Add todos

todo.txt

@@ -12,6 +12,12 @@ features:
 
 - function to set/clear stencil buffer -- can be useful
 
+- Create and use the same function for determining CW/CCW AND left/right vertex
+  determination in triangle drawing.
+
+- Check (and possibly fix) if any barycentric coord ever exceeds the range
+  <0,255> due to rounding errors etc.
+
 - dithered barycentric interpolation function that is faster than normal
   interpolation -- it will randomly picky one of three values, with greater
   probabilities at greater coords