www.pudn.com > Windows Game Programming Gurus Examp > demo4_9.cpp
// DEMO4_9.CPP - Starfield demo based on T3D console // INCLUDES /////////////////////////////////////////////// #define WIN32_LEAN_AND_MEAN // just say no to MFC #include// include important windows stuff #include #include #include // include important C/C++ stuff #include #include #include #include #include #include #include #include #include #include // DEFINES //////////////////////////////////////////////// // defines for windows #define WINDOW_CLASS_NAME "WINCLASS1" #define WINDOW_WIDTH 400 #define WINDOW_HEIGHT 300 // starfield defines #define NUM_STARS 256 // MACROS ///////////////////////////////////////////////// #define KEYDOWN(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0) #define KEYUP(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 0 : 1) // TYPES ////////////////////////////////////////////////// typedef struct STAR_TYP { int x,y; // position of star int vel; // horizontal velocity of star COLORREF col; // color of star } STAR, *STAR_PTR; // PROTOTYPES ///////////////////////////////////////////// void Erase_Stars(void); void Draw_Stars(void); void Move_Stars(void); void Init_Stars(void); // GLOBALS //////////////////////////////////////////////// HWND main_window_handle = NULL; // globally track main window HINSTANCE hinstance_app = NULL; // globally track hinstance HDC global_dc = NULL; // tracks a global dc char buffer[80]; // general printing buffer STAR stars[256]; // holds the starfield // FUNCTIONS ////////////////////////////////////////////// LRESULT CALLBACK WindowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) { // this is the main message handler of the system PAINTSTRUCT ps; // used in WM_PAINT HDC hdc; // handle to a device context char buffer[80]; // used to print strings // what is the message switch(msg) { case WM_CREATE: { // do initialization stuff here // return success return(0); } break; case WM_PAINT: { // simply validate the window hdc = BeginPaint(hwnd,&ps); // end painting EndPaint(hwnd,&ps); // return success return(0); } break; case WM_DESTROY: { // kill the application, this sends a WM_QUIT message PostQuitMessage(0); // return success return(0); } break; default:break; } // end switch // process any messages that we didn't take care of return (DefWindowProc(hwnd, msg, wparam, lparam)); } // end WinProc /////////////////////////////////////////////////////////// void Init_Stars(void) { // this function initializes all the stars for (int index=0; index < NUM_STARS; index++) { // select random position stars[index].x = rand()%WINDOW_WIDTH; stars[index].y = rand()%WINDOW_HEIGHT; // set random velocity stars[index].vel = 1 + rand()%16; // set intensity which is inversely prop to velocity for 3D effect // note, I am mixing equal amounts of RGB to make black -> bright white int intensity = 15*(17 - stars[index].vel); stars[index].col = RGB(intensity, intensity, intensity); } // end for index } // end Init_Stars //////////////////////////////////////////////////////////// void Erase_Stars(void) { // this function erases all the stars for (int index=0; index < NUM_STARS; index++) SetPixel(global_dc, stars[index].x, stars[index].y, RGB(0,0,0)); } // end Erase_Stars //////////////////////////////////////////////////////////// void Draw_Stars() { // this function draws all the stars for (int index=0; index < NUM_STARS; index++) SetPixel(global_dc, stars[index].x, stars[index].y, stars[index].col); } // end Draw_Stars //////////////////////////////////////////////////////////// void Move_Stars(void) { // this function moves all the stars and wraps them around the // screen boundaries for (int index=0; index < NUM_STARS; index++) { // move the star and test for edge stars[index].x+=stars[index].vel; if (stars[index].x >= WINDOW_WIDTH) stars[index].x -= WINDOW_WIDTH; } // end for index } // end Move_Stars //////////////////////////////////////////////////////////// int Game_Main(void *parms = NULL, int num_parms = 0) { // this is the main loop of the game, do all your processing // here // get the time DWORD start_time = GetTickCount(); // erase the stars Erase_Stars(); // move the stars Move_Stars(); // draw the stars Draw_Stars(); // lock to 30 fps while((start_time - GetTickCount() < 33)); // for now test if user is hitting ESC and send WM_CLOSE if (KEYDOWN(VK_ESCAPE)) SendMessage(main_window_handle,WM_CLOSE,0,0); // return success or failure or your own return code here return(1); } // end Game_Main //////////////////////////////////////////////////////////// int Game_Init(void *parms = NULL, int num_parms = 0) { // this is called once after the initial window is created and // before the main event loop is entered, do all your initialization // here // first get the dc to the window global_dc = GetDC(main_window_handle); // initialize the star field here Init_Stars(); // return success or failure or your own return code here return(1); } // end Game_Init ///////////////////////////////////////////////////////////// int Game_Shutdown(void *parms = NULL, int num_parms = 0) { // this is called after the game is exited and the main event // loop while is exited, do all you cleanup and shutdown here // release the global dc ReleaseDC(main_window_handle, global_dc); // return success or failure or your own return code here return(1); } // end Game_Shutdown // WINMAIN //////////////////////////////////////////////// int WINAPI WinMain( HINSTANCE hinstance, HINSTANCE hprevinstance, LPSTR lpcmdline, int ncmdshow) { WNDCLASSEX winclass; // this will hold the class we create HWND hwnd; // generic window handle MSG msg; // generic message HDC hdc; // graphics device context // first fill in the window class stucture winclass.cbSize = sizeof(WNDCLASSEX); winclass.style = CS_DBLCLKS | CS_OWNDC | CS_HREDRAW | CS_VREDRAW; winclass.lpfnWndProc = WindowProc; winclass.cbClsExtra = 0; winclass.cbWndExtra = 0; winclass.hInstance = hinstance; winclass.hIcon = LoadIcon(NULL, IDI_APPLICATION); winclass.hCursor = LoadCursor(NULL, IDC_ARROW); winclass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH); winclass.lpszMenuName = NULL; winclass.lpszClassName = WINDOW_CLASS_NAME; winclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION); // save hinstance in global hinstance_app = hinstance; // register the window class if (!RegisterClassEx(&winclass)) return(0); // create the window if (!(hwnd = CreateWindowEx(NULL, // extended style WINDOW_CLASS_NAME, // class "T3D Game Console Star Demo", // title WS_OVERLAPPEDWINDOW | WS_VISIBLE, 0,0, // initial x,y 400,300, // initial width, height NULL, // handle to parent NULL, // handle to menu hinstance,// instance of this application NULL))) // extra creation parms return(0); // save main window handle main_window_handle = hwnd; // initialize game here Game_Init(); // enter main event loop while(TRUE) { // test if there is a message in queue, if so get it if (PeekMessage(&msg,NULL,0,0,PM_REMOVE)) { // test if this is a quit if (msg.message == WM_QUIT) break; // translate any accelerator keys TranslateMessage(&msg); // send the message to the window proc DispatchMessage(&msg); } // end if // main game processing goes here Game_Main(); } // end while // closedown game here Game_Shutdown(); // return to Windows like this return(msg.wParam); } // end WinMain ///////////////////////////////////////////////////////////