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Hellfire/Storm/SAMPLES/SNET/RPG/RPG.CPP
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Justin Marshall 101266ab72 Initial commit.
2026-04-27 10:35:40 -07:00

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/****************************************************************************
*
* RPG.CPP
*
* This is a simple game which demonstrates the use of synchonous networking.
* It is basically an Ultima IV style tiled graphics engine, with Warcraft
* style mouse controls.
*
* At the beginning of the game, each player sends out two null orders.
* During the game, players send out orders as they are received from the
* user (a sample order would be "move to this location"), and fabricate
* null orders as necessary to make sure there are always at least two in
* transit.
*
* Each turn, each player waits until he has received the next set of orders
* from all players, and then executes all orders, starting at the lowest
* player number. Since orders are processed at the same time and in the
* same order on every computer in the network, the game stays in sync.
*
***/
#include <windows.h>
#include <storm.h>
#include "bnetart.h"
#define PROGRAMID 'RPG1'
#define VERSIONID 1
#define MAXPLAYERS 8
#define TITLE "RPG Example"
#define ARTDIR "art\\"
#define NETARTDIR "netart\\"
#define ORDER_NULL 0
#define ORDER_START 1
#define ORDER_MOVE 2
#define ORDER_QUIT 3
#define TILE_DEEPSEA 0
#define TILE_SEA 1
#define TILE_SHALLOWSEA 2
#define TILE_SWAMP 3
#define TILE_GRASS 4
#define TILE_BRUSH 5
#define TILE_FOREST 6
#define TILE_HILLS 7
#define TILE_MOUNTAINS 8
#define TILE_DUNGEON 9
#define TILE_TOWN 10
#define TILE_CASTLE 11
#define TILE_VILLAGE 12
#define SCREENCX 640
#define SCREENCY 480
#define SCREENTILESX 20
#define SCREENTILESY 15
#define SCROLLCX 672
#define SCROLLCY 512
#define SCROLLTILESX 21
#define SCROLLTILESY 16
#define TILES 16
#define TILECX 32
#define TILECY 32
#define WORLDMAPCX 256
#define WORLDMAPCY 256
LPBYTE cursor = NULL;
POINT cursorpos = {0,0};
DWORD localplayer = 0;
POINT orderpos[MAXPLAYERS];
PALETTEENTRY pe[256];
LPBYTE player = NULL;
POINT playerpos[MAXPLAYERS];
DWORD players = 0;
LPBYTE scrollbuffer = NULL;
POINT scrollpos;
POINT scrollvel = {0,0};
BOOL started = 0;
LPBYTE tileset = NULL;
LPBYTE worldmap = NULL;
BOOL CALLBACK CreateCallback (SNETCREATEDATAPTR createdata,
SNETPROGRAMDATAPTR programdata,
SNETPLAYERDATAPTR playerdata,
SNETUIDATAPTR interfacedata,
SNETVERSIONDATAPTR versiondata,
DWORD *playerid);
BOOL LoadGraphicsData ();
void MovePlayer (DWORD player);
void CALLBACK OnButtonDown (LPPARAMS params);
void CALLBACK OnClose (LPPARAMS params);
void CALLBACK OnEraseBkgnd (LPPARAMS params);
void CALLBACK OnPaint (LPPARAMS params);
void CALLBACK OnVkEscape (LPPARAMS params);
void CALLBACK OnVkSpace (LPPARAMS params);
BOOL ProcessOrders ();
BOOL UpdateScrollVelocity ();
//===========================================================================
BOOL CALLBACK ArtCallback (DWORD providerid,
DWORD artid,
LPPALETTEENTRY pe,
LPBYTE buffer,
DWORD buffersize,
int *width,
int *height,
int *bitdepth) {
char filename[MAX_PATH] = "";
if (providerid == 'BNET') {
// Check for battlenet specific art
switch (artid) {
case SNET_ART_BACKGROUND: strcpy(filename,NETARTDIR "chat_bkg.pcx"); break;
case SNET_ART_BATTLE_LISTBOX: strcpy(filename, NETARTDIR "bnlist.pcx"); break;
case SNET_ART_BATTLE_BTNS: strcpy(filename, NETARTDIR "bnbuttns.pcx"); break;
case SNET_ART_BATTLE_HELP_BKG: strcpy(filename, NETARTDIR "lpopup.pcx"); break;
case SNET_ART_JOINBACKGROUND: strcpy(filename, NETARTDIR "bnjoinbg.pcx"); break;
case SNET_ART_BATTLE_REDLAG: strcpy(filename, NETARTDIR "redlag.pcx"); break;
case SNET_ART_BATTLE_YELLOWLAG: strcpy(filename, NETARTDIR "yellolag.pcx"); break;
case SNET_ART_BATTLE_GREENLAG: strcpy(filename, NETARTDIR "greenlag.pcx"); break;
}
}
else if ((providerid == 'IPXN') || (providerid == 'TEST')) {
switch (artid) {
case SNET_ART_BACKGROUND: strcpy(filename, NETARTDIR "ipx_bkg.pcx"); break;
}
}
else if (providerid == 0) {
switch (artid) {
case SNET_ART_BACKGROUND: strcpy(filename, NETARTDIR "connect.pcx"); break;
}
}
if (!filename[0]) {
// Check for generic artwork
switch (artid) {
case SNET_ART_JOINBACKGROUND: // fall through
case SNET_ART_BACKGROUND: strcpy(filename,NETARTDIR "menu.pcx"); break;
case SNET_ART_BUTTONTEXTURE: strcpy(filename,NETARTDIR "but_lrg.pcx"); break;
case SNET_ART_POPUPBACKGROUND: strcpy(filename,NETARTDIR "lpopup.pcx"); break;
case SNET_ART_HELPBACKGROUND: strcpy(filename,NETARTDIR "lpopup.pcx"); break;
case SNET_ART_BUTTON_XSML: strcpy(filename,NETARTDIR "but_xsm.pcx"); break;
case SNET_ART_BUTTON_SML: strcpy(filename,NETARTDIR "but_sml.pcx"); break;
case SNET_ART_BUTTON_MED: strcpy(filename,NETARTDIR "but_med.pcx"); break;
case SNET_ART_BUTTON_LRG: strcpy(filename,NETARTDIR "but_lrg.pcx"); break;
}
}
if (filename[0])
return SBmpLoadImage(filename,pe,buffer,buffersize,width,height,bitdepth);
else
return 0;
}
//===========================================================================
void ChooseStartingLocations () {
for (DWORD loop = 0; loop < MAXPLAYERS; ++loop) {
BOOL found = 0;
while (!found) {
int x = rand() % WORLDMAPCX;
int y = rand() % WORLDMAPCY;
if (*(worldmap+y*WORLDMAPCX+x) == TILE_GRASS) {
found = 1;
for (DWORD loop2 = 1; loop2 < loop; ++loop2)
if ((playerpos[loop2].x == x) && (playerpos[loop2].y == y))
found = 0;
if (found) {
orderpos[loop].x = x;
orderpos[loop].y = y;
playerpos[loop].x = x;
playerpos[loop].y = y;
}
}
}
}
}
//===========================================================================
BOOL Connect () {
// BUILD A PROGRAM DATA RECORD
SNETPROGRAMDATA programdata;
ZeroMemory(&programdata,sizeof(SNETPROGRAMDATA));
programdata.size = sizeof(SNETPROGRAMDATA);
programdata.programname = TITLE;
programdata.programid = PROGRAMID;
programdata.versionid = VERSIONID;
programdata.maxplayers = MAXPLAYERS;
// GENERATE A PLAYER NAME
char computername[MAX_COMPUTERNAME_LENGTH+1] = "";
DWORD size = MAX_COMPUTERNAME_LENGTH+1;
GetComputerName(computername,&size);
// BUILD A PLAYER DATA RECORD
SNETPLAYERDATA playerdata;
ZeroMemory(&playerdata,sizeof(SNETPLAYERDATA));
playerdata.size = sizeof(SNETPLAYERDATA);
playerdata.playername = computername;
// BUILD AN INTERFACE DATA RECORD
SNETUIDATA interfacedata;
ZeroMemory(&interfacedata,sizeof(SNETUIDATA));
interfacedata.size = sizeof(SNETUIDATA);
interfacedata.parentwindow = SDrawGetFrameWindow();
interfacedata.artcallback = ArtCallback;
interfacedata.createcallback = CreateCallback;
// SELECT A NETWORK PROVIDER
while (SNetSelectProvider(NULL,
&programdata,
&playerdata,
&interfacedata,
NULL,
NULL)) {
// SELECT A GAME
if (SNetSelectGame(0,
&programdata,
&playerdata,
&interfacedata,
NULL,
&localplayer))
return 1;
}
return 0;
}
//===========================================================================
BOOL CALLBACK ConnectIdleProc (DWORD) {
DWORD currtime = GetTickCount();
// TWICE A SECOND, UPDATE THE LIST OF PLAYERS
{
static DWORD lasttime = 0;
if (currtime-lasttime > 1000)
lasttime = currtime-500;
while (currtime-lasttime >= 500) {
// DRAW THE LIST
LPBYTE videobuffer;
int videopitch;
if (SDrawLockSurface(SDRAW_SURFACE_FRONT,NULL,&videobuffer,&videopitch)) {
SGdiSetPitch(videopitch);
SNetGetNumPlayers(NULL,&players,NULL);
++players;
for (DWORD loop = 0; loop < players; ++loop) {
char buffer[SNET_MAXNAMELENGTH+2] = "0 ";
buffer[0] += (char)loop;
if (SNetGetPlayerName(loop,buffer+2,SNET_MAXNAMELENGTH))
SGdiTextOut(videobuffer,4,loop*20,PALETTEINDEX(255-loop),buffer);
}
SGdiTextOut(videobuffer,440,20,PALETTEINDEX(255),"PRESS SPACE TO START");
SDrawUnlockSurface(SDRAW_SURFACE_FRONT,videobuffer);
}
lasttime += 500;
}
}
// FOUR TIMES A SECOND, PROCESS ORDERS
{
static DWORD lasttime = 0;
if (currtime-lasttime > 1000)
lasttime = currtime-250;
while (currtime-lasttime >= 250) {
if (ProcessOrders())
lasttime += 250;
else
lasttime = GetTickCount();
currtime = GetTickCount();
}
}
return 1;
}
//===========================================================================
BOOL CALLBACK CreateCallback (SNETCREATEDATAPTR createdata,
SNETPROGRAMDATAPTR programdata,
SNETPLAYERDATAPTR playerdata,
SNETUIDATAPTR interfacedata,
SNETVERSIONDATAPTR versiondata,
DWORD *playerid) {
return SNetCreateGame(playerdata->playername,
NULL,
NULL,
0,
NULL,
0,
createdata->maxplayers,
playerdata->playername,
NULL,
playerid);
}
//===========================================================================
BOOL CreateScrollBuffer () {
scrollbuffer = (LPBYTE)ALLOC(SCROLLTILESX*TILECX*SCROLLTILESY*TILECY);
return (scrollbuffer != NULL);
}
//===========================================================================
void Destroy () {
if (cursor) {
FREE(cursor);
cursor = NULL;
}
if (player) {
FREE(player);
player = NULL;
}
if (scrollbuffer) {
FREE(scrollbuffer);
scrollbuffer = NULL;
}
if (tileset) {
FREE(tileset);
tileset = NULL;
}
if (worldmap) {
FREE(worldmap);
worldmap = NULL;
}
}
//===========================================================================
void DrawScreen () {
LPBYTE videobuffer;
int pitch;
if (SDrawLockSurface(SDRAW_SURFACE_BACK,NULL,&videobuffer,&pitch)) {
int startx = scrollpos.x % SCROLLCX;
int starty = scrollpos.y % SCROLLCY;
// BLT FROM THE SCROLL BUFFER ONTO THE BACK SURFACE
SBltROP3(videobuffer,
scrollbuffer+starty*SCROLLCX+startx,
min(SCREENCX,SCROLLCX-startx),
min(SCREENCY,SCROLLCY-starty),
pitch,
SCROLLCX,
0,
SRCCOPY);
if (SCROLLCX-startx < SCREENCX)
SBltROP3(videobuffer+SCROLLCX-startx,
scrollbuffer+starty*SCROLLCX,
SCREENCX+startx-SCROLLCX,
min(SCREENCY,SCROLLCY-starty),
pitch,
SCROLLCX,
0,
SRCCOPY);
if (SCROLLCY-starty < SCREENCY)
SBltROP3(videobuffer+(SCROLLCY-starty)*pitch,
scrollbuffer+startx,
min(SCREENCX,SCROLLCX-startx),
SCREENCY+starty-SCROLLCY,
pitch,
SCROLLCX,
0,
SRCCOPY);
if ((SCROLLCX-startx < SCREENCX) &&
(SCROLLCY-starty < SCREENCY))
SBltROP3(videobuffer+(SCROLLCY-starty)*pitch+SCROLLCX-startx,
scrollbuffer,
SCREENCX+startx-SCROLLCX,
SCREENCY+starty-SCROLLCY,
pitch,
SCROLLCX,
0,
SRCCOPY);
// DRAW THE MOUSE CURSOR ONTO THE BACK SURFACE
if (started) {
GetCursorPos(&cursorpos);
SBltROP3(videobuffer+cursorpos.y*pitch+cursorpos.x,
cursor,
min(32,SCREENCX-cursorpos.x),
min(32,SCREENCY-cursorpos.y),
pitch,
32,
0,
SRCPAINT);
}
SDrawUnlockSurface(SDRAW_SURFACE_BACK,videobuffer);
SDrawFlipPage();
}
}
//===========================================================================
void FillScrollBuffer (LPRECT rect) {
int startxtile = scrollpos.x/TILECX;
int startytile = scrollpos.y/TILECY;
int startxpos = (scrollpos.x % SCROLLCX)/TILECX;
int startypos = (scrollpos.y % SCROLLCY)/TILECY;
for (int y = rect->top; y <= rect->bottom; ++y) {
int mapy = startytile+y+((y >= startypos) ? 0 : SCROLLTILESY)-startypos;
for (int x = rect->left; x <= rect->right; ++x) {
int mapx = startxtile+x+((x >= startxpos) ? 0 : SCROLLTILESX)-startxpos;
int tile = min(TILES-1,*(worldmap+mapy*WORLDMAPCX+mapx));
SBltROP3(scrollbuffer+y*TILECY*SCROLLCX+x*TILECX,
tileset+tile*TILECX,
TILECX,
TILECY,
SCROLLCX,
TILES*TILECX,
0,
SRCCOPY);
}
}
for (DWORD loop = 0; loop < players; ++loop) {
if ((playerpos[loop].x >= startxtile) &&
(playerpos[loop].y >= startytile) &&
(playerpos[loop].x < startxtile+SCROLLTILESX) &&
(playerpos[loop].y < startytile+SCROLLTILESY)) {
int posx = (startxpos+(playerpos[loop].x-startxtile)) % SCROLLTILESX;
int posy = (startypos+(playerpos[loop].y-startytile)) % SCROLLTILESY;
if ((posx >= rect->left) && (posx <= rect->right) &&
(posy >= rect->top) && (posy <= rect->bottom)) {
DWORD pattern = ((255-loop) << 24) | ((255-loop) << 16) | ((255-loop) << 8) | (255-loop);
// pattern 11110000
// source 11001100
// dest 10101010
// --------
// rop 11100010 = 0xE2
SBltROP3(scrollbuffer+posy*TILECY*SCROLLCX+posx*TILECX,
player,
TILECX,
TILECY,
SCROLLCX,
TILECX,
pattern,
0xE20746);
}
}
}
}
//===========================================================================
BOOL CALLBACK GameIdleProc (DWORD) {
DWORD currtime = GetTickCount();
// FOUR TIMES A SECOND, MOVE THE PLAYERS
{
static DWORD lasttime = GetTickCount();
if (currtime-lasttime > 1000)
lasttime = currtime-250;
while (currtime-lasttime >= 250) {
for (DWORD loop = 0; loop < players; ++loop)
MovePlayer(loop);
RECT rect = {0,0,SCROLLTILESX-1,SCROLLTILESY-1};
FillScrollBuffer(&rect);
lasttime += 250;
}
}
// TWICE A SECOND, PROCESS ORDERS
{
static DWORD lasttime = GetTickCount();
if (currtime-lasttime > 2000)
lasttime = currtime-500;
while (currtime-lasttime >= 500) {
if (ProcessOrders())
lasttime += 500;
else
lasttime = GetTickCount();
currtime = GetTickCount();
}
}
// PROCESS SCROLLING
if (UpdateScrollVelocity()) {
// UPDATE THE SCROLL POSITION
POINT oldscrollpos = scrollpos;
scrollpos.x = max(0,min(WORLDMAPCX*TILECX-SCROLLCX,scrollpos.x+scrollvel.x));
scrollpos.y = max(0,min(WORLDMAPCY*TILECY-SCROLLCY,scrollpos.y+scrollvel.y));
// UPDATE THE SCROLL BUFFER
if (scrollpos.x/TILECX != oldscrollpos.x/TILECX) {
int updatex = (scrollvel.x > 0) ? (oldscrollpos.x % SCROLLCX)/TILECX
: (scrollpos.x % SCROLLCX)/TILECX;
RECT rect = {updatex,0,updatex,SCROLLTILESY-1};
FillScrollBuffer(&rect);
}
if (scrollpos.y/TILECY != oldscrollpos.y/TILECY) {
int updatey = (scrollvel.y > 0) ? (oldscrollpos.y % SCROLLCY)/TILECY
: (scrollpos.y % SCROLLCY)/TILECY;
RECT rect = {0,updatey,SCROLLTILESX-1,updatey};
FillScrollBuffer(&rect);
}
}
// DRAW THE SCREEN
DrawScreen();
return 1;
}
//===========================================================================
BOOL CALLBACK IdleProc (DWORD count) {
if (started)
return GameIdleProc(count);
else
return ConnectIdleProc(count);
}
//===========================================================================
void IssueOrder (LPDWORD paramarray, DWORD paramcount) {
SNetSendTurn(paramarray,
paramcount*sizeof(DWORD));
}
//===========================================================================
BOOL Initialize (HINSTANCE instance) {
if (!SDrawAutoInitialize(instance,
TITLE "_CLASS",
TITLE,
NULL,
SDRAW_SERVICE_PAGEFLIP)) {
SDrawMessageBox("Unable to initialize DirectDraw.",TITLE,0);
return 0;
}
if (!LoadGraphicsData()) {
SDrawMessageBox("Unable to load graphics data.",TITLE,0);
return 0;
}
if (!CreateScrollBuffer()) {
SDrawMessageBox("Out of memory.",TITLE,0);
return 0;
}
SMsgRegisterMessage(NULL,WM_ERASEBKGND,OnEraseBkgnd);
if (!Connect())
return 0;
ChooseStartingLocations();
scrollpos.x = max(0,min(WORLDMAPCX*TILECX-SCROLLCX,playerpos[localplayer].x*TILECX-SCROLLCX/2));
scrollpos.y = max(0,min(WORLDMAPCY*TILECY-SCROLLCY,playerpos[localplayer].y*TILECY-SCROLLCY/2));
SDrawUpdatePalette(0,256,&pe[0]);
SMsgRegisterMessage(NULL,WM_CLOSE ,OnClose);
SMsgRegisterMessage(NULL,WM_LBUTTONDOWN,OnButtonDown);
SMsgRegisterMessage(NULL,WM_PAINT ,OnPaint);
SMsgRegisterMessage(NULL,WM_RBUTTONDOWN,OnButtonDown);
SMsgRegisterKeyDown(NULL,VK_ESCAPE ,OnVkEscape);
SMsgRegisterKeyDown(NULL,VK_SPACE ,OnVkSpace);
return 1;
}
//===========================================================================
BOOL LoadGraphicsData () {
// LOAD IN THE CURSOR
cursor = (LPBYTE)ALLOC(32*32);
if (!cursor)
return 0;
if (!SBmpLoadImage(ARTDIR "cursor.pcx",NULL,cursor,32*32))
return 0;
// LOAD IN THE PLAYER IMAGE
player = (LPBYTE)ALLOC(32*32);
if (!player)
return 0;
if (!SBmpLoadImage(ARTDIR "player.pcx",NULL,player,32*32))
return 0;
// LOAD IN THE WORLD MAP
worldmap = (LPBYTE)ALLOC(WORLDMAPCX*WORLDMAPCY);
if (!worldmap)
return 0;
if (!SBmpLoadImage(ARTDIR "map.pcx",NULL,worldmap,WORLDMAPCX*WORLDMAPCY))
return 0;
// LOAD IN THE GRAPHICS TILESET
tileset = (LPBYTE)ALLOC(TILES*TILECX*TILECY);
if (!tileset)
return 0;
if (!SBmpLoadImage(ARTDIR "tileset.pcx",&pe[0],tileset,TILES*TILECX*TILECY))
return 0;
// CREATE A FONT
HSGDIFONT font;
{
HFONT winfont = CreateFont(-17,0,0,0,FW_BOLD,0,0,0,ANSI_CHARSET,
OUT_DEFAULT_PRECIS,CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,
VARIABLE_PITCH | FF_ROMAN,TEXT("Times New Roman"));
if (!SGdiImportFont(winfont,&font))
return 0;
DeleteObject(winfont);
}
if (!SGdiSelectObject(font))
return 0;
return 1;
}
//===========================================================================
void MovePlayer (DWORD player) {
int xdir = orderpos[player].x-playerpos[player].x;
xdir = (xdir > 0) ? 1 : xdir ? -1 : 0;
int ydir = orderpos[player].y-playerpos[player].y;
ydir = (ydir > 0) ? 1 : ydir ? -1 : 0;
if (xdir) {
BYTE tile = *(worldmap+playerpos[player].y*WORLDMAPCX+playerpos[player].x+xdir);
if ((tile >= TILE_GRASS) && (tile != TILE_MOUNTAINS))
playerpos[player].x += xdir;
}
if (ydir) {
BYTE tile = *(worldmap+(playerpos[player].y+ydir)*WORLDMAPCX+playerpos[player].x);
if ((tile >= TILE_GRASS) && (tile != TILE_MOUNTAINS))
playerpos[player].y += ydir;
}
}
//===========================================================================
void CALLBACK OnButtonDown (LPPARAMS params) {
if (started) {
DWORD order[3] = {ORDER_MOVE,
(scrollpos.x+LOWORD(params->lparam))/TILECX,
(scrollpos.y+HIWORD(params->lparam))/TILECY};
IssueOrder(&order[0],3);
}
}
//===========================================================================
void CALLBACK OnClose (LPPARAMS) {
Destroy();
}
//===========================================================================
void CALLBACK OnEraseBkgnd (LPPARAMS params) {
params->useresult = 1;
params->result = 1;
}
//===========================================================================
void CALLBACK OnPaint (LPPARAMS params) {
if (scrollbuffer && tileset) {
RECT rect = {0,0,SCROLLTILESX-1,SCROLLTILESY-1};
FillScrollBuffer(&rect);
DrawScreen();
}
}
//===========================================================================
void CALLBACK OnVkEscape (LPPARAMS) {
DWORD order = ORDER_QUIT;
IssueOrder(&order,1);
}
//===========================================================================
void CALLBACK OnVkSpace (LPPARAMS) {
if (!started) {
DWORD order = ORDER_START;
IssueOrder(&order,1);
}
}
//===========================================================================
BOOL ProcessOrders () {
// MAKE SURE THERE ARE ALWAYS AT LEAST TWO ORDERS IN TRANSIT
{
DWORD turns;
if (SNetGetTurnsInTransit(&turns)) {
while (turns < 2) {
DWORD order = ORDER_NULL;
IssueOrder(&order,1);
++turns;
}
}
}
// GATHER ORDERS FROM ALL PLAYERS
LPDWORD data[MAXPLAYERS];
DWORD databytes[MAXPLAYERS];
DWORD playerstatus[MAXPLAYERS];
BOOL insync = 1;
{
int timeout = 20;
while ((!SNetReceiveTurns(0,players,(LPVOID *)&data[0],&databytes[0],&playerstatus[0])) &&
--timeout) {
insync = 0;
Sleep(50);
}
if (!timeout) {
SDrawMessageBox("network error",TITLE,0);
SDrawPostClose();
}
}
// PROCESS EACH PLAYER'S ORDERS
for (DWORD player = 0; player < players; ++player)
if (data[player] && databytes[player])
switch (*data[player]) {
case ORDER_START:
started = 1;
break;
case ORDER_MOVE:
orderpos[player].x = *(data[player]+1);
orderpos[player].y = *(data[player]+2);
break;
case ORDER_QUIT:
SDrawPostClose();
break;
}
return insync;
}
//===========================================================================
BOOL UpdateScrollVelocity () {
// DETERMINE THE SCROLL DIRECTION
POINT pos;
GetCursorPos(&pos);
int x = (pos.x == 639) ? 1 : pos.x ? 0 : -1;
int y = (pos.y == 479) ? 1 : pos.y ? 0 : -1;
int velx = (scrollvel.x > 0) ? 1 : scrollvel.x ? -1 : 0;
int vely = (scrollvel.y > 0) ? 1 : scrollvel.y ? -1 : 0;
// UPDATE THE X VELOCITY
if (x) {
if ((velx != x) || (abs(scrollvel.x) < 24))
scrollvel.x += (abs(scrollvel.x) > 12) ? 2*x : x;
}
else if (velx)
scrollvel.x -= velx;
// UPDATE THE Y VELOCITY
if (y) {
if ((vely != y) || (abs(scrollvel.y) < 16))
scrollvel.y += (abs(scrollvel.y) > 8) ? 2*y : y;
}
else if (vely)
scrollvel.y -= vely;
return (scrollvel.x || scrollvel.y);
}
//===========================================================================
int APIENTRY WinMain (HINSTANCE instance, HINSTANCE, LPSTR, int) {
if (!Initialize(instance)) {
Destroy();
return 1;
}
return SMsgDoMessageLoop(IdleProc);
}
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