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0a89186e209d5898e904d22f7534a677398e3c30
handmadehero/sdl_handmade.c
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ikolokolnikov 0a89186e20 Added a program icon.
2026-04-06 19:25:37 -07:00

1197 lines
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/* NOTE: This layer only supports MacOS and Linux, for now. */
#include "core.h"
#include "handmade.h"
#include "sdl_handmade.h"
#include <SDL.h>
#include <sys/mman.h> /* mmap */
#include <stdlib.h> /* malloc, calloc */
#include <string.h> /* memset, memcpy */
#include <stdio.h>
#include <sys/stat.h> /* fstat */
#include <fcntl.h> /* open */
#include <unistd.h> /* close, write, read, readlink, unlink */
#include <dlfcn.h> /* dlopen */
#include <sys/stat.h> /* stat */
#if __APPLE__ && __MACH__
#include <mach-o/dyld.h> /* _NSGetExecutablePath */
#endif
/* NOTE: This is so it compiles on ARM. */
#if __x86_64__ || __i386__
#include <x86intrin.h>
#endif
#include "program_icon.c"
#define RESOLUTION_WIDTH 960
#define RESOLUTION_HEIGHT 540
static B32 GlobalRunning;
static U64 GlobalPerfCountFrequency;
#define CONTROLLER_LEFT_THUMB_DEADZONE 8000
#define MAX_CONTROLLERS 4
SDL_GameController *ControllerHandles[MAX_CONTROLLERS];
static offscreen_buffer GlobalBackbuffer;
static S32 str_len(char *str)
{
S32 count = 0;
while(*str++)
count++;
return count;
}
static U32 SafeTruncateUInt64(U64 Value)
{
U32 Result;
ASSERT(Value <= 0xFFFFFFFF);
Result = (U32)Value;
return Result;
}
debug_read_file_result DEBUGPlatformReadEntireFile(thread_context *Thread,
const char *Filename)
{
debug_read_file_result Result;
S32 FileHandle;
struct stat FileStatus;
U32 BytesToRead;
U8 *NextByteLocation;
memset(&Result, 0, sizeof(Result));
FileHandle = open(Filename, O_RDONLY);
if(FileHandle == -1) {
return Result;
}
if(fstat(FileHandle, &FileStatus) == -1) {
close(FileHandle);
return Result;
}
Result.ContentsSize = SafeTruncateUInt64(FileStatus.st_size);
Result.Contents = malloc(Result.ContentsSize);
if(!Result.Contents) {
Result.ContentsSize = 0;
close(FileHandle);
return Result;
}
BytesToRead = Result.ContentsSize;
NextByteLocation = (U8 *)Result.Contents;
while(BytesToRead) {
U32 BytesRead;
BytesRead = read(FileHandle, NextByteLocation, BytesToRead);
if(BytesRead == (U32)-1) {
free(Result.Contents);
Result.Contents = 0;
Result.ContentsSize = 0;
close(FileHandle);
return Result;
}
BytesToRead -= BytesRead;
NextByteLocation += BytesRead;
}
close(FileHandle);
return Result;
}
B32 DEBUGPlatformWriteEntireFile(thread_context *Thread,
const char *Filename, U32 MemorySize,
void *Memory)
{
S32 FileHandle;
U32 BytesToWrite;
U8 *NextByteLocation;
FileHandle = open(Filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR |
S_IRGRP | S_IROTH);
if(FileHandle == -1)
return FALSE;
BytesToWrite = MemorySize;
NextByteLocation = (U8*)Memory;
while(BytesToWrite) {
U32 BytesWritten;
BytesWritten = write(FileHandle, NextByteLocation, BytesToWrite);
if(BytesWritten == (U32)-1) {
close(FileHandle);
return FALSE;
}
BytesToWrite -= BytesWritten;
NextByteLocation += BytesWritten;
}
close(FileHandle);
return TRUE;
}
void DEBUGPlatformFreeFileMemory(thread_context *Thread, void *Memory)
{
if(Memory)
free(Memory);
}
static sdl_window_dimension SDLGetWindowDimension(SDL_Window *Window)
{
sdl_window_dimension Dimension;
SDL_GetWindowSize(Window, &Dimension.Width, &Dimension.Height);
return Dimension;
}
static void SDLResizeTexture(offscreen_buffer *Buffer,
SDL_Renderer *Renderer, int Width, int Height)
{
S32 BytesPerPixel;
if(Buffer->Texture)
SDL_DestroyTexture(Buffer->Texture);
if(Buffer->Memory)
free(Buffer->Memory);
BytesPerPixel = 4;
Buffer->Texture = SDL_CreateTexture(Renderer, SDL_PIXELFORMAT_ARGB8888,
SDL_TEXTUREACCESS_STREAMING,
Width, Height);
Buffer->Memory = malloc(Width * Height * BytesPerPixel);
Buffer->Height = Height;
Buffer->Width = Width;
Buffer->Pitch = Width * BytesPerPixel;
}
static void SDLDisplayBufferInWindow(offscreen_buffer Buffer,
SDL_Window *Window,
SDL_Renderer *Renderer)
{
SDL_Rect dest_rect;
S32 OffsetX = 10;
S32 OffsetY = 10;
SDL_SetRenderDrawColor(Renderer, 0, 0, 0, 255);
SDL_RenderClear(Renderer);
if(SDL_UpdateTexture(Buffer.Texture, 0, Buffer.Memory, Buffer.Pitch)) {
/* TODO: Do something about this error! */
}
/* TODO: We temporarily introduce the target rectangle to avoid
* stretching the canvas. */
/* SDL_RenderCopy(Renderer, Buffer.Texture, 0, 0); */
dest_rect.x = OffsetX;
dest_rect.y = OffsetY;
dest_rect.w = RESOLUTION_WIDTH;
dest_rect.h = RESOLUTION_HEIGHT;
SDL_RenderCopy(Renderer, Buffer.Texture, 0, (const SDL_Rect *)(&dest_rect));
SDL_RenderPresent(Renderer);
}
static void SDLInitControllers()
{
S32 MaxJoysticks, ControllerIndex, JoystickIndex;
MaxJoysticks = SDL_NumJoysticks();
ControllerIndex = 0;
for(JoystickIndex = 0; JoystickIndex < MaxJoysticks; JoystickIndex++) {
if(!SDL_IsGameController(JoystickIndex))
continue;
if(ControllerIndex >= MAX_CONTROLLERS)
break;
ControllerHandles[ControllerIndex] =
SDL_GameControllerOpen(JoystickIndex);
ControllerIndex++;
}
}
/*
static void SDLDeinitControllers()
{
S32 ControllerIndex;
for(ControllerIndex = 0;
ControllerIndex < MAX_CONTROLLERS;
ControllerIndex++)
{
if(ControllerHandles[ControllerIndex])
SDL_GameControllerClose(ControllerHandles[ControllerIndex]);
}
}
*/
static void SDLInitSound(S32 SamplesPerSecond, S32 BufferSize)
{
SDL_AudioSpec AudioSettings;
memset(&AudioSettings, 0, sizeof(AudioSettings));
AudioSettings.freq = SamplesPerSecond;
AudioSettings.format = AUDIO_S16LSB;
AudioSettings.channels = 2;
AudioSettings.samples = BufferSize;
SDL_OpenAudio(&AudioSettings, 0);
if(AudioSettings.format != AUDIO_S16LSB) {
SDL_CloseAudio();
}
}
static void SDLFillSoundBuffer(sdl_sound_output *SoundOutput,
S32 BytesToWrite)
{
SDL_QueueAudio(1, SoundOutput->Samples, BytesToWrite);
}
static void SDLClearSoundBuffer(sdl_sound_output *SoundOutput)
{
memset(SoundOutput->Samples, 0, SoundOutput->SecondaryBufferSize);
}
static void SDLProcessKeyboardMessage(game_button_state *NewState,
B32 IsDown)
{
if(NewState->EndedDown != IsDown) {
NewState->EndedDown = IsDown;
++NewState->HalfTransitionCount;
}
}
static void SDLProcessInputDigitalButton(SDL_GameController *Controller,
game_button_state *OldState,
SDL_GameControllerButton Button,
game_button_state *NewState)
{
NewState->EndedDown = SDL_GameControllerGetButton(Controller, Button);
NewState->HalfTransitionCount =
(OldState->EndedDown != NewState->EndedDown) ? 1 : 0;
}
static void HandleEvent(SDL_Event *Event)
{
/* TODO: Should this be below scopes? */
SDL_Window *Window;
SDL_Renderer *Renderer;
Window = SDL_GetWindowFromID(Event->window.windowID);
Renderer = SDL_GetRenderer(Window);
switch(Event->type) {
case SDL_QUIT: {
GlobalRunning = FALSE;
} break;
case SDL_WINDOWEVENT: {
switch(Event->window.event) {
/* TODO: We temporarily disable for ease of writing the
* rendering code. */
#if 0
case SDL_WINDOWEVENT_SIZE_CHANGED: {
sdl_window_dimension Dimension;
Dimension = SDLGetWindowDimension(Window);
/* TODO: For now we fix the width and height. */
SDLResizeTexture(&GlobalBackbuffer, Renderer,
Dimension.Width, Dimension.Height);
} break;
#endif
case SDL_WINDOWEVENT_EXPOSED: {
} break;
case SDL_WINDOWEVENT_FOCUS_GAINED: {
if(SDL_SetWindowOpacity(Window, 1.0f) != 0) {
/* TODO: This didn't work . . . SDL_GetError() */
}
} break;
case SDL_WINDOWEVENT_FOCUS_LOST: {
if(SDL_SetWindowOpacity(Window, 0.3f) != 0) {
/* TODO: This didn't work . . . SDL_GetError() */
}
} break;
}
} break;
}
}
static void SDLGetInputFileLocation(sdl_state *SDLState, char *path,
size_t path_size, S32 SlotIndex)
{
const char *file_name = "loop.hmi";
ASSERT(SlotIndex == 1);
snprintf(path, path_size, "%s%s", SDLState->EXEDirPath, file_name);
}
sdl_replay_buffer *SDLGetReplayBuffer(sdl_state *SDLState,
S32 Index)
{
ASSERT(Index < (S32)ARRAY_SIZE(SDLState->ReplayBuffers));
return &(SDLState->ReplayBuffers[Index]);
}
static void SDLBeginRecordingInput(sdl_state *SDLState,
S32 InputRecordingIndex)
{
sdl_replay_buffer *ReplayBuffer =
SDLGetReplayBuffer(SDLState, InputRecordingIndex);
if(ReplayBuffer->MemoryBlock) {
char FileName[SDL_STATE_PATH_SIZE];
SDLGetInputFileLocation(SDLState, FileName, sizeof(FileName),
InputRecordingIndex);
SDLState->InputRecordingIndex = InputRecordingIndex;
if(unlink(FileName) != 0) {
/* TODO: Diagnostics . . . */
}
SDLState->RecordingHandle =
open(FileName, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR |
S_IRGRP | S_IROTH);
/* write(SDLState->RecordingHandle, SDLState->GameMmemoryBlock,
(size_t)(SDLState->TotalSize)); */
memcpy(ReplayBuffer->MemoryBlock, SDLState->GameMmemoryBlock,
(size_t)(SDLState->TotalSize));
}
}
static void SDLEndRecordingInput(sdl_state *SDLState)
{
close(SDLState->RecordingHandle);
SDLState->InputRecordingIndex = 0;
}
static void SDLBeginInputPlayback(sdl_state *SDLState,
S32 InputPlayingIndex)
{
sdl_replay_buffer *ReplayBuffer =
SDLGetReplayBuffer(SDLState, InputPlayingIndex);
if(ReplayBuffer->MemoryBlock) {
char FileName[SDL_STATE_PATH_SIZE];
ssize_t size;
SDLGetInputFileLocation(SDLState, FileName, sizeof(FileName),
InputPlayingIndex);
SDLState->InputPlayingIndex = InputPlayingIndex;
SDLState->PlaybackHandle =
open(FileName, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR |
S_IRGRP | S_IROTH);
/* size = read(SDLState->PlaybackHandle, SDLState->GameMmemoryBlock,
(size_t)(SDLState->TotalSize)); */
memcpy(SDLState->GameMmemoryBlock, ReplayBuffer->MemoryBlock,
(size_t)(SDLState->TotalSize));
}
}
static void SDLEndInputPlayback(sdl_state *SDLState)
{
close(SDLState->PlaybackHandle);
SDLState->InputPlayingIndex = 0;
}
static void SDLRecordInput(sdl_state *SDLState, game_input *NewInput)
{
write(SDLState->RecordingHandle, NewInput, sizeof(*NewInput));
}
static void SDLPlaybackInput(sdl_state *SDLState, game_input *NewInput)
{
ssize_t size;
size = read(SDLState->PlaybackHandle, NewInput, sizeof(*NewInput));
if(size == 0 || size == -1) {
S32 PlayingIndex;
PlayingIndex = SDLState->InputPlayingIndex;
SDLEndInputPlayback(SDLState);
SDLBeginInputPlayback(SDLState, PlayingIndex);
size = read(SDLState->PlaybackHandle, NewInput, sizeof(*NewInput));
}
}
static void SDLProcessMessages(sdl_state *SDLState,
game_controller_input *KeyboardController)
{
SDL_Event Event;
while(SDL_PollEvent(&Event)) {
switch(Event.type) {
case SDL_KEYDOWN:
case SDL_KEYUP: {
SDL_Keycode KeyCode;
B32 IsDown, WasDown;
KeyCode = Event.key.keysym.sym;
IsDown = (Event.key.state == SDL_PRESSED);
WasDown = FALSE;
if(Event.key.state == SDL_RELEASED) {
WasDown = TRUE;
} else if(Event.key.repeat != 0) {
WasDown = TRUE;
}
if(Event.key.repeat == 0) {
if(KeyCode == SDLK_w) {
SDLProcessKeyboardMessage(
&KeyboardController->u.buttons.MoveUp,
IsDown);
} else if(KeyCode == SDLK_s) {
SDLProcessKeyboardMessage(
&KeyboardController->u.buttons.MoveDown,
IsDown);
} else if(KeyCode == SDLK_a) {
SDLProcessKeyboardMessage(
&KeyboardController->u.buttons.MoveLeft,
IsDown);
} else if(KeyCode == SDLK_d) {
SDLProcessKeyboardMessage(
&KeyboardController->u.buttons.MoveRight,
IsDown);
} else if(KeyCode == SDLK_q) {
SDLProcessKeyboardMessage(
&KeyboardController->u.buttons.LeftShoulder,
IsDown);
} else if(KeyCode == SDLK_e) {
SDLProcessKeyboardMessage(
&KeyboardController->u.buttons.RightShoulder,
IsDown);
} else if(KeyCode == SDLK_UP) {
SDLProcessKeyboardMessage(
&KeyboardController->u.buttons.ActionUp,
IsDown);
} else if(KeyCode == SDLK_DOWN) {
SDLProcessKeyboardMessage(
&KeyboardController->u.buttons.ActionDown,
IsDown);
} else if(KeyCode == SDLK_LEFT) {
SDLProcessKeyboardMessage(
&KeyboardController->u.buttons.ActionLeft,
IsDown);
} else if(KeyCode == SDLK_RIGHT) {
SDLProcessKeyboardMessage(
&KeyboardController->u.buttons.ActionRight,
IsDown);
} else if(KeyCode == SDLK_ESCAPE) {
SDLProcessKeyboardMessage(
&KeyboardController->u.buttons.Start,
IsDown);
} else if(KeyCode == SDLK_SPACE) {
SDLProcessKeyboardMessage(
&KeyboardController->u.buttons.Back,
IsDown);
}
}
if(WasDown) {
B32 AltKeyWasDown;
#if BUILD_INTERNAL
if(KeyCode == SDLK_l) {
if(SDLState->InputPlayingIndex == 0) {
if(SDLState->InputRecordingIndex == 0) {
SDLBeginRecordingInput(SDLState, 1);
} else {
SDLEndRecordingInput(SDLState);
SDLBeginInputPlayback(SDLState, 1);
}
} else {
SDLEndInputPlayback(SDLState);
}
}
#endif
/* NOTE: If your window manager already uses an Alt+F4
* keybind to close programs, then we are likely
* to see SDL_QUIT event occur before our
* keybind. */
AltKeyWasDown = (Event.key.keysym.mod & KMOD_ALT);
if(KeyCode == SDLK_F4 && AltKeyWasDown)
GlobalRunning = FALSE;
#if BUILD_INTERNAL
if(KeyCode == SDLK_ESCAPE)
GlobalRunning = FALSE;
#endif
}
} break;
default: {
HandleEvent(&Event);
} break;
}
}
}
static F32 SDLProcessInputStickValue(F32 Value, S32 DeadZoneThreshold)
{
F32 Result;
Result = 0.0f;
if(Value < -DeadZoneThreshold)
Result = (F32)((Value + DeadZoneThreshold) /
(32768.0f - DeadZoneThreshold));
else if(Value > DeadZoneThreshold)
Result = (F32)((Value + DeadZoneThreshold) /
(32767.0f - DeadZoneThreshold));
return Result;
}
#define DEFAULT_REFRESH_RATE 60
static S32 SDLGetWindowRefreshRate(SDL_Window *Window)
{
S32 DisplayIndex;
SDL_DisplayMode Mode;
DisplayIndex = SDL_GetWindowDisplayIndex(Window);
if(SDL_GetDesktopDisplayMode(DisplayIndex, &Mode) != 0)
return DEFAULT_REFRESH_RATE;
if(Mode.refresh_rate == 0)
return DEFAULT_REFRESH_RATE;
return Mode.refresh_rate;
}
static U64 SDLGetWallClock()
{
return SDL_GetPerformanceCounter();
}
static F32 SDLGetSecondsElapsed(U64 Start, U64 End)
{
return (F32)(End - Start) / (F32)GlobalPerfCountFrequency;
}
typedef struct sdl_game_code {
void *GameCodeDLL;
U32 DLLLastWriteTime;
void (*UpdateAndRender)(thread_context *Thread, game_memory *,
game_input *, game_offscreen_buffer *,
game_sound_output_buffer *);
B32 IsValid;
} sdl_game_code;
static U32 GetLastWriteTime(const char *FileName)
{
struct stat file_info;
memset(&file_info, 0, sizeof(file_info));
if(stat(FileName, &file_info) != 0) {
/* TODO: Diagnostic. perror("stat failed"); */
perror("stat failed");
}
return (U32)file_info.st_mtime;
}
#define GAME_DLL_NAME "libhandmade.so"
static sdl_game_code SDLLoadGameCode(char *DLLPath)
{
sdl_game_code Result;
memset(&Result, 0, sizeof(Result));
Result.GameCodeDLL = dlopen(DLLPath, RTLD_NOW);
if(Result.GameCodeDLL) {
Result.DLLLastWriteTime = GetLastWriteTime(DLLPath);
Result.UpdateAndRender =
(void(*)(thread_context *, game_memory *, game_input *,
game_offscreen_buffer *, game_sound_output_buffer *))
dlsym(Result.GameCodeDLL, "UpdateAndRender");
if(!Result.UpdateAndRender) {
/* TODO: Diagnostic. dlerror() */
}
Result.IsValid = Result.UpdateAndRender ? TRUE : FALSE;
} else {
/* TODO: Diagnostic. dlerror() */
}
if(!Result.IsValid) {
Result.UpdateAndRender = NULL;
}
return Result;
}
static void SDLUnloadGameCode(sdl_game_code *GameCode)
{
if(GameCode->GameCodeDLL)
dlclose(GameCode->GameCodeDLL); /* NOTE: Might fail. */
GameCode->IsValid = FALSE;
GameCode->UpdateAndRender = NULL;
}
void GetExecutablePath(char *path, size_t path_size)
{
#if __APPLE__ && __MACH__
U32 size;
#else
ssize_t size;
#endif
if(path_size > 0) {
path[0] = '\0';
#if __APPLE__ && __MACH__
size = path_size;
if(_NSGetExecutablePath(path, &size) != 0) { /* NOTE: Not an
absolute
path. */
/* TODO: Diagnostics. */
}
#else
size = readlink("/proc/self/exe", path, path_size - 1);
if(size != -1) {
path[size] = '\0';
} else {
/* TODO: Diagnostics. */
}
#endif
}
}
static void SDLGetEXEDirPath(char *path, size_t path_size)
{
U32 len, i;
GetExecutablePath(path, path_size);
len = str_len(path);
i = len;
while(path[i] != '/' || i == 0) {
i--;
}
path[i+1] = '\0';
}
static void SDLGetDLLPath(char *path, size_t path_size, char *exe_path)
{
snprintf(path, path_size, "%s%s", exe_path, GAME_DLL_NAME);
}
#if !(__x86_64__ || __i386__)
U64 __rdtsc()
{
return 0;
}
#endif
S32 main(S32 argc, char *argv[])
{
sdl_state SDLState;
SDL_Window *Window;
memset(&SDLState, 0, sizeof(SDLState));
SDLGetEXEDirPath(SDLState.EXEDirPath, sizeof(SDLState.EXEDirPath));
SDLGetDLLPath(SDLState.DLLPath, sizeof(SDLState.DLLPath),
SDLState.EXEDirPath);
if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_GAMECONTROLLER |
SDL_INIT_AUDIO))
{
/* TODO: This didn't work . . . */
}
SDLInitControllers();
/* NOTE: Floating windows are not supported oficially by Wayland
* protocol. However, SDL_WINDOW_ALWAYS_ON_TOP does work on KDE
* under Wayland. I have not tested GNOME. */
Window = SDL_CreateWindow("Handmade Hero", SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
RESOLUTION_WIDTH, RESOLUTION_HEIGHT,
SDL_WINDOW_RESIZABLE |
SDL_WINDOW_ALWAYS_ON_TOP);
if(Window) {
SDL_Renderer *Renderer;
SDL_Surface* icon;
Uint32 rmask, gmask, bmask, amask;
SDL_DisplayMode display_mode;
SDL_GetCurrentDisplayMode(0, &display_mode);
Renderer = SDL_CreateRenderer(Window, -1, SDL_RENDERER_PRESENTVSYNC);
SDL_SetWindowPosition(Window, (display_mode.w - RESOLUTION_WIDTH),
(display_mode.h - RESOLUTION_HEIGHT));
/* Set program icon. */
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
int shift = (program_icon.bytes_per_pixel == 3) ? 8 : 0;
rmask = 0xff000000 >> shift;
gmask = 0x00ff0000 >> shift;
bmask = 0x0000ff00 >> shift;
amask = 0x000000ff >> shift;
#else
rmask = 0x000000ff;
gmask = 0x0000ff00;
bmask = 0x00ff0000;
amask = (program_icon.bytes_per_pixel == 3) ? 0 : 0xff000000;
#endif
icon = SDL_CreateRGBSurfaceFrom(
(void *)program_icon.pixel_data,
program_icon.width, program_icon.height,
program_icon.bytes_per_pixel * 8,
program_icon.bytes_per_pixel * program_icon.width,
rmask, gmask, bmask, amask);
SDL_SetWindowIcon(Window, icon);
SDL_FreeSurface(icon);
/* "Wayland needs an event loop and rendering or it won't function."
* https://github.com/libsdl-org/SDL/issues/7699#issuecomment-1545684792 */
/* NOTE: This means that we need to readraw to even resize the
* window, otherwise the window frame will appear outdated to
* its actual size. */
/* SDL_RenderPresent(Renderer) is enough to display the window. */
if(Renderer) {
sdl_window_dimension Dimension;
sdl_sound_output SoundOutput;
game_memory GameMemory;
S32 ReplayIndex;
#if BUILD_DEBUG
void *BaseAddress = (void *)TB(2);
#else
void *BaseAddress = (void *)(0);
#endif
GlobalRunning = TRUE;
Dimension = SDLGetWindowDimension(Window);
SDLResizeTexture(&GlobalBackbuffer, Renderer, Dimension.Width,
Dimension.Height);
memset(&SoundOutput, 0, sizeof(SoundOutput));
SoundOutput.SamplesPerSecond = 48000;
SoundOutput.BytesPerSample = sizeof(S16) * 2;
SoundOutput.SecondaryBufferSize =
SoundOutput.SamplesPerSecond * SoundOutput.BytesPerSample;
SoundOutput.tSine = 0;
SoundOutput.LatencySampleCount =
SoundOutput.SamplesPerSecond / 15;
SDLInitSound(SoundOutput.SamplesPerSecond,
SoundOutput.SamplesPerSecond * SoundOutput.BytesPerSample /
60);
SDL_PauseAudio(0);
SoundOutput.Samples =
calloc(SoundOutput.SamplesPerSecond,
SoundOutput.BytesPerSample);
/* SoundOutput.Samples =
* malloc(SoundOutput.SecondaryBufferSize); */
/* NOTE: calloc auto clears to zero */
/* SDLClearSoundBuffer(&SoundOutput); */
memset(&GameMemory, 0, sizeof(GameMemory));
GameMemory.PermanentStorageSize = MB(64);
GameMemory.TransientStorageSize = GB(1);
GameMemory.DEBUGPlatformReadEntireFile =
&DEBUGPlatformReadEntireFile;
GameMemory.DEBUGPlatformWriteEntireFile =
&DEBUGPlatformWriteEntireFile;
GameMemory.DEBUGPlatformFreeFileMemory =
&DEBUGPlatformFreeFileMemory;
SDLState.TotalSize =
GameMemory.PermanentStorageSize +
GameMemory.TransientStorageSize;
/* NOTE: On MacOS and Linux, mmap seems to zero-fill anonymous
* memory as a side-effect of security. */
SDLState.GameMmemoryBlock =
mmap(BaseAddress, (size_t)SDLState.TotalSize, PROT_READ |
PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
GameMemory.PermanentStorage = SDLState.GameMmemoryBlock;
GameMemory.TransientStorage =
(U8 *)(GameMemory.PermanentStorage) +
GameMemory.PermanentStorageSize;
for(ReplayIndex = 0;
ReplayIndex < (S32)ARRAY_SIZE(SDLState.ReplayBuffers);
ReplayIndex++)
{
sdl_replay_buffer *ReplayBuffer =
&SDLState.ReplayBuffers[ReplayIndex];
ReplayBuffer->MemoryBlock = mmap(NULL,
(size_t)SDLState.TotalSize,
PROT_READ | PROT_WRITE,
MAP_ANON | MAP_PRIVATE,
-1, 0);
if(ReplayBuffer->MemoryBlock) {
} else {
/* TODO: Change this to log message. */
}
}
if(SoundOutput.Samples &&
GameMemory.PermanentStorage &&
GameMemory.TransientStorage)
{
game_input Input[2];
game_input *NewInput, *OldInput;
sdl_game_code Game;
F32 TargetSecondsPerFrame;
S32 MonitorRefreshHz, GameUpdateHz;
U64 LastCounter;
U64 LastCycleCount;
MonitorRefreshHz = SDLGetWindowRefreshRate(Window);
/*GameUpdateHz = MonitorRefreshHz;*/
GameUpdateHz = 30; /* NOTE: Temporarily target 30 FPS. */
TargetSecondsPerFrame = 1.0f / (F32)GameUpdateHz;
NewInput = &Input[0];
OldInput = &Input[1];
memset(&Input, 0, sizeof(Input));
GlobalPerfCountFrequency = SDL_GetPerformanceFrequency();
Game = SDLLoadGameCode(SDLState.DLLPath);
while(GlobalRunning) {
thread_context Context;
U32 NewDLLWriteTime, ButtonIndex, ControllerIndex,
SDLMouseButtons;
game_controller_input *OldKeyboardController,
*NewKeyboardController;
game_controller_input ZeroController;
S32 TargetQueueBytes, BytesToWrite;
game_sound_output_buffer SoundBuffer;
game_offscreen_buffer Buffer;
U64 WorkCounter, EndCounter;
F32 WorkSecondsElapsed, SecondsElapsedForFrame;
F64 MSPerFrame, FPS;
U64 EndCycleCount, CyclesElapsed;
F64 MCPF;
NewInput->dtForFrame = TargetSecondsPerFrame;
LastCounter = SDLGetWallClock();
/* NOTE: rdtsc reports clock cylces, however it is not
* meant for really precise profiler work as the
* value returned is varied. */
/* Also, __rdtsc is not available on MacOS ARM; I
* have not checked MacOS x64. */
LastCycleCount = __rdtsc();
NewDLLWriteTime = GetLastWriteTime(SDLState.DLLPath);
if(NewDLLWriteTime > Game.DLLLastWriteTime) {
SDLUnloadGameCode(&Game);
Game = SDLLoadGameCode(SDLState.DLLPath);
}
SDLMouseButtons = SDL_GetMouseState(&(NewInput->MouseX),
&(NewInput->MouseY));
NewInput->MouseZ = 0; /* TODO: Support mouse wheel? */
SDLProcessKeyboardMessage(&(NewInput->MouseButtons[0]),
SDL_BUTTON_LMASK & SDLMouseButtons);
SDLProcessKeyboardMessage(&(NewInput->MouseButtons[1]),
SDL_BUTTON_MMASK & SDLMouseButtons);
SDLProcessKeyboardMessage(&(NewInput->MouseButtons[2]),
SDL_BUTTON_RMASK & SDLMouseButtons);
/* WARNING: TODO: SDL_BUTTON_X1MASK and
* SDL_BUTTON_X2MASK cannot be on at the
* same time for some reason. */
SDLProcessKeyboardMessage(&(NewInput->MouseButtons[3]),
SDL_BUTTON_X1MASK & SDLMouseButtons);
SDLProcessKeyboardMessage(&(NewInput->MouseButtons[4]),
SDL_BUTTON_X2MASK & SDLMouseButtons);
OldKeyboardController = GetController(OldInput, 0);
NewKeyboardController = GetController(NewInput, 0);
memset(&ZeroController, 0, sizeof(ZeroController));
*NewKeyboardController = ZeroController;
NewKeyboardController->IsConnected = TRUE;
for(ButtonIndex = 0;
ButtonIndex < ARRAY_SIZE(
NewKeyboardController->u.Buttons);
ButtonIndex++)
{
NewKeyboardController->
u.Buttons[ButtonIndex].EndedDown =
OldKeyboardController->
u.Buttons[ButtonIndex].
EndedDown;
}
SDLProcessMessages(&SDLState, NewKeyboardController);
for(ControllerIndex = 0;
ControllerIndex < MAX_CONTROLLERS;
ControllerIndex++)
{
game_controller_input *OldController, *NewController;
OldController =
GetController(OldInput, ControllerIndex+1);
NewController =
GetController(NewInput, ControllerIndex+1);
if(ControllerHandles[ControllerIndex] != 0 &&
SDL_GameControllerGetAttached(
ControllerHandles[ControllerIndex]))
{
S16 StickX, StickY;
float Threshold;
NewController->IsAnalog =
OldController->IsAnalog;
NewController->IsConnected = TRUE;
StickX =
SDL_GameControllerGetAxis(
ControllerHandles[ControllerIndex],
SDL_CONTROLLER_AXIS_LEFTX);
StickY =
SDL_GameControllerGetAxis(
ControllerHandles[ControllerIndex],
SDL_CONTROLLER_AXIS_LEFTY);
NewController->IsAnalog = TRUE;
NewController->StickAverageX =
SDLProcessInputStickValue((F32)StickX,
CONTROLLER_LEFT_THUMB_DEADZONE);
NewController->StickAverageY =
SDLProcessInputStickValue((F32)StickY,
CONTROLLER_LEFT_THUMB_DEADZONE);
if((NewController->StickAverageX != 0.0f) ||
(NewController->StickAverageY != 0.0f))
{
NewController->IsAnalog = TRUE;
}
if(SDL_GameControllerGetButton(
ControllerHandles[ControllerIndex],
SDL_CONTROLLER_BUTTON_DPAD_UP))
{
NewController->StickAverageY = -1.0f;
NewController->IsAnalog = FALSE;
}
if(SDL_GameControllerGetButton(
ControllerHandles[ControllerIndex],
SDL_CONTROLLER_BUTTON_DPAD_DOWN))
{
NewController->StickAverageY = 1.0f;
NewController->IsAnalog = FALSE;
}
if(SDL_GameControllerGetButton(
ControllerHandles[ControllerIndex],
SDL_CONTROLLER_BUTTON_DPAD_LEFT))
{
NewController->StickAverageX = -1.0f;
NewController->IsAnalog = FALSE;
}
if(SDL_GameControllerGetButton(
ControllerHandles[ControllerIndex],
SDL_CONTROLLER_BUTTON_DPAD_RIGHT))
{
NewController->StickAverageX = 1.0f;
NewController->IsAnalog = FALSE;
}
Threshold = 0.5f;
SDLProcessInputDigitalButton(
ControllerHandles[
(NewController->StickAverageY <
-Threshold) ? 1 : 0],
&OldController->u.buttons.MoveUp,
SDL_CONTROLLER_BUTTON_A,
&NewController->u.buttons.MoveUp);
SDLProcessInputDigitalButton(
ControllerHandles[
(NewController->StickAverageY >
Threshold) ? 1 : 0],
&OldController->u.buttons.MoveDown,
SDL_CONTROLLER_BUTTON_A,
&NewController->u.buttons.MoveDown);
SDLProcessInputDigitalButton(
ControllerHandles[
(NewController->StickAverageX <
-Threshold) ? 1 : 0],
&OldController->u.buttons.MoveLeft,
SDL_CONTROLLER_BUTTON_A,
&NewController->u.buttons.MoveLeft);
SDLProcessInputDigitalButton(
ControllerHandles[
(NewController->StickAverageX >
Threshold) ? 1 : 0],
&OldController->u.buttons.MoveRight,
SDL_CONTROLLER_BUTTON_A,
&NewController->u.buttons.MoveRight);
SDLProcessInputDigitalButton(
ControllerHandles[ControllerIndex],
&OldController->u.buttons.ActionDown,
SDL_CONTROLLER_BUTTON_A,
&NewController->u.buttons.ActionDown);
SDLProcessInputDigitalButton(
ControllerHandles[ControllerIndex],
&OldController->u.buttons.ActionRight,
SDL_CONTROLLER_BUTTON_B,
&NewController->u.buttons.ActionRight);
SDLProcessInputDigitalButton(
ControllerHandles[ControllerIndex],
&OldController->u.buttons.ActionLeft,
SDL_CONTROLLER_BUTTON_X,
&NewController->u.buttons.ActionLeft);
SDLProcessInputDigitalButton(
ControllerHandles[ControllerIndex],
&OldController->u.buttons.ActionUp,
SDL_CONTROLLER_BUTTON_Y,
&NewController->u.buttons.ActionUp);
SDLProcessInputDigitalButton(
ControllerHandles[ControllerIndex],
&OldController->u.buttons.LeftShoulder,
SDL_CONTROLLER_BUTTON_LEFTSHOULDER,
&NewController->u.buttons.LeftShoulder);
SDLProcessInputDigitalButton(
ControllerHandles[ControllerIndex],
&OldController->u.buttons.RightShoulder,
SDL_CONTROLLER_BUTTON_RIGHTSHOULDER,
&NewController->u.buttons.RightShoulder);
SDLProcessInputDigitalButton(
ControllerHandles[ControllerIndex],
&OldController->u.buttons.Start,
SDL_CONTROLLER_BUTTON_START,
&NewController->u.buttons.Start);
SDLProcessInputDigitalButton(
ControllerHandles[ControllerIndex],
&OldController->u.buttons.Back,
SDL_CONTROLLER_BUTTON_BACK,
&NewController->u.buttons.Back);
} else {
/* NOTE: This controller is not plugged in. */
NewController->IsConnected = FALSE;
}
}
TargetQueueBytes = SoundOutput.LatencySampleCount *
SoundOutput.BytesPerSample;
BytesToWrite =
TargetQueueBytes - SDL_GetQueuedAudioSize(1);
SoundBuffer.SamplesPerSecond =
SoundOutput.SamplesPerSecond;
SoundBuffer.SampleCount =
BytesToWrite / SoundOutput.BytesPerSample;
SoundBuffer.Samples = (short *)SoundOutput.Samples;
memset(&Context, 0, sizeof(Context));
Buffer.Memory = GlobalBackbuffer.Memory;
Buffer.Width = GlobalBackbuffer.Width;
Buffer.Height = GlobalBackbuffer.Height;
Buffer.BytesPerPixel = 4;
Buffer.Pitch = GlobalBackbuffer.Pitch;
if(SDLState.InputRecordingIndex) {
SDLRecordInput(&SDLState, NewInput);
}
if(SDLState.InputPlayingIndex) {
SDLPlaybackInput(&SDLState, NewInput);
}
if(Game.UpdateAndRender) {
Game.UpdateAndRender(&Context, &GameMemory,
NewInput, &Buffer,
&SoundBuffer);
}
SDLFillSoundBuffer(&SoundOutput, BytesToWrite);
WorkCounter = SDLGetWallClock();
WorkSecondsElapsed = SDLGetSecondsElapsed(LastCounter,
WorkCounter);
SecondsElapsedForFrame = WorkSecondsElapsed;
if(SecondsElapsedForFrame < TargetSecondsPerFrame) {
while(SecondsElapsedForFrame < TargetSecondsPerFrame) {
SecondsElapsedForFrame =
SDLGetSecondsElapsed(LastCounter,
SDLGetWallClock());
SDL_Delay((U32)((TargetSecondsPerFrame -
SecondsElapsedForFrame) * 1000.0));
}
} else {
/* TODO: Missed frame rate! */
/* TODO: Logging. */
}
EndCounter = SDLGetWallClock();
SDLDisplayBufferInWindow(GlobalBackbuffer, Window,
Renderer);
MSPerFrame = 1000.0 * SDLGetSecondsElapsed(LastCounter,
EndCounter);
FPS = 0.0;
LastCounter = EndCounter;
#if 0
EndCycleCount = __rdtsc();
CyclesElapsed = EndCycleCount - LastCycleCount;
MCPF = ((double)CyclesElapsed / (1000.0 * 1000.0));
fprintf(stderr, "%.02f ms/f, %.02f/s, %.02f mc/f\n",
MSPerFrame, FPS, MCPF);
LastCycleCount = EndCycleCount;
#endif
SWAP(game_input *, NewInput, OldInput);
}
} else {
/* TODO: Failed to allocate Samples and Sound memory . . . */
}
} else {
/* TODO: This didn't work . . . */
}
} else {
/* TODO: This didn't work . . . */
}
/* NOTE: Let the OS clean things up. */
/* NOTE: This, however, might need to be closed? Is there maybe some
* clean up state that close communicates to the controller? */
/* SDLDeinitControllers(); */
/* SDL_CloseAudio(); */
/* SDL_DestroyRenderer(Renderer); */
/* SDL_DestroyWindow(Window); */
/* SDL_Quit(); */
return 0;
}
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