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Detach wgl and win32

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This commit is contained in:
Pierre Krieger 2015-05-20 22:38:06 +02:00
parent b72ac990e6
commit ea17038ac2
7 changed files with 531 additions and 427 deletions
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382
src/api/win32/init.rs
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@ -8,37 +8,32 @@ use std::thread;
use super::callback;
use super::Window;
use super::MonitorID;
use super::ContextWrapper;
use super::WindowWrapper;
use super::make_current_guard::CurrentContextGuard;
use Api;
use BuilderAttribs;
use CreationError;
use CreationError::OsError;
use CursorState;
use GlProfile;
use GlRequest;
use PixelFormat;
use std::ffi::{CStr, CString, OsStr};
use std::ffi::OsStr;
use std::os::windows::ffi::OsStrExt;
use std::sync::mpsc::channel;
use libc;
use super::gl;
use winapi;
use kernel32;
use user32;
use gdi32;
use api::wgl::{self, Context};
/// Work-around the fact that HGLRC doesn't implement Send
pub struct ContextHack(pub winapi::HGLRC);
struct ContextHack(winapi::HGLRC);
unsafe impl Send for ContextHack {}
pub fn new_window(builder: BuilderAttribs<'static>, builder_sharelists: Option<ContextHack>)
pub fn new_window(builder: BuilderAttribs<'static>, builder_sharelists: Option<winapi::HGLRC>)
-> Result<Window, CreationError>
{
let builder_sharelists = builder_sharelists.map(|s| ContextHack(s));
// initializing variables to be sent to the task
let title = OsStr::new(&builder.title).encode_wide().chain(Some(0).into_iter())
@ -110,57 +105,6 @@ unsafe fn init(title: Vec<u16>, builder: BuilderAttribs<'static>,
// adjusting the window coordinates using the style
user32::AdjustWindowRectEx(&mut rect, style, 0, ex_style);
// the first step is to create a dummy window and a dummy context which we will use
// to load the pointers to some functions in the OpenGL driver in `extra_functions`
let extra_functions = {
// creating a dummy invisible window
let dummy_window = {
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: {}",
format!("{}", io::Error::last_os_error()))));
}
let hdc = user32::GetDC(handle);
if hdc.is_null() {
let err = Err(OsError(format!("GetDC function failed: {}",
format!("{}", io::Error::last_os_error()))));
return err;
}
WindowWrapper(handle, hdc)
};
// getting the pixel format that we will use and setting it
{
let formats = enumerate_native_pixel_formats(&dummy_window);
let id = try!(choose_dummy_pixel_format(formats.into_iter()));
try!(set_pixel_format(&dummy_window, id));
}
// creating the dummy OpenGL context and making it current
let dummy_context = try!(create_context(None, &dummy_window, None));
let current_context = try!(CurrentContextGuard::make_current(&dummy_window,
&dummy_context));
// loading the extra WGL functions
gl::wgl_extra::Wgl::load_with(|addr| {
use libc;
let addr = CString::new(addr.as_bytes()).unwrap();
let addr = addr.as_ptr();
gl::wgl::GetProcAddress(addr) as *const libc::c_void
})
};
// creating the real window this time, by using the functions in `extra_functions`
let real_window = {
let (width, height) = if builder.monitor.is_some() || builder.dimensions.is_some() {
@ -203,27 +147,8 @@ unsafe fn init(title: Vec<u16>, builder: BuilderAttribs<'static>,
WindowWrapper(handle, hdc)
};
// calling SetPixelFormat
let pixel_format = {
let formats = if extra_functions.GetPixelFormatAttribivARB.is_loaded() {
let f = enumerate_arb_pixel_formats(&extra_functions, &real_window);
if f.is_empty() {
enumerate_native_pixel_formats(&real_window)
} else {
f
}
} else {
enumerate_native_pixel_formats(&real_window)
};
let (id, f) = try!(builder.choose_pixel_format(formats.into_iter().map(|(a, b)| (b, a))));
try!(set_pixel_format(&real_window, id));
f
};
// creating the OpenGL context
let context = try!(create_context(Some((&extra_functions, &builder)), &real_window,
builder_sharelists));
//
let context = try!(wgl::Context::new(&builder, real_window.0, builder_sharelists));
// calling SetForegroundWindow if fullscreen
if builder.monitor.is_some() {
@ -248,29 +173,13 @@ unsafe fn init(title: Vec<u16>, builder: BuilderAttribs<'static>,
rx
};
// loading the opengl32 module
let gl_library = try!(load_opengl32_dll());
// handling vsync
if builder.vsync {
if extra_functions.SwapIntervalEXT.is_loaded() {
let _guard = try!(CurrentContextGuard::make_current(&real_window, &context));
if extra_functions.SwapIntervalEXT(1) == 0 {
return Err(OsError(format!("wglSwapIntervalEXT failed")));
}
}
}
// building the struct
Ok(Window {
window: real_window,
context: context,
gl_library: gl_library,
events_receiver: events_receiver,
is_closed: AtomicBool::new(false),
cursor_state: cursor_state,
pixel_format: pixel_format,
})
}
@ -332,276 +241,3 @@ unsafe fn switch_to_fullscreen(rect: &mut winapi::RECT, monitor: &MonitorID)
Ok(())
}
unsafe fn create_context(extra: Option<(&gl::wgl_extra::Wgl, &BuilderAttribs<'static>)>,
hdc: &WindowWrapper, share: Option<winapi::HGLRC>)
-> Result<ContextWrapper, 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();
match builder.gl_version {
GlRequest::Latest => {},
GlRequest::Specific(Api::OpenGl, (major, minor)) => {
attributes.push(gl::wgl_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
attributes.push(major as libc::c_int);
attributes.push(gl::wgl_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
attributes.push(minor as libc::c_int);
},
GlRequest::Specific(Api::OpenGlEs, (major, minor)) => {
if is_extension_supported(extra_functions, hdc,
"WGL_EXT_create_context_es2_profile")
{
attributes.push(gl::wgl_extra::CONTEXT_PROFILE_MASK_ARB as libc::c_int);
attributes.push(gl::wgl_extra::CONTEXT_ES2_PROFILE_BIT_EXT as libc::c_int);
} else {
return Err(CreationError::NotSupported);
}
attributes.push(gl::wgl_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
attributes.push(major as libc::c_int);
attributes.push(gl::wgl_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
attributes.push(minor as libc::c_int);
},
GlRequest::Specific(_, _) => return Err(CreationError::NotSupported),
GlRequest::GlThenGles { opengl_version: (major, minor), .. } => {
attributes.push(gl::wgl_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
attributes.push(major as libc::c_int);
attributes.push(gl::wgl_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
attributes.push(minor as libc::c_int);
},
}
if let Some(profile) = builder.gl_profile {
if is_extension_supported(extra_functions, hdc,
"WGL_ARB_create_context_profile")
{
let flag = match profile {
GlProfile::Compatibility =>
gl::wgl_extra::CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
GlProfile::Core =>
gl::wgl_extra::CONTEXT_CORE_PROFILE_BIT_ARB,
};
attributes.push(gl::wgl_extra::CONTEXT_PROFILE_MASK_ARB as libc::c_int);
attributes.push(flag as libc::c_int);
} else {
return Err(CreationError::NotSupported);
}
}
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(extra_functions.CreateContextAttribsARB(hdc.1 as *const libc::c_void,
share as *const libc::c_void,
attributes.as_ptr()))
} else {
None
}
} else {
None
};
let ctxt = match ctxt {
Some(ctxt) => ctxt,
None => {
let ctxt = gl::wgl::CreateContext(hdc.1 as *const libc::c_void);
if !ctxt.is_null() && !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: {}",
format!("{}", io::Error::last_os_error()))));
}
Ok(ContextWrapper(ctxt as winapi::HGLRC))
}
unsafe fn enumerate_native_pixel_formats(hdc: &WindowWrapper) -> Vec<(PixelFormat, libc::c_int)> {
let size_of_pxfmtdescr = mem::size_of::<winapi::PIXELFORMATDESCRIPTOR>() as u32;
let num = gdi32::DescribePixelFormat(hdc.1, 1, size_of_pxfmtdescr, ptr::null_mut());
let mut result = Vec::new();
for index in (0 .. num) {
let mut output: winapi::PIXELFORMATDESCRIPTOR = mem::zeroed();
if gdi32::DescribePixelFormat(hdc.1, 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.iPixelType != winapi::PFD_TYPE_RGBA {
continue;
}
result.push((PixelFormat {
hardware_accelerated: (output.dwFlags & winapi::PFD_GENERIC_FORMAT) == 0,
color_bits: output.cRedBits + output.cGreenBits + 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
}
unsafe fn enumerate_arb_pixel_formats(extra: &gl::wgl_extra::Wgl, hdc: &WindowWrapper)
-> Vec<(PixelFormat, libc::c_int)>
{
let get_info = |index: u32, attrib: u32| {
let mut value = mem::uninitialized();
extra.GetPixelFormatAttribivARB(hdc.1 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 {
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: &WindowWrapper, id: libc::c_int) -> Result<(), CreationError> {
let mut output: winapi::PIXELFORMATDESCRIPTOR = mem::zeroed();
if gdi32::DescribePixelFormat(hdc.1, id, mem::size_of::<winapi::PIXELFORMATDESCRIPTOR>()
as winapi::UINT, &mut output) == 0
{
return Err(OsError(format!("DescribePixelFormat function failed: {}",
format!("{}", io::Error::last_os_error()))));
}
if gdi32::SetPixelFormat(hdc.1, id, &output) == 0 {
return Err(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(OsError(format!("LoadLibrary function failed: {}",
format!("{}", io::Error::last_os_error()))));
}
Ok(lib)
}
unsafe fn is_extension_supported(extra: &gl::wgl_extra::Wgl, hdc: &WindowWrapper,
extension: &str) -> bool
{
let extensions = if extra.GetExtensionsStringARB.is_loaded() {
let data = extra.GetExtensionsStringARB(hdc.1 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)
}