xeekworx / bitmapfonts Goto Github PK

An OpenGL loader exists in the project as xwfglad; basically using dav1d's glad with the prefixes changed so that they don't collide with any library user's glad (if they use it).

If the xwfont_library is built as a shared library (intended for use in C# tools in the future) then the included glad loader needs to actually be utilized so the OpenGL functions used by the NanoVG or future OpenGL rendering backends aren't bad pointers.

It currently works for static builds, because it relies on the library user to load enough of OpenGL for the library to work. It is technically their responsibility. I've not designed the xwfont_library to work outside of static builds unless it's for font generation in future tools that I haven't built yet.

So far just SDL and NanoVG renderers exist. I would like to also have an OpenGL renderer (granted NanoVG somewhat covers that already). After this is added, eventually I'll be able to add Signed Distance Field features to the font, but those features will be ignored / unused in the SDL and NanoVG renderers.

To create a new renderer for OpenGL, look at renderer_nanovg for clues on what to do. You derive from renderer_base and make sure these functions are overridden (the top three being the most important):

• on_create_image
• on_destroy_image
• on_draw_image
• on_draw_line
• on_draw_rect
• on_fill_rect

If you do not implement on_draw_line, on_draw_rect, and on_fill_rect, be sure to still override those functions, but not do anything within them. The disadvantage is if I implement a feature that needs them (glyph backgrounds, underlined, or strikeout) then that feature just will not render.