From 32f73fd34cfbae2c80ab2d502617a45511f486f2 Mon Sep 17 00:00:00 2001
From: Filippos Karapetis
Date: Fri, 2 Jan 2009 13:59:34 +0000
Subject: Rewrote the SAGA script system to use an opcode table, like in other
 engines

svn-id: r35670
---
 engines/saga/sthread.cpp | 531 ++---------------------------------------------
 1 file changed, 13 insertions(+), 518 deletions(-)

(limited to 'engines/saga/sthread.cpp')

diff --git a/engines/saga/sthread.cpp b/engines/saga/sthread.cpp
index ab1c771cbc..9e015179d9 100644
--- a/engines/saga/sthread.cpp
+++ b/engines/saga/sthread.cpp
@@ -37,9 +37,6 @@
 
 namespace Saga {
 
-#define RID_SCENE1_VOICE_START 57
-#define RID_SCENE1_VOICE_END 186
-
 ScriptThread *Script::createThread(uint16 scriptModuleNumber, uint16 scriptEntryPointNumber) {
 	ScriptThread *newThread;
 
@@ -165,7 +162,7 @@ void Script::executeThreads(uint msec) {
 		}
 
 		if (!(thread->_flags & kTFlagWaiting)) {
-			if (runThread(thread, STHREAD_TIMESLICE)) {
+			if (runThread(thread)) {
 				break;
 			}
 		}
@@ -196,535 +193,30 @@ void Script::completeThread(void) {
 		executeThreads(0);
 }
 
-bool Script::runThread(ScriptThread *thread, uint instructionLimit) {
-	const char*operandName;
-	uint instructionCount;
+bool Script::runThread(ScriptThread *thread) {
 	uint16 savedInstructionOffset;
-
-	byte *addr;
-	byte mode;
-	uint16 jmpOffset1;
-	int16 iparam1;
-	int16 iparam2;
-	int16 iparam3;
-
-	bool disContinue;
-	byte argumentsCount;
-	uint16 functionNumber;
-	uint16 checkStackTopIndex;
-	ScriptFunctionType scriptFunction;
-
+	bool stopParsing = false;
+	bool breakOut = false;
 	int operandChar;
-	int i;
 
 	MemoryReadStream scriptS(thread->_moduleBase, thread->_moduleBaseSize);
 
 	scriptS.seek(thread->_instructionOffset);
 
-	for (instructionCount = 0; instructionCount < instructionLimit; instructionCount++) {
+	for (uint instructionCount = 0; instructionCount < STHREAD_TIMESLICE; instructionCount++) {
 		if (thread->_flags & (kTFlagAsleep))
 			break;
 
 		savedInstructionOffset = thread->_instructionOffset;
 		operandChar = scriptS.readByte();
 
-
-#define CASEOP(opName)	case opName:												\
-							if (operandChar == opName) {							\
-								operandName = #opName;								\
-								debug(2, "%s", operandName);						\
-							}
-
 		debug(8, "Executing thread offset: %u (%x) stack: %d", thread->_instructionOffset, operandChar, thread->pushedSize());
-		operandName="";
-		switch (operandChar) {
-		CASEOP(opNextBlock)
-			// Some sort of "jump to the start of the next memory
-			// page" instruction, I think.
-			thread->_instructionOffset = (((thread->_instructionOffset) >> 10) + 1) << 10;
-			break;
-
-// STACK INSTRUCTIONS
-		CASEOP(opDup)
-			thread->push(thread->stackTop());
-			break;
-		CASEOP(opDrop)
-			thread->pop();
-			break;
-		CASEOP(opZero)
-			thread->push(0);
-			break;
-		CASEOP(opOne)
-			thread->push(1);
-			break;
-		CASEOP(opConstint)
-		CASEOP(opStrlit)
-			iparam1 = scriptS.readSint16LE();
-			thread->push(iparam1);
-			debug(8, "0x%X", iparam1);
-			break;
-
-// DATA INSTRUCTIONS
-		CASEOP(opGetFlag)
-			addr = thread->baseAddress(scriptS.readByte());
-			iparam1 = scriptS.readSint16LE();
-			addr += (iparam1 >> 3);
-			iparam1 = (1 << (iparam1 & 7));
-			thread->push((*addr) & iparam1 ? 1 : 0);
-			break;
-		CASEOP(opGetInt)
-			mode = scriptS.readByte();
-			addr = thread->baseAddress(mode);
-			iparam1 = scriptS.readSint16LE();
-			addr += iparam1;
-			thread->push(readUint16(addr, mode));
-			debug(8, "0x%X", readUint16(addr, mode));
-			break;
-		CASEOP(opPutFlag)
-			addr = thread->baseAddress(scriptS.readByte());
-			iparam1 = scriptS.readSint16LE();
-			addr += (iparam1 >> 3);
-			iparam1 = (1 << (iparam1 & 7));
-			if (thread->stackTop()) {
-				*addr |= iparam1;
-			} else {
-				*addr &= ~iparam1;
-			}
-			break;
-		CASEOP(opPutInt)
-			mode = scriptS.readByte();
-			addr = thread->baseAddress(mode);
-			iparam1 = scriptS.readSint16LE();
-			addr += iparam1;
-			writeUint16(addr, thread->stackTop(), mode);
-			break;
-		CASEOP(opPutFlagV)
-			addr = thread->baseAddress(scriptS.readByte());
-			iparam1 = scriptS.readSint16LE();
-			addr += (iparam1 >> 3);
-			iparam1 = (1 << (iparam1 & 7));
-			if (thread->pop()) {
-				*addr |= iparam1;
-			} else {
-				*addr &= ~iparam1;
-			}
-			break;
-		CASEOP(opPutIntV)
-			mode = scriptS.readByte();
-			addr = thread->baseAddress(mode);
-			iparam1 = scriptS.readSint16LE();
-			addr += iparam1;
-			writeUint16(addr, thread->pop(), mode);
-			break;
-
-// FUNCTION CALL INSTRUCTIONS
-		CASEOP(opCall)
-			argumentsCount = scriptS.readByte();
-			iparam1 = scriptS.readByte();
-			if (iparam1 != kAddressModule) {
-				error("Script::runThread iparam1 != kAddressModule");
-			}
-			addr = thread->baseAddress(iparam1);
-			iparam1 = scriptS.readSint16LE();
-			addr += iparam1;
-			thread->push(argumentsCount);
-
-			jmpOffset1 = scriptS.pos();
-			// NOTE: The original pushes the program
-			// counter as a pointer here. But I don't think
-			// we will have to do that.
-			thread->push(jmpOffset1);
-			// NOTE2: program counter is 32bit - so we should "emulate" it size - because kAddressStack relies on it
-			thread->push(0);
-			thread->_instructionOffset = iparam1;
-
-			break;
-		CASEOP(opCcall)
-		CASEOP(opCcallV)
-			argumentsCount = scriptS.readByte();
-			functionNumber = scriptS.readUint16LE();
-			if (functionNumber >= ((_vm->getGameId() == GID_IHNM) ?
-								   IHNM_SCRIPT_FUNCTION_MAX : ITE_SCRIPT_FUNCTION_MAX)) {
-				error("Script::runThread() Invalid script function number (%d)", functionNumber);
-			}
-
-			debug(2, "Calling #%d %s argCount=%i", functionNumber, _scriptFunctionsList[functionNumber].scriptFunctionName, argumentsCount);
-			scriptFunction = _scriptFunctionsList[functionNumber].scriptFunction;
-			checkStackTopIndex = thread->_stackTopIndex + argumentsCount;
-			disContinue = false;
-			(this->*scriptFunction)(thread, argumentsCount, disContinue);
-			if (disContinue) {
-				return true;
-			}
-			if (scriptFunction == &Saga::Script::sfScriptGotoScene ||
-				scriptFunction == &Saga::Script::sfVsetTrack) {
-				return true; // cause abortAllThreads called and _this_ thread destroyed
-			}
 
-			thread->_stackTopIndex = checkStackTopIndex;
-
-			if (operandChar == opCcall) {// CALL function
-				thread->push(thread->_returnValue);
-			}
-
-			if (thread->_flags & kTFlagAsleep)
-				instructionCount = instructionLimit;	// break out of loop!
-			break;
-		CASEOP(opEnter)
-			thread->push(thread->_frameIndex);
-			thread->_frameIndex = thread->_stackTopIndex;
-			thread->_stackTopIndex -= (scriptS.readSint16LE() / 2);
-			break;
-		CASEOP(opReturn)
-			thread->_returnValue = thread->pop();
-		CASEOP(opReturnV)
-			thread->_stackTopIndex = thread->_frameIndex;
-			thread->_frameIndex = thread->pop();
-			if (thread->pushedSize() == 0) {
-				thread->_flags |= kTFlagFinished;
-				return true;
-			} else {
-				thread->pop(); //cause it 0
-				thread->_instructionOffset = thread->pop();
-
-				// Pop all the call parameters off the stack
-				iparam1 = thread->pop();
-				while (iparam1--) {
-					thread->pop();
-				}
-
-				if (operandChar == opReturn) {
-					thread->push(thread->_returnValue);
-				}
-			}
-			break;
-
-// BRANCH INSTRUCTIONS
-		CASEOP(opJmp)
-			jmpOffset1 = scriptS.readUint16LE();
-			thread->_instructionOffset = jmpOffset1;
-			break;
-		CASEOP(opJmpTrueV)
-			jmpOffset1 = scriptS.readUint16LE();
-			if (thread->pop()) {
-				thread->_instructionOffset = jmpOffset1;
-			}
-			break;
-		CASEOP(opJmpFalseV)
-			jmpOffset1 = scriptS.readUint16LE();
-			if (!thread->pop()) {
-				thread->_instructionOffset = jmpOffset1;
-			}
-			break;
-		CASEOP(opJmpTrue)
-			jmpOffset1 = scriptS.readUint16LE();
-			if (thread->stackTop()) {
-				thread->_instructionOffset = jmpOffset1;
-			}
-			break;
-		CASEOP(opJmpFalse)
-			jmpOffset1 = scriptS.readUint16LE();
-			if (!thread->stackTop()) {
-				thread->_instructionOffset = jmpOffset1;
-			}
-			break;
-		CASEOP(opJmpSwitch)
-			iparam1 = scriptS.readSint16LE();
-			iparam2 = thread->pop();
-			while (iparam1--) {
-				iparam3 = scriptS.readUint16LE();
-				thread->_instructionOffset = scriptS.readUint16LE();
-				if (iparam3 == iparam2) {
-					break;
-				}
-			}
-			if (iparam1 < 0) {
-				thread->_instructionOffset = scriptS.readUint16LE();
-			}
-			break;
-		CASEOP(opJmpRandom)
-			// Supposedly the number of possible branches.
-			// The original interpreter ignores it.
-			scriptS.readUint16LE();
-			iparam1 = scriptS.readSint16LE();
-			iparam1 = _vm->_rnd.getRandomNumber(iparam1 - 1);
-			while (1) {
-				iparam2 = scriptS.readSint16LE();
-				thread->_instructionOffset = scriptS.readUint16LE();
-
-				iparam1 -= iparam2;
-				if (iparam1 < 0) {
-					break;
-				}
-			}
-			break;
-
-// UNARY INSTRUCTIONS
-		CASEOP(opNegate)
-			thread->push(-thread->pop());
-			break;
-		CASEOP(opNot)
-			thread->push(!thread->pop());
-			break;
-		CASEOP(opCompl)
-			thread->push(~thread->pop());
-			break;
-
-		CASEOP(opIncV)
-			mode = scriptS.readByte();
-			addr = thread->baseAddress(mode);
-			iparam1 = scriptS.readSint16LE();
-			addr += iparam1;
-			iparam1 = readUint16(addr, mode);
-			writeUint16(addr, iparam1 + 1, mode);
-			break;
-		CASEOP(opDecV)
-			mode = scriptS.readByte();
-			addr = thread->baseAddress(mode);
-			iparam1 = scriptS.readSint16LE();
-			addr += iparam1;
-			iparam1 = readUint16(addr, mode);
-			writeUint16(addr, iparam1 - 1, mode);
-			break;
-		CASEOP(opPostInc)
-			mode = scriptS.readByte();
-			addr = thread->baseAddress(mode);
-			iparam1 = scriptS.readSint16LE();
-			addr += iparam1;
-			iparam1 = readUint16(addr, mode);
-			thread->push(iparam1);
-			writeUint16(addr, iparam1 + 1, mode);
-			break;
-		CASEOP(opPostDec)
-			mode = scriptS.readByte();
-			addr = thread->baseAddress(mode);
-			iparam1 = scriptS.readSint16LE();
-			addr += iparam1;
-			iparam1 = readUint16(addr, mode);
-			thread->push(iparam1);
-			writeUint16(addr, iparam1 - 1, mode);
-			break;
-
-// ARITHMETIC INSTRUCTIONS
-		CASEOP(opAdd)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			iparam1 += iparam2;
-			thread->push(iparam1);
-			break;
-		CASEOP(opSub)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			iparam1 -= iparam2;
-			thread->push(iparam1);
-			break;
-		CASEOP(opMul)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			iparam1 *= iparam2;
-			thread->push(iparam1);
-			break;
-		CASEOP(opDiv)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			iparam1 /= iparam2;
-			thread->push(iparam1);
-			break;
-		CASEOP(opMod)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			iparam1 %= iparam2;
-			thread->push(iparam1);
-			break;
-
-// COMPARISION INSTRUCTIONS
-		CASEOP(opEq)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			thread->push((iparam1 == iparam2) ? 1 : 0);
-			debug(8, "0x%X 0x%X", iparam1, iparam2);
-			break;
-		CASEOP(opNe)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			thread->push((iparam1 != iparam2) ? 1 : 0);
-			break;
-		CASEOP(opGt)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			thread->push((iparam1 > iparam2) ? 1 : 0);
-			break;
-		CASEOP(opLt)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			thread->push((iparam1 < iparam2) ? 1 : 0);
-			break;
-		CASEOP(opGe)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			thread->push((iparam1 >= iparam2) ? 1 : 0);
-			break;
-		CASEOP(opLe)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			thread->push((iparam1 <= iparam2) ? 1 : 0);
-			break;
-
-// SHIFT INSTRUCTIONS
-		CASEOP(opRsh)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			iparam1 >>= iparam2;
-			thread->push(iparam1);
-			break;
-		CASEOP(opLsh)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			iparam1 <<= iparam2;
-			thread->push(iparam1);
-			break;
-
-// BITWISE INSTRUCTIONS
-		CASEOP(opAnd)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			iparam1 &= iparam2;
-			thread->push(iparam1);
-			break;
-		CASEOP(opOr)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			iparam1 |= iparam2;
-			thread->push(iparam1);
-			break;
-		CASEOP(opXor)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			iparam1 ^= iparam2;
-			thread->push(iparam1);
-			break;
-
-// LOGICAL INSTRUCTIONS
-		CASEOP(opLAnd)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			thread->push((iparam1 && iparam2) ? 1 : 0);
-			break;
-		CASEOP(opLOr)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			thread->push((iparam1 || iparam2) ? 1 : 0);
-			break;
-		CASEOP(opLXor)
-			iparam2 = thread->pop();
-			iparam1 = thread->pop();
-			thread->push(((iparam1 && !iparam2) || (!iparam1 && iparam2)) ? 1 : 0);
-			break;
-
-// GAME INSTRUCTIONS
-		CASEOP(opSpeak) {
-				int stringsCount;
-				uint16 actorId;
-				uint16 speechFlags;
-				int sampleResourceId = -1;
-				int16 first;
-				const char *strings[ACTOR_SPEECH_STRING_MAX];
-
-				if (_vm->_actor->isSpeaking()) {
-					thread->wait(kWaitTypeSpeech);
-					return false;
-				}
-
-				stringsCount = scriptS.readByte();
-				actorId = scriptS.readUint16LE();
-				speechFlags = scriptS.readByte();
-				scriptS.readUint16LE(); // x,y skip
-
-				if (stringsCount == 0)
-					error("opSpeak stringsCount == 0");
-
-				if (stringsCount > ACTOR_SPEECH_STRING_MAX)
-					error("opSpeak stringsCount=0x%X exceed ACTOR_SPEECH_STRING_MAX", stringsCount);
-
-				iparam1 = first = thread->stackTop();
-				for (i = 0; i < stringsCount; i++) {
-					 iparam1 = thread->pop();
-					 strings[i] = thread->_strings->getString(iparam1);
-				}
-				// now data contains last string index
-
-				if (_vm->getFeatures() & GF_OLD_ITE_DOS) { // special ITE dos
-					if ((_vm->_scene->currentSceneNumber() == ITE_DEFAULT_SCENE) &&
-						(iparam1 >= 288) && (iparam1 <= (RID_SCENE1_VOICE_END - RID_SCENE1_VOICE_START + 288))) {
-						sampleResourceId = RID_SCENE1_VOICE_START + iparam1 - 288;
-					}
-				} else {
-					if (thread->_voiceLUT->voicesCount > first) {
-						sampleResourceId = thread->_voiceLUT->voices[first];
-					}
-				}
-
-				if (sampleResourceId < 0 || sampleResourceId > 4000)
-					sampleResourceId = -1;
-
-				if (_vm->getGameId() == GID_ITE && !sampleResourceId)
-					sampleResourceId = -1;
-
-				_vm->_actor->actorSpeech(actorId, strings, stringsCount, sampleResourceId, speechFlags);
-
-				if (!(speechFlags & kSpeakAsync)) {
-					thread->wait(kWaitTypeSpeech);
-				}
-			}
-			break;
-		CASEOP(opDialogBegin)
-			if (_conversingThread) {
-				thread->wait(kWaitTypeDialogBegin);
-				return false;
-			}
-			_conversingThread = thread;
-			_vm->_interface->converseClear();
-			break;
-		CASEOP(opDialogEnd)
-			if (thread == _conversingThread) {
-				_vm->_interface->activate();
-				_vm->_interface->setMode(kPanelConverse);
-				thread->wait(kWaitTypeDialogEnd);
-				return false;
-			}
-			break;
-		CASEOP(opReply) {
-				const char *str;
-				byte replyNum;
-				byte flags;
-				replyNum = scriptS.readByte();
-				flags = scriptS.readByte();
-				iparam1 = 0;
-				int strID = thread->pop();
-
-				if (flags & kReplyOnce) {
-					iparam1 = scriptS.readSint16LE();
-					addr = thread->_staticBase + (iparam1 >> 3);
-					if (*addr & (1 << (iparam1 & 7))) {
-						break;
-					}
-				}
-
-				str = thread->_strings->getString(strID);
-				if (_vm->_interface->converseAddText(str, strID, replyNum, flags, iparam1))
-					warning("Error adding ConverseText (%s, %d, %d, %d)", str, replyNum, flags, iparam1);
-			}
-			break;
-		CASEOP(opAnimate)
-			scriptS.readUint16LE();
-			scriptS.readUint16LE();
-			jmpOffset1 = scriptS.readByte();
-			thread->_instructionOffset += jmpOffset1;
-			break;
-
-		default:
-			error("Script::runThread() Invalid opcode encountered 0x%X", operandChar);
-		}
+		stopParsing = false;
+		(this->*_scriptOpsList[operandChar].scriptOp)(thread, &scriptS, stopParsing, breakOut);
+		debug(4, "Calling op %s", this->_scriptOpsList[operandChar].scriptOpName);
+		if (stopParsing)
+			return true;
 
 		if (thread->_flags & (kTFlagFinished | kTFlagAborted)) {
 			error("Wrong flags %d in thread", thread->_flags);
@@ -740,6 +232,9 @@ bool Script::runThread(ScriptThread *thread, uint instructionLimit) {
 
 			scriptS.seek(thread->_instructionOffset);
 		}
+
+		if (breakOut)
+			break;
 	}
 	return false;
 }
-- 
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