From 2a378190aeb85b134af26e7d74c3e5433a1dfa0a Mon Sep 17 00:00:00 2001
From: luisc <lc0508383@gmail.com>
Date: Sun, 5 Sep 2021 21:53:58 -0500
Subject: [PATCH] Added EntityCustomFX class, used for spawning custom
 particles on entities.

---
 .../noppes/npcs/client/fx/EntityCustomFX.java | 126 ++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 src/main/java/noppes/npcs/client/fx/EntityCustomFX.java

diff --git a/src/main/java/noppes/npcs/client/fx/EntityCustomFX.java b/src/main/java/noppes/npcs/client/fx/EntityCustomFX.java
new file mode 100644
index 000000000..bd6ee8456
--- /dev/null
+++ b/src/main/java/noppes/npcs/client/fx/EntityCustomFX.java
@@ -0,0 +1,126 @@
+package noppes.npcs.client.fx;
+
+import net.minecraft.client.particle.EntityFX;
+import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.entity.Entity;
+import net.minecraft.util.ResourceLocation;
+import noppes.npcs.ModelPartData;
+import noppes.npcs.client.ClientProxy;
+import org.lwjgl.opengl.GL11;
+
+public class EntityCustomFX extends EntityFX {
+    private Entity entity;
+    private final ResourceLocation location;
+    private boolean move = true;
+    private float startX = 0, startY = 0, startZ = 0;
+
+    public float scale1 = 1.0F;
+    public float scale2 = 1.0F;
+    public float scaleRate = 1.0F;
+    public int scaleRateStart = 0;
+
+    public float alpha1 = 1.0F;
+    public float alpha2 = 0;
+    public float alphaRate = 0.0F;
+    public int alphaRateStart = 0;
+
+	public EntityCustomFX(Entity entity, double x, double y, double z,
+                          double motionX, double motionY, double motionZ, float gravity,
+                          float scale1, float scale2, float scaleRate, int scaleRateStart,
+                          float alpha1, float alpha2, float alphaRate, int alphaRateStart,
+                          int age,
+                          ModelPartData data) {
+		super(entity.worldObj, x, y, z, motionX, motionY, motionZ);
+
+        this.scale1 = scale1;
+        this.scale2 = scale2;
+        this.scaleRate = Math.abs(scaleRate);
+        this.scaleRateStart = scaleRateStart;
+        particleScale = scale1;
+        if(scale1 > scale2)
+            this.scaleRate *= -1;
+
+        this.alpha1 = alpha1;
+        this.alpha2 = alpha2;
+        this.alphaRate = Math.abs(alphaRate);
+        this.alphaRateStart = alphaRateStart;
+        particleAlpha = alpha1;
+        if(alpha1 > alpha2)
+            this.alphaRate *= -1;
+
+        particleGravity = gravity/0.04F;
+        particleMaxAge = age;
+
+        this.motionX = motionX;
+        this.motionY = motionY;
+        this.motionZ = motionZ;
+
+		this.entity = entity;
+        noClip = true;
+
+        particleRed = (data.color >> 16 & 255) / 255f;
+        particleGreen = (data.color >> 8  & 255) / 255f;
+        particleBlue = (data.color & 255) / 255f;
+        
+        if(Math.floor(Math.random()*3) == 1){
+        	move = false;
+            this.startX = (float) entity.posX;
+            this.startY = (float) entity.posY;
+            this.startZ = (float) entity.posZ;
+        }
+
+        location = new ResourceLocation(data.texture);
+	}
+
+	@Override
+    public void renderParticle(Tessellator par1Tessellator, float par2, float par3, float par4, float par5, float par6, float par7)
+    {
+		if(move){
+			startX = (float)(entity.prevPosX + (entity.posX - entity.prevPosX) * (double)par2);
+			startY = (float)(entity.prevPosY + (entity.posY - entity.prevPosY) * (double)par2);
+			startZ = (float)(entity.prevPosZ + (entity.posZ - entity.prevPosZ) * (double)par2);
+		}
+        Tessellator tessellator = Tessellator.instance;
+        tessellator.draw();
+
+        float scale = this.scaleRate / (float)particleMaxAge;
+        if((this.scaleRate < 0 && particleScale+scale < this.scale2) || (this.scaleRate > 0 && particleScale+scale > this.scale2))
+            particleScale = this.scale2;
+        else if(particleAge >= this.scaleRateStart)
+            particleScale += scale;
+
+        float alpha = this.alphaRate / (float)particleMaxAge;
+        if((this.alphaRate < 0 && particleAlpha+alpha < this.alpha2) || (this.alphaRate > 0 && particleAlpha+alpha > this.alpha2))
+            particleAlpha = this.alpha2;
+        else if(particleAge >= this.alphaRateStart)
+            particleAlpha += alpha;
+        
+    	ClientProxy.bindTexture(location);
+
+        float f = 0.0f;
+        float f1 = 1.0f;
+        float f2 = 0.0f;
+        float f3 = 1.0f;
+        float f4 = 0.1F * particleScale;
+        float f5 = (float)(((prevPosX + (posX - prevPosX) * (double)par2) - interpPosX) + startX);
+        float f6 = (float)(((prevPosY + (posY - prevPosY) * (double)par2) - interpPosY) + startY);
+        float f7 = (float)(((prevPosZ + (posZ - prevPosZ) * (double)par2) - interpPosZ) + startZ);
+
+        GL11.glColor4f(1, 1, 1, 1.0F);
+        tessellator.startDrawingQuads();
+        tessellator.setBrightness(240);
+        par1Tessellator.setColorOpaque_F(1, 1, 1);
+        par1Tessellator.setColorRGBA_F(particleRed, particleGreen, particleBlue, particleAlpha);
+        par1Tessellator.addVertexWithUV(f5 - par3 * f4 - par6 * f4, f6 - par4 * f4, f7 - par5 * f4 - par7 * f4, f1, f3);
+        par1Tessellator.addVertexWithUV((f5 - par3 * f4) + par6 * f4, f6 + par4 * f4, (f7 - par5 * f4) + par7 * f4, f1, f2);
+        par1Tessellator.addVertexWithUV(f5 + par3 * f4 + par6 * f4, f6 + par4 * f4, f7 + par5 * f4 + par7 * f4, f, f2);
+        par1Tessellator.addVertexWithUV((f5 + par3 * f4) - par6 * f4, f6 - par4 * f4, (f7 + par5 * f4) - par7 * f4, f, f3);
+
+        tessellator.draw();
+        tessellator.startDrawingQuads();
+    }
+    
+    public int getFXLayer(){
+    	return 0;
+    }
+}