public void drawLiquidRect(int startU, int startV, Icon par3Icon, int endU, int endV) {
   Tessellator tessellator = Tessellator.instance;
   tessellator.startDrawingQuads();
   tessellator.addVertexWithUV(
       startU + 0,
       startV + endV,
       this.zLevel,
       par3Icon.getMinU(),
       par3Icon.getMaxV()); // Bottom left
   tessellator.addVertexWithUV(
       startU + endU,
       startV + endV,
       this.zLevel,
       par3Icon.getMaxU(),
       par3Icon.getMaxV()); // Bottom right
   tessellator.addVertexWithUV(
       startU + endU,
       startV + 0,
       this.zLevel,
       par3Icon.getMaxU(),
       par3Icon.getMinV()); // Top right
   tessellator.addVertexWithUV(
       startU + 0, startV + 0, this.zLevel, par3Icon.getMinU(), par3Icon.getMinV()); // Top left
   tessellator.draw();
 }
  public static boolean renderBlockRedstoneWire(
      RenderBlocks r,
      IBlockAccess blockAccess,
      Block par1Block,
      int par2,
      int par3,
      int par4,
      Icon override) {
    Tessellator tessellator = Tessellator.instance;

    int i = blockAccess.getBlockMetadata(par2, par3, par4);
    Icon icon = BlockRedstoneWire.func_94409_b("cross");
    Icon icon1 = BlockRedstoneWire.func_94409_b("line");
    Icon icon2 = BlockRedstoneWire.func_94409_b("cross_overlay");
    Icon icon3 = BlockRedstoneWire.func_94409_b("line_overlay");
    if (!Minecraft.oldlighting) {
      tessellator.setBrightness(
          par1Block.getMixedBrightnessForBlock(blockAccess, par2, par3, par4));
    }
    float f =
        Minecraft.oldlighting ? par1Block.getBlockBrightness(blockAccess, par2, par3, par4) : 1.0F;
    float f1 = (float) i / 15F;
    float f2 = f1 * 0.6F + 0.4F;

    if (i == 0) {
      f2 = 0.3F;
    }

    float f3 = f1 * f1 * 0.7F - 0.5F;
    float f4 = f1 * f1 * 0.6F - 0.7F;

    if (f3 < 0.0F) {
      f3 = 0.0F;
    }

    if (f4 < 0.0F) {
      f4 = 0.0F;
    }

    tessellator.setColorOpaque_F(f * f2, f * f3, f * f4);
    boolean flag =
        BlockRedstoneWire.isPowerProviderOrWire(blockAccess, par2 - 1, par3, par4, 1)
            || !blockAccess.isBlockNormalCube(par2 - 1, par3, par4)
                && BlockRedstoneWire.isPowerProviderOrWire(
                    blockAccess, par2 - 1, par3 - 1, par4, -1);
    boolean flag1 =
        BlockRedstoneWire.isPowerProviderOrWire(blockAccess, par2 + 1, par3, par4, 3)
            || !blockAccess.isBlockNormalCube(par2 + 1, par3, par4)
                && BlockRedstoneWire.isPowerProviderOrWire(
                    blockAccess, par2 + 1, par3 - 1, par4, -1);
    boolean flag2 =
        BlockRedstoneWire.isPowerProviderOrWire(blockAccess, par2, par3, par4 - 1, 2)
            || !blockAccess.isBlockNormalCube(par2, par3, par4 - 1)
                && BlockRedstoneWire.isPowerProviderOrWire(
                    blockAccess, par2, par3 - 1, par4 - 1, -1);
    boolean flag3 =
        BlockRedstoneWire.isPowerProviderOrWire(blockAccess, par2, par3, par4 + 1, 0)
            || !blockAccess.isBlockNormalCube(par2, par3, par4 + 1)
                && BlockRedstoneWire.isPowerProviderOrWire(
                    blockAccess, par2, par3 - 1, par4 + 1, -1);

    if (!blockAccess.isBlockNormalCube(par2, par3 + 1, par4)) {
      if (blockAccess.isBlockNormalCube(par2 - 1, par3, par4)
          && BlockRedstoneWire.isPowerProviderOrWire(blockAccess, par2 - 1, par3 + 1, par4, -1)) {
        flag = true;
      }

      if (blockAccess.isBlockNormalCube(par2 + 1, par3, par4)
          && BlockRedstoneWire.isPowerProviderOrWire(blockAccess, par2 + 1, par3 + 1, par4, -1)) {
        flag1 = true;
      }

      if (blockAccess.isBlockNormalCube(par2, par3, par4 - 1)
          && BlockRedstoneWire.isPowerProviderOrWire(blockAccess, par2, par3 + 1, par4 - 1, -1)) {
        flag2 = true;
      }

      if (blockAccess.isBlockNormalCube(par2, par3, par4 + 1)
          && BlockRedstoneWire.isPowerProviderOrWire(blockAccess, par2, par3 + 1, par4 + 1, -1)) {
        flag3 = true;
      }
    }

    float f5 = par2 + 0;
    float f6 = par2 + 1;
    float f7 = par4 + 0;
    float f8 = par4 + 1;
    byte byte0 = 0;

    if ((flag || flag1) && !flag2 && !flag3) {
      byte0 = 1;
    }

    if ((flag2 || flag3) && !flag1 && !flag) {
      byte0 = 2;
    }

    if (byte0 == 0) {
      int j = 0;
      int k = 0;
      int l = 16;
      int i1 = 16;

      if (flag1 || flag2 || flag3 || flag) {
        if (!flag) {
          f5 += 0.3125F;
        }

        if (!flag) {
          j += 5;
        }

        if (!flag1) {
          f6 -= 0.3125F;
        }

        if (!flag1) {
          l -= 5;
        }

        if (!flag2) {
          f7 += 0.3125F;
        }

        if (!flag2) {
          k += 5;
        }

        if (!flag3) {
          f8 -= 0.3125F;
        }

        if (!flag3) {
          i1 -= 5;
        }
      }

      tessellator.addVertexWithUV(
          f6, (double) par3 + 0.015625D, f8, icon.getInterpolatedU(l), icon.getInterpolatedV(i1));
      tessellator.addVertexWithUV(
          f6, (double) par3 + 0.015625D, f7, icon.getInterpolatedU(l), icon.getInterpolatedV(k));
      tessellator.addVertexWithUV(
          f5, (double) par3 + 0.015625D, f7, icon.getInterpolatedU(j), icon.getInterpolatedV(k));
      tessellator.addVertexWithUV(
          f5, (double) par3 + 0.015625D, f8, icon.getInterpolatedU(j), icon.getInterpolatedV(i1));
      tessellator.setColorOpaque_F(f, f, f);
      tessellator.addVertexWithUV(
          f6, (double) par3 + 0.015625D, f8, icon2.getInterpolatedU(l), icon2.getInterpolatedV(i1));
      tessellator.addVertexWithUV(
          f6, (double) par3 + 0.015625D, f7, icon2.getInterpolatedU(l), icon2.getInterpolatedV(k));
      tessellator.addVertexWithUV(
          f5, (double) par3 + 0.015625D, f7, icon2.getInterpolatedU(j), icon2.getInterpolatedV(k));
      tessellator.addVertexWithUV(
          f5, (double) par3 + 0.015625D, f8, icon2.getInterpolatedU(j), icon2.getInterpolatedV(i1));
    } else if (byte0 == 1) {
      tessellator.addVertexWithUV(
          f6, (double) par3 + 0.015625D, f8, icon1.getMaxU(), icon1.getMaxV());
      tessellator.addVertexWithUV(
          f6, (double) par3 + 0.015625D, f7, icon1.getMaxU(), icon1.getMinV());
      tessellator.addVertexWithUV(
          f5, (double) par3 + 0.015625D, f7, icon1.getMinU(), icon1.getMinV());
      tessellator.addVertexWithUV(
          f5, (double) par3 + 0.015625D, f8, icon1.getMinU(), icon1.getMaxV());
      tessellator.setColorOpaque_F(f, f, f);
      tessellator.addVertexWithUV(
          f6, (double) par3 + 0.015625D, f8, icon3.getMaxU(), icon3.getMaxV());
      tessellator.addVertexWithUV(
          f6, (double) par3 + 0.015625D, f7, icon3.getMaxU(), icon3.getMinV());
      tessellator.addVertexWithUV(
          f5, (double) par3 + 0.015625D, f7, icon3.getMinU(), icon3.getMinV());
      tessellator.addVertexWithUV(
          f5, (double) par3 + 0.015625D, f8, icon3.getMinU(), icon3.getMaxV());
    } else {
      tessellator.addVertexWithUV(
          f6, (double) par3 + 0.015625D, f8, icon1.getMaxU(), icon1.getMaxV());
      tessellator.addVertexWithUV(
          f6, (double) par3 + 0.015625D, f7, icon1.getMinU(), icon1.getMaxV());
      tessellator.addVertexWithUV(
          f5, (double) par3 + 0.015625D, f7, icon1.getMinU(), icon1.getMinV());
      tessellator.addVertexWithUV(
          f5, (double) par3 + 0.015625D, f8, icon1.getMaxU(), icon1.getMinV());
      tessellator.setColorOpaque_F(f, f, f);
      tessellator.addVertexWithUV(
          f6, (double) par3 + 0.015625D, f8, icon3.getMaxU(), icon3.getMaxV());
      tessellator.addVertexWithUV(
          f6, (double) par3 + 0.015625D, f7, icon3.getMinU(), icon3.getMaxV());
      tessellator.addVertexWithUV(
          f5, (double) par3 + 0.015625D, f7, icon3.getMinU(), icon3.getMinV());
      tessellator.addVertexWithUV(
          f5, (double) par3 + 0.015625D, f8, icon3.getMaxU(), icon3.getMinV());
    }

    if (!blockAccess.isBlockNormalCube(par2, par3 + 1, par4)) {
      if (blockAccess.isBlockNormalCube(par2 - 1, par3, par4)
          && blockAccess.getBlockId(par2 - 1, par3 + 1, par4) == Block.redstoneWire.blockID) {
        tessellator.setColorOpaque_F(f * f2, f * f3, f * f4);
        tessellator.addVertexWithUV(
            (double) par2 + 0.015625D,
            (float) (par3 + 1) + 0.021875F,
            par4 + 1,
            icon1.getMaxU(),
            icon1.getMinV());
        tessellator.addVertexWithUV(
            (double) par2 + 0.015625D, par3 + 0, par4 + 1, icon1.getMinU(), icon1.getMinV());
        tessellator.addVertexWithUV(
            (double) par2 + 0.015625D, par3 + 0, par4 + 0, icon1.getMinU(), icon1.getMaxV());
        tessellator.addVertexWithUV(
            (double) par2 + 0.015625D,
            (float) (par3 + 1) + 0.021875F,
            par4 + 0,
            icon1.getMaxU(),
            icon1.getMaxV());
        tessellator.setColorOpaque_F(f, f, f);
        tessellator.addVertexWithUV(
            (double) par2 + 0.015625D,
            (float) (par3 + 1) + 0.021875F,
            par4 + 1,
            icon3.getMaxU(),
            icon3.getMinV());
        tessellator.addVertexWithUV(
            (double) par2 + 0.015625D, par3 + 0, par4 + 1, icon3.getMinU(), icon3.getMinV());
        tessellator.addVertexWithUV(
            (double) par2 + 0.015625D, par3 + 0, par4 + 0, icon3.getMinU(), icon3.getMaxV());
        tessellator.addVertexWithUV(
            (double) par2 + 0.015625D,
            (float) (par3 + 1) + 0.021875F,
            par4 + 0,
            icon3.getMaxU(),
            icon3.getMaxV());
      }

      if (blockAccess.isBlockNormalCube(par2 + 1, par3, par4)
          && blockAccess.getBlockId(par2 + 1, par3 + 1, par4) == Block.redstoneWire.blockID) {
        tessellator.setColorOpaque_F(f * f2, f * f3, f * f4);
        tessellator.addVertexWithUV(
            (double) (par2 + 1) - 0.015625D, par3 + 0, par4 + 1, icon1.getMinU(), icon1.getMaxV());
        tessellator.addVertexWithUV(
            (double) (par2 + 1) - 0.015625D,
            (float) (par3 + 1) + 0.021875F,
            par4 + 1,
            icon1.getMaxU(),
            icon1.getMaxV());
        tessellator.addVertexWithUV(
            (double) (par2 + 1) - 0.015625D,
            (float) (par3 + 1) + 0.021875F,
            par4 + 0,
            icon1.getMaxU(),
            icon1.getMinV());
        tessellator.addVertexWithUV(
            (double) (par2 + 1) - 0.015625D, par3 + 0, par4 + 0, icon1.getMinU(), icon1.getMinV());
        tessellator.setColorOpaque_F(f, f, f);
        tessellator.addVertexWithUV(
            (double) (par2 + 1) - 0.015625D, par3 + 0, par4 + 1, icon3.getMinU(), icon3.getMaxV());
        tessellator.addVertexWithUV(
            (double) (par2 + 1) - 0.015625D,
            (float) (par3 + 1) + 0.021875F,
            par4 + 1,
            icon3.getMaxU(),
            icon3.getMaxV());
        tessellator.addVertexWithUV(
            (double) (par2 + 1) - 0.015625D,
            (float) (par3 + 1) + 0.021875F,
            par4 + 0,
            icon3.getMaxU(),
            icon3.getMinV());
        tessellator.addVertexWithUV(
            (double) (par2 + 1) - 0.015625D, par3 + 0, par4 + 0, icon3.getMinU(), icon3.getMinV());
      }

      if (blockAccess.isBlockNormalCube(par2, par3, par4 - 1)
          && blockAccess.getBlockId(par2, par3 + 1, par4 - 1) == Block.redstoneWire.blockID) {
        tessellator.setColorOpaque_F(f * f2, f * f3, f * f4);
        tessellator.addVertexWithUV(
            par2 + 1, par3 + 0, (double) par4 + 0.015625D, icon1.getMinU(), icon1.getMaxV());
        tessellator.addVertexWithUV(
            par2 + 1,
            (float) (par3 + 1) + 0.021875F,
            (double) par4 + 0.015625D,
            icon1.getMaxU(),
            icon1.getMaxV());
        tessellator.addVertexWithUV(
            par2 + 0,
            (float) (par3 + 1) + 0.021875F,
            (double) par4 + 0.015625D,
            icon1.getMaxU(),
            icon1.getMinV());
        tessellator.addVertexWithUV(
            par2 + 0, par3 + 0, (double) par4 + 0.015625D, icon1.getMinU(), icon1.getMinV());
        tessellator.setColorOpaque_F(f, f, f);
        tessellator.addVertexWithUV(
            par2 + 1, par3 + 0, (double) par4 + 0.015625D, icon3.getMinU(), icon3.getMaxV());
        tessellator.addVertexWithUV(
            par2 + 1,
            (float) (par3 + 1) + 0.021875F,
            (double) par4 + 0.015625D,
            icon3.getMaxU(),
            icon3.getMaxV());
        tessellator.addVertexWithUV(
            par2 + 0,
            (float) (par3 + 1) + 0.021875F,
            (double) par4 + 0.015625D,
            icon3.getMaxU(),
            icon3.getMinV());
        tessellator.addVertexWithUV(
            par2 + 0, par3 + 0, (double) par4 + 0.015625D, icon3.getMinU(), icon3.getMinV());
      }

      if (blockAccess.isBlockNormalCube(par2, par3, par4 + 1)
          && blockAccess.getBlockId(par2, par3 + 1, par4 + 1) == Block.redstoneWire.blockID) {
        tessellator.setColorOpaque_F(f * f2, f * f3, f * f4);
        tessellator.addVertexWithUV(
            par2 + 1,
            (float) (par3 + 1) + 0.021875F,
            (double) (par4 + 1) - 0.015625D,
            icon1.getMaxU(),
            icon1.getMinV());
        tessellator.addVertexWithUV(
            par2 + 1, par3 + 0, (double) (par4 + 1) - 0.015625D, icon1.getMinU(), icon1.getMinV());
        tessellator.addVertexWithUV(
            par2 + 0, par3 + 0, (double) (par4 + 1) - 0.015625D, icon1.getMinU(), icon1.getMaxV());
        tessellator.addVertexWithUV(
            par2 + 0,
            (float) (par3 + 1) + 0.021875F,
            (double) (par4 + 1) - 0.015625D,
            icon1.getMaxU(),
            icon1.getMaxV());
        tessellator.setColorOpaque_F(f, f, f);
        tessellator.addVertexWithUV(
            par2 + 1,
            (float) (par3 + 1) + 0.021875F,
            (double) (par4 + 1) - 0.015625D,
            icon3.getMaxU(),
            icon3.getMinV());
        tessellator.addVertexWithUV(
            par2 + 1, par3 + 0, (double) (par4 + 1) - 0.015625D, icon3.getMinU(), icon3.getMinV());
        tessellator.addVertexWithUV(
            par2 + 0, par3 + 0, (double) (par4 + 1) - 0.015625D, icon3.getMinU(), icon3.getMaxV());
        tessellator.addVertexWithUV(
            par2 + 0,
            (float) (par3 + 1) + 0.021875F,
            (double) (par4 + 1) - 0.015625D,
            icon3.getMaxU(),
            icon3.getMaxV());
      }
    }

    return true;
  }