mirror of
https://github.com/italicsjenga/winit-sonoma-fix.git
synced 2024-12-25 06:41:31 +11:00
Several WGL cleanups
This commit is contained in:
Pierre Krieger
parent
e5f888e19a
commit
ead31e3ef8
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@ -24,6 +24,9 @@ use gdi32;
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mod make_current_guard;
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mod gl;
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/// A WGL context.
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///
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/// Note: should be destroyed before its window.
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pub struct Context {
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context: ContextWrapper,
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@ -50,6 +53,7 @@ impl Drop for WindowWrapper {
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}
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}
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/// Wraps around a context so that it is destroyed when necessary.
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struct ContextWrapper(winapi::HGLRC);
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impl Drop for ContextWrapper {
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@ -64,127 +68,85 @@ impl Context {
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/// Attempt to build a new WGL context on a window.
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///
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/// The window must **not** have had `SetPixelFormat` called on it.
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pub fn new(builder: &BuilderAttribs<'static>, window: winapi::HWND,
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builder_sharelists: Option<winapi::HGLRC>)
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-> Result<Context, CreationError>
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///
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/// # Unsafety
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///
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/// The `window` must continue to exist as long as the resulting `Context` exists.
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pub unsafe fn new(builder: &BuilderAttribs<'static>, window: winapi::HWND,
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builder_sharelists: Option<winapi::HGLRC>)
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-> Result<Context, CreationError>
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{
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unsafe {
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let hdc = user32::GetDC(window);
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if hdc.is_null() {
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let err = Err(CreationError::OsError(format!("GetDC function failed: {}",
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format!("{}", io::Error::last_os_error()))));
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return err;
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}
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// the first step is to create a dummy window and a dummy context which we will use
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// to load the pointers to some functions in the OpenGL driver in `extra_functions`
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let extra_functions = {
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let (ex_style, style) = (winapi::WS_EX_APPWINDOW, winapi::WS_POPUP |
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winapi::WS_CLIPSIBLINGS | winapi::WS_CLIPCHILDREN);
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// creating a dummy invisible window
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let dummy_window = {
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let rect = {
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let mut placement: winapi::WINDOWPLACEMENT = unsafe { mem::zeroed() };
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placement.length = mem::size_of::<winapi::WINDOWPLACEMENT>() as winapi::UINT;
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if unsafe { user32::GetWindowPlacement(window, &mut placement) } == 0 {
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panic!();
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}
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placement.rcNormalPosition
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};
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let mut class_name = [0u16; 128];
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if user32::GetClassNameW(window, class_name.as_mut_ptr(), 128) == 0 {
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return Err(CreationError::OsError(format!("GetClassNameW function failed: {}",
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format!("{}", io::Error::last_os_error()))));
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}
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let handle = user32::CreateWindowExW(ex_style, class_name.as_ptr(),
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b"dummy window\0".as_ptr() as *const _, style,
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winapi::CW_USEDEFAULT, winapi::CW_USEDEFAULT,
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rect.right - rect.left, rect.bottom - rect.top,
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ptr::null_mut(), ptr::null_mut(),
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kernel32::GetModuleHandleW(ptr::null()),
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ptr::null_mut());
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if handle.is_null() {
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return Err(CreationError::OsError(format!("CreateWindowEx function failed: {}",
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format!("{}", io::Error::last_os_error()))));
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}
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let hdc = user32::GetDC(handle);
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if hdc.is_null() {
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let err = Err(CreationError::OsError(format!("GetDC function failed: {}",
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format!("{}", io::Error::last_os_error()))));
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return err;
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}
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WindowWrapper(handle, hdc)
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};
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// getting the pixel format that we will use and setting it
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{
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let formats = enumerate_native_pixel_formats(dummy_window.1);
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let id = try!(choose_dummy_pixel_format(formats.into_iter()));
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try!(set_pixel_format(dummy_window.1, id));
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}
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// creating the dummy OpenGL context and making it current
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let dummy_context = try!(create_context(None, dummy_window.0, dummy_window.1, None));
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let _current_context = try!(CurrentContextGuard::make_current(dummy_window.1,
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dummy_context.0));
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// loading the extra WGL functions
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gl::wgl_extra::Wgl::load_with(|addr| {
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let addr = CString::new(addr.as_bytes()).unwrap();
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let addr = addr.as_ptr();
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gl::wgl::GetProcAddress(addr) as *const libc::c_void
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})
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};
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// calling SetPixelFormat
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let pixel_format = {
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let formats = if extra_functions.GetPixelFormatAttribivARB.is_loaded() {
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let f = enumerate_arb_pixel_formats(&extra_functions, hdc);
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if f.is_empty() {
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enumerate_native_pixel_formats(hdc)
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} else {
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f
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}
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} else {
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enumerate_native_pixel_formats(hdc)
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};
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let (id, f) = try!(builder.choose_pixel_format(formats.into_iter().map(|(a, b)| (b, a))));
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try!(set_pixel_format(hdc, id));
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f
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};
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// creating the OpenGL context
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let context = try!(create_context(Some((&extra_functions, builder)), window, hdc,
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builder_sharelists));
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// loading the opengl32 module
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let gl_library = try!(load_opengl32_dll());
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// handling vsync
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if builder.vsync {
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if extra_functions.SwapIntervalEXT.is_loaded() {
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let _guard = try!(CurrentContextGuard::make_current(hdc, context.0));
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if extra_functions.SwapIntervalEXT(1) == 0 {
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return Err(CreationError::OsError(format!("wglSwapIntervalEXT failed")));
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}
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}
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}
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Ok(Context {
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context: context,
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hdc: hdc,
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gl_library: gl_library,
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pixel_format: pixel_format,
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})
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let hdc = user32::GetDC(window);
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if hdc.is_null() {
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let err = Err(CreationError::OsError(format!("GetDC function failed: {}",
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format!("{}", io::Error::last_os_error()))));
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return err;
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}
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// loading the functions that are not guaranteed to be supported
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let extra_functions = try!(load_extra_functions(window));
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// getting the list of the supported extensions
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let extensions = if extra_functions.GetExtensionsStringARB.is_loaded() {
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let data = extra_functions.GetExtensionsStringARB(hdc as *const _);
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let data = CStr::from_ptr(data).to_bytes().to_vec();
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String::from_utf8(data).unwrap()
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} else if extra_functions.GetExtensionsStringEXT.is_loaded() {
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let data = extra_functions.GetExtensionsStringEXT();
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let data = CStr::from_ptr(data).to_bytes().to_vec();
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String::from_utf8(data).unwrap()
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} else {
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format!("")
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};
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// calling SetPixelFormat
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let pixel_format = {
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let formats = if extensions.split(' ').find(|&i| i == "WGL_ARB_pixel_format")
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.is_some()
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{
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let f = enumerate_arb_pixel_formats(&extra_functions, &extensions, hdc);
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if f.is_empty() {
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enumerate_native_pixel_formats(hdc)
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} else {
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f
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}
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} else {
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enumerate_native_pixel_formats(hdc)
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};
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let (id, f) = try!(builder.choose_pixel_format(formats));
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try!(set_pixel_format(hdc, id));
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f
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};
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// creating the OpenGL context
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let context = try!(create_context(Some((&extra_functions, builder, &extensions)),
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window, hdc, builder_sharelists));
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// loading the opengl32 module
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let gl_library = try!(load_opengl32_dll());
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// handling vsync
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if builder.vsync {
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// contrary to most extensions, it is permitted to discover the presence of
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// `WGL_EXT_swap_control` by seeing if the function pointer is available
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if extra_functions.SwapIntervalEXT.is_loaded() {
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let _guard = try!(CurrentContextGuard::make_current(hdc, context.0));
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if extra_functions.SwapIntervalEXT(1) == 0 {
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return Err(CreationError::OsError(format!("wglSwapIntervalEXT failed")));
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}
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}
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}
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Ok(Context {
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context: context,
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hdc: hdc,
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gl_library: gl_library,
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pixel_format: pixel_format,
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})
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}
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/// Returns the raw HGLRC.
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@ -233,14 +195,21 @@ impl GlContext for Context {
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unsafe impl Send for Context {}
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unsafe impl Sync for Context {}
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unsafe fn create_context(extra: Option<(&gl::wgl_extra::Wgl, &BuilderAttribs<'static>)>,
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/// Creates an OpenGL context.
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///
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/// If `extra` is `Some`, this function will attempt to use the latest WGL functions to create the
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/// context.
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///
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/// Otherwise, only the basic API will be used and the chances of `CreationError::NotSupported`
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/// being returned increase.
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unsafe fn create_context(extra: Option<(&gl::wgl_extra::Wgl, &BuilderAttribs<'static>, &str)>,
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_: winapi::HWND, hdc: winapi::HDC, share: Option<winapi::HGLRC>)
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-> Result<ContextWrapper, CreationError>
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{
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let share = share.unwrap_or(ptr::null_mut());
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let ctxt = if let Some((extra_functions, builder)) = extra {
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if extra_functions.CreateContextAttribsARB.is_loaded() {
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let ctxt = if let Some((extra_functions, builder, extensions)) = extra {
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if extensions.split(' ').find(|&i| i == "WGL_ARB_create_context").is_some() {
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let mut attributes = Vec::new();
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match builder.gl_version {
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@ -252,8 +221,8 @@ unsafe fn create_context(extra: Option<(&gl::wgl_extra::Wgl, &BuilderAttribs<'st
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attributes.push(minor as libc::c_int);
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},
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GlRequest::Specific(Api::OpenGlEs, (major, minor)) => {
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if is_extension_supported(extra_functions, hdc,
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"WGL_EXT_create_context_es2_profile")
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if extensions.split(' ').find(|&i| i == "WGL_EXT_create_context_es2_profile")
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.is_some()
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{
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attributes.push(gl::wgl_extra::CONTEXT_PROFILE_MASK_ARB as libc::c_int);
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attributes.push(gl::wgl_extra::CONTEXT_ES2_PROFILE_BIT_EXT as libc::c_int);
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@ -276,8 +245,7 @@ unsafe fn create_context(extra: Option<(&gl::wgl_extra::Wgl, &BuilderAttribs<'st
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}
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if let Some(profile) = builder.gl_profile {
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if is_extension_supported(extra_functions, hdc,
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"WGL_ARB_create_context_profile")
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if extensions.split(' ').find(|&i| i == "WGL_ARB_create_context_profile").is_some()
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{
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let flag = match profile {
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GlProfile::Compatibility =>
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@ -329,7 +297,10 @@ unsafe fn create_context(extra: Option<(&gl::wgl_extra::Wgl, &BuilderAttribs<'st
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Ok(ContextWrapper(ctxt as winapi::HGLRC))
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}
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unsafe fn enumerate_native_pixel_formats(hdc: winapi::HDC) -> Vec<(PixelFormat, libc::c_int)> {
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/// Enumerates the list of pixel formats without using WGL.
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///
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/// Gives less precise results than `enumerate_arb_pixel_formats`.
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unsafe fn enumerate_native_pixel_formats(hdc: winapi::HDC) -> Vec<(libc::c_int, PixelFormat)> {
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let size_of_pxfmtdescr = mem::size_of::<winapi::PIXELFORMATDESCRIPTOR>() as u32;
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let num = gdi32::DescribePixelFormat(hdc, 1, size_of_pxfmtdescr, ptr::null_mut());
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@ -354,7 +325,7 @@ unsafe fn enumerate_native_pixel_formats(hdc: winapi::HDC) -> Vec<(PixelFormat,
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continue;
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}
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result.push((PixelFormat {
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result.push((index, PixelFormat {
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hardware_accelerated: (output.dwFlags & winapi::PFD_GENERIC_FORMAT) == 0,
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color_bits: output.cRedBits + output.cGreenBits + output.cBlueBits,
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alpha_bits: output.cAlphaBits,
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@ -364,14 +335,17 @@ unsafe fn enumerate_native_pixel_formats(hdc: winapi::HDC) -> Vec<(PixelFormat,
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double_buffer: (output.dwFlags & winapi::PFD_DOUBLEBUFFER) != 0,
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multisampling: None,
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srgb: false,
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}, index));
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}));
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}
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result
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}
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unsafe fn enumerate_arb_pixel_formats(extra: &gl::wgl_extra::Wgl, hdc: winapi::HDC)
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-> Vec<(PixelFormat, libc::c_int)>
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/// Enumerates the list of pixel formats by using extra WGL functions.
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///
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/// Gives more precise results than `enumerate_native_pixel_formats`.
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unsafe fn enumerate_arb_pixel_formats(extra: &gl::wgl_extra::Wgl, extensions: &str,
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hdc: winapi::HDC) -> Vec<(libc::c_int, PixelFormat)>
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{
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let get_info = |index: u32, attrib: u32| {
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let mut value = mem::uninitialized();
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@ -403,7 +377,7 @@ unsafe fn enumerate_arb_pixel_formats(extra: &gl::wgl_extra::Wgl, hdc: winapi::H
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continue;
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}
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result.push((PixelFormat {
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result.push((index as libc::c_int, PixelFormat {
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hardware_accelerated: true,
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color_bits: get_info(index, gl::wgl_extra::RED_BITS_ARB) as u8 +
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get_info(index, gl::wgl_extra::GREEN_BITS_ARB) as u8 +
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@ -414,7 +388,7 @@ unsafe fn enumerate_arb_pixel_formats(extra: &gl::wgl_extra::Wgl, hdc: winapi::H
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stereoscopy: get_info(index, gl::wgl_extra::STEREO_ARB) != 0,
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double_buffer: get_info(index, gl::wgl_extra::DOUBLE_BUFFER_ARB) != 0,
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multisampling: {
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if is_extension_supported(extra, hdc, "WGL_ARB_multisample") {
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if extensions.split(' ').find(|&i| i == "WGL_ARB_multisample").is_some() {
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match get_info(index, gl::wgl_extra::SAMPLES_ARB) {
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0 => None,
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a => Some(a as u16),
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@ -423,19 +397,20 @@ unsafe fn enumerate_arb_pixel_formats(extra: &gl::wgl_extra::Wgl, hdc: winapi::H
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None
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}
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},
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srgb: if is_extension_supported(extra, hdc, "WGL_ARB_framebuffer_sRGB") {
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srgb: if extensions.split(' ').find(|&i| i == "WGL_ARB_framebuffer_sRGB").is_some() {
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get_info(index, gl::wgl_extra::FRAMEBUFFER_SRGB_CAPABLE_ARB) != 0
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} else if is_extension_supported(extra, hdc, "WGL_EXT_framebuffer_sRGB") {
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} else if extensions.split(' ').find(|&i| i == "WGL_EXT_framebuffer_sRGB").is_some() {
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get_info(index, gl::wgl_extra::FRAMEBUFFER_SRGB_CAPABLE_EXT) != 0
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} else {
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false
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},
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}, index as libc::c_int));
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}));
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}
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result
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}
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/// Calls `SetPixelFormat` on a window.
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unsafe fn set_pixel_format(hdc: winapi::HDC, id: libc::c_int) -> Result<(), CreationError> {
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let mut output: winapi::PIXELFORMATDESCRIPTOR = mem::zeroed();
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@ -454,6 +429,7 @@ unsafe fn set_pixel_format(hdc: winapi::HDC, id: libc::c_int) -> Result<(), Crea
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Ok(())
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}
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/// Loads the `opengl32.dll` library.
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unsafe fn load_opengl32_dll() -> Result<winapi::HMODULE, CreationError> {
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let name = OsStr::new("opengl32.dll").encode_wide().chain(Some(0).into_iter())
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.collect::<Vec<_>>();
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@ -468,32 +444,86 @@ unsafe fn load_opengl32_dll() -> Result<winapi::HMODULE, CreationError> {
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Ok(lib)
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}
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unsafe fn is_extension_supported(extra: &gl::wgl_extra::Wgl, hdc: winapi::HDC,
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extension: &str) -> bool
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{
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let extensions = if extra.GetExtensionsStringARB.is_loaded() {
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let data = extra.GetExtensionsStringARB(hdc as *const _);
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let data = CStr::from_ptr(data).to_bytes().to_vec();
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String::from_utf8(data).unwrap()
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/// Loads the WGL functions that are not guaranteed to be supported.
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///
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/// The `window` must be passed because the driver can vary depending on the window's
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/// characteristics.
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unsafe fn load_extra_functions(window: winapi::HWND) -> Result<gl::wgl_extra::Wgl, CreationError> {
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let (ex_style, style) = (winapi::WS_EX_APPWINDOW, winapi::WS_POPUP |
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winapi::WS_CLIPSIBLINGS | winapi::WS_CLIPCHILDREN);
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} else if extra.GetExtensionsStringEXT.is_loaded() {
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let data = extra.GetExtensionsStringEXT();
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let data = CStr::from_ptr(data).to_bytes().to_vec();
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String::from_utf8(data).unwrap()
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// creating a dummy invisible window
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let dummy_window = {
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// getting the rect of the real window
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let rect = {
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let mut placement: winapi::WINDOWPLACEMENT = mem::zeroed();
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placement.length = mem::size_of::<winapi::WINDOWPLACEMENT>() as winapi::UINT;
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if user32::GetWindowPlacement(window, &mut placement) == 0 {
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panic!();
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}
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placement.rcNormalPosition
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};
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} else {
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return false;
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// getting the class name of the real window
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let mut class_name = [0u16; 128];
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if user32::GetClassNameW(window, class_name.as_mut_ptr(), 128) == 0 {
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return Err(CreationError::OsError(format!("GetClassNameW function failed: {}",
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format!("{}", io::Error::last_os_error()))));
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}
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// this dummy window should match the real one enough to get the same OpenGL driver
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let win = user32::CreateWindowExW(ex_style, class_name.as_ptr(),
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||||
b"dummy window\0".as_ptr() as *const _, style,
|
||||
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 win.is_null() {
|
||||
return Err(CreationError::OsError(format!("CreateWindowEx function failed: {}",
|
||||
format!("{}", io::Error::last_os_error()))));
|
||||
}
|
||||
|
||||
let hdc = user32::GetDC(win);
|
||||
if hdc.is_null() {
|
||||
let err = Err(CreationError::OsError(format!("GetDC function failed: {}",
|
||||
format!("{}", io::Error::last_os_error()))));
|
||||
return err;
|
||||
}
|
||||
|
||||
WindowWrapper(win, hdc)
|
||||
};
|
||||
|
||||
extensions.split(" ").find(|&e| e == extension).is_some()
|
||||
// getting the pixel format that we will use and setting it
|
||||
{
|
||||
let formats = enumerate_native_pixel_formats(dummy_window.1);
|
||||
let id = try!(choose_dummy_pixel_format(formats.into_iter()));
|
||||
try!(set_pixel_format(dummy_window.1, id));
|
||||
}
|
||||
|
||||
// creating the dummy OpenGL context and making it current
|
||||
let dummy_context = try!(create_context(None, dummy_window.0, dummy_window.1, None));
|
||||
let _current_context = try!(CurrentContextGuard::make_current(dummy_window.1,
|
||||
dummy_context.0));
|
||||
|
||||
// loading the extra WGL functions
|
||||
Ok(gl::wgl_extra::Wgl::load_with(|addr| {
|
||||
let addr = CString::new(addr.as_bytes()).unwrap();
|
||||
let addr = addr.as_ptr();
|
||||
gl::wgl::GetProcAddress(addr) as *const libc::c_void
|
||||
}))
|
||||
}
|
||||
|
||||
/// Given a list of pixel formats, this function chooses one that is likely to be provided by
|
||||
/// the main video driver of the system.
|
||||
fn choose_dummy_pixel_format<I>(iter: I) -> Result<libc::c_int, CreationError>
|
||||
where I: Iterator<Item=(PixelFormat, libc::c_int)>
|
||||
where I: Iterator<Item=(libc::c_int, PixelFormat)>
|
||||
{
|
||||
let mut backup_id = None;
|
||||
|
||||
for (format, id) in iter {
|
||||
for (id, format) in iter {
|
||||
if backup_id.is_none() {
|
||||
backup_id = Some(id);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -352,7 +352,7 @@ impl<'a> BuilderAttribs<'a> {
|
|||
}
|
||||
|
||||
fn choose_pixel_format<T, I>(&self, iter: I) -> Result<(T, PixelFormat), CreationError>
|
||||
where I: Iterator<Item=(T, PixelFormat)>, T: Clone
|
||||
where I: IntoIterator<Item=(T, PixelFormat)>, T: Clone
|
||||
{
|
||||
let mut current_result = None;
|
||||
let mut current_software_result = None;
|
||||
|
|
|
|||
Loading…
Reference in a new issue