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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#![cfg(windows)]
extern crate gleam;
extern crate mozangle;
extern crate winapi;
use com::{ComPtr, CheckHResult, as_ptr};
use std::ptr;
use std::rc::Rc;
use winapi::shared::dxgi1_2::DXGI_SWAP_CHAIN_DESC1;
use winapi::shared::dxgi1_2::IDXGIFactory2;
use winapi::shared::minwindef::{TRUE, FALSE};
use winapi::shared::windef::HWND;
use winapi::um::d3d11::ID3D11Device;
use winapi::um::dcomp::IDCompositionDevice;
use winapi::um::dcomp::IDCompositionTarget;
use winapi::um::dcomp::IDCompositionVisual;
mod com;
mod egl;
pub struct DirectComposition {
d3d_device: ComPtr<ID3D11Device>,
dxgi_factory: ComPtr<IDXGIFactory2>,
egl: Rc<egl::SharedEglThings>,
pub gleam: Rc<dyn gleam::gl::Gl>,
composition_device: ComPtr<IDCompositionDevice>,
root_visual: ComPtr<IDCompositionVisual>,
#[allow(unused)] // Needs to be kept alive
composition_target: ComPtr<IDCompositionTarget>,
}
impl DirectComposition {
/// Initialize DirectComposition in the given window
///
/// # Safety
///
/// `hwnd` must be a valid handle to a window.
pub unsafe fn new(hwnd: HWND) -> Self {
let d3d_device = ComPtr::new_with(|ptr_ptr| winapi::um::d3d11::D3D11CreateDevice(
ptr::null_mut(),
winapi::um::d3dcommon::D3D_DRIVER_TYPE_HARDWARE,
ptr::null_mut(),
winapi::um::d3d11::D3D11_CREATE_DEVICE_BGRA_SUPPORT |
if cfg!(debug_assertions) {
winapi::um::d3d11::D3D11_CREATE_DEVICE_DEBUG
} else {
0
},
ptr::null_mut(),
0,
winapi::um::d3d11::D3D11_SDK_VERSION,
ptr_ptr,
&mut 0,
ptr::null_mut(),
));
let egl = egl::SharedEglThings::new(d3d_device.as_raw());
let gleam = gleam::gl::GlesFns::load_with(egl::get_proc_address);
let dxgi_device = d3d_device.cast::<winapi::shared::dxgi::IDXGIDevice>();
// https://msdn.microsoft.com/en-us/library/windows/desktop/hh404556(v=vs.85).aspx#code-snippet-1
// “Because you can create a Direct3D device without creating a swap chain,
// you might need to retrieve the factory that is used to create the device
// in order to create a swap chain.”
let adapter = ComPtr::new_with(|ptr_ptr| dxgi_device.GetAdapter(ptr_ptr));
let dxgi_factory = ComPtr::<IDXGIFactory2>::new_with_uuid(|uuid, ptr_ptr| {
adapter.GetParent(uuid, ptr_ptr)
});
// Create the DirectComposition device object.
let composition_device = ComPtr::<IDCompositionDevice>::new_with_uuid(|uuid, ptr_ptr| {
winapi::um::dcomp::DCompositionCreateDevice(&*dxgi_device, uuid, ptr_ptr)
});
// Create the composition target object based on the
// specified application window.
let composition_target = ComPtr::new_with(|ptr_ptr| {
composition_device.CreateTargetForHwnd(hwnd, TRUE, ptr_ptr)
});
let root_visual = ComPtr::new_with(|ptr_ptr| composition_device.CreateVisual(ptr_ptr));
composition_target.SetRoot(&*root_visual).check_hresult();
DirectComposition {
d3d_device, dxgi_factory,
egl, gleam,
composition_device, composition_target, root_visual,
}
}
/// Execute changes to the DirectComposition scene.
pub fn commit(&self) {
unsafe {
self.composition_device.Commit().check_hresult()
}
}
pub fn create_angle_visual(&self, width: u32, height: u32) -> AngleVisual {
unsafe {
let desc = DXGI_SWAP_CHAIN_DESC1 {
Width: width,
Height: height,
Format: winapi::shared::dxgiformat::DXGI_FORMAT_B8G8R8A8_UNORM,
Stereo: FALSE,
SampleDesc: winapi::shared::dxgitype::DXGI_SAMPLE_DESC {
Count: 1,
Quality: 0,
},
BufferUsage: winapi::shared::dxgitype::DXGI_USAGE_RENDER_TARGET_OUTPUT,
BufferCount: 2,
Scaling: winapi::shared::dxgi1_2::DXGI_SCALING_STRETCH,
SwapEffect: winapi::shared::dxgi::DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL,
AlphaMode: winapi::shared::dxgi1_2::DXGI_ALPHA_MODE_PREMULTIPLIED,
Flags: 0,
};
let swap_chain = ComPtr::<winapi::shared::dxgi1_2::IDXGISwapChain1>::new_with(|ptr_ptr| {
self.dxgi_factory.CreateSwapChainForComposition(
as_ptr(&self.d3d_device),
&desc,
ptr::null_mut(),
ptr_ptr,
)
});
let back_buffer = ComPtr::<winapi::um::d3d11::ID3D11Texture2D>::new_with_uuid(|uuid, ptr_ptr| {
swap_chain.GetBuffer(0, uuid, ptr_ptr)
});
let egl = egl::PerVisualEglThings::new(self.egl.clone(), &*back_buffer, width, height);
let gleam = self.gleam.clone();
let visual = ComPtr::new_with(|ptr_ptr| self.composition_device.CreateVisual(ptr_ptr));
visual.SetContent(&*****swap_chain).check_hresult();
self.root_visual.AddVisual(&*visual, FALSE, ptr::null_mut()).check_hresult();
AngleVisual { visual, swap_chain, egl, gleam }
}
}
}
/// A DirectComposition "visual" configured for rendering with Direct3D.
pub struct AngleVisual {
visual: ComPtr<IDCompositionVisual>,
swap_chain: ComPtr<winapi::shared::dxgi1_2::IDXGISwapChain1>,
egl: egl::PerVisualEglThings,
pub gleam: Rc<dyn gleam::gl::Gl>,
}
impl AngleVisual {
pub fn set_offset_x(&self, offset_x: f32) {
unsafe {
self.visual.SetOffsetX_1(offset_x).check_hresult()
}
}
pub fn set_offset_y(&self, offset_y: f32) {
unsafe {
self.visual.SetOffsetY_1(offset_y).check_hresult()
}
}
pub fn make_current(&self) {
self.egl.make_current()
}
pub fn present(&self) {
self.gleam.finish();
unsafe {
self.swap_chain.Present(0, 0).check_hresult()
}
}
}
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