From 2aadfacc3247aa5dc0a11a25c6e7f7910f71e78c Mon Sep 17 00:00:00 2001
From: Patrice Mandin <patmandin@gmail.com>
Date: Tue, 12 Sep 2006 19:43:29 +0000
Subject: [PATCH] Allow mouse to be locked when grabbed with GEM driver

---
 src/video/ataricommon/SDL_xbiosevents.c      |  7 ++++++-
 src/video/ataricommon/SDL_xbiosevents_c.h    |  1 +
 src/video/ataricommon/SDL_xbiosinterrupt.S   | 11 +++++++++--
 src/video/ataricommon/SDL_xbiosinterrupt_s.h |  1 +
 4 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/src/video/ataricommon/SDL_xbiosevents.c b/src/video/ataricommon/SDL_xbiosevents.c
index 02626a218..b7e4e667e 100644
--- a/src/video/ataricommon/SDL_xbiosevents.c
+++ b/src/video/ataricommon/SDL_xbiosevents.c
@@ -50,7 +50,8 @@ SDL_AtariXbios_InstallVectors(int vectors_mask)
     void *oldpile;
 
     /* Clear variables */
-    SDL_AtariXbios_mouseb =
+    SDL_AtariXbios_mouselock =
+        SDL_AtariXbios_mouseb =
         SDL_AtariXbios_mousex =
         SDL_AtariXbios_mousey =
         SDL_AtariXbios_joystick = atari_prevmouseb = 0;
@@ -151,4 +152,8 @@ SDL_AtariXbios_PostMouseEvents(_THIS, SDL_bool buttonEvents)
     }
 }
 
+void SDL_AtariXbios_LockMousePosition(SDL_bool lockPosition)
+{
+    SDL_AtariXbios_mouselock = lockPosition;
+}
 /* vi: set ts=4 sw=4 expandtab: */
diff --git a/src/video/ataricommon/SDL_xbiosevents_c.h b/src/video/ataricommon/SDL_xbiosevents_c.h
index 8380bbe0a..7f7bec6a1 100644
--- a/src/video/ataricommon/SDL_xbiosevents_c.h
+++ b/src/video/ataricommon/SDL_xbiosevents_c.h
@@ -43,6 +43,7 @@ extern int SDL_AtariXbios_enabled;
 extern void SDL_AtariXbios_InstallVectors(int vectors_mask);
 extern void SDL_AtariXbios_RestoreVectors(void);
 extern void SDL_AtariXbios_PostMouseEvents(_THIS, SDL_bool buttonEvents);
+extern void SDL_AtariXbios_LockMousePosition(SDL_bool lockPosition);
 
 #endif /* _SDL_XBIOSEVENTS_H_ */
 /* vi: set ts=4 sw=4 expandtab: */
diff --git a/src/video/ataricommon/SDL_xbiosinterrupt.S b/src/video/ataricommon/SDL_xbiosinterrupt.S
index 548561ca4..a76df3768 100644
--- a/src/video/ataricommon/SDL_xbiosinterrupt.S
+++ b/src/video/ataricommon/SDL_xbiosinterrupt.S
@@ -33,6 +33,7 @@
 	.globl	_SDL_AtariXbios_MouseVector
 	.globl	_SDL_AtariXbios_JoystickVector
 
+	.globl	_SDL_AtariXbios_mouselock
 	.globl	_SDL_AtariXbios_mouseb
 	.globl	_SDL_AtariXbios_mousex
 	.globl	_SDL_AtariXbios_mousey
@@ -125,6 +126,13 @@ _SDL_AtariXbios_MouseVector:
 	extw	d0
 	addw	d0,_SDL_AtariXbios_mousey
 
+	/* Lock mouse position ? */
+	tstw	_SDL_AtariXbios_mouselock
+	beq.s	no_mouse_lock
+	clrb	a0@(1)
+	clrb	a0@(2)
+no_mouse_lock:
+
 	/* Jump through old vector */
 	movel	sp@+,d0
 
@@ -133,10 +141,9 @@ _SDL_AtariXbios_MouseVector:
 
 	.data
 	.even
+	.comm	_SDL_AtariXbios_mouselock,2*1
 	.comm	_SDL_AtariXbios_mousex,2*1
-	.even
 	.comm	_SDL_AtariXbios_mousey,2*1
-	.even
 	.comm	_SDL_AtariXbios_mouseb,2*1
 
 /*--- Our joystick vector ---*/
diff --git a/src/video/ataricommon/SDL_xbiosinterrupt_s.h b/src/video/ataricommon/SDL_xbiosinterrupt_s.h
index ce0f0e5ba..6e6e52332 100644
--- a/src/video/ataricommon/SDL_xbiosinterrupt_s.h
+++ b/src/video/ataricommon/SDL_xbiosinterrupt_s.h
@@ -36,6 +36,7 @@
 
 /* Variables */
 
+extern volatile Uint16 SDL_AtariXbios_mouselock;   /* mouse lock position */
 extern volatile Uint16 SDL_AtariXbios_mouseb;   /* buttons */
 extern volatile Sint16 SDL_AtariXbios_mousex;   /* X relative motion */
 extern volatile Sint16 SDL_AtariXbios_mousey;   /* Y relative motion */