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Day 21 complete.

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ikolokolnikov
2026-03-18 17:02:29 -07:00
parent b7cf0164c6
commit 92c5a75c05
3 changed files with 45 additions and 19 deletions
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handmade.cpp
+10 -6
View File
@@ -3,20 +3,22 @@
#include <math.h>
static void GameOutputSound(game_sound_output_buffer *SoundBuffer, S32 ToneHz)
static void GameOutputSound(game_state *GameState, game_sound_output_buffer *SoundBuffer, S32 ToneHz)
{
static F32 tSine;
S16 ToneVolume = 8000;
S32 WavePeriod = SoundBuffer->SamplesPerSecond / ToneHz;
S16 *SampleOut = SoundBuffer->Samples;
for(S32 SampleIndex = 0; SampleIndex < SoundBuffer->SampleCount; SampleIndex++) {
F32 SineValue = sinf(tSine);
F32 SineValue = sinf(GameState->tSine);
S16 SampleValue = S16(SineValue * ToneVolume);
*SampleOut++ = SampleValue;
*SampleOut++ = SampleValue;
tSine += 2.0f * PI * 1.0f / (F32)WavePeriod;
GameState->tSine += 2.0f * (F32)PI * 1.0f / (F32)WavePeriod;
if(GameState->tSine > 2.0f*(F32)PI) {
GameState->tSine -= 2.0f*(F32)PI;
}
}
}
@@ -31,6 +33,7 @@ static void RenderWeirdGradient(game_offscreen_buffer *Buffer, S32 XOffset, S32
for(S32 X = 0; X < Width; X++) {
U8 Blue = (U8)(X + XOffset);
U8 Green = (U8)(Y + YOffset);
*Pixel = (Green << 8) | Blue;
Pixel++;
}
@@ -45,7 +48,7 @@ void UpdateAndRender(game_memory *Memory, game_input *Input, game_offscreen_buff
game_state *GameState = (game_state *)Memory->PermanentStorage;
if(!Memory->IsInitialized) {
char FileName[] = "/Users/igor/Developer/handmade_hero_course/handmade/code/sdl_handmade.cpp";
char FileName[] = "/home/igor/Developer/handmade/sdl_handmade.cpp";
debug_read_file_result BitmapMemory = Memory->DEBUGPlatformReadEntireFile(FileName);
if(BitmapMemory.Contents) {
Memory->DEBUGPlatformWriteEntireFile("test.out", BitmapMemory.ContentsSize, BitmapMemory.Contents);
@@ -53,6 +56,7 @@ void UpdateAndRender(game_memory *Memory, game_input *Input, game_offscreen_buff
}
GameState->ToneHz = 256;
GameState->tSine = 0.0f;
// TODO: Maybe more appropriate to do in the platform layer?
Memory->IsInitialized = true;
@@ -83,6 +87,6 @@ void UpdateAndRender(game_memory *Memory, game_input *Input, game_offscreen_buff
}
}
GameOutputSound(SoundBuffer, GameState->ToneHz);
GameOutputSound(GameState, SoundBuffer, GameState->ToneHz);
RenderWeirdGradient(Buffer, GameState->BlueOffset, GameState->GreenOffset);
}
handmade.h
+2
View File
@@ -118,6 +118,8 @@ typedef struct game_state {
S32 ToneHz;
S32 GreenOffset;
S32 BlueOffset;
F32 tSine;
} game_state;
#endif // HANDMADE_H
sdl_handmade.cpp
+33 -13
View File
@@ -325,7 +325,7 @@ static F32 SDLGetSecondsElapsed(U64 Start, U64 End)
}
typedef struct sdl_game_code {
void *GameCode;
void *GameCodeDLL;
void (*UpdateAndRender)(game_memory *, game_input *, game_offscreen_buffer *, game_sound_output_buffer *);
B32 IsValid;
@@ -335,25 +335,35 @@ static sdl_game_code SDLLoadGameCode()
{
sdl_game_code Result = {0};
Result.GameCode = dlopen("./libhandmade.so", RTLD_NOW);
if(Result.GameCode) {
Result.UpdateAndRender = (void(*)(game_memory *, game_input *, game_offscreen_buffer *, game_sound_output_buffer *))dlsym(Result.GameCode, "UpdateAndRender");
Result.GameCodeDLL = dlopen("./libhandmade.so", RTLD_NOW);
if(Result.GameCodeDLL) {
Result.UpdateAndRender = (void(*)(game_memory *, game_input *, game_offscreen_buffer *, game_sound_output_buffer *))dlsym(Result.GameCodeDLL, "UpdateAndRender");
if(!Result.UpdateAndRender) {
// TODO: Diagnostic.
fprintf(stderr, "%s\n", dlerror());
// TODO: Diagnostic. dlerror()
}
Result.IsValid = Result.UpdateAndRender ? TRUE : FALSE;
} else {
// TODO: Diagnostic.
fprintf(stderr, "%s\n", dlerror());
// 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;
}
S32 main(S32 argc, char *argv[])
{
sdl_game_code Game = SDLLoadGameCode();
if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_GAMECONTROLLER | SDL_INIT_AUDIO)) {
/* TODO: This didn't work . . . */
}
@@ -404,9 +414,9 @@ S32 main(S32 argc, char *argv[])
GameMemory.PermanentStorage = mmap(BaseAddress, TotalStorageSize, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
GameMemory.TransientStorage = (U8 *)(GameMemory.PermanentStorage) + GameMemory.PermanentStorageSize;
GameMemory.DEBUGPlatformReadEntireFile = DEBUGPlatformReadEntireFile;
GameMemory.DEBUGPlatformWriteEntireFile = DEBUGPlatformWriteEntireFile;
GameMemory.DEBUGPlatformFreeFileMemory = DEBUGPlatformFreeFileMemory;
GameMemory.DEBUGPlatformReadEntireFile = &DEBUGPlatformReadEntireFile;
GameMemory.DEBUGPlatformWriteEntireFile = &DEBUGPlatformWriteEntireFile;
GameMemory.DEBUGPlatformFreeFileMemory = &DEBUGPlatformFreeFileMemory;
if(SoundOutput.Samples && GameMemory.PermanentStorage && GameMemory.TransientStorage) {
game_input Input[2];
@@ -421,6 +431,9 @@ S32 main(S32 argc, char *argv[])
U64 LastCycleCount;
#endif
sdl_game_code Game = SDLLoadGameCode();
U32 LoadCounter = 0;
while(GlobalRunning) {
LastCounter = SDLGetWallClock();
@@ -432,6 +445,13 @@ S32 main(S32 argc, char *argv[])
S32 GameUpdateHz = MonitorRefreshHz / 2;
F32 TargetSecondsPerFrame = 1.0f / (F32)GameUpdateHz;
if(LoadCounter > (U32)(GameUpdateHz * 2)) {
SDLUnloadGameCode(&Game);
Game = SDLLoadGameCode();
LoadCounter = 0;
}
LoadCounter++;
game_controller_input *OldKeyboardController = GetController(OldInput, 0);
game_controller_input *NewKeyboardController = GetController(NewInput, 0);
game_controller_input ZeroController = {0};