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Added TextureFont class. Right now it can Load and Print fonts. Missing documentation. Slow.
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the_fiddler
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3416fc515d
commit
7ddf81df81
204
Source/OpenTK/Fonts/TextureFont.cs
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204
Source/OpenTK/Fonts/TextureFont.cs
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Drawing;
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using System.Drawing.Text;
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using OpenTK.Math;
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using OpenTK.OpenGL;
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using System.Drawing.Imaging;
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using OpenTK.Platform;
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namespace OpenTK.Fonts
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{
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public class TextureFont
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{
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Font font;
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Dictionary<char, LoadedGlyph> loaded_glyphs = new Dictionary<char, LoadedGlyph>(36);
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Graphics gfx;
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struct LoadedGlyph
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{
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public int List;
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public float Width, Height;
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}
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static int texture;
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static TexturePacker<Glyph> pack;
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static int texture_width, texture_height;
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public TextureFont(Font font)
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{
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if (font == null)
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throw new ArgumentNullException("font", "Argument to TextureFont constructor cannot be null.");
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this.font = font;
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if (pack == null)
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{
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// Calculate the size of the texture packer. We want a power-of-two size
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// that is less than 1024 (supported in Geforce256-era cards), but large
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// enough to hold at least 256 (16*16) font glyphs.
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int size = (int)(font.Size*16);
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size = (int)System.Math.Pow(2.0, System.Math.Ceiling(System.Math.Log((double)size, 2.0)));
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if (size > 1024)
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size = 1024;
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PrepareTexturePacker(size, size);
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gfx = Graphics.FromImage(new Bitmap(1, 1));
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}
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}
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/// <summary>
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/// Not ready yet.
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/// </summary>
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/// <param name="width"></param>
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/// <param name="height"></param>
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private void PrepareTexturePacker(int width, int height)
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{
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texture_width = width;
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texture_height = height;
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pack = new TexturePacker<Glyph>(texture_width, texture_height);
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GL.GenTextures(1, out texture);
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GL.BindTexture(GL.Enums.TextureTarget.TEXTURE_2D, texture);
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GL.TexParameter(GL.Enums.TextureTarget.TEXTURE_2D, GL.Enums.TextureParameterName.TEXTURE_MIN_FILTER, (int)GL.Enums.All.LINEAR);
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GL.TexParameter(GL.Enums.TextureTarget.TEXTURE_2D, GL.Enums.TextureParameterName.TEXTURE_MAG_FILTER, (int)GL.Enums.All.LINEAR);
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byte[] data = new byte[texture_height * texture_width * 4];
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GL.TexImage2D(GL.Enums.TextureTarget.TEXTURE_2D, 0, 4, texture_width, texture_height, 0,
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GL.Enums.PixelFormat.RGBA, GL.Enums.PixelType.UNSIGNED_BYTE, data);
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}
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public void LoadGlyphs(string glyphs)
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{
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foreach (char c in glyphs)
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{
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if (!loaded_glyphs.ContainsKey(c))
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LoadGlyph(c);
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}
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}
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private LoadedGlyph LoadGlyph(char c)
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{
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Glyph g = new Glyph(c, font);
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Rectangle rect = pack.Add(g);
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using (Bitmap bmp = new Bitmap(g.Width, g.Height))
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using (Graphics gfx = Graphics.FromImage(bmp))
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{
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// Upload texture and create Display List:
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gfx.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
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gfx.Clear(Color.Transparent);
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gfx.DrawString(g.Character.ToString(), g.Font, Brushes.White, 0.0f, 0.0f);
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BitmapData data = bmp.LockBits(new Rectangle(0, 0, g.Width, g.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
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GL.TexSubImage2D(GL.Enums.TextureTarget.TEXTURE_2D, 0, rect.Left, rect.Top, rect.Width, rect.Height,
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GL.Enums.PixelFormat.RGBA, GL.Enums.PixelType.UNSIGNED_BYTE, data.Scan0);
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bmp.UnlockBits(data);
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float left = rect.Left / (float)texture_width;
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float bottom = rect.Bottom / (float)texture_height;
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float right = rect.Right / (float)texture_width;
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float top = rect.Top / (float)texture_height;
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float width = (rect.Right - rect.Left); // / (float)screen_width;
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float height = (rect.Top - rect.Bottom); // / (float)screen_height;
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//width /= 2.0f;
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LoadedGlyph lg = new LoadedGlyph();
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lg.List = GL.GenLists(1);
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GL.NewList(lg.List, GL.Enums.ListMode.COMPILE);
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//GL.PushAttrib(GL.Enums.AttribMask.ALL_ATTRIB_BITS);
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GL.Enable(GL.Enums.EnableCap.BLEND);
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GL.BlendFunc(GL.Enums.BlendingFactorSrc.ONE, GL.Enums.BlendingFactorDest.ONE_MINUS_SRC_ALPHA);
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GL.Begin(GL.Enums.BeginMode.QUADS);
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GL.TexCoord2(left, top);
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GL.Vertex2(0.375f, 0.375f);
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GL.TexCoord2(right, top);
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GL.Vertex2(0.375f + 2 * width, 0.375f);
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GL.TexCoord2(right, bottom);
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GL.Vertex2(0.375f + 2 * width, 0.375f + 2 * height);
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GL.TexCoord2(left, bottom);
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GL.Vertex2(0.375f, 0.375f + 2 * height);
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GL.End();
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GL.PopAttrib();
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GL.EndList();
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lg.Width = 2 * width;
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lg.Height = 2 * height;
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loaded_glyphs.Add(g.Character, lg);
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return lg;
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}
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}
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float[] viewport = new float[6];
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public void Print(char c)
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{
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LoadedGlyph lg;
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GL.GetFloat(GL.Enums.GetPName.VIEWPORT, viewport);
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GL.PushMatrix();
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GL.Scale(1.0f / (viewport[2] - viewport[0]), 1.0f / (viewport[3] - viewport[1]), 1.0f);
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if (loaded_glyphs.TryGetValue(c, out lg))
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{
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GL.CallList(lg.List);
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}
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else
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{
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GL.CallList(LoadGlyph(c).List);
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}
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GL.PopMatrix();
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}
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public void Print(string str)
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{
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GL.GetFloat(GL.Enums.GetPName.VIEWPORT, viewport);
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GL.PushMatrix();
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GL.Scale(1.0f / (viewport[2] - viewport[0]), 1.0f / (viewport[3] - viewport[1]), 1.0f);
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LoadGlyphs(str);
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int i = 0;
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foreach (char c in str)
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{
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LoadedGlyph lg = loaded_glyphs[c];
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GL.CallList(lg.List);
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//GL.Translate(lg.Width, 0.0f, 0.0f);
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float width = gfx.MeasureString(str.Substring(i, 1), font, 256, StringFormat.GenericTypographic).Width;
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if (width == 0.0f) width = 8.0f; // Spacebar.
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GL.Translate(2 * width, 0.0f, 0.0f);
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++i;
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}
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GL.PopMatrix();
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}
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public void Print(string format, params object[] args)
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{
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Print(String.Format(format, args));
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}
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public float LineSpacing
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{
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get { return font.Height; }
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}
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}
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}
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