private void Init(ParticleSystemSettings Settings, ContentManager Content, GraphicsDevice GraphicsDevice)
{
this.Settings = Settings;
UseAlphaBlend = false;
// Allocate the particle array, and fill in the corner fields (which never change).
ArrayParticles = new ParticleVertex[Settings.MaxParticles * 4];
for (int i = 0; i < Settings.MaxParticles; i++)
{
ArrayParticles[i * 4 + 0].UV = new Vector2(0, 0);
ArrayParticles[i * 4 + 1].UV = new Vector2(1, 0);
ArrayParticles[i * 4 + 2].UV = new Vector2(1, 1);
ArrayParticles[i * 4 + 3].UV = new Vector2(0, 1);
}
Effect effect = Content.Load <Effect>("Shaders/Particle shader 3D");
// If we have several particle systems, the content manager will return
// a single shared effect instance to them all. But we want to preconfigure
// the effect with parameters that are specific to this particular
// particle system. By cloning the effect, we prevent one particle system
// from stomping over the parameter settings of another.
ParticleEffect = effect.Clone();
Parameters = ParticleEffect.Parameters;
// Look up shortcuts for parameters that change every frame.
EffectViewParameter = Parameters["View"];
EffectProjectionParameter = Parameters["Projection"];
EffectViewportScaleParameter = Parameters["ViewportScale"];
EffectTimeParameter = Parameters["CurrentTime"];
// Set the values of parameters that do not change.
Parameters["NumberOfImages"].SetValue(Settings.NumberOfImages);
Parameters["RotateTowardCamera"].SetValue(Settings.RotateTowardCamera ? 1f : 0);
// Load the particle texture, and set it onto the effect.
Texture2D sprBackground = Content.Load <Texture2D>(Settings.TextureName);
this.ParticleSize = new Vector2((sprBackground.Width / Settings.NumberOfImages) * 0.5f, sprBackground.Height * 0.5f);
Parameters["Size"].SetValue(ParticleSize);
Parameters["t0"].SetValue(sprBackground);
// Create a dynamic vertex buffer.
VertexBuffer = new DynamicVertexBuffer(GraphicsDevice, ParticleVertex.VertexDeclaration,
Settings.MaxParticles * 4, BufferUsage.WriteOnly);
// Create and populate the index buffer.
ushort[] ArrayIndex = new ushort[Settings.MaxParticles * 6];
for (int i = 0; i < Settings.MaxParticles; i++)
{
ArrayIndex[i * 6 + 0] = (ushort)(i * 4 + 0);
ArrayIndex[i * 6 + 1] = (ushort)(i * 4 + 1);
ArrayIndex[i * 6 + 2] = (ushort)(i * 4 + 2);
ArrayIndex[i * 6 + 3] = (ushort)(i * 4 + 0);
ArrayIndex[i * 6 + 4] = (ushort)(i * 4 + 2);
ArrayIndex[i * 6 + 5] = (ushort)(i * 4 + 3);
}
IndexBuffer = new IndexBuffer(GraphicsDevice, typeof(ushort), ArrayIndex.Length, BufferUsage.WriteOnly);
IndexBuffer.SetData(ArrayIndex);
}
public ParticleSystem(string TextureName, int MaxParticles, int NumberOfImages, BlendState BlendState, bool RotateTowardCamera, ContentManager Content, GraphicsDevice GraphicsDevice)
{
ParticleSystemSettings NewParticleSystemSettings = new ParticleSystemSettings(TextureName, MaxParticles, NumberOfImages, BlendState, RotateTowardCamera);
Init(NewParticleSystemSettings, Content, GraphicsDevice);
}
