Isometric Game Programming with DirectX 7.0/Isometric Game Programming.iso/source/chapter6/isohex6_2/isohex6_2.cpp

C/C++ Source or Header | 2000-05-22 | 11.9 KB | 482 lines

/*****************************************************************************
IsoHex6_2.cpp
Ernest S. Pazera
21MAY2000
Start a WIN32 Application Workspace, add in this file
Needs ddraw.lib and dxguid.lib
Needs GDICanvas.h/cpp
*****************************************************************************/

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

#include <windows.h>
#include "GDICanvas.h"
#include "ddraw.h"

//////////////////////////////////////////////////////////////////////////////
//DEFINES
//////////////////////////////////////////////////////////////////////////////
//name for our window class
#define WINDOWCLASS "ISOHEX6"
//title of the application
#define WINDOWTITLE "IsoHex 6-2"

//////////////////////////////////////////////////////////////////////////////
//PROTOTYPES
//////////////////////////////////////////////////////////////////////////////
bool Prog_Init();//game data initalizer
void Prog_Loop();//main game loop
void Prog_Done();//game clean up

//enumeration functions
HRESULT WINAPI EnumModesCallbackCount(LPDDSURFACEDESC2 lpDDSurfaceDesc, LPVOID lpContext);
HRESULT WINAPI EnumModesCallbackList(LPDDSURFACEDESC2 lpDDSurfaceDesc,LPVOID lpContext);

//////////////////////////////////////////////////////////////////////////////
//GLOBALS
//////////////////////////////////////////////////////////////////////////////
HINSTANCE hInstMain=NULL;//main application handle
HWND hWndMain=NULL;//handle to our main window
//IDirectDraw7 Pointer
LPDIRECTDRAW7 lpdd=NULL;
//display mode structure
struct DisplayMode
{
    DWORD dwWidth;
    DWORD dwHeight;
    DWORD dwBPP;
};
//display mode enumeration variables
DWORD dwDisplayModeCount=0;
DisplayMode* DisplayModeList=NULL;

//gdicanvas
CGDICanvas gdicBall;

//surfaces
LPDIRECTDRAWSURFACE7 lpddsPrime=NULL;
LPDIRECTDRAWSURFACE7 lpddsBack=NULL;
LPDIRECTDRAWSURFACE7 lpddsBall=NULL;

//size of the display
DWORD dwDisplayWidth=0;
DWORD dwDisplayHeight=0;

//position of the ball
POINT ptBallPosition;
POINT ptLastPosition[2];
//velocity of the ball
POINT ptBallVelocity;

//////////////////////////////////////////////////////////////////////////////
//WINDOWPROC
//////////////////////////////////////////////////////////////////////////////
LRESULT CALLBACK TheWindowProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
    //which message did we get?
    switch(uMsg)
    {
    case WM_KEYDOWN:
        {
            //check for escape key
            if(wParam==VK_ESCAPE)
            {
                DestroyWindow(hWndMain);
            }

            return(0);//handled message
        }break;
    case WM_DESTROY://the window is being destroyed
        {

            //tell the application we are quitting
            PostQuitMessage(0);

            //handled message, so return 0
            return(0);

        }break;
    case WM_PAINT://the window needs repainting
        {
            //a variable needed for painting information
            PAINTSTRUCT ps;

            //start painting
            HDC hdc=BeginPaint(hwnd,&ps);

            /////////////////////////////
            //painting code would go here
            /////////////////////////////

            //end painting
            EndPaint(hwnd,&ps);

            //handled message, so return 0
            return(0);
        }break;
    }

    //pass along any other message to default message handler
    return(DefWindowProc(hwnd,uMsg,wParam,lParam));
}


//////////////////////////////////////////////////////////////////////////////
//WINMAIN
//////////////////////////////////////////////////////////////////////////////
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd)
{
    //assign instance to global variable
    hInstMain=hInstance;

    //create window class
    WNDCLASSEX wcx;

    //set the size of the structure
    wcx.cbSize=sizeof(WNDCLASSEX);

    //class style
    wcx.style=CS_OWNDC | CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;

    //window procedure
    wcx.lpfnWndProc=TheWindowProc;

    //class extra
    wcx.cbClsExtra=0;

    //window extra
    wcx.cbWndExtra=0;

    //application handle
    wcx.hInstance=hInstMain;

    //icon
    wcx.hIcon=LoadIcon(NULL,IDI_APPLICATION);

    //cursor
    wcx.hCursor=LoadCursor(NULL,IDC_ARROW);

    //background color
    wcx.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);

    //menu
    wcx.lpszMenuName=NULL;

    //class name
    wcx.lpszClassName=WINDOWCLASS;

    //small icon
    wcx.hIconSm=NULL;

    //register the window class, return 0 if not successful
    if(!RegisterClassEx(&wcx)) return(0);

    //create main window
    hWndMain=CreateWindowEx(0,WINDOWCLASS,WINDOWTITLE, WS_POPUP | WS_VISIBLE,0,0,320,240,NULL,NULL,hInstMain,NULL);

    //error check
    if(!hWndMain) return(0);

    //if program initialization failed, then return with 0
    if(!Prog_Init()) return(0);

    //message structure
    MSG msg;

    //message pump
    for(;;)
    {
        //look for a message
        if(PeekMessage(&msg,NULL,0,0,PM_REMOVE))
        {
            //there is a message

            //check that we arent quitting
            if(msg.message==WM_QUIT) break;

            //translate message
            TranslateMessage(&msg);

            //dispatch message
            DispatchMessage(&msg);
        }

        //run main game loop
        Prog_Loop();
    }

    //clean up program data
    Prog_Done();

    //return the wparam from the WM_QUIT message
    return(msg.wParam);
}

//////////////////////////////////////////////////////////////////////////////
//INITIALIZATION
//////////////////////////////////////////////////////////////////////////////
bool Prog_Init()
{
    //error code
    HRESULT hr;

    //initialize the dd pointer
    hr=DirectDrawCreateEx(NULL,(void**)&lpdd,IID_IDirectDraw7,NULL);

    //example for error handling
    if(FAILED(hr))
    {
        //initialization failed
        return(false);
    }

    //set the cooperative level
    lpdd->SetCooperativeLevel(hWndMain,DDSCL_FULLSCREEN | DDSCL_EXCLUSIVE | DDSCL_ALLOWREBOOT);

    //enumerate the displaymodes
    dwDisplayModeCount=0;

    lpdd->EnumDisplayModes(0,NULL,NULL,EnumModesCallbackCount);

    DisplayModeList=new DisplayMode[dwDisplayModeCount];
    dwDisplayModeCount=0;

    lpdd->EnumDisplayModes(0,NULL,NULL,EnumModesCallbackList);

    //pick a display mode
    DisplayMode TestMode;
    TestMode.dwWidth=0;
    TestMode.dwHeight=0;
    TestMode.dwBPP=0;
    DWORD index;
    bool found=false;

    for(index=0;(index<dwDisplayModeCount);index++)
    {
        if(DisplayModeList[index].dwBPP==16)
        {
            if(DisplayModeList[index].dwWidth>TestMode.dwWidth)
            {
                TestMode.dwWidth=DisplayModeList[index].dwWidth;
                TestMode.dwHeight=DisplayModeList[index].dwHeight;
                TestMode.dwBPP=DisplayModeList[index].dwBPP;
                found=true;
            }
        }
    }

    if(!found)
    {
        return(false);
    }

    //set the display mode
    hr=lpdd->SetDisplayMode(TestMode.dwWidth,TestMode.dwHeight,TestMode.dwBPP,0,0);
    //keep display width and height in global variables
    dwDisplayWidth=TestMode.dwWidth;
    dwDisplayHeight=TestMode.dwHeight;

    //create the primary surface with a single back buffer
    //clear out a DDSURFACEDESC2
    DDSURFACEDESC2 ddsd;
    memset(&ddsd,0,sizeof(DDSURFACEDESC2));
    ddsd.dwSize=sizeof(DDSURFACEDESC2);

    //set the flags for primary surface
    ddsd.dwFlags=DDSD_BACKBUFFERCOUNT | DDSD_CAPS;
    //set back buffer count
    ddsd.dwBackBufferCount=1;
    //set caps
    ddsd.ddsCaps.dwCaps=DDSCAPS_PRIMARYSURFACE | DDSCAPS_COMPLEX | DDSCAPS_FLIP;

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

    //clear out a DDSCAPS2
    DDSCAPS2 ddsCaps;
    memset(&ddsCaps,0,sizeof(DDSCAPS2));

    //set the caps
    ddsCaps.dwCaps=DDSCAPS_BACKBUFFER;

    //retrieve back buffer
    lpddsPrime->GetAttachedSurface(&ddsCaps,&lpddsBack);

    //do an initial clearing out of the back buffer
    //clean out a DDBLTFX
    DDBLTFX ddbltfx;
    memset(&ddbltfx,0,sizeof(DDBLTFX));
    ddbltfx.dwSize=sizeof(DDBLTFX);

    //set the fill color to black
    ddbltfx.dwFillColor=0;

    //do a color fill
    lpddsBack->Blt(NULL,NULL,NULL,DDBLT_WAIT | DDBLT_COLORFILL, &ddbltfx);

    //load in the ball image
    gdicBall.Load(NULL,"IsoHex6_2.bmp");

    //create an offscreen surface to contain the ball
    //clear out ddsd
    memset(&ddsd,0,sizeof(DDSURFACEDESC2));
    ddsd.dwSize=sizeof(DDSURFACEDESC2);

    //set ddsd flags
    ddsd.dwFlags=DDSD_WIDTH | DDSD_HEIGHT | DDSD_CAPS;

    //set width and height
    ddsd.dwWidth=gdicBall.GetWidth();
    ddsd.dwHeight=gdicBall.GetHeight();

    //set caps
    ddsd.ddsCaps.dwCaps=DDSCAPS_OFFSCREENPLAIN;

    //create surface
    lpdd->CreateSurface(&ddsd,&lpddsBall,NULL);

    //grab dc from offscreen surface
    HDC hdcSurf;
    lpddsBall->GetDC(&hdcSurf);

    //blit ball to surface
    BitBlt(hdcSurf,0,0,gdicBall.GetWidth(),gdicBall.GetHeight(),gdicBall,0,0,SRCCOPY);

    //release dc
    lpddsBall->ReleaseDC(hdcSurf);

    //initialize ball position and velocity
    ptBallPosition.x=0;
    ptBallPosition.y=0;
    ptLastPosition[0].x=0;
    ptLastPosition[0].y=0;
    ptLastPosition[1].x=0;
    ptLastPosition[1].y=0;

    ptBallVelocity.x=16;
    ptBallVelocity.y=8;

    return(true);//return success
}

//////////////////////////////////////////////////////////////////////////////
//CLEANUP
//////////////////////////////////////////////////////////////////////////////
void Prog_Done()
{
    //clean up ball surface
    if(lpddsBall)
    {
        lpddsBall->Release();
        lpddsBall=NULL;
    }

    //clean up primary surface(this will clean up the back buffer, also)
    if(lpddsPrime)
    {
        lpddsPrime->Release();
        lpddsPrime=NULL;
        lpddsBack=NULL;
    }

    //clean up the dd pointer
    if(lpdd)
    {
        lpdd->Release();
        lpdd=NULL;
    }

    //clean up gdicanvas
    gdicBall.Destroy();

    //get rid of enumeration stuff
    delete [] DisplayModeList;
}

//////////////////////////////////////////////////////////////////////////////
//MAIN GAME LOOP
//////////////////////////////////////////////////////////////////////////////
void Prog_Loop()
{
    //set up rectangle for filling
    RECT rcFill;
    SetRect(&rcFill,ptLastPosition[0].x,ptLastPosition[0].y,ptLastPosition[0].x+gdicBall.GetWidth(),ptLastPosition[0].y+gdicBall.GetHeight());

    //set up a ddbltfx
    DDBLTFX ddbltfx;
    memset(&ddbltfx,0,sizeof(DDBLTFX));
    ddbltfx.dwSize=sizeof(DDBLTFX);

    //set up a color fill of black
    ddbltfx.dwFillColor=0;

    //blt the color fill to the back buffer
    lpddsBack->Blt(&rcFill,NULL,NULL,DDBLT_WAIT | DDBLT_COLORFILL, &ddbltfx);

    //set up source and destination rects for blitting the ball
    RECT rcSrc;
    RECT rcDst;

    SetRect(&rcSrc,0,0,gdicBall.GetWidth(),gdicBall.GetHeight());
    CopyRect(&rcDst,&rcSrc);
    OffsetRect(&rcDst,ptBallPosition.x,ptBallPosition.y);

    //blit the ball
    lpddsBack->Blt(&rcDst,lpddsBall,&rcSrc,DDBLT_WAIT, NULL);

    //copy current position of ball to old position
    ptLastPosition[0]=ptLastPosition[1];
    ptLastPosition[1]=ptBallPosition;

    //move the ball
    ptBallPosition.x+=ptBallVelocity.x;
    ptBallPosition.y+=ptBallVelocity.y;

    //bounds checking
    //left side
    if(ptBallPosition.x<=0) ptBallVelocity.x=abs(ptBallVelocity.x);
    //top side
    if(ptBallPosition.y<=0) ptBallVelocity.y=abs(ptBallVelocity.y);
    //right side
    if(ptBallPosition.x>=(int)dwDisplayWidth-gdicBall.GetWidth()) ptBallVelocity.x=-abs(ptBallVelocity.x);
    //bottom side
    if(ptBallPosition.y>=(int)dwDisplayHeight-gdicBall.GetHeight()) ptBallVelocity.y=-abs(ptBallVelocity.y);

    //flip surfaces
    lpddsPrime->Flip(NULL,DDFLIP_WAIT);
}

//enumeration-count
HRESULT WINAPI EnumModesCallbackCount(
  LPDDSURFACEDESC2 lpDDSurfaceDesc,
  LPVOID lpContext
)
{
    //increment the count variable
    dwDisplayModeCount++;

    //continue the enumeration
    return(DDENUMRET_OK);
}

//enumeration-list
HRESULT WINAPI EnumModesCallbackList(
  LPDDSURFACEDESC2 lpDDSurfaceDesc,
  LPVOID lpContext
)
{
    //copy applicable information to the list
    DisplayModeList[dwDisplayModeCount].dwWidth=lpDDSurfaceDesc->dwWidth;
    DisplayModeList[dwDisplayModeCount].dwHeight=lpDDSurfaceDesc->dwHeight;
    DisplayModeList[dwDisplayModeCount].dwBPP=lpDDSurfaceDesc->ddpfPixelFormat.dwRGBBitCount;

    //increment the count variable
    dwDisplayModeCount++;

    //continue the enumeration
    return(DDENUMRET_OK);
}