I'm current on Day 4 and I ran into an issue. Sorry if I am posting in the wrong forum -- please feel free to move this to the appropriate section.
When I move the window, the animation stops. This is expected, and Casey's does the same.
However, upon resize, everything goes black until the resize operation is done. I don't see this exhibited by Casey's executable (around 52:16 in the video for day 4). It looks like the painted area "expands" as he drags to make the window larger.
I've looked over the code a couple times and the video as well, but I can't seem to figure it out.
Do you guys see anything? Thanks!
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 | #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; } |