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/**
Beginning Game Programming, Third Edition
Chapter 2
GameLoop project
**/
#include <windows.h>
#include <iostream>
#include <time.h>
using namespace std;
const string APPTITLE = "Game Loop";
HWND window;
HDC device;
bool gameover = false;
/**
** Loads and draws a bitmap from a file and then frees the memory
**/
void DrawBitmap(char *filename, int x, int y)
{
//load the bitmap image
HBITMAP image = (HBITMAP)LoadImage(0,"wu.bmp",IMAGE_BITMAP,0,0,LR_LOADFROMFILE);
//read the bitmap's properties
BITMAP bm;
GetObject(image, sizeof(BITMAP), &bm);
//create a device context for the bitmap
HDC hdcImage = CreateCompatibleDC(device);
SelectObject(hdcImage, image);
//draw the bitmap to the window (bit block transfer)
BitBlt(
device, //destination device context
x, y, //x,y location on destination
bm.bmWidth, bm.bmHeight, //width,height of source bitmap
hdcImage, //source bitmap device context
0, 0, //start x,y on source bitmap
SRCCOPY); //blit method
//delete the device context and bitmap
DeleteDC(hdcImage);
DeleteObject((HBITMAP)image);
}
/**
** Startup and loading code goes here
**/
bool Game_Init()
{
//start up the random number generator
srand(time(NULL));
return 1;
}
/**
** Update function called from inside game loop
**/
void Game_Run()
{
static int x = 0;
static int y = 0;
static int counter = 0;
if (gameover == true) return;
//get the drawing surface
RECT rect;
GetClientRect(window, &rect);
//draw bitmap at random location
x = 640;
y = 480;
DrawBitmap("wu.bmp", x, y);
}
/**
** Shutdown code
**/
void Game_End()
{
//free the device
ReleaseDC(window, device);
}
/**
** Window callback function
**/
LRESULT CALLBACK WinProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_DESTROY:
gameover = true;
PostQuitMessage(0);
break;
}
return DefWindowProc(hWnd, message, wParam, lParam);
}
/**
** MyRegiserClass function sets program window properties
**/
ATOM MyRegisterClass(HINSTANCE hInstance)
{
//create the window class structure
WNDCLASSEX wc;
wc.cbSize = sizeof(WNDCLASSEX);
//fill the struct with info
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = (WNDPROC)WinProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = NULL;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = APPTITLE.c_str();
wc.hIconSm = NULL;
//set up the window with the class info
return RegisterClassEx(&wc);
}
/**
** Helper function to create the window and refresh it
**/
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
//create a new window
window = CreateWindow(
APPTITLE.c_str(), //window class
APPTITLE.c_str(), //title bar
WS_OVERLAPPEDWINDOW, //window style
CW_USEDEFAULT, //x position of window
CW_USEDEFAULT, //y position of window
640, //width of the window
480, //height of the window
NULL, //parent window
NULL, //menu
hInstance, //application instance
NULL); //window parameters
//was there an error creating the window?
if (window == 0) return 0;
//display the window
ShowWindow(window, nCmdShow);
UpdateWindow(window);
//get device context for drawing
device = GetDC(window);
return 1;
}
/**
** Entry point function
**/
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
MSG msg;
//create window
MyRegisterClass(hInstance);
if (!InitInstance (hInstance, nCmdShow)) return 0;
//initialize the game
if (!Game_Init()) return 0;
// main message loop
while (!gameover)
{
//process Windows events
if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
//process game loop
Game_Run();
}
//free game resources
Game_End();
return msg.wParam;
}
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