Introduced a new Metal renderer implementation and a new example illustrating usage of Metal on macOS and iOS (partially addresses #1873)

examples/example_apple_metal/README.md

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+# iOS / OSX Metal example
+
+## Introduction
+
+This example shows how to render ImGui with Metal. It is based on the cross-platform game template provided with Xcode as of Xcode 9.
+

examples/example_apple_metal/Shared/AppDelegate.h

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+
+#import <TargetConditionals.h>
+
+#if TARGET_OS_IPHONE
+
+#import <UIKit/UIKit.h>
+
+@interface AppDelegate : UIResponder <UIApplicationDelegate>
+@property (strong, nonatomic) UIWindow *window;
+@end
+
+#else
+
+#import <Cocoa/Cocoa.h>
+
+@interface AppDelegate : NSObject <NSApplicationDelegate>
+@end
+
+#endif

examples/example_apple_metal/Shared/AppDelegate.m

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+
+#import "AppDelegate.h"
+
+@implementation AppDelegate
+
+#if TARGET_OS_OSX
+- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender {
+    return YES;
+}
+#endif
+
+@end

examples/example_apple_metal/Shared/Renderer.h

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+
+#import <MetalKit/MetalKit.h>
+
+@interface Renderer : NSObject <MTKViewDelegate>
+
+-(nonnull instancetype)initWithView:(nonnull MTKView *)view;
+
+@end
+

examples/example_apple_metal/Shared/Renderer.mm

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+
+#import "Renderer.h"
+#import <Metal/Metal.h>
+
+#include "imgui.h"
+#include "imgui_impl_metal.h"
+
+#if TARGET_OS_OSX
+#include "imgui_impl_osx.h"
+#endif
+
+@interface Renderer ()
+@property (nonatomic, strong) id <MTLDevice> device;
+@property (nonatomic, strong) id <MTLCommandQueue> commandQueue;
+@end
+
+@implementation Renderer
+
+-(nonnull instancetype)initWithView:(nonnull MTKView *)view;
+{
+    self = [super init];
+    if(self)
+    {
+        _device = view.device;
+        _commandQueue = [_device newCommandQueue];
+
+        IMGUI_CHECKVERSION();
+        ImGui::CreateContext();
+        (void)ImGui::GetIO();
+        
+        ImGui_ImplMetal_Init(_device);
+
+        ImGui::StyleColorsDark();
+    }
+
+    return self;
+}
+
+- (void)drawInMTKView:(MTKView *)view
+{
+    ImGuiIO &io = ImGui::GetIO();
+    io.DisplaySize.x = view.bounds.size.width;
+    io.DisplaySize.y = view.bounds.size.height;
+
+#if TARGET_OS_OSX
+    CGFloat framebufferScale = view.window.screen.backingScaleFactor ?: NSScreen.mainScreen.backingScaleFactor;
+#else
+    CGFloat framebufferScale = view.window.screen.scale ?: UIScreen.mainScreen.scale;
+#endif
+    io.DisplayFramebufferScale = ImVec2(framebufferScale, framebufferScale);
+
+    io.DeltaTime = 1 / float(view.preferredFramesPerSecond ?: 60);
+
+    id<MTLCommandBuffer> commandBuffer = [self.commandQueue commandBuffer];
+    
+    static bool show_demo_window = true;
+    static bool show_another_window = false;
+    static float clear_color[4] = { 0.28f, 0.36f, 0.5f, 1.0f };
+
+    MTLRenderPassDescriptor *renderPassDescriptor = view.currentRenderPassDescriptor;
+    if(renderPassDescriptor != nil)
+    {
+        renderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(clear_color[0], clear_color[1], clear_color[2], clear_color[3]);
+
+        // Here, you could do additional rendering work, including other passes as necessary.
+
+        id <MTLRenderCommandEncoder> renderEncoder = [commandBuffer renderCommandEncoderWithDescriptor:renderPassDescriptor];
+
+        [renderEncoder pushDebugGroup:@"Draw ImGui"];
+
+        ImGui_ImplMetal_NewFrame(renderPassDescriptor);
+#if TARGET_OS_OSX
+        ImGui_ImplOSX_NewFrame(view);
+#endif
+        ImGui::NewFrame();
+
+        {
+            static float f = 0.0f;
+            static int counter = 0;
+            ImGui::Text("Hello, world!");                           // Display some text (you can use a format string too)
+            ImGui::SliderFloat("float", &f, 0.0f, 1.0f);            // Edit 1 float using a slider from 0.0f to 1.0f
+            ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
+
+            ImGui::Checkbox("Demo Window", &show_demo_window);      // Edit bools storing our windows open/close state
+            ImGui::Checkbox("Another Window", &show_another_window);
+
+            if (ImGui::Button("Button"))                            // Buttons return true when clicked (NB: most widgets return true when edited/activated)
+                counter++;
+            ImGui::SameLine();
+            ImGui::Text("counter = %d", counter);
+
+            ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
+        }
+        
+        // 2. Show another simple window. In most cases you will use an explicit Begin/End pair to name your windows.
+        if (show_another_window)
+        {
+            ImGui::Begin("Another Window", &show_another_window);
+            ImGui::Text("Hello from another window!");
+            if (ImGui::Button("Close Me"))
+                show_another_window = false;
+            ImGui::End();
+        }
+        
+        // 3. Show the ImGui demo window. Most of the sample code is in ImGui::ShowDemoWindow(). Read its code to learn more about Dear ImGui!
+        if (show_demo_window)
+        {
+            // Normally user code doesn't need/want to call this because positions are saved in .ini file anyway.
+            // Here we just want to make the demo initial state a bit more friendly!
+            ImGui::SetNextWindowPos(ImVec2(650, 20), ImGuiCond_FirstUseEver);
+            ImGui::ShowDemoWindow(&show_demo_window);
+        }
+        
+        ImGui::Render();
+        ImDrawData *drawData = ImGui::GetDrawData();
+        ImGui_ImplMetal_RenderDrawData(drawData, commandBuffer, renderEncoder);
+        
+        [renderEncoder popDebugGroup];
+
+        [renderEncoder endEncoding];
+
+        [commandBuffer presentDrawable:view.currentDrawable];
+    }
+    
+    [commandBuffer commit];
+}
+
+- (void)mtkView:(MTKView *)view drawableSizeWillChange:(CGSize)size
+{
+}
+
+@end

examples/example_apple_metal/Shared/ViewController.h

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+
+#import <Metal/Metal.h>
+#import <MetalKit/MetalKit.h>
+#import "Renderer.h"
+
+#if TARGET_OS_IPHONE
+
+#import <UIKit/UIKit.h>
+
+@interface ViewController : UIViewController
+@end
+
+#else
+
+#import <Cocoa/Cocoa.h>
+
+@interface ViewController : NSViewController
+@end
+
+#endif

examples/example_apple_metal/Shared/ViewController.mm

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+
+#import "ViewController.h"
+#import "Renderer.h"
+#include "imgui.h"
+
+#if TARGET_OS_OSX
+#include "imgui_impl_osx.h"
+#endif
+
+@interface ViewController ()
+@property (nonatomic, readonly) MTKView *mtkView;
+@property (nonatomic, strong) Renderer *renderer;
+@end
+
+@implementation ViewController
+
+- (MTKView *)mtkView {
+    return (MTKView *)self.view;
+}
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+    
+    self.mtkView.device = MTLCreateSystemDefaultDevice();
+    
+    if (!self.mtkView.device) {
+        NSLog(@"Metal is not supported");
+        abort();
+    }
+
+    self.renderer = [[Renderer alloc] initWithView:self.mtkView];
+
+    [self.renderer mtkView:self.mtkView drawableSizeWillChange:self.mtkView.bounds.size];
+
+    self.mtkView.delegate = self.renderer;
+
+#if TARGET_OS_OSX
+    // Add a tracking area in order to receive mouse events whenever the mouse is within the bounds of our view
+    NSTrackingArea *trackingArea = [[NSTrackingArea alloc] initWithRect:NSZeroRect
+                                                                options:NSTrackingMouseMoved | NSTrackingInVisibleRect | NSTrackingActiveAlways
+                                                                  owner:self
+                                                               userInfo:nil];
+    [self.view addTrackingArea:trackingArea];
+    
+    // If we want to receive key events, we either need to be in the responder chain of the key view,
+    // or else we can install a local monitor. The consequence of this heavy-handed approach is that
+    // we receive events for all controls, not just ImGui widgets. If we had native controls in our
+    // window, we'd want to be much more careful than just ingesting the complete event stream, though
+    // we do make an effort to be good citizens by passing along events when ImGui doesn't want to capture.
+    NSEventMask eventMask = NSEventMaskKeyDown | NSEventMaskKeyUp | NSEventMaskFlagsChanged | NSEventTypeScrollWheel;
+    [NSEvent addLocalMonitorForEventsMatchingMask:eventMask handler:^NSEvent * _Nullable(NSEvent *event) {
+        BOOL wantsCapture = ImGui_ImplOSX_HandleEvent(event, self.view);
+        if (event.type == NSEventTypeKeyDown && wantsCapture) {
+            return nil;
+        } else {
+            return event;
+        }
+        
+    }];
+    
+    ImGui_ImplOSX_Init();
+#endif
+}
+
+#if TARGET_OS_OSX
+
+- (void)mouseMoved:(NSEvent *)event {
+    ImGui_ImplOSX_HandleEvent(event, self.view);
+}
+
+- (void)mouseDown:(NSEvent *)event {
+    ImGui_ImplOSX_HandleEvent(event, self.view);
+}
+
+- (void)mouseUp:(NSEvent *)event {
+    ImGui_ImplOSX_HandleEvent(event, self.view);
+}
+
+- (void)mouseDragged:(NSEvent *)event {
+    ImGui_ImplOSX_HandleEvent(event, self.view);
+}
+
+- (void)scrollWheel:(NSEvent *)event {
+    ImGui_ImplOSX_HandleEvent(event, self.view);
+}
+
+#elif TARGET_OS_IOS
+
+// This touch mapping is super cheesy/hacky. We treat any touch on the screen
+// as if it were a depressed left mouse button, and we don't bother handling
+// multitouch correctly at all. This causes the "cursor" to behave very erratically
+// when there are multiple active touches. But for demo purposes, single-touch
+// interaction actually works surprisingly well.
+- (void)updateIOWithTouchEvent:(UIEvent *)event {
+    UITouch *anyTouch = event.allTouches.anyObject;
+    CGPoint touchLocation = [anyTouch locationInView:self.view];
+    ImGuiIO &io = ImGui::GetIO();
+    io.MousePos = ImVec2(touchLocation.x, touchLocation.y);
+    
+    BOOL hasActiveTouch = NO;
+    for (UITouch *touch in event.allTouches) {
+        if (touch.phase != UITouchPhaseEnded && touch.phase != UITouchPhaseCancelled) {
+            hasActiveTouch = YES;
+            break;
+        }
+    }
+    io.MouseDown[0] = hasActiveTouch;
+}
+
+- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
+    [self updateIOWithTouchEvent:event];
+}
+
+- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
+    [self updateIOWithTouchEvent:event];
+}
+
+- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
+    [self updateIOWithTouchEvent:event];
+}
+
+- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
+    [self updateIOWithTouchEvent:event];
+}
+
+#endif
+
+@end
+

examples/example_apple_metal/Shared/main.m

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+
+#import <TargetConditionals.h>
+
+#if TARGET_OS_IPHONE
+
+#import <UIKit/UIKit.h>
+#import "AppDelegate.h"
+
+int main(int argc, char * argv[]) {
+    @autoreleasepool {
+        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+    }
+}
+
+#else
+
+#import <Cocoa/Cocoa.h>
+
+int main(int argc, const char * argv[]) {
+    return NSApplicationMain(argc, argv);
+}
+
+#endif

examples/example_apple_metal/example_apple_metal.xcodeproj/project.pbxproj

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+}

examples/example_apple_metal/iOS/Base.lproj/Main.storyboard

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14113" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BV1-FR-VrT">
+    <device id="retina4_7" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14088"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="tXr-a1-R10">
+            <objects>
+                <viewController id="BV1-FR-VrT" customClass="ViewController" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="3se-qz-xqx" customClass="MTKView">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <viewLayoutGuide key="safeArea" id="BKg-qs-eN0"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="SZV-WD-TEh" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

examples/example_apple_metal/iOS/Info-iOS.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>imgui</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>Launch Screen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+		<string>metal</string>
+	</array>
+	<key>UIRequiresFullScreen</key>
+	<true/>
+	<key>UIStatusBarHidden</key>
+	<true/>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

examples/example_apple_metal/iOS/Launch Screen.storyboard

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14269.14" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <device id="retina4_7" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14252.5"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <viewLayoutGuide key="safeArea" id="Bcu-3y-fUS"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>

examples/example_apple_metal/macOS/Base.lproj/Main.storyboard

@@ -0,0 +1,130 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.Cocoa.Storyboard.XIB" version="3.0" toolsVersion="14269.14" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" initialViewController="B8D-0N-5wS">
+    <dependencies>
+        <deployment identifier="macosx"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="14269.14"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--Application-->
+        <scene sceneID="JPo-4y-FX3">
+            <objects>
+                <application id="hnw-xV-0zn" sceneMemberID="viewController">
+                    <menu key="mainMenu" title="Main Menu" systemMenu="main" id="AYu-sK-qS6">
+                        <items>
+                            <menuItem title="ImGui" id="1Xt-HY-uBw">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="ImGui" systemMenu="apple" id="uQy-DD-JDr">
+                                    <items>
+                                        <menuItem title="Preferences…" keyEquivalent="," id="BOF-NM-1cW"/>
+                                        <menuItem isSeparatorItem="YES" id="wFC-TO-SCJ"/>
+                                        <menuItem title="Services" id="NMo-om-nkz">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <menu key="submenu" title="Services" systemMenu="services" id="hz9-B4-Xy5"/>
+                                        </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="4je-JR-u6R"/>
+                                        <menuItem title="Hide" keyEquivalent="h" id="Olw-nP-bQN">
+                                            <connections>
+                                                <action selector="hide:" target="Ady-hI-5gd" id="PnN-Uc-m68"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Hide Others" keyEquivalent="h" id="Vdr-fp-XzO">
+                                            <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
+                                            <connections>
+                                                <action selector="hideOtherApplications:" target="Ady-hI-5gd" id="VT4-aY-XCT"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Show All" id="Kd2-mp-pUS">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="unhideAllApplications:" target="Ady-hI-5gd" id="Dhg-Le-xox"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="kCx-OE-vgT"/>
+                                        <menuItem title="Quit" keyEquivalent="q" id="4sb-4s-VLi">
+                                            <connections>
+                                                <action selector="terminate:" target="Ady-hI-5gd" id="Te7-pn-YzF"/>
+                                            </connections>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                            <menuItem title="View" id="H8h-7b-M4v">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="View" id="HyV-fh-RgO">
+                                    <items>
+                                        <menuItem title="Enter Full Screen" keyEquivalent="f" id="4J7-dP-txa">
+                                            <modifierMask key="keyEquivalentModifierMask" control="YES" command="YES"/>
+                                            <connections>
+                                                <action selector="toggleFullScreen:" target="Ady-hI-5gd" id="dU3-MA-1Rq"/>
+                                            </connections>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                            <menuItem title="Window" id="aUF-d1-5bR">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="Window" systemMenu="window" id="Td7-aD-5lo">
+                                    <items>
+                                        <menuItem title="Minimize" keyEquivalent="m" id="OY7-WF-poV">
+                                            <connections>
+                                                <action selector="performMiniaturize:" target="Ady-hI-5gd" id="VwT-WD-YPe"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Zoom" id="R4o-n2-Eq4">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="performZoom:" target="Ady-hI-5gd" id="DIl-cC-cCs"/>
+                                            </connections>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                        </items>
+                    </menu>
+                    <connections>
+                        <outlet property="delegate" destination="Voe-Tx-rLC" id="PrD-fu-P6m"/>
+                    </connections>
+                </application>
+                <customObject id="Voe-Tx-rLC" customClass="AppDelegate"/>
+                <customObject id="YLy-65-1bz" customClass="NSFontManager"/>
+                <customObject id="Ady-hI-5gd" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="75" y="0.0"/>
+        </scene>
+        <!--Window Controller-->
+        <scene sceneID="R2V-B0-nI4">
+            <objects>
+                <windowController id="B8D-0N-5wS" sceneMemberID="viewController">
+                    <window key="window" title="ImGui" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" animationBehavior="default" titleVisibility="hidden" id="IQv-IB-iLA">
+                        <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="196" y="240" width="480" height="270"/>
+                        <rect key="screenRect" x="0.0" y="0.0" width="1680" height="1027"/>
+                        <connections>
+                            <outlet property="delegate" destination="B8D-0N-5wS" id="CyC-Pq-WbN"/>
+                        </connections>
+                    </window>
+                    <connections>
+                        <segue destination="XfG-lQ-9wD" kind="relationship" relationship="window.shadowedContentViewController" id="cq2-FE-JQM"/>
+                    </connections>
+                </windowController>
+                <customObject id="Oky-zY-oP4" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-128" y="390"/>
+        </scene>
+        <!--View Controller-->
+        <scene sceneID="hIz-AP-VOD">
+            <objects>
+                <viewController id="XfG-lQ-9wD" customClass="ViewController" sceneMemberID="viewController">
+                    <view key="view" wantsLayer="YES" id="m2S-Jp-Qdl" customClass="MTKView">
+                        <rect key="frame" x="0.0" y="0.0" width="1280" height="720"/>
+                        <autoresizingMask key="autoresizingMask"/>
+                    </view>
+                </viewController>
+                <customObject id="rPt-NT-nkU" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="205" y="1032"/>
+        </scene>
+    </scenes>
+</document>

examples/example_apple_metal/macOS/Info-macOS.plist

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIconFile</key>
+	<string></string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>imgui</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>$(MACOSX_DEPLOYMENT_TARGET)</string>
+	<key>NSHumanReadableCopyright</key>
+	<string>Copyright © 2018 Warren Moore. All rights reserved.</string>
+	<key>NSMainStoryboardFile</key>
+	<string>Main</string>
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+</dict>
+</plist>

examples/imgui_impl_metal.h

@@ -0,0 +1,25 @@
+// ImGui Renderer for: Metal
+// This needs to be used along with a Platform Binding (e.g. OSX)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'MTLTexture' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+
+// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
+// If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp.
+// https://github.com/ocornut/imgui
+
+@class MTLRenderPassDescriptor;
+@protocol MTLDevice, MTLCommandBuffer, MTLRenderCommandEncoder;
+
+IMGUI_IMPL_API bool ImGui_ImplMetal_Init(id<MTLDevice> device);
+IMGUI_IMPL_API void ImGui_ImplMetal_Shutdown();
+IMGUI_IMPL_API void ImGui_ImplMetal_NewFrame(MTLRenderPassDescriptor *renderPassDescriptor);
+IMGUI_IMPL_API void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data,
+                                                   id<MTLCommandBuffer> commandBuffer,
+                                                   id<MTLRenderCommandEncoder> commandEncoder);
+
+// Called by Init/NewFrame/Shutdown
+IMGUI_IMPL_API bool ImGui_ImplMetal_CreateFontsTexture(id<MTLDevice> device);
+IMGUI_IMPL_API void ImGui_ImplMetal_DestroyFontsTexture();
+IMGUI_IMPL_API bool ImGui_ImplMetal_CreateDeviceObjects(id<MTLDevice> device);
+IMGUI_IMPL_API void ImGui_ImplMetal_DestroyDeviceObjects();

examples/imgui_impl_metal.mm

@@ -0,0 +1,490 @@
+// ImGui Renderer for: Metal
+// This needs to be used along with a Platform Binding (e.g. OSX)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'MTLTexture' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+
+// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
+// If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp.
+// https://github.com/ocornut/imgui
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2018-07-05: Metal: Added new Metal backend implementation
+
+#include "imgui.h"
+#include "imgui_impl_metal.h"
+
+#import <Metal/Metal.h>
+#import <QuartzCore/CAMetalLayer.h>
+#import <simd/simd.h>
+
+#pragma mark - Support classes
+
+// A wrapper around a MTLBuffer object that knows the last time it was reused
+@interface MetalBuffer : NSObject
+@property (nonatomic, strong) id<MTLBuffer> buffer;
+@property (nonatomic, assign) NSTimeInterval lastReuseTime;
+- (instancetype)initWithBuffer:(id<MTLBuffer>)buffer;
+@end
+
+// An object that encapsulates the data necessary to uniquely identify a
+// render pipeline state. These are used as cache keys.
+@interface FramebufferDescriptor : NSObject<NSCopying>
+@property (nonatomic, assign) unsigned long sampleCount;
+@property (nonatomic, assign) MTLPixelFormat colorPixelFormat;
+@property (nonatomic, assign) MTLPixelFormat depthPixelFormat;
+@property (nonatomic, assign) MTLPixelFormat stencilPixelFormat;
+- (instancetype)initWithRenderPassDescriptor:(MTLRenderPassDescriptor *)renderPassDescriptor;
+@end
+
+// A singleton that stores long-lived objects that are needed by the Metal
+// renderer backend. Stores the render pipeline state cache and the default
+// font texture, and manages the reusable buffer cache.
+@interface MetalContext : NSObject
+@property (nonatomic, strong) id<MTLDepthStencilState> depthStencilState;
+@property (nonatomic, strong) FramebufferDescriptor *framebufferDescriptor; // framebuffer descriptor for current frame; transient
+@property (nonatomic, strong) NSMutableDictionary *renderPipelineStateCache; // pipeline cache; keyed on framebuffer descriptors
+@property (nonatomic, strong, nullable) id<MTLTexture> fontTexture;
+@property (nonatomic, strong) NSMutableArray<MetalBuffer *> *bufferCache;
+@property (nonatomic, assign) NSTimeInterval lastBufferCachePurge;
+- (void)makeDeviceObjectsWithDevice:(id<MTLDevice>)device;
+- (void)makeFontTextureWithDevice:(id<MTLDevice>)device;
+- (MetalBuffer *)dequeueReusableBufferOfLength:(NSUInteger)length device:(id<MTLDevice>)device;
+- (void)enqueueReusableBuffer:(MetalBuffer *)buffer;
+- (id<MTLRenderPipelineState>)renderPipelineStateForFrameAndDevice:(id<MTLDevice>)device;
+- (void)emptyRenderPipelineStateCache;
+- (void)renderDrawData:(ImDrawData *)drawData
+         commandBuffer:(id<MTLCommandBuffer>)commandBuffer
+        commandEncoder:(id<MTLRenderCommandEncoder>)commandEncoder;
+@end
+
+static MetalContext *g_sharedMetalContext = nil;
+
+#pragma mark - ImGui API implementation
+
+bool ImGui_ImplMetal_Init(id<MTLDevice> device)
+{
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        g_sharedMetalContext = [[MetalContext alloc] init];
+    });
+    
+    ImGui_ImplMetal_CreateDeviceObjects(device);
+
+    return true;
+}
+
+void ImGui_ImplMetal_Shutdown()
+{
+    ImGui_ImplMetal_DestroyDeviceObjects();
+}
+
+void ImGui_ImplMetal_NewFrame(MTLRenderPassDescriptor *renderPassDescriptor)
+{
+    IM_ASSERT(g_sharedMetalContext != nil && "No Metal context. Did you call ImGui_ImplMetal_Init?");
+
+    g_sharedMetalContext.framebufferDescriptor = [[FramebufferDescriptor alloc] initWithRenderPassDescriptor:renderPassDescriptor];
+}
+
+// Metal Render function.
+void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data, id<MTLCommandBuffer> commandBuffer, id<MTLRenderCommandEncoder> commandEncoder)
+{
+    [g_sharedMetalContext renderDrawData:draw_data commandBuffer:commandBuffer commandEncoder:commandEncoder];
+}
+
+bool ImGui_ImplMetal_CreateFontsTexture(id<MTLDevice> device)
+{
+    [g_sharedMetalContext makeFontTextureWithDevice:device];
+    
+    ImGuiIO& io = ImGui::GetIO();
+    io.Fonts->TexID = (__bridge void *)g_sharedMetalContext.fontTexture;
+
+    return (g_sharedMetalContext.fontTexture != nil);
+}
+
+void ImGui_ImplMetal_DestroyFontsTexture()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    g_sharedMetalContext.fontTexture = nil;
+    io.Fonts->TexID = nullptr;
+}
+
+bool ImGui_ImplMetal_CreateDeviceObjects(id<MTLDevice> device)
+{
+    [g_sharedMetalContext makeDeviceObjectsWithDevice:device];
+
+    ImGui_ImplMetal_CreateFontsTexture(device);
+
+    return true;
+}
+
+void ImGui_ImplMetal_DestroyDeviceObjects()
+{
+    ImGui_ImplMetal_DestroyFontsTexture();
+    [g_sharedMetalContext emptyRenderPipelineStateCache];
+}
+
+#pragma mark - MetalBuffer implementation
+
+@implementation MetalBuffer
+- (instancetype)initWithBuffer:(id<MTLBuffer>)buffer {
+    if ((self = [super init])) {
+        _buffer = buffer;
+        _lastReuseTime = [NSDate date].timeIntervalSince1970;
+    }
+    return self;
+}
+@end
+
+#pragma mark - FramebufferDescriptor implementation
+
+@implementation FramebufferDescriptor
+- (instancetype)initWithRenderPassDescriptor:(MTLRenderPassDescriptor *)renderPassDescriptor {
+    if ((self = [super init])) {
+        _sampleCount = renderPassDescriptor.colorAttachments[0].texture.sampleCount;
+        _colorPixelFormat = renderPassDescriptor.colorAttachments[0].texture.pixelFormat;
+        _depthPixelFormat = renderPassDescriptor.depthAttachment.texture.pixelFormat;
+        _stencilPixelFormat = renderPassDescriptor.stencilAttachment.texture.pixelFormat;
+    }
+    return self;
+}
+
+- (nonnull id)copyWithZone:(nullable NSZone *)zone {
+    FramebufferDescriptor *copy = [[FramebufferDescriptor allocWithZone:zone] init];
+    copy.sampleCount = self.sampleCount;
+    copy.colorPixelFormat = self.colorPixelFormat;
+    copy.depthPixelFormat = self.depthPixelFormat;
+    copy.stencilPixelFormat = self.stencilPixelFormat;
+    return copy;
+}
+
+- (NSUInteger)hash {
+    NSUInteger sc = _sampleCount & 0x3;
+    NSUInteger cf = _colorPixelFormat & 0x3FF;
+    NSUInteger df = _depthPixelFormat & 0x3FF;
+    NSUInteger sf = _stencilPixelFormat & 0x3FF;
+    NSUInteger hash = (sf << 22) | (df << 12) | (cf << 2) | sc;
+    return hash;
+}
+
+- (BOOL)isEqual:(id)object {
+    FramebufferDescriptor *other = object;
+    if (![other isKindOfClass:[FramebufferDescriptor class]]) {
+        return NO;
+    }
+    return other.sampleCount        == self.sampleCount      &&
+    other.colorPixelFormat   == self.colorPixelFormat &&
+    other.depthPixelFormat   == self.depthPixelFormat &&
+    other.stencilPixelFormat == self.stencilPixelFormat;
+}
+
+@end
+
+#pragma mark - MetalContext implementation
+
+@implementation MetalContext
+- (instancetype)init {
+    if ((self = [super init])) {
+        _renderPipelineStateCache = [NSMutableDictionary dictionary];
+        _bufferCache = [NSMutableArray array];
+        _lastBufferCachePurge = [NSDate date].timeIntervalSince1970;
+    }
+    return self;
+}
+
+- (void)makeDeviceObjectsWithDevice:(id<MTLDevice>)device {
+    MTLDepthStencilDescriptor *depthStencilDescriptor = [[MTLDepthStencilDescriptor alloc] init];
+    depthStencilDescriptor.depthWriteEnabled = NO;
+    depthStencilDescriptor.depthCompareFunction = MTLCompareFunctionAlways;
+    self.depthStencilState = [device newDepthStencilStateWithDescriptor:depthStencilDescriptor];
+}
+
+- (void)makeFontTextureWithDevice:(id<MTLDevice>)device {
+    ImGuiIO &io = ImGui::GetIO();
+    unsigned char* pixels;
+    int width, height;
+    io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
+    MTLTextureDescriptor *textureDescriptor = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:MTLPixelFormatRGBA8Unorm
+                                                                                                 width:width
+                                                                                                height:height
+                                                                                             mipmapped:NO];
+    textureDescriptor.usage = MTLTextureUsageShaderRead;
+#if TARGET_OS_OSX
+    textureDescriptor.storageMode = MTLStorageModeManaged;
+#else
+    textureDescriptor.storageMode = MTLStorageModeShared;
+#endif
+    id <MTLTexture> texture = [device newTextureWithDescriptor:textureDescriptor];
+    [texture replaceRegion:MTLRegionMake2D(0, 0, width, height) mipmapLevel:0 withBytes:pixels bytesPerRow:width * 4];
+    self.fontTexture = texture;
+}
+
+- (MetalBuffer *)dequeueReusableBufferOfLength:(NSUInteger)length device:(id<MTLDevice>)device {
+    NSTimeInterval now = [NSDate date].timeIntervalSince1970;
+    
+    // Purge old buffers that haven't been useful for a while
+    if (now - self.lastBufferCachePurge > 1.0) {
+        NSMutableArray *survivors = [NSMutableArray array];
+        for (MetalBuffer *candidate in self.bufferCache) {
+            if (candidate.lastReuseTime > self.lastBufferCachePurge) {
+                [survivors addObject:candidate];
+            }
+        }
+        self.bufferCache = [survivors mutableCopy];
+        self.lastBufferCachePurge = now;
+    }
+    
+    // See if we have a buffer we can reuse
+    MetalBuffer *bestCandidate = nil;
+    for (MetalBuffer *candidate in self.bufferCache) {
+        if (candidate.buffer.length >= length && (bestCandidate == nil || bestCandidate.lastReuseTime > candidate.lastReuseTime)) {
+            bestCandidate = candidate;
+        }
+    }
+    
+    if (bestCandidate != nil) {
+        [self.bufferCache removeObject:bestCandidate];
+        bestCandidate.lastReuseTime = now;
+        return bestCandidate;
+    }
+    
+    // No luck; make a new buffer
+    id<MTLBuffer> backing = [device newBufferWithLength:length options:MTLResourceStorageModeShared];
+    return [[MetalBuffer alloc] initWithBuffer:backing];
+}
+
+- (void)enqueueReusableBuffer:(MetalBuffer *)buffer {
+    [self.bufferCache addObject:buffer];
+}
+
+- (_Nullable id<MTLRenderPipelineState>)renderPipelineStateForFrameAndDevice:(id<MTLDevice>)device {
+    // Try to retrieve a render pipeline state that is compatible with the framebuffer config for this frame
+    // Thie hit rate for this cache should be very near 100%.
+    id<MTLRenderPipelineState> renderPipelineState = self.renderPipelineStateCache[self.framebufferDescriptor];
+    
+    if (renderPipelineState == nil) {
+        // No luck; make a new render pipeline state
+        renderPipelineState = [self _renderPipelineStateForFramebufferDescriptor:self.framebufferDescriptor device:device];
+        // Cache render pipeline state for later reuse
+        self.renderPipelineStateCache[self.framebufferDescriptor] = renderPipelineState;
+    }
+    
+    return renderPipelineState;
+}
+
+- (id<MTLRenderPipelineState>)_renderPipelineStateForFramebufferDescriptor:(FramebufferDescriptor *)descriptor device:(id<MTLDevice>)device
+{
+    NSError *error = nil;
+    
+    NSString *shaderSource = @""
+    "#include <metal_stdlib>\n"
+    "using namespace metal;\n"
+    "\n"
+    "struct Uniforms {\n"
+    "    float4x4 projectionMatrix;\n"
+    "};\n"
+    "\n"
+    "struct VertexIn {\n"
+    "    float2 position  [[attribute(0)]];\n"
+    "    float2 texCoords [[attribute(1)]];\n"
+    "    uchar4 color     [[attribute(2)]];\n"
+    "};\n"
+    "\n"
+    "struct VertexOut {\n"
+    "    float4 position [[position]];\n"
+    "    float2 texCoords;\n"
+    "    float4 color;\n"
+    "};\n"
+    "\n"
+    "vertex VertexOut vertex_main(VertexIn in                 [[stage_in]],\n"
+    "                             constant Uniforms &uniforms [[buffer(1)]]) {\n"
+    "    VertexOut out;\n"
+    "    out.position = uniforms.projectionMatrix * float4(in.position, 0, 1);\n"
+    "    out.texCoords = in.texCoords;\n"
+    "    out.color = float4(in.color) / float4(255.0);\n"
+    "    return out;\n"
+    "}\n"
+    "\n"
+    "fragment half4 fragment_main(VertexOut in [[stage_in]],\n"
+    "                             texture2d<half, access::sample> texture [[texture(0)]]) {\n"
+    "    constexpr sampler linearSampler(coord::normalized, min_filter::linear, mag_filter::linear, mip_filter::linear);\n"
+    "    half4 texColor = texture.sample(linearSampler, in.texCoords);\n"
+    "    return half4(in.color) * texColor;\n"
+    "}\n";
+    
+    id<MTLLibrary> library = [device newLibraryWithSource:shaderSource options:nil error:&error];
+    if (library == nil) {
+        NSLog(@"Error: failed to create Metal library: %@", error);
+        return nil;
+    }
+    
+    id<MTLFunction> vertexFunction = [library newFunctionWithName:@"vertex_main"];
+    id<MTLFunction> fragmentFunction = [library newFunctionWithName:@"fragment_main"];
+    
+    if (vertexFunction == nil || fragmentFunction == nil) {
+        NSLog(@"Error: failed to find Metal shader functions in library: %@", error);
+        return nil;
+    }
+    
+    MTLVertexDescriptor *vertexDescriptor = [MTLVertexDescriptor vertexDescriptor];
+    vertexDescriptor.attributes[0].offset = IM_OFFSETOF(ImDrawVert, pos);
+    vertexDescriptor.attributes[0].format = MTLVertexFormatFloat2; // position
+    vertexDescriptor.attributes[0].bufferIndex = 0;
+    vertexDescriptor.attributes[1].offset = IM_OFFSETOF(ImDrawVert, uv);
+    vertexDescriptor.attributes[1].format = MTLVertexFormatFloat2; // texCoords
+    vertexDescriptor.attributes[1].bufferIndex = 0;
+    vertexDescriptor.attributes[2].offset = IM_OFFSETOF(ImDrawVert, col);
+    vertexDescriptor.attributes[2].format = MTLVertexFormatUChar4; // color
+    vertexDescriptor.attributes[2].bufferIndex = 0;
+    vertexDescriptor.layouts[0].stepRate = 1;
+    vertexDescriptor.layouts[0].stepFunction = MTLVertexStepFunctionPerVertex;
+    vertexDescriptor.layouts[0].stride = sizeof(ImDrawVert);
+    
+    MTLRenderPipelineDescriptor *pipelineDescriptor = [[MTLRenderPipelineDescriptor alloc] init];
+    pipelineDescriptor.vertexFunction = vertexFunction;
+    pipelineDescriptor.fragmentFunction = fragmentFunction;
+    pipelineDescriptor.vertexDescriptor = vertexDescriptor;
+    pipelineDescriptor.sampleCount = self.framebufferDescriptor.sampleCount;
+    pipelineDescriptor.colorAttachments[0].pixelFormat = self.framebufferDescriptor.colorPixelFormat;
+    pipelineDescriptor.colorAttachments[0].blendingEnabled = YES;
+    pipelineDescriptor.colorAttachments[0].rgbBlendOperation = MTLBlendOperationAdd;
+    pipelineDescriptor.colorAttachments[0].alphaBlendOperation = MTLBlendOperationAdd;
+    pipelineDescriptor.colorAttachments[0].sourceRGBBlendFactor = MTLBlendFactorSourceAlpha;
+    pipelineDescriptor.colorAttachments[0].sourceAlphaBlendFactor = MTLBlendFactorSourceAlpha;
+    pipelineDescriptor.colorAttachments[0].destinationRGBBlendFactor = MTLBlendFactorOneMinusSourceAlpha;
+    pipelineDescriptor.colorAttachments[0].destinationAlphaBlendFactor = MTLBlendFactorOneMinusSourceAlpha;
+    pipelineDescriptor.depthAttachmentPixelFormat = self.framebufferDescriptor.depthPixelFormat;
+    pipelineDescriptor.stencilAttachmentPixelFormat = self.framebufferDescriptor.stencilPixelFormat;
+    
+    id<MTLRenderPipelineState> renderPipelineState = [device newRenderPipelineStateWithDescriptor:pipelineDescriptor error:&error];
+    if (error != nil) {
+        NSLog(@"Error: failed to create Metal pipeline state: %@", error);
+    }
+    
+    return renderPipelineState;
+}
+
+- (void)emptyRenderPipelineStateCache {
+    [self.renderPipelineStateCache removeAllObjects];
+}
+
+- (void)renderDrawData:(ImDrawData *)drawData
+         commandBuffer:(id<MTLCommandBuffer>)commandBuffer
+        commandEncoder:(id<MTLRenderCommandEncoder>)commandEncoder
+{
+    // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
+    ImGuiIO &io = ImGui::GetIO();
+    int fb_width = (int)(drawData->DisplaySize.x * io.DisplayFramebufferScale.x);
+    int fb_height = (int)(drawData->DisplaySize.y * io.DisplayFramebufferScale.y);
+    if (fb_width <= 0 || fb_height <= 0 || drawData->CmdListsCount == 0)
+        return;
+    drawData->ScaleClipRects(io.DisplayFramebufferScale);
+    
+    [commandEncoder setCullMode:MTLCullModeNone];
+    [commandEncoder setDepthStencilState:g_sharedMetalContext.depthStencilState];
+    
+    // Setup viewport, orthographic projection matrix
+    // Our visible imgui space lies from draw_data->DisplayPps (top left) to
+    // draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayMin is typically (0,0) for single viewport apps.
+    MTLViewport viewport = { .originX = 0.0,
+        .originY = 0.0,
+        .width = double(fb_width),
+        .height = double(fb_height),
+        .znear = 0.0,
+        .zfar = 1.0 };
+    [commandEncoder setViewport:viewport];
+    float L = drawData->DisplayPos.x;
+    float R = drawData->DisplayPos.x + drawData->DisplaySize.x;
+    float T = drawData->DisplayPos.y;
+    float B = drawData->DisplayPos.y + drawData->DisplaySize.y;
+    float N = viewport.znear;
+    float F = viewport.zfar;
+    const float ortho_projection[4][4] =
+    {
+        { 2.0f/(R-L),   0.0f,           0.0f,   0.0f },
+        { 0.0f,         2.0f/(T-B),     0.0f,   0.0f },
+        { 0.0f,         0.0f,        1/(F-N),   0.0f },
+        { (R+L)/(L-R),  (T+B)/(B-T), N/(F-N),   1.0f },
+    };
+    
+    [commandEncoder setVertexBytes:&ortho_projection length:sizeof(ortho_projection) atIndex:1];
+    
+    size_t vertexBufferLength = 0;
+    size_t indexBufferLength = 0;
+    for (int n = 0; n < drawData->CmdListsCount; n++) {
+        const ImDrawList* cmd_list = drawData->CmdLists[n];
+        vertexBufferLength += cmd_list->VtxBuffer.Size * sizeof(ImDrawVert);
+        indexBufferLength += cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx);
+    }
+    
+    MetalBuffer *vertexBuffer = [self dequeueReusableBufferOfLength:vertexBufferLength device:commandBuffer.device];
+    MetalBuffer *indexBuffer = [self dequeueReusableBufferOfLength:indexBufferLength device:commandBuffer.device];
+    
+    id<MTLRenderPipelineState> renderPipelineState = [self renderPipelineStateForFrameAndDevice:commandBuffer.device];
+    [commandEncoder setRenderPipelineState:renderPipelineState];
+    
+    [commandEncoder setVertexBuffer:vertexBuffer.buffer offset:0 atIndex:0];
+    
+    size_t vertexBufferOffset = 0;
+    size_t indexBufferOffset = 0;
+    ImVec2 pos = drawData->DisplayPos;
+    for (int n = 0; n < drawData->CmdListsCount; n++)
+    {
+        const ImDrawList* cmd_list = drawData->CmdLists[n];
+        ImDrawIdx idx_buffer_offset = 0;
+        
+        memcpy((char *)vertexBuffer.buffer.contents + vertexBufferOffset, cmd_list->VtxBuffer.Data, cmd_list->VtxBuffer.Size * sizeof(ImDrawVert));
+        memcpy((char *)indexBuffer.buffer.contents + indexBufferOffset, cmd_list->IdxBuffer.Data, cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx));
+        
+        [commandEncoder setVertexBufferOffset:vertexBufferOffset atIndex:0];
+        
+        for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
+        {
+            const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
+            if (pcmd->UserCallback)
+            {
+                // User callback (registered via ImDrawList::AddCallback)
+                pcmd->UserCallback(cmd_list, pcmd);
+            }
+            else
+            {
+                ImVec4 clip_rect = ImVec4(pcmd->ClipRect.x - pos.x, pcmd->ClipRect.y - pos.y, pcmd->ClipRect.z - pos.x, pcmd->ClipRect.w - pos.y);
+                if (clip_rect.x < fb_width && clip_rect.y < fb_height && clip_rect.z >= 0.0f && clip_rect.w >= 0.0f)
+                {
+                    // Apply scissor/clipping rectangle
+                    MTLScissorRect scissorRect = { .x = NSUInteger(clip_rect.x),
+                        .y = NSUInteger(clip_rect.y),
+                        .width = NSUInteger(clip_rect.z - clip_rect.x),
+                        .height = NSUInteger(clip_rect.w - clip_rect.y) };
+                    [commandEncoder setScissorRect:scissorRect];
+                    
+                    
+                    // Bind texture, Draw
+                    if (pcmd->TextureId != NULL) {
+                        [commandEncoder setFragmentTexture:(__bridge id<MTLTexture>)(pcmd->TextureId) atIndex:0];
+                    }
+                    [commandEncoder drawIndexedPrimitives:MTLPrimitiveTypeTriangle
+                                               indexCount:pcmd->ElemCount
+                                                indexType:sizeof(ImDrawIdx) == 2 ? MTLIndexTypeUInt16 : MTLIndexTypeUInt32
+                                              indexBuffer:indexBuffer.buffer
+                                        indexBufferOffset:indexBufferOffset + idx_buffer_offset];
+                }
+            }
+            idx_buffer_offset += pcmd->ElemCount * sizeof(ImDrawIdx);
+        }
+        
+        vertexBufferOffset += cmd_list->VtxBuffer.Size * sizeof(ImDrawVert);
+        indexBufferOffset += cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx);
+    }
+    
+    __weak id weakSelf = self;
+    [commandBuffer addCompletedHandler:^(id<MTLCommandBuffer>) {
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [weakSelf enqueueReusableBuffer:vertexBuffer];
+            [weakSelf enqueueReusableBuffer:indexBuffer];
+        });
+    }];
+}
+
+@end

examples/imgui_impl_osx.h

@@ -2,9 +2,8 @@
 // This needs to be used along with a Renderer (e.g. OpenGL2, OpenGL3, Vulkan, Metal..)
 
 @class NSEvent;
-@class NSVew;
+@class NSView;
 
-// FIXME-OSX: Try replacing with NSView
 IMGUI_API bool        ImGui_ImplOSX_Init();
 IMGUI_API void        ImGui_ImplOSX_Shutdown();
 IMGUI_API void        ImGui_ImplOSX_NewFrame(NSView *_Nonnull view);