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Added TextureFont class. Right now it can Load and Print fonts. Missing documentation. Slow.

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the_fiddler 2007-10-20 10:31:59 +00:00
parent 3416fc515d
commit 7ddf81df81
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Source/OpenTK/Fonts/TextureFont.cs Normal file
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using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Text;
using OpenTK.Math;
using OpenTK.OpenGL;
using System.Drawing.Imaging;
using OpenTK.Platform;
namespace OpenTK.Fonts
{
public class TextureFont
{
Font font;
Dictionary<char, LoadedGlyph> loaded_glyphs = new Dictionary<char, LoadedGlyph>(36);
Graphics gfx;
struct LoadedGlyph
{
public int List;
public float Width, Height;
}
static int texture;
static TexturePacker<Glyph> pack;
static int texture_width, texture_height;
public TextureFont(Font font)
{
if (font == null)
throw new ArgumentNullException("font", "Argument to TextureFont constructor cannot be null.");
this.font = font;
if (pack == null)
{
// Calculate the size of the texture packer. We want a power-of-two size
// that is less than 1024 (supported in Geforce256-era cards), but large
// enough to hold at least 256 (16*16) font glyphs.
int size = (int)(font.Size*16);
size = (int)System.Math.Pow(2.0, System.Math.Ceiling(System.Math.Log((double)size, 2.0)));
if (size > 1024)
size = 1024;
PrepareTexturePacker(size, size);
gfx = Graphics.FromImage(new Bitmap(1, 1));
}
}
/// <summary>
/// Not ready yet.
/// </summary>
/// <param name="width"></param>
/// <param name="height"></param>
private void PrepareTexturePacker(int width, int height)
{
texture_width = width;
texture_height = height;
pack = new TexturePacker<Glyph>(texture_width, texture_height);
GL.GenTextures(1, out texture);
GL.BindTexture(GL.Enums.TextureTarget.TEXTURE_2D, texture);
GL.TexParameter(GL.Enums.TextureTarget.TEXTURE_2D, GL.Enums.TextureParameterName.TEXTURE_MIN_FILTER, (int)GL.Enums.All.LINEAR);
GL.TexParameter(GL.Enums.TextureTarget.TEXTURE_2D, GL.Enums.TextureParameterName.TEXTURE_MAG_FILTER, (int)GL.Enums.All.LINEAR);
byte[] data = new byte[texture_height * texture_width * 4];
GL.TexImage2D(GL.Enums.TextureTarget.TEXTURE_2D, 0, 4, texture_width, texture_height, 0,
GL.Enums.PixelFormat.RGBA, GL.Enums.PixelType.UNSIGNED_BYTE, data);
}
public void LoadGlyphs(string glyphs)
{
foreach (char c in glyphs)
{
if (!loaded_glyphs.ContainsKey(c))
LoadGlyph(c);
}
}
private LoadedGlyph LoadGlyph(char c)
{
Glyph g = new Glyph(c, font);
Rectangle rect = pack.Add(g);
using (Bitmap bmp = new Bitmap(g.Width, g.Height))
using (Graphics gfx = Graphics.FromImage(bmp))
{
// Upload texture and create Display List:
gfx.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
gfx.Clear(Color.Transparent);
gfx.DrawString(g.Character.ToString(), g.Font, Brushes.White, 0.0f, 0.0f);
BitmapData data = bmp.LockBits(new Rectangle(0, 0, g.Width, g.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
GL.TexSubImage2D(GL.Enums.TextureTarget.TEXTURE_2D, 0, rect.Left, rect.Top, rect.Width, rect.Height,
GL.Enums.PixelFormat.RGBA, GL.Enums.PixelType.UNSIGNED_BYTE, data.Scan0);
bmp.UnlockBits(data);
float left = rect.Left / (float)texture_width;
float bottom = rect.Bottom / (float)texture_height;
float right = rect.Right / (float)texture_width;
float top = rect.Top / (float)texture_height;
float width = (rect.Right - rect.Left); // / (float)screen_width;
float height = (rect.Top - rect.Bottom); // / (float)screen_height;
//width /= 2.0f;
LoadedGlyph lg = new LoadedGlyph();
lg.List = GL.GenLists(1);
GL.NewList(lg.List, GL.Enums.ListMode.COMPILE);
//GL.PushAttrib(GL.Enums.AttribMask.ALL_ATTRIB_BITS);
GL.Enable(GL.Enums.EnableCap.BLEND);
GL.BlendFunc(GL.Enums.BlendingFactorSrc.ONE, GL.Enums.BlendingFactorDest.ONE_MINUS_SRC_ALPHA);
GL.Begin(GL.Enums.BeginMode.QUADS);
GL.TexCoord2(left, top);
GL.Vertex2(0.375f, 0.375f);
GL.TexCoord2(right, top);
GL.Vertex2(0.375f + 2 * width, 0.375f);
GL.TexCoord2(right, bottom);
GL.Vertex2(0.375f + 2 * width, 0.375f + 2 * height);
GL.TexCoord2(left, bottom);
GL.Vertex2(0.375f, 0.375f + 2 * height);
GL.End();
GL.PopAttrib();
GL.EndList();
lg.Width = 2 * width;
lg.Height = 2 * height;
loaded_glyphs.Add(g.Character, lg);
return lg;
}
}
float[] viewport = new float[6];
public void Print(char c)
{
LoadedGlyph lg;
GL.GetFloat(GL.Enums.GetPName.VIEWPORT, viewport);
GL.PushMatrix();
GL.Scale(1.0f / (viewport[2] - viewport[0]), 1.0f / (viewport[3] - viewport[1]), 1.0f);
if (loaded_glyphs.TryGetValue(c, out lg))
{
GL.CallList(lg.List);
}
else
{
GL.CallList(LoadGlyph(c).List);
}
GL.PopMatrix();
}
public void Print(string str)
{
GL.GetFloat(GL.Enums.GetPName.VIEWPORT, viewport);
GL.PushMatrix();
GL.Scale(1.0f / (viewport[2] - viewport[0]), 1.0f / (viewport[3] - viewport[1]), 1.0f);
LoadGlyphs(str);
int i = 0;
foreach (char c in str)
{
LoadedGlyph lg = loaded_glyphs[c];
GL.CallList(lg.List);
//GL.Translate(lg.Width, 0.0f, 0.0f);
float width = gfx.MeasureString(str.Substring(i, 1), font, 256, StringFormat.GenericTypographic).Width;
if (width == 0.0f) width = 8.0f; // Spacebar.
GL.Translate(2 * width, 0.0f, 0.0f);
++i;
}
GL.PopMatrix();
}
public void Print(string format, params object[] args)
{
Print(String.Format(format, args));
}
public float LineSpacing
{
get { return font.Height; }
}
}
}