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This commit is contained in:
4sval
539
FModel/Framework/ImGuiController.cs
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539
FModel/Framework/ImGuiController.cs
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@@ -0,0 +1,539 @@
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Runtime.CompilerServices;
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using ImGuiNET;
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using OpenTK.Graphics.OpenGL4;
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using OpenTK.Mathematics;
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using OpenTK.Windowing.Desktop;
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using OpenTK.Windowing.GraphicsLibraryFramework;
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using ErrorCode = OpenTK.Graphics.OpenGL4.ErrorCode;
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namespace FModel.Framework;
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public class ImGuiController : IDisposable
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{
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private bool _frameBegun;
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private int _vertexArray;
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private int _vertexBuffer;
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private int _vertexBufferSize;
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private int _indexBuffer;
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private int _indexBufferSize;
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//private Texture _fontTexture;
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private int _fontTexture;
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private int _shader;
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private int _shaderFontTextureLocation;
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private int _shaderProjectionMatrixLocation;
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private int _windowWidth;
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private int _windowHeight;
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private System.Numerics.Vector2 _scaleFactor = System.Numerics.Vector2.One;
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private static bool KHRDebugAvailable = false;
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public ImGuiController(int width, int height)
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{
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_windowWidth = width;
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_windowHeight = height;
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int major = GL.GetInteger(GetPName.MajorVersion);
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int minor = GL.GetInteger(GetPName.MinorVersion);
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KHRDebugAvailable = (major == 4 && minor >= 3) || IsExtensionSupported("KHR_debug");
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IntPtr context = ImGui.CreateContext();
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ImGui.SetCurrentContext(context);
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var io = ImGui.GetIO();
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io.Fonts.AddFontDefault();
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io.Fonts.AddFontFromFileTTF("C:\\Windows\\Fonts\\segoeui.ttf", 16);
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io.BackendFlags |= ImGuiBackendFlags.RendererHasVtxOffset;
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CreateDeviceResources();
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SetKeyMappings();
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SetPerFrameImGuiData(1f / 60f);
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ImGui.NewFrame();
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_frameBegun = true;
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}
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public void WindowResized(int width, int height)
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{
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_windowWidth = width;
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_windowHeight = height;
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}
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public void DestroyDeviceObjects()
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{
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Dispose();
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}
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public void CreateDeviceResources()
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{
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_vertexBufferSize = 10000;
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_indexBufferSize = 2000;
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int prevVAO = GL.GetInteger(GetPName.VertexArrayBinding);
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int prevArrayBuffer = GL.GetInteger(GetPName.ArrayBufferBinding);
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_vertexArray = GL.GenVertexArray();
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GL.BindVertexArray(_vertexArray);
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LabelObject(ObjectLabelIdentifier.VertexArray, _vertexArray, "ImGui");
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_vertexBuffer = GL.GenBuffer();
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GL.BindBuffer(BufferTarget.ArrayBuffer, _vertexBuffer);
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LabelObject(ObjectLabelIdentifier.Buffer, _vertexBuffer, "VBO: ImGui");
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GL.BufferData(BufferTarget.ArrayBuffer, _vertexBufferSize, IntPtr.Zero, BufferUsageHint.DynamicDraw);
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_indexBuffer = GL.GenBuffer();
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GL.BindBuffer(BufferTarget.ElementArrayBuffer, _indexBuffer);
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LabelObject(ObjectLabelIdentifier.Buffer, _indexBuffer, "EBO: ImGui");
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GL.BufferData(BufferTarget.ElementArrayBuffer, _indexBufferSize, IntPtr.Zero, BufferUsageHint.DynamicDraw);
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RecreateFontDeviceTexture();
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string VertexSource = @"#version 330 core
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uniform mat4 projection_matrix;
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layout(location = 0) in vec2 in_position;
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layout(location = 1) in vec2 in_texCoord;
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layout(location = 2) in vec4 in_color;
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out vec4 color;
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out vec2 texCoord;
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void main()
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{
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gl_Position = projection_matrix * vec4(in_position, 0, 1);
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color = in_color;
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texCoord = in_texCoord;
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}";
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string FragmentSource = @"#version 330 core
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uniform sampler2D in_fontTexture;
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in vec4 color;
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in vec2 texCoord;
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out vec4 outputColor;
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void main()
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{
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outputColor = color * texture(in_fontTexture, texCoord);
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}";
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_shader = CreateProgram("ImGui", VertexSource, FragmentSource);
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_shaderProjectionMatrixLocation = GL.GetUniformLocation(_shader, "projection_matrix");
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_shaderFontTextureLocation = GL.GetUniformLocation(_shader, "in_fontTexture");
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int stride = Unsafe.SizeOf<ImDrawVert>();
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GL.VertexAttribPointer(0, 2, VertexAttribPointerType.Float, false, stride, 0);
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GL.VertexAttribPointer(1, 2, VertexAttribPointerType.Float, false, stride, 8);
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GL.VertexAttribPointer(2, 4, VertexAttribPointerType.UnsignedByte, true, stride, 16);
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GL.EnableVertexAttribArray(0);
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GL.EnableVertexAttribArray(1);
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GL.EnableVertexAttribArray(2);
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GL.BindVertexArray(prevVAO);
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GL.BindBuffer(BufferTarget.ArrayBuffer, prevArrayBuffer);
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CheckGLError("End of ImGui setup");
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}
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/// <summary>
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/// Recreates the device texture used to render text.
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/// </summary>
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public void RecreateFontDeviceTexture()
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{
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ImGuiIOPtr io = ImGui.GetIO();
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io.Fonts.GetTexDataAsRGBA32(out IntPtr pixels, out int width, out int height, out int bytesPerPixel);
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int mips = (int)Math.Floor(Math.Log(Math.Max(width, height), 2));
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int prevActiveTexture = GL.GetInteger(GetPName.ActiveTexture);
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GL.ActiveTexture(TextureUnit.Texture0);
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int prevTexture2D = GL.GetInteger(GetPName.TextureBinding2D);
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_fontTexture = GL.GenTexture();
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GL.BindTexture(TextureTarget.Texture2D, _fontTexture);
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GL.TexStorage2D(TextureTarget2d.Texture2D, mips, SizedInternalFormat.Rgba8, width, height);
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LabelObject(ObjectLabelIdentifier.Texture, _fontTexture, "ImGui Text Atlas");
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GL.TexSubImage2D(TextureTarget.Texture2D, 0, 0, 0, width, height, PixelFormat.Bgra, PixelType.UnsignedByte, pixels);
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GL.GenerateMipmap(GenerateMipmapTarget.Texture2D);
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMaxLevel, mips - 1);
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
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// Restore state
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GL.BindTexture(TextureTarget.Texture2D, prevTexture2D);
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GL.ActiveTexture((TextureUnit)prevActiveTexture);
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io.Fonts.SetTexID((IntPtr)_fontTexture);
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io.Fonts.ClearTexData();
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}
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/// <summary>
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/// Renders the ImGui draw list data.
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/// </summary>
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public void Render()
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{
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if (_frameBegun)
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{
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_frameBegun = false;
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ImGui.Render();
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RenderImDrawData(ImGui.GetDrawData());
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}
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}
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/// <summary>
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/// Updates ImGui input and IO configuration state.
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/// </summary>
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public void Update(GameWindow wnd, float deltaSeconds)
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{
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if (_frameBegun)
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{
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ImGui.Render();
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}
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SetPerFrameImGuiData(deltaSeconds);
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UpdateImGuiInput(wnd);
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_frameBegun = true;
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ImGui.NewFrame();
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}
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/// <summary>
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/// Sets per-frame data based on the associated window.
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/// This is called by Update(float).
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/// </summary>
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private void SetPerFrameImGuiData(float deltaSeconds)
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{
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ImGuiIOPtr io = ImGui.GetIO();
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io.DisplaySize = new System.Numerics.Vector2(
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_windowWidth / _scaleFactor.X,
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_windowHeight / _scaleFactor.Y);
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io.DisplayFramebufferScale = _scaleFactor;
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io.DeltaTime = deltaSeconds; // DeltaTime is in seconds.
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}
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readonly List<char> PressedChars = new List<char>();
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private void UpdateImGuiInput(GameWindow wnd)
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{
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ImGuiIOPtr io = ImGui.GetIO();
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MouseState MouseState = wnd.MouseState;
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KeyboardState KeyboardState = wnd.KeyboardState;
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io.MouseDown[0] = MouseState[MouseButton.Left];
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io.MouseDown[1] = MouseState[MouseButton.Right];
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io.MouseDown[2] = MouseState[MouseButton.Middle];
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var screenPoint = new Vector2i((int)MouseState.X, (int)MouseState.Y);
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var point = screenPoint;//wnd.PointToClient(screenPoint);
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io.MousePos = new System.Numerics.Vector2(point.X, point.Y);
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foreach (Keys key in Enum.GetValues(typeof(Keys)))
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{
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if (key == Keys.Unknown)
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{
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continue;
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}
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io.KeysDown[(int)key] = KeyboardState.IsKeyDown(key);
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}
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foreach (var c in PressedChars)
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{
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io.AddInputCharacter(c);
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}
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PressedChars.Clear();
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io.KeyCtrl = KeyboardState.IsKeyDown(Keys.LeftControl) || KeyboardState.IsKeyDown(Keys.RightControl);
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io.KeyAlt = KeyboardState.IsKeyDown(Keys.LeftAlt) || KeyboardState.IsKeyDown(Keys.RightAlt);
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io.KeyShift = KeyboardState.IsKeyDown(Keys.LeftShift) || KeyboardState.IsKeyDown(Keys.RightShift);
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io.KeySuper = KeyboardState.IsKeyDown(Keys.LeftSuper) || KeyboardState.IsKeyDown(Keys.RightSuper);
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}
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internal void PressChar(char keyChar)
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{
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PressedChars.Add(keyChar);
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}
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internal void MouseScroll(Vector2 offset)
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{
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ImGuiIOPtr io = ImGui.GetIO();
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io.MouseWheel = offset.Y;
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io.MouseWheelH = offset.X;
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}
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private static void SetKeyMappings()
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{
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ImGuiIOPtr io = ImGui.GetIO();
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io.KeyMap[(int)ImGuiKey.Tab] = (int)Keys.Tab;
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io.KeyMap[(int)ImGuiKey.LeftArrow] = (int)Keys.Left;
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io.KeyMap[(int)ImGuiKey.RightArrow] = (int)Keys.Right;
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io.KeyMap[(int)ImGuiKey.UpArrow] = (int)Keys.Up;
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io.KeyMap[(int)ImGuiKey.DownArrow] = (int)Keys.Down;
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io.KeyMap[(int)ImGuiKey.PageUp] = (int)Keys.PageUp;
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io.KeyMap[(int)ImGuiKey.PageDown] = (int)Keys.PageDown;
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io.KeyMap[(int)ImGuiKey.Home] = (int)Keys.Home;
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io.KeyMap[(int)ImGuiKey.End] = (int)Keys.End;
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io.KeyMap[(int)ImGuiKey.Delete] = (int)Keys.Delete;
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io.KeyMap[(int)ImGuiKey.Backspace] = (int)Keys.Backspace;
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io.KeyMap[(int)ImGuiKey.Enter] = (int)Keys.Enter;
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io.KeyMap[(int)ImGuiKey.Escape] = (int)Keys.Escape;
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io.KeyMap[(int)ImGuiKey.A] = (int)Keys.A;
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io.KeyMap[(int)ImGuiKey.C] = (int)Keys.C;
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io.KeyMap[(int)ImGuiKey.V] = (int)Keys.V;
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io.KeyMap[(int)ImGuiKey.X] = (int)Keys.X;
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io.KeyMap[(int)ImGuiKey.Y] = (int)Keys.Y;
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io.KeyMap[(int)ImGuiKey.Z] = (int)Keys.Z;
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}
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private void RenderImDrawData(ImDrawDataPtr draw_data)
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{
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if (draw_data.CmdListsCount == 0)
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{
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return;
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}
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// Get intial state.
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int prevVAO = GL.GetInteger(GetPName.VertexArrayBinding);
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int prevArrayBuffer = GL.GetInteger(GetPName.ArrayBufferBinding);
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int prevProgram = GL.GetInteger(GetPName.CurrentProgram);
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bool prevBlendEnabled = GL.GetBoolean(GetPName.Blend);
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bool prevScissorTestEnabled = GL.GetBoolean(GetPName.ScissorTest);
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int prevBlendEquationRgb = GL.GetInteger(GetPName.BlendEquationRgb);
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int prevBlendEquationAlpha = GL.GetInteger(GetPName.BlendEquationAlpha);
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int prevBlendFuncSrcRgb = GL.GetInteger(GetPName.BlendSrcRgb);
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int prevBlendFuncSrcAlpha = GL.GetInteger(GetPName.BlendSrcAlpha);
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int prevBlendFuncDstRgb = GL.GetInteger(GetPName.BlendDstRgb);
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int prevBlendFuncDstAlpha = GL.GetInteger(GetPName.BlendDstAlpha);
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bool prevCullFaceEnabled = GL.GetBoolean(GetPName.CullFace);
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bool prevDepthTestEnabled = GL.GetBoolean(GetPName.DepthTest);
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int prevActiveTexture = GL.GetInteger(GetPName.ActiveTexture);
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GL.ActiveTexture(TextureUnit.Texture0);
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int prevTexture2D = GL.GetInteger(GetPName.TextureBinding2D);
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Span<int> prevScissorBox = stackalloc int[4];
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unsafe
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{
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fixed (int* iptr = &prevScissorBox[0])
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{
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GL.GetInteger(GetPName.ScissorBox, iptr);
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}
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}
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// Bind the element buffer (thru the VAO) so that we can resize it.
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GL.BindVertexArray(_vertexArray);
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// Bind the vertex buffer so that we can resize it.
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GL.BindBuffer(BufferTarget.ArrayBuffer, _vertexBuffer);
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for (int i = 0; i < draw_data.CmdListsCount; i++)
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{
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ImDrawListPtr cmd_list = draw_data.CmdListsRange[i];
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int vertexSize = cmd_list.VtxBuffer.Size * Unsafe.SizeOf<ImDrawVert>();
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if (vertexSize > _vertexBufferSize)
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{
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int newSize = (int)Math.Max(_vertexBufferSize * 1.5f, vertexSize);
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GL.BufferData(BufferTarget.ArrayBuffer, newSize, IntPtr.Zero, BufferUsageHint.DynamicDraw);
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_vertexBufferSize = newSize;
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}
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int indexSize = cmd_list.IdxBuffer.Size * sizeof(ushort);
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if (indexSize > _indexBufferSize)
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{
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int newSize = (int)Math.Max(_indexBufferSize * 1.5f, indexSize);
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GL.BufferData(BufferTarget.ElementArrayBuffer, newSize, IntPtr.Zero, BufferUsageHint.DynamicDraw);
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_indexBufferSize = newSize;
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}
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}
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// Setup orthographic projection matrix into our constant buffer
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ImGuiIOPtr io = ImGui.GetIO();
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Matrix4 mvp = Matrix4.CreateOrthographicOffCenter(
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0.0f,
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io.DisplaySize.X,
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io.DisplaySize.Y,
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0.0f,
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-1.0f,
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1.0f);
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GL.UseProgram(_shader);
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||||
GL.UniformMatrix4(_shaderProjectionMatrixLocation, false, ref mvp);
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GL.Uniform1(_shaderFontTextureLocation, 0);
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||||
CheckGLError("Projection");
|
||||
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GL.BindVertexArray(_vertexArray);
|
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CheckGLError("VAO");
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draw_data.ScaleClipRects(io.DisplayFramebufferScale);
|
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GL.Enable(EnableCap.Blend);
|
||||
GL.Enable(EnableCap.ScissorTest);
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||||
GL.BlendEquation(BlendEquationMode.FuncAdd);
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||||
GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
|
||||
GL.Disable(EnableCap.CullFace);
|
||||
GL.Disable(EnableCap.DepthTest);
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||||
|
||||
// Render command lists
|
||||
for (int n = 0; n < draw_data.CmdListsCount; n++)
|
||||
{
|
||||
ImDrawListPtr cmd_list = draw_data.CmdListsRange[n];
|
||||
|
||||
GL.BufferSubData(BufferTarget.ArrayBuffer, IntPtr.Zero, cmd_list.VtxBuffer.Size * Unsafe.SizeOf<ImDrawVert>(), cmd_list.VtxBuffer.Data);
|
||||
CheckGLError($"Data Vert {n}");
|
||||
|
||||
GL.BufferSubData(BufferTarget.ElementArrayBuffer, IntPtr.Zero, cmd_list.IdxBuffer.Size * sizeof(ushort), cmd_list.IdxBuffer.Data);
|
||||
CheckGLError($"Data Idx {n}");
|
||||
|
||||
for (int cmd_i = 0; cmd_i < cmd_list.CmdBuffer.Size; cmd_i++)
|
||||
{
|
||||
ImDrawCmdPtr pcmd = cmd_list.CmdBuffer[cmd_i];
|
||||
if (pcmd.UserCallback != IntPtr.Zero)
|
||||
{
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||||
throw new NotImplementedException();
|
||||
}
|
||||
else
|
||||
{
|
||||
GL.ActiveTexture(TextureUnit.Texture0);
|
||||
GL.BindTexture(TextureTarget.Texture2D, (int)pcmd.TextureId);
|
||||
CheckGLError("Texture");
|
||||
|
||||
// We do _windowHeight - (int)clip.W instead of (int)clip.Y because gl has flipped Y when it comes to these coordinates
|
||||
var clip = pcmd.ClipRect;
|
||||
GL.Scissor((int)clip.X, _windowHeight - (int)clip.W, (int)(clip.Z - clip.X), (int)(clip.W - clip.Y));
|
||||
CheckGLError("Scissor");
|
||||
|
||||
if ((io.BackendFlags & ImGuiBackendFlags.RendererHasVtxOffset) != 0)
|
||||
{
|
||||
GL.DrawElementsBaseVertex(PrimitiveType.Triangles, (int)pcmd.ElemCount, DrawElementsType.UnsignedShort, (IntPtr)(pcmd.IdxOffset * sizeof(ushort)), unchecked((int)pcmd.VtxOffset));
|
||||
}
|
||||
else
|
||||
{
|
||||
GL.DrawElements(BeginMode.Triangles, (int)pcmd.ElemCount, DrawElementsType.UnsignedShort, (int)pcmd.IdxOffset * sizeof(ushort));
|
||||
}
|
||||
CheckGLError("Draw");
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
GL.Disable(EnableCap.Blend);
|
||||
GL.Disable(EnableCap.ScissorTest);
|
||||
|
||||
// Reset state
|
||||
GL.BindTexture(TextureTarget.Texture2D, prevTexture2D);
|
||||
GL.ActiveTexture((TextureUnit)prevActiveTexture);
|
||||
GL.UseProgram(prevProgram);
|
||||
GL.BindVertexArray(prevVAO);
|
||||
GL.Scissor(prevScissorBox[0], prevScissorBox[1], prevScissorBox[2], prevScissorBox[3]);
|
||||
GL.BindBuffer(BufferTarget.ArrayBuffer, prevArrayBuffer);
|
||||
GL.BlendEquationSeparate((BlendEquationMode)prevBlendEquationRgb, (BlendEquationMode)prevBlendEquationAlpha);
|
||||
GL.BlendFuncSeparate(
|
||||
(BlendingFactorSrc)prevBlendFuncSrcRgb,
|
||||
(BlendingFactorDest)prevBlendFuncDstRgb,
|
||||
(BlendingFactorSrc)prevBlendFuncSrcAlpha,
|
||||
(BlendingFactorDest)prevBlendFuncDstAlpha);
|
||||
if (prevBlendEnabled) GL.Enable(EnableCap.Blend); else GL.Disable(EnableCap.Blend);
|
||||
if (prevDepthTestEnabled) GL.Enable(EnableCap.DepthTest); else GL.Disable(EnableCap.DepthTest);
|
||||
if (prevCullFaceEnabled) GL.Enable(EnableCap.CullFace); else GL.Disable(EnableCap.CullFace);
|
||||
if (prevScissorTestEnabled) GL.Enable(EnableCap.ScissorTest); else GL.Disable(EnableCap.ScissorTest);
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Frees all graphics resources used by the renderer.
|
||||
/// </summary>
|
||||
public void Dispose()
|
||||
{
|
||||
GL.DeleteVertexArray(_vertexArray);
|
||||
GL.DeleteBuffer(_vertexBuffer);
|
||||
GL.DeleteBuffer(_indexBuffer);
|
||||
|
||||
GL.DeleteTexture(_fontTexture);
|
||||
GL.DeleteProgram(_shader);
|
||||
}
|
||||
|
||||
public static void LabelObject(ObjectLabelIdentifier objLabelIdent, int glObject, string name)
|
||||
{
|
||||
if (KHRDebugAvailable)
|
||||
GL.ObjectLabel(objLabelIdent, glObject, name.Length, name);
|
||||
}
|
||||
|
||||
static bool IsExtensionSupported(string name)
|
||||
{
|
||||
int n = GL.GetInteger(GetPName.NumExtensions);
|
||||
for (int i = 0; i < n; i++)
|
||||
{
|
||||
string extension = GL.GetString(StringNameIndexed.Extensions, i);
|
||||
if (extension == name) return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
public static int CreateProgram(string name, string vertexSource, string fragmentSoruce)
|
||||
{
|
||||
int program = GL.CreateProgram();
|
||||
LabelObject(ObjectLabelIdentifier.Program, program, $"Program: {name}");
|
||||
|
||||
int vertex = CompileShader(name, ShaderType.VertexShader, vertexSource);
|
||||
int fragment = CompileShader(name, ShaderType.FragmentShader, fragmentSoruce);
|
||||
|
||||
GL.AttachShader(program, vertex);
|
||||
GL.AttachShader(program, fragment);
|
||||
|
||||
GL.LinkProgram(program);
|
||||
|
||||
GL.GetProgram(program, GetProgramParameterName.LinkStatus, out int success);
|
||||
if (success == 0)
|
||||
{
|
||||
string info = GL.GetProgramInfoLog(program);
|
||||
Debug.WriteLine($"GL.LinkProgram had info log [{name}]:\n{info}");
|
||||
}
|
||||
|
||||
GL.DetachShader(program, vertex);
|
||||
GL.DetachShader(program, fragment);
|
||||
|
||||
GL.DeleteShader(vertex);
|
||||
GL.DeleteShader(fragment);
|
||||
|
||||
return program;
|
||||
}
|
||||
|
||||
private static int CompileShader(string name, ShaderType type, string source)
|
||||
{
|
||||
int shader = GL.CreateShader(type);
|
||||
LabelObject(ObjectLabelIdentifier.Shader, shader, $"Shader: {name}");
|
||||
|
||||
GL.ShaderSource(shader, source);
|
||||
GL.CompileShader(shader);
|
||||
|
||||
GL.GetShader(shader, ShaderParameter.CompileStatus, out int success);
|
||||
if (success == 0)
|
||||
{
|
||||
string info = GL.GetShaderInfoLog(shader);
|
||||
Debug.WriteLine($"GL.CompileShader for shader '{name}' [{type}] had info log:\n{info}");
|
||||
}
|
||||
|
||||
return shader;
|
||||
}
|
||||
|
||||
public static void CheckGLError(string title)
|
||||
{
|
||||
ErrorCode error;
|
||||
int i = 1;
|
||||
while ((error = GL.GetError()) != ErrorCode.NoError)
|
||||
{
|
||||
Debug.Print($"{title} ({i++}): {error}");
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user