Fin

GlitchyEngine/src/GameTime.bf

@@ -28,6 +28,9 @@ namespace GlitchyEngine
 		 */
 		public uint64 FrameCount => _frameCount;
 
+		/// The interval in seconds from the last frame to the current one.
+		public float DeltaTime => (float)_frameTime.TotalSeconds;
+
 		/**
 		 * Initializes a new instance of a GameTime.
 		 */

GlitchyEngine/src/Platform/Windows/WindowsWindow.bf

@@ -250,6 +250,18 @@ namespace GlitchyEngine
 		[CLink]
 		static extern IntBool IsWindowUnicode(HWND whnd);
 
+		public Result<void> SetIcon(StringView filePath)
+		{
+			HICON hIcon = LoadImageW(0, filePath.ToScopedNativeWChar!(), .Icon, 0, 0, .LoadFromFile);
+			if (hIcon == 0)
+				return .Err;
+
+			// WM_SETICON 0x0080
+			SendMessageW(_windowHandle, 0x0080, 1 /* ICON_BIG */, (int)hIcon);
+
+			return .Ok;
+		}
+
 		private static LRESULT MessageHandler(HWND hwnd, uint32 uMsg, WPARAM wParam, LPARAM lParam)
 		{
 			void* windowPtr = (void*)GetWindowLongPtrW(hwnd, GWL_USERDATA);

GlitchyEngine/src/Renderer/Renderer2D.bf

@@ -133,6 +133,9 @@ namespace GlitchyEngine.Renderer
 		private static Effect s_currentEffect;
 		private static Effect s_currentCircleEffect;
 
+		private static int s_InstancesPerDrawCall = 1024;
+		private static int s_MaxInstancesPerDrawCall = 8192;
+
 		private static void InitEffect()
 		{
 			Debug.Profiler.ProfileFunction!();
@@ -204,10 +207,10 @@ namespace GlitchyEngine.Renderer
 	
 				s_batchBinding.SetVertexBufferSlot(s_instanceBuffer, 1);
 	
-				s_rawInstances = new BatchVertex[1024];
+				s_rawInstances = new BatchVertex[s_InstancesPerDrawCall];
 				s_setInstances = 0;
 	
-				s_instanceQueue = new List<QueueQuad>(1024);
+				s_instanceQueue = new List<QueueQuad>(s_InstancesPerDrawCall);
 			}
 			
 			{
@@ -240,9 +243,9 @@ namespace GlitchyEngine.Renderer
 
 				s_circleBatchBinding.SetVertexBufferSlot(s_circleInstanceBuffer, 1);
 	
-				s_rawCircleInstances = new CircleBatchVertex[1024];
+				s_rawCircleInstances = new CircleBatchVertex[s_InstancesPerDrawCall];
 
-				s_circleInstanceQueue = new List<QueueCircle>(1024);
+				s_circleInstanceQueue = new List<QueueCircle>(s_InstancesPerDrawCall);
 			}
 		}
 
@@ -391,6 +394,11 @@ namespace GlitchyEngine.Renderer
 		private static void QueueQuadInstance(Matrix transform, ColorRGBA color, Texture2D texture, float depth, Vector4 uvTransform)
 		{
 			s_instanceQueue.Add(QueueQuad(transform, color, texture ?? s_whiteTexture, depth, uvTransform));
+
+			if (s_instanceQueue.Count >= s_MaxInstancesPerDrawCall)
+			{
+				Flush();
+			}
 		}
 		
 		/// Adds a circle instance to the instance queue.
@@ -398,6 +406,11 @@ namespace GlitchyEngine.Renderer
 		private static void QueueCircleInstance(Matrix transform, ColorRGBA color, Texture2D texture, float depth, Vector4 uvTransform, float innerRadius)
 		{
 			s_circleInstanceQueue.Add(QueueCircle(transform, color, texture ?? s_whiteTexture, depth, uvTransform, innerRadius));
+
+			if (s_circleInstanceQueue.Count >= s_MaxInstancesPerDrawCall)
+			{
+				Flush();
+			}
 		}
 		
 		private static void FlushInstances()
@@ -670,9 +683,9 @@ namespace GlitchyEngine.Renderer
 
 		public static void DrawCircle(Vector3 position, Vector2 size, Texture2D texture, ColorRGBA color = .White, float innerRadius = 1.0f, Vector4 uvTransform = .(0, 0, 1, 1))
 		{
-#if DEBUG
 			Debug.Profiler.ProfileRendererFunction!();
 
+#if DEBUG
 			Log.EngineLogger.AssertDebug(s_sceneRunning, "Missing call of BeginScene.");
 #endif
 				

GlitchyEngine/src/Window.bf

@@ -110,5 +110,10 @@ namespace GlitchyEngine
 		}
 
 		public extern void Update();
+
+		/**
+		 * Sets the Icon of the window to the given file.
+		 */
+		public extern Result<void> SetIcon(StringView filePath);
 	}
 }

Sandbox/BeefProj.toml

@@ -6,3 +6,6 @@ Name = "Sandbox"
 TargetType = "BeefGUIApplication"
 StartupObject = "GlitchyEngine.Program"
 ProcessorMacros = ["NOT_GAMMA_TEST", "SANDBOX_2D"]
+
+[Platform.Windows]
+IconFile = "$(ProjectDir)/content/RocketGame/RocketIcon.ico"

Sandbox/src/ColorHSV.bf

@@ -0,0 +1,43 @@
+using GlitchyEngine.Math;
+using System;
+namespace Sandbox
+{
+	struct ColorHSV
+	{
+		public float H;
+		public float S;
+		public float V;
+
+		public this(float h, float s, float v)
+		{
+			H = h;
+			S = s;
+			V = v;
+		}
+
+		public static explicit operator ColorRGB(ColorHSV hsv)
+		{
+			float c = hsv.V * hsv.S;
+			float x = c * (1.0f - Math.Abs((hsv.H / 60.0f) % 2.0f - 1.0f));
+
+			float m = hsv.V - c;
+
+			ColorRGB rgb_ = ?;
+
+			if (hsv.H < 60.0f)
+				rgb_ = ColorRGB(c, x, 0);
+			else if (hsv.H < 120.0f)
+				rgb_ = ColorRGB(x, c, 0);
+			else if (hsv.H < 180.0f)
+				rgb_ = ColorRGB(0, c, x);
+			else if (hsv.H < 240.0f)
+				rgb_ = ColorRGB(0, x, c);
+			else if (hsv.H < 300.0f)
+				rgb_ = ColorRGB(x, 0, c);
+			else if (hsv.H < 360.0f)
+				rgb_ = ColorRGB(c, 0, x);
+
+			return .(rgb_.Red + m, rgb_.Green + m, rgb_.Blue + m);
+		}
+	}
+}

Sandbox/src/GameLayer.bf

@@ -0,0 +1,229 @@
+using System;
+using GlitchyEngine;
+using GlitchyEngine.Events;
+using System.Diagnostics;
+using GlitchLog;
+using GlitchyEngine.ImGui;
+using ImGui;
+using GlitchyEngine.Renderer;
+using GlitchyEngine.Math;
+using GlitchyEngine.World;
+using GlitchyEngine.Renderer.Text;
+using System.IO;
+using msdfgen;
+using System.Collections;
+using System.Diagnostics;
+
+namespace Sandbox
+{
+	class GameLayer : Layer
+	{
+		GraphicsContext _context ~ _?.ReleaseRef();
+
+		BlendState _alphaBlendState ~ _?.ReleaseRef();
+
+		Font _font ~ _.ReleaseRef();
+
+		DepthStencilState _depthStencilState ~ _.ReleaseRef();
+
+		Rocket _rocket ~ delete _;
+
+		OrthographicCamera _camera ~ delete _;
+
+		List<Obstacle> _obstacles = new List<Obstacle>() ~ DeleteContainerAndItems!(_);
+
+		FontRenderer.PreparedText pressSpaceToStart ~ _.ReleaseRef();
+		FontRenderer.PreparedText pressSpaceToRestart ~ _.ReleaseRef();
+
+		ColorHSV worldColor = .(0, 0.5f, 1.0f);
+
+		[AllowAppend]
+		public this() : base("Example")
+		{
+			Application.Get().Window.IsVSync = false;
+
+			_context = Application.Get().Window.Context..AddRef();
+
+			BlendStateDescription blendDesc = .();
+			blendDesc.RenderTarget[0] = .(true, .SourceAlpha, .InvertedSourceAlpha, .Add, .SourceAlpha, .InvertedSourceAlpha, .Add, .All);
+			_alphaBlendState = new BlendState(blendDesc);
+
+			_font = new Font("C:\\Windows\\Fonts\\arial.ttf", 64, true, 'A', 16);
+
+			_camera = new .()
+				{
+					NearPlane = -10,
+					FarPlane = 10,
+					Height = 5,
+					Width = 5 * _context.SwapChain.AspectRatio
+				}..Update();
+
+			DepthStencilStateDescription dssDesc = .()
+				{
+					DepthEnabled = false
+				};
+			_depthStencilState = new DepthStencilState(dssDesc);
+
+			pressSpaceToStart = FontRenderer.PrepareText(_font, "Press [SPACE]", 1);
+
+			pressSpaceToRestart = FontRenderer.PrepareText(_font, "YOU DIED!\nPress [SPACE] to restart", 0.5f);
+
+			InitGame();
+		}
+
+		private void InitGame()
+		{
+			_rocket = new Rocket();
+			_rocket.Obstacles = _obstacles;
+
+			InitStarField();
+		}
+
+		Vector4[] points = new Vector4[1000] ~ delete _;
+
+		Random startRandom = new .() ~ delete _;
+
+		private void InitStarField()
+		{
+			for (int i < points.Count)
+			{
+				Vector4 v = .();
+				v.X = startRandom.Next(-1000, 1000) / 2000f * _camera.Width;
+				v.Y = startRandom.Next(-1000, 1000) / 2000f * _camera.Height;
+				v.Z = startRandom.Next(0, 1000) / 2000.0f;
+				v.W = startRandom.Next(1000, 3000) / 1000.0f;
+
+				points[i] = v;
+			}
+		}
+
+		private float lastObstacle = 0.0f;
+
+		public override void Update(GameTime gameTime)
+		{ 
+			worldColor.H += gameTime.DeltaTime * 18 * _rocket.FlightSpeed;
+ 			worldColor.H %= 360.0f;
+
+			ColorRGBA wColor = .((ColorRGB)worldColor, 1.0f);
+
+			float screenWidth = _camera.Width;
+			Obstacle.ScreenWidth = screenWidth / 2.0f;
+
+			lastObstacle += Obstacle.Speed * gameTime.DeltaTime;
+			
+			if (lastObstacle <= -Obstacle.ScreenWidth)
+			{
+				_obstacles.Add(new Obstacle());
+				lastObstacle += 2.5f;
+				_obstacles.Back.Position.X = Obstacle.ScreenWidth + 1.0f;
+				_obstacles.Back.Position.Y = Obstacle.random.Next(-1000, 1000) / 1000f;
+			}
+
+			for (int i < _obstacles.Count)
+			{
+				_obstacles[i].Update(gameTime);
+
+				if (_obstacles[i].Dead)
+				{
+					delete _obstacles[i];
+
+					_obstacles.RemoveAt(i);
+					i--;
+				}
+			}
+
+			_rocket.Update(gameTime);
+			Obstacle.Speed = -_rocket.FlightSpeed;
+
+			RenderCommand.Clear(null, .Black);
+			
+			// Draw test geometry
+			RenderCommand.SetRenderTarget(null);
+			RenderCommand.BindRenderTargets();
+
+			RenderCommand.SetViewport(_context.SwapChain.BackbufferViewport);
+
+			RenderCommand.SetBlendState(_alphaBlendState);
+			RenderCommand.SetDepthStencilState(_depthStencilState);
+			
+			Renderer2D.BeginScene(_camera, .BackToFront);
+			
+			DrawStartField(gameTime);
+			
+			Renderer2D.EndScene();
+			
+			Renderer2D.BeginScene(_camera, .BackToFront);
+
+			Renderer2D.DrawQuad(Vector3(0, 2.75f, 1), Vector2(screenWidth, 1), 0, wColor);
+
+			Renderer2D.DrawQuad(Vector3(0, -2.75f, 1), Vector2(screenWidth, 1), 0, wColor);
+			
+			for (Obstacle obs in _obstacles)
+			{
+				obs.Draw(wColor);
+			}
+
+			_rocket.Draw();
+
+			var scorePrep = FontRenderer.PrepareText(_font, scope $"{_rocket.Score}", 1.0f);
+
+			FontRenderer.DrawText(scorePrep, -scorePrep.AdvanceX / 2, 1.5f, .Black);
+			FontRenderer.DrawText(scorePrep, -scorePrep.AdvanceX / 2 + 0.1f, 1.6f, .(230, 230, 230));
+
+			scorePrep.ReleaseRef();
+
+			if (!_rocket.Started)
+			{
+				float f = (float)Math.Cos(gameTime.TotalTime.TotalSeconds) * 0.5f + 0.55f;
+
+				FontRenderer.DrawText(pressSpaceToStart, -pressSpaceToStart.AdvanceX / 2f, 0, .(1, 0, 0, f));
+			}
+
+			if (_rocket.Dead)
+			{
+				float f = (float)Math.Cos(gameTime.TotalTime.TotalSeconds) * 0.5f + 0.55f;
+
+				FontRenderer.DrawText(pressSpaceToRestart, -pressSpaceToRestart.AdvanceX / 2f, 0, .(1, 0, 0, f));
+			}
+
+			Renderer2D.EndScene();
+		}
+
+		private void DrawStartField(GameTime gameTime)
+		{
+			for (int i < points.Count)
+			{
+				points[i].X -= _rocket.FlightSpeed * gameTime.DeltaTime * points[i].Z;
+
+				if (points[i].X < _camera.Left)
+				{
+					points[i].X = _camera.Right + startRandom.Next(500, 1500) / 1000.0f;
+				}
+
+				Renderer2D.DrawCircle(Vector3(points[i].XY, 5), .(0.01f * points[i].W), Color.White);
+			}
+		}
+
+		public override void OnEvent(Event event)
+		{
+			EventDispatcher dispatcher = EventDispatcher(event);
+
+			dispatcher.Dispatch<ImGuiRenderEvent>(scope (e) => OnImGuiRender(e));
+
+			dispatcher.Dispatch<WindowResizeEvent>(scope (e) => OnWindowResize(e));
+		}
+
+		private bool OnImGuiRender(ImGuiRenderEvent e)
+		{
+			return false;
+		}
+
+		private bool OnWindowResize(WindowResizeEvent e)
+		{
+			_camera.Width = _camera.Height * e.Width / (float)e.Height;
+			_camera.Update();
+
+			return false;
+		}
+	}
+}

Sandbox/src/Line2D.bf

@@ -0,0 +1,213 @@
+using System;
+using GlitchyEngine.Math;
+namespace Sandbox
+{
+	struct Line2D
+	{
+		public Vector2 Start;
+		public Vector2 End;
+
+		public this(Vector2 start, Vector2 end)
+		{
+			Start = start;
+			End = end;
+		}
+
+		/// Returns true if the given point lies on the line.
+		public bool OnLine(Vector2 point)
+		{
+			Vector2 startToPoint = point - Start;
+			Vector2 startToEnd = End - Start;
+
+			float cross = cross(startToPoint, startToEnd);
+
+			if(!MathHelper.IsZero(cross))
+				return false;
+
+			if(Math.Abs(startToEnd.X) >= Math.Abs(startToEnd.Y))
+			{
+				return (startToEnd.X > 0.0f) ?
+					(Start.X <= point.X && point.X <= End.X) :
+					(End.X <= point.X && point.X <= Start.X);
+			}
+			else
+			{
+				return (startToEnd.Y > 0.0f) ?
+					(Start.Y <= point.Y && point.Y <= End.Y) :
+					(End.Y <= point.Y && point.Y <= Start.Y);
+			}
+		}
+
+		[Inline]
+		private float cross(Vector2 v, Vector2 w)
+		{
+			return v.X * w.Y - v.Y * w.X;
+		}
+
+		public enum LineIntersection
+		{
+			case Collinear(Line2D IntersectionLine);
+			case CollinearNoIntersect;
+			case Parallel;
+			case Intersection(Vector2 Point);
+			case None;
+		}
+		
+		private Result<(float Start, float End)> IntervalIntersection(float startA, float endA, float startB, float endB)
+		{
+			if(startB > endA || startA > endB)
+				return .Err;
+			else
+			{
+				float start = Math.Max(startA, startB);
+				float end = Math.Min(endA, endB);
+
+				return .Ok((start, end));
+			}
+		}
+
+		public LineIntersection Intersects(Line2D line)
+		{
+			Vector2 A = this.Start;
+			Vector2 B = this.End;
+			Vector2 C = line.Start;
+			Vector2 D = line.End;
+
+			float numR = ((A.Y-C.Y) * (D.X-C.X) - (A.X-C.X) * (D.Y-C.Y));
+			float den = ((B.X-A.X) * (D.Y-C.Y)-(B.Y-A.Y) * (D.X-C.X));
+
+			float r =  numR / den;
+			float s = ((A.Y-C.Y) * (B.X-A.X) - (A.X-C.X) * (B.Y-A.Y)) / den;
+
+			if((0 <= r && r <= 1) && (0 <= s && s <= 1))
+			{
+				Vector2 P = A + r * (B - A);
+
+				return .Intersection(P);
+			}
+			else if(MathHelper.IsZero(den))
+			{
+				if(MathHelper.IsZero(numR))
+				{
+					Vector2 AtoB = B - A;
+					Vector2 CtoD = D - C;
+
+					float r_dot_r = Vector2.Dot(AtoB, AtoB);
+
+					// t0 = (q − p) · r / (r · r)
+					float t0 = Vector2.Dot((C - A), AtoB) / r_dot_r;
+
+					// t1 = (q + s − p) · r / (r · r) = t0 + s · r / (r · r)
+					float t1 = t0 + Vector2.Dot(CtoD, AtoB) / r_dot_r;
+
+					// do interval intersection
+
+					if(Vector2.Dot(CtoD, AtoB) < 0)
+					{
+						Swap!(t0, t1);
+					}
+
+					if(IntervalIntersection(t0, t1, 0, 1) case .Ok(let intersection))
+					{
+						return .Collinear(Line2D(A + intersection.Start * AtoB, A + intersection.End * AtoB));
+					}
+					else
+					{
+						return .CollinearNoIntersect;
+					}
+				}
+				else
+				{
+					return .Parallel;
+				}
+			}
+
+			return .None;
+		}
+
+		public static void TestIntersects()
+		{
+
+			{
+				Line2D line = .(.(0, 0), .(4, 0));
+
+				Line2D intersecting = .(.(2, 2), .(2, -2));
+
+				var result = line.Intersects(intersecting);
+				Vector2 intersection;
+				Runtime.Assert(result case .Intersection(out intersection));
+				Runtime.Assert(intersection == .(2, 0));
+			}
+
+			{
+				Line2D line = .(.(0, -1), .(5, 2));
+
+				Line2D intersecting = .(.(1, 3), .(4, -2));
+
+				var result = line.Intersects(intersecting);
+				Vector2 intersection;
+				Runtime.Assert(result case .Intersection(out intersection));
+				Runtime.Assert(intersection == .(2.5f, 0.5f));
+			}
+
+			{
+				Line2D line = .(.(-1, 0), .(1, 0));
+
+				Line2D collinear = .(.(2, 0), .( 4, 0));
+
+				var result = line.Intersects(collinear);
+
+				Runtime.Assert(result case .CollinearNoIntersect);
+			}
+
+			{
+				Line2D line = .(.(-1, 0), .(2, 0));
+
+				Line2D collinear = .(.(1, 0), .( 4, 0));
+
+				var result = line.Intersects(collinear);
+				
+				Line2D intersection;
+				Runtime.Assert(result case .Collinear(out intersection));
+				
+				Runtime.Assert(intersection.Start == .(1, 0));
+				Runtime.Assert(intersection.End == .(2, 0));
+			}
+
+			{
+				Line2D line = .(.(-1, 5), .(2, 5));
+
+				Line2D collinear = .(.(4, 5), .(1, 5));
+
+				var result = line.Intersects(collinear);
+				
+				Line2D intersection;
+				Runtime.Assert(result case .Collinear(out intersection));
+
+				Runtime.Assert(intersection.Start == .(1, 5));
+				Runtime.Assert(intersection.End == .(2, 5));
+			}
+		}
+
+		/*
+		public bool Intersects(Line2D line)
+		{
+			float x1 = Start.X;
+			float x2 = End.X;
+			float x3 = line.Start.X;
+			float x4 = line.End.X;
+
+			float y1 = Start.Y;
+			float y2 = End.Y;
+			float y3 = line.Start.Y;
+			float y4 = line.End.Y;
+
+			float t = ((x1 - x3) * (y3 - y4) - (y1 - y3) * (x3 - x4)) / ((x1 - x2) * (y3 - y4) - (y1 - y2) * (x3 - x4));
+
+			float u = ((x1 - x3) * (y1 - y2) - (y1 - y3) * (x1 - x2)) / ((x1 - x2) * (y3 - y4) - (y1 - y2) * (x3 - x4));
+
+			return (0.0f <= t && t <= 1.0f && 0.0f <= u && u <= 1.0f);
+		}
+		*/
+	}
+}

Sandbox/src/Obstacle.bf

@@ -0,0 +1,46 @@
+using GlitchyEngine;
+using GlitchyEngine.Math;
+using GlitchyEngine.Renderer;
+using System;
+
+namespace Sandbox
+{
+	class Obstacle
+	{
+		public Vector2 Position;
+
+		public float HoleSize = 4.5f;
+
+		public static float Speed = -2.0f;
+
+		public static float ScreenWidth;
+
+		public static Random random = new .() ~ delete _;
+
+		public bool Dead;
+
+		public void Update(GameTime gameTime)
+		{
+			Position.X += Speed * gameTime.DeltaTime;
+
+			if (Position.X < -ScreenWidth - 1)
+			{
+				Dead = true;
+			}
+		}
+
+		static Matrix mat = Matrix.Scaling(2.5f, 5, 1) * Matrix.RotationZ(MathHelper.PiOverFour);
+
+		public void Draw(ColorRGBA color)
+		{
+			Matrix matty = mat;
+			matty.Translation.X = Position.X;
+
+			matty.Translation.Y = Position.Y - HoleSize;
+			Renderer2D.DrawQuad(matty, color);
+
+			matty.Translation.Y = Position.Y + HoleSize;
+			Renderer2D.DrawQuad(matty, color);
+		}
+	}
+}

Sandbox/src/ParticleSystem.bf

@@ -0,0 +1,133 @@
+using GlitchyEngine.Math;
+using GlitchyEngine;
+using System;
+using GlitchyEngine.Renderer;
+namespace Sandbox
+{
+	class ParticleSystem
+	{
+		struct Particle
+		{
+			public bool IsAlive;
+			public Vector2 Position;
+			public float Rotation;
+			public float Scale;
+			public Vector2 Velocity;
+			public float AngularVelocity;
+			public float LiveTime;
+			public Color Color;
+		}
+
+		private Random _random = new .() ~ delete _;
+
+		private Particle[] _particles ~ delete _;
+		private int _freeParticles;
+
+		public float EmissionRate;
+		public float EmissionAngle;
+		public Vector2 EmissionDirection;
+		public float EmissionVelocity;
+
+		public float EmissionSize;
+		public float EmissionSizeVariance;
+
+		public float LiveTime;
+		public float LiveTimeVariance;
+
+		public Vector2 Position;
+
+		public bool Emit;
+
+		public Color EmmisionColor = .White;
+
+		public this(int maxParticles)
+		{
+			_particles = new Particle[maxParticles];
+			_freeParticles = maxParticles;
+		}
+
+		private float _emission = 0.0f;
+
+		public void Update(GameTime gameTime)
+		{
+			for (var particle in ref _particles)
+			{
+				if (!particle.IsAlive)
+					continue;
+
+				particle.LiveTime -= gameTime.DeltaTime;
+
+				if (particle.LiveTime < 0.0f)
+				{
+					particle.IsAlive = false;
+					_freeParticles++;
+				}
+
+				particle.Position += particle.Velocity * gameTime.DeltaTime;
+				particle.Rotation += particle.AngularVelocity * gameTime.DeltaTime;
+			}
+
+			if (Emit)
+			{
+				_emission += gameTime.DeltaTime * EmissionRate;
+	
+				while (_emission >= 1.0f)
+				{
+					Emit();
+	
+					_emission--;
+				}
+			}
+		}
+
+		public void Draw()
+		{
+			for (let particle in _particles)
+			{
+				if(particle.IsAlive)
+					Renderer2D.DrawQuad(particle.Position, .(particle.Scale), particle.Rotation, particle.Color);
+			}
+		}
+
+		private Particle* GetFreeParticle()
+		{
+			for (ref Particle particle in ref _particles)
+			{
+				if (!particle.IsAlive)
+					return &particle;
+			}
+
+			return null;
+		}
+
+		private void Emit()
+		{
+			if (_freeParticles == 0)
+				return;
+
+			Particle* particle = GetFreeParticle();
+
+			if (particle == null)
+				return;
+
+			particle.IsAlive = true;
+			particle.Position = Position;
+			particle.Rotation = 0;
+			particle.Scale = EmissionSize + (float)_random.NextDoubleSigned() * EmissionSizeVariance;
+
+			float angle = Math.Atan2(EmissionDirection.Y, EmissionDirection.X);
+
+			angle += (float)_random.NextDoubleSigned() * EmissionAngle;
+
+			Vector2 direction = .(Math.Cos(angle), Math.Sin(angle));
+
+			particle.Velocity = direction * EmissionVelocity;
+			particle.AngularVelocity = 0;//EmissionVelocity;
+			particle.LiveTime = LiveTime + (float)_random.NextDoubleSigned() * LiveTimeVariance;
+
+			particle.Color = EmmisionColor;
+
+			_freeParticles--;
+		}
+	}
+}

Sandbox/src/Rocket.bf

@@ -0,0 +1,213 @@
+using GlitchyEngine.Renderer;
+using GlitchyEngine.Math;
+using GlitchyEngine;
+using System;
+using System.Collections;
+
+namespace Sandbox
+{
+	class Rocket
+	{
+		Texture2D _rocketTexture ~ _?.ReleaseRef();
+
+		private Vector2 _gravity = .(0, -9.81f);
+
+		public float Power = 50;
+
+		public float FlightSpeed = 2;
+
+		private Vector2 _acceleration = .(0, 0);
+		private Vector2 _speed;
+
+		private Vector2 _position;
+		private Vector2 _direction;
+
+		private Line2D _rocketLine;
+
+		private float _rotation = -MathHelper.PiOverTwo;
+
+		public bool Dead;
+
+		public bool Started = false;
+
+		public List<Obstacle> Obstacles;
+
+		public int Score = 0;
+
+		public Vector2 Position => _position;
+		public Vector2 Direction => _direction;
+
+		ParticleSystem _particleSystem ~ delete _;
+
+		public this()
+		{
+			_rocketTexture = new Texture2D("content/RocketGame/Rocket.dds");
+			_rocketTexture.SamplerState = SamplerStateManager.PointClamp;
+
+			_particleSystem = new ParticleSystem(1024)
+			{
+				LiveTime = 1.0f,
+				LiveTimeVariance = 0.5f,
+				Emit = true,
+			};
+		}
+
+		public void Update(GameTime gameTime)
+		{
+			do
+			{
+				FlightSpeed = Dead ? 0.0f : 2.0f;
+				
+				if (Dead && Input.IsKeyPressing(Key.Space))
+				{
+					Dead = false;
+					Started = false;
+					_speed = .Zero;
+					Score = 0;
+				}
+				else if (!Started)
+				{
+					_position = .Zero;
+					
+					if (Input.IsKeyPressing(Key.Space))
+						Started = true;
+					else
+						break;
+				}
+	
+				UpdatePosition(gameTime);
+	
+				if (Started)
+					CheckDead();
+			}
+			
+			UpdateParticles(gameTime);
+		}
+
+		private void UpdateParticles(GameTime gameTime)
+		{
+			
+			_particleSystem.Position = Position - Direction * 0.4f;
+			_particleSystem.EmissionDirection = -Direction;
+			_particleSystem.EmissionVelocity = FlightSpeed * 2;
+			_particleSystem.EmissionAngle = MathHelper.PiOverFour / 2;
+
+			_particleSystem.Emit = !Dead;
+
+			if (Input.IsKeyPressing(Key.Space))
+			{
+				_particleSystem.EmissionRate = 100;
+				_particleSystem.EmissionSize = 0.125f;
+				_particleSystem.EmissionSizeVariance = 0.025f;
+
+				_particleSystem.EmmisionColor = .(255, 106, 0);
+			}
+			else if (Input.IsKeyReleasing(Key.Space))
+			{
+				_particleSystem.EmissionRate = 10;
+				_particleSystem.EmissionSize = 0.075f;
+				_particleSystem.EmissionSizeVariance = 0.025f;
+
+				_particleSystem.EmmisionColor = .(140, 126, 93);
+			}
+
+			_particleSystem.Update(gameTime);
+
+		}
+
+		public void Draw()
+		{
+			_particleSystem.Draw();
+
+			Renderer2D.DrawQuad(Vector3(_position, 5), .One, _rotation, _rocketTexture, .White);
+		}
+
+		private void UpdatePosition(GameTime gameTime)
+		{
+			_acceleration.Y = 0;
+
+			if (!Dead && Input.IsKeyPressed(Key.Space))
+			{
+				_acceleration.Y += Power;
+			}
+
+			Vector2 newSpeed = _speed + (_acceleration + _gravity) * gameTime.DeltaTime;
+
+			Vector2 newPosition = _position + newSpeed * gameTime.DeltaTime;
+
+			_speed = newSpeed;
+			_position = newPosition;
+			
+			float ang = Math.Atan2(_speed.Y, 5) - MathHelper.PiOverTwo;
+
+			_rotation = ang;
+
+			_direction = Vector2.Normalize(_speed + .(5, 0));
+			_rocketLine = .(_position - _direction / 2.8f, _position + _direction / 2.4f);
+		}
+
+		const float worldBorder = 2.1f;
+
+		private void CheckDead()
+		{
+			if (Math.Abs(_position.Y) >= worldBorder)
+			{
+				Dead = true;
+				_speed.Y *= -0.8f;
+				_position.Y = Math.Clamp(_position.Y, -worldBorder, worldBorder);
+			}
+
+			CheckObstacles();
+		}
+
+		private int scoreLine = -1;
+
+		private void CheckObstacles()
+		{
+			for (Obstacle obs in Obstacles)
+			{
+				//const float f = Vector2.One.Magnitude();
+				float f = Vector2.One.Magnitude();
+
+				Vector2 center = obs.Position;
+				
+				Vector2 topCenter = center + .(0, obs.HoleSize);
+				Vector2 topTip = topCenter - .(0, 2.5f * f);
+				Vector2 topRight = topCenter - .(f, 0);
+				Vector2 topLeft = topCenter + .(f, 0);
+				
+				Vector2 bottomCenter = center - .(0, obs.HoleSize);
+				Vector2 bottomTip = bottomCenter + .(0, 2.5f * f);
+				Vector2 bottomRight = bottomCenter - .(f, 0);
+				Vector2 bottomLeft = bottomCenter + .(f, 0);
+
+				Line2D bottomR = .(bottomTip, bottomRight);
+				Line2D bottomL = .(bottomTip, bottomLeft);
+
+				Line2D topR = .(topTip, topRight);
+				Line2D topL = .(topTip, topLeft);
+
+				if ((bottomR.Intersects(_rocketLine) case .Intersection) ||
+					(bottomL.Intersects(_rocketLine) case .Intersection) ||
+					(topR.Intersects(_rocketLine) case .Intersection) ||
+					(topL.Intersects(_rocketLine) case .Intersection))
+				{
+					Dead = true;
+				}
+
+				if (!Dead)
+				{
+					if (Line2D(bottomTip, topTip).Intersects(_rocketLine) case .Intersection)
+					{
+						scoreLine = @obs.Index;
+					}
+					else if (scoreLine == @obs.Index)
+					{
+						Score++;
+						scoreLine = -1;
+					}
+				}
+			}
+		}
+	}
+}

Sandbox/src/SandboxApp.bf

@@ -18,13 +18,17 @@ namespace Sandbox
 	{
 		public this()
 		{
-#if GAMMA_TEST
+			Window.Title = "Single Stage to Highscore";
+			Window.SetIcon("content/RocketGame/RocketIcon.ico");
+
+/*#if GAMMA_TEST
 			PushLayer(new GammaTestLayer());
 #elif SANDBOX_2D
 			PushLayer(new ExampleLayer2D());
 #else
 			PushLayer(new ExampleLayer());
-#endif
+#endif*/
+			PushLayer(new GameLayer());
 		}
 
 		[Export, LinkName("CreateApplication")]