Windows Game Programming for Dummies (2nd Edition)/WinGamProgFD.iso/pc/Source/GPCHAP14/PROG14_3.CPP

C/C++ Source or Header | 2002-04-29 | 16.6 KB | 662 lines

// PROG14_3.CPP - DirectInput joystick demo
// move the bug blaster around, notice it moves more or
// less depending on how much the stick is moves, hence
// the analog nature of joysticks


// INCLUDES ///////////////////////////////////////////////

#define WIN32_LEAN_AND_MEAN
#define INITGUID

#include <windows.h>   // include important windows stuff
#include <windowsx.h>
#include <mmsystem.h>
#include <objbase.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
#include <dinput.h>
#include "gpdumb1.h"

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

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

#define WINDOW_WIDTH    64   // size of window
#define WINDOW_HEIGHT   48


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

// game console
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

// directinput globals
LPDIRECTINPUT8       lpdi      = NULL;    // dinput object
LPDIRECTINPUTDEVICE8 lpdikey   = NULL;    // dinput keyboard
LPDIRECTINPUTDEVICE8 lpdimouse = NULL;    // dinput mouse
LPDIRECTINPUTDEVICE8 lpdijoy   = NULL;    // dinput joystick
GUID                 joystickGUID;        // guid for main joystick
char                 joyname[80];         // name of joystick

// these contain the target records for all di input packets
UCHAR keyboard_state[256]; // contains keyboard state table
DIMOUSESTATE mouse_state;  // contains state of mouse
DIJOYSTATE joy_state;      // contains state of joystick

BITMAP_IMAGE playfield;       // used to hold playfield
BITMAP_IMAGE mushrooms[4];    // holds mushrooms
BOB          blaster;         // holds bug blaster

int blaster_anim[5] = {0,1,2,1,0};  // blinking animation

// lets use a line segment for the missle
int missile_x,              // position of missle
    missile_y,
    missile_state;          // state of missle 0 off, 1 on

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

int Color_Scan(int x1, int y1, int x2, int y2,
      UCHAR scan_start, UCHAR scan_end,
      UCHAR *scan_buffer, int scan_lpitch);

int Start_Missile(void);
int Move_Missile(void);
int Draw_Missile(void);

// 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)
{
// this is the winmain function

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

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

int Color_Scan(int x1, int y1, int x2, int y2,
               UCHAR scan_start, UCHAR scan_end,
               UCHAR *scan_buffer, int scan_lpitch)
{
// this function implements a crude collision technique
// based on scanning for a range of colors within a rectangle

// clip rectangle

// x coords first
if (x1 >= screen_width)
   x1=screen_width-1;
else
if (x1 < 0)
   x1=0;

if (x2 >= screen_width)
   x2=screen_width-1;
else
if (x2 < 0)
   x2=0;

// now y-coords
if (y1 >= screen_height)
   y1=screen_height-1;
else
if (y1 < 0)
   y1=0;

if (y2 >= screen_height)
   y2=screen_height-1;
else
if (y2 < 0)
   y2=0;

// scan the region
scan_buffer +=y1*scan_lpitch;

for (int scan_y=y1; scan_y<=y2; scan_y++)
    {
    for (int scan_x=x1; scan_x<=x2; scan_x++)
        {
        if (scan_buffer[scan_x] >= scan_start && scan_buffer[scan_x] <= scan_end )
            return(1);
        } // end for x

    // move down a line
    scan_buffer+=scan_lpitch;

    } // end for y

// return failure
return(0);

} // end Color_Scan

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

BOOL CALLBACK DI_Enum_Joysticks(LPCDIDEVICEINSTANCE lpddi,
                                LPVOID guid_ptr)
{
// this function enumerates the joysticks, but
// stops at the first one and returns the
// instance guid of it, so we can create it

*(GUID*)guid_ptr = lpddi->guidInstance;

// copy name into global
strcpy(joyname, (char *)lpddi->tszProductName);

// stop enumeration after one iteration
return(DIENUM_STOP);

} // end DI_Enum_Joysticks

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

int Start_Missile(void)
{
// this function starts the missle, if it is currently off

if (missile_state==0)
    {
    // enable missile
    missile_state = 1;

    // computer position of missile
    missile_x = blaster.x + 16;
    missile_y = blaster.y-4;

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

// couldn't start missile
return(0);

} // end Start_Missile

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

int Move_Missile(void)
{
// this function moves the missle

// test if missile is alive
if (missile_state==1)
   {
   // move the missile upward
   if ((missile_y-=10) < 0)
      {
      missile_state = 0;
      return(1);
      } // end if

   // lock secondary buffer
   DD_Lock_Back_Surface();

   // test if missile has hit anything
   if (Color_Scan(missile_x-1, missile_y+4,
                  missile_x+1, missile_y+12,
                  1,255, back_buffer,back_lpitch))
      {
      // kill missile
      missile_state = 0;

      // cause some damage
      for (int index=0; index<25; index++)
          {
          Draw_Pixel(missile_x-4+rand()%8,missile_y-2+rand()%12,0,
                      playfield.buffer, playfield.width);

          } // end for index

      } // end if

   // unlock surface
   DD_Unlock_Back_Surface();

   // return success
   return(1);

   } // end if

// return failure
return(0);

} // end Move_Missle

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

int Draw_Missile(void)
{
// this function draws the missile

// test if missile is alive
if (missile_state==1)
   {
   // lock secondary buffer
   DD_Lock_Back_Surface();

   // draw the missile in green
   Draw_Clip_Line(missile_x, missile_y,
                  missile_x, missile_y+6,
                  250,back_buffer, back_lpitch);

   // unlock surface
   DD_Unlock_Back_Surface();

   // return success
   return(1);

   } // end if

// return failure
return(0);

} // end Draw_Missle

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

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

int index;         // looping var
char filename[80]; // used to build up files names

// set up screen dimensions
screen_width  = 640;
screen_height = 480;
screen_bpp    = 8;

// initialize directdraw
DD_Init(screen_width, screen_height, screen_bpp);

// joystick creation section ////////////////////////////////

// first create the direct input object
if (DirectInput8Create(main_instance, DIRECTINPUT_VERSION, IID_IDirectInput8, (void **)&lpdi,NULL)!=DI_OK)
   return(0);

// first find the fucking GUID of your particular joystick
lpdi->EnumDevices(DI8DEVCLASS_GAMECTRL,
                  DI_Enum_Joysticks,
                  &joystickGUID,
                  DIEDFL_ATTACHEDONLY);

if (lpdi->CreateDevice(joystickGUID, &lpdijoy, NULL)!=DI_OK)
   return(0);

// set cooperation level
if (lpdijoy->SetCooperativeLevel(main_window_handle,
                     DISCL_NONEXCLUSIVE | DISCL_BACKGROUND)!=DI_OK)
   return(0);

// set data format
if (lpdijoy->SetDataFormat(&c_dfDIJoystick)!=DI_OK)
   return(0);

// set the range of the joystick
DIPROPRANGE joy_axis_range;

// first x axis
joy_axis_range.lMin = -24;
joy_axis_range.lMax = 24;

joy_axis_range.diph.dwSize       = sizeof(DIPROPRANGE);
joy_axis_range.diph.dwHeaderSize = sizeof(DIPROPHEADER);
joy_axis_range.diph.dwObj        = DIJOFS_X;
joy_axis_range.diph.dwHow        = DIPH_BYOFFSET;

lpdijoy->SetProperty(DIPROP_RANGE,&joy_axis_range.diph);

// now y-axis
joy_axis_range.lMin = -24;
joy_axis_range.lMax = 24;

joy_axis_range.diph.dwSize       = sizeof(DIPROPRANGE);
joy_axis_range.diph.dwHeaderSize = sizeof(DIPROPHEADER);
joy_axis_range.diph.dwObj        = DIJOFS_Y;
joy_axis_range.diph.dwHow        = DIPH_BYOFFSET;

lpdijoy->SetProperty(DIPROP_RANGE,&joy_axis_range.diph);

// acquire the joystick
if (lpdijoy->Acquire()!=DI_OK)
   return(0);

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

// load the background
Load_Bitmap_File(&bitmap8bit, "MUSH8.BMP");

// set the palette to background image palette
Set_Palette(bitmap8bit.palette);

// load in the four frames of the mushroom
for (index=0; index<4; index++)
    {
    // create mushroom bitmaps
    Create_Bitmap(&mushrooms[index],0,0,32,32);
    Load_Image_Bitmap(&mushrooms[index],&bitmap8bit,index,0,BITMAP_EXTRACT_MODE_CELL);
    } // end for index

// now create the bug blaster bob
Create_BOB(&blaster,0,0,32,32,3,
           BOB_ATTR_VISIBLE | BOB_ATTR_MULTI_ANIM | BOB_ATTR_ANIM_ONE_SHOT,
           DDSCAPS_SYSTEMMEMORY);

// load in the four frames of the mushroom
for (index=0; index<3; index++)
     Load_Frame_BOB(&blaster,&bitmap8bit,index,index,1,BITMAP_EXTRACT_MODE_CELL);

// unload the bitmap file
Unload_Bitmap_File(&bitmap8bit);

// set the animation sequences for bug blaster
Load_Animation_BOB(&blaster,0,5,blaster_anim);

// set up stating state of bug blaster
Set_Pos_BOB(&blaster,320, 400);
Set_Anim_Speed_BOB(&blaster,3);

// set clipping rectangle to screen extents so objects dont
// mess up at edges
RECT screen_rect = {0,0,screen_width,screen_height};
lpddclipper = DD_Attach_Clipper(lpddsback,1,&screen_rect);

// seed random number generator
srand(Start_Clock());

// create mushroom playfield bitmap
Create_Bitmap(&playfield,0,0,screen_width,screen_height);
playfield.attr |= BITMAP_ATTR_LOADED;

// clear it out
memset(playfield.buffer,0,playfield.width*playfield.height);

// create the random mushroom patch
for (index=0; index<50; index++)
    {
    // select a mushroom
    int mush = rand()%4;

    // set mushroom to random position
    mushrooms[mush].x = rand()%(screen_width-32);
    mushrooms[mush].y = rand()%(screen_height-128);

    // now draw the mushroom into playfield
    Draw_Bitmap(&mushrooms[mush], playfield.buffer, playfield.width,1);

    } // end for

// hide the mouse
ShowCursor(FALSE);

// 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

// kill the bug blaster
Destroy_BOB(&blaster);

// kill the mushroom maker
for (int index=0; index<4; index++)
    Destroy_Bitmap(&mushrooms[index]);

// kill the playfield bitmap
Destroy_Bitmap(&playfield);

// release joystick
lpdijoy->Unacquire();
lpdijoy->Release();
lpdi->Release();

// shutdonw directdraw
DD_Shutdown();

// 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!

int          index;             // looping var
int          dx,dy;             // general deltas used in collision detection

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

// start the timing clock
Start_Clock();

// get joystick data
lpdijoy->Poll(); // this is needed for joysticks only
lpdijoy->GetDeviceState(sizeof(DIJOYSTATE), (LPVOID)&joy_state);

// clear the drawing surface
DD_Fill_Surface(lpddsback, 0);

// lock the back buffer
DD_Lock_Back_Surface();

// draw the background reactor image
Draw_Bitmap(&playfield, back_buffer, back_lpitch, 0);

// unlock the back buffer
DD_Unlock_Back_Surface();

// is the player moving?
blaster.x+=joy_state.lX;
blaster.y+=joy_state.lY;

// test bounds
if (blaster.x > screen_width-32)
    blaster.x = screen_width-32;
else
if (blaster.x < 0)
    blaster.x = 0;

if (blaster.y > screen_height-32)
    blaster.y = screen_height-32;
else
if (blaster.y < screen_height-128)
    blaster.y = screen_height-128;

// is player firing?
if (joy_state.rgbButtons[0])
   Start_Missile();

// move and draw missle
Move_Missile();
Draw_Missile();

// is it time to blink eyes
if ((rand()%100)==50)
   Set_Animation_BOB(&blaster,0);

// draw blaster
Animate_BOB(&blaster);
Draw_BOB(&blaster,lpddsback);

// draw some text
Draw_Text_GDI("Blast Those Mushrooms!",0,0,RGB(0,0,255),lpddsback);

// display joystick
sprintf(buffer,"Joystick: X-Axis=%d, Y-Axis=%d, buttons(%d,%d,%d,%d)",joy_state.lX,joy_state.lY,
                                                                      joy_state.rgbButtons[0],
                                                                      joy_state.rgbButtons[1],
                                                                      joy_state.rgbButtons[2],
                                                                      joy_state.rgbButtons[3]);

Draw_Text_GDI(buffer,0,screen_height-20,RGB(255,0,0),lpddsback);

// print out name of joystick
Draw_Text_GDI(joyname,0,screen_height-40,RGB(255,255,50),lpddsback);

// flip the surfaces
DD_Flip();

// sync to 40ish fps
Wait_Clock(20);

// return success
return(1);

} // end Game_Main

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