I like the way this renders, but the implementation is an absolute disaster...

src/main.rs

@@ -59,7 +59,7 @@ use crate::imgui_supp::extended_winit_imgui_support;
 use crate::imgui_supp::imgui_support::{ImguiContext, ImguiPlatform};
 use crate::owned_event::{OwnedEvent, OwnedEventExtension};
 use crate::physics::state::PhysicsState;
-use crate::render::system::ImguiPerformanceProfiler;
+use crate::render::system::ImguiPerformanceProfilerLine;
 use crate::runtime::state::RuntimeState;
 
 mod camera;
@@ -118,6 +118,8 @@ pub unsafe fn current_ui<'a>() -> Option<&'a imgui::Ui<'a>> {
     CURRENT_UI.as_ref()
 }
 
+
+
 fn main() {
     let logger = env_logger::builder()
         .filter(Some("minimal_viable_game_engine"), LevelFilter::Info)
@@ -158,44 +160,7 @@ fn main() {
 
     let mut resources = Resources::default();
 
-    let entity: Entity = world.push((
-        ImguiWindow {
-            // a window that does everything for the performance profiler
-            window: || {
-                imgui::Window::new(im_str!("Performance Profiler"))
-                    .size([400.0, 500.0], Condition::FirstUseEver)
-                    .position([50.0, 50.0], Condition::FirstUseEver)
-            },
-            func: |ui: &Ui, a: &ImguiPerformanceProfiler| {
-                ui.plot_lines(im_str!("blah"), &a.list_of_fps)
-                    .graph_size([200.0, 200.0])
-                    .scale_min(0.0)
-                    .scale_min(0.01).build();
-                ui.text(im_str!("blah blah blah {:?}", a.top_text));
 
-                let draw_list = ui.get_window_draw_list();
-                let o = ui.cursor_screen_pos();
-                let ws = ui.content_region_avail();
-                a.list_of_fps.iter().fold((0, 0.0f32), |accum, &b| {
-                    let b = b / 10.0;
-                    let x1 = accum.0 as f32 * 1.0 + o[0];
-                    let x2 = (accum.0 as f32 + 1.0) * 1.0 + o[0];
-                    let p1 = [x1, accum.1 + o[1]];
-                    let p2 = [x2, accum.1 + b + o[1]];
-                    draw_list
-                        .add_line(p1, p2, [128.0,64.0,0.0])
-                        .thickness(1.0)
-                        .build();
-                    (accum.0 + 1, b)
-                });
-            },
-        },
-        ImguiPerformanceProfiler {
-            top_text: "FPS".to_string(),
-            list_of_fps: [0.0; 400],
-            index: 0,
-        },
-    ));
 
     // Load up all the resources
     {
@@ -335,6 +300,7 @@ fn main() {
                 event: winit_24::event::DeviceEvent::Key(keyboard_input),
                 ..
             } => {
+                if keyboard_input.virtual_keycode.is_some() {
                     match keyboard_input.virtual_keycode.unwrap() {
                         VirtualKeyCode::Escape => {
                             if keyboard_input.state == ElementState::Pressed {
@@ -346,6 +312,7 @@ fn main() {
                         _ => (),
                     }
                 }
+            }
             event::Event::WindowEvent {
                 event: WindowEvent::CloseRequested,
                 ..

src/render/system.rs

@@ -31,6 +31,8 @@ use crate::imgui_supp::imgui_support::{ImguiContext, ImguiPlatform};
 use crate::light::{DirectionalLight, LightRaw};
 use crate::render::state::{RenderState};
 use crate::render::{push_debug_group_checked, insert_debug_marker_checked, pop_debug_group_checked, EntityUniforms};
+use std::iter::Chain;
+use std::slice::Iter;
 
 
 #[system]
@@ -55,13 +57,13 @@ pub fn imgui_prepare(
 
 /// Go through each "global" window-data component and render it's data
 #[system]
-#[write_component(ImguiWindow<ImguiPerformanceProfiler>)]
+#[write_component(ImguiWindow<ImguiPerformanceProfilerLine>)]
-#[write_component(ImguiPerformanceProfiler)]
+#[write_component(ImguiPerformanceProfilerLine)]
 pub fn render_imgui(world: &mut SubWorld, #[resource] loop_state: &mut LoopState) {
 
     let ui = unsafe { crate::current_ui().unwrap() };
 
-    let mut query = <(&ImguiPerformanceProfiler, &mut ImguiWindow<ImguiPerformanceProfiler>)>::query();
+    let mut query = <(&ImguiPerformanceProfilerLine, &mut ImguiWindow<ImguiPerformanceProfilerLine>)>::query();
     for (state, mut window) in query.iter_mut(world) {
         let new_window = (window.window)();
         new_window.build(&ui, || { (window.func)(ui, state) });
@@ -71,17 +73,56 @@ pub fn render_imgui(world: &mut SubWorld, #[resource] loop_state: &mut LoopState
 
 
 // This would be the shared state for all imgui performance window things
-pub struct ImguiPerformanceProfiler {
+pub struct ImguiPerformanceProfilerLine {
-    pub top_text: String,
+    pub label: String,
-    pub list_of_fps: [f32; 400],
+    list_of_fps: [f32; 400],
-    pub index: usize
+    index: usize,
+    scale_min: f32,
+    pub scale_max: f32,
 }
 
+impl ImguiPerformanceProfilerLine {
+    fn add_sample(&mut self, sample: f32) {
+
+        self.list_of_fps[self.index] = sample;
+
+        if self.index >= 399 {
+            self.scale_max = self.list_of_fps.iter().cloned().fold(0./0., f32::max);
+            self.index = 0;
+        } else {
+            self.index += 1;
+        }
+
+        if self.scale_max < sample {
+            self.scale_max = sample;
+        }
+    }
+
+    pub fn iter_data_from_head(&self) -> Chain<Iter<f32>, Iter<f32>> {
+        let (left, right) = self.list_of_fps.split_at(self.index);
+        right.iter().chain(left.iter())
+    }
+
+    pub fn current_average_label(&self) -> (f32, String) {
+        let (left, right) = self.list_of_fps.split_at(self.index);
+        ((left.iter().rev().chain(right.iter().rev()).take(50).sum::<f32>() / 50.0), "FPS".to_string())
+    }
+
+    pub fn new(label: String) -> ImguiPerformanceProfilerLine {
+        ImguiPerformanceProfilerLine {
+            label,
+            list_of_fps: [0.0; 400],
+            index: 0,
+            scale_min: 0.0,
+            scale_max: 0.0
+        }
+    }
+}
 
 #[system]
 #[write_component(Camera)]
 #[write_component(Position)]
-#[write_component(ImguiPerformanceProfiler)]
+#[write_component(ImguiPerformanceProfilerLine)]
 #[write_component(Point3<f32>)]
 #[write_component(Mesh)]
 #[write_component(DirectionalLight)]
@@ -94,21 +135,10 @@ pub fn render_test(
     #[resource] imgui_platform: &mut Arc<Mutex<ImguiPlatform>>,
 ) {
 
-    let mut query = <(&mut ImguiPerformanceProfiler)>::query();
+    let mut query = <(&mut ImguiPerformanceProfilerLine)>::query();
     for (mut profiler) in query.iter_mut(world) {
         let delta_time = loop_state.delta_time.as_secs_f32();
-        let profiler :&mut ImguiPerformanceProfiler = profiler; // trick clion into giving me the type, ugh
+        profiler.add_sample(delta_time);
-
-
-        profiler.top_text = (profiler.list_of_fps.iter().sum::<f32>() / profiler.list_of_fps.len() as f32).to_string();
-
-        profiler.list_of_fps[profiler.index] = 1.0 / delta_time;
-
-        if profiler.index >= 399 {
-            profiler.index = 0;
-        } else {
-            profiler.index += 1;
-        }
     }
 
     let mut encoder = renderer

src/runtime/system.rs

@@ -3,7 +3,8 @@ use std::path::PathBuf;
 use std::time::Instant;
 
 use cgmath::{Deg, Euler, Point3, Quaternion, Rad};
-use imgui::FontSource;
+use imgui::*;
+use imgui::{Condition, FontSource, Ui};
 use legion::systems::CommandBuffer;
 use legion::world::SubWorld;
 use legion::IntoQuery;
@@ -17,16 +18,76 @@ use rapier3d::na::{Isometry3, Vector, Vector3};
 use rapier3d::pipeline::{ChannelEventCollector, PhysicsPipeline};
 
 use crate::camera::{Camera, CameraController};
-use crate::components::{Collider, LoopState, Mesh, Physics, Position};
+use crate::components::{Collider, ImguiWindow, LoopState, Mesh, Physics, Position};
 use crate::geometry::RawMesh;
 use crate::physics::state::PhysicsState;
 use crate::render::state::RenderState;
+use crate::render::system::ImguiPerformanceProfilerLine;
 use crate::runtime::state::RuntimeState;
 
+pub fn quad_color(color: [f32; 4]) -> [[f32; 4]; 4] {
+    [color, color, color, color]
+}
+
 #[system]
 #[write_component(Mesh)]
-pub fn runtime_load(world: &mut SubWorld, #[resource] runtime_state: &mut RuntimeState) {
+pub fn runtime_load(
+    cmd: &mut CommandBuffer,
+    world: &mut SubWorld,
+    #[resource] runtime_state: &mut RuntimeState,
+) {
     runtime_state.preload_meshes(PathBuf::from("./resources"));
+
+    let entity: Entity = cmd.push((
+        ImguiWindow {
+            // a window that does everything for the performance profiler
+            window: || {
+                imgui::Window::new(im_str!("Performance Profiler"))
+                    .size([400.0, 500.0], Condition::FirstUseEver)
+                    .position([50.0, 50.0], Condition::FirstUseEver)
+            },
+            func: |ui: &Ui, a: &ImguiPerformanceProfilerLine| {
+                ui.text(im_str!("Performance Graph"));
+
+                let draw_list = ui.get_window_draw_list();
+                let top_left = ui.cursor_screen_pos();
+                let region_size = ui.content_region_avail();
+
+                // Fill rect
+                let qcolor = quad_color([0.5, 0.5, 1.0, 0.1]);
+                draw_list.add_rect_filled_multicolor(
+                    top_left,
+                    [top_left[0] + (region_size[0] - region_size[0]/5.0), top_left[1] + region_size[1]],
+                    qcolor[0],
+                    qcolor[1],
+                    qcolor[2],
+                    qcolor[3],
+                );
+
+                let x_scale = (region_size[0] - region_size[0]/5.0) / 400.0;
+                let y_scale = region_size[1] / a.scale_max;
+                a.iter_data_from_head()
+                    .fold((0, 0.0f32), |accum, &fps_val| {
+                        let x1 = accum.0 as f32 * x_scale + top_left[0];
+                        let y1 = top_left[1] + region_size[1] - accum.1 * y_scale;
+                        let x2 = (accum.0 as f32 + 1.0) * x_scale + top_left[0];
+                        let y2 = top_left[1] + region_size[1] - fps_val * y_scale;
+                        let p1 = [x1, y1];
+                        let p2 = [x2, y2];
+                        draw_list
+                            .add_line(p1, p2, [1.0, 1.0, 0.0])
+                            .thickness(1.0)
+                            .build();
+                        (accum.0 + 1, fps_val)
+                    });
+
+                let text_x = (region_size[0] - region_size[0]/5.0 + 75.0);
+                let text_y = top_left[1] + region_size[1] - a.current_average_label().0 * y_scale;
+                draw_list.add_text([text_x, text_y], [1.0,1.0,0.0,1.0], format!("{} {:.0}",a.current_average_label().1, 1.0/a.current_average_label().0));
+            },
+        },
+        ImguiPerformanceProfilerLine::new("RenderFFS".to_string()),
+    ));
 }
 
 #[system]