imgui

main.mm (13395B)

---

 // Dear ImGui: standalone example application for OSX + Metal.
 // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
 // Read online: https://github.com/ocornut/imgui/tree/master/docs
 
 #import <Foundation/Foundation.h>
 
 #if TARGET_OS_OSX
 #import <Cocoa/Cocoa.h>
 #else
 #import <UIKit/UIKit.h>
 #endif
 
 #import <Metal/Metal.h>
 #import <MetalKit/MetalKit.h>
 
 #include "imgui.h"
 #include "imgui_impl_metal.h"
 
 #if TARGET_OS_OSX
 #include "imgui_impl_osx.h"
 
 @interface ViewController : NSViewController
 @end
 #else
 @interface ViewController : UIViewController
 @end
 #endif
 
 @interface ViewController () <MTKViewDelegate>
 @property (nonatomic, readonly) MTKView *mtkView;
 @property (nonatomic, strong) id <MTLDevice> device;
 @property (nonatomic, strong) id <MTLCommandQueue> commandQueue;
 @end
 
 @implementation ViewController
 
 - (instancetype)initWithNibName:(nullable NSString *)nibNameOrNil bundle:(nullable NSBundle *)nibBundleOrNil
 {
     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
 
     _device = MTLCreateSystemDefaultDevice();
     _commandQueue = [_device newCommandQueue];
 
     if (!self.device)
     {
         NSLog(@"Metal is not supported");
         abort();
     }
 
     // Setup Dear ImGui context
     // FIXME: This example doesn't have proper cleanup...
     IMGUI_CHECKVERSION();
     ImGui::CreateContext();
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
     //ImGui::StyleColorsClassic();
 
     // Setup Renderer backend
     ImGui_ImplMetal_Init(_device);
 
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
     // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Read 'docs/FONTS.txt' for more instructions and details.
     // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
     //io.Fonts->AddFontDefault();
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
     //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
     //IM_ASSERT(font != NULL);
 
     return self;
 }
 
 - (MTKView *)mtkView
 {
     return (MTKView *)self.view;
 }
 
 - (void)loadView
 {
     self.view = [[MTKView alloc] initWithFrame:CGRectMake(0, 0, 1200, 720)];
 }
 
 - (void)viewDidLoad
 {
     [super viewDidLoad];
 
     self.mtkView.device = self.device;
     self.mtkView.delegate = self;
 
 #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 Dear 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.
     // To match the behavior of other backends, we pass every event down to the OS.
     NSEventMask eventMask = NSEventMaskKeyDown | NSEventMaskKeyUp | NSEventMaskFlagsChanged | NSEventTypeScrollWheel;
     [NSEvent addLocalMonitorForEventsMatchingMask:eventMask handler:^NSEvent * _Nullable(NSEvent *event)
     {
         ImGui_ImplOSX_HandleEvent(event, self.view);
         return event;
     }];
 
     ImGui_ImplOSX_Init();
 
 #endif
 }
 
 #pragma mark - Interaction
 
 #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)rightMouseDown:(NSEvent *)event {
     ImGui_ImplOSX_HandleEvent(event, self.view);
 }
 
 - (void)otherMouseDown:(NSEvent *)event {
     ImGui_ImplOSX_HandleEvent(event, self.view);
 }
 
 - (void)mouseUp:(NSEvent *)event {
     ImGui_ImplOSX_HandleEvent(event, self.view);
 }
 
 - (void)rightMouseUp:(NSEvent *)event {
     ImGui_ImplOSX_HandleEvent(event, self.view);
 }
 
 - (void)otherMouseUp:(NSEvent *)event {
     ImGui_ImplOSX_HandleEvent(event, self.view);
 }
 
 - (void)mouseDragged:(NSEvent *)event {
     ImGui_ImplOSX_HandleEvent(event, self.view);
 }
 
 - (void)rightMouseDragged:(NSEvent *)event {
     ImGui_ImplOSX_HandleEvent(event, self.view);
 }
 
 - (void)otherMouseDragged:(NSEvent *)event {
     ImGui_ImplOSX_HandleEvent(event, self.view);
 }
 
 - (void)scrollWheel:(NSEvent *)event {
     ImGui_ImplOSX_HandleEvent(event, self.view);
 }
 
 #else
 
 // 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
 
 #pragma mark - MTKViewDelegate
 
 - (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];
 
     // Our state (make them static = more or less global) as a convenience to keep the example terse.
     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[3], clear_color[1] * clear_color[3], clear_color[2] * clear_color[3], clear_color[3]);
 
         // Here, you could do additional rendering work, including other passes as necessary.
 
         id <MTLRenderCommandEncoder> renderEncoder = [commandBuffer renderCommandEncoderWithDescriptor:renderPassDescriptor];
         [renderEncoder pushDebugGroup:@"ImGui demo"];
 
         // Start the Dear ImGui frame
         ImGui_ImplMetal_NewFrame(renderPassDescriptor);
 #if TARGET_OS_OSX
         ImGui_ImplOSX_NewFrame(view);
 #endif
         ImGui::NewFrame();
 
         // 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
         if (show_demo_window)
             ImGui::ShowDemoWindow(&show_demo_window);
 
         // 2. Show a simple window that we create ourselves. We use a Begin/End pair to created a named window.
         {
             static float f = 0.0f;
             static int counter = 0;
 
             ImGui::Begin("Hello, world!");                          // Create a window called "Hello, world!" and append into it.
 
             ImGui::Text("This is some useful text.");               // Display some text (you can use a format strings too)
             ImGui::Checkbox("Demo Window", &show_demo_window);      // Edit bools storing our window open/close state
             ImGui::Checkbox("Another Window", &show_another_window);
 
             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
 
             if (ImGui::Button("Button"))                            // Buttons return true when clicked (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);
             ImGui::End();
         }
 
         // 3. Show another simple window.
         if (show_another_window)
         {
             ImGui::Begin("Another Window", &show_another_window);   // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
             ImGui::Text("Hello from another window!");
             if (ImGui::Button("Close Me"))
                 show_another_window = false;
             ImGui::End();
         }
 
         // Rendering
         ImGui::Render();
         ImDrawData* draw_data = ImGui::GetDrawData();
         ImGui_ImplMetal_RenderDrawData(draw_data, commandBuffer, renderEncoder);
 
         [renderEncoder popDebugGroup];
         [renderEncoder endEncoding];
 
         [commandBuffer presentDrawable:view.currentDrawable];
     }
 
     [commandBuffer commit];
 }
 
 - (void)mtkView:(MTKView*)view drawableSizeWillChange:(CGSize)size
 {
 }
 
 @end
 
 #pragma mark - Application Delegate
 
 #if TARGET_OS_OSX
 
 @interface AppDelegate : NSObject <NSApplicationDelegate>
 @property (nonatomic, strong) NSWindow *window;
 @end
 
 @implementation AppDelegate
 
 - (instancetype)init
 {
     if (self = [super init])
     {
         NSViewController *rootViewController = [[ViewController alloc] initWithNibName:nil bundle:nil];
         self.window = [[NSWindow alloc] initWithContentRect:NSZeroRect
                                                   styleMask:NSWindowStyleMaskTitled | NSWindowStyleMaskClosable | NSWindowStyleMaskResizable | NSWindowStyleMaskMiniaturizable
                                                     backing:NSBackingStoreBuffered
                                                       defer:NO];
         self.window.contentViewController = rootViewController;
         [self.window orderFront:self];
         [self.window center];
         [self.window becomeKeyWindow];
     }
     return self;
 }
 
 - (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender
 {
     return YES;
 }
 
 @end
 
 #else
 
 @interface AppDelegate : UIResponder <UIApplicationDelegate>
 @property (strong, nonatomic) UIWindow *window;
 @end
 
 @implementation AppDelegate
 
 - (BOOL)application:(UIApplication *)application
     didFinishLaunchingWithOptions:(NSDictionary<UIApplicationLaunchOptionsKey,id> *)launchOptions
 {
     UIViewController *rootViewController = [[ViewController alloc] init];
     self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
     self.window.rootViewController = rootViewController;
     [self.window makeKeyAndVisible];
     return YES;
 }
 
 @end
 
 #endif
 
 #pragma mark - main()
 
 #if TARGET_OS_OSX
 
 int main(int argc, const char * argv[])
 {
     return NSApplicationMain(argc, argv);
 }
 
 #else
 
 int main(int argc, char * argv[])
 {
     @autoreleasepool
     {
         return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
     }
 }
 
 #endif