Simple OpenGL loader for Zig

Generate the loader

1. Update gl.xml (if necessary)
2. Open loader_gen.py
3. Line 149, change API to the one you want (gl, gles).
4. Line 150, change VERSION to the one you want
5. Run the python file.

If everything's ok, there is a file called "gl.zig" that you can use.

API

The whole gl.zig file is a structure.

const GL = @import("./gl.zig");

// not adviced as this structure holds all of the pointers to the OpenGL 
// commands.
var gl = GL {};

// loadProc must has the signature `fn([:0]const u8) ?*anyopaque`.
try gl.load(loadProc); 

// at this point, all of the OpenGL functions are loaded and can be called.
gl.clear(GL.COLOR_BUFFER_BIT);

The OpenGL functions are renamed as such:

• The gl prefix is stripped.
• The first letter is not capitalised

The OpenGL enums are renamed as such:

• The GL_ prefix is stripped.

The OpenGL types are mapped to their Zig equivalent (ie, GLenum becomes u32, GLfloat becomes f32) except :

• GLsync becomes GL.Sync (GL being the imported structure) ;
• GLDEBUGPROC becomes GL.DebugFn.