RocketFx.java

package zmaster587.advancedRocketry.entity.fx;

import org.lwjgl.opengl.GL11;

import net.minecraft.client.Minecraft;
import net.minecraft.client.particle.EntityFX;
import net.minecraft.client.renderer.OpenGlHelper;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.util.ResourceLocation;
import net.minecraft.world.World;

public class RocketFx extends EntityFX {

	public static final ResourceLocation icon = new ResourceLocation("advancedrocketry:textures/particle/soft.png");

	
	public RocketFx(World world, double x,
			double y, double z, double motx, double moty, double motz, float scale) {
		super(world, x, y, z, motx, moty, motz);
		
		this.prevPosX = this.posX = this.lastTickPosX = x;
		this.prevPosY = this.posY = this.lastTickPosY = y;
		this.prevPosZ = this.posZ = this.lastTickPosZ = z;
		
        this.particleRed = 0.9F + this.rand.nextFloat()/10f;
        this.particleGreen = 0.6F + this.rand.nextFloat()/5f;
        this.particleBlue = 0.0F;
        this.setSize(0.12F*scale, 0.12F*scale);
        this.particleScale *= (this.rand.nextFloat() * 0.6F + 6F)*scale;
        this.motionX = motx;
        this.motionY = moty;
        this.motionZ = motz;
        this.particleMaxAge = (int)(8.0D / (Math.random() * 0.8D + 0.6D));
	}
	public RocketFx(World world, double x,
			double y, double z, double motx, double moty, double motz) {
		this(world, x, y,z, motx, moty, motz, 1.0f);
	}

	@Override
	public void renderParticle(Tessellator tess, float x1,
			float y1, float z1, float x2,
			float y2, float z2) {
		
		Minecraft.getMinecraft().getTextureManager().bindTexture(icon);
		
		GL11.glPushMatrix();
		//GL11.glDisable(GL11.GL_BLEND);
		GL11.glBlendFunc( GL11.GL_SRC_ALPHA, GL11.GL_ONE );
		
		
        float f11 = (float)(this.prevPosX + (this.posX - this.prevPosX) * (double)x1 - interpPosX);
        float f12 = (float)(this.prevPosY + (this.posY - this.prevPosY) * (double)x1 - interpPosY);
        float f13 = (float)(this.prevPosZ + (this.posZ - this.prevPosZ) * (double)x1 - interpPosZ);
        float f10 = 0.1F * this.particleScale;
        
        
        
        tess.setColorRGBA_F(this.particleRed, this.particleGreen, this.particleBlue, 1f);
        
        tess.addVertexWithUV((double)(f11 - y1 * f10 - y2 * f10), (double)(f12 - z1 * f10), (double)(f13 - x2 * f10 - z2 * f10), 1, 1);
        tess.addVertexWithUV((double)(f11 - y1 * f10 + y2 * f10), (double)(f12 + z1 * f10), (double)(f13 - x2 * f10 + z2 * f10), 1, 0);
        tess.addVertexWithUV((double)(f11 + y1 * f10 + y2 * f10), (double)(f12 + z1 * f10), (double)(f13 + x2 * f10 + z2 * f10), 0, 0);
        tess.addVertexWithUV((double)(f11 + y1 * f10 - y2 * f10), (double)(f12 - z1 * f10), (double)(f13 + x2 * f10 - z2 * f10), 0, 1);
        //GL11.glEnable(GL11.GL_BLEND);
        
		GL11.glPopMatrix();
	}
	
	@Override
	public int getFXLayer() {
		return 2;
	}
	
	@Override
	public void onUpdate() {
        this.prevPosX = this.posX;
        this.prevPosY = this.posY;
        this.prevPosZ = this.posZ;
        
        //Change color and alpha over lifespan
        this.particleAlpha = 1- this.particleAge/ (float)this.particleMaxAge;
        this.particleGreen -= this.particleGreen * this.particleAge/ ((float)this.particleMaxAge*2);
        
        if (this.particleAge++ >= this.particleMaxAge)
        {
            this.setDead();
        }
        
        this.setPosition(posX + this.motionX, posY + this.motionY, posZ  + this.motionZ);
	}
}