101 lines
2.8 KiB
Rust
101 lines
2.8 KiB
Rust
use std::time::Instant;
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use anyhow::Result;
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use imgui::{Context as ImguiContext, Ui};
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use imgui_winit_support::{HiDpiMode, WinitPlatform};
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use imgui_glium_renderer::Renderer as ImguiGliumRenderer;
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use winit::window::Window;
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use glium::Frame;
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use raidillon_render::{DisplayHandle, ECSRenderer};
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/// Convenience wrapper that owns all ImGui state required for integration with
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/// winit + glium.
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pub struct Gui {
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imgui: ImguiContext,
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platform: WinitPlatform,
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renderer: ImguiGliumRenderer,
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last_frame: Instant,
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}
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impl Gui {
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pub fn new(display: &DisplayHandle, window: &Window) -> Result<Self> {
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let mut imgui = ImguiContext::create();
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imgui.set_ini_filename(None);
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let mut platform = WinitPlatform::new(&mut imgui);
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platform.attach_window(imgui.io_mut(), window, HiDpiMode::Default);
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imgui.fonts().add_font(&[imgui::FontSource::DefaultFontData { config: None }]);
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let renderer = ImguiGliumRenderer::new(&mut imgui, display.as_inner())?;
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Ok(Self {
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imgui,
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platform,
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renderer,
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last_frame: Instant::now(),
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})
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}
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pub fn handle_event<T>(&mut self, window: &Window, event: &winit::event::Event<T>) {
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self.platform
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.handle_event(self.imgui.io_mut(), window, event);
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}
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pub fn prepare_frame(&mut self, window: &Window) {
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let now = Instant::now();
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self.imgui.io_mut().update_delta_time(now - self.last_frame);
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self.last_frame = now;
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self
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.platform
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.prepare_frame(self.imgui.io_mut(), window)
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.expect("failed to prepare imgui frame");
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}
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pub fn render(&mut self, target: &mut Frame, window: &Window) {
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let mut open = true;
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self.render_with(target, window, |ui| {
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ui.show_demo_window(&mut open);
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});
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}
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pub fn render_with<F>(&mut self, target: &mut Frame, window: &Window, build_ui: F)
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where
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F: FnOnce(&Ui),
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{
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let ui = self.imgui.frame();
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build_ui(&ui);
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self.platform.prepare_render(ui, window);
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let draw_data = self.imgui.render();
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self
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.renderer
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.render(target, draw_data)
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.expect("imgui rendering failed");
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}
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pub fn render_world<F>(&mut self, ecsr: &mut ECSRenderer, window: &Window, build_ui: F)
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where
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F: FnOnce(&Ui, &mut ECSRenderer),
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{
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let mut target = ecsr.renderer.display().draw();
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ecsr.render_into(&mut target);
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self.render_with(&mut target, window, |ui| {
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build_ui(ui, ecsr);
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});
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target.finish().expect("Failed to swap buffers");
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ecsr.renderer.set_colliders(None);
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}
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pub fn ui<F>(&mut self, build: F)
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where
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F: FnOnce(&Ui),
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{
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let ui = self.imgui.frame();
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build(&ui);
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}
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}
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