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Fix glXCreateContextAttrib always null

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This commit is contained in:
Pierre Krieger
2014-08-07 18:03:56 +02:00
parent 76ebf39bcd
commit d3e3590b84
1 changed files with 25 additions and 11 deletions
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34
src/x11/mod.rs
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@@ -141,19 +141,33 @@ impl Window {
// getting the pointer to glXCreateContextAttribs // getting the pointer to glXCreateContextAttribs
let create_context_attribs = unsafe { let create_context_attribs = unsafe {
let mut addr = unsafe { ffi::glXGetProcAddress(b"glXCreateContextAttribs".as_ptr() // creating the dummy context
as *const u8) } as *const (); let dummy_context =
ffi::glXCreateContext(display, &visual_infos, ptr::null(), 1);
ffi::glXMakeCurrent(display, window, dummy_context);
if addr.is_null() { // getting the pointer
addr = unsafe { ffi::glXGetProcAddress(b"glXCreateContextAttribsARB".as_ptr() let fn_ptr = {
let mut addr = unsafe { ffi::glXGetProcAddress(b"glXCreateContextAttribs".as_ptr()
as *const u8) } as *const (); as *const u8) } as *const ();
}
addr.to_option().map(|addr| { if addr.is_null() {
let addr: extern "system" fn(*mut ffi::Display, ffi::GLXFBConfig, ffi::GLXContext, addr = unsafe { ffi::glXGetProcAddress(b"glXCreateContextAttribsARB".as_ptr()
ffi::Bool, *const libc::c_int) -> ffi::GLXContext = unsafe { mem::transmute(addr) }; as *const u8) } as *const ();
addr }
})
addr.to_option().map(|addr| {
let addr: extern "system" fn(*mut ffi::Display, ffi::GLXFBConfig, ffi::GLXContext,
ffi::Bool, *const libc::c_int) -> ffi::GLXContext = mem::transmute(addr);
addr
})
};
// cleaning up
ffi::glXMakeCurrent(ptr::mut_null(), 0, ptr::null());
ffi::glXDestroyContext(display, dummy_context);
fn_ptr
}; };
// creating IM // creating IM