msdf-c
A pure C99 multi-channel signed distance field generator. Handles MSDF bitmap generation from given ttf/otf font.
This is in an unstable state, ymmv.
Based on the C++ implementation by Viktor Chlumský.
Example of using this with GL (from my C engine)
// example fragment shader
// scale is render_width/glyph_width
// render_width being the width of each rendered glyph
float median(float r, float g, float b) {
return max(min(r, g), min(max(r, g), b));
}
void main()
{
vec3 sample = texture(u_texture, uv).rgb;
float dist = scale * (median(sample.r, sample.g, sample.b) - 0.5);
float o = clamp(dist + 0.5, 0.0, 1.0);
color = vec4(vec3(1.0), o);
}
Current issues:
-
Glyph alignment seems off[X] -
Lack of multi-byte character support[X] -
Error correction appears to be wrong (pixel clash)[X] -
Lacking a sensible API[X], and code is a bit messy