
Buffer.Memory = GlobalBackbuffer.Memory;
Buffer.Width = GlobalBackbuffer.Width;
Buffer.Height = GlobalBackbuffer.Height;
Buffer.Pitch = GlobalBackbuffer.Pitch;
Buffer.BytesPerPixel = GlobalBackbuffer.BytesPerPixel;
if (Win32State.InputRecordingIndex) {
Win32RecordInput(&Win32State, NewInput);
}
if (Win32State.InputPlaybackIndex) {
Win32PlaybackInput(&Win32State, NewInput);
}
if (Game.UpdateAndRender) {
Game.UpdateAndRender(&Thread, &GameMemory, NewInput, &Buffer);
}
LARGE_INTEGER AudioWallClock = Win32GetWallClock();
real32 FromBeginToAudioSeconds = Win32GetSecondsElapsed(FlipWallClock, AudioWallClock);
DWORD PlayCursor;
DWORD WriteCursor;
if (GlobalSecondaryBuffer->GetCurrentPosition(&PlayCursor, &WriteCursor) == DS_OK) {
/* NOTE: Sound output explanation
We define a safety value that is the number of samples we think our game update loop can vary by.
When we wake up to write audio we look at the play cursor position and forecast where we think it will be on the next frame boundary.
If the write cursor is before that by at least our safety value, the target fill position is the frame boundary plus one frame. This gives us perfect audio sync if the audio latency is low enough.
If the write cursor is after that safety value then we assume we can't sync the audio so we write one frames worth of audio plus the safety values worth of samples.
*/
if (!SoundIsValid) {
SoundOutput.RunningSampleIndex = WriteCursor / SoundOutput.BytesPerSample;
SoundIsValid = true;
}
DWORD ByteToLock = (SoundOutput.RunningSampleIndex * SoundOutput.BytesPerSample) % SoundOutput.SecondaryBufferSize;
DWORD ExpectedSoundBytesPerFrame = (int)((real32)(SoundOutput.SamplesPerSecond * SoundOutput.BytesPerSample) / GameUpdateHz);
real32 SecondsLeftUntilFlip = TargetSecondsPerFrame - FromBeginToAudioSeconds;
DWORD ExpectedBytesUntilFlip = (DWORD)((SecondsLeftUntilFlip / TargetSecondsPerFrame) * (real32)ExpectedSoundBytesPerFrame);
DWORD ExpectedFrameBoundaryByte = PlayCursor + ExpectedBytesUntilFlip;
DWORD SafeWriteCursor = WriteCursor;
if (SafeWriteCursor < PlayCursor) {
SafeWriteCursor += SoundOutput.SecondaryBufferSize;
}
Assert(SafeWriteCursor >= PlayCursor);
SafeWriteCursor += SoundOutput.SafetyBytes;
bool32 AudioCardIsLowLatency = (SafeWriteCursor < ExpectedFrameBoundaryByte);
DWORD TargetCursor = 0;
if (AudioCardIsLowLatency) {
TargetCursor = ExpectedFrameBoundaryByte + ExpectedSoundBytesPerFrame;
}
else {
TargetCursor = WriteCursor + ExpectedSoundBytesPerFrame + SoundOutput.SafetyBytes;
}
TargetCursor = TargetCursor % SoundOutput.SecondaryBufferSize;
DWORD BytesToWrite = 0;
if (ByteToLock > TargetCursor) {
BytesToWrite = SoundOutput.SecondaryBufferSize - ByteToLock;
BytesToWrite += TargetCursor;
}
else {
BytesToWrite = TargetCursor - ByteToLock;
}
game_sound_output_buffer SoundBuffer = {};
SoundBuffer.SamplesPerSecond = SoundOutput.SamplesPerSecond;
SoundBuffer.SampleCount = BytesToWrite / SoundOutput.BytesPerSample;
SoundBuffer.Samples = Samples;
if (Game.GetSoundSamples) {
Game.GetSoundSamples(&Thread, &GameMemory, &SoundBuffer);
}
#if HANDMADE_INTERNAL
win32_debug_time_marker *Marker = &DebugTimeMarkers[DebugTimeMarkerIndex];
Marker->OutputPlayCursor = PlayCursor;
Marker->OutputWriteCursor = WriteCursor;
Marker->OutputLocation = ByteToLock;
Marker->OutputByteCount = BytesToWrite;
Marker->ExpectedFlipPlayCursor = ExpectedFrameBoundaryByte;
DWORD UnwrappedWriteCursor = WriteCursor;
if (UnwrappedWriteCursor < PlayCursor) {
UnwrappedWriteCursor += SoundOutput.SecondaryBufferSize;
}
AudioLatencyBytes = UnwrappedWriteCursor - PlayCursor;
AudioLatencySeconds = ((real32)AudioLatencyBytes / (real32)SoundOutput.BytesPerSample) / (real32)SoundOutput.SamplesPerSecond;
#if 0
char DebugSoundBuffer[256];
sprintf_s(DebugSoundBuffer, "BTL:%u TC:%u BTW:%u - PC:%u WC:%u DELTA:%u (%fs)\n", ByteToLock, TargetCursor, BytesToWrite, PlayCursor, WriteCursor, AudioLatencyBytes, AudioLatencySeconds);
OutputDebugStringA(DebugSoundBuffer);
#endif
#endif
Win32FillSoundBuffer(&SoundOutput, ByteToLock, BytesToWrite, &SoundBuffer);
}
else {
SoundIsValid = false;
}
LARGE_INTEGER WorkCounter = Win32GetWallClock();
real32 WorkSecondsElapsed = Win32GetSecondsElapsed(LastCounter, WorkCounter);
// TODO: not tested yet!
real32 SecondsElapsedForFrame = WorkSecondsElapsed;
if (SecondsElapsedForFrame < TargetSecondsPerFrame) {
if (SleepIsGranular) {
DWORD SleepMS = (DWORD)(1000.0f * (TargetSecondsPerFrame - SecondsElapsedForFrame));
if (SleepMS > 0) {
Sleep(SleepMS);
}
}
real32 TestSecondsElapsedForFrame = Win32GetSecondsElapsed(LastCounter, Win32GetWallClock());
if (TestSecondsElapsedForFrame < TargetSecondsPerFrame) {
// TODO: log missed sleep here
}
while (SecondsElapsedForFrame < TargetSecondsPerFrame) {
SecondsElapsedForFrame = Win32GetSecondsElapsed(LastCounter, Win32GetWallClock());
}
}
else {
// TODO: missed frame rate
// TODO: logging
}
LARGE_INTEGER EndCounter = Win32GetWallClock();
real32 MSPerFrame = 1000.0f * Win32GetSecondsElapsed(LastCounter, EndCounter);
LastCounter = EndCounter;
win32_window_dimension Dimension = Win32GetWindowDimension(Window);
HDC BufferDC = GetDC(Window);
Win32DisplayBufferInWindow(&GlobalBackbuffer, BufferDC, Dimension.Width, Dimension.Height);
ReleaseDC(Window, BufferDC);
FlipWallClock = Win32GetWallClock();
#if HANDMADE_INTERNAL
DWORD DebugPlayCursor;
DWORD DebugWriteCursor;
if (GlobalSecondaryBuffer->GetCurrentPosition(&DebugPlayCursor, &DebugWriteCursor) == DS_OK) {
Assert(DebugTimeMarkerIndex < ArrayCount(DebugTimeMarkers));
win32_debug_time_marker *Marker = &DebugTimeMarkers[DebugTimeMarkerIndex];
Marker->FlipPlayCursor = DebugPlayCursor;
Marker->FlipWriteCursor = DebugWriteCursor;
}
#endif
game_input *Temp = NewInput;
NewInput = OldInput;
OldInput = Temp;
// TODO: should these be cleared?
#if 0
uint64 EndCycleCount = __rdtsc();
uint64 CyclesElapsed = EndCycleCount - LastCycleCount;
LastCycleCount = EndCycleCount;
// real32 FPS = (real32)GlobalPerfCounterFrequency / (real32)CounterElapsed;
real32 FPS = 0.0f;
real32 MCPF = (real32)CyclesElapsed / (1000.0f * 1000.0f);
char DebugPerformanceBuffer[256];
sprintf_s(DebugPerformanceBuffer, "%0.02fmspf, %0.02ffps, %0.02fmcpf\n", MSPerFrame, FPS, MCPF);
OutputDebugStringA(DebugPerformanceBuffer);
#endif
#if HANDMADE_INTERNAL
++DebugTimeMarkerIndex;
if (DebugTimeMarkerIndex == ArrayCount(DebugTimeMarkers)) {
DebugTimeMarkerIndex = 0;
}
#endif
}
}
}
else {
// TODO: logging
}
}
else {
// TODO: logging
}
}
else {
// TODO: logging
}
return(0);
}
int CALLBACK WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow) {
// Allocate program memory
g_program_memory.start = malloc(MAX_INTERNAL_MEMORY_SIZE);
g_program_memory.free_memory = g_program_memory.start;
// TODO: add checks for overflow when allocating
// Main program state
Program_State *state =
(Program_State *)g_program_memory.allocate(sizeof(Program_State));
state->init(&g_program_memory, &g_pixel_buffer,
(Raytrace_Work_Queue *)&g_raytrace_queue);
// Create window class
WNDCLASS WindowClass = {};
WindowClass.style = CS_OWNDC | CS_VREDRAW | CS_HREDRAW;
WindowClass.lpfnWndProc = Win32WindowProc;
WindowClass.hInstance = hInstance;
WindowClass.lpszClassName = "VMWindowClass";
// Set target sleep resolution
{
TIMECAPS tc;
UINT wTimerRes;
if (timeGetDevCaps(&tc, sizeof(TIMECAPS)) != TIMERR_NOERROR) {
OutputDebugStringA("Cannot set the sleep resolution\n");
exit(1);
}
wTimerRes = min(max(tc.wPeriodMin, 1), tc.wPeriodMax); // 1 ms
timeBeginPeriod(wTimerRes);
}
QueryPerformanceFrequency(&gPerformanceFrequency);
if (!RegisterClass(&WindowClass)) {
// TODO: logging
printf("Couldn't register window class\n");
exit(1);
}
// Create window so that its client area is exactly kWindowWidth/Height
DWORD WindowStyle = WS_OVERLAPPEDWINDOW | WS_VISIBLE;
RECT WindowRect = {};
WindowRect.right = state->kWindowWidth;
WindowRect.bottom = state->kWindowHeight;
AdjustWindowRect(&WindowRect, WindowStyle, 0);
int WindowWidth = WindowRect.right - WindowRect.left;
int WindowHeight = WindowRect.bottom - WindowRect.top;
HWND Window = CreateWindow(WindowClass.lpszClassName, 0, WindowStyle,
CW_USEDEFAULT, CW_USEDEFAULT, WindowWidth,
WindowHeight, 0, 0, hInstance, 0);
if (!Window) {
printf("Couldn't create window\n");
exit(1);
}
// We're not going to release it as we use CS_OWNDC
HDC hdc = GetDC(Window);
g_running = true;
// Set proper buffer values based on actual client size
Win32ResizeClientWindow(Window);
// Init OpenGL
{
PIXELFORMATDESCRIPTOR DesiredPixelFormat = {};
DesiredPixelFormat.nSize = sizeof(DesiredPixelFormat);
DesiredPixelFormat.nVersion = 1;
DesiredPixelFormat.iPixelType = PFD_TYPE_RGBA;
DesiredPixelFormat.dwFlags =
PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW | PFD_DOUBLEBUFFER;
DesiredPixelFormat.cColorBits = 32;
DesiredPixelFormat.cAlphaBits = 8;
DesiredPixelFormat.iLayerType = PFD_MAIN_PLANE;
int SuggestedPixelFormatIndex = ChoosePixelFormat(hdc, &DesiredPixelFormat);
PIXELFORMATDESCRIPTOR SuggestedPixelFormat;
DescribePixelFormat(hdc, SuggestedPixelFormatIndex,
sizeof(SuggestedPixelFormat), &SuggestedPixelFormat);
SetPixelFormat(hdc, SuggestedPixelFormatIndex, &SuggestedPixelFormat);
HGLRC OpenGLRC = wglCreateContext(hdc);
if (wglMakeCurrent(hdc, OpenGLRC)) {
// Success
glGenTextures(1, &gTextureHandle);
typedef BOOL WINAPI wgl_swap_interval_ext(int interval);
wgl_swap_interval_ext *wglSwapInterval =
(wgl_swap_interval_ext *)wglGetProcAddress("wglSwapIntervalEXT");
if (wglSwapInterval) {
wglSwapInterval(1);
} else {
// VSync not enabled or not supported
assert(false);
}
} else {
// Something's wrong
assert(false);
}
}
Cursor_Type current_cursor = Cursor_Type_Arrow;
HCURSOR win_cursors[Cursor_Type__COUNT];
win_cursors[Cursor_Type_Arrow] = LoadCursor(NULL, IDC_ARROW);
win_cursors[Cursor_Type_Cross] = LoadCursor(NULL, IDC_CROSS);
win_cursors[Cursor_Type_Hand] = LoadCursor(NULL, IDC_HAND);
win_cursors[Cursor_Type_Resize_Vert] = LoadCursor(NULL, IDC_SIZENS);
win_cursors[Cursor_Type_Resize_Horiz] = LoadCursor(NULL, IDC_SIZEWE);
User_Input inputs[2];
User_Input *old_input = &inputs[0];
User_Input *new_input = &inputs[1];
*new_input = {};
LARGE_INTEGER last_timestamp = Win32GetWallClock();
// Create worker threads
{
const int kNumThreads = 4;
// Init work queue
g_raytrace_queue.next_entry_to_add = 0;
g_raytrace_queue.next_entry_to_do = 0;
u32 initial_num_threads = 0;
g_raytrace_queue.semaphore = CreateSemaphoreEx(
0, initial_num_threads, kNumThreads, 0, 0, SEMAPHORE_ALL_ACCESS);
Thread_Info threads[kNumThreads];
for (int i = 0; i < kNumThreads; i++) {
threads[i].thread_num = i + 1;
HANDLE thread_handle = CreateThread(
0, // LPSECURITY_ATTRIBUTES lpThreadAttributes,
0, // SIZE_T dwStackSize,
RaytraceWorkerThread, // LPTHREAD_START_ROUTINE lpStartAddress,
&threads[i], // LPVOID lpParameter,
0, // DWORD dwCreationFlags,
NULL // LPDWORD lpThreadId
);
threads[i].thread_handle = thread_handle;
if (thread_handle == NULL) {
printf("CreateThread error: %d\n", GetLastError());
exit(1);
}
}
}
// Event loop
while (g_running) {
// Process messages
MSG message;
while (PeekMessage(&message, 0, 0, 0, PM_REMOVE)) {
// Get keyboard messages
switch (message.message) {
case WM_QUIT: {
g_running = false;
} break;
case WM_SYSKEYDOWN:
case WM_SYSKEYUP:
case WM_KEYDOWN:
case WM_KEYUP: {
u32 vk_code = (u32)message.wParam;
bool was_down = ((message.lParam & (1 << 30)) != 0);
bool is_down = ((message.lParam & (1 << 31)) == 0);
bool alt_key_was_down = (message.lParam & (1 << 29)) != 0;
if ((vk_code == VK_F4) && alt_key_was_down) {
g_running = false;
}
if (was_down == is_down) {
break; // nothing has changed
}
if (vk_code == VK_ESCAPE) {
new_input->buttons[IB_escape] = is_down;
}
if (vk_code == VK_UP) {
new_input->buttons[IB_up] = is_down;
}
if (vk_code == VK_DOWN) {
new_input->buttons[IB_down] = is_down;
}
if (vk_code == VK_LEFT) {
new_input->buttons[IB_left] = is_down;
}
if (vk_code == VK_RIGHT) {
new_input->buttons[IB_right] = is_down;
}
if (vk_code == VK_SHIFT) {
new_input->buttons[IB_shift] = is_down;
}
// Handle symbols
int symbol = (int)vk_code;
if (vk_code == VK_NUMPAD0)
symbol = '0';
else if (vk_code == VK_NUMPAD1)
symbol = '1';
else if (vk_code == VK_NUMPAD2)
symbol = '2';
else if (vk_code == VK_NUMPAD3)
symbol = '3';
else if (vk_code == VK_NUMPAD4)
symbol = '4';
else if (vk_code == VK_NUMPAD5)
symbol = '5';
else if (vk_code == VK_NUMPAD6)
symbol = '6';
else if (vk_code == VK_NUMPAD7)
symbol = '7';
else if (vk_code == VK_NUMPAD8)
symbol = '8';
else if (vk_code == VK_NUMPAD9)
symbol = '9';
if (('A' <= symbol && symbol <= 'Z') ||
('0' <= symbol && symbol <= '9')) {
new_input->buttons[IB_key] = is_down;
new_input->symbol = symbol;
}
} break;
case WM_MOUSEWHEEL: {
int delta = (int)message.wParam / (65536 * WHEEL_DELTA);
new_input->scroll += delta;
} break;
default: {
TranslateMessage(&message);
DispatchMessageA(&message);
} break;
}
}
// Get mouse input
{
POINT mouse_pointer;
GetCursorPos(&mouse_pointer);
ScreenToClient(Window, &mouse_pointer);
new_input->mouse = {mouse_pointer.x, mouse_pointer.y};
new_input->buttons[IB_mouse_left] =
(GetKeyState(VK_LBUTTON) & (1 << 15)) != 0;
new_input->buttons[IB_mouse_right] =
(GetKeyState(VK_RBUTTON) & (1 << 15)) != 0;
new_input->buttons[IB_mouse_middle] =
(GetKeyState(VK_MBUTTON) & (1 << 15)) != 0;
}
Update_Result result =
update_and_render(&g_program_memory, state, new_input);
#include "debug/ED_debug_draw.cpp"
assert(0 <= result.cursor && result.cursor < Cursor_Type__COUNT);
SetCursor(win_cursors[result.cursor]);
Win32UpdateWindow(hdc);
// Swap inputs
User_Input *tmp = old_input;
old_input = new_input;
new_input = tmp;
// Zero input
*new_input = {};
new_input->old = old_input; // Save so we can refer to it later
// Retain the button state
for (size_t i = 0; i < COUNT_OF(new_input->buttons); i++) {
new_input->buttons[i] = old_input->buttons[i];
}
for (size_t i = 0; i < COUNT_OF(new_input->mouse_positions); i++) {
new_input->mouse_positions[i] = old_input->mouse_positions[i];
}
new_input->symbol = old_input->symbol;
r32 ms_elapsed =
Win32GetMillisecondsElapsed(last_timestamp, Win32GetWallClock());
g_FPS.value = (int)(1000.0f / ms_elapsed);
last_timestamp = Win32GetWallClock();
}
return 0;
}
