private void Update(EvaluationContext context)
{
var text = Text.GetValue(context);
var bufferSize = BufferSize.GetValue(context);
var wrapText = WrapText.GetValue(context);
var textOffset = TextOffset.GetValue(context);
var columns = bufferSize.Width;
var rows = bufferSize.Height;
if (columns <= 0 || rows <= 0)
{
return;
}
if (string.IsNullOrEmpty(text))
{
return;
}
var textCycle = (int)textOffset.X + (int)(textOffset.Y) * columns;
var size = rows * columns;
if (_bufferContent == null || _bufferContent.Length != size)
{
_bufferContent = new BufferLayout[size];
}
var index = 0;
char c;
var highlightChars = HighlightCharacters.GetValue(context);
for (var rowIndex = 0; rowIndex < rows; rowIndex++)
{
for (var columnIndex = 0; columnIndex < columns; columnIndex++)
{
if (wrapText)
{
var i = (index + textCycle) % text.Length;
if (i < 0)
{
i += text.Length;
}
c = text[i];
}
else
{
var i = index + textCycle;
var indexIsValid = i >= 0 && i < text.Length;
c = indexIsValid ? text[i] : ' ';
}
var highlight = highlightChars.IndexOf(c) > -1 ? 1f : 0; // oh, that's slow!
_bufferContent[index] = new BufferLayout(
pos: new Vector2((float)columnIndex / columns, 1 - (float)rowIndex / rows),
uv: new Vector2(c % 16, (c >> 4)),
highlight: highlight);
index++;
}
}
ResourceManager.Instance().SetupStructuredBuffer(_bufferContent, ref Buffer.Value);
Buffer.Value.DebugName = nameof(TypoGridBuffer);
VertexCount.Value = size * 6;
}
