added pscopes

engine/core/src/engine.zig

@@ -5,6 +5,7 @@ const time = @import("engineTime.zig");
 const core = @import("core.zig");
 const jobs = @import("jobs.zig");
 const math = @import("math.zig");
+const pscopes = core.algorithm.pscopes;
 
 const tracy = @import("tracy").t;
 const p2 = @import("p2");
@@ -84,6 +85,10 @@ pub const Engine = struct {
 
     delegates: EngineDelegates,
 
+    rootTimer: std.time.Timer,
+    scopesContext: *pscopes.ScopesContext,
+    timeTilCalibration: f64 = 1.0, // in seconds
+    calibrationPeriod: f64 = 1.0, // in seconds
     first: bool = true,
 
     pub fn init(allocator: std.mem.Allocator) !@This() {
@@ -96,8 +101,10 @@ pub const Engine = struct {
             .lastEngineTime = 0.0,
             .jobManager = try JobManager.create(allocator),
             .eventors = .{},
+            .rootTimer = try std.time.Timer.start(),
             .frameNumber = 1,
             .exitListeners = .{},
+            .scopesContext = try pscopes.ScopesContext.create(allocator),
             // .nfdRuntime = try nfd.NFDRuntime.create(allocator, .{}),
             .delegates = EngineDelegates.init(allocator),
         };
@@ -113,6 +120,7 @@ pub const Engine = struct {
         self.jobManager.destroy();
 
         self.engineObjectsByName.deinit(self.allocator);
+        self.scopesContext.destroy();
 
         if (self.destroyListCore.items.len > 0) {
             var i: i32 = @intCast(self.destroyListCore.items.len - 1);
@@ -239,14 +247,18 @@ pub const Engine = struct {
 
         var z1 = tracy.ZoneN(@src(), "time updates");
 
+        var shouldCalibrate: bool = false;
+
         if (self.first) {
             self.first = false;
             self.engineStartTime = newTime;
             self.lastEngineTime = newTime;
             self.sessionStamp = std.time.microTimestamp();
+            shouldCalibrate = true;
         }
 
         if (newTime < self.lastEngineTime) {
+            try core.assertf(false, "negative deltaTime this should not be possible", .{});
             std.debug.print("Warning! negative deltaTime? clamping to 0.0 newTime: {d} lastEngineTime:{d}", .{
                 newTime,
                 self.lastEngineTime,
@@ -254,6 +266,16 @@ pub const Engine = struct {
         }
 
         self.deltaTime = @max(newTime - self.lastEngineTime, 0.0);
+
+        self.timeTilCalibration -= self.deltaTime;
+
+        if (self.timeTilCalibration < 0 or shouldCalibrate) {
+            const zcalibrate = core.tracy.ZoneN(@src(), "calibrate timing scopeContext");
+            self.scopesContext.calibrate();
+            zcalibrate.End();
+            self.timeTilCalibration = self.calibrationPeriod;
+        }
+
         math.rollingAverage(&self.averageFrameTime, self.deltaTime, @floatFromInt(self.averageFrameSampleWindow));
         z1.End();
 

engine/core/src/engineTime.zig

@@ -1,13 +1,15 @@
 const std = @import("std");
 
 const core = @import("core.zig");
+const pscopes = core.algorithm.pscopes;
 
-// todo, replace with monotonic timer
+// returns time since engine started in nanoseconds
 pub fn getEngineTime() f64 {
-    return @as(f64, @floatFromInt(std.time.milliTimestamp())) / 1000;
+    const read = core.getEngine().rootTimer.read();
+    return @as(f64, @floatFromInt(read)) / std.time.ns_per_s;
 }
 
-// return the current system timestamp in nanoseconds
-pub fn getEngineTimeStamp() i128 {
-    return std.time.nanoTimestamp();
+// returns a pscopes.TimingScope for the current time.
+pub fn takeProfilingStamp() pscopes.TimingScope {
+    return core.getEngine().scopesContext.stampScope();
 }

engine/core/src/scene.zig

@@ -305,6 +305,8 @@ pub const SceneSystem = struct {
     cachedOutputs: std.ArrayList(std.ArrayList(core.Transform)) = .{},
     writeOutList: std.ArrayList(std.ArrayList(usize)) = .{},
 
+    lastUpdateTransformTime: f64 = 0.0,
+
     pub const Field = SceneObjectSet.Field;
     pub const FieldType = SceneObjectSet.FieldType;
 
@@ -354,7 +356,21 @@ pub const SceneSystem = struct {
         // then iterate over dynamicObjects array instead
 
         if (useParallelJob) {
-            core.parallelJob(UpdateWorldTransformsJob{}, false, 6) catch unreachable;
+            // we use 6 workers if the last timing scope ran > 2ms
+            // otherwise use 1 worker
+            var scope = core.engineTime.takeProfilingStamp();
+            var workerCount: u32 = 1;
+
+            if (self.lastUpdateTransformTime > 0.001) // 1ms
+            {
+                workerCount = 6;
+            }
+
+            core.parallelJob(UpdateWorldTransformsJob{}, false, workerCount) catch unreachable;
+            scope.end();
+            if (scope.duration()) |duration| {
+                self.lastUpdateTransformTime = duration;
+            }
         } else {
             for (Scene.SceneObjectContainer.denseItems(._repr), 0..) |*repr, i| {
                 const settings = Scene.SceneObjectContainer.readDense(i, .settings);

lib/p2/src/structures/pscopes.zig

@@ -88,7 +88,8 @@ pub const ScopesContext = struct {
 
     // calibrates the ticks per second divider.
     // spins for 1 ms then compares against the monotonic timer
-    // should be called once every second
+    // should be called once every second, this is kinda perscriptive,
+    // calling it more frequently will increase accuracy
     pub fn calibrate(self: *@This()) void {
         if (builtin.target.cpu.arch == .x86_64) {
             self.timer.reset();

lib/tracy/build.zig

@@ -11,7 +11,7 @@ pub fn build(b: *std.Build) void {
 
     //const tracy_enabled = b.option(bool, "tracy", "Enables tracy integration") orelse false;
 
-    const tracy_enabled: bool = false; //if (b.graph.env_map.hash_map.get("WITH_TRACY") != null) true else false;
+    const tracy_enabled: bool = true; //if (b.graph.env_map.hash_map.get("WITH_TRACY") != null) true else false;
     // if (b.graph.env_map.hash_map.get("WITH_TRACY")) |with_tracy| {
     //     tracy_enabled = with_tracy;
     // }

projects/sampleGame/externGame/externGame.zig

@@ -35,6 +35,8 @@ pub fn start_module(args: core.ModuleLoaderArgs) !void {
 
     core.engine_log("this change definitely happened  :^) ", .{});
 
+    core.engine_log("this change definitely happened  :^) ", .{});
+
     _ = args;
     core.logDisplay("externGame", "accessing old object at {x} same object? {d}", .{ @intFromPtr(core.EngineObject(ExternGameObject).get()), @sizeOf(ExternGameObject) });
 }
@@ -549,6 +551,8 @@ pub const ExternGameObject = struct {
                     core.MemoryTracker.dumpTimeline("timeline.txt") catch unreachable;
                 }
 
+                ig.textf("parallel scene time {d:.4}ms", .{core.get(core.SceneSystem).lastUpdateTransformTime * 1000});
+
                 if (ig.checkbox("vectors test", &self.displayVectorsTest)) {}
                 if (ig.checkbox("showdebug", &ui.context().screenContext.drawDebug)) {}