shithub: drawterm

Download patch

ref: 0085f650ef3f481692b52c5389a3483421834998
parent: 638a4aaaa3a837efe603efcf48ce6e33a4fd4161
author: Jacob Moody <moody@posixcafe.org>
date: Mon Aug 14 14:18:49 EDT 2023 

gui-cocoa: opengl -> metal (thanks jxy & Keegan)

OpenGL on mac, as it is used here, is nearing end of life. This
replaces it with metal. In the process this also gets rid of
the XCode requirement, which is a nice bonus.

This does bump our minimum required macos to be OS X EL Capitan.


--- a/Make.osx-cocoa
+++ b/Make.osx-cocoa
@@ -8,7 +8,7 @@
 O=o
 OS=posix
 GUI=cocoa
-LDADD=-ggdb -framework AppKit -framework OpenGL
+LDADD=-ggdb -framework Cocoa -framework Metal -framework QuartzCore
 LDFLAGS=$(PTHREAD)
 TARG=drawterm
 AUDIO=none
--- a/gui-cocoa/MainWindow.xib
+++ /dev/null
@@ -1,55 +1,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="14113" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
-    <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="14113"/>
-        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
-    </dependencies>
-    <objects>
-        <customObject id="-2" userLabel="File's Owner" customClass="NSApplication">
-            <connections>
-                <outlet property="delegate" destination="Voe-Tx-rLC" id="GzC-gU-4Uq"/>
-            </connections>
-        </customObject>
-        <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
-        <customObject id="-3" userLabel="Application"/>
-        <customObject id="Voe-Tx-rLC" customClass="AppDelegate">
-            <connections>
-                <outlet property="view" destination="xvG-Jd-fNZ" id="fqw-g6-9Ci"/>
-                <outlet property="window" destination="QvC-M9-y7g" id="gIp-Ho-8D9"/>
-            </connections>
-        </customObject>
-        <customObject id="YLy-65-1bz" customClass="NSFontManager"/>
-        <menu title="Main Menu" systemMenu="main" id="AYu-sK-qS6">
-            <items>
-                <menuItem title="drawterm" id="1Xt-HY-uBw">
-                    <modifierMask key="keyEquivalentModifierMask"/>
-                    <menu key="submenu" title="drawterm" systemMenu="apple" id="uQy-DD-JDr">
-                        <items>
-                            <menuItem title="Quit drawterm" keyEquivalent="q" id="4sb-4s-VLi">
-                                <connections>
-                                    <action selector="terminate:" target="-1" id="Te7-pn-YzF"/>
-                                </connections>
-                            </menuItem>
-                        </items>
-                    </menu>
-                </menuItem>
-            </items>
-        </menu>
-        <window title="drawterm" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" animationBehavior="default" id="QvC-M9-y7g">
-            <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES"/>
-            <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
-            <rect key="contentRect" x="128" y="128" width="1024" height="768"/>
-            <rect key="screenRect" x="0.0" y="0.0" width="2560" height="1417"/>
-            <view key="contentView" wantsLayer="YES" id="EiT-Mj-1SZ">
-                <rect key="frame" x="0.0" y="0.0" width="480" height="360"/>
-                <autoresizingMask key="autoresizingMask"/>
-                <subviews>
-                    <customView fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="xvG-Jd-fNZ" customClass="DrawtermView">
-                        <rect key="frame" x="0.0" y="0.0" width="480" height="360"/>
-                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
-                    </customView>
-                </subviews>
-            </view>
-        </window>
-    </objects>
-</document>
--- a/gui-cocoa/Makefile
+++ b/gui-cocoa/Makefile
@@ -5,7 +5,7 @@
 OFILES=\
 	screen.$O
 
-default: $(LIB) drawterm.app/MainWindow.nib
+default: $(LIB)
 $(LIB): $(OFILES)
 	$(AR) r $(LIB) $(OFILES)
 	$(RANLIB) $(LIB)
@@ -12,6 +12,3 @@
 
 %.$O: %.m
 	$(CC) $(CFLAGS) -fobjc-arc $*.m
-
-drawterm.app/MainWindow.nib: MainWindow.xib
-	ibtool --compile $@ $<
--- a/gui-cocoa/screen.m
+++ b/gui-cocoa/screen.m
@@ -1,6 +1,7 @@
 #define Rect RectC
 #import <Cocoa/Cocoa.h>
-#include <OpenGL/GL.h>
+#import <Metal/Metal.h>
+#import <QuartzCore/CAMetalLayer.h>
 #undef Rect
 
 #undef nil
@@ -16,50 +17,55 @@
 #include "screen.h"
 #include "keyboard.h"
 
-@interface AppDelegate : NSObject <NSApplicationDelegate>
+#ifndef DEBUG
+#define DEBUG 0
+#endif
+#define LOG(fmt, ...) if(DEBUG)NSLog((@"%s:%d %s " fmt), __FILE__, __LINE__, __PRETTY_FUNCTION__, ##__VA_ARGS__)
+
+Memimage *gscreen;
+
+@interface DrawLayer : CAMetalLayer
+@property id<MTLTexture> texture;
 @end
 
-@interface AppDelegate ()
-@property (assign) IBOutlet NSWindow *window;
-@property (assign) IBOutlet NSOpenGLView *view;
+@interface DrawtermView : NSView<NSTextInputClient>
+- (void)reshape;
+- (void)clearMods;
+- (void)clearInput;
+- (void)mouseevent:(NSEvent *)e;
+- (void)resetLastInputRect;
+- (void)enlargeLastInputRect:(NSRect)r;
 @end
 
-@interface DrawtermView : NSOpenGLView
-@property (nonatomic, retain) NSCursor *currentCursor;
-@property (nonatomic, assign) GLuint tex;
-
-- (void) drawRect:(NSRect)rect;
-- (void) keyDown:(NSEvent*)event;
-- (void) flagsChanged:(NSEvent*)event;
-- (void) keyUp:(NSEvent*)event;
-- (void) mouseDown:(NSEvent*)event;
-- (void) mouseDragged:(NSEvent*)event;
-- (void) mouseUp:(NSEvent*)event;
-- (void) mouseMoved:(NSEvent*)event;
-- (void) rightMouseDown:(NSEvent*)event;
-- (void) rightMouseDragged:(NSEvent*)event;
-- (void) rightMouseUp:(NSEvent*)event;
-- (void) otherMouseDown:(NSEvent*)event;
-- (void) otherMouseDragged:(NSEvent*)event;
-- (void) otherMouseUp:(NSEvent*)event;
-- (void) scrollWheel:(NSEvent*)event;
-- (BOOL) acceptsFirstResponder;
-- (void) reshape;
-- (BOOL) acceptsMouseMovedEvents;
-- (void) prepareOpenGL;
-- (void) resetCursorRects;
+@interface AppDelegate : NSObject <NSApplicationDelegate, NSWindowDelegate>
 @end
 
-Memimage *gscreen;
+static AppDelegate *myApp;
 static DrawtermView *myview;
-static NSSize winsize;
+static NSCursor *currentCursor;
 
+static ulong pal[256];
+
+static int readybit;
+static Rendez rend;
+
+static int
+isready(void*a)
+{
+	return readybit;
+}
+
 void
 guimain(void)
 {
-	static const char *args[] = {"drawterm", NULL};
-
-	NSApplicationMain(1, args);
+	LOG();
+	@autoreleasepool{
+		[NSApplication sharedApplication];
+		[NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
+		myApp = [AppDelegate new];
+		[NSApp setDelegate:myApp];
+		[NSApp run];
+	}
 }
 
 void
@@ -66,11 +72,13 @@
 screeninit(void)
 {
 	memimageinit();
-	screensize(Rect(0, 0, winsize.width, winsize.height), ABGR32);
-	gscreen->clipr = Rect(0, 0, winsize.width, winsize.height);
-	qlock(&drawlock);
+	NSSize s = [myview convertSizeToBacking:myview.frame.size];
+	screensize(Rect(0, 0, s.width, s.height), ARGB32);
+	gscreen->clipr = Rect(0, 0, s.width, s.height);
+	LOG(@"%g %g", s.width, s.height);
 	terminit();
-	qunlock(&drawlock);
+	readybit = 1;
+	wakeup(&rend);
 }
 
 void
@@ -82,6 +90,22 @@
 		return;
 	if(gscreen != nil)
 		freememimage(gscreen);
+@autoreleasepool{
+	DrawLayer *layer = (DrawLayer *)myview.layer;
+	MTLTextureDescriptor *textureDesc = [MTLTextureDescriptor
+		texture2DDescriptorWithPixelFormat:MTLPixelFormatBGRA8Unorm
+		width:Dx(r)
+		height:Dy(r)
+		mipmapped:NO];
+	textureDesc.allowGPUOptimizedContents = YES;
+	textureDesc.usage = MTLTextureUsageShaderRead;
+	textureDesc.cpuCacheMode = MTLCPUCacheModeWriteCombined;
+	layer.texture = [layer.device newTextureWithDescriptor:textureDesc];
+
+	CGFloat scale = myview.window.backingScaleFactor;
+	[layer setDrawableSize:NSMakeSize(Dx(r), Dy(r))];
+	[layer setContentsScale:scale];
+}
 	gscreen = i;
 	gscreen->clipr = ZR;
 }
@@ -89,6 +113,7 @@
 Memdata*
 attachscreen(Rectangle *r, ulong *chan, int *depth, int *width, int *softscreen)
 {
+	LOG();
 	*r = gscreen->clipr;
 	*chan = gscreen->chan;
 	*depth = gscreen->depth;
@@ -102,12 +127,12 @@
 char *
 clipread(void)
 {
-	NSPasteboard *pb = [NSPasteboard generalPasteboard];
-	NSArray *classes = [NSArray arrayWithObjects:[NSString class], nil];
-	NSDictionary *options = [NSDictionary dictionary];
-	NSArray *it = [pb readObjectsForClasses:classes options:options];
-	if(it != nil && [it count] > 0)
-		return strdup([it[0] UTF8String]);
+	@autoreleasepool{
+		NSPasteboard *pb = [NSPasteboard generalPasteboard];
+		NSString *s = [pb stringForType:NSPasteboardTypeString];
+		if(s)
+			return strdup([s UTF8String]);
+	}
 	return nil;
 }
 
@@ -114,10 +139,12 @@
 int
 clipwrite(char *buf)
 {
-	NSString *s = [[NSString alloc] initWithUTF8String:buf];
-	NSPasteboard *pb = [NSPasteboard generalPasteboard];
-	[pb clearContents];
-	[pb writeObjects:@[s]];
+	@autoreleasepool{
+		NSString *s = [[NSString alloc] initWithUTF8String:buf];
+		NSPasteboard *pb = [NSPasteboard generalPasteboard];
+		[pb clearContents];
+		[pb writeObjects:@[s]];
+	}
 	return strlen(buf);
 }
 
@@ -124,44 +151,98 @@
 void
 flushmemscreen(Rectangle r)
 {
-	uchar *buf;
-	ulong sz;
-
+	LOG(@"<- %d %d %d %d", r.min.x, r.min.y, Dx(r), Dy(r));
 	if(rectclip(&r, gscreen->clipr) == 0)
 		return;
-	sz = Dx(r) * Dy(r) * 4;
-	buf = malloc(sz);
-	unloadmemimage(gscreen, r, buf, sz);
-	dispatch_async(dispatch_get_main_queue(), ^(void){
-		[[myview openGLContext] makeCurrentContext];
-		glBindTexture(GL_TEXTURE_2D, myview.tex);
-		glTexSubImage2D(GL_TEXTURE_2D, 0, r.min.x, r.min.y, Dx(r), Dy(r), GL_RGBA, GL_UNSIGNED_BYTE, buf);
-		free(buf);
-		[NSOpenGLContext clearCurrentContext];
-		[myview setNeedsDisplay:YES];
-	});
+	LOG(@"-> %d %d %d %d", r.min.x, r.min.y, Dx(r), Dy(r));
+	@autoreleasepool{
+		[((DrawLayer *)myview.layer).texture
+			replaceRegion:MTLRegionMake2D(r.min.x, r.min.y, Dx(r), Dy(r))
+			mipmapLevel:0
+			withBytes:byteaddr(gscreen, Pt(r.min.x, r.min.y))
+			bytesPerRow:gscreen->width * 4];
+		NSRect sr = [[myview window] convertRectFromBacking:NSMakeRect(r.min.x, r.min.y, Dx(r), Dy(r))];
+		dispatch_async(dispatch_get_main_queue(), ^(void){@autoreleasepool{
+			LOG(@"setNeedsDisplayInRect %g %g %g %g", sr.origin.x, sr.origin.y, sr.size.width, sr.size.height);
+			[myview setNeedsDisplayInRect:sr];
+			[myview enlargeLastInputRect:sr];
+		}});
+		// ReplaceRegion is somehow asynchronous since 10.14.5.  We wait sometime to request a update again.
+		dispatch_time_t time = dispatch_time(DISPATCH_TIME_NOW, 8 * NSEC_PER_MSEC);
+		dispatch_after(time, dispatch_get_main_queue(), ^(void){@autoreleasepool{
+			LOG(@"setNeedsDisplayInRect %g %g %g %g again", sr.origin.x, sr.origin.y, sr.size.width, sr.size.height);
+			[myview setNeedsDisplayInRect:sr];
+		}});
+		time = dispatch_time(DISPATCH_TIME_NOW, 16 * NSEC_PER_MSEC);
+		dispatch_after(time, dispatch_get_main_queue(), ^(void){@autoreleasepool{
+			LOG(@"setNeedsDisplayInRect %g %g %g %g again", sr.origin.x, sr.origin.y, sr.size.width, sr.size.height);
+			[myview setNeedsDisplayInRect:sr];
+		}});
+	}
 }
 
 void
-getcolor(ulong a, ulong *b, ulong *c, ulong *d)
+getcolor(ulong i, ulong *r, ulong *g, ulong *b)
 {
+	ulong v;
+
+	v = pal[i];
+	*r = (v>>16)&0xFF;
+	*g = (v>>8)&0xFF;
+	*b = v&0xFF;
 }
 
 void
-setcolor(ulong a, ulong b, ulong c, ulong d)
+setcolor(ulong i, ulong r, ulong g, ulong b)
 {
+	pal[i] = ((r&0xFF)<<16) & ((g&0xFF)<<8) & (b&0xFF);
 }
 
 void
 setcursor(void)
 {
-	NSPoint p;
-	NSBitmapImageRep *r;
-	unsigned char *plane[5];
-	int b;
+	static unsigned char data[64], data2[256];
+	unsigned char *planes[2] = {&data[0], &data[32]};
+	unsigned char *planes2[2] = {&data2[0], &data2[128]};
+	unsigned int i, x, y, a;
+	unsigned char pu, pb, pl, pr, pc;  // upper, bottom, left, right, center
+	unsigned char pul, pur, pbl, pbr;
+	unsigned char ful, fur, fbl, fbr;
 
-	r = [[NSBitmapImageRep alloc]
-		initWithBitmapDataPlanes:nil
+	lock(&cursor.lk);
+	for(i = 0; i < 32; i++){
+		data[i] = ~cursor.set[i] & cursor.clr[i];
+		data[i+32] = cursor.set[i] | cursor.clr[i];
+	}
+	for(a=0; a<2; a++){
+		for(y=0; y<16; y++){
+			for(x=0; x<2; x++){
+				pc = planes[a][x+2*y];
+				pu = y==0 ? pc : planes[a][x+2*(y-1)];
+				pb = y==15 ? pc : planes[a][x+2*(y+1)];
+				pl = (pc>>1) | (x==0 ? pc&0x80 : (planes[a][x-1+2*y]&1)<<7);
+				pr = (pc<<1) | (x==1 ? pc&1 : (planes[a][x+1+2*y]&0x80)>>7);
+				ful = ~(pl^pu) & (pl^pb) & (pu^pr);
+				pul = (ful & pu) | (~ful & pc);
+				fur = ~(pu^pr) & (pu^pl) & (pr^pb);
+				pur = (fur & pr) | (~fur & pc);
+				fbl = ~(pb^pl) & (pb^pr) & (pl^pu);
+				pbl = (fbl & pl) | (~fbl & pc);
+				fbr = ~(pr^pb) & (pr^pu) & (pb^pl);
+				pbr = (fbr & pb) | (~fbr & pc);
+				planes2[a][2*x+4*2*y] = (pul&0x80) | ((pul&0x40)>>1)  | ((pul&0x20)>>2) | ((pul&0x10)>>3)
+					| ((pur&0x80)>>1) | ((pur&0x40)>>2)  | ((pur&0x20)>>3) | ((pur&0x10)>>4);
+				planes2[a][2*x+1+4*2*y] = ((pul&0x8)<<4) | ((pul&0x4)<<3)  | ((pul&0x2)<<2) | ((pul&0x1)<<1)
+					| ((pur&0x8)<<3) | ((pur&0x4)<<2)  | ((pur&0x2)<<1) | (pur&0x1);
+				planes2[a][2*x+4*(2*y+1)] =  (pbl&0x80) | ((pbl&0x40)>>1)  | ((pbl&0x20)>>2) | ((pbl&0x10)>>3)
+					| ((pbr&0x80)>>1) | ((pbr&0x40)>>2)  | ((pbr&0x20)>>3) | ((pbr&0x10)>>4);
+				planes2[a][2*x+1+4*(2*y+1)] = ((pbl&0x8)<<4) | ((pbl&0x4)<<3)  | ((pbl&0x2)<<2) | ((pbl&0x1)<<1)
+					| ((pbr&0x8)<<3) | ((pbr&0x4)<<2)  | ((pbr&0x2)<<1) | (pbr&0x1);
+			}
+		}
+	}
+	NSBitmapImageRep *rep = [[NSBitmapImageRep alloc]
+		initWithBitmapDataPlanes:planes
 		pixelsWide:16
 		pixelsHigh:16
 		bitsPerSample:1
@@ -172,22 +253,24 @@
 		bitmapFormat:0
 		bytesPerRow:2
 		bitsPerPixel:0];
-	[r getBitmapDataPlanes:plane];
-	assert(plane[0]!=nil && plane[1]!=nil);
-
-	lock(&cursor.lk);
-	for(b=0; b < nelem(cursor.set); b++){
-		plane[0][b] = ~cursor.set[b] & cursor.clr[b];
-		plane[1][b] =  cursor.set[b] | cursor.clr[b];
-	}
-	p = NSMakePoint(-cursor.offset.x, -cursor.offset.y);
+	NSBitmapImageRep *rep2 = [[NSBitmapImageRep alloc]
+		initWithBitmapDataPlanes:planes2
+		pixelsWide:32
+		pixelsHigh:32
+		bitsPerSample:1
+		samplesPerPixel:2
+		hasAlpha:YES
+		isPlanar:YES
+		colorSpaceName:NSDeviceWhiteColorSpace
+		bitmapFormat:0
+		bytesPerRow:4
+		bitsPerPixel:0];
+	NSImage *img = [[NSImage alloc] initWithSize:NSMakeSize(16, 16)];
+	[img addRepresentation:rep2];
+	[img addRepresentation:rep];
+	currentCursor = [[NSCursor alloc] initWithImage:img hotSpot:NSMakePoint(-cursor.offset.x, -cursor.offset.y)];
 	unlock(&cursor.lk);
 
-	NSImage *i = [[NSImage alloc] initWithSize:NSMakeSize(16, 16)];
-	[i addRepresentation:r];
-
-	myview.currentCursor = [[NSCursor alloc] initWithImage:i hotSpot:p];
-
 	dispatch_async(dispatch_get_main_queue(), ^(void){
 		[[myview window] invalidateCursorRectsForView:myview];
 	});
@@ -196,87 +279,169 @@
 void
 mouseset(Point p)
 {
-	dispatch_async(dispatch_get_main_queue(), ^(void){
-		NSRect r;
+	dispatch_async(dispatch_get_main_queue(), ^(void){@autoreleasepool{
+		NSPoint s;
 
-		r.origin.x = p.x;
-		r.origin.y = p.y;
-		r.size.width = 1;
-		r.size.height = 1;
-		r = [myview.window convertRectToScreen:r];
-		CGWarpMouseCursorPosition(r.origin);
-	});
+		if([[myview window] isKeyWindow]){
+			s = NSMakePoint(p.x, p.y);
+			LOG(@"-> pixel  %g %g", s.x, s.y);
+			s = [[myview window] convertPointFromBacking:s];
+			LOG(@"-> point  %g %g", s.x, s.y);
+			s = [myview convertPoint:s toView:nil];
+			LOG(@"-> window %g %g", s.x, s.y);
+			s = [[myview window] convertPointToScreen: s];
+			LOG(@"(%g, %g) <- toScreen", s.x, s.y);
+			s.y = NSScreen.screens[0].frame.size.height - s.y;
+			LOG(@"(%g, %g) <- setmouse", s.x, s.y);
+			CGWarpMouseCursorPosition(s);
+			CGAssociateMouseAndMouseCursorPosition(true);
+		}
+	}});
 }
 
-
 @implementation AppDelegate
+{
+	NSWindow *_window;
+}
 
-void
+static void
 mainproc(void *aux)
 {
 	cpubody();
 }
 
-- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
-	setcursor();
+- (void) applicationDidFinishLaunching:(NSNotification *)aNotification
+{
+	LOG(@"BEGIN");
+
+	NSMenu *sm = [NSMenu new];
+	[sm addItemWithTitle:@"Toggle Full Screen" action:@selector(toggleFullScreen:) keyEquivalent:@"f"];
+	[sm addItemWithTitle:@"Hide" action:@selector(hide:) keyEquivalent:@"h"];
+	[sm addItemWithTitle:@"Quit" action:@selector(terminate:) keyEquivalent:@"q"];
+	NSMenu *m = [NSMenu new];
+	[m addItemWithTitle:@"DEVDRAW" action:NULL keyEquivalent:@""];
+	[m setSubmenu:sm forItem:[m itemWithTitle:@"DEVDRAW"]];
+	[NSApp setMainMenu:m];
+
+	const NSWindowStyleMask Winstyle = NSWindowStyleMaskTitled
+		| NSWindowStyleMaskClosable
+		| NSWindowStyleMaskMiniaturizable
+		| NSWindowStyleMaskResizable;
+
+	NSRect r = [[NSScreen mainScreen] visibleFrame];
+
+	r.size.width = r.size.width*3/4;
+	r.size.height = r.size.height*3/4;
+	r = [NSWindow contentRectForFrameRect:r styleMask:Winstyle];
+
+	_window = [[NSWindow alloc] initWithContentRect:r styleMask:Winstyle
+		backing:NSBackingStoreBuffered defer:NO];
+	[_window setTitle:@"drawterm"];
+	[_window center];
+	[_window setCollectionBehavior:NSWindowCollectionBehaviorFullScreenPrimary];
+	[_window setContentMinSize:NSMakeSize(64,64)];
+	[_window setOpaque:YES];
 	[_window setRestorable:NO];
-	[_window setAcceptsMouseMovedEvents:TRUE];
-	myview = _view;
-	winsize = _view.frame.size;
+	[_window setAcceptsMouseMovedEvents:YES];
+	[_window setDelegate:self];
+
+	myview = [DrawtermView new];
+	[_window setContentView:myview];
+
+	[NSEvent setMouseCoalescingEnabled:NO];
+	setcursor();
+
+	[_window makeKeyAndOrderFront:self];
+	[NSApp activateIgnoringOtherApps:YES];
+
+	LOG(@"launch mainproc");
 	kproc("mainproc", mainproc, 0);
+	ksleep(&rend, isready, 0);
 }
 
-
-- (void)applicationWillTerminate:(NSNotification *)aNotification {
+- (NSApplicationPresentationOptions) window:(NSWindow *)window
+		willUseFullScreenPresentationOptions:(NSApplicationPresentationOptions)proposedOptions
+{
+	NSApplicationPresentationOptions o;
+	o = proposedOptions;
+	o &= ~(NSApplicationPresentationAutoHideDock | NSApplicationPresentationAutoHideMenuBar);
+	o |= NSApplicationPresentationHideDock | NSApplicationPresentationHideMenuBar;
+	return o;
 }
 
-- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication {
+- (BOOL) applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication
+{
 	return YES;
 }
 
-@end
+- (void) windowDidBecomeKey:(id)arg
+{
+	NSPoint p;
+	p = [_window convertPointToBacking:[_window mouseLocationOutsideOfEventStream]];
+	absmousetrack(p.x, [myview convertSizeToBacking:myview.frame.size].height - p.y, 0, ticks());
+}
 
+- (void) windowDidResignKey:(id)arg
+{
+	[myview clearMods];
+}
 
+@end
+
 @implementation DrawtermView
+{
+	NSMutableString *_tmpText;
+	NSRange _markedRange;
+	NSRange _selectedRange;
+	NSRect _lastInputRect;	// The view is flipped, this is not.
+	BOOL _tapping;
+	NSUInteger _tapFingers;
+	NSUInteger _tapTime;
+	BOOL _breakcompose;
+	NSEventModifierFlags _mods;
+}
 
-- (void) prepareOpenGL {
-	glGenTextures(1, &_tex);
-	glBindTexture(GL_TEXTURE_2D, _tex);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-	glEnable(GL_TEXTURE_2D);
-	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, self.frame.size.width, self.frame.size.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
-	glMatrixMode(GL_PROJECTION);
-	glLoadIdentity();
-	glOrtho(0, 1, 1, 0, -1, 1);
-	glMatrixMode(GL_MODELVIEW);
+- (id) initWithFrame:(NSRect)fr
+{
+	LOG(@"BEGIN");
+	self = [super initWithFrame:fr];
+	[self setWantsLayer:YES];
+	[self setLayerContentsRedrawPolicy:NSViewLayerContentsRedrawOnSetNeedsDisplay];
+	[self setAllowedTouchTypes:NSTouchTypeMaskDirect|NSTouchTypeMaskIndirect];
+	_tmpText = [[NSMutableString alloc] initWithCapacity:2];
+	_markedRange = NSMakeRange(NSNotFound, 0);
+	_selectedRange = NSMakeRange(0, 0);
+	_breakcompose = NO;
+	_mods = 0;
+	LOG(@"END");
+	return self;
 }
 
-- (void) drawRect:(NSRect)rect
+- (CALayer *) makeBackingLayer
 {
-	glBindTexture(GL_TEXTURE_2D, _tex);
-	glClearColor(0, 0, 0, 0);
-	glClear(GL_COLOR_BUFFER_BIT);
-	glColor4f(1.0, 1.0, 1.0, 1.0);
-	glBegin(GL_TRIANGLES);
-	glTexCoord2f(0.0, 0.0); glVertex2f(0.0, 0.0);
-	glTexCoord2f(1.0, 0.0); glVertex2f(1.0, 0.0);
-	glTexCoord2f(0.0, 1.0); glVertex2f(0.0, 1.0);
-	glTexCoord2f(0.0, 1.0); glVertex2f(0.0, 1.0);
-	glTexCoord2f(1.0, 0.0); glVertex2f(1.0, 0.0);
-	glTexCoord2f(1.0, 1.0); glVertex2f(1.0, 1.0);
-	glEnd();
-	glFlush();
+	return [DrawLayer layer];
 }
 
-static int
-evkey(NSEvent *event)
+- (BOOL)wantsUpdateLayer
 {
-	NSString *s = [event charactersIgnoringModifiers];
-	int v = [s characterAtIndex:0];
+	return YES;
+}
+
+- (BOOL)isOpaque
+{
+	return YES;
+}
+
+- (BOOL)isFlipped
+{
+	return YES;
+}
+
+static uint
+evkey(uint v)
+{
 	switch(v){
 	case '\r': return '\n';
-	case '\b': return 127;
 	case 127: return '\b';
 	case NSUpArrowFunctionKey: return Kup;
 	case NSDownArrowFunctionKey: return Kdown;
@@ -294,61 +459,61 @@
 	case NSF10FunctionKey: return KF|10;
 	case NSF11FunctionKey: return KF|11;
 	case NSF12FunctionKey: return KF|12;
-	case NSF13FunctionKey: return 0;
-	case NSF14FunctionKey: return 0;
-	case NSF15FunctionKey: return 0;
-	case NSF16FunctionKey: return 0;
-	case NSF17FunctionKey: return 0;
-	case NSF18FunctionKey: return 0;
-	case NSF19FunctionKey: return 0;
-	case NSF20FunctionKey: return 0;
-	case NSF21FunctionKey: return 0;
-	case NSF22FunctionKey: return 0;
-	case NSF23FunctionKey: return 0;
-	case NSF24FunctionKey: return 0;
-	case NSF25FunctionKey: return 0;
-	case NSF26FunctionKey: return 0;
-	case NSF27FunctionKey: return 0;
-	case NSF28FunctionKey: return 0;
-	case NSF29FunctionKey: return 0;
-	case NSF30FunctionKey: return 0;
-	case NSF31FunctionKey: return 0;
-	case NSF32FunctionKey: return 0;
-	case NSF33FunctionKey: return 0;
-	case NSF34FunctionKey: return 0;
-	case NSF35FunctionKey: return 0;
 	case NSInsertFunctionKey: return Kins;
 	case NSDeleteFunctionKey: return Kdel;
 	case NSHomeFunctionKey: return Khome;
-	case NSBeginFunctionKey: return 0;
 	case NSEndFunctionKey: return Kend;
 	case NSPageUpFunctionKey: return Kpgup;
 	case NSPageDownFunctionKey: return Kpgdown;
-	case NSPrintScreenFunctionKey: return 0;
 	case NSScrollLockFunctionKey: return Kscroll;
-	case NSPauseFunctionKey: return 0;
-	case NSSysReqFunctionKey: return 0;
-	case NSBreakFunctionKey: return 0;
-	case NSResetFunctionKey: return 0;
-	case NSStopFunctionKey: return 0;
-	case NSMenuFunctionKey: return 0;
-	case NSUserFunctionKey: return 0;
-	case NSSystemFunctionKey: return 0;
-	case NSPrintFunctionKey: return 0;
-	case NSClearLineFunctionKey: return 0;
-	case NSClearDisplayFunctionKey: return 0;
-	case NSInsertLineFunctionKey: return 0;
-	case NSDeleteLineFunctionKey: return 0;
-	case NSInsertCharFunctionKey: return 0;
-	case NSDeleteCharFunctionKey: return 0;
-	case NSPrevFunctionKey: return 0;
-	case NSNextFunctionKey: return 0;
-	case NSSelectFunctionKey: return 0;
-	case NSExecuteFunctionKey: return 0;
-	case NSUndoFunctionKey: return 0;
-	case NSRedoFunctionKey: return 0;
-	case NSFindFunctionKey: return 0;
-	case NSHelpFunctionKey: return 0;
+	case NSBeginFunctionKey:
+	case NSF13FunctionKey:
+	case NSF14FunctionKey:
+	case NSF15FunctionKey:
+	case NSF16FunctionKey:
+	case NSF17FunctionKey:
+	case NSF18FunctionKey:
+	case NSF19FunctionKey:
+	case NSF20FunctionKey:
+	case NSF21FunctionKey:
+	case NSF22FunctionKey:
+	case NSF23FunctionKey:
+	case NSF24FunctionKey:
+	case NSF25FunctionKey:
+	case NSF26FunctionKey:
+	case NSF27FunctionKey:
+	case NSF28FunctionKey:
+	case NSF29FunctionKey:
+	case NSF30FunctionKey:
+	case NSF31FunctionKey:
+	case NSF32FunctionKey:
+	case NSF33FunctionKey:
+	case NSF34FunctionKey:
+	case NSF35FunctionKey:
+	case NSPrintScreenFunctionKey:
+	case NSPauseFunctionKey:
+	case NSSysReqFunctionKey:
+	case NSBreakFunctionKey:
+	case NSResetFunctionKey:
+	case NSStopFunctionKey:
+	case NSMenuFunctionKey:
+	case NSUserFunctionKey:
+	case NSSystemFunctionKey:
+	case NSPrintFunctionKey:
+	case NSClearLineFunctionKey:
+	case NSClearDisplayFunctionKey:
+	case NSInsertLineFunctionKey:
+	case NSDeleteLineFunctionKey:
+	case NSInsertCharFunctionKey:
+	case NSDeleteCharFunctionKey:
+	case NSPrevFunctionKey:
+	case NSNextFunctionKey:
+	case NSSelectFunctionKey:
+	case NSExecuteFunctionKey:
+	case NSUndoFunctionKey:
+	case NSRedoFunctionKey:
+	case NSFindFunctionKey:
+	case NSHelpFunctionKey:
 	case NSModeSwitchFunctionKey: return 0;
 	default: return v;
 	}
@@ -355,95 +520,105 @@
 }
 
 - (void)keyDown:(NSEvent*)event {
-	int m;
-
-	m = evkey(event);
-	if((event.modifierFlags & NSEventModifierFlagControl) != 0)
-		m &= 0x9f;
-	if(m != 0)
-		kbdkey(m, 1);
+	[self interpretKeyEvents:[NSArray arrayWithObject:event]];
+	[self resetLastInputRect];
 }
 
-- (void)keyUp:(NSEvent*)event {
-	int m;
+- (void)flagsChanged:(NSEvent*)event {
+	NSEventModifierFlags x;
+	NSUInteger u;
 
-	m = evkey(event);
-	if((event.modifierFlags & NSEventModifierFlagControl) != 0)
-		m &= 0x9f;
-	if(m != 0)
-		kbdkey(m, 0);
+	x = [event modifierFlags];
+	u = [NSEvent pressedMouseButtons];
+	u = (u&~6) | (u&4)>>1 | (u&2)<<1;
+	if((x & ~_mods & NSEventModifierFlagShift) != 0)
+		kbdkey(Kshift, 1);
+	if((x & ~_mods & NSEventModifierFlagControl) != 0){
+		if(u){
+			u |= 1;
+			[self sendmouse:u];
+			return;
+		}else
+			kbdkey(Kctl, 1);
+	}
+	if((x & ~_mods & NSEventModifierFlagOption) != 0){
+		if(u){
+			u |= 2;
+			[self sendmouse:u];
+			return;
+		}else
+			kbdkey(Kalt, 1);
+	}
+	if((x & NSEventModifierFlagCommand) != 0)
+		if(u){
+			u |= 4;
+			[self sendmouse:u];
+		}
+	if((x & ~_mods & NSEventModifierFlagCapsLock) != 0)
+		kbdkey(Kcaps, 1);
+	if((~x & _mods & NSEventModifierFlagShift) != 0)
+		kbdkey(Kshift, 0);
+	if((~x & _mods & NSEventModifierFlagControl) != 0)
+		kbdkey(Kctl, 0);
+	if((~x & _mods & NSEventModifierFlagOption) != 0){
+		kbdkey(Kalt, 0);
+		if(_breakcompose){
+			kbdkey(Kalt, 1);
+			kbdkey(Kalt, 0);
+			_breakcompose = NO;
+		}
+	}
+	if((~x & _mods & NSEventModifierFlagCapsLock) != 0)
+		kbdkey(Kcaps, 0);
+	_mods = x;
 }
 
-- (void)sendmouse:(NSUInteger)b
+- (void) clearMods {
+	if((_mods & NSEventModifierFlagShift) != 0){
+		kbdkey(Kshift, 0);
+		_mods ^= NSEventModifierFlagShift;
+	}
+	if((_mods & NSEventModifierFlagControl) != 0){
+		kbdkey(Kctl, 0);
+		_mods ^= NSEventModifierFlagControl;
+	}
+	if((_mods & NSEventModifierFlagOption) != 0){
+		kbdkey(Kalt, 0);
+		_mods ^= NSEventModifierFlagOption;
+	}
+}
+
+- (void) mouseevent:(NSEvent*)event
 {
 	NSPoint p;
 	Point q;
+	NSUInteger u;
+	NSEventModifierFlags m;
 
-	p = [self.window mouseLocationOutsideOfEventStream];
+	p = [self.window convertPointToBacking:[self.window mouseLocationOutsideOfEventStream]];
+	u = [NSEvent pressedMouseButtons];
 	q.x = p.x;
 	q.y = p.y;
 	if(!ptinrect(q, gscreen->clipr)) return;
-	absmousetrack(p.x, self.frame.size.height - p.y, b, ticks());
-}
-
-- (void)flagsChanged:(NSEvent*)event {
-	static NSEventModifierFlags omod;
-	NSEventModifierFlags m;
-	NSUInteger b;
-
-	m = [event modifierFlags];
-	b = [NSEvent pressedMouseButtons];
-	b = b & ~6 | b << 1 & 4 | b >> 1 & 2;
-	if(b){
-		if(m & ~omod & NSEventModifierFlagControl)
-			b |= 1;
-		if(m & ~omod & NSEventModifierFlagOption)
-			b |= 2;
-		if(m & ~omod & NSEventModifierFlagCommand)
-			b |= 4;
-		[self sendmouse:b];
-	}else{
-		if((m & ~omod & NSEventModifierFlagShift) != 0)
-			kbdkey(Kshift, 1);
-		if((m & ~omod & NSEventModifierFlagControl) != 0)
-			kbdkey(Kctl, 1);
-		if((m & ~omod & NSEventModifierFlagOption) != 0)
-			kbdkey(Kalt, 1);
-		if((m & ~omod & NSEventModifierFlagCapsLock) != 0)
-			kbdkey(Kcaps, 1);
-		if((~m & omod & NSEventModifierFlagShift) != 0)
-			kbdkey(Kshift, 0);
-		if((~m & omod & NSEventModifierFlagControl) != 0)
-			kbdkey(Kctl, 0);
-		if((~m & omod & NSEventModifierFlagOption) != 0)
-			kbdkey(Kalt, 0);
-		if((m & ~omod & NSEventModifierFlagCapsLock) != 0)
-			kbdkey(Kcaps, 0);
+	u = (u&~6) | (u&4)>>1 | (u&2)<<1;
+	if(u == 1){
+		m = [event modifierFlags];
+		if(m & NSEventModifierFlagOption){
+			_breakcompose = 1;
+			u = 2;
+		}else if(m & NSEventModifierFlagCommand)
+			u = 4;
 	}
-	omod = m;
+	absmousetrack(p.x, [self convertSizeToBacking:self.frame.size].height - p.y, u, ticks());
+	if(u && _lastInputRect.size.width && _lastInputRect.size.height)
+		[self resetLastInputRect];
 }
 
-- (void)mouseevent:(NSEvent*)event
+- (void) sendmouse:(NSUInteger)u
 {
-	NSUInteger b;
-	NSEventModifierFlags m;
-
-	b = [NSEvent pressedMouseButtons];
-	b = b & ~6 | b << 1 & 4 | b >> 1 & 2;
-	if(b==1){
-		m = [event modifierFlags];
-		if(m & NSEventModifierFlagOption)
-			b=2;
-		else if(m & NSEventModifierFlagCommand)
-			b=4;
-		else if(m & NSEventModifierFlagControl)
-			b=8;
-	}else if(b==4){
-		m = [event modifierFlags];
-		if(m & NSEventModifierFlagCommand)
-			b=8;
-	}
-	[self sendmouse:b];
+	mousetrack(0, 0, u, ticks());
+	if(u && _lastInputRect.size.width && _lastInputRect.size.height)
+		[self resetLastInputRect];
 }
 
 - (void) mouseDown:(NSEvent*)event { [self mouseevent:event]; }
@@ -457,38 +632,328 @@
 - (void) otherMouseDragged:(NSEvent*)event { [self mouseevent:event]; }
 - (void) otherMouseUp:(NSEvent*)event { [self mouseevent:event]; }
 
-- (void) scrollWheel:(NSEvent*)event {
-	mousetrack(0, 0, [event deltaY]>0 ? 8 : 16, ticks());
+- (void) scrollWheel:(NSEvent*)event{
+	NSInteger s = [event scrollingDeltaY];
+	if(s > 0)
+		[self sendmouse:8];
+	else if(s < 0)
+		[self sendmouse:16];
 }
 
-- (BOOL) acceptsFirstResponder {
-	return TRUE;
+- (void)magnifyWithEvent:(NSEvent*)e{
+	if(fabs([e magnification]) > 0.02)
+		[[self window] toggleFullScreen:nil];
 }
 
-- (void) reshape {
-	[super reshape];
-	winsize = self.frame.size;
-	NSOpenGLContext *ctxt = [NSOpenGLContext currentContext];
-	[[myview openGLContext] makeCurrentContext];
-	glBindTexture(GL_TEXTURE_2D, _tex);
-	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, self.frame.size.width, self.frame.size.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
-	if(ctxt == nil)
-		[NSOpenGLContext clearCurrentContext];
-	else
-		[ctxt makeCurrentContext];
-	if(gscreen != nil){
-		screenresize(Rect(0, 0, winsize.width, winsize.height));
-		flushmemscreen(gscreen->clipr);
+- (void)touchesBeganWithEvent:(NSEvent*)e
+{
+	_tapping = YES;
+	_tapFingers = [e touchesMatchingPhase:NSTouchPhaseTouching inView:nil].count;
+	_tapTime = ticks();
+}
+
+- (void)touchesMovedWithEvent:(NSEvent*)e
+{
+	_tapping = NO;
+}
+
+- (void)touchesEndedWithEvent:(NSEvent*)e
+{
+	if(_tapping
+		&& [e touchesMatchingPhase:NSTouchPhaseTouching inView:nil].count == 0
+		&& ticks() - _tapTime < 250){
+		switch(_tapFingers){
+		case 3:
+			[self sendmouse:2];
+			[self sendmouse:0];
+			break;
+		case 4:
+			[self sendmouse:2];
+			[self sendmouse:1];
+			[self sendmouse:0];
+			break;
+		}
+		_tapping = NO;
 	}
 }
 
-- (BOOL) acceptsMouseMovedEvents {
+- (void)touchesCancelledWithEvent:(NSEvent*)e
+{
+	_tapping = NO;
+}
+
+- (BOOL) acceptsFirstResponder
+{
 	return TRUE;
 }
 
-- (void)resetCursorRects {
+- (void) resetCursorRects
+{
 	[super resetCursorRects];
-	if (self.currentCursor != nil)
-		[self addCursorRect:self.bounds cursor:self.currentCursor];
+	lock(&cursor.lk);
+	[self addCursorRect:self.bounds cursor:currentCursor];
+	unlock(&cursor.lk);
 }
+
+- (void) reshape
+{
+	NSSize s = [self convertSizeToBacking:self.frame.size];
+	LOG(@"%g %g", s.width, s.height);
+	if(gscreen != nil){
+		screenresize(Rect(0, 0, s.width, s.height));
+	}
+}
+
+- (void)windowDidResize:(NSNotification *)notification
+{
+	if(![self inLiveResize])
+		[self reshape];
+}
+
+- (void)viewDidEndLiveResize
+{
+	LOG();
+	[super viewDidEndLiveResize];
+	[self reshape];
+}
+
+- (void)viewDidChangeBackingProperties
+{
+	LOG();
+	[super viewDidChangeBackingProperties];
+	[self reshape];
+}
+
+static void
+keystroke(Rune r)
+{
+	kbdkey(r, 1);
+	kbdkey(r, 0);
+}
+
+// conforms to protocol NSTextInputClient
+- (BOOL)hasMarkedText
+{
+	return _markedRange.location != NSNotFound;
+}
+- (NSRange)markedRange
+{
+	return _markedRange;
+}
+- (NSRange)selectedRange
+{
+	return _selectedRange;
+}
+- (void)setMarkedText:(id)string
+	selectedRange:(NSRange)sRange
+	replacementRange:(NSRange)rRange
+{
+	NSString *str;
+
+	[self clearInput];
+
+	if([string isKindOfClass:[NSAttributedString class]])
+		str = [string string];
+	else
+		str = string;
+
+	if(rRange.location == NSNotFound){
+		if(_markedRange.location != NSNotFound){
+			rRange = _markedRange;
+		}else{
+			rRange = _selectedRange;
+		}
+	}
+
+	if(str.length == 0){
+		[_tmpText deleteCharactersInRange:rRange];
+		[self unmarkText];
+	}else{
+		_markedRange = NSMakeRange(rRange.location, str.length);
+		[_tmpText replaceCharactersInRange:rRange withString:str];
+	}
+	_selectedRange.location = rRange.location + sRange.location;
+	_selectedRange.length = sRange.length;
+
+	if(_tmpText.length){
+		for(uint i = 0; i <= _tmpText.length; ++i){
+			if(i == _markedRange.location)
+				keystroke('[');
+			if(_selectedRange.length){
+				if(i == _selectedRange.location)
+					keystroke('{');
+				if(i == NSMaxRange(_selectedRange))
+					keystroke('}');
+				}
+			if(i == NSMaxRange(_markedRange))
+				keystroke(']');
+			if(i < _tmpText.length)
+				keystroke([_tmpText characterAtIndex:i]);
+		}
+		uint l = 1 + _tmpText.length - NSMaxRange(_selectedRange)
+			+ (_selectedRange.length > 0);
+		for(uint i = 0; i < l; ++i)
+			keystroke(Kleft);
+	}
+}
+- (void)unmarkText
+{
+	[_tmpText deleteCharactersInRange:NSMakeRange(0, [_tmpText length])];
+	_markedRange = NSMakeRange(NSNotFound, 0);
+	_selectedRange = NSMakeRange(0, 0);
+}
+- (NSArray<NSAttributedStringKey> *)validAttributesForMarkedText
+{
+	return @[];
+}
+- (NSAttributedString *)attributedSubstringForProposedRange:(NSRange)r
+	actualRange:(NSRangePointer)actualRange
+{
+	NSRange sr;
+	NSAttributedString *s;
+
+	sr = NSMakeRange(0, [_tmpText length]);
+	sr = NSIntersectionRange(sr, r);
+	if(actualRange)
+		*actualRange = sr;
+	if(sr.length)
+		s = [[NSAttributedString alloc]
+			initWithString:[_tmpText substringWithRange:sr]];
+	return s;
+}
+- (void)insertText:(id)s
+	replacementRange:(NSRange)r
+{
+	NSUInteger i;
+	NSUInteger len;
+
+	[self clearInput];
+
+	len = [s length];
+	for(i = 0; i < len; ++i)
+		keystroke([s characterAtIndex:i]);
+	[_tmpText deleteCharactersInRange:NSMakeRange(0, _tmpText.length)];
+	_markedRange = NSMakeRange(NSNotFound, 0);
+	_selectedRange = NSMakeRange(0, 0);
+}
+- (NSUInteger)characterIndexForPoint:(NSPoint)point
+{
+	return 0;
+}
+- (NSRect)firstRectForCharacterRange:(NSRange)r
+	actualRange:(NSRangePointer)actualRange
+{
+	if(actualRange)
+		*actualRange = r;
+	return [[self window] convertRectToScreen:_lastInputRect];
+}
+- (void)doCommandBySelector:(SEL)s
+{
+	NSEvent *e;
+	uint c, k;
+
+	e = [NSApp currentEvent];
+	c = [[e charactersIgnoringModifiers] characterAtIndex:0];
+	k = evkey(c);
+	if(k>0)
+		keystroke(k);
+}
+
+// Helper for managing input rect approximately
+- (void)resetLastInputRect
+{
+	_lastInputRect.origin.x = 0.0;
+	_lastInputRect.origin.y = 0.0;
+	_lastInputRect.size.width = 0.0;
+	_lastInputRect.size.height = 0.0;
+}
+
+- (void)enlargeLastInputRect:(NSRect)r
+{
+	r.origin.y = [self bounds].size.height - r.origin.y - r.size.height;
+	_lastInputRect = NSUnionRect(_lastInputRect, r);
+}
+
+- (void)clearInput
+{
+	if(_tmpText.length){
+		uint l = 1 + _tmpText.length - NSMaxRange(_selectedRange)
+			+ (_selectedRange.length > 0);
+		for(uint i = 0; i < l; ++i)
+			keystroke(Kright);
+		l = _tmpText.length+2+2*(_selectedRange.length > 0);
+		for(uint i = 0; i < l; ++i)
+			keystroke(Kbs);
+	}
+}
+@end
+
+@implementation DrawLayer
+{
+	id<MTLCommandQueue> _commandQueue;
+}
+
+- (id) init {
+	LOG();
+	self = [super init];
+	self.device = MTLCreateSystemDefaultDevice();
+	self.pixelFormat = MTLPixelFormatBGRA8Unorm;
+	self.framebufferOnly = YES;
+	self.opaque = YES;
+
+	// We use a default transparent layer on top of the CAMetalLayer.
+	// This seems to make fullscreen applications behave.
+	{
+		CALayer *stub = [CALayer layer];
+		stub.frame = CGRectMake(0, 0, 1, 1);
+		[stub setNeedsDisplay];
+		[self addSublayer:stub];
+	}
+
+	_commandQueue = [self.device newCommandQueue];
+
+	return self;
+}
+
+- (void) display
+{
+	id<MTLCommandBuffer> cbuf;
+	id<MTLBlitCommandEncoder> blit;
+
+	cbuf = [_commandQueue commandBuffer];
+
+@autoreleasepool{
+	id<CAMetalDrawable> drawable = [self nextDrawable];
+	if(!drawable){
+		LOG(@"display couldn't get drawable");
+		[self setNeedsDisplay];
+		return;
+	}
+
+	blit = [cbuf blitCommandEncoder];
+	[blit copyFromTexture:_texture
+		sourceSlice:0
+		sourceLevel:0
+		sourceOrigin:MTLOriginMake(0, 0, 0)
+		sourceSize:MTLSizeMake(_texture.width, _texture.height, _texture.depth)
+		toTexture:drawable.texture
+		destinationSlice:0
+		destinationLevel:0
+		destinationOrigin:MTLOriginMake(0, 0, 0)];
+	[blit endEncoding];
+
+	[cbuf presentDrawable:drawable];
+	drawable = nil;
+}
+	[cbuf addCompletedHandler:^(id<MTLCommandBuffer> cmdBuff){
+		if(cmdBuff.error){
+			NSLog(@"command buffer finished with error: %@",
+				cmdBuff.error.localizedDescription);
+		}else{
+			LOG(@"command buffer finished");
+		}
+	}];
+	[cbuf commit];
+}
+
 @end