NaturesAura/src/main/java/de/ellpeck/naturesaura/blocks/tiles/render/RenderEnderCrate.java

package de.ellpeck.naturesaura.blocks.tiles.render;

import de.ellpeck.naturesaura.blocks.tiles.TileEntityEnderCrate;
import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.BufferBuilder;
import net.minecraft.client.renderer.GLAllocation;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.tileentity.TileEntitySpecialRenderer;
import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

import java.nio.FloatBuffer;
import java.util.Random;

@SideOnly(Side.CLIENT)
public class RenderEnderCrate extends TileEntitySpecialRenderer<TileEntityEnderCrate> {
    private static final ResourceLocation END_SKY_TEXTURE = new ResourceLocation("textures/environment/end_sky.png");
    private static final ResourceLocation END_PORTAL_TEXTURE = new ResourceLocation("textures/entity/end_portal.png");
    private static final Random RANDOM = new Random(31100L);
    private static final FloatBuffer MODELVIEW = GLAllocation.createDirectFloatBuffer(16);
    private static final FloatBuffer PROJECTION = GLAllocation.createDirectFloatBuffer(16);
    private final FloatBuffer buffer = GLAllocation.createDirectFloatBuffer(16);

    @Override
    public void render(TileEntityEnderCrate te, double x, double y, double z, float partialTicks, int destroyStage, float alpha) {
        GlStateManager.disableLighting();
        RANDOM.setSeed(31100L);
        GlStateManager.getFloat(2982, MODELVIEW);
        GlStateManager.getFloat(2983, PROJECTION);
        double d0 = x * x + y * y + z * z;
        int i = this.getPasses(d0);
        float f = this.getOffset();
        boolean flag = false;

        for (int j = 0; j < i; ++j) {
            GlStateManager.pushMatrix();
            float f1 = 2.0F / (float) (18 - j);

            if (j == 0) {
                this.bindTexture(END_SKY_TEXTURE);
                f1 = 0.15F;
                GlStateManager.enableBlend();
                GlStateManager.blendFunc(GlStateManager.SourceFactor.SRC_ALPHA, GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA);
            }

            if (j >= 1) {
                this.bindTexture(END_PORTAL_TEXTURE);
                flag = true;
                Minecraft.getMinecraft().entityRenderer.setupFogColor(true);
            }

            if (j == 1) {
                GlStateManager.enableBlend();
                GlStateManager.blendFunc(GlStateManager.SourceFactor.ONE, GlStateManager.DestFactor.ONE);
            }

            GlStateManager.texGen(GlStateManager.TexGen.S, 9216);
            GlStateManager.texGen(GlStateManager.TexGen.T, 9216);
            GlStateManager.texGen(GlStateManager.TexGen.R, 9216);
            GlStateManager.texGen(GlStateManager.TexGen.S, 9474, this.getBuffer(1.0F, 0.0F, 0.0F, 0.0F));
            GlStateManager.texGen(GlStateManager.TexGen.T, 9474, this.getBuffer(0.0F, 1.0F, 0.0F, 0.0F));
            GlStateManager.texGen(GlStateManager.TexGen.R, 9474, this.getBuffer(0.0F, 0.0F, 1.0F, 0.0F));
            GlStateManager.enableTexGenCoord(GlStateManager.TexGen.S);
            GlStateManager.enableTexGenCoord(GlStateManager.TexGen.T);
            GlStateManager.enableTexGenCoord(GlStateManager.TexGen.R);
            GlStateManager.popMatrix();
            GlStateManager.matrixMode(5890);
            GlStateManager.pushMatrix();
            GlStateManager.loadIdentity();
            GlStateManager.translate(0.5F, 0.5F, 0.0F);
            GlStateManager.scale(0.5F, 0.5F, 1.0F);
            float f2 = (float) (j + 1);
            GlStateManager.translate(17.0F / f2, (2.0F + f2 / 1.5F) * ((float) Minecraft.getSystemTime() % 800000.0F / 800000.0F), 0.0F);
            GlStateManager.rotate((f2 * f2 * 4321.0F + f2 * 9.0F) * 2.0F, 0.0F, 0.0F, 1.0F);
            GlStateManager.scale(4.5F - f2 / 4.0F, 4.5F - f2 / 4.0F, 1.0F);
            GlStateManager.multMatrix(PROJECTION);
            GlStateManager.multMatrix(MODELVIEW);
            Tessellator tessellator = Tessellator.getInstance();
            BufferBuilder bufferbuilder = tessellator.getBuffer();
            bufferbuilder.begin(7, DefaultVertexFormats.POSITION_COLOR);
            float f3 = (RANDOM.nextFloat() * 0.5F + 0.1F) * f1;
            float f4 = (RANDOM.nextFloat() * 0.5F + 0.4F) * f1;
            float f5 = (RANDOM.nextFloat() * 0.5F + 0.5F) * f1;

            float indent = 1.95F / 16F;
            bufferbuilder.pos(x + indent, y + (double) f, z - indent + 1.0D).color(f3, f4, f5, 1.0F).endVertex();
            bufferbuilder.pos(x - indent + 1.0D, y + (double) f, z - indent + 1.0D).color(f3, f4, f5, 1.0F).endVertex();
            bufferbuilder.pos(x - indent + 1.0D, y + (double) f, z + indent).color(f3, f4, f5, 1.0F).endVertex();
            bufferbuilder.pos(x + indent, y + (double) f, z + indent).color(f3, f4, f5, 1.0F).endVertex();

            tessellator.draw();
            GlStateManager.popMatrix();
            GlStateManager.matrixMode(5888);
            this.bindTexture(END_SKY_TEXTURE);
        }

        GlStateManager.disableBlend();
        GlStateManager.disableTexGenCoord(GlStateManager.TexGen.S);
        GlStateManager.disableTexGenCoord(GlStateManager.TexGen.T);
        GlStateManager.disableTexGenCoord(GlStateManager.TexGen.R);
        GlStateManager.enableLighting();

        if (flag) {
            Minecraft.getMinecraft().entityRenderer.setupFogColor(false);
        }
    }

    protected int getPasses(double dist) {
        int i;

        if (dist > 36864.0D) {
            i = 1;
        } else if (dist > 25600.0D) {
            i = 3;
        } else if (dist > 16384.0D) {
            i = 5;
        } else if (dist > 9216.0D) {
            i = 7;
        } else if (dist > 4096.0D) {
            i = 9;
        } else if (dist > 1024.0D) {
            i = 11;
        } else if (dist > 576.0D) {
            i = 13;
        } else if (dist > 256.0D) {
            i = 14;
        } else {
            i = 15;
        }

        return i;
    }

    protected float getOffset() {
        return 1.001F;
    }

    private FloatBuffer getBuffer(float a, float b, float c, float d) {
        this.buffer.clear();
        this.buffer.put(a).put(b).put(c).put(d);
        this.buffer.flip();
        return this.buffer;
    }
}