cslug

Single header implementation of a preprocessing step for the Slug text rendering algorithm. Relies the stb_truetype.h for font parsing and curve retrieval.

Minimal cslug.c to compile into a library

#define STB_TRUETYPE_IMPLEMENTATION
#define CSLUG_IMPLEMENTATION
// #define CSLUG_IMPL_F16 - removes the need to link compiler-rt
#include "cslug.h"

Examples

Here are a 2 of them:

• one for using R16G16B16A16 textures to store band and curve data
• another one uses SSBO to store same data and thus is a bit more compact in memory

Examples uses raylib under the hood. Shaders are a slightly modified versions of original shaders.

Build

cc -std=c99 -o cslug_buffer example_buffer.c -I./raylib/src -L./raylib/src -lraylib -lm -lGL -g -O0
cc -std=c99 -o cslug_texture example_texture.c -I./raylib/src -L./raylib/src -lraylib -lm -lGL -g -O0

Buffer example

raylib by default uses OpenGl 3.3, but SSBO requires at least 4.3, so build it manually:

cd raylib/src
make PLATFORM=PLATFORM_DESKTOP GRAPHICS=GRAPHICS_API_OPENGL_43 RAYLIB_BUILD_MODE=Debug GLFW_LINUX_ENABLE_WAYLAND=TRUE GLFW_LINUX_ENABLE_X11=FALSE

Acknowledgements

• Official Slug example: https://github.com/EricLengyel/Slug
• raylib: https://github.com/raysan5/raylib
• stb_truetype: https://github.com/nothings/stb