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// dear imgui: standalone example application for OSX + OpenGL2, using legacy fixed pipeline
// If you are new to dear imgui, see examples/README.txt and documentation at the top of imgui.cpp.
#include "imgui.h"
#include "../imgui_impl_osx.h"
#include "../imgui_impl_opengl2.h"
#include <stdio.h>
#import <Cocoa/Cocoa.h>
#import <OpenGL/gl.h>
#import <OpenGL/glu.h>
// ImGuiExampleView
@interface ImGuiExampleView : NSOpenGLView
NSTimer* animationTimer;
@implementation ImGuiExampleView
[self setNeedsDisplay:YES];
[super prepareOpenGL];
#ifndef DEBUG
GLint swapInterval = 1;
[[self openGLContext] setValues:&swapInterval forParameter:NSOpenGLCPSwapInterval];
if (swapInterval == 0)
NSLog(@"Error: Cannot set swap interval.");
// Start the Dear ImGui frame
// Global data for the demo
static bool show_demo_window = true;
static bool show_another_window = false;
static ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
// 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)
// 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)
ImGui::Text("counter = %d", counter);
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
// 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;
// Rendering
[[self openGLContext] makeCurrentContext];
ImDrawData* draw_data = ImGui::GetDrawData();
GLsizei width = (GLsizei)(draw_data->DisplaySize.x * draw_data->FramebufferScale.x);
GLsizei height = (GLsizei)(draw_data->DisplaySize.y * draw_data->FramebufferScale.y);
glViewport(0, 0, width, height);
glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
// Present
[[self openGLContext] flushBuffer];
if (!animationTimer)
animationTimer = [NSTimer scheduledTimerWithTimeInterval:0.017 target:self selector:@selector(animationTimerFired:) userInfo:nil repeats:YES];
[[self openGLContext] update];
[self updateAndDrawDemoView];
[self updateAndDrawDemoView];
return (YES);
return (YES);
return (YES);
animationTimer = nil;
// Forward Mouse/Keyboard events to dear imgui OSX back-end. It returns true when imgui is expecting to use the event.
-(void)keyUp:(NSEvent *)event { ImGui_ImplOSX_HandleEvent(event, self); }
-(void)keyDown:(NSEvent *)event { ImGui_ImplOSX_HandleEvent(event, self); }
-(void)flagsChanged:(NSEvent *)event { ImGui_ImplOSX_HandleEvent(event, self); }
-(void)mouseDown:(NSEvent *)event { ImGui_ImplOSX_HandleEvent(event, self); }
-(void)mouseUp:(NSEvent *)event { ImGui_ImplOSX_HandleEvent(event, self); }
-(void)mouseMoved:(NSEvent *)event { ImGui_ImplOSX_HandleEvent(event, self); }
-(void)mouseDragged:(NSEvent *)event { ImGui_ImplOSX_HandleEvent(event, self); }
-(void)scrollWheel:(NSEvent *)event { ImGui_ImplOSX_HandleEvent(event, self); }
// ImGuiExampleAppDelegate
@interface ImGuiExampleAppDelegate : NSObject <NSApplicationDelegate>
@property (nonatomic, readonly) NSWindow* window;
@implementation ImGuiExampleAppDelegate
@synthesize window = _window;
-(BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication
return YES;
if (_window != nil)
return (_window);
NSRect viewRect = NSMakeRect(100.0, 100.0, 100.0 + 1280.0, 100 + 720.0);
_window = [[NSWindow alloc] initWithContentRect:viewRect styleMask:NSWindowStyleMaskTitled|NSWindowStyleMaskMiniaturizable|NSWindowStyleMaskResizable|NSWindowStyleMaskClosable backing:NSBackingStoreBuffered defer:YES];
[_window setTitle:@"Dear ImGui OSX+OpenGL2 Example"];
[_window setAcceptsMouseMovedEvents:YES];
[_window setOpaque:YES];
[_window makeKeyAndOrderFront:NSApp];
return (_window);
NSMenu* mainMenuBar = [[NSMenu alloc] init];
NSMenu* appMenu;
NSMenuItem* menuItem;
appMenu = [[NSMenu alloc] initWithTitle:@"Dear ImGui OSX+OpenGL2 Example"];
menuItem = [appMenu addItemWithTitle:@"Quit Dear ImGui OSX+OpenGL2 Example" action:@selector(terminate:) keyEquivalent:@"q"];
[menuItem setKeyEquivalentModifierMask:NSEventModifierFlagCommand];
menuItem = [[NSMenuItem alloc] init];
[menuItem setSubmenu:appMenu];
[mainMenuBar addItem:menuItem];
appMenu = nil;
[NSApp setMainMenu:mainMenuBar];
_window = nil;
-(void)applicationDidFinishLaunching:(NSNotification *)aNotification
// Make the application a foreground application (else it won't receive keyboard events)
ProcessSerialNumber psn = {0, kCurrentProcess};
TransformProcessType(&psn, kProcessTransformToForegroundApplication);
// Menu
[self setupMenu];
NSOpenGLPixelFormatAttribute attrs[] =
NSOpenGLPFADepthSize, 32,
NSOpenGLPixelFormat* format = [[NSOpenGLPixelFormat alloc] initWithAttributes:attrs];
ImGuiExampleView* view = [[ImGuiExampleView alloc] initWithFrame:self.window.frame pixelFormat:format];
format = nil;
if (floor(NSAppKitVersionNumber) > NSAppKitVersionNumber10_6)
[view setWantsBestResolutionOpenGLSurface:YES];
#endif // MAC_OS_X_VERSION_MAX_ALLOWED >= 1070
[self.window setContentView:view];
if ([view openGLContext] == nil)
NSLog(@"No OpenGL Context!");
// Setup Dear ImGui context
ImGuiIO& io = ImGui::GetIO(); (void)io;
//io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
// Setup Dear ImGui style
// Setup Platform/Renderer bindings
// 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 'misc/fonts/README.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->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);
int main(int argc, const char* argv[])
NSApp = [NSApplication sharedApplication];
ImGuiExampleAppDelegate* delegate = [[ImGuiExampleAppDelegate alloc] init];
[[NSApplication sharedApplication] setDelegate:delegate];
[NSApp run];
return NSApplicationMain(argc, argv);