#![cfg(all(target_os = "linux", feature = "window"))]
use BuilderAttribs;
use ContextError;
use CreationError;
use GlContext;
use GlProfile;
use GlRequest;
use Api;
use PixelFormat;
use Robustness;
use libc;
use std::ffi::{CStr, CString};
use std::{mem, ptr};
use api::x11::ffi;
use platform::Window as PlatformWindow;
pub struct Context {
glx: ffi::glx::Glx,
display: *mut ffi::Display,
window: ffi::Window,
context: ffi::GLXContext,
}
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(glx: ffi::glx::Glx, 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>
{
let share = if let Some(win) = builder.sharing {
match win {
&PlatformWindow::X(ref win) => match win.x.context {
::api::x11::Context::Glx(ref c) => c.context,
_ => panic!("Cannot share contexts between different APIs")
},
_ => panic!("Cannot use glx on a non-X11 window.")
}
} else {
ptr::null()
};
let extensions = unsafe {
let extensions = glx.QueryExtensionsString(display as *mut _, 0); let extensions = CStr::from_ptr(extensions).to_bytes().to_vec();
String::from_utf8(extensions).unwrap()
};
let extra_functions = ffi::glx_extra::Glx::load_with(|addr| {
with_c_str(addr, |s| {
unsafe { glx.GetProcAddress(s as *const u8) as *const _ }
})
});
let context = match builder.gl_version {
GlRequest::Latest => {
if let Ok(ctxt) = create_context(&glx, &extra_functions, &extensions, (3, 2),
builder.gl_profile, builder.gl_debug,
builder.gl_robustness, share,
display, fb_config, &mut visual_infos)
{
ctxt
} else if let Ok(ctxt) = create_context(&glx, &extra_functions, &extensions, (3, 1),
builder.gl_profile, builder.gl_debug,
builder.gl_robustness, share, display,
fb_config, &mut visual_infos)
{
ctxt
} else {
try!(create_context(&glx, &extra_functions, &extensions, (1, 0),
builder.gl_profile, builder.gl_debug, builder.gl_robustness,
share, display, fb_config, &mut visual_infos))
}
},
GlRequest::Specific(Api::OpenGl, (major, minor)) => {
try!(create_context(&glx, &extra_functions, &extensions, (major, minor),
builder.gl_profile, builder.gl_debug, builder.gl_robustness,
share, display, fb_config, &mut visual_infos))
},
GlRequest::Specific(_, _) => panic!("Only OpenGL is supported"),
GlRequest::GlThenGles { opengl_version: (major, minor), .. } => {
try!(create_context(&glx, &extra_functions, &extensions, (major, minor),
builder.gl_profile, builder.gl_debug, builder.gl_robustness,
share, display, fb_config, &mut visual_infos))
},
};
if builder.vsync {
unsafe { glx.MakeCurrent(display as *mut _, window, context) };
if extra_functions.SwapIntervalEXT.is_loaded() {
unsafe {
extra_functions.SwapIntervalEXT(display as *mut _, window, 1);
}
if builder.strict {
let mut swap = unsafe { mem::uninitialized() };
unsafe {
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)));
}
}
} 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 { glx.MakeCurrent(display as *mut _, 0, ptr::null()) };
}
Ok(Context {
glx: glx,
display: display,
window: window,
context: context,
})
}
}
impl GlContext for Context {
unsafe fn make_current(&self) -> Result<(), ContextError> {
let res = self.glx.MakeCurrent(self.display as *mut _, self.window, self.context);
if res == 0 {
panic!("glx::MakeCurrent failed");
}
Ok(())
}
fn is_current(&self) -> bool {
unsafe { self.glx.GetCurrentContext() == self.context }
}
fn get_proc_address(&self, addr: &str) -> *const libc::c_void {
let addr = CString::new(addr.as_bytes()).unwrap();
let addr = addr.as_ptr();
unsafe {
self.glx.GetProcAddress(addr as *const _) as *const _
}
}
fn swap_buffers(&self) -> Result<(), ContextError> {
unsafe { self.glx.SwapBuffers(self.display as *mut _, self.window); }
Ok(())
}
fn get_api(&self) -> ::Api {
::Api::OpenGl
}
fn get_pixel_format(&self) -> PixelFormat {
unimplemented!();
}
}
unsafe impl Send for Context {}
unsafe impl Sync for Context {}
impl Drop for Context {
fn drop(&mut self) {
unsafe {
if self.is_current() {
self.glx.MakeCurrent(self.display as *mut _, 0, ptr::null_mut());
}
self.glx.DestroyContext(self.display as *mut _, self.context);
}
}
}
fn create_context(glx: &ffi::glx::Glx, extra_functions: &ffi::glx_extra::Glx, extensions: &str,
version: (u8, u8), profile: Option<GlProfile>, debug: bool,
robustness: Robustness, share: ffi::GLXContext, display: *mut ffi::Display,
fb_config: ffi::glx::types::GLXFBConfig,
visual_infos: &mut ffi::glx::types::XVisualInfo)
-> Result<ffi::GLXContext, CreationError>
{
unsafe {
let context = if extra_functions.CreateContextAttribsARB.is_loaded() {
let mut attributes = Vec::with_capacity(9);
attributes.push(ffi::glx_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
attributes.push(version.0 as libc::c_int);
attributes.push(ffi::glx_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
attributes.push(version.1 as libc::c_int);
if let Some(profile) = profile {
let flag = match profile {
GlProfile::Compatibility =>
ffi::glx_extra::CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
GlProfile::Core =>
ffi::glx_extra::CONTEXT_CORE_PROFILE_BIT_ARB,
};
attributes.push(ffi::glx_extra::CONTEXT_PROFILE_MASK_ARB as libc::c_int);
attributes.push(flag as libc::c_int);
}
let flags = {
let mut flags = 0;
if extensions.split(' ').find(|&i| i == "GLX_ARB_create_context_robustness").is_some() {
match robustness {
Robustness::RobustNoResetNotification | Robustness::TryRobustNoResetNotification => {
attributes.push(ffi::glx_extra::CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB as libc::c_int);
attributes.push(ffi::glx_extra::NO_RESET_NOTIFICATION_ARB as libc::c_int);
flags = flags | ffi::glx_extra::CONTEXT_ROBUST_ACCESS_BIT_ARB as libc::c_int;
},
Robustness::RobustLoseContextOnReset | Robustness::TryRobustLoseContextOnReset => {
attributes.push(ffi::glx_extra::CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB as libc::c_int);
attributes.push(ffi::glx_extra::LOSE_CONTEXT_ON_RESET_ARB as libc::c_int);
flags = flags | ffi::glx_extra::CONTEXT_ROBUST_ACCESS_BIT_ARB as libc::c_int;
},
Robustness::NotRobust => (),
Robustness::NoError => (),
}
} else {
match robustness {
Robustness::RobustNoResetNotification | Robustness::RobustLoseContextOnReset => {
return Err(CreationError::NotSupported);
},
_ => ()
}
}
if debug {
flags = flags | ffi::glx_extra::CONTEXT_DEBUG_BIT_ARB as libc::c_int;
}
flags
};
attributes.push(ffi::glx_extra::CONTEXT_FLAGS_ARB as libc::c_int);
attributes.push(flags);
attributes.push(0);
extra_functions.CreateContextAttribsARB(display as *mut _, fb_config, share, 1,
attributes.as_ptr())
} else {
glx.CreateContext(display as *mut _, visual_infos, share, 1)
};
if context.is_null() {
return Err(CreationError::OsError(format!("GL context creation failed")));
}
Ok(context)
}
}