mod init;
use gfx::{
format::{Depth, Srgba8},
Device,
};
use gfx_glyph::{ab_glyph::*, *};
use glutin::surface::GlSurface;
use glutin_winit::GlWindow;
use init::init_example;
use std::{env, error::Error};
use winit::{
event::{ElementState, Event, KeyboardInput, MouseScrollDelta, VirtualKeyCode, WindowEvent},
event_loop::ControlFlow,
};
const MAX_FONT_SIZE: f32 = 4000.0;
fn main() -> Result<(), Box<dyn Error>> {
init_example("performance");
if cfg!(debug_assertions) && env::var("yes_i_really_want_debug_mode").is_err() {
eprintln!(
"You should probably run an example called 'performance' in release mode, \
don't you think?\n \
If you really want to see debug performance set env var `yes_i_really_want_debug_mode`"
);
return Ok(());
}
let event_loop = winit::event_loop::EventLoop::new();
let title = "gfx_glyph rendering 30,000 glyphs - scroll to size, type to modify";
let window_builder = winit::window::WindowBuilder::new()
.with_title(title)
.with_inner_size(winit::dpi::PhysicalSize::new(1024, 576));
let old_school_gfx_glutin_ext::Init {
window,
gl_surface,
gl_context,
mut device,
mut factory,
mut color_view,
mut depth_view,
..
} = old_school_gfx_glutin_ext::window_builder(&event_loop, window_builder)
.build::<Srgba8, Depth>()?;
let dejavu = FontRef::try_from_slice(include_bytes!("../../fonts/DejaVuSans.ttf"))?;
let mut glyph_brush = GlyphBrushBuilder::using_font(dejavu)
.initial_cache_size((2048, 2048))
.draw_cache_position_tolerance(1.0)
.build(factory.clone());
let mut text: String = include_str!("loads-of-unicode.txt").into();
let mut encoder: gfx::Encoder<_, _> = factory.create_command_buffer().into();
let mut font_size: f32 = 25.0;
let mut loop_helper = spin_sleep::LoopHelper::builder().build_without_target_rate();
let mut view_size = window.inner_size();
event_loop.run(move |event, _, control_flow| {
*control_flow = ControlFlow::Poll;
match event {
Event::WindowEvent { event, .. } => match event {
WindowEvent::KeyboardInput {
input:
KeyboardInput {
virtual_keycode: Some(VirtualKeyCode::Escape),
..
},
..
}
| WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit,
WindowEvent::KeyboardInput {
input:
KeyboardInput {
state: ElementState::Pressed,
virtual_keycode: Some(VirtualKeyCode::Back),
..
},
..
} => {
text.pop();
}
WindowEvent::ReceivedCharacter(c) => {
if c != '\u{7f}' && c != '\u{8}' {
text.push(c);
}
}
WindowEvent::MouseWheel {
delta: MouseScrollDelta::LineDelta(_, y),
..
} => {
if y > 0.0 {
font_size += (font_size / 4.0).max(2.0)
} else {
font_size *= 4.0 / 5.0
};
font_size = font_size.clamp(1.0, MAX_FONT_SIZE);
}
_ => (),
},
Event::MainEventsCleared => {
let w_size = window.inner_size();
if view_size != w_size {
window.resize_surface(&gl_surface, &gl_context);
old_school_gfx_glutin_ext::resize_views(
w_size,
&mut color_view,
&mut depth_view,
);
view_size = w_size;
}
encoder.clear(&color_view, [0.02, 0.02, 0.02, 1.0]);
let (width, height, ..) = color_view.get_dimensions();
let (width, height) = (f32::from(width), f32::from(height));
let scale = PxScale::from(font_size * window.scale_factor() as f32);
let section = Section::default()
.add_text(
Text::new(&text)
.with_scale(scale)
.with_color([0.8, 0.8, 0.8, 1.0]),
)
.with_bounds((width, height))
.with_layout(
Layout::default().line_breaker(BuiltInLineBreaker::AnyCharLineBreaker),
);
glyph_brush.queue(§ion);
glyph_brush
.use_queue()
.draw(&mut encoder, &color_view)
.unwrap();
encoder.flush(&mut device);
gl_surface.swap_buffers(&gl_context).unwrap();
device.cleanup();
if let Some(rate) = loop_helper.report_rate() {
window.set_title(&format!("{title} - {rate:.0} FPS"));
}
loop_helper.loop_start();
}
_ => (),
}
});
}