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Finalize ParticleSystem, add angular velocity, multiple emitters, GetBool for IDataReader, use Lerp in LerpColor.

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This commit is contained in:
dnesov
2024-10-17 00:50:49 +02:00
parent 7c7c61fd56
commit 775b973eb2
7 changed files with 139 additions and 109 deletions
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20
TestGame/Resources/fire_effect.toml Normal file
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@@ -0,0 +1,20 @@
# Fire effect example
[ParticleEmitterSettings]
Local = true
MaxParticles = 128
EmitRadius = 8
Explosiveness = 0
LifeTime = 1.0
Direction = [0.0, -1.0]
LinearVelocity = 200
LinearVelocityDamping = 0.0
AngularVelocity = 230
AngularVelocityDamping = 0.0
AngularVelocityRandom = 1.0
Gravity = [0.0, 0.0]
LinearVelocityRandom = 0.5
ScaleBegin = 0.1
ScaleEnd = 5.0
ColorBegin = [255, 162, 0]
ColorEnd = [64, 64, 64, 0]

14
TestGame/Resources/test_emitter.toml
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@@ -1,14 +0,0 @@
[ParticleEmitterSettings]
MaxParticles = 1024
EmitRadius = 128
Explosiveness = 1.0
LifeTime = 2.0
Direction = [0.0, -1.0]
LinearVelocity = 200
Gravity = [0.0, 0.0]
LinearVelocityRandom = 0.5
ScaleBegin = 1.0
ScaleEnd = 5.0
ColorBegin = [255, 0, 0, 0]
ColorEnd = [0, 255, 0, 255]

31
TestGame/TestGame.cs
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@@ -26,11 +26,6 @@ public class TestGame : Game
protected override void LoadResources()
{
// if (!ResourceManager.TryLoad("my_sound", "sounds/test_sound.ogg", out Sound? _testSound))
// {
// }
if (!ResourceManager.TryLoad("fonts/Inter-Regular.ttf", out _font))
{
@@ -38,7 +33,7 @@ public class TestGame : Game
ResourceManager.TryLoad("icon.png", out _icon);
if (!ResourceManager.TryLoad("test_emitter.toml", out _emitterSettings))
if (!ResourceManager.TryLoad("fire_effect.toml", out _fireEffect))
{
throw new Exception("Failed to load emitter settings!");
}
@@ -46,7 +41,7 @@ public class TestGame : Game
protected override void Ready()
{
_emitterId = _particleSystem.CreateEmitter(Renderer.WindowSize / 2, _emitterSettings);
_emitterId = _particleSystem.CreateEmitter(Renderer.WindowSize / 2, _fireEffect);
}
protected override void Run()
@@ -59,6 +54,16 @@ public class TestGame : Game
_particleSystem!.RestartEmitter(_emitterId);
}
if (Input.KeyboardKeyJustPressed(KeyboardKey.One))
{
_particleSystem.CreateEmitter(Input.GetMousePosition(), _fireEffect);
}
if (Input.IsMouseButtonDown(MouseButton.Left))
{
_particleSystem.SetEmitterPosition(_emitterId, Input.GetMousePosition());
}
_particleSimStopwatch = Stopwatch.StartNew();
_particleSystem!.Update(Renderer.FrameTime);
_particleSimStopwatch.Stop();
@@ -97,15 +102,15 @@ public class TestGame : Game
Renderer.BeginBlended(Voile.Rendering.BlendMode.BlendAlpha);
var maxParticles = emitter.Settings.MaxParticles;
var particleSize = new Vector2(16.0f, 16.0f);
var pivot = particleSize / 2;
for (int i = maxParticles - 1; i > 0; i--)
for (int i = maxParticles - 1; i >= 0; i--)
{
var particle = emitter.GetParticle(i);
var color = new Color(particle.ColorArgb);
Renderer.SetTransform(emitter.OriginPosition + particle.Position, Vector2.Zero);
Renderer.DrawRectangle(Vector2.One * 16.0f * particle.Scale, color);
Renderer.SetTransform(particle.Position, pivot, particle.Rotation);
Renderer.DrawRectangle(particleSize * particle.Scale, particle.Color);
}
Renderer.EndBlended();
@@ -116,7 +121,7 @@ public class TestGame : Game
private Stopwatch _particleSimStopwatch, _renderStopwatch;
private long _lastRenderTime;
private int _emitterId;
private ResourceRef<ParticleEmitterSettingsResource> _emitterSettings;
private ResourceRef<ParticleEmitterSettingsResource> _fireEffect;
private ResourceRef<Font> _font;
private ResourceRef<Texture2d> _icon;
private Logger _logger = new(nameof(TestGame));

7
Voile/Source/Resources/DataReaders/IDataReader.cs
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@@ -30,6 +30,13 @@ namespace Voile.Resources.DataReaders
/// </summary>
public interface IStreamKeyValueGetter
{
/// <summary>
/// Get a boolean from this data getter.
/// </summary>
/// <param name="key">Key of the value.</param>
/// <param name="defaultValue">Default value in case this getter fails to get data.</param>
/// <returns></returns>
bool GetBool(string key, bool defaultValue = false);
/// <summary>
/// Get an int from this data getter.
/// </summary>

24
Voile/Source/Resources/DataReaders/TomlDataReader.cs
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@@ -31,6 +31,30 @@ public class TomlDataReader : IStreamDataReader, IDataValidator, IStreamKeyValue
}
}
public bool GetBool(string key, bool defaultValue = false)
{
if (_table is null)
{
return defaultValue;
}
var dataTable = _table[ExpectedHeader];
if (!dataTable.HasKey(key))
{
return defaultValue;
}
var tableValue = dataTable[key];
if (!tableValue.IsBoolean)
{
return defaultValue;
}
return tableValue.AsBoolean;
}
public int GetInt(string key, int defaultValue = 0)
{
if (_table is null)

144
Voile/Source/Systems/ParticleSystem.cs
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@@ -12,7 +12,7 @@ public struct Particle
}
public int EmitterIndex { get; set; }
public int ColorArgb { get; set; }
public Color Color { get; set; }
public Vector2 Position { get; set; }
public float LifeTime { get; set; } = 1.0f;
public float Scale { get; set; }
@@ -21,6 +21,7 @@ public struct Particle
public class ParticleEmitterSettings
{
public bool Local { get; set; } = true;
public int MaxParticles { get; set; } = 16;
public float EmitRadius { get; set; }
public float LifeTime { get; set; } = 1.0f;
@@ -28,14 +29,15 @@ public class ParticleEmitterSettings
public Vector2 Direction { get; set; } = -Vector2.UnitY;
public float LinearVelocity { get; set; } = 980.0f;
public float AngularVelocity { get; set; }
public float AngularVelocityRandom { get; set; }
public float AngularVelocityRandom { get; set; } = 0.5f;
public float LinearVelocityRandom { get; set; } = 0.5f;
public Vector2 Gravity { get; set; } = Vector2.UnitY * 980f;
public float ScaleBegin { get; set; } = 1.0f;
public float ScaleEnd { get; set; } = 0.0f;
public Color ColorBegin { get; set; } = Color.White;
public Color ColorEnd { get; set; } = Color.Black;
public float Damping { get; set; } = 1.0f;
public float LinearVelocityDamping { get; set; } = 1.0f;
public float AngularVelocityDamping { get; set; } = 0.1f;
}
public class ParticleEmitterSettingsResource : Resource
@@ -45,7 +47,6 @@ public class ParticleEmitterSettingsResource : Resource
{
Settings = settings;
}
}
/// <summary>
@@ -65,6 +66,7 @@ public class ParticleEmitterSettingsResourceLoader : ResourceLoader<ParticleEmit
{
reader.Read(File.Open(path, FileMode.Open));
settings.Local = reader.GetBool("Local", true);
settings.MaxParticles = reader.GetInt("MaxParticles");
settings.EmitRadius = reader.GetInt("EmitRadius");
settings.LifeTime = reader.GetFloat("LifeTime", 1.0f);
@@ -79,7 +81,8 @@ public class ParticleEmitterSettingsResourceLoader : ResourceLoader<ParticleEmit
settings.ScaleEnd = reader.GetFloat("ScaleEnd");
settings.ColorBegin = reader.GetColor("ColorBegin", Color.White);
settings.ColorEnd = reader.GetColor("ColorEnd", Color.Black);
settings.Damping = reader.GetFloat("Damping", 1.0f);
settings.LinearVelocityDamping = reader.GetFloat("LinearVelocityDamping", 1.0f);
settings.AngularVelocityDamping = reader.GetFloat("AngularVelocityDamping", 1.0f);
}
return new ParticleEmitterSettingsResource(path, settings);
@@ -94,12 +97,11 @@ public class ParticleEmitter : IUpdatableSystem
/// <summary>
/// Origin position in the world of this emitter.
/// </summary>
public Vector2 OriginPosition => _originPosition;
public Vector2 OriginPosition { get; set; }
/// <summary>
/// <see cref="ParticleEmitterSettings"/> for this emitter.
/// </summary>
public ParticleEmitterSettings Settings => _settingsResource.Value.Settings;
public int ArrayOffset => _lifetimes.Offset;
/// <summary>
/// Constructs a new <see cref="ParticleEmitter"/>.
@@ -107,29 +109,39 @@ public class ParticleEmitter : IUpdatableSystem
/// <param name="originPosition">World origin position.</param>
/// <param name="settingsResource">Emitter settings resource.</param>
/// <param name="particles">Particle segment that this emitter will simulate.</param>
public ParticleEmitter(Vector2 originPosition, ResourceRef<ParticleEmitterSettingsResource> settingsResource, ArraySegment<Vector2> positionsSlice, ArraySegment<Vector2> velocitiesSlice, ArraySegment<float> lifetimesSlice)
public ParticleEmitter(Vector2 originPosition, ResourceRef<ParticleEmitterSettingsResource> settingsResource)
{
_originPosition = originPosition;
OriginPosition = originPosition;
_settingsResource = settingsResource;
_maxParticles = _settingsResource.Value.Settings.MaxParticles;
// _particleIndex = _maxParticles - 1;
_positions = positionsSlice;
_velocities = velocitiesSlice;
_lifetimes = lifetimesSlice;
_positions = new Vector2[_maxParticles];
_velocities = new Vector2[_maxParticles];
_angularVelocities = new float[_maxParticles];
_lifetimes = new float[_maxParticles];
_rotations = new float[_maxParticles];
_random = new LehmerRandom();
}
public Particle GetParticle(int idx)
{
if (idx > _lifetimes.Length)
{
return new Particle();
}
var t = _lifetimes[idx] / Settings.LifeTime;
var scale = MathUtils.Lerp(Settings.ScaleEnd, Settings.ScaleBegin, t);
var color = MathUtils.LerpColor(Settings.ColorEnd, Settings.ColorBegin, t);
return new Particle()
{
Position = _positions[idx],
Scale = MathUtils.Lerp(Settings.ScaleEnd, Settings.ScaleBegin, t),
ColorArgb = MathUtils.LerpColor(Settings.ColorEnd, Settings.ColorBegin, t).Argb
Scale = scale,
Color = color,
Rotation = _rotations[idx]
};
}
@@ -139,12 +151,14 @@ public class ParticleEmitter : IUpdatableSystem
/// <param name="particles">New particle segment.</param>
public void Restart()
{
for (int i = 0; i < _lifetimes.Count; i++)
{
_lifetimes[i] = 0.0f;
}
_maxParticles = Settings.MaxParticles;
_positions = new Vector2[_maxParticles];
_velocities = new Vector2[_maxParticles];
_angularVelocities = new float[_maxParticles];
_lifetimes = new float[_maxParticles];
_rotations = new float[_maxParticles];
_particleIndex = 0;
}
@@ -156,23 +170,28 @@ public class ParticleEmitter : IUpdatableSystem
{
var rate = (int)MathUtils.Lerp(1, _maxParticles, Settings.Explosiveness);
for (int i = 0; i < rate; i++)
{
Emit();
}
var deltaTimeVector = new Vector2((float)deltaTime);
var gravityVector = Settings.Gravity * (float)deltaTime;
var dampingFactor = Settings.Damping * (float)deltaTime;
var linearVelocityDampingFactor = Settings.LinearVelocityDamping * (float)deltaTime;
var angularVelocityDampingFactor = Settings.AngularVelocityDamping * (float)deltaTime;
for (int i = 0; i < _maxParticles; i++)
{
_lifetimes[i] = Math.Max(0.0f, _lifetimes[i] - (float)deltaTime);
_velocities[i] += gravityVector;
_positions[i] += _velocities[i] * deltaTimeVector;
_velocities[i] -= _velocities[i] * dampingFactor;
_positions[i] += _velocities[i] * deltaTimeVector;
_rotations[i] += _angularVelocities[i] * (float)deltaTime;
_velocities[i] -= _velocities[i] * linearVelocityDampingFactor;
_angularVelocities[i] -= _angularVelocities[i] * angularVelocityDampingFactor;
}
for (int i = 0; i < rate; i++)
{
Emit();
}
}
@@ -184,6 +203,7 @@ public class ParticleEmitter : IUpdatableSystem
_velocities[_particleIndex] = Settings.Direction * Settings.LinearVelocity;
_velocities[_particleIndex] += Vector2.One * Settings.LinearVelocityRandom * ((float)_random.NextDouble() - 0.5f);
_angularVelocities[_particleIndex] = Settings.AngularVelocity * Settings.AngularVelocityRandom * ((float)_random.NextDouble() - 0.5f);
_lifetimes[_particleIndex] = Settings.LifeTime;
@@ -193,6 +213,7 @@ public class ParticleEmitter : IUpdatableSystem
private Vector2 GetEmitPosition()
{
var settings = _settingsResource.Value.Settings;
Vector2 originOffset = Settings.Local ? OriginPosition : Vector2.Zero;
// https://gamedev.stackexchange.com/questions/26713/calculate-random-points-pixel-within-a-circle-image
var angle = _random.NextDouble() * Math.PI * 2;
@@ -201,15 +222,16 @@ public class ParticleEmitter : IUpdatableSystem
float x = radius * (float)Math.Cos(angle);
float y = radius * (float)Math.Sin(angle);
return new Vector2(x, y);
var point = new Vector2(x, y);
return point + originOffset;
}
private LehmerRandom _random;
private int _maxParticles;
private int _particleIndex;
private Vector2 _originPosition = Vector2.Zero;
private ArraySegment<Vector2> _positions, _velocities;
private ArraySegment<float> _lifetimes;
private Vector2[] _positions, _velocities;
private float[] _lifetimes, _rotations, _angularVelocities;
private ResourceRef<ParticleEmitterSettingsResource> _settingsResource;
}
@@ -218,26 +240,11 @@ public class ParticleEmitter : IUpdatableSystem
/// </summary>
public class ParticleSystem : IUpdatableSystem, IDisposable
{
/// <summary>
/// Maximum amount of particles emittable by the system.
/// </summary>
public int ParticleLimit { get; set; } = short.MaxValue;
/// <summary>
/// List of particle emitters created for this ParticleSystem.
/// </summary>
public IReadOnlyList<ParticleEmitter> Emitters => _emitters;
/// <summary>
/// Constructs a new <see cref="ParticleSystem"/>.
/// </summary>
public ParticleSystem()
{
_particlePositions = new Vector2[ParticleLimit];
_particleVelocities = new Vector2[ParticleLimit];
_particleLifetimes = new float[ParticleLimit];
}
/// <summary>
/// Creates an emitter from a <see cref="ParticleEmitterSettingsResource"/>.
/// </summary>
@@ -246,31 +253,22 @@ public class ParticleSystem : IUpdatableSystem, IDisposable
/// <returns></returns>
public int CreateEmitter(Vector2 originPosition, ResourceRef<ParticleEmitterSettingsResource> settingsResource)
{
var settings = settingsResource.Value.Settings;
if (_emitterSliceOffset + settings.MaxParticles >= ParticleLimit - 1)
{
_logger.Error("Cannot create an emitter! Reached particle limit.");
return -1;
}
var positionsSlice = new ArraySegment<Vector2>(_particlePositions, _emitterSliceOffset, settings.MaxParticles);
var velocitiesSlice = new ArraySegment<Vector2>(_particleVelocities, _emitterSliceOffset, settings.MaxParticles);
var lifetimesSlice = new ArraySegment<float>(_particleLifetimes, _emitterSliceOffset, settings.MaxParticles);
for (int i = 0; i < lifetimesSlice.Count; i++)
{
lifetimesSlice[i] = settings.LifeTime;
}
var emitter = new ParticleEmitter(originPosition, settingsResource, positionsSlice, velocitiesSlice, lifetimesSlice);
var emitter = new ParticleEmitter(originPosition, settingsResource);
_emitters.Add(emitter);
_emitterSliceOffset += settings.MaxParticles;
return _emitters.Count - 1;
}
public void SetEmitterPosition(int emitterIdx, Vector2 position)
{
if (emitterIdx >= _emitters.Count)
{
throw new ArgumentException($"Emitter with idx {emitterIdx} is not present!");
}
var emitter = _emitters[emitterIdx];
emitter.OriginPosition = position;
}
/// <summary>
/// Restarts an emitter.
/// </summary>
@@ -284,7 +282,6 @@ public class ParticleSystem : IUpdatableSystem, IDisposable
}
var emitter = _emitters[id];
emitter.Restart();
}
@@ -302,16 +299,7 @@ public class ParticleSystem : IUpdatableSystem, IDisposable
public void Dispose()
{
Array.Clear(_particlePositions);
Array.Clear(_particleVelocities);
Array.Clear(_particleLifetimes);
}
private Vector2[] _particlePositions, _particleVelocities;
private float[] _particleLifetimes;
private int _emitterSliceOffset;
private List<ParticleEmitter> _emitters = new();
private Logger _logger = new(nameof(ParticleSystem));
}

8
Voile/Source/Utils/MathUtils.cs
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@@ -19,10 +19,10 @@ namespace Voile
{
t = Math.Clamp(t, 0f, 1f);
byte r = (byte)(colorA.R + (colorB.R - colorA.R) * t);
byte g = (byte)(colorA.G + (colorB.G - colorA.G) * t);
byte b = (byte)(colorA.B + (colorB.B - colorA.B) * t);
byte a = (byte)(colorA.A + (colorB.A - colorA.A) * t);
byte r = (byte)Lerp(colorA.R, colorB.R, t);
byte g = (byte)Lerp(colorA.G, colorB.G, t);
byte b = (byte)Lerp(colorA.B, colorB.B, t);
byte a = (byte)Lerp(colorA.A, colorB.A, t);
return new Color(r, g, b, a);
}