start implementing MSDF
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2e890fd696
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ad5c88aa52
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using System.Runtime.CompilerServices;
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namespace MoonWorks.Graphics.Font
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{
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/* UTF-8 Decoder */
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/* Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
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* See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details.
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*/
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public static class Decoder
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{
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static byte[] utf8d = new byte[] {
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 00..1f
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 20..3f
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 40..5f
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 60..7f
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, // 80..9f
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, // a0..bf
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8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, // c0..df
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0xa,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x4,0x3,0x3, // e0..ef
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0xb,0x6,0x6,0x6,0x5,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8, // f0..ff
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0x0,0x1,0x2,0x3,0x5,0x8,0x7,0x1,0x1,0x1,0x4,0x6,0x1,0x1,0x1,0x1, // s0..s0
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,0,1,0,1,1,1,1,1,1, // s1..s2
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1,2,1,1,1,1,1,2,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1, // s3..s4
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1,2,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,3,1,3,1,1,1,1,1,1, // s5..s6
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1,3,1,1,1,1,1,3,1,3,1,1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1, // s7..s8
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};
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static unsafe uint Decode(uint* state, uint* codep, uint dbyte) {
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uint type = utf8d[dbyte];
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*codep = (uint) ((*state != 0) ?
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(dbyte & 0x3fu) | (*codep << 6) :
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(0xff >> (int) type) & (dbyte));
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*state = utf8d[256 + *state*16 + type];
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return *state;
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}
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}
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}
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@ -0,0 +1,58 @@
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using System;
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using System.IO;
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using System.Text.Json;
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namespace MoonWorks.Graphics.Font.MSDF;
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public class Font : IDisposable
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{
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public Texture Texture { get; }
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internal AtlasData AtlasData;
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static JsonSerializerOptions SerializerOptions = new JsonSerializerOptions
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{
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PropertyNameCaseInsensitive = true,
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IncludeFields = true
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};
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static AtlasDataContext Context = new AtlasDataContext(SerializerOptions);
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private bool IsDisposed;
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public static Font Load(
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GraphicsDevice graphicsDevice,
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CommandBuffer commandBuffer,
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string jsonPath
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) {
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var atlasData = (AtlasData) JsonSerializer.Deserialize(File.ReadAllText(jsonPath), typeof(AtlasData), Context);
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var imagePath = Path.ChangeExtension(jsonPath, ".png");
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var texture = Texture.FromImageFile(graphicsDevice, commandBuffer, imagePath);
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return new Font(texture, atlasData);
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}
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private Font(Texture texture, AtlasData atlasData)
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{
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Texture = texture;
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AtlasData = atlasData;
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}
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protected virtual void Dispose(bool disposing)
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{
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if (!IsDisposed)
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{
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if (disposing)
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{
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Texture.Dispose();
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}
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IsDisposed = true;
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}
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}
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public void Dispose()
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{
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// Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
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Dispose(disposing: true);
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GC.SuppressFinalize(this);
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}
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}
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@ -0,0 +1,85 @@
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using System.Text.Json.Serialization;
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using MoonWorks.Math.Float;
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namespace MoonWorks.Graphics.Font.MSDF;
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[JsonSerializable(typeof(AtlasData))]
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internal partial class AtlasDataContext : JsonSerializerContext
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{
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}
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// Reads from an atlas generated by msdf-atlas-gen
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public struct AtlasData
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{
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public Atlas Atlas;
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public Metrics Metrics;
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public Glyph[] Glyphs;
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}
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public struct Atlas
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{
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public FieldType Type;
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public int DistanceRange;
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public int Size;
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public int Width;
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public int Height;
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public Origin YOrigin;
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}
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public struct Metrics
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{
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public int EmSize;
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public float LineHeight;
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public float Ascender;
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public float Descender;
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public float UnderlineY;
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public float UnderlineThickness;
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}
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public struct Glyph
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{
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public uint Unicode;
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public float Advance;
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public Bounds PlaneBounds;
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public Bounds AtlasBounds;
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}
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public struct Bounds
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{
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public float Left;
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public float Bottom;
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public float Right;
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public float Top;
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}
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public enum FieldType
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{
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Hardmask,
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Softmask,
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SDF,
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PSDF,
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MSDF,
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MTSDF
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}
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public enum Origin
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{
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Top,
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Bottom
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}
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public struct FontVertex : IVertexType
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{
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public Vector3 Position;
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public Vector2 TexCoord;
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public Color Color;
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private static readonly VertexElementFormat[] vertexElementFormats = new VertexElementFormat[]
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{
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VertexElementFormat.Vector3,
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VertexElementFormat.Vector2,
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VertexElementFormat.Color
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};
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public static VertexElementFormat[] Formats => vertexElementFormats;
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}
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@ -0,0 +1,188 @@
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using System;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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namespace MoonWorks.Graphics.Font.MSDF;
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public unsafe class TextBatch : IDisposable
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{
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public const int MAX_CHARS = 4096;
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public const int MAX_VERTICES = MAX_CHARS * 4;
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public const int MAX_INDICES = MAX_CHARS * 6;
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public GraphicsDevice GraphicsDevice;
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public Font Font;
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public Buffer VertexBuffer;
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public Buffer IndexBuffer;
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public byte* VertexData;
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public byte* IndexData;
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private int CurrentVertexDataLengthInBytes;
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private int CurrentIndexDataLengthInBytes;
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private byte* StringBytes;
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private int StringBytesCount = 16;
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private bool IsDisposed;
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public TextBatch(GraphicsDevice graphicsDevice)
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{
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GraphicsDevice = graphicsDevice;
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}
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public void Start()
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{
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VertexBuffer = Buffer.Create<FontVertex>(GraphicsDevice, BufferUsageFlags.Vertex, MAX_VERTICES);
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IndexBuffer = Buffer.Create<uint>(GraphicsDevice, BufferUsageFlags.Index, MAX_INDICES);
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VertexData = (byte*) NativeMemory.Alloc((nuint) (MAX_VERTICES * Unsafe.SizeOf<FontVertex>()));
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IndexData = (byte*) NativeMemory.Alloc((nuint) (MAX_INDICES * Unsafe.SizeOf<uint>()));
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StringBytes = (byte*) NativeMemory.Alloc(128);
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}
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public void AddText(
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string text,
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float x,
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float y,
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float depth,
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Color color,
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HorizontalAlignment horizontalAlignment = HorizontalAlignment.Left,
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VerticalAlignment verticalAlignment = VerticalAlignment.Baseline
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) {
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uint decodeState;
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uint codepoint;
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var byteCount = System.Text.Encoding.UTF8.GetByteCount(text);
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if (StringBytesCount < byteCount)
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{
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StringBytes = (byte*) NativeMemory.Realloc(StringBytes, (nuint) byteCount);
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StringBytesCount = byteCount;
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}
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fixed (char* chars = text)
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{
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var bytesWritten = System.Text.Encoding.UTF8.GetBytes(chars, text.Length, StringBytes, byteCount);
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y += GetVerticalAlignOffset(verticalAlignment);
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if (horizontalAlignment == HorizontalAlignment.Right)
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{
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// TODO: check text bounds to adjust alignment
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}
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for (var i = 0; i < bytesWritten; i += 1)
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{
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if (Decoder.Decode(&decodeState, &codepoint, StringBytes[i]) > 0)
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{
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if (decodeState == 1)
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{
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// Something went wrong!
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return;
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}
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continue;
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}
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// TODO: we need to convert AtlasData so that codepoints are looked up by key
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if (IsWhitespace(codepoint))
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{
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x += GetHorizontalAdvance(codepoint);
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continue;
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}
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}
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// TODO: draw the rest of the owl
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}
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}
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// Call this after you have made all the Draw calls you want.
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public void UploadBufferData(CommandBuffer commandBuffer)
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{
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if (CurrentVertexDataLengthInBytes > 0 && CurrentIndexDataLengthInBytes > 0)
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{
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commandBuffer.SetBufferData(VertexBuffer, (nint) VertexData, 0, (uint) CurrentVertexDataLengthInBytes);
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commandBuffer.SetBufferData(IndexBuffer, (nint) IndexData, 0, (uint) CurrentIndexDataLengthInBytes);
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}
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}
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private float GetHorizontalAdvance(uint codepoint)
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{
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Font.AtlasData.Glyphs
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}
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private float GetVerticalAlignOffset(VerticalAlignment verticalAlignment)
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{
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switch (verticalAlignment)
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{
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case VerticalAlignment.Baseline:
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return 0;
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case VerticalAlignment.Top:
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return Font.AtlasData.Metrics.Ascender;
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case VerticalAlignment.Middle:
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return (Font.AtlasData.Metrics.Ascender + Font.AtlasData.Metrics.Descender) / 2f;
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case VerticalAlignment.Bottom:
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return Font.AtlasData.Metrics.Descender;
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default:
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return 0;
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}
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}
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private static bool IsWhitespace(uint codepoint)
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{
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switch (codepoint)
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{
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case 0x0020:
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case 0x00A0:
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case 0x1680:
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case 0x202F:
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case 0x205F:
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case 0x3000:
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return true;
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default:
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if (codepoint > 0x2000 && codepoint <= 0x200A)
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{
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return true;
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}
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return false;
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}
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}
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protected virtual void Dispose(bool disposing)
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{
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if (!IsDisposed)
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{
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if (disposing)
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{
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VertexBuffer.Dispose();
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IndexBuffer.Dispose();
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}
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NativeMemory.Free(VertexData);
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NativeMemory.Free(IndexData);
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NativeMemory.Free(StringBytes);
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IsDisposed = true;
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}
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}
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~TextBatch()
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{
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// Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
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Dispose(disposing: false);
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}
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public void Dispose()
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{
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// Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
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Dispose(disposing: true);
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GC.SuppressFinalize(this);
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}
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}
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