DREAMWEB: 'checkdest' ported to C++

5 files changed, 27 insertions, 56 deletions

diff --git a/devtools/tasmrecover/tasm-recover b/devtools/tasmrecover/tasm-recover
index ed4c9f1352..d4f4af715a 100755
--- a/devtools/tasmrecover/tasm-recover
+++ b/devtools/tasmrecover/tasm-recover
@@ -75,6 +75,7 @@ generator = cpp(context, "DreamGen", blacklist = [
 	'findsource',
 	'walking',
 	'autosetwalk',
+	'checkdest',
 	'spriteupdate',
 	'dodoor',
 	'lockeddoorway',
diff --git a/engines/dreamweb/dreamgen.cpp b/engines/dreamweb/dreamgen.cpp
index 291078169f..2a7c67e889 100644
--- a/engines/dreamweb/dreamgen.cpp
+++ b/engines/dreamweb/dreamgen.cpp
@@ -17359,56 +17359,6 @@ holdingreel:
 	data.byte(kWatchmode) = 2;
 }
 
-void DreamGenContext::checkdest() {
-	STACK_CHECK;
-	push(bx);
-	_add(bx, 12*8);
-	ah = data.byte(kManspath);
-	cl = 4;
-	_shl(ah, cl);
-	al = data.byte(kDestination);
-	cl = 24;
-	ch = data.byte(kDestination);
-checkdestloop:
-	dh = es.byte(bx);
-	_and(dh, 0xf0);
-	dl = es.byte(bx);
-	_and(dl, 0xf);
-	_cmp(ax, dx);
-	if (!flags.z())
-		goto nextcheck;
-	al = es.byte(bx+1);
-	_and(al, 15);
-	data.byte(kDestination) = al;
-	bx = pop();
-	return;
-nextcheck:
-	dl = es.byte(bx);
-	_and(dl, 0xf0);
-	_shr(dl, 1);
-	_shr(dl, 1);
-	_shr(dl, 1);
-	_shr(dl, 1);
-	dh = es.byte(bx);
-	_and(dh, 0xf);
-	_shl(dh, 1);
-	_shl(dh, 1);
-	_shl(dh, 1);
-	_shl(dh, 1);
-	_cmp(ax, dx);
-	if (!flags.z())
-		goto nextcheck2;
-	ch = es.byte(bx+1);
-	_and(ch, 15);
-nextcheck2:
-	_add(bx, 2);
-	_dec(cl);
-	if (!flags.z())
-		goto checkdestloop;
-	data.byte(kDestination) = ch;
-	bx = pop();
-}
-
 void DreamGenContext::bresenhams() {
 	STACK_CHECK;
 	workoutframes();
@@ -20137,7 +20087,6 @@ void DreamGenContext::__dispatch_call(uint16 addr) {
 		case addr_walktotext: walktotext(); break;
 		case addr_getflagunderp: getflagunderp(); break;
 		case addr_setwalk: setwalk(); break;
-		case addr_checkdest: checkdest(); break;
 		case addr_bresenhams: bresenhams(); break;
 		case addr_workoutframes: workoutframes(); break;
 		case addr_copyname: copyname(); break;
diff --git a/engines/dreamweb/dreamgen.h b/engines/dreamweb/dreamgen.h
index 18be264a9e..60abf44c01 100644
--- a/engines/dreamweb/dreamgen.h
+++ b/engines/dreamweb/dreamgen.h
@@ -119,7 +119,6 @@ public:
 	static const uint16 addr_copyname = 0xca5c;
 	static const uint16 addr_workoutframes = 0xca54;
 	static const uint16 addr_bresenhams = 0xca50;
-	static const uint16 addr_checkdest = 0xca4c;
 	static const uint16 addr_setwalk = 0xca44;
 	static const uint16 addr_getflagunderp = 0xca40;
 	static const uint16 addr_walktotext = 0xca3c;
@@ -1875,7 +1874,7 @@ public:
 	void makecaps();
 	void read();
 	void fadescreenups();
-	void checkdest();
+	//void checkdest();
 	//void initman();
 	void loadpalfromiff();
 	//void facerightway();
diff --git a/engines/dreamweb/stubs.cpp b/engines/dreamweb/stubs.cpp
index 6d2fee1ecd..cd6a9d6b4f 100644
--- a/engines/dreamweb/stubs.cpp
+++ b/engines/dreamweb/stubs.cpp
@@ -886,9 +886,8 @@ void DreamGenContext::autosetwalk() {
 	al = data.byte(kManspath);
 	if (data.byte(kFinaldest) == al)
 		return;
-	getroomspaths();
-	uint8 *roomsPaths = getroomspathsCPP();
-	checkdest();
+	const uint8 *roomsPaths = getroomspathsCPP();
+	checkdest(roomsPaths);
 	data.word(kLinestartx) = roomsPaths[data.byte(kManspath) * 8 + 0] - 12;
 	data.word(kLinestarty) = roomsPaths[data.byte(kManspath) * 8 + 1] - 12;
 	data.word(kLineendx) = roomsPaths[data.byte(kDestination) * 8 + 0] - 12;
@@ -902,5 +901,27 @@ void DreamGenContext::autosetwalk() {
 	data.byte(kLinepointer) = 0;
 }
 
+void DreamGenContext::checkdest(const uint8 *roomsPaths) {
+	const uint8 *p = roomsPaths + 12 * 8;
+	ah = data.byte(kManspath) << 4;
+	al = data.byte(kDestination);
+	uint8 destination = data.byte(kDestination);
+	for (size_t i = 0; i < 24; ++i) {
+		dh = p[0] & 0xf0;
+		dl = p[0] & 0x0f;
+		if (ax == dx) {
+			data.byte(kDestination) = p[1] & 0x0f;
+			return;
+		}
+		dl = (p[0] & 0xf0) >> 4;
+		dh = (p[0] & 0x0f) << 4;
+		if (ax == dx) {
+			destination = p[1] & 0x0f;
+		}
+		p += 2;
+	}
+	data.byte(kDestination) = destination;
+}
+
 } /*namespace dreamgen */
 
diff --git a/engines/dreamweb/stubs.h b/engines/dreamweb/stubs.h
index 809e5f45f7..746a75b97b 100644
--- a/engines/dreamweb/stubs.h
+++ b/engines/dreamweb/stubs.h
@@ -83,6 +83,7 @@
 	void walking();
 	void walking(Sprite *sprite);
 	void autosetwalk();
+	void checkdest(const uint8 *roomsPaths);
 	void aboutturn(Sprite *sprite);
 	void backobject(Sprite *sprite);
 	void constant(Sprite *sprite, ObjData *objData);