We recommend that you generate a bitmap texture of your font and then render specific letters by generating polygons with the correct texture coordinates from this texture. This has the benefit of allowing anti-aliasing from texture filtering and is quite simple to implement.
All geometry needs to be rendered as triangles under OpenGL ES, so if vectors are essential then pre-tesselating your letters is preferable to on the fly tesselation. Efficient on-the-fly tesselation is very complicated.
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