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Add OpenGL context on Windows

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This commit is contained in:
Mirko Covizzi 2020-05-29 21:03:22 +02:00
parent da758e3da4
commit e2c4c53f32
2 changed files with 53 additions and 5 deletions
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3
Cargo.toml
View file

@ -15,7 +15,8 @@ edition = "2018"
xcb = { version = "0.9", features = ["thread", "xlib_xcb", "dri2"] }
[target.'cfg(target_os="windows")'.dependencies]
winapi = { version = "0.3.8", features = ["libloaderapi", "winuser", "windef", "minwindef", "guiddef", "combaseapi"] }
winapi = { version = "0.3.8", features = ["libloaderapi", "winuser", "windef", "minwindef", "guiddef", "combaseapi", "wingdi"] }
gl = "0.14.0"
[target.'cfg(target_os="macos")'.dependencies]
cocoa = "0.20.1"

55
src/win/window.rs
View file

@ -5,20 +5,23 @@ use std::ptr::null_mut;
use self::winapi::_core::mem::MaybeUninit;
use self::winapi::shared::guiddef::GUID;
use self::winapi::shared::minwindef::{LPARAM, LPVOID, LRESULT, UINT, WPARAM};
use self::winapi::shared::windef::{HBRUSH, HICON, HMENU, HWND};
use self::winapi::shared::windef::{HBRUSH, HICON, HMENU, HWND, HGLRC};
use self::winapi::um::combaseapi::CoCreateGuid;
use self::winapi::um::libloaderapi::GetModuleHandleA;
use self::winapi::um::libloaderapi::{GetModuleHandleA, LoadLibraryA, GetProcAddress};
use self::winapi::um::wingdi::{wglCreateContext, wglMakeCurrent, ChoosePixelFormat, SetPixelFormat, PFD_DOUBLEBUFFER, PFD_DRAW_TO_WINDOW, PFD_SUPPORT_OPENGL, PFD_TYPE_RGBA, PIXELFORMATDESCRIPTOR, SwapBuffers, PFD_MAIN_PLANE};
use self::winapi::um::winuser::{
CreateWindowExA, DefWindowProcA, DispatchMessageA, PeekMessageA, PostQuitMessage,
CreateWindowExA, DefWindowProcA, DispatchMessageA, GetDC, PeekMessageA, PostQuitMessage,
RegisterClassA, TranslateMessage, CS_HREDRAW, CS_OWNDC, CS_VREDRAW, CW_USEDEFAULT, MSG,
PM_REMOVE, WM_DESTROY, WM_QUIT, WNDCLASSA, WS_OVERLAPPEDWINDOW, WS_VISIBLE,
};
use crate::WindowOpenOptions;
use std::ffi::CString;
pub struct Window;
impl Window {
// todo: we should decide this interface
pub fn open(options: WindowOpenOptions) -> Self {
unsafe {
// We generate a unique name for the new window class to prevent name collisions
@ -55,7 +58,7 @@ impl Window {
};
RegisterClassA(&wnd_class);
let _hwnd = CreateWindowExA(
let hwnd = CreateWindowExA(
0,
class_name.as_ptr() as *const i8,
(options.title.to_owned() + "\0").as_ptr() as *const i8,
@ -72,10 +75,54 @@ impl Window {
0 as LPVOID,
);
let hdc = GetDC(hwnd);
let mut pfd: PIXELFORMATDESCRIPTOR = MaybeUninit::uninit().assume_init();
pfd.nSize = core::mem::size_of::<PIXELFORMATDESCRIPTOR>() as u16;
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 32;
// todo: ask wrl why 24 instead of 32?
pfd.cDepthBits = 24;
pfd.cStencilBits = 8;
pfd.iLayerType = PFD_MAIN_PLANE;
let pf_id: i32 = ChoosePixelFormat(hdc, &pfd);
if pf_id == 0 {
return Window;
}
if SetPixelFormat(hdc, pf_id, &pfd) == 0 {
return Window;
}
let gl_context: HGLRC = wglCreateContext(hdc);
if gl_context == 0 as HGLRC {
return Window;
}
if wglMakeCurrent(hdc, gl_context) == 0 {
return Window;
}
let h = LoadLibraryA("opengl32.dll\0".as_ptr() as *const i8);
gl::load_with(|symbol| {
let symbol = CString::new(symbol.as_bytes()).unwrap();
let symbol = symbol.as_ptr();
GetProcAddress(h, symbol) as *const _
});
// todo: decide what to do with the message pump
loop {
if !handle_msg(null_mut()) {
break;
}
// todo: pass callback rendering function instead
gl::ClearColor(0.3, 0.8, 0.3, 1.0);
gl::Clear(gl::COLOR_BUFFER_BIT);
SwapBuffers(hdc);
}
}