TankFluidRenderer.java

package crazypants.enderio.machine.tank;

import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.tileentity.TileEntitySpecialRenderer;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.IIcon;

import org.lwjgl.opengl.GL11;

import com.enderio.core.client.render.BoundingBox;
import com.enderio.core.client.render.CubeRenderer;
import com.enderio.core.client.render.RenderUtil;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import crazypants.enderio.tool.SmartTank;

@SideOnly(Side.CLIENT)
public class TankFluidRenderer extends TileEntitySpecialRenderer {

  @Override
  public void renderTileEntityAt(TileEntity te, double x, double y, double z, float partialTick) {

    TileTank tank = (TileTank)te;
    if(tank.tank.getFluidAmount() <= 0) {
      return;
    }
    renderTankFluid(tank.tank, (float)x, (float)y, (float)z);
  }

  public static void renderTankFluid(SmartTank tank, float x, float y, float z) {
    if(tank == null || tank.getFluid() == null) {
      return;
    }
    IIcon icon = tank.getFluid().getFluid().getStillIcon();
    if(icon != null) {
      float fullness = tank.getFilledRatio();
      y += 0.01f; // prevent bottom side z-fighting
      float scale = 0.98f;
      float yScale = 0.98f * fullness;
      BoundingBox bb = BoundingBox.UNIT_CUBE.scale(scale, yScale , scale);
      bb = bb.translate(0, -(1 - yScale)/2, 0);

      GL11.glPushAttrib(GL11.GL_ENABLE_BIT);
      GL11.glEnable(GL11.GL_CULL_FACE);
      GL11.glDisable(GL11.GL_LIGHTING);
      GL11.glEnable(GL11.GL_BLEND);
      GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);

      RenderUtil.bindBlockTexture();

      Tessellator.instance.startDrawingQuads();
      Tessellator.instance.addTranslation(x, y, z);
      CubeRenderer.render(bb, icon);
      Tessellator.instance.addTranslation(-x, -y, -z);
      Tessellator.instance.draw();

      GL11.glPopAttrib();
    }
  }

}