public void Draw()
{
var textGroupedByColor = textToDraw.GroupBy(t => t.Color);
// Render text sets by color
foreach (var colorGroup in textGroupedByColor)
{
commandList.SetPipeline(glyphPipeline);
commandList.SetGraphicsResourceSet(0, textPropertiesSet);
commandList.SetFramebuffer(glyphTextureFramebuffer);
commandList.ClearColorTarget(0, new RgbaFloat(0, 0, 0, 0));
var updateRect = new BoundingRectangle();
updateRect.Reset();
foreach (var drawable in colorGroup)
{
var advanceX = 0f;
for (var i = 0; i < drawable.Glyphs.Length; i++)
{
var glyphAdvanceX = drawable.Glyphs[i].AdvanceX;
// Transform letter spacing from 1 based to 0 based
glyphAdvanceX += (drawable.LetterSpacing - 1) * Font.FontSizeInPixels;
var glyphCoordsInPixels = new Vector2(advanceX, 0) + drawable.Position;
DrawGlyph(commandList, drawable.Glyphs[i].Vertices, glyphCoordsInPixels);
advanceX += glyphAdvanceX;
}
updateRect.Include(drawable.Position.X * aspectWidth / 2f,
drawable.Position.Y * aspectHeight / 2f);
updateRect.Include((drawable.Position.X + advanceX) * aspectWidth / 2f,
(drawable.Position.Y + Font.FontSizeInPixels) * aspectHeight / 2f);
}
const float paddingPixels = 1;
updateRect.Include(updateRect.StartX - (paddingPixels * aspectWidth / 2f),
updateRect.StartY - (paddingPixels * aspectHeight / 2f));
updateRect.Include(updateRect.EndX + (paddingPixels * aspectWidth / 2f),
updateRect.EndY + (paddingPixels * aspectHeight / 2f));
// 2nd pass, render everything to the framebuffer
DrawOutput(commandList, new Color(0, 0, 0, 0), false, updateRect.ToVector4());
// We need to do a second pass if we would like a color other than black text
if (colorGroup.Key != new Color(0, 0, 0, 1))
{
DrawOutput(commandList, colorGroup.Key, true, updateRect.ToVector4());
}
}
}