private void UpdateString()
{
var chars = new List <Vertex>(3 * _str.Length);
var split = _str.Split(new[] { '\n' }, StringSplitOptions.None);
var prevY = 0f;
for (int i = 0; i < split.Length; i++)
{
var prevX = 0f;
var leftPadding = TextAlignment == Alignment.LEFT ? 0 : (TextAlignment == Alignment.RIGHT ? -Font.GetStringWidth(split[i]) : -Font.GetStringWidth(split[i]) / 2);
prevY -= Font.CharHeight;
foreach (var c in split[i])
{
var u = Font.GetUFor(c);
chars.AddRange(new Vertex[]
{
new Vertex(new Vector3(prevX + leftPadding, prevY + Font.CharHeight, 0f), new Vector2(u, 0)),
new Vertex(new Vector3(prevX + leftPadding, prevY, 0f), new Vector2(u, Font.CharTextureHeight)),
new Vertex(new Vector3(prevX + leftPadding + Font.CharWidth, prevY + Font.CharHeight, 0f), new Vector2(u + Font.CharTextureLength, 0)),
new Vertex(new Vector3(prevX + leftPadding + Font.CharWidth, prevY + Font.CharHeight, 0f), new Vector2(u + Font.CharTextureLength, 0)),
new Vertex(new Vector3(prevX + leftPadding, prevY, 0f), new Vector2(u, Font.CharTextureHeight)),
new Vertex(new Vector3(prevX + leftPadding + Font.CharWidth, prevY, 0f), new Vector2(u + Font.CharTextureLength, Font.CharTextureHeight)),
});
prevX += Font.CharWidth;
}
}
if (_vbo == null)
{
_vbo = new Vbo();
}
_vbo.Bind();
var charsArray = chars.ToArray();
_trianglesCount = charsArray.Length;
_vbo.SetData(charsArray);
_vbo.Unbind();
if (_vao == null)
{
_vao = new Vao <Vertex>();
}
_vao.BindVbo(_vbo, Shader, new[] {
new VertexAttribute("_pos", 3, VertexAttribPointerType.Float, Vector2.SizeInBytes + Vector3.SizeInBytes, 0),
new VertexAttribute("_uv", 2, VertexAttribPointerType.Float, Vector2.SizeInBytes + Vector3.SizeInBytes, Vector3.SizeInBytes),
});
}
public void LoadInGl(Shader shader)
{
var vertices = Vertices.ToArray();
_vbo = new Vbo();
_vbo.Bind();
_vbo.SetData(vertices);
_vbo.Unbind();
VerticesCount = vertices.Length;
_vao = new Vao <Vertex>();
_vao.BindVbo(_vbo, shader, new[] {
new VertexAttribute("_pos", 3, VertexAttribPointerType.Float, Vector2.SizeInBytes + Vector3.SizeInBytes, 0),
new VertexAttribute("_uv", 2, VertexAttribPointerType.Float, Vector2.SizeInBytes + Vector3.SizeInBytes, Vector3.SizeInBytes),
});
ClearVertices();
}