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#![cfg(all(target_os = "linux", feature = "window"))]
use BuilderAttribs;
use CreationError;
use GlRequest;
use Api;
use libc;
use std::ffi::CString;
use std::{mem, ptr};
use api::x11::ffi;
pub struct Context {
display: *mut ffi::Display,
window: ffi::Window,
context: ffi::GLXContext,
}
// TODO: remove me
fn with_c_str<F, T>(s: &str, f: F) -> T where F: FnOnce(*const libc::c_char) -> T {
use std::ffi::CString;
let c_str = CString::new(s.as_bytes().to_vec()).unwrap();
f(c_str.as_ptr())
}
impl Context {
pub fn new(builder: BuilderAttribs, display: *mut ffi::Display, window: ffi::Window,
fb_config: ffi::glx::types::GLXFBConfig, mut visual_infos: ffi::glx::types::XVisualInfo)
-> Result<Context, CreationError>
{
// creating GL context
let (context, extra_functions) = unsafe {
let mut attributes = Vec::new();
match builder.gl_version {
GlRequest::Latest => {},
GlRequest::Specific(Api::OpenGl, (major, minor)) => {
attributes.push(ffi::glx_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
attributes.push(major as libc::c_int);
attributes.push(ffi::glx_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
attributes.push(minor as libc::c_int);
},
GlRequest::Specific(_, _) => panic!("Only OpenGL is supported"),
GlRequest::GlThenGles { opengl_version: (major, minor), .. } => {
attributes.push(ffi::glx_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
attributes.push(major as libc::c_int);
attributes.push(ffi::glx_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
attributes.push(minor as libc::c_int);
},
}
if builder.gl_debug {
attributes.push(ffi::glx_extra::CONTEXT_FLAGS_ARB as libc::c_int);
attributes.push(ffi::glx_extra::CONTEXT_DEBUG_BIT_ARB as libc::c_int);
}
attributes.push(0);
// loading the extra GLX functions
let extra_functions = ffi::glx_extra::Glx::load_with(|addr| {
with_c_str(addr, |s| {
ffi::glx::GetProcAddress(s as *const u8) as *const libc::c_void
})
});
let share = if let Some(win) = builder.sharing {
match win.x.context {
::api::x11::Context::Glx(ref c) => c.context,
_ => panic!("Cannot share contexts between different APIs")
}
} else {
ptr::null()
};
let mut context = if extra_functions.CreateContextAttribsARB.is_loaded() {
extra_functions.CreateContextAttribsARB(display as *mut ffi::glx_extra::types::Display,
fb_config, share, 1, attributes.as_ptr())
} else {
ptr::null()
};
if context.is_null() {
context = ffi::glx::CreateContext(display as *mut _, &mut visual_infos, share, 1)
}
if context.is_null() {
return Err(CreationError::OsError(format!("GL context creation failed")));
}
(context, extra_functions)
};
// vsync
if builder.vsync {
unsafe { ffi::glx::MakeCurrent(display as *mut _, window, context) };
if extra_functions.SwapIntervalEXT.is_loaded() {
// this should be the most common extension
unsafe {
extra_functions.SwapIntervalEXT(display as *mut _, window, 1);
}
// checking that it worked
if builder.strict {
let mut swap = unsafe { mem::uninitialized() };
unsafe {
ffi::glx::QueryDrawable(display as *mut _, window,
ffi::glx_extra::SWAP_INTERVAL_EXT as i32,
&mut swap);
}
if swap != 1 {
return Err(CreationError::OsError(format!("Couldn't setup vsync: expected \
interval `1` but got `{}`", swap)));
}
}
// GLX_MESA_swap_control is not official
/*} else if extra_functions.SwapIntervalMESA.is_loaded() {
unsafe {
extra_functions.SwapIntervalMESA(1);
}*/
} else if extra_functions.SwapIntervalSGI.is_loaded() {
unsafe {
extra_functions.SwapIntervalSGI(1);
}
} else if builder.strict {
return Err(CreationError::OsError(format!("Couldn't find any available vsync extension")));
}
unsafe { ffi::glx::MakeCurrent(display as *mut _, 0, ptr::null()) };
}
Ok(Context {
display: display,
window: window,
context: context,
})
}
pub fn make_current(&self) {
let res = unsafe { ffi::glx::MakeCurrent(self.display as *mut _, self.window, self.context) };
if res == 0 {
panic!("glx::MakeCurrent failed");
}
}
pub fn is_current(&self) -> bool {
unsafe { ffi::glx::GetCurrentContext() == self.context }
}
pub fn get_proc_address(&self, addr: &str) -> *const () {
let addr = CString::new(addr.as_bytes()).unwrap();
let addr = addr.as_ptr();
unsafe {
ffi::glx::GetProcAddress(addr as *const _) as *const ()
}
}
pub fn swap_buffers(&self) {
unsafe {
ffi::glx::SwapBuffers(self.display as *mut _, self.window)
}
}
pub fn get_api(&self) -> ::Api {
::Api::OpenGl
}
}
unsafe impl Send for Context {}
unsafe impl Sync for Context {}
impl Drop for Context {
fn drop(&mut self) {
use std::ptr;
unsafe {
// we don't call MakeCurrent(0, 0) because we are not sure that the context
// is still the current one
ffi::glx::DestroyContext(self.display as *mut _, self.context);
}
}
}
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