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225 | #include <windows.h>
#include <cstdio>
#include <stdint.h>
#define internal static
#define local_persist static
#define global_variable static
typedef uint8_t uint8;
typedef uint16_t uint16;
typedef uint32_t uint32;
typedef uint64_t uint64;
//TODO: global for now
global_variable bool running;
global_variable BITMAPINFO bitmapInfo;
global_variable void* bitmapMemory;
global_variable int bitmapWidth;
global_variable int bitmapHeight;
internal void Win32ResizeDIBSection(int width, int height)
{
if (bitmapMemory)
{
VirtualFree(bitmapMemory, 0, MEM_RELEASE);
}
bitmapWidth = width;
bitmapHeight = height;
bitmapInfo.bmiHeader.biSize = sizeof(bitmapInfo.bmiHeader);
bitmapInfo.bmiHeader.biWidth = bitmapWidth;
bitmapInfo.bmiHeader.biHeight = -bitmapHeight; // use a top-down DIB
bitmapInfo.bmiHeader.biPlanes = 1;
bitmapInfo.bmiHeader.biBitCount = 32; // bits per pixel
bitmapInfo.bmiHeader.biCompression = BI_RGB; // uncompressed
// NOTE: no more DC. We can allocate memory ourselves
int bytesPerPixel = 4;
int bitmapMemorySize = (width * height) * bytesPerPixel;
bitmapMemory = VirtualAlloc(nullptr, bitmapMemorySize, MEM_COMMIT, PAGE_READWRITE);
int pitch = width * bytesPerPixel;
uint8* row = (uint8*)bitmapMemory;
for (int y = 0; y < bitmapHeight; ++y)
{
uint8* pixel = (uint8*)row;
for (int x = 0; x < bitmapWidth; ++x)
{
/*
pixel in memory: rr gg bb xx
*/
*pixel = 255;
++pixel;
*pixel = 0;
++pixel;
*pixel = 0;
++pixel;
*pixel = 0;
++pixel;
}
row += pitch;
}
}
internal void Win32UpdateWindow(HDC deviceContext, RECT* windowRect, int x, int y, int width, int height)
{
int windowWidth = windowRect->right - windowRect->left;
int windowHeight = windowRect->bottom - windowRect->top;
int cnt = StretchDIBits(deviceContext,
/*x, y, width, height,
x, y, width, height,*/
0, 0, bitmapWidth, bitmapHeight,
0, 0, windowWidth, windowHeight,
&bitmapMemory,
&bitmapInfo,
DIB_RGB_COLORS,
SRCCOPY);
}
LRESULT CALLBACK Win32MainWindowCallback(
HWND window,
UINT message,
WPARAM wParam,
LPARAM lParam)
{
LRESULT result = 0;
switch (message)
{
// when window is resized
case WM_SIZE:
{
// get rect of the window excluding the borders
RECT clientRect;
GetClientRect(window, &clientRect);
int width = clientRect.right - clientRect.left;
int height = clientRect.bottom - clientRect.top;
char buf[256];
sprintf(buf, "x: %d\n", clientRect.left);
OutputDebugStringA(buf);
sprintf(buf, "y: %d\n", clientRect.top);
OutputDebugStringA(buf);
sprintf(buf, "width: %d\n", width);
OutputDebugStringA(buf);
sprintf(buf, "height: %d\n", height);
OutputDebugStringA(buf);
Win32ResizeDIBSection(width, height);
} break;
case WM_DESTROY:
{
// TODO: handle this as an error - recreate window?
running = false;
} break;
case WM_CLOSE:
{
// TODO: handle this with a message to the user? because we may want to close just an internal window in the game
running = false;
} break;
// when window becomes the active window
case WM_ACTIVATEAPP:
{
OutputDebugStringA("WM_ACTIVATEAPP\n");
} break;
case WM_PAINT:
{
PAINTSTRUCT paint;
HDC deviceContext = BeginPaint(window, &paint);
int x = paint.rcPaint.left;
int y = paint.rcPaint.top;
int height = paint.rcPaint.bottom - paint.rcPaint.top;
int width = paint.rcPaint.right - paint.rcPaint.left;
RECT clientRect;
GetClientRect(window, &clientRect);
Win32UpdateWindow(deviceContext, &clientRect, x, y, width, height);
EndPaint(window, &paint);
} break;
default:
{
//OutputDebugStringA("default\n");
result = DefWindowProc(window, message, wParam, lParam);
} break;
}
return result;
}
int CALLBACK WinMain(HINSTANCE Instance, HINSTANCE PrevInstance, LPSTR CommandLine, int ShowCode)
{
WNDCLASS windowClass = {};
// TODO: Check if these flags still matter
windowClass.style = CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
windowClass.lpfnWndProc = Win32MainWindowCallback;
windowClass.hInstance = Instance; // or GetModuleHandle(0);
//windowClass.hIcon;
windowClass.lpszClassName = "HandmadeHeroWindowClass";
// register window class before creating the window
if (RegisterClass(&windowClass))
{
HWND windowHandle = CreateWindowExA(
0,
windowClass.lpszClassName,
"Handmade Hero",
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
0,
0,
Instance,
0);
if (windowHandle)
{
// start message loop
MSG message;
running = true;
while (running)
{
BOOL messageResult = GetMessageA(&message, 0, 0, 0);
if (messageResult > 0)
{
TranslateMessage(&message);
DispatchMessage(&message);
}
else
{
break;
}
}
}
else
{
// TODO: logging
}
}
else
{
//TODO: logging
}
return 0;
}
|