Debug FPS display with rendering backend info

src/main.rs

@@ -394,6 +394,8 @@ struct App {
     ws_id: i32,
     match_mode: bool,
     coop: bool,
+    fps: f32,
+    renderer: String,
 }
 
 impl App {
@@ -600,7 +602,7 @@ async fn main() {
     let seed = (miniquad::date::now() * 1000.0) as u32 | 1;
     // behind the title menu: the endless bridge battle
     let (game, cam) = Game::new_demo(seed);
-    let mut app = App { game, cam, settings, seed, status: None, recorded: false, client: MatchClient::new(), ws_id: 0, match_mode: false, coop: false };
+    let mut app = App { game, cam, settings, seed, status: None, recorded: false, client: MatchClient::new(), ws_id: 0, match_mode: false, coop: false, fps: 0.0, renderer: platform::renderer() };
     menu.progress = platform::storage_get(PROGRESS_KEY).and_then(|s| serde_json::from_str(&s).ok()).unwrap_or_default();
     app.game.hints = app.settings.hints;
     let mut inp = Input { ldown: None, rdown: None, rlast: (0.0, 0.0), rdrag: false, mlast: None, minimap_drag: false, tlast: None, touch_world: false, inspect: None };
@@ -614,8 +616,11 @@ async fn main() {
     let mut cache_t = 0.0f32;
 
     loop {
-        let dt = get_frame_time().min(0.1);
+        let raw_dt = get_frame_time();
+        let dt = raw_dt.min(0.1);
         let now = get_time();
+        let fps_now = 1.0 / raw_dt.max(0.001);
+        app.fps = if app.fps <= 0.0 { fps_now } else { app.fps + (fps_now - app.fps) * 0.08 };
         let mut settings_changed = false;
 
         // ---------------- touch or mouse: which interface is active
@@ -1423,4 +1428,32 @@ fn draw_frame(app: &mut App, gfx: &Gfx, r3d: &mut R3d, ui: &mut Ui, menu: &mut M
     if !touch {
         ui.draw_cursor(gfx, &app.game, now, blocked);
     }
+    if app.settings.debug_fps {
+        draw_debug_fps(app, gfx);
+    }
+}
+
+fn draw_debug_fps(app: &App, gfx: &Gfx) {
+    ui::begin_ui();
+    let scale = ui::SMALL().max(1.0);
+    let fps = app.fps.max(0.0).round() as i32;
+    let renderer = {
+        let r = app.renderer.trim();
+        if r.is_empty() {
+            if cfg!(target_arch = "wasm32") {
+                "WebGL"
+            } else {
+                "OpenGL"
+            }
+        } else {
+            r
+        }
+    };
+    let max_cols = (((ui::sw() - 6.0) / ui::CW()).floor() as i32).max(12) as usize;
+    let line: String = format!("{} FPS  {}", fps, renderer).chars().take(max_cols).collect();
+    let w = gfx.measure(&line, scale);
+    let x = (ui::sw() - w - 2.0).max(2.0);
+    let y = 2.0;
+    draw_rectangle(x - 2.0, y - 2.0, w + 4.0, scale * 10.0 + 4.0, Color::from_rgba(0, 0, 0, 150));
+    gfx.text(&line, x, y, scale, GOLD);
 }

src/menu.rs

@@ -50,6 +50,7 @@ pub enum Item {
     Lights,
     UiScale,
     RenderScale,
+    DebugFps,
     GameSpeed,
     Hints,
     TouchUi,
@@ -62,7 +63,7 @@ fn tab_items(tab: usize) -> &'static [Item] {
         0 => &[Language, Volume, MusicVolume, Mute, Voice],
         1 => &[RotateSpeed, PanSpeed, ZoomSpeed, EdgeScroll, InvertMouse],
         2 => &[Outlines, WallDetail, Lights, UiScale, RenderScale],
-        3 => &[GameSpeed, Hints, TouchUi],
+        3 => &[GameSpeed, Hints, TouchUi, DebugFps],
         _ => &[],
     }
 }
@@ -83,6 +84,7 @@ fn item_label(it: Item) -> String {
         Item::Lights => "set.lights",
         Item::UiScale => "set.ui_scale",
         Item::RenderScale => "set.render_scale",
+        Item::DebugFps => "set.debug_fps",
         Item::GameSpeed => "set.game_speed",
         Item::Hints => "set.hints",
         Item::TouchUi => "set.touch_ui",
@@ -124,6 +126,7 @@ fn item_value(it: Item, s: &Settings) -> String {
                 format!("{}x", s.ui_factor)
             }
         }
+        Item::DebugFps => onoff(s.debug_fps),
         Item::RenderScale => {
             // the setting is for a 1080 pixel high window; show what applies to this one
             let now = crate::render3d::effective_div(s.render_scale.max(1) as u32, crate::ui::sh());
@@ -174,6 +177,7 @@ fn item_change(it: Item, s: &mut Settings, d: i32) {
         Item::Lights => s.max_lights = cycle(&[8u8, 16, 24], s.max_lights, d),
         Item::UiScale => s.ui_factor = cycle(&[0u8, 1, 2, 3, 4], s.ui_factor, d),
         Item::RenderScale => s.render_scale = cycle(&(1u8..=16).collect::<Vec<u8>>(), s.render_scale.clamp(1, 16), d),
+        Item::DebugFps => s.debug_fps = !s.debug_fps,
         Item::GameSpeed => s.game_speed = cycle(&[1.0f32, 2.0], s.game_speed, d),
         Item::Hints => s.hints = !s.hints,
         Item::TouchUi => s.touch_ui = cycle(&[0u8, 1, 2], s.touch_ui, d),

src/platform.rs

@@ -35,6 +35,7 @@ mod imp {
         fn dc_ws_send(id: i32, p: *const u8, pl: u32) -> i32;
         fn dc_ws_take(id: i32) -> i32;
         fn dc_ws_close(id: i32);
+        fn dc_renderer() -> i32;
     }
 
     // starts a request; poll the returned id with http_poll()
@@ -171,6 +172,18 @@ mod imp {
             unsafe { dc_ws_close(id) }
         }
     }
+
+    pub fn renderer() -> String {
+        unsafe {
+            let n = dc_renderer();
+            if n < 0 {
+                return String::new();
+            }
+            let mut buf = vec![0u8; n as usize];
+            dc_storage_take(buf.as_mut_ptr());
+            String::from_utf8(buf).unwrap_or_default()
+        }
+    }
 }
 
 #[cfg(not(target_arch = "wasm32"))]
@@ -233,6 +246,21 @@ mod imp {
         None
     }
     pub fn ws_close(_id: i32) {}
+
+    pub fn renderer() -> String {
+        #[cfg(target_vendor = "apple")]
+        {
+            use macroquad::miniquad::conf::AppleGfxApi;
+            return match macroquad::miniquad::window::apple_gfx_api() {
+                AppleGfxApi::Metal => "Metal".into(),
+                AppleGfxApi::OpenGl => "OpenGL".into(),
+            };
+        }
+        #[cfg(not(target_vendor = "apple"))]
+        {
+            return "OpenGL".into();
+        }
+    }
 }
 
 pub use imp::*;

src/settings.rs

@@ -150,6 +150,7 @@ pub struct Settings {
     pub ui_factor: u8,   // interface size: 0 = automatic, 1..4 = fixed integer factor
     pub render_scale: u8, // 3D world resolution divisor: 1 = full, 2..16 = pixel look
     pub touch_ui: u8,     // touch interface: 0 = automatic (after the first touch), 1 = on, 2 = off
+    pub debug_fps: bool,  // show FPS and rendering backend
     // game
     pub game_speed: f32, // 1 or 2
     pub hints: bool,
@@ -179,6 +180,7 @@ impl Default for Settings {
             ui_factor: 0,
             render_scale: 1,
             touch_ui: 0,
+            debug_fps: false,
             game_speed: 1.0,
             hints: true,
             difficulty: 1,
@@ -225,3 +227,19 @@ impl Settings {
         serde_json::from_str(s).ok()
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn debug_fps_round_trips() {
+        let mut s = Settings::default();
+        assert!(!s.debug_fps);
+        s.debug_fps = true;
+        let l = Settings::from_json(&s.to_json()).expect("settings serialize back");
+        assert!(l.debug_fps);
+        let old = Settings::from_json(r#"{"language":"en","map_w":64,"map_h":64}"#).expect("old settings remain readable");
+        assert!(!old.debug_fps);
+    }
+}