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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System;
using System.IO;
using Num = System.Numerics;
namespace ImGuiNET.SampleProgram.XNA
/// <summary>
/// Simple FNA + ImGui example
/// </summary>
public class SampleGame : Game
private GraphicsDeviceManager _graphics;
private ImGuiRenderer _imGuiRenderer;
private Texture2D _xnaTexture;
private IntPtr _imGuiTexture;
public SampleGame()
_graphics = new GraphicsDeviceManager(this);
_graphics.PreferredBackBufferWidth = 1024;
_graphics.PreferredBackBufferHeight = 768;
_graphics.PreferMultiSampling = true;
IsMouseVisible = true;
protected override void Initialize()
_imGuiRenderer = new ImGuiRenderer(this);
protected override void LoadContent()
// Texture loading example
// First, load the texture as a Texture2D (can also be done using the XNA/FNA content pipeline)
_xnaTexture = CreateTexture(GraphicsDevice, 300, 150, pixel =>
var red = (pixel % 300) / 2;
return new Color(red, 1, 1);
// Then, bind it to an ImGui-friendly pointer, that we can use during regular ImGui.** calls (see below)
_imGuiTexture = _imGuiRenderer.BindTexture(_xnaTexture);
protected override void Draw(GameTime gameTime)
GraphicsDevice.Clear(new Color(clear_color.X, clear_color.Y, clear_color.Z));
// Call BeforeLayout first to set things up
// Draw our UI
// Call AfterLayout now to finish up and draw all the things
// Direct port of the example at
private float f = 0.0f;
private bool show_test_window = false;
private bool show_another_window = false;
private Num.Vector3 clear_color = new Num.Vector3(114f / 255f, 144f / 255f, 154f / 255f);
private byte[] _textBuffer = new byte[100];
protected virtual void ImGuiLayout()
// 1. Show a simple window
// Tip: if we don't call ImGui.Begin()/ImGui.End() the widgets appears in a window automatically called "Debug"
ImGui.Text("Hello, world!");
ImGui.SliderFloat("float", ref f, 0.0f, 1.0f, string.Empty, 1f);
ImGui.ColorEdit3("clear color", ref clear_color);
if (ImGui.Button("Test Window")) show_test_window = !show_test_window;
if (ImGui.Button("Another Window")) show_another_window = !show_another_window;
ImGui.Text(string.Format("Application average {0:F3} ms/frame ({1:F1} FPS)", 1000f / ImGui.GetIO().Framerate, ImGui.GetIO().Framerate));
ImGui.InputText("Text input", _textBuffer, 100);
ImGui.Text("Texture sample");
ImGui.Image(_imGuiTexture, new Num.Vector2(300, 150), Num.Vector2.Zero, Num.Vector2.One, Num.Vector4.One, Num.Vector4.One); // Here, the previously loaded texture is used
// 2. Show another simple window, this time using an explicit Begin/End pair
if (show_another_window)
ImGui.SetNextWindowSize(new Num.Vector2(200, 100), ImGuiCond.FirstUseEver);
ImGui.Begin("Another Window", ref show_another_window);
// 3. Show the ImGui test window. Most of the sample code is in ImGui.ShowTestWindow()
if (show_test_window)
ImGui.SetNextWindowPos(new Num.Vector2(650, 20), ImGuiCond.FirstUseEver);
ImGui.ShowDemoWindow(ref show_test_window);
public static Texture2D CreateTexture(GraphicsDevice device, int width, int height, Func<int, Color> paint)
//initialize a texture
var texture = new Texture2D(device, width, height);
//the array holds the color for each pixel in the texture
Color[] data = new Color[width * height];
for(var pixel = 0; pixel < data.Length; pixel++)
//the function applies the color according to the specified pixel
data[pixel] = paint( pixel );
//set the color
texture.SetData( data );
return texture;
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