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Use the WGL API to determine extended pixel format, plus fix creation

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This commit is contained in:
Pierre Krieger 2015-03-01 10:33:25 +01:00
parent 77d8a11338
commit cf252c29b4
2 changed files with 34 additions and 35 deletions
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1
src/lib.rs
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@ -195,6 +195,7 @@ pub enum MouseCursor {
/// Describes a possible format. Unused.
#[allow(missing_docs)]
#[derive(Debug)]
pub struct PixelFormat {
pub red_bits: u8,
pub green_bits: u8,

68
src/win32/init.rs
View file

@ -99,9 +99,8 @@ fn init(title: Vec<u16>, builder: BuilderAttribs<'static>, builder_sharelists: O
// 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) = {
// getting the address of wglCreateContextAttribsARB
let extra_functions = {
// creating a dummy invisible window for GL initialization
let dummy_window = unsafe {
let handle = user32::CreateWindowExW(ex_style, class_name.as_ptr(),
@ -132,32 +131,11 @@ fn init(title: Vec<u16>, builder: BuilderAttribs<'static>, builder_sharelists: O
hdc
};
// getting the pixel format that we will use
let pixel_format = {
// getting the pixel format that we will use and setting it
{
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()))));
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()))));
user32::DestroyWindow(dummy_window);
return err;
}
try!(set_pixel_format(dummy_hdc, id));
}
// creating the dummy OpenGL context
@ -186,7 +164,7 @@ fn init(title: Vec<u16>, builder: BuilderAttribs<'static>, builder_sharelists: O
unsafe { user32::DestroyWindow(dummy_window); }
// returning the address
(extra_functions, pixel_format)
extra_functions
};
// creating the real window this time
@ -233,13 +211,15 @@ fn init(title: Vec<u16>, builder: BuilderAttribs<'static>, builder_sharelists: O
};
// calling SetPixelFormat
unsafe {
if gdi32::SetPixelFormat(hdc, 1, &pixel_format) == 0 {
let err = Err(OsError(format!("SetPixelFormat function failed: {}",
os::error_string(os::errno()))));
user32::DestroyWindow(real_window);
return err;
}
{
let formats = if extra_functions.GetPixelFormatAttribivARB.is_loaded() {
enumerate_arb_pixel_formats(&extra_functions, hdc)
} else {
enumerate_native_pixel_formats(hdc)
};
let (id, _) = builder.choose_pixel_format(formats.into_iter().map(|(a, b)| (b, a)));
try!(set_pixel_format(hdc, id));
}
// creating the OpenGL context
@ -512,6 +492,24 @@ fn enumerate_arb_pixel_formats(extra: &gl::wgl_extra::Wgl, hdc: winapi::HDC)
result
}
fn set_pixel_format(hdc: winapi::HDC, id: libc::c_int) -> Result<(), CreationError> {
let mut output: winapi::PIXELFORMATDESCRIPTOR = unsafe { mem::zeroed() };
if unsafe { gdi32::DescribePixelFormat(hdc, id,
mem::size_of::<winapi::PIXELFORMATDESCRIPTOR>() as winapi::UINT, &mut output) } == 0
{
return Err(OsError(format!("DescribePixelFormat function failed: {}",
os::error_string(os::errno()))));
}
if unsafe { gdi32::SetPixelFormat(hdc, id, &output) } == 0 {
return Err(OsError(format!("SetPixelFormat function failed: {}",
os::error_string(os::errno()))));
}
Ok(())
}
fn load_opengl32_dll() -> Result<winapi::HMODULE, CreationError> {
let name = "opengl32.dll".utf16_units().chain(Some(0).into_iter())
.collect::<Vec<u16>>().as_ptr();