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/***************************************************************************** * * GameManager.cpp * * Electrical Engineering Faculty - Software Lab * Spring semester 1998 * * Tanks game * * Module description: The core of the game - implements the main game loop. * Holds the list of objects participating in the game. * In every game iteration, all the objects on the list * are refreshed, and the game display is updated. * More details on the algorithms in use are described below. * * Authors: Eran Yariv - 28484475 * Moshe Zur - 24070856 * * * Date: 23/09/98 * ******************************************************************************/ #include "stdafx.h" #include <afxmt.h> #include "tanks.h" #include "DIB.h" #include "GameManager.h" #include "ImageManager.h" #include "MsgQueue.h" #include "Bonus.h" #include "GameBoard.h" #include "TankObj.h" #include "Shell.h" #include "Bullet.h" #include "Mine.h" #include "Bomber.h" #include "Message.h" #include "GameOver.h" CGameManager::CGameManager (UINT uFreq) : m_Timer(TANKS_APP->m_gTimer), m_ImageManager(TANKS_APP->m_gImageManager), m_MsgQueue(TANKS_APP->m_gIncomingMsgQueue), m_CommManager(TANKS_APP->m_gCommManager), m_dwBonusTimeout (0) { VERIFY (SetFrequency (uFreq)); } BOOL CGameManager::SetFrequency (UINT uFreq) { if (uFreq < MIN_RENDER_FREQ || uFreq > MAX_RENDER_FREQ) return FALSE; m_uFreq = uFreq; m_uMilliSleep = UINT (double(1000.0) / double(m_uFreq)); return TRUE; } UINT CGameManager::ThreadEntry (LPVOID /*lpParam*/) { SetPriority (GAME_MANAGER_THREAD_PRIORITY); m_MapHWnd = TANKS_APP->m_gHwndMap; // Get handle to map (Windows handle) ASSERT (NULL != m_MapHWnd); m_dwChkSumSignal = 0; // Don't send check sum right away m_iNumTanks = 0; // Initially, no tanks. m_iLocalTankID = -1; // Initially, no local tank HDC dc = ::GetDC (m_MapHWnd); m_BackBuffer.CreateEmpty (MAP_WIDTH, MAP_HEIGHT);// Create back (off-screen) buffer m_BackBuffer.GetPaletteFromResourceBitmap (IDB_BULLET); TANKS_APP->m_gDrawDIB.SetPalette (*m_BackBuffer.m_pPalette); TANKS_APP->m_gDrawDIB.Realize (dc, FALSE); ::ReleaseDC (m_MapHWnd, dc); MultiRectGameTechnique (); // Do the game main loop DestroyObjects (); // Kill list of objects return 0; } void CGameManager::DestroyObjects () { m_GameObjsList.KillList(); m_TanksCS.Lock(); for (int i=0; i<MAX_TANKS; i++) m_pTanks[i] = NULL; m_TanksCS.Unlock(); m_BonusCS.Lock(); m_pBonus = NULL; m_BonusCS.Unlock(); m_iNumTanks = 0; } #pragma warning (disable : 4701) /* warning C4701: local variable 'CurObjHImg' may be used without having been initialized God damn it, trust me on this one - I know what I'm doing here.... */ /*------------------------------------------------------------------------------ Function: MultiRectGameTechnique Purpose: Main game loop. Every iteration of the loop, game objects recalc their status, and the display is refreshed. Every Iteration lasts a constant period of time, to allow a steady frame rate of the display, using the sleep system call, to stay low on CPU use. Input: None. Output: None. Remarks: The algorithm in use is explained in details in the Programmers's manual section in the game's help files. ------------------------------------------------------------------------------*/ void CGameManager::MultiRectGameTechnique () { #ifdef GATHER_RENDERING_STATS DWORD dwLoopCount=0; DWORD dwStartTime = GetTickCount(); int lTotalTimeLeft = 0, // For statistics only ! lMaxTimeLeft = 0, // For statistics only ! lMinTimeLeft = LONG(m_uMilliSleep), // For statistics only ! iMaxObjs = 0; // For statistics only ! #endif // GATHER_RENDERING_STATS BOOL bImageChanged; typedef struct { HIMAGE himg; CPoint ObjectPos; } UpdateArrayUnit; UpdateArrayUnit UpdateArray[MAX_POSSIBLE_OBJECTS]; UINT uArrIndex; LONG lSleepTime; // Time left to sleep (may be negative if loop is too slow) m_bRefreshAll = TRUE; // Initially, empty the message queue to add the board object to the game objects list EmptyMsgQ(dwStartTime); // First, create the constant board in the back-buffer LIST_POS lp = m_GameObjsList.GetHeadPosition(); CGameObject* pBoard = m_GameObjsList.GetNext(lp); ASSERT (pBoard->GetType() == BOARD); CDIB *pBoardDIB = m_ImageManager.ExposeDIB (pBoard->GetImage()); // Copy the board directly - no transparency m_BackBuffer.CopyFrom (pBoardDIB); while (!m_bEndThread) { // Loop while game lasts // Get sample time DWORD dwCurTime = m_Timer.GetLocalTime(); DWORD dwLoopStart = dwCurTime; AttemptToSendGameChecksum (); if (m_CommManager.IsHost()) TryToAddBonus (dwCurTime); // Empty object list requests queue bImageChanged = EmptyMsgQ(dwCurTime); // Init update rectangle m_UpdateRegionRect.SetRectEmpty(); // Init updates array uArrIndex = 0; // // First pass: loop the objects // // Walk over game objects and update rectangle // Skip the board: LIST_POS lp = m_GameObjsList.GetHeadPosition(); CGameObject* pGameObj = m_GameObjsList.GetNext(lp); ASSERT (pGameObj->GetType() == BOARD); // Loop the other (transparent non-board) objects: for ( pGameObj = m_GameObjsList.GetNext(lp); pGameObj; pGameObj = m_GameObjsList.GetNext(lp) ) { StateType CurObjState = pGameObj->CalcState(dwCurTime); HIMAGE CurObjHImg; // Get new position from current object CPoint CurObjPos = pGameObj->GetPos(); // Get update rectangle from current object CRect CurObjUpdateRect = pGameObj -> GetUpdateRectangle(); // Update region to be union of all rectangles m_UpdateRegionRect |= CurObjUpdateRect; if (STATE_DEAD == CurObjState) { // Object is no longer with us: BOOL fIsMine = FALSE; if (pGameObj->GetType() == MINE) { fIsMine = TRUE; } else if (pGameObj->GetType() == TA