private float partial = 0.0f; // Number of particles that need to be emitted.
public override void Update()
{
if (active)
{
// Emit new particles if needed.
float dt = Time.GameTimeFrameSeconds;
dt = MathHelper.Clamp(dt, 0.0f, 1.0f); // Limit to reasonable values.
partial += dt * emissionRate;
// Note this is set up so that at most a single particle will be
// emitted per Update call. This works for the glow but may
// not be right for other particle effects.
if (partial >= 1.0f)
{
GlowParticle particle = NewParticle(color);
particleList.Add(particle);
partial -= 1.0f;
}
// Update any existing particles. For more heavyweight particles we could
// have an Update call per particle. These are lightweight enough that we
// can just update them directly.
for (int i = 0; i < particleList.Count;)
{
GlowParticle particle = (GlowParticle)particleList[i];
particle.age += dt;
Debug.Assert(particle.age >= 0.0f);
float t = particle.age / lifetime;
if (t > 1.0f)
{
// Dead particle.
ReleaseParticle(i);
}
else
{
particle.radius = MyMath.Lerp(startRadius, endRadius, t) * scale;
particle.alpha = MyMath.Lerp(startAlpha, endAlpha, t);
particle.alpha *= particle.alpha;
i++;
}
}
} // end of if active
} // end of GlowEmitter Update()
} // end of Emitter Render()
private GlowParticle NewParticle(Vector4 color)
{
GlowParticle part = null;
if (unused.Count > 0)
{
part = unused[unused.Count - 1];
unused.RemoveAt(unused.Count - 1);
}
else
{
part = new GlowParticle();
}
part.color = color;
part.age = 0.0f;
return(part);
}
public override void ModifyLight(int i, int j, ref float r, ref float g, ref float b)
{
Tile tile = Framing.GetTileSafely(i, j);
b = 0.3f;
r = g = (float)Math.Sin(Main.GlobalTime) * 0.2f + 0.8f;
if (tile.frameY > 54 || Main.dayTime)
{
return;
}
if (Main.rand.NextBool(180))
{
GlowParticle particle = new GlowParticle(
new Vector2(i, j).ToWorldCoordinates() + new Vector2(40f * (Main.rand.NextBool() ? 1 : -1), 30f * (Main.rand.NextBool() ? 1 : -1)),
Main.rand.NextVector2Unit() * Main.rand.NextFloat(0.1f, 0.4f),
new Color(0.7f, 0.7f, 0.15f),
Main.rand.NextFloat(1f, 2f),
Main.rand.Next(180, 400));
ParticleHandler.SpawnParticle(particle);
}
}
} // end of GlowEmitter Update()
public override void Render(Camera camera)
{
if (active)
{
GraphicsDevice device = BokuGame.bokuGame.GraphicsDevice;
Sphere sphere = Sphere.GetInstance();
// Get the effect we need.
Effect effect = manager.Effect3d;
// Set up common rendering values.
effect.CurrentTechnique = manager.Technique(ParticleSystemManager.EffectTech3d.PremultAlphaGlowColorPass);
// Set up world matrix.
Matrix worldMatrix = Matrix.Identity;
worldMatrix.Translation = position;
device.Indices = sphere.Ibuf;
device.SetVertexBuffer(sphere.Vbuf);
if (showSolidCore)
{
Matrix worldViewProjMatrix = worldMatrix * camera.ViewProjectionMatrix;
// Set radius.
manager.Parameter(ParticleSystemManager.EffectParams3d.Radius).SetValue(startRadius * scale);
manager.Parameter(ParticleSystemManager.EffectParams3d.WorldMatrix).SetValue(worldMatrix);
manager.Parameter(ParticleSystemManager.EffectParams3d.WorldViewProjMatrix).SetValue(worldViewProjMatrix);
// Set alpha.
manager.Parameter(ParticleSystemManager.EffectParams3d.Alpha).SetValue(1.0f);
// Set color.
manager.Parameter(ParticleSystemManager.EffectParams3d.DiffuseColor).SetValue(color);
manager.Parameter(ParticleSystemManager.EffectParams3d.EmissiveColor).SetValue(Vector4.Zero);
// Set glow factor.
manager.Parameter(ParticleSystemManager.EffectParams3d.GlowFactor).SetValue(0.1f);
effect.CurrentTechnique.Passes[0].Apply();
sphere.DrawPrim(effect);
}
// Set glow factor for shells.
manager.Parameter(ParticleSystemManager.EffectParams3d.GlowFactor).SetValue(1.5f);
for (int i = 0; i < particleList.Count; i++)
{
GlowParticle particle = (GlowParticle)particleList[i];
Matrix worldViewProjMatrix = worldMatrix * camera.ViewProjectionMatrix;
// Set radius.
manager.Parameter(ParticleSystemManager.EffectParams3d.Radius).SetValue(particle.radius);
manager.Parameter(ParticleSystemManager.EffectParams3d.WorldMatrix).SetValue(worldMatrix);
manager.Parameter(ParticleSystemManager.EffectParams3d.WorldViewProjMatrix).SetValue(worldViewProjMatrix);
// Set alpha.
manager.Parameter(ParticleSystemManager.EffectParams3d.Alpha).SetValue(particle.alpha);
// Set color
manager.Parameter(ParticleSystemManager.EffectParams3d.DiffuseColor).SetValue(particle.color);
manager.Parameter(ParticleSystemManager.EffectParams3d.EmissiveColor).SetValue(Vector4.Zero);
effect.CurrentTechnique.Passes[0].Apply();
sphere.DrawPrim(effect);
}
} // end of if active
} // end of Emitter Render()
