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221 | #include <windows.h>
#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;
typedef int8_t int8;
typedef int16_t int16;
typedef int32_t int32;
typedef int64_t int64;
global_variable bool Running;
global_variable BITMAPINFO BitmapInfo;
global_variable void* BitmapMemory;
global_variable int BitmapWidth;
global_variable int BitmapHeight;
global_variable int BytesPerPixel = 4;
internal void RenderWeirdGradient(int XOffset, int YOffset)
{
int Width = BitmapWidth;
int Height = BitmapHeight;
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 = (uint8)(X + XOffset);
++Pixel;
*Pixel = (uint8)(Y + YOffset);
++Pixel;
*Pixel = 0;
++Pixel;
*Pixel = 0;
++Pixel;
}
Row += Pitch;
}
}
internal void Win32ResizeDIBSection(int Width, int Height)
{
// TODO: bulletproof this
// maybe don't free first, free after, then free first if that fails
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;
BitmapInfo.bmiHeader.biPlanes = 1;
BitmapInfo.bmiHeader.biBitCount = 32;
BitmapInfo.bmiHeader.biCompression = BI_RGB;
int BitmapMemorySize = BitmapWidth * BitmapHeight * BytesPerPixel;
BitmapMemory = VirtualAlloc(0, BitmapMemorySize, MEM_COMMIT, PAGE_READWRITE);
// TODO: clear to black
}
internal void Win32UpdateWindow(HDC DeviceContext, RECT* ClientRect, int X, int Y, int Width, int Height)
{
int WindowWidth = ClientRect->right - ClientRect->left;
int WindowHeight = ClientRect->bottom - ClientRect->top;
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(_In_ HWND Window,
_In_ UINT Message,
_In_ WPARAM WParam,
_In_ LPARAM LParam)
{
LRESULT Result = 0;
switch(Message)
{
case WM_SIZE:
{
RECT ClientRect;
GetClientRect(Window, &ClientRect);
int Width = ClientRect.right - ClientRect.left;
int Height = ClientRect.bottom - ClientRect.top;
Win32ResizeDIBSection(Width, Height);
OutputDebugStringA("WM_SIZE\n");
} break;
case WM_CLOSE:
{
// TODO: handle this with msg to user?
Running = false;
OutputDebugStringA("WM_CLOSE\n");
} break;
case WM_ACTIVATEAPP:
{
OutputDebugStringA("WM_ACTIVATEAPP\n");
} break;
case WM_DESTROY:
{
// TODO: handle this as error - recreate window?
Running = false;
} break;
case WM_PAINT:
{
PAINTSTRUCT Paint;
HDC DeviceContext = BeginPaint(Window, &Paint);
int X = Paint.rcPaint.left;
int Y = Paint.rcPaint.top;
int Width = Paint.rcPaint.right - Paint.rcPaint.left;
int Height = Paint.rcPaint.bottom - Paint.rcPaint.top;
RECT ClientRect;
GetClientRect(Window, &ClientRect);
Win32UpdateWindow(DeviceContext, &ClientRect, X, Y, Width, Height);
EndPaint(Window, &Paint);
} break;
default:
{
Result = DefWindowProc(Window, Message, WParam, LParam);
} break;
}
return Result;
}
int CALLBACK WinMain(
_In_ HINSTANCE Instance,
_In_ HINSTANCE PrevInstance,
_In_ LPSTR CommandLine,
_In_ int ShowCode)
{
WNDCLASS windowClass{};
windowClass.style = CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
windowClass.lpfnWndProc = Win32MainWindowCallBack;
windowClass.hInstance = Instance;
windowClass.lpszClassName = "HandmadeHeroWindowClass";
if (RegisterClass(&windowClass))
{
HWND Window = CreateWindowEx(0,
windowClass.lpszClassName,
"Handmade Hero",
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
0,
0,
Instance,
0);
if (Window)
{
int XOffset = 0;
int YOffset = 0;
Running = true;
while (Running)
{
MSG Message;
while (PeekMessage(&Message, 0, 0, 0, PM_REMOVE))
{
if (Message.message == WM_QUIT)
{
Running = false;
}
TranslateMessage(&Message);
DispatchMessageA(&Message);
}
RenderWeirdGradient(XOffset, YOffset);
HDC DeviceContext = GetDC(Window);
RECT ClientRect;
GetClientRect(Window, &ClientRect);
int WindowWidth = ClientRect.right - ClientRect.left;
int WindowHeight = ClientRect.bottom - ClientRect.top;
Win32UpdateWindow(DeviceContext, &ClientRect, 0, 0, WindowWidth, WindowHeight);
ReleaseDC(Window, DeviceContext);
++XOffset;
}
}
else
{
// TODO: logging
}
}
else
{
// TODO: logging
}
return 0;
}
|