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Cleaner GL creation on X11

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This commit is contained in:
Pierre Krieger 2014-08-07 17:53:41 +02:00
parent 2184e5e578
commit 5d997b618f
2 changed files with 54 additions and 2 deletions
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45
src/x11/mod.rs
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@ -139,7 +139,24 @@ impl Window {
wm_delete_window
};
// creating
// getting the pointer to glXCreateContextAttribs
let create_context_attribs = unsafe {
let mut addr = unsafe { ffi::glXGetProcAddress(b"glXCreateContextAttribs".as_ptr()
as *const u8) } as *const ();
if addr.is_null() {
addr = unsafe { ffi::glXGetProcAddress(b"glXCreateContextAttribsARB".as_ptr()
as *const u8) } as *const ();
}
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 = unsafe { mem::transmute(addr) };
addr
})
};
// creating IM
let im = unsafe {
let im = ffi::XOpenIM(display, ptr::null(), ptr::mut_null(), ptr::mut_null());
if im.is_null() {
@ -164,7 +181,31 @@ impl Window {
// creating GL context
let context = unsafe {
ffi::glXCreateContext(display, &visual_infos, ptr::null(), 1)
let mut attributes = Vec::new();
if builder.gl_version.is_some() {
let version = builder.gl_version.as_ref().unwrap();
attributes.push(ffi::GLX_CONTEXT_MAJOR_VERSION);
attributes.push(version.val0() as libc::c_int);
attributes.push(ffi::GLX_CONTEXT_MINOR_VERSION);
attributes.push(version.val1() as libc::c_int);
}
attributes.push(0);
let context = if create_context_attribs.is_some() {
let create_context_attribs = create_context_attribs.unwrap();
create_context_attribs(display, fb_config, ptr::null(), 1,
attributes.as_ptr())
} else {
ffi::glXCreateNewContext(display, fb_config, ffi::GLX_RGBA_TYPE, ptr::null(), 1)
};
if context.is_null() {
return Err(format!("GL context creation failed"));
}
context
};
// returning