draw
fun GuiGraphics.drawTriangle(x0: Float, y0: Float, x1: Float, y1: Float, x2: Float, y2: Float, fillColor: Color4b? = Color4b.TRANSPARENT, outlineColor: Color4b? = Color4b.TRANSPARENT, cull: Boolean = true)
fun GuiGraphics.drawTriangle(p1: Vec2, p2: Vec2, p3: Vec2, fillColor: Color4b? = Color4b.TRANSPARENT, outlineColor: Color4b? = Color4b.TRANSPARENT)