devdraw: rewrite the Cocoa screen using Metal

Add a new macOS cocoa screen, cocoa-screen-metal.m.
Rewrite the macOS cocoa drawing code to use the builtin runloop,
and use Metal to push pixels with CAMetalLayer.

Remove all of the deprecated code, and simplify some of the logic.
Modify mkwsysrules.sh such that the new code is used only when
the system version is equal or higher than 10.14.

Allow touch events to simulate mouse clicks:
three finger tap for the middle mouse button;
four finger tap for the 2-1 chord.

Support Tresize.

Scale 16x16 Cursor up to 32x32 with an EPX algorithm.

Support macOS input sources including the basic dead keys and the
advanced CJK input methods.

Increase the communication buffers in cocoa-srv.c to allow more
input, especially for long sentences prepared by the macOS input
souces.

src/cmd/devdraw/bigarrow.h

@@ -1,11 +1,13 @@
 Cursor	bigarrow = {
-	{0, 0},
-	{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xFF, 0xFC, 
-	 0xFF, 0xF0, 0xFF, 0xF0, 0xFF, 0xF8, 0xFF, 0xFC, 
-	 0xFF, 0xFE, 0xFF, 0xFF, 0xFF, 0xFE, 0xFF, 0xFC, 
-	 0xF3, 0xF8, 0xF1, 0xF0, 0xE0, 0xE0, 0xC0, 0x40},
+	{ -1, -1 },
+	{ 0xFF, 0xFF, 0x80, 0x01, 0x80, 0x02, 0x80, 0x0C,
+	  0x80, 0x10, 0x80, 0x10, 0x80, 0x08, 0x80, 0x04,
+	  0x80, 0x02, 0x80, 0x01, 0x80, 0x02, 0x8C, 0x04,
+	  0x92, 0x08, 0x91, 0x10, 0xA0, 0xA0, 0xC0, 0x40,
+	},
 	{ 0x00, 0x00, 0x7F, 0xFE, 0x7F, 0xFC, 0x7F, 0xF0,
 	  0x7F, 0xE0, 0x7F, 0xE0, 0x7F, 0xF0, 0x7F, 0xF8,
 	  0x7F, 0xFC, 0x7F, 0xFE, 0x7F, 0xFC, 0x73, 0xF8,
-	 0x61, 0xF0, 0x60, 0xE0, 0x40, 0x40, 0x00, 0x00},
+	  0x61, 0xF0, 0x60, 0xE0, 0x40, 0x40, 0x00, 0x00,
+	},
 };

src/cmd/devdraw/cocoa-screen.h

@@ -16,5 +16,9 @@ void	servep9p(void);
 void	zlock(void);
 void	zunlock(void);
 
+void resizeimg(void);
+
 Rectangle mouserect;
+
 int mouseresized;
+void resizewindow(Rectangle);

src/cmd/devdraw/cocoa-srv.c

@@ -21,7 +21,7 @@ typedef struct Tagbuf Tagbuf;
 
 struct Kbdbuf
 {
-	Rune r[32];
+	Rune r[256];
 	int ri;
 	int wi;
 	int stall;
@@ -29,7 +29,7 @@ struct Kbdbuf
 
 struct Mousebuf
 {
-	Mouse m[32];
+	Mouse m[256];
 	Mouse last;
 	int ri;
 	int wi;
@@ -38,7 +38,7 @@ struct Mousebuf
 
 struct Tagbuf
 {
-	int t[32];
+	int t[256];
 	int ri;
 	int wi;
 };
@@ -97,7 +97,7 @@ servep9p(void)
 		/* pick off messages one by one */
 		if(convM2W(mbuf, nn+4, &m) <= 0)
 			sysfatal("cannot convert message");
-		if(trace) fprint(2, "<- %W\n", &m);
+		if(trace) fprint(2, "%ud [%d] <- %W\n", nsec()/1000000, threadid(), &m);
 		runmsg(&m);
 	}
 }
@@ -191,6 +191,7 @@ runmsg(Wsysmsg *m)
 		break;
 
 	case Trddraw:
+		zlock();
 		n = m->count;
 		if(n > sizeof buf)
 			n = sizeof buf;
@@ -202,13 +203,16 @@ runmsg(Wsysmsg *m)
 			m->data = buf;
 			replymsg(m);
 		}
+		zunlock();
 		break;
 
 	case Twrdraw:
+		zlock();
 		if(_drawmsgwrite(m->data, m->count) < 0)
 			replyerror(m);
 		else
 			replymsg(m);
+		zunlock();
 		break;
 	
 	case Ttop:
@@ -217,7 +221,9 @@ runmsg(Wsysmsg *m)
 		break;
 	
 	case Tresize:
-	//	_xresizewindow(m->rect);
+#if OSX_VERSION >= 101400
+		resizewindow(m->rect);
+#endif
 		replymsg(m);
 		break;
 	}
@@ -238,7 +244,7 @@ replymsg(Wsysmsg *m)
 	if(m->type%2 == 0)
 		m->type++;
 		
-	if(trace) fprint(2, "-> %W\n", m);
+	if(trace) fprint(2, "%ud [%d] -> %W\n", nsec()/1000000, threadid(), m);
 	/* copy to output buffer */
 	n = sizeW2M(m);
 
@@ -293,11 +299,11 @@ matchmouse(void)
 			mousetags.ri = 0;
 		m.mouse = mouse.m[mouse.ri];
 		m.resized = mouseresized;
+		mouseresized = 0;
 		/*
 		if(m.resized)
 			fprint(2, "sending resize\n");
 		*/
-		mouseresized = 0;
 		mouse.ri++;
 		if(mouse.ri == nelem(mouse.m))
 			mouse.ri = 0;
@@ -367,8 +373,6 @@ abortcompose(void)
 		keystroke(Kalt);
 }
 
-void resizeimg(void);
-
 void
 keystroke(int c)
 {

src/cmd/devdraw/cocoa-thread.c

@@ -25,4 +25,11 @@ qunlock(QLock *q)
 {
 	pthread_mutex_unlock(&q->m);
 }
+
+int
+threadid(void)
+{
+	return pthread_mach_thread_np(pthread_self());
+}
+
 #endif

src/cmd/devdraw/cocoa-thread.h

@@ -30,4 +30,5 @@
 
 	void	qlock(QLock*);
 	void	qunlock(QLock*);
+	int threadid(void);
 #endif

src/cmd/devdraw/mkfile

@@ -35,6 +35,9 @@ latin1.h: $PLAN9/lib/keyboard $O.mklatinkbd
 $O.macargv: $MACARGV
 	$LD -o $target $prereq
 
+cocoa-screen-metal-objc.$O: cocoa-screen-metal.m
+	$CC $CFLAGS $OBJCFLAGS -o $target cocoa-screen-metal.m
+
 %-objc.$O: %.m
 	$CC $CFLAGS -o $target $stem.m
 

src/cmd/devdraw/mkwsysrules.sh

@@ -60,7 +60,12 @@ elif [ $WSYSTYPE = osx ]; then
 	echo 'WSYSOFILES=$WSYSOFILES osx-screen-carbon-objc.o osx-draw.o osx-srv.o'
 	echo 'MACARGV=macargv.o'
 elif [ $WSYSTYPE = osx-cocoa ]; then
+	if sw_vers|awk '/ProductVersion/{split($2,a,".");exit(a[2]<14)}' >/dev/null; then	# 0 is true in sh.
+		echo 'OBJCFLAGS=$OBJCFLAGS -fobjc-arc'
+		echo 'WSYSOFILES=$WSYSOFILES osx-draw.o cocoa-screen-metal-objc.o cocoa-srv.o cocoa-thread.o'
+	else
 		echo 'WSYSOFILES=$WSYSOFILES osx-draw.o cocoa-screen-objc.o cocoa-srv.o cocoa-thread.o'
+	fi
 	echo 'MACARGV=macargv-objc.o'
 elif [ $WSYSTYPE = nowsys ]; then
 	echo 'WSYSOFILES=nowsys.o'