ac97: max buffer should be full samples, games/doom: enable/disable mouse grabbing when switching to the menu

sys/src/9/pc/audioac97.c

@@ -139,7 +139,7 @@ available(Ring *r)
 {
 	long m;
 
-	m = (r->nbuf - 1) - buffered(r);
+	m = (r->nbuf - BytesPerSample) - buffered(r);
 	if(m < 0)
 		m = 0;
 	return m;

sys/src/games/doom/i_system.c

@@ -17,6 +17,7 @@ void I_Init (void)
 {
 	I_InitSound();
 	I_InitGraphics();
+	I_MouseEnable(1);
 }
 
 byte* I_ZoneBase (int *size)

sys/src/games/doom/i_video.c

@@ -10,6 +10,7 @@
 #include <keyboard.h>
 
 static int resized;
+static int mouseactive;
 
 static Rectangle grabout;
 static Point center;
@@ -19,19 +20,6 @@ static void mouseproc(void*);
 
 static uchar cmap[3*256];
 
-static void
-nocursor(void)
-{
-	char curs[2*4+2*2*16];
-	int fd;
-
-	if((fd = open("/dev/cursor", ORDWR|OCEXEC)) < 0)
-		return;
-	memset(curs, 0, sizeof curs);
-	write(fd, curs, sizeof curs);
-}
-
-
 void I_InitGraphics(void)
 {
 	if(initdraw(nil, nil, "doom") < 0)
@@ -41,7 +29,6 @@ void I_InitGraphics(void)
 
 	center = addpt(screen->r.min, Pt(Dx(screen->r)/2, Dy(screen->r)/2));
 	grabout = insetrect(screen->r, Dx(screen->r)/8);
-	nocursor();
 
 	proccreate(kbdproc, nil, 8*1024);
 	proccreate(mouseproc, nil, 8*1024);
@@ -131,6 +118,22 @@ void I_FinishUpdate(void)
 	flushimage(display, 1);
 }
 
+void I_MouseEnable(int on)
+{
+	static char nocurs[2*4+2*2*16];
+	static int fd = -1;
+
+	if(mouseactive == on)
+		return;
+	if(mouseactive = on){
+		if((fd = open("/dev/cursor", ORDWR|OCEXEC)) < 0)
+			return;
+		write(fd, nocurs, sizeof(nocurs));
+	}else if(fd >= 0) {
+		close(fd);
+		fd = -1;
+	}
+}
 
 void I_ReadScreen(byte *scr)
 {
@@ -277,6 +280,9 @@ mouseproc(void *)
 			resized = 1;
 			/* fall through */
 		case 'm':
+			if(!mouseactive)
+				break;
+
 			m.xy.x = atoi(buf+1+0*12);
 			m.xy.y = atoi(buf+1+1*12);
 			m.buttons = atoi(buf+1+2*12);

sys/src/games/doom/i_video.h

@@ -44,6 +44,7 @@ void I_SetPalette (byte* palette);
 
 void I_UpdateNoBlit (void);
 void I_FinishUpdate (void);
+void I_MouseEnable (int);
 
 // Wait for vertical retrace or pause a bit.
 void I_WaitVBL(int count);
@@ -54,7 +55,6 @@ void I_BeginRead (void);
 void I_EndRead (void);
 
 
-
 #endif
 //-----------------------------------------------------------------------------
 //

sys/src/games/doom/m_menu.c

@@ -1710,10 +1710,12 @@ void M_StartControlPanel (void)
     // intro might call this repeatedly
     if (menuactive)
 	return;
-    
+  
     menuactive = 1;
     currentMenu = &MainDef;         // JDC
     itemOn = currentMenu->lastOn;   // JDC
+
+    I_MouseEnable(0);	// disable mouse grab
 }
 
 
@@ -1796,6 +1798,8 @@ void M_Drawer (void)
 void M_ClearMenus (void)
 {
     menuactive = 0;
+    I_MouseEnable(1);	// enable mouse grabbing
+
     // if (!netgame && usergame && paused)
     //       sendpause = true;
 }