1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163

use crate::*;
use windows::Win32::Foundation::*;
use windows::Win32::Graphics::{Direct2D::*, Direct3D::*, Direct3D11::*, Dxgi::Common::*, Dxgi::*};

#[derive(Clone, PartialEq, Eq)]
pub struct RenderTarget {
    swap_chain: IDXGISwapChain1,
    render_target: Option<d3d11::RenderTarget>,
    interval: u32,
}

impl RenderTarget {
    #[inline]
    pub fn set_interval(&mut self, interval: u32) {
        self.interval = interval;
    }
}

impl Target for RenderTarget {
    fn bitmap(&self) -> &ID2D1Bitmap1 {
        self.render_target.as_ref().unwrap().bitmap()
    }

    fn size(&self) -> Size<f32> {
        self.render_target.as_ref().unwrap().size()
    }

    fn physical_size(&self) -> Size<u32> {
        self.render_target.as_ref().unwrap().physical_size()
    }
}

#[derive(Clone)]
pub struct Direct2D {
    d3d11_device: ID3D11Device,
    d3d11: Direct3D11,
    dxgi_factory: IDXGIFactory2,
}

impl Direct2D {
    #[inline]
    pub fn new() -> Result<Self> {
        unsafe {
            let d3d11_device: ID3D11Device = {
                let mut p = None;
                D3D11CreateDevice(
                    None,
                    D3D_DRIVER_TYPE_HARDWARE,
                    HMODULE::default(),
                    D3D11_CREATE_DEVICE_BGRA_SUPPORT,
                    Some(&[D3D_FEATURE_LEVEL_11_0]),
                    D3D11_SDK_VERSION,
                    Some(&mut p),
                    None,
                    None,
                )
                .map(|_| p.unwrap())?
            };
            let dxgi_factory: IDXGIFactory2 = CreateDXGIFactory1()?;
            let d3d11 = Direct3D11::new(&d3d11_device)?;
            Ok(Self {
                d3d11_device,
                dxgi_factory,
                d3d11,
            })
        }
    }
}

impl Context<Direct2D> {
    pub fn create_render_target(
        &self,
        hwnd: impl WindowHandle,
        size: impl Into<Size<u32>>,
    ) -> Result<RenderTarget> {
        let size = size.into();
        unsafe {
            let swap_chain = self.backend.dxgi_factory.CreateSwapChainForHwnd(
                &self.backend.d3d11_device,
                hwnd.handle(),
                &DXGI_SWAP_CHAIN_DESC1 {
                    Width: size.width,
                    Height: size.height,
                    Format: DXGI_FORMAT_B8G8R8A8_UNORM,
                    BufferCount: 2,
                    BufferUsage: DXGI_USAGE_RENDER_TARGET_OUTPUT,
                    SwapEffect: DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL,
                    Scaling: DXGI_SCALING_NONE,
                    SampleDesc: DXGI_SAMPLE_DESC {
                        Count: 1,
                        Quality: 0,
                    },
                    ..Default::default()
                },
                None,
                None,
            )?;
            let render_target = self
                .backend
                .d3d11
                .create_render_target_from_swap_chain(&self.d2d1_device_context, &swap_chain)?;
            Ok(RenderTarget {
                swap_chain,
                render_target: Some(render_target),
                interval: 1,
            })
        }
    }

    pub fn resize_target(
        &self,
        target: &mut RenderTarget,
        size: impl Into<Size<u32>>,
    ) -> Result<()> {
        let size = size.into();
        target.render_target = None;
        unsafe {
            target
                .swap_chain
                .ResizeBuffers(0, size.width, size.height, DXGI_FORMAT_UNKNOWN, 0)?;
        }
        target.render_target =
            Some(self.backend.d3d11.create_render_target_from_swap_chain(
                &self.d2d1_device_context,
                &target.swap_chain,
            )?);
        Ok(())
    }
}

impl Backend for Direct2D {
    type RenderTarget = RenderTarget;

    fn d2d1_device(&self) -> &ID2D1Device5 {
        self.d3d11.d2d1_device()
    }

    fn d2d1_factory(&self) -> &ID2D1Factory6 {
        self.d3d11.d2d1_factory()
    }

    fn begin_draw(&self, target: &Self::RenderTarget) {
        self.d3d11
            .begin_draw(target.render_target.as_ref().unwrap())
    }

    fn end_draw(&self, target: &Self::RenderTarget, ret: Result<()>) -> Result<()> {
        let ret = self
            .d3d11
            .end_draw(target.render_target.as_ref().unwrap(), ret);
        match ret {
            Ok(_) => unsafe {
                let params = DXGI_PRESENT_PARAMETERS::default();
                target
                    .swap_chain
                    .Present1(target.interval, 0, &params)
                    .ok()?;
                Ok(())
            },
            Err(e) => Err(e),
        }
    }
}