Hello Zhuyie, *> 1. From the comments in ftsdf.c, [...]*
The implementation only supports single channel SDF. So the documentation for ` FT_RENDER_MODE_SDF ` is correct. Thanks though, the comment might need some editing. *> 2. Are there any tutorials about [...]* The output is a pretty basic SDF, there is a comment on how to convert the output values to unsigned pixel values ( https://gitlab.freedesktop.org/freetype/freetype/-/blob/master/include/freetype/freetype.h#L3324 ). As for tutorial, you can use the `ftsdf` demo program implementation in the shaders. It should work exactly the same. https://gitlab.freedesktop.org/freetype/freetype-demos/-/blob/master/src/ftsdf.c#L598 Thanks, Anuj
