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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
use std::error::Error;
use wgpu::CompositeAlphaMode;
use wgpu_glyph::{GlyphBrushBuilder, Section, Text, ab_glyph};
fn main() -> Result<(), Box<dyn Error>> {
env_logger::init();
// Open window and create a surface
let event_loop = winit::event_loop::EventLoop::new()?;
let window = winit::window::WindowBuilder::new()
.with_resizable(false)
.build(&event_loop)
.unwrap();
let instance = wgpu::Instance::new(&wgpu::InstanceDescriptor::default());
let surface = instance.create_surface(&window)?;
// Initialize GPU
let (device, queue) = futures::executor::block_on(async {
let adapter = instance
.request_adapter(&wgpu::RequestAdapterOptions {
power_preference: wgpu::PowerPreference::HighPerformance,
compatible_surface: Some(&surface),
force_fallback_adapter: false,
})
.await
.expect("Request adapter");
adapter
.request_device(&wgpu::DeviceDescriptor::default())
.await
.expect("Request device")
});
// Create staging belt
let mut staging_belt = wgpu::util::StagingBelt::new(device.clone(), 1024);
// Prepare swap chain
let render_format = wgpu::TextureFormat::Bgra8UnormSrgb;
let mut size = window.inner_size();
surface.configure(
&device,
&wgpu::SurfaceConfiguration {
usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
format: render_format,
width: size.width,
height: size.height,
present_mode: wgpu::PresentMode::AutoVsync,
alpha_mode: CompositeAlphaMode::Auto,
view_formats: vec![],
desired_maximum_frame_latency: 2,
},
);
// Prepare glyph_brush
let inconsolata = ab_glyph::FontArc::try_from_slice(include_bytes!(
"Inconsolata-Regular.ttf"
))?;
let mut glyph_brush = GlyphBrushBuilder::using_font(inconsolata)
.build(&device, render_format);
// Render loop
window.request_redraw();
event_loop
.run(move |event, elwt| {
match event {
winit::event::Event::WindowEvent {
event: winit::event::WindowEvent::CloseRequested,
..
} => elwt.exit(),
winit::event::Event::WindowEvent {
event: winit::event::WindowEvent::Resized(new_size),
..
} => {
size = new_size;
surface.configure(
&device,
&wgpu::SurfaceConfiguration {
usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
format: render_format,
width: size.width,
height: size.height,
present_mode: wgpu::PresentMode::AutoVsync,
alpha_mode: CompositeAlphaMode::Auto,
view_formats: vec![render_format],
desired_maximum_frame_latency: 2,
},
);
}
winit::event::Event::WindowEvent {
event: winit::event::WindowEvent::RedrawRequested,
..
} => {
// Get a command encoder for the current frame
let mut encoder = device.create_command_encoder(
&wgpu::CommandEncoderDescriptor {
label: Some("Redraw"),
},
);
// Get the next frame
let frame =
surface.get_current_texture().expect("Get next frame");
let view = &frame
.texture
.create_view(&wgpu::TextureViewDescriptor::default());
// Clear frame
{
let _ = encoder.begin_render_pass(
&wgpu::RenderPassDescriptor {
label: Some("Render pass"),
color_attachments: &[Some(
wgpu::RenderPassColorAttachment {
view,
resolve_target: None,
ops: wgpu::Operations {
load: wgpu::LoadOp::Clear(
wgpu::Color {
r: 0.4,
g: 0.4,
b: 0.4,
a: 1.0,
},
),
store: wgpu::StoreOp::Store,
},
depth_slice: None,
},
)],
depth_stencil_attachment: None,
timestamp_writes: None,
occlusion_query_set: None,
multiview_mask: None,
},
);
}
glyph_brush.queue(Section {
screen_position: (30.0, 30.0),
bounds: (size.width as f32, size.height as f32),
text: vec![
Text::new("Hello wgpu_glyph!")
.with_color([0.0, 0.0, 0.0, 1.0])
.with_scale(40.0),
],
..Section::default()
});
glyph_brush.queue(Section {
screen_position: (30.0, 90.0),
bounds: (size.width as f32, size.height as f32),
text: vec![
Text::new("Hello wgpu_glyph!")
.with_color([1.0, 1.0, 1.0, 1.0])
.with_scale(40.0),
],
..Section::default()
});
// Draw the text!
glyph_brush
.draw_queued(
&device,
&mut staging_belt,
&mut encoder,
view,
size.width,
size.height,
)
.expect("Draw queued");
// Submit the work!
staging_belt.finish();
queue.submit(Some(encoder.finish()));
frame.present();
// Recall unused staging buffers
staging_belt.recall();
}
_ => {}
}
})
.map_err(Into::into)
}