WIP: use Unicode for charmaps inside a font, try read all unicode symbols.

TODO.md

@@ -80,6 +80,8 @@
   - ~~Positioning (anchors)~~
 - ~~Move layouting to Render instead of Update, use Update for input.~~
 - Input propagation
+  - Use GridSet to efficiently query inputtable UI elements.
+  - Add element focus logic, make them focusable with action inputs.
 - Basic input elements (button, text field, toggle).
 - Styling
   - Add style settings for UI panels (for buttons, labels, etc.).

TestGame/TestGame.cs

@@ -81,21 +81,16 @@ public class TestGame : Game
             var lastChild = _container.Children.Last();
             _container.RemoveChild(lastChild);
         }
-
-        if (Input.IsMouseButtonDown(MouseButton.Left))
-        {
-            var mousePos = Input.GetMousePosition();
-            _fillContainer.Size = new Rect(mousePos.X, mousePos.Y);
-        }
     }
 
     protected override void Render(double deltaTime)
     {
         Renderer.ClearBackground(Color.Black);
-        foreach (var emitter in _particleSystem!.Emitters)
-        {
-            DrawEmitter(emitter);
-        }
+
+        // foreach (var emitter in _particleSystem!.Emitters)
+        // {
+        //     DrawEmitter(emitter);
+        // }
 
         Renderer.ResetTransform();
         _uiSystem.Render(Renderer);

Voile/GridSet.cs

@@ -0,0 +1,37 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.Numerics;
+using Voile.Extensions;
+
+namespace Voile;
+
+public class GridSet<T>
+{
+    public float GridSize { get; }
+    public GridSet(float gridSize = 32.0f)
+    {
+        GridSize = gridSize;
+    }
+
+    public void Add(Vector2 position, T child)
+    {
+        var snap = Vector2.One * GridSize;
+        position = position.Snapped(snap);
+
+        if (_values.TryGetValue(position, out var list))
+        {
+            list.Add(child);
+        }
+        else
+        {
+            _values.Add(position, new List<T>());
+        }
+    }
+
+    public void Remove(T child)
+    {
+
+    }
+
+    private Dictionary<Vector2, List<T>> _values = new();
+}

Voile/Source/Extensions/Vector2Extensions.cs

@@ -8,5 +8,31 @@ namespace Voile.Extensions
         {
             return new Vector2((float)MathUtils.Lerp(a.X, b.X, t), (float)MathUtils.Lerp(a.Y, b.Y, t));
         }
+
+        public static Vector2 Snapped(this Vector2 a, Vector2 snap)
+        {
+            var x = a.X % snap.X;
+            var y = a.Y % snap.Y;
+
+            if (x == 0)
+            {
+                x = a.X;
+            }
+            else
+            {
+                x = a.X - x;
+            }
+
+            if (y == 0)
+            {
+                y = a.Y;
+            }
+            else
+            {
+                y = a.Y - y;
+            }
+
+            return new Vector2(x, y);
+        }
     }
 }

Voile/Source/Resources/Font.cs

@@ -1,5 +1,18 @@
+using System.Numerics;
+
 namespace Voile;
 
+public struct Glyph
+{
+    public int TextureId { get; set; } = -1;
+    public float Width { get; set; }
+    public float Height { get; set; }
+    public Vector2 Bearing { get; set; }
+    public int Advance { get; set; }
+
+    public Glyph() { }
+}
+
 /// <summary>
 /// Represents font data.
 /// </summary>
@@ -18,4 +31,24 @@ public class Font : Resource
     {
         Buffer = buffer;
     }
+
+    public void Measure(string text)
+    {
+        foreach (char c in text)
+        {
+
+        }
+    }
+
+    internal void AddGlyph(char c, Glyph glyph)
+    {
+        _glyphs.Add(c, glyph);
+    }
+
+    internal void GetGlyphBoundingBox(Glyph glyph)
+    {
+
+    }
+
+    private Dictionary<char, Glyph> _glyphs = new();
 }

Voile/Source/Resources/Loaders/FontLoader.cs

@@ -1,6 +1,13 @@
 
+using System.Numerics;
+using System.Runtime.InteropServices;
+using FreeTypeSharp;
 using Voile.VFS;
 
+using static FreeTypeSharp.FT;
+using static FreeTypeSharp.FT_LOAD;
+using static FreeTypeSharp.FT_Render_Mode_;
+
 namespace Voile.Resources;
 
 public class FontLoader : ResourceLoader<Font>
@@ -10,7 +17,6 @@ public class FontLoader : ResourceLoader<Font>
         ".ttf"
     };
 
-
     protected override Font LoadResource(string path)
     {
         using Stream stream = VirtualFileSystem.Read(path);
@@ -21,6 +27,68 @@ public class FontLoader : ResourceLoader<Font>
 
         result.BufferSize = bytesRead;
 
+        LoadFaceData(result);
+
         return result;
     }
+
+    private unsafe void LoadFaceData(Font font)
+    {
+        LoadFreeType();
+
+        fixed (FT_LibraryRec_** lib = &_lib)
+        {
+            fixed (FT_FaceRec_* face = &_face)
+            {
+                FT_Error error;
+
+                var buffer = new Memory<byte>(font.Buffer);
+                var handle = buffer.Pin();
+
+                error = FT_New_Memory_Face(*lib, (byte*)handle.Pointer, (nint)font.BufferSize, 0, &face);
+                error = FT_Set_Pixel_Sizes(face, 0, (uint)font.Size);
+
+                error = FT_Select_Charmap(face, FT_Encoding_.FT_ENCODING_UNICODE);
+
+                uint gid;
+                var charcode = FT_Get_First_Char(face, &gid);
+
+                while (gid != 0)
+                {
+                    Console.WriteLine($"Codepoint: {(char)charcode}, gid {gid}");
+                    charcode = FT_Get_Next_Char(face, charcode, &gid);
+                }
+
+                error = FT_Load_Char(face, 'F', FT_LOAD_NO_BITMAP);
+
+                var metrics = face->glyph->metrics;
+
+                font.AddGlyph('F', new Glyph()
+                {
+                    Width = metrics.width >> 6,
+                    Height = metrics.height >> 6,
+                    Bearing = new Vector2(metrics.horiBearingX >> 6, metrics.horiBearingY >> 6),
+                    Advance = (int)metrics.horiAdvance >> 6,
+                });
+
+                FT_Done_Face(face);
+                FT_Done_FreeType(*lib);
+            }
+        }
+    }
+
+    private unsafe void LoadFreeType()
+    {
+        fixed (FT_LibraryRec_** lib = &_lib)
+        {
+            FT_Error error;
+            if (_lib == null)
+            {
+                error = FT_Init_FreeType(lib);
+            }
+        }
+    }
+
+    private unsafe FT_LibraryRec_* _lib;
+    private unsafe FT_FaceRec_ _face;
 }

Voile/Source/UI/UISystem.cs

@@ -31,7 +31,11 @@ public class UISystem : IUpdatableSystem, IRenderableSystem
         _elements = elements;
     }
 
-    public void AddElement(UIElement element) => _elements.Add(element);
+    public void AddElement(UIElement element)
+    {
+        _elements.Add(element);
+        _inputElementIndices.Add(element.GlobalPosition, _elements.Count - 1);
+    }
     public void RemoveElement(UIElement element) => _elements.Remove(element);
 
     public void Update(double deltaTime)
@@ -167,5 +171,7 @@ public class UISystem : IUpdatableSystem, IRenderableSystem
     private List<UIElement> _elements = new();
     private InputSystem _input;
 
+    private GridSet<int> _inputElementIndices = new();
+
     private Vector2 _lastMousePosition = Vector2.Zero;
 }

Voile/Voile.csproj

@@ -9,6 +9,7 @@
     </PropertyGroup>
 
     <ItemGroup>
+        <PackageReference Include="FreeTypeSharp" Version="3.0.0" />
         <PackageReference Include="Silk.NET.WebGPU" Version="2.20.0" />
         <PackageReference Include="Silk.NET.WebGPU.Native.WGPU" Version="2.20.0" />
         <PackageReference Include="Silk.NET.Windowing" Version="2.20.0" />
@@ -16,8 +17,6 @@
         <PackageReference Include="Tommy" Version="3.1.2" />
         <PackageReference Include="ImGui.NET" Version="1.89.4" />
         <PackageReference Include="Raylib-cs" Version="7.0.1" />
-        <PackageReference Include="SharpFont" Version="4.0.1" />
-        <PackageReference Include="SixLabors.Fonts" Version="1.0.0-beta19" />
         <PackageReference Include="StbImageSharp" Version="2.27.13" />
         <PackageReference Include="StbVorbisSharp" Version="1.22.4" />
     </ItemGroup>