320 lines
11 KiB
C#
320 lines
11 KiB
C#
using System.Numerics;
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using ImGuiNET;
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using Raylib_cs;
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using DaggerFramework.Rendering;
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namespace DaggerFramework.SceneGraph
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{
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public class ImGuiRenderLayer : Layer
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{
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protected override void OnDraw(Renderer renderer)
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{
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Layout();
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_controller.Draw(renderer);
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}
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protected virtual void Layout() { }
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protected override void OnStart()
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{
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_controller = new ImGuiController();
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_controller.Load(Scene.Renderer.WindowSize);
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}
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protected override void OnUpdate(double dt)
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{
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_controller.Update(dt, Input);
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}
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private ImGuiController _controller;
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}
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public class ImGuiController : IDisposable, IDrawable
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{
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public ImGuiController()
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{
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_context = ImGui.CreateContext();
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ImGui.SetCurrentContext(_context);
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}
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public void Dispose()
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{
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ImGui.DestroyContext();
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}
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public void Load(Vector2 size)
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{
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ImGuiIOPtr io = ImGui.GetIO();
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io.Fonts.AddFontDefault();
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Resize(size);
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LoadFontTexture();
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SetupInput();
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ImGui.NewFrame();
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}
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unsafe void LoadFontTexture()
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{
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ImGuiIOPtr io = ImGui.GetIO();
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io.Fonts.GetTexDataAsRGBA32(out byte* pixels, out int width, out int height);
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// TODO: use engine API instead of Raylib.
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Image image = new Image
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{
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data = pixels,
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width = width,
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height = height,
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mipmaps = 1,
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format = PixelFormat.PIXELFORMAT_UNCOMPRESSED_R8G8B8A8,
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};
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_fontTexture = Raylib.LoadTextureFromImage(image);
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io.Fonts.SetTexID(new IntPtr(_fontTexture.id));
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io.Fonts.ClearTexData();
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}
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private void SetupInput()
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{
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ImGuiIOPtr io = ImGui.GetIO();
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// Setup config flags
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io.ConfigFlags |= ImGuiConfigFlags.NavEnableKeyboard;
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// Setup back-end capabilities flags
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io.BackendFlags |= ImGuiBackendFlags.HasMouseCursors;
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io.BackendFlags |= ImGuiBackendFlags.HasSetMousePos;
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// Keyboard mapping. ImGui will use those indices to peek into the io.KeysDown[] array.
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io.KeyMap[(int)ImGuiKey.Tab] = (int)KeyboardKey.Tab;
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io.KeyMap[(int)ImGuiKey.LeftArrow] = (int)KeyboardKey.Left;
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io.KeyMap[(int)ImGuiKey.RightArrow] = (int)KeyboardKey.Right;
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io.KeyMap[(int)ImGuiKey.UpArrow] = (int)KeyboardKey.Up;
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io.KeyMap[(int)ImGuiKey.DownArrow] = (int)KeyboardKey.Down;
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io.KeyMap[(int)ImGuiKey.PageUp] = (int)KeyboardKey.PageUp;
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io.KeyMap[(int)ImGuiKey.PageDown] = (int)KeyboardKey.PageDown;
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io.KeyMap[(int)ImGuiKey.Home] = (int)KeyboardKey.Home;
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io.KeyMap[(int)ImGuiKey.End] = (int)KeyboardKey.End;
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io.KeyMap[(int)ImGuiKey.Insert] = (int)KeyboardKey.Insert;
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io.KeyMap[(int)ImGuiKey.Delete] = (int)KeyboardKey.Delete;
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io.KeyMap[(int)ImGuiKey.Backspace] = (int)KeyboardKey.Backspace;
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io.KeyMap[(int)ImGuiKey.Space] = (int)KeyboardKey.Spacebar;
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io.KeyMap[(int)ImGuiKey.Enter] = (int)KeyboardKey.Enter;
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io.KeyMap[(int)ImGuiKey.Escape] = (int)KeyboardKey.Escape;
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io.KeyMap[(int)ImGuiKey.A] = (int)KeyboardKey.A;
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io.KeyMap[(int)ImGuiKey.C] = (int)KeyboardKey.C;
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io.KeyMap[(int)ImGuiKey.V] = (int)KeyboardKey.V;
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io.KeyMap[(int)ImGuiKey.X] = (int)KeyboardKey.X;
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io.KeyMap[(int)ImGuiKey.Y] = (int)KeyboardKey.Y;
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io.KeyMap[(int)ImGuiKey.Z] = (int)KeyboardKey.Z;
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}
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public void Resize(Vector2 size)
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{
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ImGuiIOPtr io = ImGui.GetIO();
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io.DisplaySize = size / _scaleFactor;
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}
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public void Update(double dt, InputHandler input)
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{
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ImGuiIOPtr io = ImGui.GetIO();
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io.DisplayFramebufferScale = Vector2.One;
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io.DeltaTime = (float)dt;
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UpdateKeyboard(input);
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UpdateMouse(input);
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ImGui.NewFrame();
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}
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private void UpdateKeyboard(InputHandler input)
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{
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ImGuiIOPtr io = ImGui.GetIO();
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// Modifiers are not reliable across systems
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io.KeyCtrl = io.KeysDown[(int)KeyboardKey.LeftControl] || io.KeysDown[(int)KeyboardKey.RightControl];
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io.KeyShift = io.KeysDown[(int)KeyboardKey.LeftShift] || io.KeysDown[(int)KeyboardKey.RightShift];
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io.KeyAlt = io.KeysDown[(int)KeyboardKey.LeftAlt] || io.KeysDown[(int)KeyboardKey.RightAlt];
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io.KeySuper = io.KeysDown[(int)KeyboardKey.LeftSuper] || io.KeysDown[(int)KeyboardKey.RightSuper];
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// Key states
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for (int i = (int)KeyboardKey.Spacebar; i < (int)KeyboardKey.KBMenu + 1; i++)
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{
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io.KeysDown[i] = input.IsKeyboardKeyDown((KeyboardKey)i);
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}
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// Key input
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int keyPressed = input.GetCharPressed();
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if (keyPressed != 0)
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{
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io.AddInputCharacter((uint)keyPressed);
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}
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}
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private void UpdateMouse(InputHandler input)
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{
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ImGuiIOPtr io = ImGui.GetIO();
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// Store button states
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for (int i = 0; i < io.MouseDown.Count; i++)
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{
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io.MouseDown[i] = input.IsMouseButtonDown((MouseButton)i);
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}
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// Mouse scroll
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io.MouseWheel += input.GetMouseWheelMovement();
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// Mouse position
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Vector2 mousePosition = io.MousePos;
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// TODO:
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// bool focused = Raylib.IsWindowFocused();
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if (io.WantSetMousePos)
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{
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input.SetMousePosition(mousePosition);
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}
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else
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{
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io.MousePos = input.GetMousePosition();
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}
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// Mouse cursor state
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if ((io.ConfigFlags & ImGuiConfigFlags.NoMouseCursorChange) == 0 || input.IsCursorHidden())
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{
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ImGuiMouseCursor cursor = ImGui.GetMouseCursor();
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if (cursor == ImGuiMouseCursor.None || io.MouseDrawCursor)
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{
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input.HideCursor();
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}
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else
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{
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input.ShowCursor();
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}
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}
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}
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private void Render()
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{
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ImGui.Render();
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}
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private void RenderCommandLists(ImDrawDataPtr data)
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{
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// Scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
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int fbWidth = (int)(data.DisplaySize.X * data.FramebufferScale.X);
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int fbHeight = (int)(data.DisplaySize.Y * data.FramebufferScale.Y);
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// Avoid rendering if display is minimized or if the command list is empty
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if (fbWidth <= 0 || fbHeight <= 0 || data.CmdListsCount == 0)
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{
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return;
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}
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Rlgl.rlDrawRenderBatchActive();
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Rlgl.rlDisableBackfaceCulling();
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Rlgl.rlEnableScissorTest();
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data.ScaleClipRects(ImGui.GetIO().DisplayFramebufferScale);
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for (int n = 0; n < data.CmdListsCount; n++)
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{
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int idxOffset = 0;
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ImDrawListPtr cmdList = data.CmdListsRange[n];
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// Vertex buffer and index buffer generated by DearImGui
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ImPtrVector<ImDrawVertPtr> vtxBuffer = cmdList.VtxBuffer;
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ImVector<ushort> idxBuffer = cmdList.IdxBuffer;
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for (int cmdi = 0; cmdi < cmdList.CmdBuffer.Size; cmdi++)
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{
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ImDrawCmdPtr pcmd = cmdList.CmdBuffer[cmdi];
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// Scissor rect
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Vector2 pos = data.DisplayPos;
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int rectX = (int)((pcmd.ClipRect.X - pos.X) * data.FramebufferScale.X);
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int rectY = (int)((pcmd.ClipRect.Y - pos.Y) * data.FramebufferScale.Y);
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int rectW = (int)((pcmd.ClipRect.Z - rectX) * data.FramebufferScale.Y);
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int rectH = (int)((pcmd.ClipRect.W - rectY) * data.FramebufferScale.Y);
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Rlgl.rlScissor(rectX, Raylib.GetScreenHeight() - (rectY + rectH), rectW, rectH);
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if (pcmd.UserCallback != IntPtr.Zero)
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{
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// pcmd.UserCallback(cmdList, pcmd);
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idxOffset += (int)pcmd.ElemCount;
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}
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else
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{
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DrawTriangles(pcmd.ElemCount, idxOffset, (int)pcmd.VtxOffset, idxBuffer, vtxBuffer, pcmd.TextureId);
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idxOffset += (int)pcmd.ElemCount;
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Rlgl.rlDrawRenderBatchActive();
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}
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}
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}
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Rlgl.rlSetTexture(0);
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Rlgl.rlDisableScissorTest();
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Rlgl.rlEnableBackfaceCulling();
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}
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private Color GetColor(uint hexValue)
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{
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Color color = new Color();
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color.R = (byte)(hexValue & 0xFF) / 255f;
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color.G = (byte)((hexValue >> 8) & 0xFF) / 255f;
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color.B = (byte)((hexValue >> 16) & 0xFF) / 255f;
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color.A = (byte)((hexValue >> 24) & 0xFF) / 255f;
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return color;
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}
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void DrawTriangleVertex(ImDrawVertPtr idxVert)
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{
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Color c = GetColor(idxVert.col);
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Rlgl.rlColor4ub((byte)Math.Round(c.R * 255f), (byte)Math.Round(c.G * 255f), (byte)Math.Round(c.B * 255f), (byte)Math.Round(c.A * 255f));
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Rlgl.rlTexCoord2f(idxVert.uv.X, idxVert.uv.Y);
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Rlgl.rlVertex2f(idxVert.pos.X, idxVert.pos.Y);
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}
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// Draw the imgui triangle data
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private void DrawTriangles(uint count, int idxOffset, int vtxOffset, ImVector<ushort> idxBuffer, ImPtrVector<ImDrawVertPtr> idxVert, IntPtr textureId)
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{
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ushort index = 0;
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ImDrawVertPtr vertex;
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if (Rlgl.rlCheckRenderBatchLimit((int)count * 3))
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{
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Rlgl.rlDrawRenderBatchActive();
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}
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Rlgl.rlBegin(DrawMode.TRIANGLES);
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Rlgl.rlSetTexture((uint)textureId);
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for (int i = 0; i <= (count - 3); i += 3)
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{
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index = idxBuffer[idxOffset + i];
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vertex = idxVert[vtxOffset + index];
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DrawTriangleVertex(vertex);
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index = idxBuffer[idxOffset + i + 1];
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vertex = idxVert[vtxOffset + index];
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DrawTriangleVertex(vertex);
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index = idxBuffer[idxOffset + i + 2];
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vertex = idxVert[vtxOffset + index];
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DrawTriangleVertex(vertex);
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}
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Rlgl.rlEnd();
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}
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public void Draw(Renderer renderer)
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{
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ImGui.Render();
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RenderCommandLists(ImGui.GetDrawData());
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}
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private IntPtr _context;
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private Texture2D _fontTexture;
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private Vector2 _scaleFactor = Vector2.One;
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}
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} |