public TextBox() : base(typeof(TextBox))
{
textRenderer = CoreEngine.gEngine.TextRender;
textCanvas = textRenderer.CreateCanvas();
textCanvas.alignHorizontal = TextAlignHorizontal.Left;
textCanvas.alignVertical = TextAlignVertical.Center;
}
private Matrix4 CalculatePosition(TextCanvas textCanvas, RectTransform transform)
{
Vector3 location = Vector3.Zero;
switch (textCanvas.alignVertical)
{
case TextAlignVertical.Bottom:
location.Y = transform.Min.Y;
break;
case TextAlignVertical.Top:
location.Y = (transform.Max.Y - textCanvas.Heigth * textCanvas.Scale);
break;
case TextAlignVertical.Center:
location.Y = (transform.Min.Y + transform.Max.Y - textCanvas.Heigth * textCanvas.Scale) * 0.5f;
break;
}
switch (textCanvas.alignHorizontal)
{
case TextAlignHorizontal.Left:
location.X = transform.Min.X;
break;
case TextAlignHorizontal.Right:
location.X = (transform.Max.X - textCanvas.Width * textCanvas.Scale);
break;
case TextAlignHorizontal.Center:
location.X = (transform.Min.X + transform.Max.X - textCanvas.Width * textCanvas.Scale) * 0.5f;
break;
}
return(Matrix4.CreateTranslation(location));
}
public void CloneTo(TextCanvas obj)
{
obj.alignHorizontal = alignHorizontal;
obj.alignVertical = alignVertical;
obj.Text = Text;
obj.StringLength = StringLength;
obj.Position = Position;
obj.Scale = Scale;
obj.colour = colour;
obj.Length = Length;
obj.Width = Width;
obj.Heigth = Heigth;
}
internal TextCanvas CreateCanvas()
{
int VAO = GL.GenVertexArray();
int VBO = GL.GenBuffer();
GL.BindVertexArray(VAO);
GL.BindBuffer(BufferTarget.ArrayBuffer, VBO);
GL.EnableVertexAttribArray(0);
GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, 5 * 4, 0);
GL.EnableVertexAttribArray(1);
GL.VertexAttribPointer(1, 2, VertexAttribPointerType.Float, false, 5 * 4, 3 * 4);
GL.BindVertexArray(0);
var canvas = new TextCanvas(VAO, VBO);
texts.Add(canvas);
GL.BindBuffer(BufferTarget.ArrayBuffer, VBO);
GL.BufferData(BufferTarget.ArrayBuffer, 1000 * 4, IntPtr.Zero, BufferUsageHint.DynamicDraw);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
return(canvas);
}
internal void UnloadText(TextCanvas canvas)
{
texts.Remove(canvas);
GL.DeleteVertexArray(canvas.VAO);
GL.DeleteBuffer(canvas.VBO);
}
public void UpdateText(TextCanvas canvas)
{
GL.ActiveTexture(TextureUnit.Texture0);
charmap.BindTexture();
float[] vertices = new float[6 * 5 * canvas.Text.Length];
int x = 0;
int y = 0;
int i = 0;
canvas.Width = 0;
canvas.Heigth = 0;
float rowHeigth = 0;
foreach (var c in canvas.Text)
{
if (c == 8381)
{
continue;
}
//move to new line
if (c == '\n' || c == '\r')
{
x = 0;
y -= size;
continue;
}
var chr = GetCharacter(c);
float xpos = x + chr.Bearing.X;
float ypos = y - (chr.Size.Y - chr.Bearing.Y);
float w = chr.Size.X;
float h = chr.Size.Y;
//update text size
if (y == 0 && rowHeigth < chr.Size.Y - y)
{
rowHeigth = chr.Size.Y - y;
}
if (canvas.Width < xpos + w)
{
canvas.Width = xpos + w;
}
float[] verts =
{
xpos, ypos + h, 0, chr.Position.X, chr.Position.Y,
xpos, ypos, 0, chr.Position.X, chr.Position.Y + chr.Size.Y / mapSize,
xpos + w, ypos, 0, chr.Position.X + chr.Size.X / mapSize, chr.Position.Y + chr.Size.Y / mapSize,
xpos, ypos + h, 0, chr.Position.X, chr.Position.Y,
xpos + w, ypos, 0, chr.Position.X + chr.Size.X / mapSize, chr.Position.Y + chr.Size.Y / mapSize,
xpos + w, ypos + h, 0, chr.Position.X + chr.Size.X / mapSize, chr.Position.Y
};
Array.Copy(verts, 0, vertices, i, verts.Length);
x += (chr.Advance >> 6);
i += 30;
}
canvas.Heigth = rowHeigth - y;
for (int n = 1; n < vertices.Length; n += 5)
{
vertices[n] -= y;
}
GL.BindBuffer(BufferTarget.ArrayBuffer, canvas.VBO);
GL.BufferSubData(BufferTarget.ArrayBuffer, IntPtr.Zero, vertices.Length * 4, vertices);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
canvas.StringLength = canvas.Text.Length;
}
