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4c3a68027f
it's Logic::_scriptVars[ID] instead of just ID. Apart from looking cool, it makes it much easier to tell the difference between variables and constants when looking at the code. Of course, this sort of sweeping changes is jolly good for introducing truly weird regressions, which is why I waited until after 0.6.0. svn-id: r13331
633 lines
16 KiB
C++
633 lines
16 KiB
C++
/* Copyright (C) 1994-2004 Revolution Software Ltd
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*/
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#include "common/stdafx.h"
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#include "common/util.h"
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#include "sword2/sword2.h"
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#include "sword2/interpreter.h"
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#include "sword2/logic.h"
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namespace Sword2 {
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#define STACK_SIZE 10
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// The machine code table
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#define OPCODE(x) { &Logic::x, #x }
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typedef int32 (Logic::*OpcodeProc)(int32 *);
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struct OpcodeEntry {
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OpcodeProc proc;
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const char *desc;
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};
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static const OpcodeEntry opcodes[] = {
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/* 00 */
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OPCODE(fnTestFunction),
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OPCODE(fnTestFlags),
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OPCODE(fnRegisterStartPoint),
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OPCODE(fnInitBackground),
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/* 04 */
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OPCODE(fnSetSession),
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OPCODE(fnBackSprite),
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OPCODE(fnSortSprite),
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OPCODE(fnForeSprite),
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/* 08 */
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OPCODE(fnRegisterMouse),
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OPCODE(fnAnim),
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OPCODE(fnRandom),
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OPCODE(fnPreLoad),
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/* 0C */
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OPCODE(fnAddSubject),
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OPCODE(fnInteract),
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OPCODE(fnChoose),
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OPCODE(fnWalk),
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/* 10 */
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OPCODE(fnWalkToAnim),
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OPCODE(fnTurn),
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OPCODE(fnStandAt),
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OPCODE(fnStand),
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/* 14 */
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OPCODE(fnStandAfterAnim),
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OPCODE(fnPause),
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OPCODE(fnMegaTableAnim),
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OPCODE(fnAddMenuObject),
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/* 18 */
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OPCODE(fnStartConversation),
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OPCODE(fnEndConversation),
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OPCODE(fnSetFrame),
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OPCODE(fnRandomPause),
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/* 1C */
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OPCODE(fnRegisterFrame),
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OPCODE(fnNoSprite),
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OPCODE(fnSendSync),
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OPCODE(fnUpdatePlayerStats),
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/* 20 */
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OPCODE(fnPassGraph),
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OPCODE(fnInitFloorMouse),
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OPCODE(fnPassMega),
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OPCODE(fnFaceXY),
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/* 24 */
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OPCODE(fnEndSession),
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OPCODE(fnNoHuman),
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OPCODE(fnAddHuman),
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OPCODE(fnWeWait),
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/* 28 */
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OPCODE(fnTheyDoWeWait),
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OPCODE(fnTheyDo),
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OPCODE(fnWalkToTalkToMega),
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OPCODE(fnFadeDown),
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/* 2C */
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OPCODE(fnISpeak),
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OPCODE(fnTotalRestart),
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OPCODE(fnSetWalkGrid),
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OPCODE(fnSpeechProcess),
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/* 30 */
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OPCODE(fnSetScaling),
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OPCODE(fnStartEvent),
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OPCODE(fnCheckEventWaiting),
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OPCODE(fnRequestSpeech),
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/* 34 */
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OPCODE(fnGosub),
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OPCODE(fnTimedWait),
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OPCODE(fnPlayFx),
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OPCODE(fnStopFx),
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/* 38 */
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OPCODE(fnPlayMusic),
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OPCODE(fnStopMusic),
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OPCODE(fnSetValue),
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OPCODE(fnNewScript),
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/* 3C */
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OPCODE(fnGetSync),
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OPCODE(fnWaitSync),
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OPCODE(fnRegisterWalkGrid),
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OPCODE(fnReverseMegaTableAnim),
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/* 40 */
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OPCODE(fnReverseAnim),
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OPCODE(fnAddToKillList),
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OPCODE(fnSetStandbyCoords),
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OPCODE(fnBackPar0Sprite),
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/* 44 */
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OPCODE(fnBackPar1Sprite),
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OPCODE(fnForePar0Sprite),
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OPCODE(fnForePar1Sprite),
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OPCODE(fnSetPlayerActionEvent),
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/* 48 */
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OPCODE(fnSetScrollCoordinate),
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OPCODE(fnStandAtAnim),
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OPCODE(fnSetScrollLeftMouse),
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OPCODE(fnSetScrollRightMouse),
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/* 4C */
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OPCODE(fnColour),
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OPCODE(fnFlash),
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OPCODE(fnPreFetch),
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OPCODE(fnGetPlayerSaveData),
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/* 50 */
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OPCODE(fnPassPlayerSaveData),
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OPCODE(fnSendEvent),
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OPCODE(fnAddWalkGrid),
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OPCODE(fnRemoveWalkGrid),
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/* 54 */
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OPCODE(fnCheckForEvent),
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OPCODE(fnPauseForEvent),
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OPCODE(fnClearEvent),
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OPCODE(fnFaceMega),
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/* 58 */
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OPCODE(fnPlaySequence),
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OPCODE(fnShadedSprite),
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OPCODE(fnUnshadedSprite),
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OPCODE(fnFadeUp),
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/* 5C */
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OPCODE(fnDisplayMsg),
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OPCODE(fnSetObjectHeld),
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OPCODE(fnAddSequenceText),
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OPCODE(fnResetGlobals),
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/* 60 */
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OPCODE(fnSetPalette),
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OPCODE(fnRegisterPointerText),
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OPCODE(fnFetchWait),
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OPCODE(fnRelease),
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/* 64 */
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OPCODE(fnPrepareMusic),
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OPCODE(fnSoundFetch),
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OPCODE(fnPrepareMusic), // Again, apparently
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OPCODE(fnSmackerLeadIn),
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/* 68 */
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OPCODE(fnSmackerLeadOut),
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OPCODE(fnStopAllFx),
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OPCODE(fnCheckPlayerActivity),
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OPCODE(fnResetPlayerActivityDelay),
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/* 6C */
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OPCODE(fnCheckMusicPlaying),
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OPCODE(fnPlayCredits),
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OPCODE(fnSetScrollSpeedNormal),
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OPCODE(fnSetScrollSpeedSlow),
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/* 70 */
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OPCODE(fnRemoveChooser),
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OPCODE(fnSetFxVolAndPan),
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OPCODE(fnSetFxVol),
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OPCODE(fnRestoreGame),
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/* 74 */
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OPCODE(fnRefreshInventory),
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OPCODE(fnChangeShadows)
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};
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#define push(value) \
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do { \
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assert(stackPtr < ARRAYSIZE(stack)); \
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stack[stackPtr++] = (value); \
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} while (false)
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#define pop() (assert(stackPtr < ARRAYSIZE(stack)), stack[--stackPtr])
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uint32 *Logic::_scriptVars = NULL;
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int Logic::runScript(char *scriptData, char *objectData, uint32 *offset) {
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// Interestingly, unlike our BASS engine the stack is a local variable.
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// This has some interesting implications which may or may not be
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// necessary to the BS2 engine.
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int32 stack[STACK_SIZE];
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int32 stackPtr = 0;
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StandardHeader *header = (StandardHeader *) scriptData;
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scriptData += sizeof(StandardHeader) + sizeof(ObjectHub);
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// The script data format:
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// int32_TYPE 1 Size of variable space in bytes
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// ... The variable space
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// int32_TYPE 1 numberOfScripts
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// int32_TYPE numberOfScripts The offsets for each script
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// Initialise some stuff
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uint32 ip = 0; // Code pointer
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int scriptNumber;
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// Get the start of variables and start of code
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uint32 *variables = (uint32 *) (scriptData + sizeof(int32));
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const char *code = scriptData + (int32) READ_LE_UINT32(scriptData) + sizeof(int32);
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uint32 noScripts = (int32) READ_LE_UINT32(code);
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code += sizeof(int32);
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const uint32 *offsetTable = (const uint32 *) code;
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if (*offset < noScripts) {
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ip = FROM_LE_32(offsetTable[*offset]);
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scriptNumber = *offset;
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debug(4, "Start script %d with offset %d", *offset, ip);
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} else {
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uint i;
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ip = *offset;
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for (i = 1; i < noScripts; i++) {
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if (FROM_LE_32(offsetTable[i]) >= ip)
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break;
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}
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scriptNumber = i - 1;
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debug(4, "Resume script %d with offset %d", scriptNumber, ip);
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}
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// WORKAROUND: The dreaded pyramid makes the torch untakeable when you
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// speak to Titipoco. This is because one of the conditions for the
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// torch to be takeable is that Titipoco isn't doing anything out of
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// the ordinary. Global variable 913 has to be 0 to signify that he is
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// in his "idle" state.
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//
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// Unfortunately, simply the act of speaking to him sets variable 913
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// to 1 (probably to stop him from turning around every now and then).
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// The script may then go on to set the variable to different values
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// to trigger various behaviours in him, but if you have run out of
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// these cases the script won't ever set it back to 0 again.
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//
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// So if his click hander (action script number 2) finishes, and
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// variable 913 is 1, we set it back to 0 manually.
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bool checkPyramidBug = scriptNumber == 2 && strcmp((char *) header->name, "titipoco_81") == 0;
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code += noScripts * sizeof(int32);
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// Code should nop be pointing at an identifier and a checksum
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const int *checksumBlock = (const int *) code;
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code += sizeof(int32) * 3;
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if (READ_LE_UINT32(checksumBlock) != 12345678) {
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error("Invalid script in object %s", header->name);
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return 0;
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}
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int codeLen = READ_LE_UINT32(checksumBlock + 1);
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int checksum = 0;
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for (int i = 0; i < codeLen; i++)
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checksum += (unsigned char) code[i];
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if (checksum != (int32) READ_LE_UINT32(checksumBlock + 2)) {
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error("Checksum error in object %s", header->name);
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return 0;
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}
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bool runningScript = true;
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int parameterReturnedFromMcodeFunction = 0; // Allow scripts to return things
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int savedStartOfMcode = 0; // For saving start of mcode commands
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while (runningScript) {
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int32 a, b;
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int curCommand, parameter, value; // Command and parameter variables
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int retVal;
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int caseCount;
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bool foundCase;
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int32 ptrval;
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int i;
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curCommand = code[ip++];
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switch (curCommand) {
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// Script-related opcodes
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case CP_END_SCRIPT:
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// End the script
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debug(5, "End script");
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runningScript = false;
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// WORKAROUND: Pyramid Bug. See explanation above.
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if (checkPyramidBug && _scriptVars[913] == 1) {
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warning("Working around Titipoco script bug (the \"Pyramid Bug\")");
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_scriptVars[913] = 0;
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}
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break;
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case CP_QUIT:
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// Quit out for a cycle
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debug(5, "Quit script for a cycle");
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*offset = ip;
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return 0;
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case CP_TERMINATE:
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// Quit out immediately without affecting the offset
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// pointer
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debug(5, "Terminate script");
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return 3;
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case CP_RESTART_SCRIPT:
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// Start the script again
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debug(5, "Restart script");
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ip = FROM_LE_32(offsetTable[scriptNumber]);
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break;
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// Stack-related opcodes
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case CP_PUSH_INT32:
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// Push a long word value on to the stack
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Read32ip(parameter);
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debug(5, "Push int32 %d", parameter);
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push(parameter);
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break;
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case CP_PUSH_LOCAL_VAR32:
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// Push the contents of a local variable
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Read16ip(parameter);
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parameter /= 4;
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debug(5, "Push local var %d (%d)", parameter, variables[parameter]);
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push(variables[parameter]);
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break;
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case CP_PUSH_GLOBAL_VAR32:
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// Push a global variable
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Read16ip(parameter);
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assert(_scriptVars);
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debug(5, "Push global var %d (%d)", parameter, _scriptVars[parameter]);
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push(_scriptVars[parameter]);
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break;
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case CP_PUSH_LOCAL_ADDR:
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// push the address of a local variable
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Read16ip(parameter);
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parameter /= 4;
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ptrval = _vm->_memory->ptrToInt((const uint8 *) &variables[parameter]);
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debug(5, "Push address of local variable %d (%x)", parameter, ptrval);
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push(ptrval);
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break;
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case CP_PUSH_STRING:
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// Push the address of a string on to the stack
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// Get the string size
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Read8ip(parameter);
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// ip points to the string
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ptrval = _vm->_memory->ptrToInt((const uint8 *) (code + ip));
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debug(5, "Push address of string (%x)\n", ptrval);
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push(ptrval);
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ip += (parameter + 1);
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break;
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case CP_PUSH_DEREFERENCED_STRUCTURE:
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// Push the address of a dereferenced structure
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Read32ip(parameter);
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ptrval = _vm->_memory->ptrToInt((const uint8 *) (objectData + sizeof(int32) + sizeof(StandardHeader) + sizeof(ObjectHub) + parameter));
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debug(5, "Push address of far variable (%x)", ptrval);
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push(ptrval);
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break;
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case CP_POP_LOCAL_VAR32:
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// Pop a value into a local word variable
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Read16ip(parameter);
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parameter /= 4;
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value = pop();
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debug(5, "Pop %d into local var %d", value, parameter);
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variables[parameter] = value;
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break;
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case CP_POP_GLOBAL_VAR32:
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// Pop a global variable
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Read16ip(parameter);
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value = pop();
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debug(5, "Pop %d into global var %d", value, parameter);
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_scriptVars[parameter] = value;
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break;
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case CP_ADDNPOP_LOCAL_VAR32:
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Read16ip(parameter);
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parameter /= 4;
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value = pop();
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variables[parameter] += value;
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debug(5, "+= %d into local var %d -> %d", value, parameter, variables[parameter]);
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break;
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case CP_SUBNPOP_LOCAL_VAR32:
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Read16ip(parameter);
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parameter /= 4;
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value = pop();
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variables[parameter] -= value;
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debug(5, "-= %d into local var %d -> %d", value, parameter, variables[parameter]);
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break;
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case CP_ADDNPOP_GLOBAL_VAR32:
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// Add and pop a global variable
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Read16ip(parameter);
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value = pop();
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_scriptVars[parameter] += value;
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debug(5, "+= %d into global var %d -> %d", value, parameter, _scriptVars[parameter]);
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break;
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case CP_SUBNPOP_GLOBAL_VAR32:
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// Sub and pop a global variable
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Read16ip(parameter);
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value = pop();
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_scriptVars[parameter] -= value;
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debug(5, "-= %d into global var %d -> %d", value, parameter, _scriptVars[parameter]);
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break;
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// Jump opcodes
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case CP_SKIPONTRUE:
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// Skip if the value on the stack is true
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Read32ipLeaveip(parameter);
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value = pop();
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debug(5, "Skip %d if %d is false", parameter, value);
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if (!value)
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ip += sizeof(int32);
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else
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ip += parameter;
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break;
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case CP_SKIPONFALSE:
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// Skip if the value on the stack is false
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Read32ipLeaveip(parameter);
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value = pop();
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debug(5, "Skip %d if %d is false", parameter, value);
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if (value)
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ip += sizeof(int32);
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else
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ip += parameter;
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break;
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case CP_SKIPALWAYS:
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// skip a block
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Read32ipLeaveip(parameter);
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debug(5, "Skip %d", parameter);
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ip += parameter;
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break;
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case CP_SWITCH:
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// switch
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value = pop();
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Read32ip(caseCount);
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// Search the cases
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foundCase = false;
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for (i = 0; i < caseCount && !foundCase; i++) {
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if (value == (int32) READ_LE_UINT32(code + ip)) {
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// We have found the case, so lets
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// jump to it
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foundCase = true;
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ip += READ_LE_UINT32(code + ip + sizeof(int32));
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} else
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ip += sizeof(int32) * 2;
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}
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// If we found no matching case then use the default
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if (!foundCase)
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ip += READ_LE_UINT32(code + ip);
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break;
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case CP_SAVE_MCODE_START:
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// Save the start position on an mcode instruction in
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// case we need to restart it again
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savedStartOfMcode = ip - 1;
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break;
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case CP_CALL_MCODE:
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// Call an mcode routine
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Read16ip(parameter);
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assert(parameter < ARRAYSIZE(opcodes));
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// amount to adjust stack by (no of parameters)
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Read8ip(value);
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debug(5, "Calling '%s' with %d parameters", opcodes[parameter].desc, value);
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stackPtr -= value;
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assert(stackPtr >= 0);
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retVal = (this->*opcodes[parameter].proc)(&stack[stackPtr]);
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switch (retVal & 7) {
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case IR_STOP:
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// Quit out for a cycle
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*offset = ip;
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return 0;
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case IR_CONT:
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// Continue as normal
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break;
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case IR_TERMINATE:
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// Return without updating the offset
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return 2;
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case IR_REPEAT:
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// Return setting offset to start of this
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// function call
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*offset = savedStartOfMcode;
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return 0;
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case IR_GOSUB:
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// that's really neat
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*offset = ip;
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return 2;
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default:
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error("Bad return code (%d) from '%s'", opcodes[parameter].desc, retVal & 7);
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}
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parameterReturnedFromMcodeFunction = retVal >> 3;
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break;
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case CP_JUMP_ON_RETURNED:
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// Jump to a part of the script depending on
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// the return value from an mcode routine
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|
|
// Get the maximum value
|
|
Read8ip(parameter);
|
|
ip += READ_LE_UINT32(code + ip + parameterReturnedFromMcodeFunction * 4);
|
|
break;
|
|
|
|
// Operators
|
|
|
|
case OP_ISEQUAL:
|
|
b = pop();
|
|
a = pop();
|
|
push(a == b);
|
|
debug(5, "operation %d == %d", a, b);
|
|
break;
|
|
case OP_NOTEQUAL:
|
|
b = pop();
|
|
a = pop();
|
|
push(a != b);
|
|
debug(5, "operation %d != %d", a, b);
|
|
break;
|
|
case OP_GTTHAN:
|
|
b = pop();
|
|
a = pop();
|
|
push(a > b);
|
|
debug(5, "operation %d > %d", a, b);
|
|
break;
|
|
case OP_LSTHAN:
|
|
b = pop();
|
|
a = pop();
|
|
push(a < b);
|
|
debug(5, "operation %d < %d", a, b);
|
|
break;
|
|
case OP_GTTHANE:
|
|
b = pop();
|
|
a = pop();
|
|
push(a >= b);
|
|
debug(5, "operation %d >= %d", a, b);
|
|
break;
|
|
case OP_LSTHANE:
|
|
b = pop();
|
|
a = pop();
|
|
push(a <= b);
|
|
debug(5, "operation %d <= %d", a, b);
|
|
break;
|
|
case OP_PLUS:
|
|
b = pop();
|
|
a = pop();
|
|
push(a + b);
|
|
debug(5, "operation %d + %d", a, b);
|
|
break;
|
|
case OP_MINUS:
|
|
b = pop();
|
|
a = pop();
|
|
push(a - b);
|
|
debug(5, "operation %d - %d", a, b);
|
|
break;
|
|
case OP_TIMES:
|
|
b = pop();
|
|
a = pop();
|
|
push(a * b);
|
|
debug(5, "operation %d * %d", a, b);
|
|
break;
|
|
case OP_DIVIDE:
|
|
b = pop();
|
|
a = pop();
|
|
push(a / b);
|
|
debug(5, "operation %d / %d", a, b);
|
|
break;
|
|
case OP_ANDAND:
|
|
b = pop();
|
|
a = pop();
|
|
push(a && b);
|
|
debug(5, "operation %d && %d", a, b);
|
|
break;
|
|
case OP_OROR:
|
|
b = pop();
|
|
a = pop();
|
|
push(a || b);
|
|
debug(5, "operation %d || %d", a, b);
|
|
break;
|
|
|
|
// Debugging opcodes, I think
|
|
|
|
case CP_DEBUGON:
|
|
// Turn debugging on
|
|
_debugFlag = true;
|
|
break;
|
|
case CP_DEBUGOFF:
|
|
// Turn debugging on
|
|
_debugFlag = false;
|
|
break;
|
|
case CP_TEMP_TEXT_PROCESS:
|
|
// Process a text line
|
|
Read32ip(parameter);
|
|
debug(5, "Process text id %d", parameter);
|
|
break;
|
|
default:
|
|
error("Invalid script command %d", curCommand);
|
|
return 3;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
} // End of namespace Sword2
|