Start splitting win32::init into multiple functions

This commit is contained in:
Pierre Krieger 2015-02-16 11:46:18 +01:00
parent 40591806dc
commit 353567b216

View file

@ -1,7 +1,10 @@
use std::sync::atomic::AtomicBool; use std::sync::atomic::AtomicBool;
use std::ptr; use std::ptr;
use std::mem;
use std::os;
use super::callback; use super::callback;
use super::Window; use super::Window;
use super::MonitorID;
use BuilderAttribs; use BuilderAttribs;
use CreationError; use CreationError;
use CreationError::OsError; use CreationError::OsError;
@ -23,9 +26,6 @@ unsafe impl Send for ContextHack {}
pub fn new_window(builder: BuilderAttribs<'static>, builder_sharelists: Option<ContextHack>) pub fn new_window(builder: BuilderAttribs<'static>, builder_sharelists: Option<ContextHack>)
-> Result<Window, CreationError> -> Result<Window, CreationError>
{ {
use std::mem;
use std::os;
// initializing variables to be sent to the task // initializing variables to be sent to the task
let title = builder.title.as_slice().utf16_units() let title = builder.title.as_slice().utf16_units()
.chain(Some(0).into_iter()).collect::<Vec<u16>>(); // title to utf16 .chain(Some(0).into_iter()).collect::<Vec<u16>>(); // title to utf16
@ -36,368 +36,14 @@ pub fn new_window(builder: BuilderAttribs<'static>, builder_sharelists: Option<C
// so we create a new thread dedicated to this window. // so we create a new thread dedicated to this window.
// This is the only safe method. Using `nosend` wouldn't work for non-native runtime. // This is the only safe method. Using `nosend` wouldn't work for non-native runtime.
::std::thread::Thread::spawn(move || { ::std::thread::Thread::spawn(move || {
let builder_sharelists = builder_sharelists.map(|s| s.0);
// registering the window class
let class_name = {
let class_name: Vec<u16> = "Window Class".utf16_units().chain(Some(0).into_iter())
.collect::<Vec<u16>>();
let class = winapi::WNDCLASSEXW {
cbSize: mem::size_of::<winapi::WNDCLASSEXW>() as winapi::UINT,
style: winapi::CS_HREDRAW | winapi::CS_VREDRAW | winapi::CS_OWNDC,
lpfnWndProc: callback::callback,
cbClsExtra: 0,
cbWndExtra: 0,
hInstance: unsafe { kernel32::GetModuleHandleW(ptr::null()) },
hIcon: ptr::null_mut(),
hCursor: ptr::null_mut(),
hbrBackground: ptr::null_mut(),
lpszMenuName: ptr::null(),
lpszClassName: class_name.as_ptr(),
hIconSm: ptr::null_mut(),
};
// We ignore errors because registering the same window class twice would trigger
// an error, and because errors here are detected during CreateWindowEx anyway.
// Also since there is no weird element in the struct, there is no reason for this
// call to fail.
unsafe { user32::RegisterClassExW(&class) };
class_name
};
// building a RECT object with coordinates
let mut rect = winapi::RECT {
left: 0, right: builder.dimensions.unwrap_or((1024, 768)).0 as winapi::LONG,
top: 0, bottom: builder.dimensions.unwrap_or((1024, 768)).1 as winapi::LONG,
};
// switching to fullscreen if necessary
// this means adjusting the window's position so that it overlaps the right monitor,
// and change the monitor's resolution if necessary
if builder.monitor.is_some() {
let monitor = builder.monitor.as_ref().unwrap();
// adjusting the rect
{
let pos = monitor.get_position();
rect.left += pos.0 as winapi::LONG;
rect.right += pos.0 as winapi::LONG;
rect.top += pos.1 as winapi::LONG;
rect.bottom += pos.1 as winapi::LONG;
}
// changing device settings
let mut screen_settings: winapi::DEVMODEW = unsafe { mem::zeroed() };
screen_settings.dmSize = mem::size_of::<winapi::DEVMODEW>() as winapi::WORD;
screen_settings.dmPelsWidth = (rect.right - rect.left) as winapi::DWORD;
screen_settings.dmPelsHeight = (rect.bottom - rect.top) as winapi::DWORD;
screen_settings.dmBitsPerPel = 32; // TODO: ?
screen_settings.dmFields = winapi::DM_BITSPERPEL | winapi::DM_PELSWIDTH | winapi::DM_PELSHEIGHT;
let result = unsafe { user32::ChangeDisplaySettingsExW(monitor.get_system_name().as_ptr(),
&mut screen_settings, ptr::null_mut(), winapi::CDS_FULLSCREEN, ptr::null_mut()) };
if result != winapi::DISP_CHANGE_SUCCESSFUL {
tx.send(Err(OsError(format!("ChangeDisplaySettings failed: {}", result))));
return;
}
}
// computing the style and extended style of the window
let (ex_style, style) = if builder.monitor.is_some() {
(winapi::WS_EX_APPWINDOW, winapi::WS_POPUP | winapi::WS_CLIPSIBLINGS | winapi::WS_CLIPCHILDREN)
} else {
(winapi::WS_EX_APPWINDOW | winapi::WS_EX_WINDOWEDGE,
winapi::WS_OVERLAPPEDWINDOW | winapi::WS_CLIPSIBLINGS | winapi::WS_CLIPCHILDREN)
};
// adjusting the window coordinates using the style
unsafe { user32::AdjustWindowRectEx(&mut rect, style, 0, ex_style) };
// getting the address of wglCreateContextAttribsARB and the pixel format
// that we will use
let (extra_functions, pixel_format) = {
// creating a dummy invisible window for GL initialization
let dummy_window = unsafe {
let handle = user32::CreateWindowExW(ex_style, class_name.as_ptr(),
title.as_ptr() as winapi::LPCWSTR,
style | winapi::WS_CLIPSIBLINGS | winapi::WS_CLIPCHILDREN,
winapi::CW_USEDEFAULT, winapi::CW_USEDEFAULT,
rect.right - rect.left, rect.bottom - rect.top,
ptr::null_mut(), ptr::null_mut(), kernel32::GetModuleHandleW(ptr::null()),
ptr::null_mut());
if handle.is_null() {
use std::os;
tx.send(Err(OsError(format!("CreateWindowEx function failed: {}",
os::error_string(os::errno() as usize)))));
return;
}
handle
};
// getting the HDC of the dummy window
let dummy_hdc = {
let hdc = unsafe { user32::GetDC(dummy_window) };
if hdc.is_null() {
tx.send(Err(OsError(format!("GetDC function failed: {}",
os::error_string(os::errno() as usize)))));
unsafe { user32::DestroyWindow(dummy_window); }
return;
}
hdc
};
// getting the pixel format that we will use
let pixel_format = {
// initializing a PIXELFORMATDESCRIPTOR that indicates what we want
let mut output: winapi::PIXELFORMATDESCRIPTOR = unsafe { mem::zeroed() };
output.nSize = mem::size_of::<winapi::PIXELFORMATDESCRIPTOR>() as winapi::WORD;
output.nVersion = 1;
output.dwFlags = winapi::PFD_DRAW_TO_WINDOW | winapi::PFD_DOUBLEBUFFER |
winapi::PFD_SUPPORT_OPENGL | winapi::PFD_GENERIC_ACCELERATED;
output.iPixelType = winapi::PFD_TYPE_RGBA;
output.cColorBits = 24;
output.cAlphaBits = 8;
output.cAccumBits = 0;
output.cDepthBits = 24;
output.cStencilBits = 8;
output.cAuxBuffers = 0;
output.iLayerType = winapi::PFD_MAIN_PLANE;
let pf_index = unsafe { gdi32::ChoosePixelFormat(dummy_hdc, &output) };
if pf_index == 0 {
tx.send(Err(OsError(format!("ChoosePixelFormat function failed: {}",
os::error_string(os::errno() as usize)))));
unsafe { user32::DestroyWindow(dummy_window); }
return;
}
if unsafe { gdi32::DescribePixelFormat(dummy_hdc, pf_index,
mem::size_of::<winapi::PIXELFORMATDESCRIPTOR>() as winapi::UINT, &mut output) } == 0
{
tx.send(Err(OsError(format!("DescribePixelFormat function failed: {}",
os::error_string(os::errno() as usize)))));
unsafe { user32::DestroyWindow(dummy_window); }
return;
}
output
};
// calling SetPixelFormat
unsafe {
if gdi32::SetPixelFormat(dummy_hdc, 1, &pixel_format) == 0 {
tx.send(Err(OsError(format!("SetPixelFormat function failed: {}",
os::error_string(os::errno() as usize)))));
user32::DestroyWindow(dummy_window);
return;
}
}
// creating the dummy OpenGL context
let dummy_context = {
let ctxt = unsafe { gl::wgl::CreateContext(dummy_hdc as *const libc::c_void) };
if ctxt.is_null() {
tx.send(Err(OsError(format!("wglCreateContext function failed: {}",
os::error_string(os::errno() as usize)))));
unsafe { user32::DestroyWindow(dummy_window); }
return;
}
ctxt
};
// making context current
unsafe { gl::wgl::MakeCurrent(dummy_hdc as *const libc::c_void, dummy_context); }
// loading the extra WGL functions
let extra_functions = gl::wgl_extra::Wgl::load_with(|addr| {
use libc;
let addr = CString::from_slice(addr.as_bytes());
let addr = addr.as_slice_with_nul().as_ptr();
unsafe {
gl::wgl::GetProcAddress(addr) as *const libc::c_void
}
});
// removing current context
unsafe { gl::wgl::MakeCurrent(ptr::null(), ptr::null()); }
// destroying the context and the window
unsafe { gl::wgl::DeleteContext(dummy_context); }
unsafe { user32::DestroyWindow(dummy_window); }
// returning the address
(extra_functions, pixel_format)
};
// creating the real window this time
let real_window = unsafe {
let (width, height) = if builder.monitor.is_some() || builder.dimensions.is_some() {
(Some(rect.right - rect.left), Some(rect.bottom - rect.top))
} else {
(None, None)
};
let style = if !builder.visible || builder.headless {
style
} else {
style | winapi::WS_VISIBLE
};
let handle = user32::CreateWindowExW(ex_style, class_name.as_ptr(),
title.as_ptr() as winapi::LPCWSTR,
style | winapi::WS_CLIPSIBLINGS | winapi::WS_CLIPCHILDREN,
if builder.monitor.is_some() { 0 } else { winapi::CW_USEDEFAULT },
if builder.monitor.is_some() { 0 } else { winapi::CW_USEDEFAULT },
width.unwrap_or(winapi::CW_USEDEFAULT), height.unwrap_or(winapi::CW_USEDEFAULT),
ptr::null_mut(), ptr::null_mut(), kernel32::GetModuleHandleW(ptr::null()),
ptr::null_mut());
if handle.is_null() {
use std::os;
tx.send(Err(OsError(format!("CreateWindowEx function failed: {}",
os::error_string(os::errno() as usize)))));
return;
}
handle
};
// getting the HDC of the window
let hdc = {
let hdc = unsafe { user32::GetDC(real_window) };
if hdc.is_null() {
tx.send(Err(OsError(format!("GetDC function failed: {}",
os::error_string(os::errno() as usize)))));
unsafe { user32::DestroyWindow(real_window); }
return;
}
hdc
};
// calling SetPixelFormat
unsafe {
if gdi32::SetPixelFormat(hdc, 1, &pixel_format) == 0 {
tx.send(Err(OsError(format!("SetPixelFormat function failed: {}",
os::error_string(os::errno() as usize)))));
user32::DestroyWindow(real_window);
return;
}
}
// creating the OpenGL context
let context = {
use libc;
let mut attributes = Vec::new();
if builder.gl_version.is_some() {
let version = builder.gl_version.as_ref().unwrap();
attributes.push(gl::wgl_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
attributes.push(version.0 as libc::c_int);
attributes.push(gl::wgl_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
attributes.push(version.1 as libc::c_int);
}
if builder.gl_debug {
attributes.push(gl::wgl_extra::CONTEXT_FLAGS_ARB as libc::c_int);
attributes.push(gl::wgl_extra::CONTEXT_DEBUG_BIT_ARB as libc::c_int);
}
attributes.push(0);
let ctxt = unsafe {
if extra_functions.CreateContextAttribsARB.is_loaded() {
let share = if let Some(c) = builder_sharelists { c } else { ptr::null_mut() };
extra_functions.CreateContextAttribsARB(hdc as *const libc::c_void,
share as *const libc::c_void,
attributes.as_slice().as_ptr())
} else {
let ctxt = gl::wgl::CreateContext(hdc as *const libc::c_void);
if let Some(c) = builder_sharelists {
gl::wgl::ShareLists(c as *const libc::c_void, ctxt);
};
ctxt
}
};
if ctxt.is_null() {
tx.send(Err(OsError(format!("OpenGL context creation failed: {}",
os::error_string(os::errno() as usize)))));
unsafe { user32::DestroyWindow(real_window); }
return;
}
ctxt
};
// calling SetForegroundWindow if fullscreen
if builder.monitor.is_some() {
unsafe { user32::SetForegroundWindow(real_window) };
}
// filling the WINDOW task-local storage
let events_receiver = {
let (tx, rx) = channel();
let mut tx = Some(tx);
callback::WINDOW.with(|window| {
(*window.borrow_mut()) = Some((real_window, tx.take().unwrap()));
});
rx
};
// loading the opengl32 module
let gl_library = {
let name = "opengl32.dll".utf16_units().chain(Some(0).into_iter())
.collect::<Vec<u16>>().as_ptr();
let lib = unsafe { kernel32::LoadLibraryW(name) };
if lib.is_null() {
tx.send(Err(OsError(format!("LoadLibrary function failed: {}",
os::error_string(os::errno() as usize)))));
unsafe { gl::wgl::DeleteContext(context); }
unsafe { user32::DestroyWindow(real_window); }
return;
}
lib
};
// handling vsync
if builder.vsync {
if extra_functions.SwapIntervalEXT.is_loaded() {
unsafe { gl::wgl::MakeCurrent(hdc as *const libc::c_void, context) };
if unsafe { extra_functions.SwapIntervalEXT(1) } == 0 {
tx.send(Err(OsError(format!("wglSwapIntervalEXT failed"))));
unsafe { gl::wgl::DeleteContext(context); }
unsafe { user32::DestroyWindow(real_window); }
return;
}
// it is important to remove the current context, otherwise you get very weird
// errors
unsafe { gl::wgl::MakeCurrent(ptr::null(), ptr::null()); }
}
}
// building the struct
let window = Window{
window: real_window,
hdc: hdc as winapi::HDC,
context: context as winapi::HGLRC,
gl_library: gl_library,
events_receiver: events_receiver,
is_closed: AtomicBool::new(false),
};
// sending // sending
tx.send(Ok(window)); match init(title, builder, builder_sharelists) {
Ok(w) => tx.send(Ok(w)).ok(),
Err(e) => {
tx.send(Err(e)).ok();
return;
}
};
// now that the `Window` struct is initialized, the main `Window::new()` function will // now that the `Window` struct is initialized, the main `Window::new()` function will
// return and this events loop will run in parallel // return and this events loop will run in parallel
@ -415,3 +61,368 @@ pub fn new_window(builder: BuilderAttribs<'static>, builder_sharelists: Option<C
rx.recv().unwrap() rx.recv().unwrap()
} }
fn init(title: Vec<u16>, builder: BuilderAttribs<'static>, builder_sharelists: Option<ContextHack>)
-> Result<Window, CreationError>
{
let builder_sharelists = builder_sharelists.map(|s| s.0);
// registering the window class
let class_name = register_window_class();
// building a RECT object with coordinates
let mut rect = winapi::RECT {
left: 0, right: builder.dimensions.unwrap_or((1024, 768)).0 as winapi::LONG,
top: 0, bottom: builder.dimensions.unwrap_or((1024, 768)).1 as winapi::LONG,
};
// switching to fullscreen if necessary
// this means adjusting the window's position so that it overlaps the right monitor,
// and change the monitor's resolution if necessary
if builder.monitor.is_some() {
let monitor = builder.monitor.as_ref().unwrap();
switch_to_fullscreen(&mut rect, monitor);
}
// computing the style and extended style of the window
let (ex_style, style) = if builder.monitor.is_some() {
(winapi::WS_EX_APPWINDOW, winapi::WS_POPUP | winapi::WS_CLIPSIBLINGS | winapi::WS_CLIPCHILDREN)
} else {
(winapi::WS_EX_APPWINDOW | winapi::WS_EX_WINDOWEDGE,
winapi::WS_OVERLAPPEDWINDOW | winapi::WS_CLIPSIBLINGS | winapi::WS_CLIPCHILDREN)
};
// adjusting the window coordinates using the style
unsafe { user32::AdjustWindowRectEx(&mut rect, style, 0, ex_style) };
// getting the address of wglCreateContextAttribsARB and the pixel format
// that we will use
let (extra_functions, pixel_format) = {
// creating a dummy invisible window for GL initialization
let dummy_window = unsafe {
let handle = user32::CreateWindowExW(ex_style, class_name.as_ptr(),
title.as_ptr() as winapi::LPCWSTR,
style | winapi::WS_CLIPSIBLINGS | winapi::WS_CLIPCHILDREN,
winapi::CW_USEDEFAULT, winapi::CW_USEDEFAULT,
rect.right - rect.left, rect.bottom - rect.top,
ptr::null_mut(), ptr::null_mut(), kernel32::GetModuleHandleW(ptr::null()),
ptr::null_mut());
if handle.is_null() {
return Err(OsError(format!("CreateWindowEx function failed: {}",
os::error_string(os::errno() as usize))));
}
handle
};
// getting the HDC of the dummy window
let dummy_hdc = {
let hdc = unsafe { user32::GetDC(dummy_window) };
if hdc.is_null() {
let err = Err(OsError(format!("GetDC function failed: {}",
os::error_string(os::errno() as usize))));
unsafe { user32::DestroyWindow(dummy_window); }
return err;
}
hdc
};
// getting the pixel format that we will use
let pixel_format = {
// initializing a PIXELFORMATDESCRIPTOR that indicates what we want
let mut output: winapi::PIXELFORMATDESCRIPTOR = unsafe { mem::zeroed() };
output.nSize = mem::size_of::<winapi::PIXELFORMATDESCRIPTOR>() as winapi::WORD;
output.nVersion = 1;
output.dwFlags = winapi::PFD_DRAW_TO_WINDOW | winapi::PFD_DOUBLEBUFFER |
winapi::PFD_SUPPORT_OPENGL | winapi::PFD_GENERIC_ACCELERATED;
output.iPixelType = winapi::PFD_TYPE_RGBA;
output.cColorBits = 24;
output.cAlphaBits = 8;
output.cAccumBits = 0;
output.cDepthBits = 24;
output.cStencilBits = 8;
output.cAuxBuffers = 0;
output.iLayerType = winapi::PFD_MAIN_PLANE;
let pf_index = unsafe { gdi32::ChoosePixelFormat(dummy_hdc, &output) };
if pf_index == 0 {
let err = Err(OsError(format!("ChoosePixelFormat function failed: {}",
os::error_string(os::errno() as usize))));
unsafe { user32::DestroyWindow(dummy_window); }
return err;
}
if unsafe { gdi32::DescribePixelFormat(dummy_hdc, pf_index,
mem::size_of::<winapi::PIXELFORMATDESCRIPTOR>() as winapi::UINT, &mut output) } == 0
{
let err = Err(OsError(format!("DescribePixelFormat function failed: {}",
os::error_string(os::errno() as usize))));
unsafe { user32::DestroyWindow(dummy_window); }
return err;
}
output
};
// calling SetPixelFormat
unsafe {
if gdi32::SetPixelFormat(dummy_hdc, 1, &pixel_format) == 0 {
let err = Err(OsError(format!("SetPixelFormat function failed: {}",
os::error_string(os::errno() as usize))));
user32::DestroyWindow(dummy_window);
return err;
}
}
// creating the dummy OpenGL context
let dummy_context = {
let ctxt = unsafe { gl::wgl::CreateContext(dummy_hdc as *const libc::c_void) };
if ctxt.is_null() {
let err = Err(OsError(format!("wglCreateContext function failed: {}",
os::error_string(os::errno() as usize))));
unsafe { user32::DestroyWindow(dummy_window); }
return err;
}
ctxt
};
// making context current
unsafe { gl::wgl::MakeCurrent(dummy_hdc as *const libc::c_void, dummy_context); }
// loading the extra WGL functions
let extra_functions = gl::wgl_extra::Wgl::load_with(|addr| {
use libc;
let addr = CString::from_slice(addr.as_bytes());
let addr = addr.as_slice_with_nul().as_ptr();
unsafe {
gl::wgl::GetProcAddress(addr) as *const libc::c_void
}
});
// removing current context
unsafe { gl::wgl::MakeCurrent(ptr::null(), ptr::null()); }
// destroying the context and the window
unsafe { gl::wgl::DeleteContext(dummy_context); }
unsafe { user32::DestroyWindow(dummy_window); }
// returning the address
(extra_functions, pixel_format)
};
// creating the real window this time
let real_window = unsafe {
let (width, height) = if builder.monitor.is_some() || builder.dimensions.is_some() {
(Some(rect.right - rect.left), Some(rect.bottom - rect.top))
} else {
(None, None)
};
let style = if !builder.visible || builder.headless {
style
} else {
style | winapi::WS_VISIBLE
};
let handle = user32::CreateWindowExW(ex_style, class_name.as_ptr(),
title.as_ptr() as winapi::LPCWSTR,
style | winapi::WS_CLIPSIBLINGS | winapi::WS_CLIPCHILDREN,
if builder.monitor.is_some() { 0 } else { winapi::CW_USEDEFAULT },
if builder.monitor.is_some() { 0 } else { winapi::CW_USEDEFAULT },
width.unwrap_or(winapi::CW_USEDEFAULT), height.unwrap_or(winapi::CW_USEDEFAULT),
ptr::null_mut(), ptr::null_mut(), kernel32::GetModuleHandleW(ptr::null()),
ptr::null_mut());
if handle.is_null() {
return Err(OsError(format!("CreateWindowEx function failed: {}",
os::error_string(os::errno() as usize))));
}
handle
};
// getting the HDC of the window
let hdc = {
let hdc = unsafe { user32::GetDC(real_window) };
if hdc.is_null() {
let err = Err(OsError(format!("GetDC function failed: {}",
os::error_string(os::errno() as usize))));
unsafe { user32::DestroyWindow(real_window); }
return err;
}
hdc
};
// calling SetPixelFormat
unsafe {
if gdi32::SetPixelFormat(hdc, 1, &pixel_format) == 0 {
let err = Err(OsError(format!("SetPixelFormat function failed: {}",
os::error_string(os::errno() as usize))));
user32::DestroyWindow(real_window);
return err;
}
}
// creating the OpenGL context
let context = {
use libc;
let mut attributes = Vec::new();
if builder.gl_version.is_some() {
let version = builder.gl_version.as_ref().unwrap();
attributes.push(gl::wgl_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
attributes.push(version.0 as libc::c_int);
attributes.push(gl::wgl_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
attributes.push(version.1 as libc::c_int);
}
if builder.gl_debug {
attributes.push(gl::wgl_extra::CONTEXT_FLAGS_ARB as libc::c_int);
attributes.push(gl::wgl_extra::CONTEXT_DEBUG_BIT_ARB as libc::c_int);
}
attributes.push(0);
let ctxt = unsafe {
if extra_functions.CreateContextAttribsARB.is_loaded() {
let share = if let Some(c) = builder_sharelists { c } else { ptr::null_mut() };
extra_functions.CreateContextAttribsARB(hdc as *const libc::c_void,
share as *const libc::c_void,
attributes.as_slice().as_ptr())
} else {
let ctxt = gl::wgl::CreateContext(hdc as *const libc::c_void);
if let Some(c) = builder_sharelists {
gl::wgl::ShareLists(c as *const libc::c_void, ctxt);
};
ctxt
}
};
if ctxt.is_null() {
let err = Err(OsError(format!("OpenGL context creation failed: {}",
os::error_string(os::errno() as usize))));
unsafe { user32::DestroyWindow(real_window); }
return err;
}
ctxt
};
// calling SetForegroundWindow if fullscreen
if builder.monitor.is_some() {
unsafe { user32::SetForegroundWindow(real_window) };
}
// filling the WINDOW task-local storage
let events_receiver = {
let (tx, rx) = channel();
let mut tx = Some(tx);
callback::WINDOW.with(|window| {
(*window.borrow_mut()) = Some((real_window, tx.take().unwrap()));
});
rx
};
// loading the opengl32 module
let gl_library = {
let name = "opengl32.dll".utf16_units().chain(Some(0).into_iter())
.collect::<Vec<u16>>().as_ptr();
let lib = unsafe { kernel32::LoadLibraryW(name) };
if lib.is_null() {
let err = Err(OsError(format!("LoadLibrary function failed: {}",
os::error_string(os::errno() as usize))));
unsafe { gl::wgl::DeleteContext(context); }
unsafe { user32::DestroyWindow(real_window); }
return err;
}
lib
};
// handling vsync
if builder.vsync {
if extra_functions.SwapIntervalEXT.is_loaded() {
unsafe { gl::wgl::MakeCurrent(hdc as *const libc::c_void, context) };
if unsafe { extra_functions.SwapIntervalEXT(1) } == 0 {
unsafe { gl::wgl::DeleteContext(context); }
unsafe { user32::DestroyWindow(real_window); }
return Err(OsError(format!("wglSwapIntervalEXT failed")));
}
// it is important to remove the current context, otherwise you get very weird
// errors
unsafe { gl::wgl::MakeCurrent(ptr::null(), ptr::null()); }
}
}
// building the struct
Ok(Window {
window: real_window,
hdc: hdc as winapi::HDC,
context: context as winapi::HGLRC,
gl_library: gl_library,
events_receiver: events_receiver,
is_closed: AtomicBool::new(false),
})
}
fn register_window_class() -> Vec<u16> {
let class_name: Vec<u16> = "Window Class".utf16_units().chain(Some(0).into_iter())
.collect::<Vec<u16>>();
let class = winapi::WNDCLASSEXW {
cbSize: mem::size_of::<winapi::WNDCLASSEXW>() as winapi::UINT,
style: winapi::CS_HREDRAW | winapi::CS_VREDRAW | winapi::CS_OWNDC,
lpfnWndProc: callback::callback,
cbClsExtra: 0,
cbWndExtra: 0,
hInstance: unsafe { kernel32::GetModuleHandleW(ptr::null()) },
hIcon: ptr::null_mut(),
hCursor: ptr::null_mut(),
hbrBackground: ptr::null_mut(),
lpszMenuName: ptr::null(),
lpszClassName: class_name.as_ptr(),
hIconSm: ptr::null_mut(),
};
// We ignore errors because registering the same window class twice would trigger
// an error, and because errors here are detected during CreateWindowEx anyway.
// Also since there is no weird element in the struct, there is no reason for this
// call to fail.
unsafe { user32::RegisterClassExW(&class) };
class_name
}
fn switch_to_fullscreen(rect: &mut winapi::RECT, monitor: &MonitorID) -> Result<(), CreationError> {
// adjusting the rect
{
let pos = monitor.get_position();
rect.left += pos.0 as winapi::LONG;
rect.right += pos.0 as winapi::LONG;
rect.top += pos.1 as winapi::LONG;
rect.bottom += pos.1 as winapi::LONG;
}
// changing device settings
let mut screen_settings: winapi::DEVMODEW = unsafe { mem::zeroed() };
screen_settings.dmSize = mem::size_of::<winapi::DEVMODEW>() as winapi::WORD;
screen_settings.dmPelsWidth = (rect.right - rect.left) as winapi::DWORD;
screen_settings.dmPelsHeight = (rect.bottom - rect.top) as winapi::DWORD;
screen_settings.dmBitsPerPel = 32; // TODO: ?
screen_settings.dmFields = winapi::DM_BITSPERPEL | winapi::DM_PELSWIDTH | winapi::DM_PELSHEIGHT;
let result = unsafe { user32::ChangeDisplaySettingsExW(monitor.get_system_name().as_ptr(),
&mut screen_settings, ptr::null_mut(), winapi::CDS_FULLSCREEN, ptr::null_mut()) };
if result != winapi::DISP_CHANGE_SUCCESSFUL {
return Err(OsError(format!("ChangeDisplaySettings failed: {}", result)));
}
Ok(())
}