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Add accurate framerate to basic example

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John-Mark Allen 2021-06-21 21:16:42 +01:00 committed by Jack Spira
parent f70ddfa29e
commit fc82d41154
1 changed files with 11 additions and 0 deletions
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11
imgui-glow-renderer/examples/01_basic.rs
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@ -1,6 +1,8 @@
//! A basic self-contained example to get you from zero-to-demo-window as fast //! A basic self-contained example to get you from zero-to-demo-window as fast
//! as possible. //! as possible.
use std::time::Instant;
use glow::HasContext; use glow::HasContext;
use glutin::{event_loop::EventLoop, WindowedContext}; use glutin::{event_loop::EventLoop, WindowedContext};
use imgui_winit_support::WinitPlatform; use imgui_winit_support::WinitPlatform;
@ -23,10 +25,19 @@ fn main() {
let mut ig_renderer = imgui_glow_renderer::auto_renderer(gl, &mut imgui_context) let mut ig_renderer = imgui_glow_renderer::auto_renderer(gl, &mut imgui_context)
.expect("failed to create renderer"); .expect("failed to create renderer");
let mut last_frame = Instant::now();
// Standard winit event loop // Standard winit event loop
event_loop.run(move |event, _, control_flow| { event_loop.run(move |event, _, control_flow| {
*control_flow = glutin::event_loop::ControlFlow::Wait; *control_flow = glutin::event_loop::ControlFlow::Wait;
match event { match event {
glutin::event::Event::NewEvents(_) => {
let now = Instant::now();
imgui_context
.io_mut()
.update_delta_time(now.duration_since(last_frame));
last_frame = now;
}
glutin::event::Event::MainEventsCleared => { glutin::event::Event::MainEventsCleared => {
winit_platform winit_platform
.prepare_frame(imgui_context.io_mut(), window.window()) .prepare_frame(imgui_context.io_mut(), window.window())