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Merge pull request #279 from tomaka/win32-correct

Browse source 
Work on the win32 implementation
This commit is contained in:
tomaka 2015-02-17 22:20:14 +01:00
parent 40591806dc 1a33c9ce9f
commit eb330030de
3 changed files with 517 additions and 366 deletions
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4
build.rs
View file

@ -22,7 +22,9 @@ fn main() {
khronos_api::WGL_XML,
vec![
"WGL_ARB_create_context".to_string(),
"WGL_EXT_swap_control".to_string()
"WGL_EXT_swap_control".to_string(),
"WGL_ARB_pixel_format".to_string(),
"WGL_ARB_framebuffer_sRGB".to_string(),
],
"1.0", "core", &mut file).unwrap();
}

53
src/lib.rs
View file

@ -170,6 +170,21 @@ pub enum MouseCursor {
RowResize,
}
/// Describes a possible format. Unused.
#[allow(missing_docs)]
pub struct PixelFormat {
pub red_bits: u8,
pub green_bits: u8,
pub blue_bits: u8,
pub alpha_bits: u8,
pub depth_bits: u8,
pub stencil_bits: u8,
pub stereoscopy: bool,
pub double_buffer: bool,
pub multisampling: Option<u16>,
pub srgb: bool,
}
/// Attributes
struct BuilderAttribs<'a> {
#[allow(dead_code)]
@ -239,5 +254,41 @@ impl<'a> BuilderAttribs<'a> {
(new_attribs, sharing)
}
}
fn choose_pixel_format<T, I>(&self, iter: I) -> (T, PixelFormat)
where I: Iterator<Item=(T, PixelFormat)>, T: Clone
{
let mut current_result = None;
// TODO: do this more properly
for (id, format) in iter {
if format.red_bits + format.green_bits + format.blue_bits < self.color_bits.unwrap_or(0) {
continue;
}
if format.alpha_bits < self.alpha_bits.unwrap_or(0) {
continue;
}
if format.depth_bits < self.depth_bits.unwrap_or(0) {
continue;
}
if format.stencil_bits < self.stencil_bits.unwrap_or(0) {
continue;
}
if !format.stereoscopy && self.stereoscopy {
continue;
}
if self.multisampling.is_some() && format.multisampling.is_none() {
continue;
}
current_result = Some((id, format));
}
current_result.expect("Could not find compliant pixel format")
}
}

826
src/win32/init.rs
View file

@ -1,10 +1,14 @@
use std::sync::atomic::AtomicBool;
use std::ptr;
use std::mem;
use std::os;
use super::callback;
use super::Window;
use super::MonitorID;
use BuilderAttribs;
use CreationError;
use CreationError::OsError;
use PixelFormat;
use std::ffi::CString;
use std::sync::mpsc::channel;
@ -23,9 +27,6 @@ unsafe impl Send for ContextHack {}
pub fn new_window(builder: BuilderAttribs<'static>, builder_sharelists: Option<ContextHack>)
-> Result<Window, CreationError>
{
use std::mem;
use std::os;
// initializing variables to be sent to the task
let title = builder.title.as_slice().utf16_units()
.chain(Some(0).into_iter()).collect::<Vec<u16>>(); // title to utf16
@ -36,368 +37,14 @@ pub fn new_window(builder: BuilderAttribs<'static>, builder_sharelists: Option<C
// 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.
::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
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
// return and this events loop will run in parallel
@ -415,3 +62,454 @@ pub fn new_window(builder: BuilderAttribs<'static>, builder_sharelists: Option<C
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 = {
let formats = enumerate_native_pixel_formats(dummy_hdc);
let (id, _) = builder.choose_pixel_format(formats.into_iter().map(|(a, b)| (b, a)));
let mut output: winapi::PIXELFORMATDESCRIPTOR = unsafe { mem::zeroed() };
if unsafe { gdi32::DescribePixelFormat(dummy_hdc, id,
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 = try!(create_context(None, dummy_hdc, None));
// making context current
unsafe { gl::wgl::MakeCurrent(dummy_hdc as *const libc::c_void, dummy_context as *const libc::c_void); }
// 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 as *const libc::c_void); }
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 = try!(create_context(Some((&extra_functions, &builder)), hdc, builder_sharelists));
// 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 = try!(load_opengl32_dll());
// handling vsync
if builder.vsync {
if extra_functions.SwapIntervalEXT.is_loaded() {
unsafe { gl::wgl::MakeCurrent(hdc as *const libc::c_void, context as *const libc::c_void) };
if unsafe { extra_functions.SwapIntervalEXT(1) } == 0 {
unsafe { gl::wgl::DeleteContext(context as *const libc::c_void); }
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,
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(())
}
fn create_context(extra: Option<(&gl::wgl_extra::Wgl, &BuilderAttribs<'static>)>,
hdc: winapi::HDC, share: Option<winapi::HGLRC>)
-> Result<winapi::HGLRC, CreationError>
{
let share = share.unwrap_or(ptr::null_mut());
let ctxt = if let Some((extra_functions, builder)) = extra {
if extra_functions.CreateContextAttribsARB.is_loaded() {
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);
Some(unsafe {
extra_functions.CreateContextAttribsARB(hdc as *const libc::c_void,
share as *const libc::c_void,
attributes.as_slice().as_ptr())
})
} else {
None
}
} else {
None
};
let ctxt = match ctxt {
Some(ctxt) => ctxt,
None => {
unsafe {
let ctxt = gl::wgl::CreateContext(hdc as *const libc::c_void);
if !share.is_null() {
gl::wgl::ShareLists(share as *const libc::c_void, ctxt);
};
ctxt
}
}
};
if ctxt.is_null() {
return Err(OsError(format!("OpenGL context creation failed: {}",
os::error_string(os::errno() as usize))));
}
Ok(ctxt as winapi::HGLRC)
}
fn enumerate_native_pixel_formats(hdc: winapi::HDC) -> Vec<(PixelFormat, libc::c_int)> {
let size_of_pxfmtdescr = mem::size_of::<winapi::PIXELFORMATDESCRIPTOR>() as u32;
let num = unsafe { gdi32::DescribePixelFormat(hdc, 1, size_of_pxfmtdescr, ptr::null_mut()) };
let mut result = Vec::new();
for index in (0 .. num) {
let mut output: winapi::PIXELFORMATDESCRIPTOR = unsafe { mem::zeroed() };
if unsafe { gdi32::DescribePixelFormat(hdc, index, size_of_pxfmtdescr,
&mut output) } == 0
{
continue;
}
if (output.dwFlags & winapi::PFD_DRAW_TO_WINDOW) == 0 {
continue;
}
if (output.dwFlags & winapi::PFD_SUPPORT_OPENGL) == 0 {
continue;
}
if (output.dwFlags & winapi::PFD_GENERIC_ACCELERATED) == 0 &&
(output.dwFlags & winapi::PFD_GENERIC_FORMAT) == 0
{
continue;
}
if output.iPixelType != winapi::PFD_TYPE_RGBA {
continue;
}
result.push((PixelFormat {
red_bits: output.cRedBits,
green_bits: output.cGreenBits,
blue_bits: output.cBlueBits,
alpha_bits: output.cAlphaBits,
depth_bits: output.cDepthBits,
stencil_bits: output.cStencilBits,
stereoscopy: (output.dwFlags & winapi::PFD_STEREO) != 0,
double_buffer: (output.dwFlags & winapi::PFD_DOUBLEBUFFER) != 0,
multisampling: None,
srgb: false,
}, index));
}
result
}
fn enumerate_arb_pixel_formats(extra: &gl::wgl_extra::Wgl, hdc: winapi::HDC)
-> Vec<(PixelFormat, libc::c_int)>
{
let get_info = |index: u32, attrib: u32| {
let mut value = unsafe { mem::uninitialized() };
unsafe { extra.GetPixelFormatAttribivARB(hdc as *const libc::c_void, index as libc::c_int,
0, 1, [attrib as libc::c_int].as_ptr(),
&mut value) };
value as u32
};
// getting the number of formats
// the `1` is ignored
let num = get_info(1, gl::wgl_extra::NUMBER_PIXEL_FORMATS_ARB);
let mut result = Vec::new();
for index in (0 .. num) {
if get_info(index, gl::wgl_extra::DRAW_TO_WINDOW_ARB) == 0 {
continue;
}
if get_info(index, gl::wgl_extra::SUPPORT_OPENGL_ARB) == 0 {
continue;
}
if get_info(index, gl::wgl_extra::ACCELERATION_ARB) == gl::wgl_extra::NO_ACCELERATION_ARB {
continue;
}
if get_info(index, gl::wgl_extra::PIXEL_TYPE_ARB) != gl::wgl_extra::TYPE_RGBA_ARB {
continue;
}
result.push((PixelFormat {
red_bits: get_info(index, gl::wgl_extra::RED_BITS_ARB) as u8,
green_bits: get_info(index, gl::wgl_extra::GREEN_BITS_ARB) as u8,
blue_bits: get_info(index, gl::wgl_extra::BLUE_BITS_ARB) as u8,
alpha_bits: get_info(index, gl::wgl_extra::ALPHA_BITS_ARB) as u8,
depth_bits: get_info(index, gl::wgl_extra::DEPTH_BITS_ARB) as u8,
stencil_bits: get_info(index, gl::wgl_extra::STENCIL_BITS_ARB) as u8,
stereoscopy: get_info(index, gl::wgl_extra::STEREO_ARB) != 0,
double_buffer: get_info(index, gl::wgl_extra::DOUBLE_BUFFER_ARB) != 0,
multisampling: None, // FIXME:
srgb: false, // FIXME:
}, index as libc::c_int));
}
result
}
fn load_opengl32_dll() -> Result<winapi::HMODULE, CreationError> {
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() {
return Err(OsError(format!("LoadLibrary function failed: {}",
os::error_string(os::errno() as usize))));
}
Ok(lib)
}