Windows Game Programming for Dummies (2nd Edition)/WinGamProgFD.iso/pc/Source/GPCHAP13/PROG13_3.CPP

C/C++ Source or Header | 2002-04-29 | 15.0 KB | 523 lines

// PROG13_3.CPP - Loading and playing a voc file
// with real-time manipulation

// 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
#include <dsound.h>

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

// directx 7+ compatibility, MS got rid of this constant, but I like it
#ifndef DSBCAPS_CTRLDEFAULT
#define DSBCAPS_CTRLDEFAULT (DSBCAPS_CTRLFREQUENCY | DSBCAPS_CTRLPAN | DSBCAPS_CTRLVOLUME )
#endif


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

#define WINDOW_WIDTH  320              // size of window
#define WINDOW_HEIGHT 240
#define SCREEN_WIDTH  640              // size of screen
#define SCREEN_HEIGHT 480
#define SCREEN_BPP    8                // bits per pixel

#define NVB_SIZE      6 // size of new voice block in bytes

// 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)

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

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

// this structure holds a loaded sound
typedef struct VOC_FILE_TYP
        {
        int sample_rate; // sample rate of sound
        int length;      // length of sound data
        LPDIRECTSOUNDBUFFER lpdsbuffer; // ptr to sound buffer
        } VOC_FILE, *VOC_FILE_PTR;

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

int Game_Init(void *parms=NULL);
int Game_Shutdown(void *parms=NULL);
int Game_Main(void *parms=NULL);
int Load_VOC(char *voc_file, VOC_FILE_PTR voc_data);

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

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

LPDIRECTSOUND        lpds;           // directsound interface pointer
DSBUFFERDESC        dsbd;           // directsound description
DSCAPS                dscaps;         // directsound caps
HRESULT                dsresult;       // general directsound result
DSBCAPS             dsbcaps;        // directsound buffer caps

LPDIRECTSOUNDBUFFER    lpdsbprimary,    // you won't need this normally
                    lpdsbsecondary;  // the sound buffers

WAVEFORMATEX        pcmwf;          // generic waveformat structure

VOC_FILE            work_voc;       // a working voc file

HWND                freq_hwnd,      // window handles for controls
                    volume_hwnd,
                    pan_hwnd;

// 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);

         // first the static text
         // set the color
         SetTextColor(hdc,RGB(0,0,255));
         SetBkColor(hdc,RGB(0,0,0));
         SetBkMode(hdc,OPAQUE);

         TextOut(hdc,160-5*7,40-20,"VOLUME        ",strlen("VOLUME        "));
         TextOut(hdc,160-5*13,100-20,"PLAYBACK RATE        ",strlen("PLAYBACK RATE        "));
         TextOut(hdc,160-5*14,160-20,"STEREO PANNING        ",strlen("STEREO PANNING        "));

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

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

    case WM_HSCROLL:
    case WM_VSCROLL:
        {
        int nscrollcode    = (int)LOWORD(wparam); // scroll bar value
        int npos           = (int)HIWORD(wparam); // scroll box position
        HWND hwndscrollbar = (HWND)lparam;        // handle of scroll bar

        // get teh dc for printing
        hdc = GetDC(hwnd);

        // set the color
        SetTextColor(hdc,RGB(0,0,255));
        SetBkColor(hdc,RGB(0,0,0));
        SetBkMode(hdc,OPAQUE);

        // make sure that the scroll bar is being tracked
        if (nscrollcode==SB_THUMBPOSITION ||
            nscrollcode==SB_THUMBTRACK)
        {
        // what scroll bar sent message
        if (hwndscrollbar==volume_hwnd)
           {
           // re-position scroll bar
           SetScrollPos(volume_hwnd, SB_CTL,npos,TRUE);
           sprintf(buffer,"VOLUME=%d       ",-npos);

           // output text
           TextOut(hdc,160-5*7,40-20,buffer,strlen(buffer));

           // set the volume
           work_voc.lpdsbuffer->SetVolume(-npos);

           } // end if
        else
        if (hwndscrollbar==freq_hwnd)
           {
           // re-position scroll bar
           SetScrollPos(freq_hwnd, SB_CTL,npos,TRUE);
           sprintf(buffer,"PLAYBACK RATE=%d      ",npos);

           // output text
           TextOut(hdc,160-5*13,100-20,buffer,strlen(buffer));

           // set the frequency
           work_voc.lpdsbuffer->SetFrequency(npos);
           } // end if
        // what scroll bar sent message
        else
        if (hwndscrollbar==pan_hwnd)
           {
           // re-position scroll bar
           SetScrollPos(pan_hwnd, SB_CTL,npos,TRUE);
           sprintf(buffer,"STEREO PANNING=%d      ",-(npos-10000));

           // output text
           TextOut(hdc,160-5*14,160-20,buffer,strlen(buffer));

           // set the stereo panning
           work_voc.lpdsbuffer->SetPan(-(npos-10000));
           } // end if

        } // end if

        // release the dc
        ReleaseDC(hwnd,hdc);

        // message has been processed
        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 - 2001",     // title
                          WS_OVERLAPPEDWINDOW | 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;

// create some scroll controls to change volume, frequency
// and panning

// create the volume control scroller
volume_hwnd = CreateWindow("SCROLLBAR", // class
                          "",        // title
                          WS_CHILD | WS_VISIBLE,
                           80,40,        // x,y
                          160,       // width
                          16,      // height
                          hwnd,        // handle to parent
                          NULL,        // handle to menu
                          hinstance,// instance
                          NULL);    // creation parms

// create the frequency control scroller
freq_hwnd = CreateWindow("SCROLLBAR", // class
                          "",        // title
                          WS_CHILD | WS_VISIBLE,
                           80,100,        // x,y
                          160,       // width
                          16,      // height
                          hwnd,        // handle to parent
                          NULL,        // handle to menu
                          hinstance,// instance
                          NULL);    // creation parms

// create the stereo panning control scroller
pan_hwnd = CreateWindow("SCROLLBAR", // class
                          "",        // title
                          WS_CHILD | WS_VISIBLE,
                           80,160,    // x,y
                          160,      // width
                          16,       // height
                          hwnd,        // handle to parent
                          NULL,        // handle to menu
                          hinstance,// instance
                          NULL);    // creation parms


// set range and value of each scroll bar
SetScrollRange(volume_hwnd, SB_CTL, 0, 4000,TRUE);
SetScrollPos(volume_hwnd, SB_CTL,0,TRUE);

SetScrollRange(freq_hwnd, SB_CTL, 0, 50000,TRUE);
SetScrollPos(freq_hwnd, SB_CTL,11000,TRUE);

SetScrollRange(pan_hwnd, SB_CTL, 0, 20000,TRUE);
SetScrollPos(pan_hwnd, SB_CTL,10000,TRUE);

// perform all game console specific initialization
// start up the directsound sound
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 a directsound object
if (DirectSoundCreate(NULL, &lpds, NULL)!=DS_OK )
    return(0);

// set cooperation level
if (lpds->SetCooperativeLevel(main_window_handle,DSSCL_NORMAL)!=DS_OK)
    return(0);

// load a voc file in
if (Load_VOC("DAVE.VOC",&work_voc))
   {
   // start the voc playing in looping mode
   work_voc.lpdsbuffer->Play(0,0,DSBPLAY_LOOPING);
   } // end if

// 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

// release the sound buffer
if (work_voc.lpdsbuffer)
   work_voc.lpdsbuffer->Release();

// release the directsoundobject
if (lpds!=NULL)
   lpds->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!

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

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

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

int Load_VOC(char *filename,VOC_FILE_PTR voc_data)
{
// this function creates a sound from the send voc_file_ptr
// description and returns a pointer to it

int        index,         // looping var
        data_offset,   // working var
        playback_rate, // temp playback rate
        data_length;   // used to hold data length

ULONG    bytesread = 0; // actual size of total file
HANDLE    file_handle;   // file handle
UCHAR    *snd_buffer;   // temporary sound buffer to hold voc data

UCHAR    *audio_ptr_1=NULL, // pointer to lock
        *audio_ptr_2=NULL;

DWORD    audio_length_1=0,  // lengths to lock
        audio_length_2=0;

// load the voc file off disk
if (!(file_handle = CreateFile(filename,
                        GENERIC_READ,            // access (read-write) mode
                        0,                        // share mode
                        NULL,                    // pointer to security descriptor
                        OPEN_EXISTING,            // how to create
                        FILE_ATTRIBUTE_NORMAL,    // file attributes
                        NULL                    // handle to file with attributes to copy
                        )))
    return(0);

// allocate a large enough temporary buffer (hold 50 secs)
snd_buffer = (UCHAR *)malloc(640000);

// now read in the data
ReadFile(file_handle, snd_buffer, 640000, &bytesread, NULL);

// access all values
data_offset        = snd_buffer[20];
playback_rate    = (-1000000/(snd_buffer[data_offset+4]-256));
data_length     = ((*(int *)(snd_buffer+data_offset)) >> 8);

// set rate and size in data structure
voc_data->sample_rate  = playback_rate;
voc_data->length       = data_length;

// close the file
CloseHandle(file_handle);

// step three: create the sound buffer and copy voc data into buffer

// set up the format data structure
memset(&pcmwf, 0, sizeof(WAVEFORMATEX));

pcmwf.wFormatTag    = WAVE_FORMAT_PCM;
pcmwf.nChannels        = 1;
pcmwf.nSamplesPerSec= 11025;
pcmwf.nBlockAlign    = 1;
pcmwf.nAvgBytesPerSec = pcmwf.nSamplesPerSec * pcmwf.nBlockAlign;
pcmwf.wBitsPerSample= 8;
pcmwf.cbSize        = 0;

// create the sound buffer
dsbd.dwSize            = sizeof(DSBUFFERDESC);
dsbd.dwFlags        = DSBCAPS_CTRLDEFAULT | DSBCAPS_STATIC | DSBCAPS_LOCSOFTWARE ;
dsbd.dwBufferBytes    = data_length-NVB_SIZE;
dsbd.lpwfxFormat    = &pcmwf;

if (lpds->CreateSoundBuffer(&dsbd,&(voc_data->lpdsbuffer),NULL)!=DS_OK)
    return(0);

// copy data into sound buffer
if ((voc_data->lpdsbuffer)->Lock(0,
                             data_length-NVB_SIZE,
                             (void **) &audio_ptr_1,
                             &audio_length_1,
                             (void **)&audio_ptr_2,
                             &audio_length_2,
                             DSBLOCK_FROMWRITECURSOR)!=DS_OK)
                             return(0);


// copy first section of circular buffer
memcpy(audio_ptr_1, snd_buffer+data_offset+NVB_SIZE, audio_length_1);

// copy last section of circular buffer
memcpy(audio_ptr_2, (snd_buffer+data_offset+NVB_SIZE+audio_length_1),audio_length_2);

// unlock the buffer
if ((voc_data->lpdsbuffer)->Unlock(audio_ptr_1,
                                    audio_length_1,
                                    audio_ptr_2,
                                    audio_length_2)!=DS_OK)
                                    return(0);

// release the temp buffer
free(snd_buffer);

// return success
return(1);

} // end Load_Voc