Added ImGui

2026-09-05 21:01:52 +00:00 · 2020-11-12 23:25:48 +01:00
parent 6e71eeea25
commit 4b877af226
17 changed files with 524 additions and 44 deletions
@@ -0,0 +1,182 @@
+using System;
+using imgui_beef;
+using GlitchyEngine.Events;
+
+// Temporary
+using DirectX.Windows.VirtualKeyCodes;
+using GlitchyEngine.Platform.DX11;
+
+namespace GlitchyEngine.ImGui
+{
+	public class ImGuiLayer : Layer
+	{
+		public this() : base("ImGuiLayer") {  }
+
+		public override void OnAttach()
+		{
+			Log.EngineLogger.Trace("Initializing ImGui...");
+
+			ImGui.CHECKVERSION();
+			ImGui.CreateContext();
+			ImGui.StyleColorsDark();
+			
+			ref ImGui.IO io = ref ImGui.GetIO();
+			io.BackendFlags |= .HasMouseCursors | .HasSetMousePos;
+
+			// Todo: Temporary, needs own keymap
+			// Keyboard mapping. ImGui will use those indices to peek into the io.KeysDown[] array that we will update during the application lifetime.
+			io.KeyMap[(int32)ImGui.Key.Tab] = VK_TAB;
+			io.KeyMap[(int32)ImGui.Key.LeftArrow] = VK_LEFT;
+			io.KeyMap[(int32)ImGui.Key.RightArrow] = VK_RIGHT;
+			io.KeyMap[(int32)ImGui.Key.UpArrow] = VK_UP;
+			io.KeyMap[(int32)ImGui.Key.DownArrow] = VK_DOWN;
+			io.KeyMap[(int32)ImGui.Key.PageUp] = VK_PRIOR;
+			io.KeyMap[(int32)ImGui.Key.PageDown] = VK_NEXT;
+			io.KeyMap[(int32)ImGui.Key.Home] = VK_HOME;
+			io.KeyMap[(int32)ImGui.Key.End] = VK_END;
+			io.KeyMap[(int32)ImGui.Key.Insert] = VK_INSERT;
+			io.KeyMap[(int32)ImGui.Key.Delete] = VK_DELETE;
+			io.KeyMap[(int32)ImGui.Key.Backspace] = VK_BACK;
+			io.KeyMap[(int32)ImGui.Key.Space] = VK_SPACE;
+			io.KeyMap[(int32)ImGui.Key.Enter] = VK_RETURN;
+			io.KeyMap[(int32)ImGui.Key.Escape] = VK_ESCAPE;
+			io.KeyMap[(int32)ImGui.Key.KeyPadEnter] = VK_RETURN;
+			io.KeyMap[(int32)ImGui.Key.A] = (int32)'A';
+			io.KeyMap[(int32)ImGui.Key.C] = (int32)'C';
+			io.KeyMap[(int32)ImGui.Key.V] = (int32)'V';
+			io.KeyMap[(int32)ImGui.Key.X] = (int32)'X';
+			io.KeyMap[(int32)ImGui.Key.Y] = (int32)'Y';
+			io.KeyMap[(int32)ImGui.Key.Z] = (int32)'Z';
+			
+			// Todo: temporary, needs to be platform independant
+			ImGuiImplDx11.Init(Platform.DX11.DirectX.Device, Platform.DX11.DirectX.ImmediateContext);
+		}
+
+		public override void OnDetach()
+		{
+		}
+
+		public override void OnEvent(Event event)
+		{
+			EventDispatcher dispatcher = scope EventDispatcher(event);
+
+			dispatcher.Dispatch<WindowResizeEvent>(scope (e) =>
+				{
+					ref ImGui.IO io = ref ImGui.GetIO();
+					io.DisplaySize = .(e.Width, e.Height);
+					io.DisplayFramebufferScale = .(1.0f, 1.0f);
+
+					return false;
+				});
+
+			dispatcher.Dispatch<MouseMovedEvent>(scope (e) =>
+				{
+					ref ImGui.IO io = ref ImGui.GetIO();
+					io.MousePos = ImGui.Vec2(e.PositionX, e.PositionY);
+
+					return false;
+				});
+
+			dispatcher.Dispatch<MouseButtonPressedEvent>(scope (e) =>
+				{
+					ref ImGui.IO io = ref ImGui.GetIO();
+
+					switch(e.MouseButton)
+					{
+					case .LeftButton:
+						io.MouseDown[(uint)ImGui.MouseButton.Left] = true;
+					case .RightButton:
+						io.MouseDown[(uint)ImGui.MouseButton.Right] = true;
+					case .MiddleButton:
+						io.MouseDown[(uint)ImGui.MouseButton.Middle] = true;
+					default:
+					}
+
+					return false;
+				});
+
+			dispatcher.Dispatch<MouseButtonReleasedEvent>(scope (e) =>
+				{
+					ref ImGui.IO io = ref ImGui.GetIO();
+
+					switch(e.MouseButton)
+					{
+					case .LeftButton:
+						io.MouseDown[(uint)ImGui.MouseButton.Left] = false;
+					case .RightButton:
+						io.MouseDown[(uint)ImGui.MouseButton.Right] = false;
+					case .MiddleButton:
+						io.MouseDown[(uint)ImGui.MouseButton.Middle] = false;
+					default:
+					}
+
+					return false;
+				});
+
+			dispatcher.Dispatch<MouseScrolledEvent>(scope (e) =>
+				{
+					ref ImGui.IO io = ref ImGui.GetIO();
+					io.MouseWheel += e.YOffset;
+					io.MouseWheelH += e.XOffset; // Todo: horizontal mousewheel inverted?!
+
+					return false;
+				});
+
+			dispatcher.Dispatch<KeyPressedEvent>(scope (e) =>
+				{
+					ref ImGui.IO io = ref ImGui.GetIO();
+					io.KeysDown[e.KeyCode] = true;
+					
+					io.KeyCtrl = io.KeysDown[VK_CONTROL];
+					io.KeyShift = io.KeysDown[VK_SHIFT];
+					io.KeyAlt = io.KeysDown[VK_MENU];
+					io.KeySuper = io.KeysDown[VK_LWIN] || io.KeysDown[VK_RWIN];
+
+					return false;
+				});
+
+			dispatcher.Dispatch<KeyReleasedEvent>(scope (e) =>
+				{
+					ref ImGui.IO io = ref ImGui.GetIO();
+					io.KeysDown[e.KeyCode] = false;
+					
+					io.KeyCtrl = io.KeysDown[VK_CONTROL];
+					io.KeyShift = io.KeysDown[VK_SHIFT];
+					io.KeyAlt = io.KeysDown[VK_MENU];
+					io.KeySuper = io.KeysDown[VK_LWIN] || io.KeysDown[VK_RWIN];
+
+					return false;
+				});
+
+			dispatcher.Dispatch<KeyTypedEvent>(scope (e) =>
+				{
+					ref ImGui.IO io = ref ImGui.GetIO();
+					io.AddInputCharacterUTF16((int16)e.Char);
+
+					return false;
+				});
+		}
+
+		bool showDemo = true;
+		public override void Update(GameTime gameTime)
+		{
+			var v = DirectX.ImmediateContext;
+
+			v.OutputMerger.SetRenderTargets(1, &DirectX.BackBufferTarget, null);
+
+			ref ImGui.IO io = ref ImGui.GetIO();
+
+			let window = Application.Get.Window;
+			io.DisplaySize = .(window.Width, window.Height);
+			io.DeltaTime = (float)gameTime.FrameTime.TotalSeconds;
+
+			ImGuiImplDx11.NewFrame();
+			ImGui.NewFrame();
+
+			ImGui.ShowDemoWindow(&showDemo);
+
+			ImGui.Render();
+			ImGuiImplDx11.RenderDrawData(ImGui.GetDrawData());
+		}
+	}
+}