Windows Game Programming for Dummies (2nd Edition)/WinGamProgFD.iso/pc/Source/GPCHAP10/Prog10_2_16b.cpp

C/C++ Source or Header | 2002-04-27 | 10.0 KB | 365 lines

// PROG10_2_16b.CPP - page flipping demo
// 16bit version

// INCLUDES ///////////////////////////////////////////////
#define WIN32_LEAN_AND_MEAN
#define INITGUID

#include <windows.h>   // include important windows stuff
#include <windowsx.h>
#include <mmsystem.h>
#include <iostream.h> // include important C/C++ stuff
#include <conio.h>
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <math.h>
#include <io.h>
#include <fcntl.h>

#include <ddraw.h>  // directX includes

// DEFINES ////////////////////////////////////////////////

// defines for windows
#define WINDOW_CLASS_NAME "WINXCLASS"  // class name

#define WINDOW_WIDTH  640              // size of window
#define WINDOW_HEIGHT 480
#define SCREEN_WIDTH  640              // size of screen
#define SCREEN_HEIGHT 480
#define SCREEN_BPP    16                // bits per pixel

// MACROS /////////////////////////////////////////////////

// these read the keyboard asynchronously
#define KEY_DOWN(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0)
#define KEY_UP(vk_code)   ((GetAsyncKeyState(vk_code) & 0x8000) ? 0 : 1)

// this builds a 16 bit color value in 5.5.5 format (1-bit alpha mode)
#define _RGB16BIT555(r,g,b) ((b & 31) + ((g & 31) << 5) + ((r & 31) << 10))

// this builds a 16 bit color value in 5.6.5 format (green dominate mode)
#define _RGB16BIT565(r,g,b) ((b & 31) + ((g & 63) << 5) + ((r & 31) << 11))

// TYPES //////////////////////////////////////////////////

typedef unsigned short USHORT;
typedef unsigned short WORD;
typedef unsigned char  UCHAR;
typedef unsigned char  BYTE;

// PROTOTYPES /////////////////////////////////////////////

int Game_Init(void *parms=NULL);
int Game_Shutdown(void *parms=NULL);
int Game_Main(void *parms=NULL);

// GLOBALS ////////////////////////////////////////////////

HWND main_window_handle = NULL; // save the window handle
HINSTANCE main_instance = NULL; // save the instance
char buffer[80];                // used to print text

LPDIRECTDRAW7        lpdd         = NULL;  // dd object
LPDIRECTDRAWSURFACE7 lpddsprimary = NULL;  // dd primary surface
LPDIRECTDRAWSURFACE7 lpddsback    = NULL;  // dd back surface
LPDIRECTDRAWPALETTE  lpddpal      = NULL;  // a pointer to the created dd palette
DDSURFACEDESC2       ddsd;                 // a direct draw surface description struct
DDSCAPS2             ddscaps;              // a direct draw surface capabilities struct
HRESULT              ddrval;               // result back from dd calls

// 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

// what is the message
switch(msg)
    {
    case WM_CREATE:
        {
        // do initialization stuff here
        return(0);
        } break;

    case WM_PAINT:
         {
         // start painting
         hdc = BeginPaint(hwnd,&ps);

         // end painting
         EndPaint(hwnd,&ps);
         return(0);
        } break;

    case WM_DESTROY:
        {
        // kill the application
        PostQuitMessage(0);
        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

// WINMAIN ////////////////////////////////////////////////

int WINAPI WinMain(    HINSTANCE hinstance,
                    HINSTANCE hprevinstance,
                    LPSTR lpcmdline,
                    int ncmdshow)
{

WNDCLASS winclass;    // this will hold the class we create
HWND     hwnd;        // generic window handle
MSG         msg;        // generic message
HDC      hdc;       // generic dc
PAINTSTRUCT ps;     // generic paintstruct

// first fill in the window class stucture
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;

// register the window class
if (!RegisterClass(&winclass))
    return(0);

// create the window, note the use of WS_POPUP
if (!(hwnd = CreateWindow(WINDOW_CLASS_NAME, // class
                          "WinX Game Console",     // title
                          WS_POPUP | WS_VISIBLE,
                           0,0,       // x,y
                          WINDOW_WIDTH,  // width
                          WINDOW_HEIGHT, // height
                          NULL,       // handle to parent
                          NULL,       // handle to menu
                          hinstance,// instance
                          NULL)))    // creation parms
return(0);

// save the window handle and instance in a global
main_window_handle = hwnd;
main_instance      = hinstance;

// perform all game console specific initialization
Game_Init();

// enter main event loop
while(1)
    {
    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

// shutdown game and release all resources
Game_Shutdown();

// return to Windows like this
return(msg.wParam);

} // end WinMain

// WINX GAME PROGRAMMING CONSOLE FUNCTIONS ////////////////

int Game_Init(void *parms)
{
// this function is where you do all the initialization
// for your game

// create object and test for error
if (DirectDrawCreateEx(NULL, (void **)&lpdd, IID_IDirectDraw7, NULL)!=DD_OK)
   return(0);

// set cooperation level to windowed mode normal
if (lpdd->SetCooperativeLevel(main_window_handle,
           DDSCL_ALLOWMODEX | DDSCL_FULLSCREEN |
           DDSCL_EXCLUSIVE | DDSCL_ALLOWREBOOT)!=DD_OK)
    return(0);

// set the display mode
if (lpdd->SetDisplayMode(SCREEN_WIDTH,SCREEN_HEIGHT,SCREEN_BPP,0,0)!=DD_OK)
   return(0);

// Create the primary surface
memset(&ddsd,0,sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);

// set the flags to validate both the capabilities
// field and the backbuffer count field
ddsd.dwFlags = DDSD_CAPS | DDSD_BACKBUFFERCOUNT;

// we need to let dd know that we want a complex
// flippable surface structure, set flags for that
ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE | DDSCAPS_FLIP |
                      DDSCAPS_COMPLEX;

// set the backbuffer count to 1
ddsd.dwBackBufferCount = 1;

// create the primary surface
lpdd->CreateSurface(&ddsd,&lpddsprimary,NULL);

// query for the backbuffer or secondary surface
// notice the use of ddscaps to indicate what
// we are requesting
ddscaps.dwCaps = DDSCAPS_BACKBUFFER;

// get the surface
lpddsprimary->GetAttachedSurface(&ddscaps,&lpddsback);

// return success
return(1);

} // end Game_Init

///////////////////////////////////////////////////////////

int Game_Shutdown(void *parms)
{
// this function is where you shutdown your game and
// release all resources that you allocated

// first release the secondary surface
if (lpddsback!=NULL)
   lpddsback->Release();

// now release the primary surface
if (lpddsprimary!=NULL)
   lpddsprimary->Release();

// release the directdraw object
if (lpdd!=NULL)
   lpdd->Release();

// return success
return(1);
} // end Game_Shutdown

///////////////////////////////////////////////////////////

int Game_Main(void *parms)
{
// this is the workhorse of your game it will be called
// continuously in real-time this is like main() in C
// all the calls for you game go here!

USHORT *back_buffer = NULL, // used to draw
       *dest_ptr    = NULL, // used in line by line copy
       *src_ptr     = NULL; // " "

// check of user is trying to exit
if (KEY_DOWN(VK_ESCAPE) || KEY_DOWN(VK_SPACE))
    PostMessage(main_window_handle, WM_DESTROY,0,0);

// erase secondary back buffer
memset(&ddsd,0,sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);

// lock the secondary surface
lpddsback->Lock(NULL,&ddsd,
              DDLOCK_SURFACEMEMORYPTR | DDLOCK_WAIT,NULL);

// get video pointer to secondary surface
back_buffer = (USHORT *)ddsd.lpSurface;

// clear back buffer out, remember in 16bit mode there are
// 2 bytes per pixel, so watch out for addressing and multiplying
// issues in this code

// linear memory
if (ddsd.lPitch == SCREEN_WIDTH*2)
    memset(back_buffer,0,SCREEN_WIDTH*SCREEN_HEIGHT*(SCREEN_BPP/8));
else
   {
   // non-linear memory

   // make copy of video pointer
   dest_ptr = back_buffer;

   // clear out memory one line at a time
   for (int y=0; y < SCREEN_HEIGHT; y++)
       {
       // clear next line
       memset(dest_ptr,0,SCREEN_WIDTH*(SCREEN_BPP/8));

       // advance pointer to next line
       dest_ptr+=(ddsd.lPitch/2);

       } // end for y

   } // end else

// perform game logic...

// draw the next frame into the secondary back buffer
// plot 5000 random pixels
for (int index = 0; index < 5000; index++)
    {
    int   x     = rand()%SCREEN_WIDTH;
    int   y     = rand()%SCREEN_HEIGHT;

    UCHAR red   = rand()%256;
    UCHAR green = rand()%256;
    UCHAR blue  = rand()%256;

    // back_buffer is a short pointer, BUT lpitch is in bytes
    // so divide by 2, to get number of "pixels" or words
    back_buffer[x+y*(ddsd.lPitch/2)] = _RGB16BIT565(red, green, blue);
    } // end for index

// unlock secondary buffer
lpddsback->Unlock(NULL);

// flip pages
while(lpddsprimary->Flip(NULL, DDFLIP_WAIT)!=DD_OK);

// wait a sec
Sleep(5);

// return success
return(1);

} // end Game_Main

///////////////////////////////////////////////////////////