// TODO Support Kerning Pairs
internal static TextureFont CreateFromFile(string filename)
{
// TODO: Convert to binary format at some stage for improved loadtimes
Font font = null;
Texture2D fontTexture = null;
XmlSerializer serializer = new XmlSerializer(typeof(Font));
var fi = new FileInfo(filename);
using (FileStream stream = new FileStream(filename, FileMode.Open))
{
font = (Font)serializer.Deserialize(stream);
var texture = font.Info.Face;
var pages = font.Pages.Count();
if (pages != 1)
{
throw new NotImplementedException("TODO Support multiple pages!");
}
var dir = fi.DirectoryName;
fontTexture = Texture2D.CreateFromFile(dir + "/" + font.Pages[0].File);
}
var rv = new TextureFont
{
Font = font,
FontTexture = fontTexture
};
// Construct char dictionary
for (int i = 0; i < font.Chars.Length; i++)
{
rv.CharLookup.Add(font.Chars[i].Id, font.Chars[i]);
}
return(rv);
}
public void DrawText(string text, Vector2 position, TextureFont font, Vector4 color, TextureUnits textureUnit = TextureUnits.GL_TEXTURE0, int layer = 0)
{
// TODO? Make a seperate FontBatcher?
// See http://www.angelcode.com/products/bmfont/doc/render_text.html
// To improve the rendering...
var fontSheetWidth = (float)font.Font.Common.ScaleW;
var fontSheetHeight = (float)font.Font.Common.ScaleH;
for (int i = 0; i < text.Length; i++)
{
var quad = new QuadRecord();
quad.X = 32 + i * 32 + 16 * i + position.X;
quad.Y = 32 + (2 * i) + position.Y;
quad.W = 32;
quad.H = 32;
// Compute the U, V and UW, UH values
var charId = (byte)text[i];
var fontChar = font.CharLookup[charId];
quad.U = fontChar.X / fontSheetWidth;
quad.V = fontChar.Y / fontSheetHeight;
quad.UW = fontChar.Width / fontSheetWidth;
quad.VH = fontChar.Height / fontSheetHeight;
PushQuad(quad);
}
var device = GameWindow.GraphicsDevice;
var sX = 2 / (float)GameWindow.ScreenWidth;
var sY = 2 / (float)GameWindow.ScreenHeight;
var oX = -1;
var oY = 1;
var quadCount = m_quadRecordCount;
// Edit Vertex Data
for (int i = 0; i < quadCount; i++)
{
var record = quadRecords[i];
m_Verticies[i * 4 + 0].Position = new Vector3(oX + (record.X + record.W) * sX, oY - (record.Y + record.H) * sY, 0.0f); // Top Right
m_Verticies[i * 4 + 1].Position = new Vector3(oX + (record.X + record.W) * sX, oY - (record.Y * sY), 0.0f); // Bottom Right
m_Verticies[i * 4 + 2].Position = new Vector3(oX + record.X * sX, oY - (record.Y * sY), 0.0f); // Bottom Left
m_Verticies[i * 4 + 3].Position = new Vector3(oX + record.X * sX, oY - (record.Y + record.H) * sY, 0.0f); // Top Left
m_Verticies[i * 4 + 0].Texture = new Vector2(record.U + record.UW, record.V + record.VH); // Note: Inverted Y
m_Verticies[i * 4 + 1].Texture = new Vector2(record.U + record.UW, record.V);
m_Verticies[i * 4 + 2].Texture = new Vector2(record.U, record.V);
m_Verticies[i * 4 + 3].Texture = new Vector2(record.U, record.V + record.VH);
}
m_VertexArrayObject.UpdateVertexData <DefaultQuadBatchVertex>(m_Verticies, 0, quadCount * 6);
// TODO Make a font.glsl shader
// GlBindings.PolygonMode(Face.GL_FRONT_AND_BACK, Mode.GL_LINE);
GameWindow.GraphicsDevice.BindTexture2D(font.FontTexture.TextureId, OpenGL.TextureUnits.GL_TEXTURE0);
GameWindow.GraphicsDevice.BindTexture2D(0, OpenGL.TextureUnits.GL_TEXTURE1);
GameWindow.GraphicsDevice.BindShaderProgram(GameWindow.QuadBatchShader.ShaderProgramId);
GameWindow.QuadBatchShader.SetUniform("texture1", 0);
GlBindings.BindVertexArray(m_VertexArrayObject.VaoId);
GlBindings.DrawElements(PrimitiveType.TriangleList, quadCount * 6, DrawElementsType.UnsignedInt, 0);
GlBindings.BindVertexArray(0);
m_quadRecordCount = 0;
}
