Pereda Connection (1993) mouse position problem in DOSBox >= 0.60 *SOLVED* \ VOGONS

Pereda Connection (1993) mouse position problem in DOSBox >= 0.60 SOLVED

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First post, by pantercat

Posted on 2019-10-27, 12:42

pantercat Offline

Rank Newbie

Rank: Newbie
Posts: 59
Joined: 2018-09-06, 17:22

Hi, in Pereda Connection, a spanish graphic adventure, the internal mouse position is not correct (the mouse click is not sent where the mouse is displayed).

DOSBox >= 0.60 ...NOT OK
DOSBox = 0.58 ....OK

Related -> Bug #126 Mouse position problem in CM93 (fixed in 0.60) https://sourceforge.net/p/dosbox/bugs/126/

So I opened dosbox-0.58/src/ints/mouse.cpp and dosbox-0.60/src/ints/mouse.cpp in meld to see the differences. Here's a patch.

1--- dosbox-r4275/src/ints/mouse.cpp	2019-04-21 00:50:31.000000000 +0200
2+++ dosbox-r4275-patched/src/ints/mouse.cpp	2019-10-27 02:47:56.486745771 +0200
3@@ -421,7 +421,7 @@
4 	Bit16s x,y;
5 	Bit16u addx1,addx2,addy;
6 	Bit16u dataPos	= 0;
7-	Bit16s x1		= POS_X / xratio - mouse.hotx;
8+	Bit16s x1		= POS_X - mouse.hotx;
9 	Bit16s y1		= POS_Y - mouse.hoty;
10 	Bit16s x2		= x1 + CURSORX - 1;
11 	Bit16s y2		= y1 + CURSORY - 1;	
12@@ -437,7 +437,7 @@
13 		dataPos += addx2;
14 	};
15 	mouse.background= true;
16-	mouse.backposx	= POS_X / xratio - mouse.hotx;
17+	mouse.backposx	= POS_X - mouse.hotx;
18 	mouse.backposy	= POS_Y - mouse.hoty;
19 
20 	// Draw Mousecursor

With this patch applied on top of vanilla r4275 mouse behaviour is fine again in Pereda Connection, but obviously mouse position in CM93 is wrong again. It would be possible to make it work in both cases?

Anything you need just ask 😀 Thank you very much.

Last edited by pantercat on 2019-10-29, 00:04. Edited 1 time in total.

Reply 1 of 2, by ripsaw8080

Posted on 2019-10-27, 16:50

ripsaw8080 Offline

Rank DOSBox Author

Rank: DOSBox Author
Posts: 5034
Joined: 2006-04-25, 23:24

I see the same behavior as current source when loading mouse drivers (MS Mouse, CuteMouse, QTronix, et al.) The MANUAL.TXT file included with the game recommends not using the mouse, and one has to wonder why that would be recommended... In any case, I'm leaning toward this being an issue with the game itself and not with the internal mouse driver emulation of DOSBox.

Reply 2 of 2, by pantercat

Posted on 2019-10-29, 00:03

pantercat Offline

Rank Newbie

Rank: Newbie
Posts: 59
Joined: 2018-09-06, 17:22

I agree. I forgot to try other mouse drivers. Anyway here is a patch to adapt cutemouse v1.9 to the game for anyone interested.

1--- CTMOUSE.ASM	2002-10-01 02:09:00.000000000 +0200
2+++ CTMOUSE.ASM.PATCHED	2019-10-28 22:07:11.006362000 +0100
3@@ -1279,6 +1279,7 @@
4 ;ÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜ
5 
6 graphcursor	proc
7+		shl ax,1
8 		sub	ax,[hotspot.X]		; virtual X
9 		sub	bx,[hotspot.Y]		; virtual Y
10 		mov	si,16			; cursor height

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