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

use crate::bindings::Windows::Win32::Graphics::{Direct3D11::*, Dxgi::*};
use crate::*;
use windows::{Abi, Interface};

#[derive(Clone, PartialEq, Eq)]
pub struct RenderTarget(pub(crate) ID2D1Bitmap1);

impl Target for RenderTarget {
    fn bitmap(&self) -> &ID2D1Bitmap1 {
        &self.0
    }

    fn size(&self) -> Size {
        unsafe {
            let size = self.0.GetSize();
            Size::new(size.width, size.height)
        }
    }

    fn physical_size(&self) -> gecl::Size<u32> {
        unsafe {
            let size = self.0.GetPixelSize();
            gecl::Size::new(size.width, size.height)
        }
    }
}

unsafe impl Send for RenderTarget {}
unsafe impl Sync for RenderTarget {}

#[derive(Clone)]
pub struct Direct3D11 {
    d2d1_factory: ID2D1Factory1,
    device_context: ID2D1DeviceContext,
}

impl Direct3D11 {
    pub fn new(d3d11_device: &impl Interface) -> windows::Result<Self> {
        unsafe {
            let d3d11_device: ID3D11Device = d3d11_device.cast()?;
            let d2d1_factory = {
                let mut p = std::ptr::null_mut();
                D2D1CreateFactory(
                    D2D1_FACTORY_TYPE_MULTI_THREADED,
                    &ID2D1Factory1::IID,
                    &D2D1_FACTORY_OPTIONS {
                        debugLevel: D2D1_DEBUG_LEVEL_ERROR,
                    },
                    &mut p,
                )
                .and_then(|_| ID2D1Factory1::from_abi(p))?
            };
            let dxgi_device: IDXGIDevice = d3d11_device.cast()?;
            let d2d1_device = { d2d1_factory.CreateDevice(&dxgi_device)? };
            let device_context =
                { d2d1_device.CreateDeviceContext(D2D1_DEVICE_CONTEXT_OPTIONS_NONE)? };
            Ok(Self {
                d2d1_factory,
                device_context,
            })
        }
    }
}

unsafe impl Send for Direct3D11 {}
unsafe impl Sync for Direct3D11 {}

impl Backend for Direct3D11 {
    type RenderTarget = RenderTarget;

    #[inline]
    fn device_context(&self) -> &ID2D1DeviceContext {
        &self.device_context
    }

    #[inline]
    fn d2d1_factory(&self) -> &ID2D1Factory1 {
        &self.d2d1_factory
    }

    fn back_buffers(
        &self,
        swap_chain: &IDXGISwapChain1,
    ) -> windows::Result<Vec<Self::RenderTarget>> {
        unsafe {
            let desc = { swap_chain.GetDesc1()? };
            let surface: IDXGISurface = swap_chain.GetBuffer(0)?;
            let bitmap = {
                self.device_context.CreateBitmapFromDxgiSurface(
                    &surface,
                    &D2D1_BITMAP_PROPERTIES1 {
                        pixelFormat: D2D1_PIXEL_FORMAT {
                            format: desc.Format,
                            alphaMode: D2D1_ALPHA_MODE_IGNORE,
                        },
                        bitmapOptions: D2D1_BITMAP_OPTIONS_TARGET | D2D1_BITMAP_OPTIONS_CANNOT_DRAW,
                        dpiX: 96.0,
                        dpiY: 96.0,
                        ..Default::default()
                    },
                )?
            };
            Ok(vec![RenderTarget(bitmap)])
        }
    }

    fn render_target(&self, target: &impl Interface) -> windows::Result<Self::RenderTarget> {
        let texture: ID3D11Texture2D = target.cast()?;
        let desc = unsafe {
            let mut desc = D3D11_TEXTURE2D_DESC::default();
            texture.GetDesc(&mut desc);
            desc
        };
        if cfg!(debug_assertions) {
            assert!((desc.BindFlags & D3D11_BIND_RENDER_TARGET) == D3D11_BIND_RENDER_TARGET);
        }
        let surface: IDXGISurface = texture.cast()?;
        let bitmap = unsafe {
            self.device_context.CreateBitmapFromDxgiSurface(
                &surface,
                &D2D1_BITMAP_PROPERTIES1 {
                    pixelFormat: D2D1_PIXEL_FORMAT {
                        format: desc.Format,
                        alphaMode: D2D1_ALPHA_MODE_PREMULTIPLIED,
                    },
                    bitmapOptions: D2D1_BITMAP_OPTIONS_TARGET | D2D1_BITMAP_OPTIONS_CANNOT_DRAW,
                    ..Default::default()
                },
            )?
        };
        Ok(RenderTarget(bitmap))
    }

    fn begin_draw(&self, _target: &RenderTarget) {}
    fn end_draw(&self, _target: &RenderTarget) {}
}