public FontRenderer(Font font)
{
Font = font;
charHeight = -Font.Height;
GlyphBitmap = new Bitmap(TextureSize.Width, TextureSize.Height);
texture = new Texture(GL.GenTexture());
GL.BindTexture(TextureTarget.Texture2D, texture.GetId());
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)All.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)All.Linear);
using (Graphics gfx = Graphics.FromImage(GlyphBitmap))
{
//this supposedly improves perforance
//Application.SetCompatibleTextRenderingDefault(false);
StringFormat format = new StringFormat(StringFormat.GenericTypographic);
Point charPoint = new Point(0, 0);
for (int i = 0; i < chars.Length; i++)
{
SizeF charSizeF = gfx.MeasureString(new string(new Char[1] { Convert.ToChar(i) }), Font, 0, format);
Size charSize = new Size((int)Math.Ceiling(charSizeF.Width), (int)Math.Ceiling(charSizeF.Height));
//fudge factor to prevent glyphs from overlapping
charSize.Width += 2;
if (charSize.Width + charPoint.X > TextureSize.Width)
{
charPoint.X = 0;
charPoint.Y += (int)Math.Ceiling(Font.GetHeight());
}
chars[i] = new CharData(new Rectangle(charPoint, charSize), this);
charPoint.X += charSize.Width;
}
gfx.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;
gfx.Clear(Color.Transparent);
for (int i = 0; i < chars.Length; i++)
{
PointF point = new PointF(chars[i].PixelRegion.X, chars[i].PixelRegion.Y);
gfx.DrawString(new string(new Char[1] { Convert.ToChar(i) }), Font, new SolidBrush(Color.Black), point);
}
}
BitmapData data = GlyphBitmap.LockBits(new Rectangle(0, 0, GlyphBitmap.Width, GlyphBitmap.Height), ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, TextureSize.Width, TextureSize.Height, 0, Format, PixelType.UnsignedByte, data.Scan0);
GlyphBitmap.UnlockBits(data);
}
private void LoadImage()
{
try
{
using (Bitmap file = new Bitmap(Filename))
{
LoadImage(file);
}
}
catch (FileNotFoundException)
{
Debug.Assert(false, "Texture missing.");
_texture = _textureMissing;
}
}
private void LoadImage(Bitmap image)
{
int texID = GL.GenTexture();
GL.BindTexture(TextureTarget.Texture2D, texID);
BitmapData data = image.LockBits(new Rectangle(0, 0, image.Width, image.Height),
ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, data.Width, data.Height, 0,
OpenTK.Graphics.OpenGL.PixelFormat.Bgra, PixelType.UnsignedByte, data.Scan0);
image.UnlockBits(data);
GL.GenerateMipmap(GenerateMipmapTarget.Texture2D);
_texture = new Texture(texID);
}