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minifb
MiniFB is a small cross platform library to create a frame buffer that you can draw pixels in
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InfluxDB
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libtcod
A collection of tools and algorithms for developing traditional roguelikes. Such as field-of-view, pathfinding, and a tile-based terminal emulator.
If you just want to push pixel data to a frame buffer then I can highly recommend minifb. MIT licensed, Supports a lot of platforms, and it’s about as simple as you can get. It also handles input if you need it, too.
SDL2 is a really good simple open-source graphics library. The core library provides things like window creation, 2D graphics rendering, keyboard, mouse, and controller support, basic audio support, basic logging, and much more. There are also a few sub-libraries that extend its functionality, like SDL_image which lets you load image files from many different file types, SDL_mixer for enhanced audio support, SDL_ttf for True Type Font support, and SDL_net for networking. You can also use OpenGL or Vulkan with it. It’s cross platform, so you can port your program to Windows, macOS, Linux, iOS, and Android fairly easily. You can find the documentation for it here: http://wiki.libsdl.org/APIByCategory
libtcod is a good library for that. The libraries main purpose is for making Roguelike games on a 2D grib, but it uses SDL or OpenGL on the backend for its graphics.