A pure, header-only, C++ software renderer, supports vertex and fragment shaders, and has a depth-buffer.
The main.cpp file contains an example demo : a cube composed of several triangles is inputed : it is transformed using classic matrix transformations in the vertex shader, then each face is colored using barycentric coordinates in the fragment shader. The depth before automatically performs the depth test (see this if statement).
SDL2 is used to open a window and access raw pixel data, this can be ditched and you can directly write a buffer to a ppm file (RGB for color buffer, Greyscale for depth) with file << buffer;. The library is expected to be installed on your system and is retrieved with pkg-config (see Makefile)