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The lost art of 3D rendering without shaders
This is a great walkthrough -- wish I'd had this when I was writing similar code about ten years ago!
Bug 28549 – Gamma-corrected alpha blending for text output
Patch to Cairo do alpha-blending (more or less) correctly for text. I'm somewhat tempted to use this in GARStow's packages, although it's a bit clunky.
to alpha blending cairo fonts gamma graphics rendering text to-package ... on 13 September 2015
freetype-gl - OpenGL texture font using vertex buffer and freetype - Google Project Hosting
I like the packing images.
to font graphics opengl rendering software text ... on 22 September 2011
Treatise on Font Rasterisation
Good overview of what you need to do to get font rendering reasonably correct. The lesson, approximately, is that most of the suite gets it right by default these days.
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tasty by Adam Sampson.