Struct Gl 

struct Gl {
    gen_framebuffers: unsafe extern "C" fn(c_int, *mut u32),
    delete_framebuffers: unsafe extern "C" fn(c_int, *const u32),
    bind_framebuffer: unsafe extern "C" fn(u32, u32),
    framebuffer_texture_2d: unsafe extern "C" fn(u32, u32, u32, u32, c_int),
    gen_textures: unsafe extern "C" fn(c_int, *mut u32),
    delete_textures: unsafe extern "C" fn(c_int, *const u32),
    bind_texture: unsafe extern "C" fn(u32, u32),
    tex_image_2d: unsafe extern "C" fn(u32, c_int, c_int, c_int, c_int, c_int, u32, u32, *const c_void),
    tex_parameteri: unsafe extern "C" fn(u32, u32, c_int),
    check_framebuffer_status: unsafe extern "C" fn(u32) -> u32,
}

GL entry points, resolved once.

Only the handful needed to own a framebuffer; mpv resolves everything else it needs through get_proc_address.

Fields

gen_framebuffers: unsafe extern "C" fn(c_int, *mut u32)

delete_framebuffers: unsafe extern "C" fn(c_int, *const u32)

bind_framebuffer: unsafe extern "C" fn(u32, u32)

framebuffer_texture_2d: unsafe extern "C" fn(u32, u32, u32, u32, c_int)

gen_textures: unsafe extern "C" fn(c_int, *mut u32)

delete_textures: unsafe extern "C" fn(c_int, *const u32)

bind_texture: unsafe extern "C" fn(u32, u32)

tex_image_2d: unsafe extern "C" fn(u32, c_int, c_int, c_int, c_int, c_int, u32, u32, *const c_void)

tex_parameteri: unsafe extern "C" fn(u32, u32, c_int)

check_framebuffer_status: unsafe extern "C" fn(u32) -> u32

Implementations

impl Gl

unsafe fn load() -> Option<Self>

Resolve every entry point, or none — a partially-loaded table would fail later at a call site with no context.

The transmutes are unannotated on purpose: each target type is declared once on the struct field above, and repeating it at the call site would be two places to get the same signature wrong.