Wizardry/src/main/java/electroblob/wizardry/client/particle/ParticleWizardry.java

package electroblob.wizardry.client.particle;

import electroblob.wizardry.Wizardry;
import electroblob.wizardry.client.ClientProxy;
import electroblob.wizardry.entity.ICustomHitbox;
import electroblob.wizardry.util.EntityUtils;
import net.minecraft.client.Minecraft;
import net.minecraft.client.particle.Particle;
import net.minecraft.client.renderer.BufferBuilder;
import net.minecraft.client.renderer.texture.TextureAtlasSprite;
import net.minecraft.entity.Entity;
import net.minecraft.util.ResourceLocation;
import net.minecraft.util.math.AxisAlignedBB;
import net.minecraft.util.math.MathHelper;
import net.minecraft.util.math.Vec3d;
import net.minecraft.world.World;
import net.minecraftforge.client.event.TextureStitchEvent;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

import javax.annotation.Nullable;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import java.util.stream.Collectors;

/**
 * Abstract superclass for all of wizardry's particles. This replaces {@code ParticleCustomTexture} (the functionality of
 * which is no longer necessary since wizardry now uses {@code TextureAtlasSprite}s to do the rendering), and fits into
 * {@code ParticleBuilder} by exposing all the necessary variables through setters, allowing them to be set on the fly
 * rather than needing to be passed into the  constructor.
 * <p></p>
 * The new system is as follows:
 * <p></p>
 * - All particle classes have a single constructor which takes a world and a position only.<br>
 * - Each particle class defines any relevant default values in its constructor, including velocity.<br>
 * - The particle builder then overwrites any other values that were set during building.
 * <p></p>
 * This beauty of this system is that there are never any redundant parameters when spawning particles, since you can set
 * as many or as few parameters as necessary - and in addition, common defaults don't need setting at all. For example,
 * snow particles nearly always fall at the same speed, which can now be defined in the particle class and no longer
 * needs to be defined when spawning the particle - but importantly, it can still be overridden if desired.
 * 
 * @author Electroblob
 * @since Wizardry 4.2.0 
 * @see electroblob.wizardry.util.ParticleBuilder ParticleBuilder
 */
//@SideOnly(Side.CLIENT)
public abstract class ParticleWizardry extends Particle {

	/** Implementation of animated particles using the TextureAtlasSprite system. Why vanilla doesn't support this I
	 * don't know, considering it too has animated particles. */
	protected final TextureAtlasSprite[] sprites;

	/** A long value used by the renderer as a random number seed, ensuring anything that is randomised remains the
	 * same across multiple frames. For example, lightning particles use this to keep their shape across ticks.
	 * This value can also be set during particle creation, allowing users to keep randomised properties the same
	 * even across multiple particles. If unspecified, the seed is chosen at random. */
	protected long seed;
	/** This particle's random number generator. All particles should use this in preference to any other random
	 * instance (like random), even if it isn't actually necessary to keep properties across frames. Note that
	 * if you <b>do</b> need to generate the same sequence of random numbers each frame, you must call
	 * {@code random.setSeed(seed)} from the {@link ParticleWizardry#renderParticle(BufferBuilder, Entity, float, float, float, float, float, float)}
	 * method - this is not done automatically. */
	protected Random random = new Random(); // If we're not using a seed, this defaults to any old seed
	
	/** True if the particle is shaded, false if the particle always renders at full brightness. Defaults to false. */
	protected boolean shaded = false;

	protected float initialRed;
	protected float initialGreen;
	protected float initialBlue;
	
	protected float fadeRed = 0;
	protected float fadeGreen = 0;
	protected float fadeBlue = 0;
	
	protected float angle;
	protected double radius = 0;
	protected double speed = 0;
	
	/** The entity this particle is linked to. The particle will move with this entity. */
	@Nullable
	protected Entity entity = null;
	/** Coordinates of this particle relative to the linked entity. If the linked entity is null, these are used as
	 * the absolute coordinates of the centre of rotation for particles with spin. If the particle has neither a
	 * linked entity nor spin, these are not used. */
	protected double relativeX, relativeY, relativeZ;
	/** Velocity of this particle relative to the linked entity. If the linked entity is null, these are not used. */
	protected double relativeMotionX, relativeMotionY, relativeMotionZ;
	// Note that roll (equivalent to rotating the texture) is effectively handled by particleAngle - although that is
	// actually the rotation speed and not the angle itself.
	/** The yaw angle this particle is facing, or {@code NaN} if this particle always faces the viewer (default behaviour). */
	protected float yaw = Float.NaN;
	/** The pitch angle this particle is facing, or {@code NaN} if this particle always faces the viewer (default behaviour). */
	protected float pitch = Float.NaN;

	/** The fraction of the impact velocity that should be the maximum spread speed added on impact. */
	private static final double SPREAD_FACTOR = 0.2;
	/** Lateral velocity is reduced by this factor on impact, before adding random spread velocity. */
	private static final double IMPACT_FRICTION = 0.2;

	/** Previous-tick velocity, used in collision detection. */
	private double prevVelX, prevVelY, prevVelZ;

	/**
	 * Creates a new particle in the given world at the given position. All other parameters are set via the various
	 * setter methods ({@link electroblob.wizardry.util.ParticleBuilder ParticleBuilder} deals with all of that anyway). 
	 * @param world The world in which to create the particle.
	 * @param x The x-coordinate at which to create the particle.
	 * @param y The y-coordinate at which to create the particle.
	 * @param z The z-coordinate at which to create the particle.
	 * @param textures One or more {@code ResourceLocation}s representing the texture(s) used by this particle. These
	 * <b>must</b> be registered as {@link TextureAtlasSprite}s using {@link TextureStitchEvent} or the textures will be
	 * missing. If more than one {@code ResourceLocation} is specified, the particle will be animated with each texture
	 * shown in order for an equal proportion of the particle's lifetime. If this argument is omitted (or a zero-length
	 * array is given), the particle will use the vanilla system instead (based on the X/Y texture indices).
	 */
	public ParticleWizardry(World world, double x, double y, double z, ResourceLocation... textures){
		
		super(world, x, y, z);
		
		// Sets the relative coordinates in case they are needed
		this.relativeX = x;
		this.relativeY = y;
		this.relativeZ = z;
		
		// Deals with the textures
		if(textures.length > 0){
			
			sprites = Arrays.stream(textures).map(t -> Minecraft.getMinecraft().getTextureMapBlocks().getAtlasSprite(
					t.toString())).collect(Collectors.toList()).toArray(new TextureAtlasSprite[0]);
			
			this.setParticleTexture(sprites[0]);
					
		}else{
			sprites = new TextureAtlasSprite[0];
		}
	}
	
	// ============================================== Parameter Setters ==============================================
	
	// Setters for parameters that affect all particles - these are implemented in this class (although they may be
	// reimplemented in subclasses)

	/** Sets the seed for this particle's randomly generated values and resets {@link ParticleWizardry#random} to use
	 * that seed. Implementations will differ between particle types; for example, ParticleLightning has an update
	 * period which changes the seed every few ticks, whereas ParticleVine simply retains the same seed for its entire
	 * lifetime. */
	public void setSeed(long seed){
		this.seed = seed;
		this.random = new Random(seed);
	}
	
	/** Sets whether the particle should render at full brightness or not. True if the particle is shaded, false if
	 * the particle always renders at full brightness. Defaults to false.*/
	public void setShaded(boolean shaded){
		this.shaded = shaded;
	}
	
	/** Sets this particle's gravity. True to enable gravity, false to disable. Defaults to false.*/
	public void setGravity(boolean gravity){
		this.particleGravity = gravity ? 1 : 0;
	}
	
	/** Sets this particle's collisions. True to enable block collisions, false to disable. Defaults to false.*/
	public void setCollisions(boolean canCollide){
		this.canCollide = canCollide;
	}
	
	/**
	 * Sets the velocity of the particle.
	 * @param vx The x velocity
	 * @param vy The y velocity
	 * @param vz The z velocity
	 */
	public void setVelocity(double vx, double vy, double vz){
		this.motionX = vx;
		this.motionY = vy;
		this.motionZ = vz;
	}
	
	/**
	 * Sets the spin parameters of the particle.
	 * @param radius The spin radius
	 * @param speed The spin speed in rotations per tick
	 */
	public void setSpin(double radius, double speed){
		this.radius = radius;
		this.speed = speed * 2 * Math.PI; // Converts rotations per tick into radians per tick for the trig functions
		this.angle = this.rand.nextFloat() * (float)Math.PI * 2; // Random start angle
		// Need to set the start position or the circle won't be centred on the correct position
		this.posX = relativeX - radius * MathHelper.cos(angle);
		this.posZ = relativeZ + radius * MathHelper.sin(angle);
		// Set these to the correct values
		this.relativeMotionX = motionX;
		this.relativeMotionY = motionY;
		this.relativeMotionZ = motionZ;
	}
	
	/**
	 * Links this particle to the given entity. This will cause its position and velocity to be relative to the entity.
	 * @param entity The entity to link to.
	 */
	public void setEntity(Entity entity){
		this.entity = entity;
		// Set these to the correct values
		if(entity != null){
			this.setPosition(this.entity.posX + relativeX, this.entity.posY
					+ relativeY, this.entity.posZ + relativeZ);
			this.prevPosX = this.posX;
			this.prevPosY = this.posY;
			this.prevPosZ = this.posZ;
			// Set these to the correct values
			this.relativeMotionX = motionX;
			this.relativeMotionY = motionY;
			this.relativeMotionZ = motionZ;
		}
	}
	
	// Overridden to set the initial colour values
	/**
	 * Sets the base colour of the particle. <i>Note that this also sets the fade colour so that particles without a
	 * fade colour do not change colour at all; as such fade colour must be set <b>after</b> calling this method.</i>
	 * @param r The red colour component
	 * @param g The green colour component
	 * @param b The blue colour component
	 */
	@Override
	public void setRBGColorF(float r, float g, float b){
		super.setRBGColorF(r, g, b);
		initialRed = r;
		initialGreen = g;
		initialBlue = b;
		// If fade colour is not specified, it defaults to the main colour - this method is always called first
		setFadeColour(r, g, b);
	}
	
	/**
	 * Sets the fade colour of the particle.
	 * @param r The red colour component
	 * @param g The green colour component
	 * @param b The blue colour component
	 */
	public void setFadeColour(float r, float g, float b){
		this.fadeRed = r;
		this.fadeGreen = g;
		this.fadeBlue = b;
	}
	
	/**
	 * Sets the direction this particle faces. This will cause the particle to render facing the given direction.
	 * @param yaw The yaw angle of this particle in degrees, where 0 is south.
	 * @param pitch The pitch angle of this particle in degrees, where 0 is horizontal.
	 */
	public void setFacing(float yaw, float pitch){
		this.yaw = yaw;
		this.pitch = pitch;
	}
	
	// Setters for parameters that only affect some particles - these are unimplemented in this class because they
	// doesn't make sense for most particles
	
	/**
	 * Sets the target position for this particle. This will cause it to stretch to touch the given position,
	 * if supported.
	 * @param x The x-coordinate of the target position.
	 * @param y The y-coordinate of the target position.
	 * @param z The z-coordinate of the target position.
	 */
	public void setTargetPosition(double x, double y, double z){
		// Does nothing for normal particles since normal particles always render at a single point
	}

	/**
	 * Sets the target point velocity for this particle. This will cause the position it stretches to touch to move
	 * at the given velocity. Has no effect unless {@link ParticleWizardry#setTargetVelocity(double, double, double)}
	 * is also used.
	 * @param vx The x velocity of the target point.
	 * @param vy The y velocity of the target point.
	 * @param vz The z velocity of the target point.
	 */
	public void setTargetVelocity(double vx, double vy, double vz){
		// Does nothing for normal particles since normal particles always render at a single point
	}
	
	/**
	 * Links this particle to the given target. This will cause it to stretch to touch the target, if supported.
	 * @param target The target to link to.
	 */
	public void setTargetEntity(Entity target){
		// Does nothing for normal particles since normal particles always render at a single point
	}

	/**
	 * Sets the length of this particle. This will cause it to stretch to touch a point this distance along its
	 * linked entity's line of sight.
	 * @param length The length to set.
	 */
	public void setLength(double length){
		// Does nothing for normal particles since normal particles always render at a single point
	}
	
	// ============================================== Method Overrides ==============================================
	
	@Override
	public int getFXLayer(){
		return sprites.length == 0 ? super.getFXLayer() : 1; // This has to be 1 for the TextureAtlasSprites to work
	}

	@Override
	public int getBrightnessForRender(float partialTick){
		return shaded ? super.getBrightnessForRender(partialTick) : 15728880;
	}
	
	/**
	 * Renders the particle. The mapping names given to the parameters in this method are very misleading; see below for
	 * details of what they actually do. (They're also in a strange order...)
	 * @param buffer The {@code BufferBuilder} object.
	 * @param viewer The entity whose viewpoint the particle is being rendered from; this should always be the
	 * client-side player.
	 * @param partialTicks The partial tick time.
	 * @param lookZ Equal to the cosine of {@code viewer.rotationYaw}. Will be -1 when facing north (negative Z), 0 when 
	 * east/west, and +1 when facing south (positive Z). Independent of pitch.
	 * @param lookY Equal to the cosine of {@code viewer.rotationPitch}. Will be 1 when facing directly up or down, and 0
	 * when facing directly horizontally.
	 * @param lookX Equal to the sine of {@code viewer.rotationYaw}.  Will be -1 when facing east (positive X), 0 when
	 * facing north/south, and +1 when facing west (negative X). Independent of pitch.
	 * @param lookXY Equal to {@code lookX} times the sine of {@code viewer.rotationPitch}. Will be 0 when facing directly horizontal.
	 * When facing directly up, will be equal to {@code -lookX}. When facing directly down, will be equal to {@code lookX}. 
	 * @param lookYZ Equal to {@code -lookZ} times the sine of {@code viewer.rotationPitch}. Will be 0 when facing directly horizontal.
	 * When facing directly up, will be equal to {@code -lookZ}. When facing directly down, will be equal to {@code lookZ}. 
	 */
	// Fun fact: unlike entities, particles don't seem to bother checking the camera frustum...
	@Override
	public void renderParticle(BufferBuilder buffer, Entity viewer, float partialTicks, float lookZ, float lookY,
			float lookX, float lookXY, float lookYZ){

		updateEntityLinking(viewer, partialTicks);
		
		if(Float.isNaN(this.yaw) || Float.isNaN(this.pitch)){
			// Normal behaviour (rotates to face the viewer)
			drawParticle(buffer, viewer, partialTicks, lookZ, lookY, lookX, lookXY, lookYZ);
		}else{
			
			// Specific rotation
			
			// Copied from ActiveRenderInfo; converts yaw and pitch into the weird parameters used by renderParticle.
			// The 1st/3rd person distinction has been removed since this has nothing to do with the view angle.
			
			float degToRadFactor = 0.017453292f; // Conversion from degrees to radians
			
	        float rotationX = MathHelper.cos(yaw * degToRadFactor);
	        float rotationZ = MathHelper.sin(yaw * degToRadFactor);
	        float rotationY = MathHelper.cos(pitch * degToRadFactor);
	        float rotationYZ = -rotationZ * MathHelper.sin(pitch * degToRadFactor);
	        float rotationXY = rotationX * MathHelper.sin(pitch * degToRadFactor);
	        
			drawParticle(buffer, viewer, partialTicks, rotationX, rotationY, rotationZ, rotationYZ, rotationXY);
		}
	}

	/**
	 * Delegate function for {@link ParticleWizardry#renderParticle(BufferBuilder, Entity, float, float, float, float, float, float)};
	 * does the actual rendering. Subclasses should override this method instead of renderParticle. By default, this
	 * method simply calls super.renderParticle.
	 */
	protected void drawParticle(BufferBuilder buffer, Entity viewer, float partialTicks, float rotationX, float rotationY, float rotationZ, float rotationYZ, float rotationXY){
		super.renderParticle(buffer, viewer, partialTicks, rotationX, rotationY, rotationZ, rotationYZ, rotationXY);
	}

	protected void updateEntityLinking(Entity viewer, float partialTicks){
		// TODO: Still not working, it seems this bug was a thing back in 4.2.x anyway
		if(this.entity != null){
			// This is kind of cheating but we know it's always a constant velocity so it works fine
			prevPosX = posX + entity.prevPosX - entity.posX - relativeMotionX * (1-partialTicks);
			prevPosY = posY + entity.prevPosY - entity.posY - relativeMotionY * (1-partialTicks);
			prevPosZ = posZ + entity.prevPosZ - entity.posZ - relativeMotionZ * (1-partialTicks);
		}else if(this.getFXLayer() == 3){
			// Not sure why, but when fx layer is 3, the interp pos is wrong when not linked to an entity
			interpPosX = viewer.lastTickPosX + (viewer.posX - viewer.lastTickPosX) * (double)partialTicks;
			interpPosY = viewer.lastTickPosY + (viewer.posY - viewer.lastTickPosY) * (double)partialTicks;
			interpPosZ = viewer.lastTickPosZ + (viewer.posZ - viewer.lastTickPosZ) * (double)partialTicks;
		}
	}
	
	@Override
	public void onUpdate(){

		super.onUpdate();

		if(this.canCollide && this.onGround){
			// I reject your friction and substitute my own!
			this.motionX /= 0.699999988079071D;
			this.motionZ /= 0.699999988079071D;
		}

		if(entity != null || radius > 0){

			double x = relativeX;
			double y = relativeY;
			double z = relativeZ;
			
			// Entity linking
			if(this.entity != null){
				if(this.entity.isDead){
					this.setExpired();
				}else{
					x += this.entity.posX;
					y += this.entity.posY;
					z += this.entity.posZ;
				}
			}
			
			// Spin
			if(radius > 0){
				angle += speed;
				// If the particle has spin, x/z relative position is used as centre and coords are changed each tick
				x += radius * -MathHelper.cos(angle);
				z += radius * MathHelper.sin(angle);
			}

			this.setPosition(x, y, z);

			this.relativeX += relativeMotionX;
			this.relativeY += relativeMotionY;
			this.relativeZ += relativeMotionZ;
		}
		
		// Colour fading
		float ageFraction = (float)this.particleAge / (float)this.particleMaxAge;
		// No longer uses setRBGColorF because that method now also sets the initial values
		this.particleRed   = this.initialRed   + (this.fadeRed   - this.initialRed)   * ageFraction;
		this.particleGreen = this.initialGreen + (this.fadeGreen - this.initialGreen) * ageFraction;
		this.particleBlue  = this.initialBlue  + (this.fadeBlue  - this.initialBlue)  * ageFraction;
		
		// Animation
		if(sprites.length > 1){
			// Math.min included for safety so the index cannot possibly exceed the length - 1 an cause an AIOOBE
			// (which would probably otherwise happen if particleAge == particleMaxAge)
			this.setParticleTexture(sprites[Math.min((int)(ageFraction * sprites.length), sprites.length - 1)]);
		}

		// Collision spreading
		if(canCollide){

			if(this.motionX == 0 && this.prevVelX != 0){ // If the particle just collided in x
				// Reduce lateral velocity so the added spread speed actually has an effect
				this.motionY *= IMPACT_FRICTION;
				this.motionZ *= IMPACT_FRICTION;
				// Add random velocity in y and z proportional to the impact velocity
				this.motionY += (rand.nextDouble()*2 - 1) * this.prevVelX * SPREAD_FACTOR;
				this.motionZ += (rand.nextDouble()*2 - 1) * this.prevVelX * SPREAD_FACTOR;
			}

			if(this.motionY == 0 && this.prevVelY != 0){ // If the particle just collided in y
				// Reduce lateral velocity so the added spread speed actually has an effect
				this.motionX *= IMPACT_FRICTION;
				this.motionZ *= IMPACT_FRICTION;
				// Add random velocity in x and z proportional to the impact velocity
				this.motionX += (rand.nextDouble()*2 - 1) * this.prevVelY * SPREAD_FACTOR;
				this.motionZ += (rand.nextDouble()*2 - 1) * this.prevVelY * SPREAD_FACTOR;
			}

			if(this.motionZ == 0 && this.prevVelZ != 0){ // If the particle just collided in z
				// Reduce lateral velocity so the added spread speed actually has an effect
				this.motionX *= IMPACT_FRICTION;
				this.motionY *= IMPACT_FRICTION;
				// Add random velocity in x and y proportional to the impact velocity
				this.motionX += (rand.nextDouble()*2 - 1) * this.prevVelZ * SPREAD_FACTOR;
				this.motionY += (rand.nextDouble()*2 - 1) * this.prevVelZ * SPREAD_FACTOR;
			}

			double searchRadius = 20;

			List<Entity> nearbyEntities = EntityUtils.getEntitiesWithinRadius(searchRadius, this.posX,
					this.posY, this.posZ, world, Entity.class);

			if(nearbyEntities.stream().anyMatch(e -> e instanceof ICustomHitbox
					&& ((ICustomHitbox)e).calculateIntercept(new Vec3d(posX, posY, posZ),
					new Vec3d(prevPosX, prevPosY, prevPosZ), 0) != null)) this.setExpired();

		}

		this.prevVelX = motionX;
		this.prevVelY = motionY;
		this.prevVelZ = motionZ;
	}

	// Overridden and copied to fix the collision behaviour
	@Override
	public void move(double x, double y, double z){

		double origY = y;
		double origX = x;
		double origZ = z;

		if(this.canCollide){

			List<AxisAlignedBB> list = this.world.getCollisionBoxes(null, this.getBoundingBox().expand(x, y, z));

			for(AxisAlignedBB axisalignedbb : list){
				y = axisalignedbb.calculateYOffset(this.getBoundingBox(), y);
			}

			this.setBoundingBox(this.getBoundingBox().offset(0.0D, y, 0.0D));

			for(AxisAlignedBB axisalignedbb1 : list){
				x = axisalignedbb1.calculateXOffset(this.getBoundingBox(), x);
			}

			this.setBoundingBox(this.getBoundingBox().offset(x, 0.0D, 0.0D));

			for(AxisAlignedBB axisalignedbb2 : list){
				z = axisalignedbb2.calculateZOffset(this.getBoundingBox(), z);
			}

			this.setBoundingBox(this.getBoundingBox().offset(0.0D, 0.0D, z));

		}else{
			this.setBoundingBox(this.getBoundingBox().offset(x, y, z));
		}

		this.resetPositionToBB();
		this.onGround = origY != y && origY < 0.0D;

		if(origX != x) this.motionX = 0.0D;
		if(origY != y) this.motionY = 0.0D; // Why doesn't Particle do this for y?
		if(origZ != z) this.motionZ = 0.0D;
	}


	// =============================================== Helper Methods ===============================================

	/** Internal overload for {@link ParticleWizardry#generateTextures(String, String, int)} which uses wizardry's mod
	 * ID automatically. */
	public static ResourceLocation[] generateTextures(String stem, int n){
		return generateTextures(Wizardry.MODID, stem, n);
	}

	/** Static helper method that generates an array of n ResourceLocations using the particle file naming convention,
	 * which is the given stem plus an underscore plus the integer index. */
	public static ResourceLocation[] generateTextures(String modID, String stem, int n){

		ResourceLocation[] textures = new ResourceLocation[n];
		
		for(int i=0; i<n; i++){
			textures[i] = new ResourceLocation(modID, "particle/" + stem + "_" + i);
		}
		
		return textures;
	}

	/** Internal overload for {@link ParticleWizardry#generateTextures(String, String, int, int)} which uses wizardry's
	 * mod ID automatically. */
	static ResourceLocation[][] generateTextures(String stem, int m, int n){
		return generateTextures(Wizardry.MODID, stem, m, n);
	}
	
	/** Static helper method that generates a 2D m x n array of ResourceLocations using the particle file naming
	 * convention, which is the given stem plus an underscore plus the first index, plus an underscore plus the second
	 * index. Useful for animated particles that also pick a random animation strip. */
	public static ResourceLocation[][] generateTextures(String modID, String stem, int m, int n){

		ResourceLocation[][] textures = new ResourceLocation[m][n];
		
		for(int i=0; i<m; i++){
			for(int j=0; j<n; j++){
				textures[i][j] = new ResourceLocation(modID, "particle/" + stem + "_" + i + "_" + j);
			}
		}
		
		return textures;
	}

	/**
	 * Associates the given {@link ResourceLocation} with the given {@link IWizardryParticleFactory}, allowing it to
	 * be used in the {@link electroblob.wizardry.util.ParticleBuilder ParticleBuilder}. This is a similar concept to
	 * registering entity renderers, in that it associates the client-only bit with its common-code counterpart - but
	 * of course, particles are client-side only so a simple identifier is all that is necessary. As with entity
	 * renderers, <b>this method may only be called from the client side</b>, probably a client proxy.
	 * @param name The {@link ResourceLocation} to use for the particle. This effectively replaces the particle type
	 *             enum from previous versions. Keep a reference to this somewhere in <b>common</b> code for use later.
	 * @param factory A {@link IWizardryParticleFactory} that produces your particle. A constructor reference is usually
	 *                sufficient.
	 */
	public static void registerParticle(ResourceLocation name, IWizardryParticleFactory factory){
		ClientProxy.addParticleFactory(name, factory);
	}

	/** Simple particle factory interface which takes a world and a position and returns a particle. Used (via method
	 * references) in the client proxy to link particle enum types to actual particle classes. */
	@SideOnly(Side.CLIENT)
	@FunctionalInterface
	public interface IWizardryParticleFactory {
	    ParticleWizardry createParticle(World world, double x, double y, double z);
	}
}