508 lines
19 KiB
Rust
508 lines
19 KiB
Rust
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#![cfg(any(target_os = "windows"))]
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use BuilderAttribs;
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use CreationError;
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use GlContext;
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use GlRequest;
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use GlProfile;
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use PixelFormat;
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use Api;
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use self::make_current_guard::CurrentContextGuard;
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use libc;
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use std::ffi::{CStr, CString, OsStr};
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use std::os::windows::ffi::OsStrExt;
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use std::{mem, ptr};
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use std::io;
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use winapi;
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use kernel32;
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use user32;
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use gdi32;
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mod make_current_guard;
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mod gl;
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pub struct Context {
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context: ContextWrapper,
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hdc: winapi::HDC,
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/// Binded to `opengl32.dll`.
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///
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/// `wglGetProcAddress` returns null for GL 1.1 functions because they are
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/// already defined by the system. This module contains them.
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gl_library: winapi::HMODULE,
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/// The pixel format that has been used to create this context.
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pixel_format: PixelFormat,
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}
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/// A simple wrapper that destroys the window when it is destroyed.
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struct WindowWrapper(winapi::HWND, winapi::HDC);
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impl Drop for WindowWrapper {
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fn drop(&mut self) {
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unsafe {
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user32::DestroyWindow(self.0);
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}
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}
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}
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struct ContextWrapper(winapi::HGLRC);
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impl Drop for ContextWrapper {
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fn drop(&mut self) {
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unsafe {
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gl::wgl::DeleteContext(self.0 as *const _);
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}
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}
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}
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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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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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}
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}
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/// Returns the raw HGLRC.
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pub fn get_hglrc(&self) -> winapi::HGLRC {
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self.context.0
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}
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}
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impl GlContext for Context {
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unsafe fn make_current(&self) {
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// TODO: check return value
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gl::wgl::MakeCurrent(self.hdc as *const _, self.context.0 as *const _);
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}
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fn is_current(&self) -> bool {
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unsafe { gl::wgl::GetCurrentContext() == self.context.0 as *const libc::c_void }
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}
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fn get_proc_address(&self, addr: &str) -> *const libc::c_void {
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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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unsafe {
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let p = gl::wgl::GetProcAddress(addr) as *const _;
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if !p.is_null() { return p; }
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kernel32::GetProcAddress(self.gl_library, addr) as *const _
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}
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}
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fn swap_buffers(&self) {
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unsafe {
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gdi32::SwapBuffers(self.hdc);
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}
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}
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fn get_api(&self) -> Api {
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// FIXME: can be opengl es
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Api::OpenGl
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}
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fn get_pixel_format(&self) -> PixelFormat {
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self.pixel_format.clone()
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}
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}
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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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_: 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 mut attributes = Vec::new();
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match builder.gl_version {
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GlRequest::Latest => {},
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GlRequest::Specific(Api::OpenGl, (major, minor)) => {
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attributes.push(gl::wgl_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
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attributes.push(major as libc::c_int);
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attributes.push(gl::wgl_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
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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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{
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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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} else {
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return Err(CreationError::NotSupported);
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}
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attributes.push(gl::wgl_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
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attributes.push(major as libc::c_int);
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attributes.push(gl::wgl_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
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attributes.push(minor as libc::c_int);
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},
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GlRequest::Specific(_, _) => return Err(CreationError::NotSupported),
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GlRequest::GlThenGles { opengl_version: (major, minor), .. } => {
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attributes.push(gl::wgl_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
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attributes.push(major as libc::c_int);
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attributes.push(gl::wgl_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
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attributes.push(minor as libc::c_int);
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},
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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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{
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let flag = match profile {
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GlProfile::Compatibility =>
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gl::wgl_extra::CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
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GlProfile::Core =>
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gl::wgl_extra::CONTEXT_CORE_PROFILE_BIT_ARB,
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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(flag as libc::c_int);
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} else {
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return Err(CreationError::NotSupported);
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}
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}
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if builder.gl_debug {
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attributes.push(gl::wgl_extra::CONTEXT_FLAGS_ARB as libc::c_int);
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attributes.push(gl::wgl_extra::CONTEXT_DEBUG_BIT_ARB as libc::c_int);
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}
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attributes.push(0);
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Some(extra_functions.CreateContextAttribsARB(hdc as *const libc::c_void,
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share as *const libc::c_void,
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attributes.as_ptr()))
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} else {
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None
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}
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} else {
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None
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};
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let ctxt = match ctxt {
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Some(ctxt) => ctxt,
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None => {
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let ctxt = gl::wgl::CreateContext(hdc as *const libc::c_void);
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if !ctxt.is_null() && !share.is_null() {
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gl::wgl::ShareLists(share as *const libc::c_void, ctxt);
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};
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ctxt
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}
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};
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if ctxt.is_null() {
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return Err(CreationError::OsError(format!("OpenGL context creation failed: {}",
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format!("{}", io::Error::last_os_error()))));
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}
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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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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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let mut result = Vec::new();
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for index in (0 .. num) {
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let mut output: winapi::PIXELFORMATDESCRIPTOR = mem::zeroed();
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if gdi32::DescribePixelFormat(hdc, index, size_of_pxfmtdescr, &mut output) == 0 {
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continue;
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}
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if (output.dwFlags & winapi::PFD_DRAW_TO_WINDOW) == 0 {
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continue;
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}
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if (output.dwFlags & winapi::PFD_SUPPORT_OPENGL) == 0 {
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continue;
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}
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if output.iPixelType != winapi::PFD_TYPE_RGBA {
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continue;
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}
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result.push((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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depth_bits: output.cDepthBits,
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stencil_bits: output.cStencilBits,
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stereoscopy: (output.dwFlags & winapi::PFD_STEREO) != 0,
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double_buffer: (output.dwFlags & winapi::PFD_DOUBLEBUFFER) != 0,
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multisampling: None,
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srgb: false,
|
||
|
|
}, index));
|
||
|
|
}
|
||
|
|
|
||
|
|
result
|
||
|
|
}
|
||
|
|
|
||
|
|
unsafe 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 = mem::uninitialized();
|
||
|
|
extra.GetPixelFormatAttribivARB(hdc as *const _, 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 {
|
||
|
|
hardware_accelerated: true,
|
||
|
|
color_bits: get_info(index, gl::wgl_extra::RED_BITS_ARB) as u8 +
|
||
|
|
get_info(index, gl::wgl_extra::GREEN_BITS_ARB) as u8 +
|
||
|
|
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: {
|
||
|
|
if is_extension_supported(extra, hdc, "WGL_ARB_multisample") {
|
||
|
|
match get_info(index, gl::wgl_extra::SAMPLES_ARB) {
|
||
|
|
0 => None,
|
||
|
|
a => Some(a as u16),
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
None
|
||
|
|
}
|
||
|
|
},
|
||
|
|
srgb: if is_extension_supported(extra, hdc, "WGL_ARB_framebuffer_sRGB") {
|
||
|
|
get_info(index, gl::wgl_extra::FRAMEBUFFER_SRGB_CAPABLE_ARB) != 0
|
||
|
|
} else if is_extension_supported(extra, hdc, "WGL_EXT_framebuffer_sRGB") {
|
||
|
|
get_info(index, gl::wgl_extra::FRAMEBUFFER_SRGB_CAPABLE_EXT) != 0
|
||
|
|
} else {
|
||
|
|
false
|
||
|
|
},
|
||
|
|
}, index as libc::c_int));
|
||
|
|
}
|
||
|
|
|
||
|
|
result
|
||
|
|
}
|
||
|
|
|
||
|
|
unsafe fn set_pixel_format(hdc: winapi::HDC, id: libc::c_int) -> Result<(), CreationError> {
|
||
|
|
let mut output: winapi::PIXELFORMATDESCRIPTOR = mem::zeroed();
|
||
|
|
|
||
|
|
if gdi32::DescribePixelFormat(hdc, id, mem::size_of::<winapi::PIXELFORMATDESCRIPTOR>()
|
||
|
|
as winapi::UINT, &mut output) == 0
|
||
|
|
{
|
||
|
|
return Err(CreationError::OsError(format!("DescribePixelFormat function failed: {}",
|
||
|
|
format!("{}", io::Error::last_os_error()))));
|
||
|
|
}
|
||
|
|
|
||
|
|
if gdi32::SetPixelFormat(hdc, id, &output) == 0 {
|
||
|
|
return Err(CreationError::OsError(format!("SetPixelFormat function failed: {}",
|
||
|
|
format!("{}", io::Error::last_os_error()))));
|
||
|
|
}
|
||
|
|
|
||
|
|
Ok(())
|
||
|
|
}
|
||
|
|
|
||
|
|
unsafe fn load_opengl32_dll() -> Result<winapi::HMODULE, CreationError> {
|
||
|
|
let name = OsStr::new("opengl32.dll").encode_wide().chain(Some(0).into_iter())
|
||
|
|
.collect::<Vec<_>>();
|
||
|
|
|
||
|
|
let lib = kernel32::LoadLibraryW(name.as_ptr());
|
||
|
|
|
||
|
|
if lib.is_null() {
|
||
|
|
return Err(CreationError::OsError(format!("LoadLibrary function failed: {}",
|
||
|
|
format!("{}", io::Error::last_os_error()))));
|
||
|
|
}
|
||
|
|
|
||
|
|
Ok(lib)
|
||
|
|
}
|
||
|
|
|
||
|
|
unsafe fn is_extension_supported(extra: &gl::wgl_extra::Wgl, hdc: winapi::HDC,
|
||
|
|
extension: &str) -> bool
|
||
|
|
{
|
||
|
|
let extensions = if extra.GetExtensionsStringARB.is_loaded() {
|
||
|
|
let data = extra.GetExtensionsStringARB(hdc as *const _);
|
||
|
|
let data = CStr::from_ptr(data).to_bytes().to_vec();
|
||
|
|
String::from_utf8(data).unwrap()
|
||
|
|
|
||
|
|
} else if extra.GetExtensionsStringEXT.is_loaded() {
|
||
|
|
let data = extra.GetExtensionsStringEXT();
|
||
|
|
let data = CStr::from_ptr(data).to_bytes().to_vec();
|
||
|
|
String::from_utf8(data).unwrap()
|
||
|
|
|
||
|
|
} else {
|
||
|
|
return false;
|
||
|
|
};
|
||
|
|
|
||
|
|
extensions.split(" ").find(|&e| e == extension).is_some()
|
||
|
|
}
|
||
|
|
|
||
|
|
fn choose_dummy_pixel_format<I>(iter: I) -> Result<libc::c_int, CreationError>
|
||
|
|
where I: Iterator<Item=(PixelFormat, libc::c_int)>
|
||
|
|
{
|
||
|
|
let mut backup_id = None;
|
||
|
|
|
||
|
|
for (format, id) in iter {
|
||
|
|
if backup_id.is_none() {
|
||
|
|
backup_id = Some(id);
|
||
|
|
}
|
||
|
|
|
||
|
|
if format.hardware_accelerated {
|
||
|
|
return Ok(id);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
backup_id.ok_or(CreationError::NotSupported)
|
||
|
|
}
|