Electro-Magic-Tools/src/main/java/emt/client/renderer/RenderShield.java

package emt.client.renderer;

import emt.EMT;
import emt.entity.EntityShield;
import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.GLAllocation;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.entity.Render;
import net.minecraft.entity.Entity;
import net.minecraft.util.MathHelper;
import net.minecraft.util.ResourceLocation;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL12;

import static org.lwjgl.opengl.GL11.*;

public class RenderShield extends Render {
	private static final ResourceLocation shieldTexture = new ResourceLocation(EMT.TEXTURE_PATH, "textures/models/shield.png");
	static int glCallList;

	static {
		glCallList = GLAllocation.generateDisplayLists(3);
		GL11.glPushMatrix();
		GL11.glNewList(glCallList, GL11.GL_COMPILE);

		Tessellator tessellator = Tessellator.instance;

		float sin1;
		float cos1;

		float sin2;
		float cos2;

		float hsin1 = -1;
		float hcos1 = 0;

		float hsin2;
		float hcos2;

		tessellator.startDrawingQuads();
		for (float h = -90; h < 90; h += 15) {
			sin1 = 0;
			cos1 = 1;

			hsin2 = MathHelper.sin((float) Math.toRadians(h + 15));
			hcos2 = MathHelper.cos((float) Math.toRadians(h + 15));

			for (float angle = 0; angle < 360; angle += 15) {
				sin2 = MathHelper.sin((float) Math.toRadians(angle + 15));
				cos2 = MathHelper.cos((float) Math.toRadians(angle + 15));

				tessellator.addVertexWithUV(sin1 * hcos1 * 2, hsin1 * 2, cos1 * hcos1 * 2, 1, 1);
				tessellator.addVertexWithUV(sin1 * hcos2 * 2, hsin2 * 2, cos1 * hcos2 * 2, 1, 0);
				tessellator.addVertexWithUV(sin2 * hcos2 * 2, hsin2 * 2, cos2 * hcos2 * 2, 0, 0);
				tessellator.addVertexWithUV(sin2 * hcos1 * 2, hsin1 * 2, cos2 * hcos1 * 2, 0, 1);

				sin1 = sin2;
				cos1 = cos2;
			}

			hsin1 = hsin2;
			hcos1 = hcos2;
		}
		tessellator.draw();

		GL11.glEndList();
	}

	@Override
	public void doRender(Entity entityShield, double x, double y, double z, float par8, float par9) {
		this.bindEntityTexture(entityShield);

		glEnable(GL_ALPHA_TEST);
		glAlphaFunc(GL_GREATER, 0);
		glEnable(GL_BLEND);
		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
		glPushAttrib(GL_LIGHTING);
		glDisable(GL_LIGHTING);
		glDisable(GL_CULL_FACE);

		glPushMatrix();
		if (((EntityShield) entityShield).owner != null && !Minecraft.getMinecraft().thePlayer.getDisplayName().equals(((EntityShield) entityShield).owner.getDisplayName())) {
			glTranslated(x, y, z);
		}

		glCallList(this.glCallList);

		glPopMatrix();
		glPopAttrib();
		glDisable(GL12.GL_RESCALE_NORMAL);
	}

	@Override
	protected ResourceLocation getEntityTexture(Entity texture) {
		return shieldTexture;
	}

}