add more labels as they fit at current scale
use smoothstep interpolation for simple line shader
testing with one vertexAttribArray, this should be faster for switching polgon/line shaders
fix drawing of tile bounding box
dont add z-offset way labels
fix way too much z-offset used for roof outline
comment
draw text textures only once per string
- unify duplicate strings from different tiles (as side-effect save some bytes)
- fix 'advance by width' in texture drawing