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WindowsMain.c
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WindowsMain.c
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// Filename: Main.c
// Contains WinMain, which is the entry point of the entire game, as well as code for functions
// that are common across multiple game states or are considered fundamental infrastructure.
//
// Project Codename: GameB
// TODO: Come up with a better name later.
// 2020 Joseph Ryan Ries <ryanries09@gmail.com>
// My YouTube series where we program an entire video game from scratch in C.
// Watch it on YouTube: https://www.youtube.com/watch?v=3zFFrBSdBvA
// Follow along on GitHub: https://github.com/ryanries/GameB
// Find me on Twitter @JosephRyanRies
// # License
// ----------
// The source code in this project is licensed under the MIT license.
// The media assets such as artwork, custom fonts, music and sound effects are licensed under a separate license.
// A copy of that license can be found in the 'Assets' directory.
// stb_vorbis by Sean Barrett is public domain and a copy of its license can be found in the stb_vorbis.c file.
// miniz by Rich Geldreich <richgel99@gmail.com> is public domain (or possibly MIT licensed) and a copy of its license can be found in the miniz.c file.
// "Don't build software. Create an endless yearning for C." -- Antoine de Saint-Exupery
//
// --- DONE ---
// Show them the character naming alpha blending bug when trying to print a single character of a string at a time
// Renamed some functions such as BlitStringToBuffer -> BlitString, Blit32BppBitmapToBuffer -> BlitBitmap, etc.
// Added per-color adjustments and alpha blending everywhere else
// Added support for new alpha blending flag to DrawWindow
// Went HAM with alpha blending
// Added inventory screen
// Spent 2 whole days banging on battle scene logic -- it's close to complete!
//
// --- TODO ---
// Get rid of stdint.h?
//
// Does setting gPlayer.RandomEncounterPercentage to 90 really *feel* like 10%? (Does 80 really *feel* like 20%, etc.?)
// Make the fade in and fade out on the overworld better.
// Make gPortalTiles an array like gPassableTiles
// Add a picture of an xbox gamepad to the "gamepadunplugged" screen
// Create a windowing system
// enhance Blit32BppBitmap function so that it can alter the color of bitmaps at run time?
// maybe a new MAP data structure for map GAMEBITMAP plus TILEMAP together? (plus default GAMESOUND too?)
// should we enhance BlitStringToBuffer to support varargs?
// Optimization: String caching?
// Optimization: Should we defer the loading of some assets or just load them all as soon as the game is launched?
// Add logging to InitializeHero
//
// Add movement speed to player
//
// use enums instead of #defines ?
//
// LogMessageA option to spawn msgbox ? And assert ?
//
// Blit32bppbitmap draw off the edge of the screen ?
//
// Screen size code for monitors that are not 16 : 9
//
// Game states (Maybe each state should be a struct that includes an array of valid gamestates that it may transition to?)
#include "CommonMain.h"
#include "Platform.h"
// Contains declarations that are specific to the Opening Splash Screen game state.
#include "OpeningSplashScreen.h"
// Contains declarations that are specific to the Title Screen game state.
#include "TitleScreen.h"
// Contains declarations that are specific to the Options Screen game state.
#include "OptionsScreen.h"
// Contains declarations that are specific to the Exit Yes/No Screen game state.
#include "ExitYesNoScreen.h"
// Contains declarations that are specific to the Gamepad Unplugged Screen game state.
#include "GamepadUnplugged.h"
// Contains declarations that are specific to the Character Naming Screen game state.
#include "CharacterNamingScreen.h"
// Contains declarations that are specific to the Overworld game state.
#include "Overworld.h"
// Contains declarations that are specific to the Battle game state.
#include "Battle.h"
// Contains declarations that are specific to the "Are you sure you want to start a new game?" screen.
#include "NewGameAreYouSure.h"
#include <time.h>
// These are globals that are used only in Main.c. These are all automatically initialized to 0.
// If the game window does not have focus, then do not process player input.
BOOL gWindowHasFocus;
// Holds the state of the Xbox360 gamepad, e.g., is the X button currently pushed or not?
XINPUT_STATE gGamepadState;
// The COM interfaces for XAudio2, which is a Microsoft audio library that we
// use for playing sounds and music. XAudio2 uses the concept of source voices and
// mastering voices. We submit audio data to the source voice, and the source
// voice sends that to the mastering voice, which mixes everything together and sends the final audio
// data to the playback device.
// We only use a single mastering voice, but we use one source voice for background music and
// we use 4 source voices for sound effects. By using 4 source voices for sound effects, we can
// play up to 4 SFX simultaneously. Otherwise, submitting multiple buffers to the same source voice
// before the previous sound has finished playing will simply queue up the sounds to play one after
// the other.
IXAudio2* gXAudio;
IXAudio2MasteringVoice* gXAudioMasteringVoice;
_NtQueryTimerResolution NtQueryTimerResolution = NULL;
// Forward declartions of functions in this file.
LRESULT CALLBACK MainWindowProc(_In_ HWND WindowHandle, _In_ UINT Message, _In_ WPARAM WParam, _In_ LPARAM LParam);
DWORD InitializeOpenGL(void);
DWORD CreateMainGameWindow(void);
BOOL GameIsAlreadyRunning(void);
void ProcessPlayerInput(void);
void RenderFrameGraphics(void);
void FindFirstConnectedGamepad(void);
HRESULT InitializeSoundEngine(void);
DWORD WINAPI AssetLoadingThreadProc(_In_ LPVOID lpParam);
int64_t FileSizeA(_In_ const char* FileName);
// The game's entry point.
int __stdcall WinMain(_In_ HINSTANCE Instance, _In_opt_ HINSTANCE PreviousInstance, _In_ PSTR CommandLine, _In_ INT CmdShow)
{
UNREFERENCED_PARAMETER(Instance);
UNREFERENCED_PARAMETER(PreviousInstance);
UNREFERENCED_PARAMETER(CommandLine);
UNREFERENCED_PARAMETER(CmdShow);
// Handles Windows' Window messages to our game's window.
MSG Message = { 0 };
// The time in microseconds that each frame starts.
int64_t FrameStart = 0;
// The time in microseconds that each frame ends.
// This variable is reused to measure both "raw" and "cooked" frame times.
int64_t FrameEnd = 0;
// The elapsed time in microseconds that each frame ends.
// This variable is reused to measure both "raw" and "cooked" frame times.
int64_t ElapsedMicroseconds = 0;
// We accumulate the amount of time taken to render a "raw" frame and then
// calculate the average every x frames, i.e., we divide it by x number of frames rendered.
int64_t ElapsedMicrosecondsAccumulatorRaw = 0;
// We accumulate the amount of time taken to render a "cooked" frame and then
// calculate the average every x frames, i.e., we divide it by x number of frames rendered.
// This should hopefully be a steady 60fps. A "cooked" frame is a frame after we have
// waited/slept for a calculated amount of time before starting the next frame.
int64_t ElapsedMicrosecondsAccumulatorCooked = 0;
// The time the game started. This is used to calculate CPU usage percentage.
FILETIME ProcessCreationTime = { 0 };
// This is needed by the GetProcessTimes function, but we don't use it.
FILETIME ProcessExitTime = { 0 };
// These four variables are used to calculate the average CPU usage.
int64_t CurrentUserCPUTime = 0;
int64_t CurrentKernelCPUTime = 0;
int64_t PreviousUserCPUTime = 0;
int64_t PreviousKernelCPUTime = 0;
// Used to ensure that the assets file both exists and is not a directory.
DWORD AssetFileAttributes = 0;
int64_t LogFileSize = 0;
srand(time(NULL));
// This critical section is used to synchronize access to the log file vis a vis
// LogMessageA when used by multiple threads simultaneously. Documentation says
// this function never fails, therefore checking its return code is not important.
// But the critical section does need to be initialized before attempting to log anything.
#pragma warning(suppress: 6031)
InitializeCriticalSectionAndSpinCount(&gLogCritSec, 0x400);
// This event gets signalled/set after the most essential assets have been loaded.
// "Essential" means the assets required to render the splash screen.
if ((gEssentialAssetsLoadedEvent = CreateEventA(NULL, TRUE, FALSE, "gEssentialAssetsLoadedEvent")) == NULL)
{
MessageBoxA(NULL, "CreateEvent failed!", "Error!", MB_ICONERROR | MB_OK);
goto Exit;
}
// LoadRegistryParameters should be the first thing that runs, and no logging
// should be attempted before this function runs, because the user-configurable
// logging verbosity level is defined in the registry and is thus retrieved by this function.
if (LoadSettings() != ERROR_SUCCESS)
{
MessageBoxA(NULL, "LoadRegistryParameters failed!", "Error!", MB_ICONERROR | MB_OK);
goto Exit;
}
gSFXVolume = (float)gRegistryParams.SFXVolume / 100.0f;
gMusicVolume = (float)gRegistryParams.MusicVolume / 100.0f;
LogMessageA(LL_INFO, "[%s] %s %s is starting.", __FUNCTION__, GAME_NAME, GAME_VER);
LogFileSize = FileSizeA(LOG_FILE_NAME);
if (LogFileSize > 1024 * 1024)
{
LogMessageA(LL_WARNING, "[%s] Log file %s is %lld bytes, which is pretty large! Consider deleting the log file!", __FUNCTION__, LOG_FILE_NAME, LogFileSize);
}
else
{
LogMessageA(LL_INFO, "[%s] Log file %s is %lld bytes.", __FUNCTION__, LOG_FILE_NAME, LogFileSize);
}
// This function uses a global mutex to determine whether another instance of the same
// process is already running. This is not hack-proof but it does prevent accidents.
if (GameIsAlreadyRunning() == TRUE)
{
LogMessageA(LL_ERROR, "[%s] Another instance of this program is already running!", __FUNCTION__);
MessageBoxA(NULL, "Another instance of this program is already running!", "Error!", MB_ICONEXCLAMATION | MB_OK);
goto Exit;
}
// We need the undocumented Windows API function NtQueryTimerResolution to get the resolution of the global system timer.
// A higher resolution timer will show a lower number, because if your clock can tick every e.g. 0.5ms, that is a higher
// resolution than a timer that can only tick every 1.0ms.
if ((NtQueryTimerResolution = (_NtQueryTimerResolution)GetProcAddress(GetModuleHandleA("ntdll.dll"), "NtQueryTimerResolution")) == NULL)
{
LogMessageA(LL_ERROR, "[%s] Couldn't find the NtQueryTimerResolution function in ntdll.dll! GetProcAddress failed! Error 0x%08lx!", __FUNCTION__, GetLastError());
MessageBoxA(NULL, "Couldn't find the NtQueryTimerResolution function in ntdll.dll!", "Error!", MB_ICONERROR | MB_OK);
goto Exit;
}
NtQueryTimerResolution(&gPerformanceData.MinimumTimerResolution, &gPerformanceData.MaximumTimerResolution, &gPerformanceData.CurrentTimerResolution);
SYSTEM_INFO SystemInfo;
GetSystemInfo(&SystemInfo);
LogMessageA(LL_INFO, "[%s] Number of CPUs: %d", __FUNCTION__, SystemInfo.dwNumberOfProcessors);
switch (SystemInfo.wProcessorArchitecture)
{
case PROCESSOR_ARCHITECTURE_INTEL:
{
LogMessageA(LL_INFO, "[%s] CPU Architecture: x86", __FUNCTION__);
break;
}
case PROCESSOR_ARCHITECTURE_IA64:
{
LogMessageA(LL_INFO, "[%s] CPU Architecture: Itanium", __FUNCTION__);
break;
}
case PROCESSOR_ARCHITECTURE_ARM64:
{
LogMessageA(LL_INFO, "[%s] CPU Architecture: ARM64", __FUNCTION__);
break;
}
case PROCESSOR_ARCHITECTURE_ARM:
{
LogMessageA(LL_INFO, "[%s] CPU Architecture: ARM", __FUNCTION__);
break;
}
case PROCESSOR_ARCHITECTURE_AMD64:
{
LogMessageA(LL_INFO, "[%s] CPU Architecture: x64", __FUNCTION__);
break;
}
default:
{
LogMessageA(LL_WARNING, "[%s] CPU Architecture: Unknown", __FUNCTION__);
}
}
#ifdef __AVX2__
LogMessageA(LL_INFO, "[%s] SIMD Level: AVX2", __FUNCTION__);
#else
LogMessageA(LL_WARNING, "[%s] SIMD Level: None", __FUNCTION__);
#endif
// Initialize the variable that is used to calculate average CPU usage of this process.
int64_t PreviousSystemTime;
GetSystemTimeAsFileTime((FILETIME*)&PreviousSystemTime);
// The timeBeginPeriod function controls a global system-wide timer. So
// increasing the clock resolution here will affect all processes running on this
// entire system. It will increase context switching, the rate at which timers
// fire across the entire system, etc. Due to this, Microsoft generally discourages
// the use of timeBeginPeriod completely. However, we need it, because without
// 1ms timer resolution, we simply cannot maintain a reliable 60 frames per second.
// Also, we don't need to worry about calling timeEndPeriod, because Windows will
// automatically cancel our requested timer resolution once this process exits.
if (timeBeginPeriod(1) == TIMERR_NOCANDO)
{
LogMessageA(LL_ERROR, "[%s] Failed to set global timer resolution!", __FUNCTION__);
MessageBoxA(NULL, "Failed to set global timer resolution!", "Error!", MB_ICONERROR | MB_OK);
goto Exit;
}
LogMessageA(LL_INFO, "[%s] System Timer Resolution: Min %d Max %d Current %d",
__FUNCTION__,
gPerformanceData.MinimumTimerResolution,
gPerformanceData.MaximumTimerResolution,
gPerformanceData.CurrentTimerResolution);
if (gPerformanceData.CurrentTimerResolution < 9500 ||
gPerformanceData.CurrentTimerResolution > 10500)
{
LogMessageA(LL_WARNING, "[%s] Current timer resolution is sub-optimal! Game performance may be negatively affected!");
}
// Increase process and thread priority to minimize the chances of another thread on the system
// preempting us when we need to run and causing a stutter in our frame rate. (Though it can still happen.)
// Windows is not a real-time OS and you cannot guarantee timings or deadlines, but you can get close.
if (SetPriorityClass(GetCurrentProcess(), HIGH_PRIORITY_CLASS) == 0)
{
LogMessageA(LL_ERROR, "[%s] Failed to set process priority! Error 0x%08lx", __FUNCTION__, GetLastError());
MessageBoxA(NULL, "Failed to set process priority!", "Error!", MB_ICONERROR | MB_OK);
goto Exit;
}
if (SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST) == 0)
{
LogMessageA(LL_ERROR, "[%s] Failed to set thread priority! Error 0x%08lx!", __FUNCTION__, GetLastError());
MessageBoxA(NULL, "Failed to set thread priority!", "Error!", MB_ICONERROR | MB_OK);
goto Exit;
}
if (CreateMainGameWindow() != ERROR_SUCCESS)
{
LogMessageA(LL_ERROR, "[%s] CreateMainGameWindow failed!", __FUNCTION__);
MessageBoxA(NULL, "Failed to create game window!", "Error!", MB_ICONERROR | MB_OK);
goto Exit;
}
if (InitializeOpenGL() != ERROR_SUCCESS)
{
LogMessageA(LL_ERROR, "[%s] InitializeOpenGL failed!", __FUNCTION__);
MessageBoxA(NULL, "Failed to initialize OpenGL!", "Error!", MB_ICONERROR | MB_OK);
goto Exit;
}
AssetFileAttributes = GetFileAttributesA(ASSET_FILE);
if ((AssetFileAttributes == INVALID_FILE_ATTRIBUTES) || (AssetFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
{
ShowCursor(TRUE);
LogMessageA(LL_ERROR, "[%s] The asset file %s was not found! It must reside in the same directory as the game executable.", __FUNCTION__, ASSET_FILE);
MessageBoxA(NULL, "The asset file was not found! It must reside in the same directory as the game executable.", "Error!", MB_ICONERROR | MB_OK);
goto Exit;
}
if ((gAssetLoadingThreadHandle = CreateThread(NULL, 0, AssetLoadingThreadProc, NULL, 0, NULL)) == NULL)
{
ShowCursor(TRUE);
MessageBoxA(NULL, "CreateThread failed!", "Error!", MB_ICONERROR | MB_OK);
goto Exit;
}
if (InitializeSoundEngine() != S_OK)
{
ShowCursor(TRUE);
MessageBoxA(NULL, "InitializeSoundEngine failed!", "Error!", MB_ICONERROR | MB_OK);
goto Exit;
}
int64_t PerfFrequency;
QueryPerformanceFrequency((LARGE_INTEGER*)&PerfFrequency);
// This is our global backbuffer onto which we will draw all of our graphics.
// This buffer gets drawn and blitted onto the screen 60 times per second.
// We don't have to worry about freeing the memory allocated for this buffer
// because it is intended to last throughout the entire lifetime of the process.
// Windows will automatically deallocate this memory when the game exits.
gBackBuffer.BitmapInfo.bmiHeader.biSize = sizeof(gBackBuffer.BitmapInfo.bmiHeader);
gBackBuffer.BitmapInfo.bmiHeader.biWidth = GAME_RES_WIDTH;
gBackBuffer.BitmapInfo.bmiHeader.biHeight = GAME_RES_HEIGHT;
gBackBuffer.BitmapInfo.bmiHeader.biBitCount = GAME_BPP;
gBackBuffer.BitmapInfo.bmiHeader.biCompression = BI_RGB;
gBackBuffer.BitmapInfo.bmiHeader.biPlanes = 1;
gBackBuffer.Memory = VirtualAlloc(NULL, GAME_DRAWING_AREA_MEMORY_SIZE, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
if (gBackBuffer.Memory == NULL)
{
ShowCursor(TRUE);
LogMessageA(LL_ERROR, "[%s] Failed to allocate memory for drawing surface! Error 0x%08lx!", __FUNCTION__, ERROR_NOT_ENOUGH_MEMORY);
MessageBoxA(NULL, "Failed to allocate memory for drawing surface!", "Error!", MB_ICONERROR | MB_OK);
goto Exit;
}
#ifdef _DEBUG
// If this is a debug build, initialize the memory for the backbuffer to 0xCC
// Incidentally, the byte 0xCC is also int 3, which is the CPU instruction that causes
// a debug break.
memset(gBackBuffer.Memory, 0xCC, GAME_DRAWING_AREA_MEMORY_SIZE);
#endif
ResetEverythingForNewGame();
// This is the main game loop. Setting gGameIsRunning to FALSE at any point will cause
// the game to exit immediately. The loop has two important functions: ProcessPlayerInput
// and RenderFrameGraphics. The loop will execute these two duties as quickly as possible,
// but will then sleep for a few milliseconds using a precise timing mechanism in order
// to achieve a smooth 60 frames per second. We also calculate some performance statistics
// every 2 seconds or 120 frames.
int64_t CurrentSystemTime;
while (gGameIsRunning == TRUE)
{
QueryPerformanceCounter((LARGE_INTEGER*)&FrameStart);
while (PeekMessageA(&Message, gGameWindow, 0, 0, PM_REMOVE))
{
DispatchMessageA(&Message);
}
ProcessPlayerInput();
RenderFrameGraphics();
QueryPerformanceCounter((LARGE_INTEGER*)&FrameEnd);
ElapsedMicroseconds = FrameEnd - FrameStart;
ElapsedMicroseconds *= 1000000;
ElapsedMicroseconds /= PerfFrequency;
gPerformanceData.TotalFramesRendered++;
ElapsedMicrosecondsAccumulatorRaw += ElapsedMicroseconds;
while (ElapsedMicroseconds < TARGET_MICROSECONDS_PER_FRAME)
{
ElapsedMicroseconds = FrameEnd - FrameStart;
ElapsedMicroseconds *= 1000000;
ElapsedMicroseconds /= PerfFrequency;
QueryPerformanceCounter((LARGE_INTEGER*)&FrameEnd);
// If we are less than 75% of the way through the current frame, then rest.
// Sleep(1) is only anywhere near 1 millisecond if we have previously set the global
// system timer resolution to 1ms or below using timeBeginPeriod.
if (ElapsedMicroseconds < (TARGET_MICROSECONDS_PER_FRAME * 0.75f))
{
Sleep(1);
}
}
ElapsedMicrosecondsAccumulatorCooked += ElapsedMicroseconds;
// Every CALCULATE_STATS_EVERY_X_FRAMES frames, we calculate some statistics such as average
// FPS, CPU usage, etc.
if ((gPerformanceData.TotalFramesRendered % CALCULATE_STATS_EVERY_X_FRAMES) == 0)
{
GetSystemTimeAsFileTime((FILETIME*)&CurrentSystemTime);
GetProcessTimes(GetCurrentProcess(),
&ProcessCreationTime,
&ProcessExitTime,
(FILETIME*)&CurrentKernelCPUTime,
(FILETIME*)&CurrentUserCPUTime);
gPerformanceData.CPUPercent = (double)(CurrentKernelCPUTime - PreviousKernelCPUTime) + (CurrentUserCPUTime - PreviousUserCPUTime);
gPerformanceData.CPUPercent /= (CurrentSystemTime - PreviousSystemTime);
gPerformanceData.CPUPercent /= SystemInfo.dwNumberOfProcessors;
gPerformanceData.CPUPercent *= 100;
GetProcessHandleCount(GetCurrentProcess(), &gPerformanceData.HandleCount);
PROCESS_MEMORY_COUNTERS_EX MemInfo;
K32GetProcessMemoryInfo(GetCurrentProcess(), (PROCESS_MEMORY_COUNTERS*)&MemInfo, sizeof(MemInfo));
gPerformanceData.MemoryUsage = MemInfo.PrivateUsage;
gPerformanceData.RawFPSAverage = 1.0f / (((float)ElapsedMicrosecondsAccumulatorRaw / CALCULATE_STATS_EVERY_X_FRAMES) * 0.000001f);
gPerformanceData.CookedFPSAverage = 1.0f / (((float)ElapsedMicrosecondsAccumulatorCooked / CALCULATE_STATS_EVERY_X_FRAMES) * 0.000001f);
FindFirstConnectedGamepad();
ElapsedMicrosecondsAccumulatorRaw = 0;
ElapsedMicrosecondsAccumulatorCooked = 0;
PreviousKernelCPUTime = CurrentKernelCPUTime;
PreviousUserCPUTime = CurrentUserCPUTime;
PreviousSystemTime = CurrentSystemTime;
}
}
Exit:
LogMessageA(LL_INFO, "[%s] Game is exiting.\r\n", __FUNCTION__);
// Set this just in case we failed before entering the main game loop,
// and the asset loading thread never got a chance to set it, which could
// hang us.
SetEvent(gEssentialAssetsLoadedEvent);
return(0);
}
// This callback procedure handles window messages that are sent to our game's window.
// Most of the messages are not important to us because we are not a conventional Win32 desktop app.
LRESULT CALLBACK MainWindowProc(_In_ HWND WindowHandle, _In_ UINT Message, _In_ WPARAM WParam, _In_ LPARAM LParam)
{
LRESULT Result = 0;
switch (Message)
{
// This happens when the user clicks the "X" button to close the window, or selects
// "Close Window" by right-clicking the game's icon in the taskbar.
case WM_CLOSE:
{
gGameIsRunning = FALSE;
PostQuitMessage(0);
break;
}
case WM_ACTIVATE:
{
if (WParam == 0)
{
// Our window has lost focus
gWindowHasFocus = FALSE;
}
else
{
// Our window has gained focus
ShowCursor(FALSE);
gWindowHasFocus = TRUE;
}
break;
}
default:
{
Result = DefWindowProcA(WindowHandle, Message, WParam, LParam);
}
}
return(Result);
}
//DWORD LoadGameCode(_In_ char* ModuleFileName)
//{
// DWORD Result = ERROR_SUCCESS;
//
// if (gGameCodeModule)
// {
// FreeLibrary(gGameCodeModule);
//
// gGameCodeModule = NULL;
// }
//
// if (GetFileAttributesA(GAME_CODE_MODULE_TMP) != INVALID_FILE_ATTRIBUTES)
// {
// if (DeleteFileA(GAME_CODE_MODULE) == 0)
// {
// LogMessageA(LL_WARNING, "[%s] Failed to delete file %s! Error 0x%08lx", __FUNCTION__, GAME_CODE_MODULE, GetLastError());
// }
// else
// {
// LogMessageA(LL_INFO, "[%s] Deleted file %s.", __FUNCTION__, GAME_CODE_MODULE);
// }
//
// if (MoveFileA(GAME_CODE_MODULE_TMP, GAME_CODE_MODULE) == 0)
// {
// LogMessageA(LL_WARNING, "[%s] Failed to replace file %s with file %s. Error 0x%08lx", __FUNCTION__, GAME_CODE_MODULE, GAME_CODE_MODULE_TMP, GetLastError());
// }
// else
// {
// LogMessageA(LL_INFO, "[%s] Renamed file %s to %s.", __FUNCTION__, GAME_CODE_MODULE_TMP, GAME_CODE_MODULE);
// }
// }
//
// gGameCodeModule = LoadLibraryA(ModuleFileName);
//
// if (gGameCodeModule == NULL)
// {
// Result = GetLastError();
//
// goto Exit;
// }
//
// if ((RandomMonsterEncounter = (_RandomMonsterEncounter)GetProcAddress(gGameCodeModule, "RandomMonsterEncounter")) == NULL)
// {
// Result = GetLastError();
//
// goto Exit;
// }
//
//Exit:
//
// if (Result == ERROR_SUCCESS)
// {
// LogMessageA(LL_INFO, "[%s] Successfully loaded code from module %s!", __FUNCTION__, GAME_CODE_MODULE);
// }
// else
// {
// LogMessageA(LL_ERROR, "[%s] Function failed with error 0x%08lx!", __FUNCTION__, Result);
// }
//
// return(Result);
//}
DWORD InitializeOpenGL(void)
{
#ifdef _WIN32
DWORD Result = ERROR_SUCCESS;
HDC WindowDC = GetDC(gGameWindow);
HGLRC OpenGLRenderContext = NULL;
int PixelFormatIndex = 0;
PIXELFORMATDESCRIPTOR PixelFormat = { sizeof(PIXELFORMATDESCRIPTOR) };
PixelFormat.nVersion = 1;
PixelFormat.iPixelType = PFD_TYPE_RGBA;
PixelFormat.dwFlags = PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW | PFD_DOUBLEBUFFER;
PixelFormat.cColorBits = 32;
PixelFormat.cAlphaBits = 8;
PixelFormat.iLayerType = PFD_MAIN_PLANE;
PixelFormatIndex = ChoosePixelFormat(WindowDC, &PixelFormat);
if (PixelFormatIndex == 0)
{
Result = GetLastError();
goto Exit;
}
DescribePixelFormat(WindowDC, PixelFormatIndex, sizeof(PIXELFORMATDESCRIPTOR), &PixelFormat);
SetPixelFormat(WindowDC, PixelFormatIndex, &PixelFormat);
OpenGLRenderContext = wglCreateContext(WindowDC);
if (OpenGLRenderContext == NULL)
{
Result = GetLastError();
goto Exit;
}
if (wglMakeCurrent(WindowDC, OpenGLRenderContext) == FALSE)
{
Result = GetLastError();
goto Exit;
}
// Try to enable v-sync. But if we can't don't fail. The player might have just disabled v-sync
// in their video card driver settings, and that's OK, that shouldn't prevent them from playing the game.
// We prefer v-sync but it's not required.
if (((BOOL(WINAPI*)(int))wglGetProcAddress("wglSwapIntervalEXT"))(1) == 0)
{
LogMessageA(LL_WARNING, "[%s] V-Sync was NOT enabled!", __FUNCTION__);
}
else
{
LogMessageA(LL_INFO, "[%s] V-Sync enabled.", __FUNCTION__);
}
Exit:
if (WindowDC)
{
ReleaseDC(gGameWindow, WindowDC);
}
if (Result == ERROR_SUCCESS)
{
LogMessageA(LL_INFO, "[%s] OpenGL successfully initialized.", __FUNCTION__);
}
return(Result);
#else
// LINUX
#endif
}
// TODO: Consider non-16:9 displays. E.g., ultra-wide monitors will have to have black bars on the sides,
// with the game center screen. The game itself has a 16:10 aspect ratio (resolution 384x240.)
DWORD CreateMainGameWindow(void)
{
DWORD Result = ERROR_SUCCESS;
WNDCLASSEXA WindowClass = { 0 };
WindowClass.cbSize = sizeof(WNDCLASSEXA);
WindowClass.style = 0;
WindowClass.lpfnWndProc = MainWindowProc;
WindowClass.cbClsExtra = 0;
WindowClass.cbWndExtra = 0;
WindowClass.hInstance = GetModuleHandleA(NULL);
WindowClass.hIcon = LoadIconA(NULL, IDI_APPLICATION);
WindowClass.hIconSm = LoadIconA(NULL, IDI_APPLICATION);
WindowClass.hCursor = LoadCursorA(NULL, IDC_ARROW);
WindowClass.hbrBackground = CreateSolidBrush(RGB(0, 0, 0));
WindowClass.lpszMenuName = NULL;
WindowClass.lpszClassName = GAME_NAME "_WINDOWCLASS";
// High DPI awareness is set in the application manifest, as recommended by MSDN.
// MSDN says it is not recommended to set this via code. However, if using a different
// compiler/IDE other than Visual Studio, adding a manifest file to the binary might be
// difficult. i.e. I don't know how to do it with Clang so when using Clang I set this via code:
#ifdef CLANG
if (SetProcessDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2) == FALSE)
{
Result = GetLastError();
LogMessageA(LL_ERROR, "[%s] SetProcessDpiAwarenessContext failed! Error 0x%08lx!", __FUNCTION__, Result);
goto Exit;
}
#endif
if (RegisterClassExA(&WindowClass) == 0)
{
Result = GetLastError();
LogMessageA(LL_ERROR, "[%s] RegisterClassExA failed! Error 0x%08lx!", __FUNCTION__, Result);
goto Exit;
}
gGameWindow = CreateWindowExA(0,
WindowClass.lpszClassName,
GAME_NAME,
WS_VISIBLE,
CW_USEDEFAULT,
CW_USEDEFAULT,
640,
480,
NULL,
NULL,
GetModuleHandleA(NULL),
NULL);
if (gGameWindow == NULL)
{
Result = GetLastError();
LogMessageA(LL_ERROR, "[%s] CreateWindowExA failed! Error 0x%08lx!", __FUNCTION__, Result);
goto Exit;
}
MONITORINFO MonitorInfo;
MonitorInfo.cbSize = sizeof(MONITORINFO);
if (GetMonitorInfoA(MonitorFromWindow(gGameWindow, MONITOR_DEFAULTTOPRIMARY), &MonitorInfo) == 0)
{
Result = ERROR_MONITOR_NO_DESCRIPTOR;
LogMessageA(LL_ERROR, "[%s] GetMonitorInfoA(MonitorFromWindow()) failed! Error 0x%08lx!", __FUNCTION__, Result);
goto Exit;
}
gPerformanceData.MonitorWidth = MonitorInfo.rcMonitor.right - MonitorInfo.rcMonitor.left;
gPerformanceData.MonitorHeight = MonitorInfo.rcMonitor.bottom - MonitorInfo.rcMonitor.top;
for (uint8_t Counter = 1; Counter < 12; Counter++)
{
if (GAME_RES_WIDTH * Counter > gPerformanceData.MonitorWidth ||
GAME_RES_HEIGHT * Counter > gPerformanceData.MonitorHeight)
{
gPerformanceData.MaxScaleFactor = Counter - 1;
break;
}
}
if (gRegistryParams.ScaleFactor == 0)
{
gPerformanceData.CurrentScaleFactor = gPerformanceData.MaxScaleFactor;
}
else
{
gPerformanceData.CurrentScaleFactor = (uint8_t)gRegistryParams.ScaleFactor;
}
// This can happen if for example the user has a laptop with a smaller screen,
// then docks the laptop into a docking station with a larger screen, then undocks
// the laptop again and plays on the smaller screen.
if (gPerformanceData.CurrentScaleFactor > gPerformanceData.MaxScaleFactor)
{
gPerformanceData.CurrentScaleFactor = gPerformanceData.MaxScaleFactor;
LogMessageA(LL_WARNING, "[%s] ScaleFactor read from the registry was larger than the maximum allowable scale factor according to your current monitor size. Resetting CurrentScaleFactor to match MaxScaleFactor.", __FUNCTION__);
}
LogMessageA(LL_INFO, "[%s] Current scale factor is %d. Max scale factor is %d. ",
__FUNCTION__,
gPerformanceData.CurrentScaleFactor,
gPerformanceData.MaxScaleFactor);
LogMessageA(LL_INFO, "[%s] Will draw at %dx%d.",
__FUNCTION__,
GAME_RES_WIDTH * gPerformanceData.CurrentScaleFactor,
GAME_RES_HEIGHT * gPerformanceData.CurrentScaleFactor);
if (SetWindowLongPtrA(gGameWindow, GWL_STYLE, WS_VISIBLE) == 0)
{
Result = GetLastError();
LogMessageA(LL_ERROR, "[%s] SetWindowLongPtrA failed! Error 0x%08lx!", __FUNCTION__, Result);
goto Exit;
}
if (SetWindowPos(gGameWindow,
HWND_TOP,
MonitorInfo.rcMonitor.left,
MonitorInfo.rcMonitor.top,
gPerformanceData.MonitorWidth,
gPerformanceData.MonitorHeight,
SWP_NOOWNERZORDER | SWP_FRAMECHANGED) == 0)
{
Result = GetLastError();
LogMessageA(LL_ERROR, "[%s] SetWindowPos failed! Error 0x%08lx!", __FUNCTION__, Result);
goto Exit;
}
Exit:
return(Result);
}
BOOL GameIsAlreadyRunning(void)
{
HANDLE Mutex = NULL;
Mutex = CreateMutexA(NULL, FALSE, GAME_NAME "_GameMutex");
if (GetLastError() == ERROR_ALREADY_EXISTS)
{
return(TRUE);
}
else
{
return(FALSE);
}
}
// Get the state of all player input here, including both keyboard key state as well as
// gamepad button state. The "gamepad unplugged" gamestate can also be triggered from here
// in case the gamepad is surprise removed. (e.g. tripping over the cord.)
// We capture the current state of each key and also the previous state of the keys from
// the previous frame. This allows us to tell when the button is being held down.
// Input is disabled when the game's window is out of focus, and for a brief moment during
// each gamestate transition/fade-out/fade-in. Even when player input is disabled though,
// we still want to get player input even though we don't act on it. Reason being is if
// we don't, we get an undesirable effect where motion is "queued up" when moving between
// input disabled and enabled states. For example, when the player enters a door, input is
// disabled and the player is frozen while we transition from outdoors to indoors, but we don't
// want the player to keep walking even though the player has taken their hands off the keys.
// TODO: Rename this to "CollectPlayerInput?"
void ProcessPlayerInput(void)
{
gGameInput.EscapeKeyIsDown = GetAsyncKeyState(VK_ESCAPE);
gGameInput.DebugKeyIsDown = GetAsyncKeyState(gRegistryParams.DebugKey);
gGameInput.LeftKeyIsDown = GetAsyncKeyState(VK_LEFT) | GetAsyncKeyState('A');
gGameInput.RightKeyIsDown = GetAsyncKeyState(VK_RIGHT) | GetAsyncKeyState('D');
gGameInput.UpKeyIsDown = GetAsyncKeyState(VK_UP) | GetAsyncKeyState('W');
gGameInput.DownKeyIsDown = GetAsyncKeyState(VK_DOWN) | GetAsyncKeyState('S');
gGameInput.ChooseKeyIsDown = GetAsyncKeyState(VK_RETURN);
gGameInput.InvKeyIsDown = GetAsyncKeyState(0x49); // The 'i' key
if (gGamepadID > -1)
{
if (XInputGetState(gGamepadID, &gGamepadState) == ERROR_SUCCESS)
{
gGameInput.EscapeKeyIsDown |= gGamepadState.Gamepad.wButtons & XINPUT_GAMEPAD_BACK;
gGameInput.LeftKeyIsDown |= gGamepadState.Gamepad.wButtons & XINPUT_GAMEPAD_DPAD_LEFT;
gGameInput.RightKeyIsDown |= gGamepadState.Gamepad.wButtons & XINPUT_GAMEPAD_DPAD_RIGHT;
gGameInput.UpKeyIsDown |= gGamepadState.Gamepad.wButtons & XINPUT_GAMEPAD_DPAD_UP;
gGameInput.DownKeyIsDown |= gGamepadState.Gamepad.wButtons & XINPUT_GAMEPAD_DPAD_DOWN;
gGameInput.ChooseKeyIsDown |= gGamepadState.Gamepad.wButtons & XINPUT_GAMEPAD_A;
gGameInput.InvKeyIsDown |= gGamepadState.Gamepad.wButtons & XINPUT_GAMEPAD_Y;