From 7a4984304721eb91ca5c3349871be1cab228451d Mon Sep 17 00:00:00 2001
From: Paul Gilbert
Date: Sat, 6 Dec 2008 02:07:30 +0000
Subject: Beginning of support for DW1 Demo - Interpret has been changed to
 support opcode differences, and CallLibraryRoutine has a new mapping list of
 routines

svn-id: r35252
---
 engines/tinsel/detection.cpp |  3 ---
 engines/tinsel/pcode.cpp     | 20 ++++++++++++++++----
 engines/tinsel/tinlib.cpp    | 23 +++++++++++++++++++++--
 engines/tinsel/tinsel.h      |  1 +
 4 files changed, 38 insertions(+), 9 deletions(-)

(limited to 'engines/tinsel')

diff --git a/engines/tinsel/detection.cpp b/engines/tinsel/detection.cpp
index c60a430ee7..5ccb94ce59 100644
--- a/engines/tinsel/detection.cpp
+++ b/engines/tinsel/detection.cpp
@@ -250,8 +250,6 @@ static const TinselGameDescription gameDescriptions[] = {
 	},
 #endif
 
-// Currently disabled since it isn't really supported
-#if 0
 	{	// Demo from http://www.adventure-treff.de/specials/dl_demos.php
 		{
 			"dw",
@@ -267,7 +265,6 @@ static const TinselGameDescription gameDescriptions[] = {
 		GF_DEMO,
 		TINSEL_V0,
 	},
-#endif
 
 	{	// German CD re-release "Neon Edition"
 		// Note: This release has ENGLISH.TXT (with german content) instead of GERMAN.TXT
diff --git a/engines/tinsel/pcode.cpp b/engines/tinsel/pcode.cpp
index 815ce2cd2f..c92a366403 100644
--- a/engines/tinsel/pcode.cpp
+++ b/engines/tinsel/pcode.cpp
@@ -403,7 +403,11 @@ void SaveInterpretContexts(INT_CONTEXT *sICInfo) {
  */
 static int32 Fetch(byte opcode, byte *code, int &ip) {
 	int32 tmp;
-	if (opcode & OPSIZE8) {
+	if (TinselV0) {
+		// Fetch a 32 bit value.
+		tmp = (int32)READ_LE_UINT32(code + ip);
+		ip += 4;
+	} else if (opcode & OPSIZE8) {
 		// Fetch and sign extend a 8 bit value to 32 bits.
 		tmp = *(int8 *)(code + ip);
 		ip += 1;
@@ -427,7 +431,13 @@ void Interpret(CORO_PARAM, INT_CONTEXT *ic) {
 		int tmp, tmp2;
 		int ip = ic->ip;
 		byte opcode = ic->code[ip++];
-		debug(7, "  Opcode %d (-> %d)", opcode, opcode & OPMASK);
+		if (TinselV0) {
+			ip += 3;	// DW1 demo opcodes are 4 bytes long
+			if ((opcode & OPMASK) > OP_IMM)
+				opcode += 3;
+		}
+
+		debug(7, "ip=%d  Opcode %d (-> %d)", ic->ip, opcode, opcode & OPMASK);
 		switch (opcode & OPMASK) {
 		case OP_HALT:			// end of program
 
@@ -483,6 +493,7 @@ void Interpret(CORO_PARAM, INT_CONTEXT *ic) {
 		case OP_CALL:				// procedure call
 
 			tmp = Fetch(opcode, ic->code, ip);
+			if (TinselV0) tmp *= 4;
 			//assert(0 <= tmp && tmp < codeSize);	// TODO: Verify jumps are not out of bounds
 			ic->stack[ic->sp + 1] = 0;	// static link
 			ic->stack[ic->sp + 2] = ic->bp;	// dynamic link
@@ -516,7 +527,8 @@ void Interpret(CORO_PARAM, INT_CONTEXT *ic) {
 			tmp2 = CallLibraryRoutine(coroParam, tmp, &ic->stack[ic->sp], ic, &ic->resumeState);
 			if (coroParam)
 				return;
-			ic->sp += tmp2;
+			if (!TinselV0)
+				ic->sp += tmp2;
 			LockCode(ic);
 			if (TinselV2 && (ic->resumeState == RES_1))
 				ic->resumeState = RES_NOT;
@@ -531,7 +543,7 @@ void Interpret(CORO_PARAM, INT_CONTEXT *ic) {
 
 		case OP_ALLOC:			// allocate storage on stack
 
-			ic->sp += Fetch(opcode, ic->code, ip);
+			ic->sp += (int32)Fetch(opcode, ic->code, ip);
 			break;
 
 		case OP_JUMP:	// unconditional jump
diff --git a/engines/tinsel/tinlib.cpp b/engines/tinsel/tinlib.cpp
index 2313f343e8..b9e8972b69 100644
--- a/engines/tinsel/tinlib.cpp
+++ b/engines/tinsel/tinlib.cpp
@@ -177,6 +177,20 @@ enum MASTER_LIB_CODES {
 	HIGHEST_LIBCODE
 };
 
+const MASTER_LIB_CODES DW1DEMO_CODES[] = {
+	ACTORREF, ACTORXPOS, ACTORYPOS, ADDTOPIC, ADDINV1, ADDINV2, AUXSCALE, BACKGROUND,
+	CAMERA, CONTROL, CONVERSATION, CONVTOPIC, HIGHEST_LIBCODE, CURSORXPOS, CURSORYPOS,
+	DECCONVW, DECCURSOR, DECFLAGS, DECINVW, DECINV1, DECINV2, DECLEAD, DELICON,
+	DELINV, EVENT, HIGHEST_LIBCODE, HELDOBJECT, HIDEACTOR, ININVENTORY, HIGHEST_LIBCODE,
+	INVENTORY, HIGHEST_LIBCODE, KILLACTOR, KILLBLOCK, KILLTAG, SCREENXPOS,
+	HIGHEST_LIBCODE, MOVECURSOR, NEWSCENE, NOSCROLL, OBJECTHELD, OFFSET, HIGHEST_LIBCODE,
+	PLAY, PLAYSAMPLE, PREPARESCENE, PRINT, PRINTOBJ, PRINTTAG, RESTORESCENE, SAVESCENE,
+	SCANICON, SCROLL, SETACTOR, SETBLOCK, HIGHEST_LIBCODE, SETTAG, SETTIMER, SHOWPOS,
+	SPLAY, STAND, STANDTAG, STOPWALK, HIGHEST_LIBCODE, SWALK, TAGACTOR, TALK,
+	SCREENYPOS, UNTAGACTOR, VIBRATE, WAITFRAME, WAITTIME, WALK, WALKINGACTOR, WALKPOLY,
+	WALKTAG, RANDOM, TIMER
+};
+
 const MASTER_LIB_CODES DW1_CODES[] = {
 	ACTORATTR, ACTORDIRECTION, ACTORREF, ACTORSCALE, ACTORXPOS,
 	ACTORYPOS, ADDTOPIC, ADDINV1, ADDINV2, ADDOPENINV, AUXSCALE,
@@ -4170,7 +4184,10 @@ int WhichInventory(void) {
  * @param pp				Top of parameter stack
  */
 int CallLibraryRoutine(CORO_PARAM, int operand, int32 *pp, const INT_CONTEXT *pic, RESUME_STATE *pResumeState) {
-	int libCode = TinselV2 ? DW2_CODES[operand] : DW1_CODES[operand];
+	int libCode;
+	if (TinselV0) libCode = DW1DEMO_CODES[operand];
+	else if (!TinselV2) libCode = DW1_CODES[operand];
+	else libCode = DW2_CODES[operand];
 
 	debug(7, "CallLibraryRoutine op %d (escOn %d, myEscape %d)", operand, pic->escOn, pic->myEscape);
 	switch (libCode) {
@@ -4205,7 +4222,9 @@ int CallLibraryRoutine(CORO_PARAM, int operand, int32 *pp, const INT_CONTEXT *pi
 
 	case ACTORREF:
 		// Common to both DW1 & DW2
-		error("actorref isn't a real function!");
+		if (!TinselV0)
+			error("actorref isn't a real function!");
+		return 0;
 
 	case ACTORRGB:
 		// DW2 only
diff --git a/engines/tinsel/tinsel.h b/engines/tinsel/tinsel.h
index 9cb8126567..8e15755d4e 100644
--- a/engines/tinsel/tinsel.h
+++ b/engines/tinsel/tinsel.h
@@ -119,6 +119,7 @@ typedef bool (*KEYFPTR)(const Common::KeyState &);
 #define GAME_FRAME_DELAY (1000 / ONE_SECOND)
 
 #define TinselVersion (_vm->getVersion())
+#define TinselV0 (TinselVersion == TINSEL_V0)
 #define TinselV2 (TinselVersion == TINSEL_V2)
 
 class TinselEngine : public Engine {
-- 
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