From 7af3cd565c2c62d4733b2272a841e0ead49988cd Mon Sep 17 00:00:00 2001
From: Bertrand Augereau
Date: Sun, 26 Jun 2011 15:17:19 +0200
Subject: DREAMWEB: C++-isation of a part of the sprite subsystem

---
 engines/dreamweb/dreamgen.cpp | 173 ------------------------------------------
 engines/dreamweb/dreamgen.h   |  22 ++----
 engines/dreamweb/stubs.cpp    | 170 ++++++++++++++++++++++++++++++++++++++++-
 engines/dreamweb/stubs.h      |  10 +--
 4 files changed, 180 insertions(+), 195 deletions(-)

(limited to 'engines/dreamweb')

diff --git a/engines/dreamweb/dreamgen.cpp b/engines/dreamweb/dreamgen.cpp
index 5b057686e9..90cffed8f4 100644
--- a/engines/dreamweb/dreamgen.cpp
+++ b/engines/dreamweb/dreamgen.cpp
@@ -2170,35 +2170,6 @@ forcenext:
 	_cmp(al, al);
 }
 
-void DreamGenContext::clearsprites() {
-	STACK_CHECK;
-	es = data.word(kBuffers);
-	di = (0+(228*13)+32+60+(32*32)+(11*10*3)+768+768+768);
-	al = 255;
-	cx = (32)*16;
-	_stosb(cx, true);
-}
-
-void DreamGenContext::makesprite() {
-	STACK_CHECK;
-	es = data.word(kBuffers);
-	bx = (0+(228*13)+32+60+(32*32)+(11*10*3)+768+768+768);
-_tmp17:
-	_cmp(es.byte(bx+15), 255);
-	if (flags.z())
-		goto _tmp17a;
-	_add(bx, (32));
-	goto _tmp17;
-_tmp17a:
-	es.word(bx) = cx;
-	es.word(bx+10) = si;
-	es.word(bx+6) = dx;
-	es.word(bx+8) = di;
-	es.word(bx+2) = 0x0ffff;
-	es.byte(bx+15) = 0;
-	es.byte(bx+18) = 0;
-}
-
 void DreamGenContext::delsprite() {
 	STACK_CHECK;
 	di = bx;
@@ -2207,117 +2178,6 @@ void DreamGenContext::delsprite() {
 	_stosb(cx, true);
 }
 
-void DreamGenContext::spriteupdate() {
-	STACK_CHECK;
-	es = data.word(kBuffers);
-	bx = (0+(228*13)+32+60+(32*32)+(11*10*3)+768+768+768);
-	al = data.byte(kRyanon);
-	es.byte(bx+31) = al;
-	es = data.word(kBuffers);
-	bx = (0+(228*13)+32+60+(32*32)+(11*10*3)+768+768+768);
-	cx = 16;
-_tmp18:
-	push(cx);
-	push(bx);
-	ax = es.word(bx);
-	_cmp(ax, 0x0ffff);
-	if (flags.z())
-		goto _tmp18a;
-	push(es);
-	push(ds);
-	cx = es.word(bx+2);
-	es.word(bx+24) = cx;
-	__dispatch_call(ax);
-	ds = pop();
-	es = pop();
-_tmp18a:
-	bx = pop();
-	cx = pop();
-	_cmp(data.byte(kNowinnewroom), 1);
-	if (flags.z())
-		return /* ($18b) */;
-	_add(bx, (32));
-	if (--cx)
-		goto _tmp18;
-}
-
-void DreamGenContext::printsprites() {
-	STACK_CHECK;
-	es = data.word(kBuffers);
-	cx = 0;
-priorityloop:
-	push(cx);
-	data.byte(kPriority) = cl;
-	bx = (0+(228*13)+32+60+(32*32)+(11*10*3)+768+768+768);
-	cx = 16;
-prtspriteloop:
-	push(cx);
-	push(bx);
-	ax = es.word(bx);
-	_cmp(ax, 0x0ffff);
-	if (flags.z())
-		goto skipsprite;
-	al = data.byte(kPriority);
-	_cmp(al, es.byte(bx+23));
-	if (!flags.z())
-		goto skipsprite;
-	_cmp(es.byte(bx+31), 1);
-	if (flags.z())
-		goto skipsprite;
-	printasprite();
-skipsprite:
-	bx = pop();
-	cx = pop();
-	_add(bx, (32));
-	if (--cx)
-		goto prtspriteloop;
-	cx = pop();
-	_inc(cx);
-	_cmp(cx, 7);
-	if (!flags.z())
-		goto priorityloop;
-}
-
-void DreamGenContext::printasprite() {
-	STACK_CHECK;
-	push(es);
-	push(bx);
-	si = bx;
-	ds = es.word(si+6);
-	al = es.byte(si+11);
-	ah = 0;
-	_cmp(al, 220);
-	if (flags.c())
-		goto notnegative1;
-	ah = 255;
-notnegative1:
-	bx = ax;
-	_add(bx, data.word(kMapady));
-	al = es.byte(si+10);
-	ah = 0;
-	_cmp(al, 220);
-	if (flags.c())
-		goto notnegative2;
-	ah = 255;
-notnegative2:
-	di = ax;
-	_add(di, data.word(kMapadx));
-	al = es.byte(si+15);
-	ah = 0;
-	_cmp(es.byte(si+30), 0);
-	if (flags.z())
-		goto steadyframe;
-	ah = 8;
-steadyframe:
-	_cmp(data.byte(kPriority), 6);
-	if (!flags.z())
-		goto notquickp;
-notquickp:
-	showframe();
-	bx = pop();
-	es = pop();
-}
-
 void DreamGenContext::checkone() {
 	STACK_CHECK;
 	push(cx);
@@ -8501,33 +8361,6 @@ _tmp28a:
 		goto _tmp28;
 }
 
-void DreamGenContext::eraseoldobs() {
-	STACK_CHECK;
-	_cmp(data.byte(kNewobs), 0);
-	if (flags.z())
-		return /* (donterase) */;
-	es = data.word(kBuffers);
-	bx = (0+(228*13)+32+60+(32*32)+(11*10*3)+768+768+768);
-	cx = 16;
-oberase:
-	push(cx);
-	push(bx);
-	ax = es.word(bx+20);
-	_cmp(ax, 0x0ffff);
-	if (flags.z())
-		goto notthisob;
-	di = bx;
-	al = 255;
-	cx = (32);
-	_stosb(cx, true);
-notthisob:
-	bx = pop();
-	cx = pop();
-	_add(bx, (32));
-	if (--cx)
-		goto oberase;
-}
-
 void DreamGenContext::showallobs() {
 	STACK_CHECK;
 	es = data.word(kBuffers);
@@ -22131,12 +21964,7 @@ void DreamGenContext::__dispatch_call(uint16 addr) {
 		case addr_addtopeoplelist: addtopeoplelist(); break;
 		case addr_showgamereel: showgamereel(); break;
 		case addr_checkspeed: checkspeed(); break;
-		case addr_clearsprites: clearsprites(); break;
-		case addr_makesprite: makesprite(); break;
 		case addr_delsprite: delsprite(); break;
-		case addr_spriteupdate: spriteupdate(); break;
-		case addr_printsprites: printsprites(); break;
-		case addr_printasprite: printasprite(); break;
 		case addr_checkone: checkone(); break;
 		case addr_findsource: findsource(); break;
 		case addr_initman: initman(); break;
@@ -22323,7 +22151,6 @@ void DreamGenContext::__dispatch_call(uint16 addr) {
 		case addr_addalong: addalong(); break;
 		case addr_addlength: addlength(); break;
 		case addr_drawflags: drawflags(); break;
-		case addr_eraseoldobs: eraseoldobs(); break;
 		case addr_showallobs: showallobs(); break;
 		case addr_makebackob: makebackob(); break;
 		case addr_showallfree: showallfree(); break;
diff --git a/engines/dreamweb/dreamgen.h b/engines/dreamweb/dreamgen.h
index 857d912ad0..dc9aebe4c0 100644
--- a/engines/dreamweb/dreamgen.h
+++ b/engines/dreamweb/dreamgen.h
@@ -490,7 +490,6 @@ public:
 	static const uint16 addr_showallfree = 0xc44c;
 	static const uint16 addr_makebackob = 0xc448;
 	static const uint16 addr_showallobs = 0xc444;
-	static const uint16 addr_eraseoldobs = 0xc440;
 	static const uint16 addr_drawflags = 0xc43c;
 	static const uint16 addr_addlength = 0xc438;
 	static const uint16 addr_addalong = 0xc434;
@@ -677,12 +676,7 @@ public:
 	static const uint16 addr_initman = 0xc134;
 	static const uint16 addr_findsource = 0xc130;
 	static const uint16 addr_checkone = 0xc12c;
-	static const uint16 addr_printasprite = 0xc128;
-	static const uint16 addr_printsprites = 0xc124;
-	static const uint16 addr_spriteupdate = 0xc120;
 	static const uint16 addr_delsprite = 0xc11c;
-	static const uint16 addr_makesprite = 0xc118;
-	static const uint16 addr_clearsprites = 0xc114;
 	static const uint16 addr_checkspeed = 0xc110;
 	static const uint16 addr_showgamereel = 0xc10c;
 	static const uint16 addr_addtopeoplelist = 0xc108;
@@ -892,7 +886,7 @@ public:
 	const static uint16 kSavex = 178;
 	const static uint16 kSavey = 179;
 	const static uint16 kCurrentob = 180;
-	const static uint16 kPriority = 181;
+	const static uint16 kPrioritydep = 181;
 	const static uint16 kDestpos = 182;
 	const static uint16 kReallocation = 183;
 	const static uint16 kRoomnum = 184;
@@ -1328,7 +1322,6 @@ public:
 	void drawitall();
 	void clearstartpal();
 	void femalefan();
-	void greyscalesum();
 	void showgamereel();
 	void identifyob();
 	void trysoundalloc();
@@ -1464,6 +1457,7 @@ public:
 	//void convertkey();
 	void outofopen();
 	void dealwithspecial();
+	//void eraseoldobs();
 	void dircom();
 	void liftsprite();
 	void dumpkeypad();
@@ -1526,7 +1520,7 @@ public:
 	void hotelbell();
 	void loadspeech();
 	//void cls();
-	void printsprites();
+	//void printsprites();
 	void dumptimedtext();
 	void showallobs();
 	void getnumber();
@@ -1558,7 +1552,7 @@ public:
 	void usekey();
 	void locklighton();
 	void useladderb();
-	void spriteupdate();
+	//void spriteupdate();
 	void usetempcharset();
 	void discops();
 	void printdirect();
@@ -1873,7 +1867,7 @@ public:
 	void finalframe();
 	void plotreel();
 	void swapwithopen();
-	void makesprite();
+	//void makesprite();
 	void dreamweb();
 	void droperror();
 	void openfilenocheck();
@@ -1916,12 +1910,12 @@ public:
 	void gettingshot();
 	void settopleft();
 	void searchforstring();
-	void clearsprites();
+	//void clearsprites();
 	void obpicture();
 	void selectopenob();
 	void widedoor();
 	void security();
-	void printasprite();
+	//void printasprite();
 	void buttonfive();
 	void soundonreels();
 	void usegun();
@@ -1949,7 +1943,7 @@ public:
 	//void width160();
 	void incryanpage();
 	void dodoor();
-	void eraseoldobs();
+	void greyscalesum();
 	void buttoneight();
 	void opensarters();
 	void findexobject();
diff --git a/engines/dreamweb/stubs.cpp b/engines/dreamweb/stubs.cpp
index 2d3c819561..5123655795 100644
--- a/engines/dreamweb/stubs.cpp
+++ b/engines/dreamweb/stubs.cpp
@@ -532,11 +532,16 @@ void DreamGenContext::frameoutv() {
 	uint16 pitch = dx;
 	uint16 width = cx & 0xff;
 	uint16 height = cx >> 8;
-	uint16 stride = pitch - width;
 
 	const uint8* src = ds.ptr(si, width * height);
-	uint8* base = es.ptr(di, stride * height);
-	uint8* dst = base + pitch * bx;
+	uint8* dst = es.ptr(di, pitch * height);
+
+	frameoutv(dst, src, pitch, width, height);
+}
+
+void DreamGenContext::frameoutv(uint8* dst, const uint8* src, uint16 pitch, uint16 width, uint16 height) {
+	uint16 stride = pitch - width;
+	dst += pitch * bx;
 
 	// NB: Original code assumes non-zero width and height, "for" are unneeded, do-while would suffice but would be less readable
 	for (uint16 y = 0; y < height; ++y) {
@@ -550,6 +555,165 @@ void DreamGenContext::frameoutv() {
 	}
 }
 
+Sprite* DreamGenContext::spritetable() {
+	push(es);
+	push(bx);
+
+	es = data.word(kBuffers);
+	bx = kSpritetable;
+	Sprite *sprite = (Sprite*)es.ptr(bx, 16*sizeof(Sprite));
+
+	bx = pop();
+	es = pop();
+
+	return sprite;
+}
+
+void DreamGenContext::printsprites() {
+	for (size_t priority = 0; priority < 7; ++priority) {
+		Sprite *sprites = spritetable();
+		for (size_t j = 0; j < 16; ++j) {
+			const Sprite &sprite = sprites[j];
+			if (READ_LE_UINT16(&sprite.updateCallback) == 0x0ffff)
+				continue;
+			if (priority != sprite.priority)
+				continue;
+			if (sprite.hidden == 1)
+				continue;
+			printasprite(&sprite);
+		}
+	}
+}
+
+void DreamGenContext::printasprite(const Sprite* sprite) {
+	push(es);
+	push(bx);
+	ds = READ_LE_UINT16(&sprite->w6);
+	ax = sprite->y;
+	if (al >= 220) {
+		bx = data.word(kMapady) - (256 - al);
+	} else {
+		bx = ax + data.word(kMapady);
+	}
+
+	ax = sprite->x;
+	if (al >= 220) {
+		di = data.word(kMapadx) - (256 - al);
+	} else {
+		di = ax + data.word(kMapadx);
+	}
+	
+	ax = sprite->b15;
+	if (sprite->type != 0)
+		ah = 8;
+	showframe(); // NB: Params in ax, bx, di,  ds:dx
+
+	bx = pop();
+	es = pop();
+}
+
+void DreamGenContext::eraseoldobs() {
+	if (data.byte(kNewobs) == 0)
+		return;
+
+	Sprite *sprites = spritetable();
+	for (size_t i=0; i<16; ++i) {
+		Sprite &sprite = sprites[i];
+		if (READ_LE_UINT16(&sprite.obj_data) != 0xffff) {
+			memset(&sprite, 0xff, sizeof(Sprite));
+		}
+	}
+}
+
+void DreamGenContext::clearsprites() {
+	memset(spritetable(), 0xff, sizeof(Sprite)*16);
+}
+
+Sprite* DreamGenContext::makesprite(uint8 x, uint8 y, uint16 updateCallback, uint16 somethingInDx, uint16 somethingInDi) {
+	Sprite *sprite = spritetable();
+	while (sprite->b15 != 0xff) { // NB: No boundchecking in the original code either
+		++sprite;
+	}
+
+	WRITE_LE_UINT16(&sprite->updateCallback, updateCallback);
+	sprite->x = x;
+	sprite->y = y;
+	WRITE_LE_UINT16(&sprite->w6, somethingInDx);
+	WRITE_LE_UINT16(&sprite->w8, somethingInDi);
+	sprite->w2 = 0xffff;
+	sprite->b15 = 0;
+	sprite->b18 = 0;
+	return sprite;
+}
+
+void DreamGenContext::makesprite() { // NB: returns new sprite in es:bx 
+	Sprite *sprite = makesprite(si & 0xff, si >> 8, cx, dx, di);
+
+	// Recover es:bx from sprite
+	es = data.word(kBuffers);
+	bx = kSpritetable;
+	Sprite *sprites = (Sprite*)es.ptr(bx, sizeof(Sprite)*16);
+	bx += sizeof(Sprite)*(sprite-sprites);
+	//
+}
+
+void DreamGenContext::spriteupdate() {
+	Sprite *sprites = spritetable();
+	sprites[0].hidden = data.byte(kRyanon);
+
+	Sprite *sprite = sprites;
+	for (size_t i=0; i<16; ++i) {
+		uint16 updateCallback = READ_LE_UINT16(&sprite->updateCallback);
+		if (updateCallback != 0xffff) {
+			sprite->w24 = sprite->w2;
+			if (updateCallback == addr_mainman) // NB : Let's consider the callback as an enum while more code is not ported to C++
+				mainmanCPP(sprite);
+			else {
+				assert(updateCallback == addr_backobject);
+				backobjectCPP(sprite);
+			}
+		}
+	
+		if (data.byte(kNowinnewroom) == 1)
+			break;
+		++sprite;
+	}
+}
+
+void DreamGenContext::mainmanCPP(Sprite* sprite) {
+	push(es);
+	push(ds);
+
+	// Recover es:bx from sprite
+	es = data.word(kBuffers);
+	bx = kSpritetable;
+	Sprite *sprites = (Sprite*)es.ptr(bx, sizeof(Sprite)*16);
+	bx += 32*(sprite-sprites);
+	//
+
+	mainman();
+
+	ds = pop();
+	es = pop();
+}
+
+void DreamGenContext::backobjectCPP(Sprite* sprite) {
+	push(es);
+	push(ds);
+
+	// Recover es:bx from sprite
+	es = data.word(kBuffers);
+	bx = kSpritetable;
+	Sprite *sprites = (Sprite*)es.ptr(bx, sizeof(Sprite)*16);
+	bx += 32*(sprite-sprites);
+	//
+
+	backobject();
+
+	ds = pop();
+	es = pop();
+}
+
 void DreamGenContext::modifychar() {
 	al = engine->modifyChar(al);
 }
diff --git a/engines/dreamweb/stubs.h b/engines/dreamweb/stubs.h
index 8b46989a7f..7f1e3b9f0c 100644
--- a/engines/dreamweb/stubs.h
+++ b/engines/dreamweb/stubs.h
@@ -5,7 +5,7 @@
 	void multiget();
 	void convertkey();
 	void cls();
-	//void printsprites();
+	void printsprites();
 	void quickquit();
 	void readoneblock();
 	void printundermon();
@@ -17,11 +17,11 @@
 	void printasprite(const Sprite* sprite);
 	void width160();
 	void multiput();
-	//void eraseoldobs();
-	//void clearsprites();
-	//void makesprite();
+	void eraseoldobs();
+	void clearsprites();
+	void makesprite();
 	Sprite* makesprite(uint8 x, uint8 y, uint16 updateCallback, uint16 somethingInDx, uint16 somethingInDi);
-	//void spriteupdate();
+	void spriteupdate();
 	void mainmanCPP(Sprite* sprite);
 	void backobjectCPP(Sprite* sprite);
 	void modifychar();
-- 
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