text.cr

private def build_vertices : Array(Vertex)
  vertices = [ ] of Vertex
  texture_size = @font.texture_for(@size).size
  baseline = 0
  
  @lines.each do |line|
    baseline += line.top
    colors = @formatter.format(line.text, @default_color)
    build_line_vertices(vertices, line, colors, baseline, texture_size)
  end
  
  vertices
end

# Inner loop split into own function.
private def build_line_vertices(vertices, line, colors, baseline, texture_size)
  prev_glyph = nil
  advance = 0
  
  line.glyphs.zip(colors) do |glyph, color|
    kerning = 0 # Ternary Conditions always have the issue of "wtf is the else? .. ah there it is *scroll*"
    kerning = @font.get_kerning(prev_glyph.code, glyph.code, @size) if prev_glyph
    
    create_glyph_vertices(vertices, glyph, color, advance, baseline, texture_size)
    
    advance += glyph.advance + kerning
    prev_glyph = glyph
  end
end