From 6cab258032b72054f901d4a19a85ac6ef8ef4513 Mon Sep 17 00:00:00 2001
From: Bertrand Augereau
Date: Sat, 20 Aug 2011 12:26:10 +0200
Subject: DREAMWEB: Ported 'dochange' to C++

---
 engines/dreamweb/dreamgen.cpp | 43 ------------------------------------
 engines/dreamweb/dreamgen.h   |  3 +--
 engines/dreamweb/structs.h    | 25 ++++++++++++++++++---
 engines/dreamweb/stubs.cpp    | 51 ++++++++++++++++++++++++++++++-------------
 engines/dreamweb/stubs.h      |  6 ++++-
 5 files changed, 64 insertions(+), 64 deletions(-)

(limited to 'engines')

diff --git a/engines/dreamweb/dreamgen.cpp b/engines/dreamweb/dreamgen.cpp
index 541a938c19..0b3e57f11d 100644
--- a/engines/dreamweb/dreamgen.cpp
+++ b/engines/dreamweb/dreamgen.cpp
@@ -11338,48 +11338,6 @@ void DreamGenContext::switchryanoff() {
 	data.byte(kRyanon) = 1;
 }
 
-void DreamGenContext::dochange() {
-	STACK_CHECK;
-	_cmp(ch, 0);
-	if (flags.z())
-		goto object;
-	_cmp(ch, 1);
-	if (flags.z())
-		goto freeobject;
-	push(cx);
-	ah = 0;
-	_add(ax, ax);
-	_add(ax, ax);
-	_add(ax, ax);
-	push(ax);
-	al = ch;
-	_sub(al, 100);
-	ah = 0;
-	cx = 144;
-	_mul(cx);
-	bx = pop();
-	_add(bx, ax);
-	_add(bx, (0));
-	es = data.word(kReels);
-	cx = pop();
-	es.byte(bx+6) = cl;
-	return;
-object:
-	push(cx);
-	getsetad();
-	cx = pop();
-	es.byte(bx+58) = cl;
-	return;
-freeobject:
-	push(cx);
-	getfreead();
-	cx = pop();
-	_cmp(es.byte(bx+2), 255);
-	if (!flags.z())
-		return /* (beenpickedup) */;
-	es.byte(bx+2) = cl;
-}
-
 void DreamGenContext::autoappear() {
 	STACK_CHECK;
 	_cmp(data.byte(kLocation), 32);
@@ -18670,7 +18628,6 @@ void DreamGenContext::__dispatch_call(uint16 addr) {
 		case addr_removefreeobject: removefreeobject(); break;
 		case addr_switchryanon: switchryanon(); break;
 		case addr_switchryanoff: switchryanoff(); break;
-		case addr_dochange: dochange(); break;
 		case addr_autoappear: autoappear(); break;
 		case addr_setuptimeduse: setuptimeduse(); break;
 		case addr_edenscdplayer: edenscdplayer(); break;
diff --git a/engines/dreamweb/dreamgen.h b/engines/dreamweb/dreamgen.h
index 8f14cbddfb..7756a58c93 100644
--- a/engines/dreamweb/dreamgen.h
+++ b/engines/dreamweb/dreamgen.h
@@ -303,7 +303,6 @@ public:
 	static const uint16 addr_edenscdplayer = 0xc728;
 	static const uint16 addr_setuptimeduse = 0xc71c;
 	static const uint16 addr_autoappear = 0xc70c;
-	static const uint16 addr_dochange = 0xc708;
 	static const uint16 addr_switchryanoff = 0xc700;
 	static const uint16 addr_switchryanon = 0xc6fc;
 	static const uint16 addr_removefreeobject = 0xc6f4;
@@ -1389,7 +1388,7 @@ public:
 	void buttonfour();
 	void animpointer();
 	//void lockmon();
-	void dochange();
+	//void dochange();
 	void getanyaddir();
 	void showsaveops();
 	void intromonks1();
diff --git a/engines/dreamweb/structs.h b/engines/dreamweb/structs.h
index 8b8e1153e5..e47256186d 100644
--- a/engines/dreamweb/structs.h
+++ b/engines/dreamweb/structs.h
@@ -105,6 +105,25 @@ struct ObjData {
 	uint8 b63;
 };
 
+struct FreeObject {
+	uint8 b0;
+	uint8 b1;
+	uint8 b2;
+	uint8 b3;
+	uint8 b4;
+	uint8 b5;
+	uint8 b6;
+	uint8 b7;
+	uint8 b8;
+	uint8 b9;
+	uint8 b10;
+	uint8 b11;
+	uint8 b12;
+	uint8 b13;
+	uint8 b14;
+	uint8 b15;
+};
+
 struct ObjPos {
 	uint8 xMin;
 	uint8 yMin;
@@ -195,10 +214,10 @@ struct Rain {
 };
 
 struct Change {
-	uint8 b0;
+	uint8 index;
 	uint8 location;
-	uint8 b2;
-	uint8 b3;
+	uint8 value;
+	uint8 type;
 };
 
 
diff --git a/engines/dreamweb/stubs.cpp b/engines/dreamweb/stubs.cpp
index 0adb11e3a1..39c6e14b1f 100644
--- a/engines/dreamweb/stubs.cpp
+++ b/engines/dreamweb/stubs.cpp
@@ -1048,18 +1048,18 @@ void DreamGenContext::findormake() {
 	findormake(b0, b2, b3);
 }
 
-void DreamGenContext::findormake(uint8 b0, uint8 b2, uint8 b3) {
+void DreamGenContext::findormake(uint8 index, uint8 value, uint8 type) {
 	Change *change = (Change *)segRef(data.word(kBuffers)).ptr(kListofchanges, sizeof(Change));
 	while (true) {
-		if (change->b0 == 0xff) {
-			change->b0 = b0;
+		if (change->index == 0xff) {
+			change->index = index;
 			change->location = data.byte(kReallocation);
-			change->b2 = b2;
-			change->b3 = b3;
+			change->value = value;
+			change->type = type;
 			return;
 		}
-		if ((b0 == change->b0) && (data.byte(kReallocation) == change->location) && (b3 == change->b3)) {
-			change->b2 = b2;
+		if ((index == change->index) && (data.byte(kReallocation) == change->location) && (type == change->type)) {
+			change->value = value;
 			return;
 		}
 		++change;
@@ -1068,18 +1068,39 @@ void DreamGenContext::findormake(uint8 b0, uint8 b2, uint8 b3) {
 
 void DreamGenContext::setallchanges() {
 	Change *change = (Change *)segRef(data.word(kBuffers)).ptr(kListofchanges, sizeof(Change));
-	while (change->b0 != 0xff) {
-		if (change->location == data.byte(kReallocation)) {
-			al = change->b0;
-			ah = change->location;
-			cl = change->b2;
-			ch = change->b3;
-			dochange();
-		}
+	while (change->index != 0xff) {
+		if (change->location == data.byte(kReallocation))
+			dochange(change->index, change->value, change->type);
 		++change;
 	}
 }
 
+FreeObject *DreamGenContext::getfreead(uint8 index) {
+	return (FreeObject *)segRef(data.word(kFreedat)).ptr(0, 0) + index;
+}
+
+ObjData *DreamGenContext::getsetad(uint8 index) {
+	return (ObjData *)segRef(data.word(kSetdat)).ptr(0, 0) + index;
+}
+
+void DreamGenContext::dochange() {
+	dochange(al, cl, ch);
+}
+
+void DreamGenContext::dochange(uint8 index, uint8 value, uint8 type) {
+	if (type == 0) { //object
+		getsetad(index)->b58[0] = value;
+	} else if (type == 1) { //freeobject
+		FreeObject *freeObject = getfreead(index);
+		if (freeObject->b2 == 0xff)
+			freeObject->b2 = value;
+	} else { //path
+		bx = kPathdata + (type - 100) * 144 + index * 8;
+		es = data.word(kReels);
+		es.byte(bx+6) = value;
+	}
+}
+
 bool DreamGenContext::isCD() {
 	// The original sources has two codepaths depending if the game is 'if cd' or not
 	// This is a hack to guess which version to use with the assumption that if we have a cd version
diff --git a/engines/dreamweb/stubs.h b/engines/dreamweb/stubs.h
index 53d6458fb4..6d18ce4902 100644
--- a/engines/dreamweb/stubs.h
+++ b/engines/dreamweb/stubs.h
@@ -150,7 +150,11 @@
 	void personnametext();
 	void findxyfrompath();
 	void findormake();
-	void findormake(uint8 b0, uint8 b2, uint8 b3);
+	void findormake(uint8 index, uint8 value, uint8 type);
+	FreeObject *getfreead(uint8 index);
+	ObjData *getsetad(uint8 index);
 	void setallchanges();
+	void dochange();
+	void dochange(uint8 index, uint8 value, uint8 type);
 	bool isCD();
 
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