1 files changed, 143 insertions, 0 deletions
diff --git a/src/eguictx.rs b/src/eguictx.rs
new file mode 100644
index 0000000..572d352
--- /dev/null
+++ b/src/eguictx.rs
@@ -0,0 +1,143 @@
+use egui::{Context};
+use egui_wgpu::Renderer;
+use egui_winit::{EventResponse, State};
+use wgpu::{CommandEncoder, CommandEncoderDescriptor, Operations, RenderPassDescriptor, TextureView};
+use winit::{event::WindowEvent, window::{Theme, Window}};
+
+use crate::wgpuctx::WgpuCtx;
+
+
+pub struct EguiCtx {
+    state: State,
+    renderer: Renderer,
+    context: Context,
+    ready: bool
+}
+
+impl EguiCtx
+{
+    pub fn new(
+        window: &winit::window::Window,
+        wgpuctx: &WgpuCtx)
+    -> Self {
+        let ctx = egui::Context::default();
+
+        let viewport_id = ctx.viewport_id();
+        let state = egui_winit::State::new(
+            ctx.clone(),
+            viewport_id,
+            window,
+            Some(window.scale_factor() as _),
+            Some(Theme::Light),
+            None);
+
+        let renderer = Renderer::new(
+            wgpuctx.device(),
+            wgpuctx.surface_config().format,
+            egui_wgpu::RendererOptions {
+                depth_stencil_format: None,
+                msaa_samples: 1,
+                ..Default::default()
+            }
+        );
+
+        Self {
+            context: ctx,
+            state: state,
+            renderer: renderer,
+            ready: false
+        }
+    }
+
+    pub fn context(&self) -> &Context
+    { self.state.egui_ctx() }
+
+    pub fn window_event(
+        &mut self,
+        window: &Window,
+        event: &WindowEvent)
+    -> EventResponse
+    {
+        self.state.on_window_event(window, event)
+    }
+
+    pub fn prepare(
+        &mut self,
+        window: &Window)
+    {
+        let raw_input = self.state.take_egui_input(window);
+        self.context().begin_pass(raw_input);
+        self.ready = true;
+    }
+
+    pub fn present(
+        &mut self,
+        window: &Window,
+        wgpuctx: &WgpuCtx,
+        encoder: &mut CommandEncoder,
+        view: &TextureView)
+
+    {
+        if !self.ready {
+            return;
+        }
+        self.ready = false;
+
+        let full_output = self.context().end_pass();
+        self.state.handle_platform_output(window, full_output.platform_output);
+
+        let jobs = self.context().tessellate(
+            full_output.shapes,
+            full_output.pixels_per_point
+            );
+        
+        let screen_descriptor = {
+            let view_size = view.texture().size();
+            let (width, height) = (view_size.width, view_size.height);
+            egui_wgpu::ScreenDescriptor {
+                size_in_pixels: [width, height],
+                pixels_per_point: full_output.pixels_per_point
+            }
+        };
+
+        for (id, image_delta) in full_output.textures_delta.set {
+            self.renderer.update_texture(wgpuctx.device(), wgpuctx.queue(), id, &image_delta);
+        }
+
+        self.renderer.update_buffers(
+            wgpuctx.device(),
+            wgpuctx.queue(),
+            encoder,
+            &jobs,
+            &screen_descriptor
+        );
+        
+        {
+        let mut render_pass = encoder.begin_render_pass(&RenderPassDescriptor {
+            label: Some("EguiCtx render pass"),
+            color_attachments: &[Some(wgpu::RenderPassColorAttachment {
+                view: view,
+                resolve_target: None,
+                ops: Operations {
+                    load: wgpu::LoadOp::Load,
+                    store: wgpu::StoreOp::Store
+                },
+                depth_slice: None
+            })],
+            depth_stencil_attachment: None,
+            timestamp_writes: None,
+            occlusion_query_set: None
+        });
+
+        self.renderer.render(
+            &mut render_pass.forget_lifetime(), 
+            &jobs, 
+            &screen_descriptor
+            );
+        }
+
+        for id in &full_output.textures_delta.free {
+            self.renderer.free_texture(id);
+        }
+    }
+}