Sets up a basic Win32 application, with a framebuffer and audio.
Poke around in main.c to get started. The demo in the repository takes up 1657 bytes of space.
You need to have:
Set up the environment by running init_msvc.bat, and then run build.bat :)
The project is limited to 32 bits.
Warning
There is no C standard library, so you can't use printf or malloc or anything like that.
Tip
Use VirtualAlloc and VirtualFree to allocate and free memory.
CallbackSetup() to set up your game state. For example:
win32_setup_info CallbackSetup()
{
win32_setup_info Setup = { 0 };
Setup.Title = "Unnamed";
Setup.Width = 800;
Setup.Height = 600;
return Setup;
}CallbackFrame(win32_setup *Setup, DWORD32 *FrameBuffer, int Width, int Height) to draw to the framebuffer (32-bit ARGB). For example:
void CallbackFrame(win32_setup *Setup, DWORD32 *FrameBuffer, int Width, int Height)
{
for (int i = 0; i < Height; i++)
{
for (int j = 0; j < Width; j++)
{
FrameBuffer[i*Width+j] = i^j+GameState.X;
}
}
}CallbackEvent(win32_setup *Setup, HWND Window, UINT Msg, WPARAM wParam, LPARAM lParam) to handle events. For example:
LRESULT CallbackEvent(win32_setup *Setup, HWND Window, UINT Msg, WPARAM wParam, LPARAM lParam)
{
switch (Msg)
{
case WM_KEYDOWN:
if (wParam == VK_LEFT) GameState.X--;
if (wParam == VK_RIGHT) GameState.X++;
if (wParam == VK_DOWN) GameState.P++;
if (wParam == VK_UP) GameState.P--;
break;
}
if (GameState.P < 20) GameState.P = 20;
if (GameState.P > 1000) GameState.P = 1000;
return DefWindowProcA(Window, Msg, wParam, lParam);
}Tip
Look here for list of messages.
CallbackGetSample(win32_setup *Setup) to get a sample for the audio callback. It's called at a rate of 44100 Hz. For example:
// Samples served at a rate of 44100 Hz
// Warning: This runs on a different thread, expect race conditions!
audio_sample CallbackGetSample(win32_setup *Setup)
{
// Plays a square wave
static int Cycle = 0;
static int Timer = 0;
if (Timer > GameState.P)
{
Cycle = !Cycle;
Timer = 0;
}
Timer++;
int SampleValue = (Cycle == 0 ? 32767 : -32767)/16;
return (audio_sample){ SampleValue, SampleValue };
}Warning
This callback runs on a different thread, you need to use mutexes, semaphores, critical sections e.t.c. to avoid race conditions.
CallbackTeardown(win32_setup *Setup) to destroy your game state. For example:
void CallbackTeardown(win32_setup *Setup)
{
// Free any resources you allocated, close any files you opened, save any data, etc.
}Feel free to edit win32.c, it's a reference implementation. Add DirectX or OpenGL or whatever you want.
Maybe you want to put sources into the src/ directory, you can change build.bat to handle that.
win32_setup is passed to all callbacks, you can access the guts of the setup there.