Added transposer block for moving items and fluids between adjacent blocks. Closes #1244.

Also refactored fluid stuffs quite a bit; may lead to slight changes in behavior here and there (e.g. returning empty table for tank info instead of "no tank" errors).

src/main/resources/application.conf

@@ -767,6 +767,10 @@ opencomputers {
       # Per-byte cost for ECDSA operation is controlled by `complex` value,
       # because data is hashed with SHA256 before signing/verifying
       dataCardAsymmetric: 10.0
+
+      # Energy required for one transposer operation (regardless of the number
+      # of items / fluid volume moved).
+      transposer: 1
     }
 
     # The rate at which different blocks accept external power. All of these

src/main/resources/assets/opencomputers/doc/en_US/block/transposer.md

@@ -0,0 +1,9 @@
+# Transposer
+
+![Such a poser.](oredict:oc:transposer)
+
+The transposer bridges the gap between redstone controlled hoppers and [robots](robot.md), allowing [computer](../general/computer.md)-controlled transferral of items and fluids between adjacent blocks.
+
+*Note that this block has no internal inventory.*
+
+Besides moving things around, it can also be used to inspect the contents of the adjacent inventories, like an [adapter](adapter.md) with an [inventory controller upgrade](../item/inventoryControllerUpgrade.md) could, and the contents of adjacent tanks, like and adapter with a [tank controller upgrade](../item/tankControllerUpgrade.md) could.

src/main/resources/assets/opencomputers/lang/en_US.lang

@@ -23,6 +23,7 @@ tile.oc.hologram2.name=Hologram Projector (Tier 2)
 tile.oc.keyboard.name=Keyboard
 tile.oc.microcontroller.name=Microcontroller
 tile.oc.motionSensor.name=Motion Sensor
+tile.oc.netSplitter.name=Net Splitter
 tile.oc.powerConverter.name=Power Converter
 tile.oc.powerDistributor.name=Power Distributor
 tile.oc.print.name=3D Print
@@ -37,7 +38,7 @@ tile.oc.screen2.name=Screen (Tier 2)
 tile.oc.screen3.name=Screen (Tier 3)
 tile.oc.serverRack.name=Server Rack
 tile.oc.switch.name=§cSwitch§7
-tile.oc.netSplitter.name=Net Splitter
+tile.oc.transposer.name=Transposer
 tile.oc.waypoint.name=Waypoint
 
 # Items
@@ -348,6 +349,7 @@ oc:tooltip.Tier=§8Tier %s
 oc:tooltip.NetSplitter=Acts as a dynamic connector. Connectivity of each side can be toggled by hitting it with a wrench. Connectivity of all sides can be inverted by applying a redstone signal.
 oc:tooltip.TooLong=Hold [§f%s§7] for a detailed tooltip.
 oc:tooltip.Transistor=A basic element in most other computer parts. It's a bit twisted, but it does the job.
+oc:tooltip.Transposer=Allows automated transferral of items and fluids between adjacent inventories and fluid containers.
 oc:tooltip.UpgradeAngel=Allows robots to place blocks in thin air, even if there is no point of reference.
 oc:tooltip.UpgradeBattery=Increase the amount of energy a device can store, allowing it work longer without having to be recharged. [nl] Capacity: §f%s§7
 oc:tooltip.UpgradeChunkloader=If a robot moves in a forest and no one is around to see it, does it really move? This upgrades makes sure it does. It keeps the chunk a device is in loaded, but continually consumes energy while active.

src/main/resources/assets/opencomputers/recipes/default.recipes

@@ -634,6 +634,12 @@ screen3 {
           [yellowDust, "oc:circuitChip3", glass]
           [obsidian, yellowDust, obsidian]]
 }
+transposer {
+  input: [[ingotIron, "oc:inventoryControllerUpgrade", ingotIron]
+          [hopper, bucket, hopper]
+          [ingotIron, "oc:tankControllerUpgrade", ingotIron]]
+  output: 4
+}
 waypoint {
   input: [[ingotIron, "oc:circuitChip1", ingotIron]
           ["oc:materialTransistor", "oc:materialInterweb", "oc:materialTransistor"],

src/main/scala/li/cil/oc/Constants.scala

@@ -25,6 +25,7 @@ object Constants {
     final val Keyboard = "keyboard"
     final val Microcontroller = "microcontroller"
     final val MotionSensor = "motionSensor"
+    final val NetSplitter = "netSplitter"
     final val PowerConverter = "powerConverter"
     final val PowerDistributor = "powerDistributor"
     final val Print = "print"
@@ -39,7 +40,7 @@ object Constants {
     final val ScreenTier3 = "screen3"
     final val ServerRack = "serverRack"
     final val Switch = "switch"
-    final val NetSplitter = "netSplitter"
+    final val Transposer = "transposer"
     final val Waypoint = "waypoint"
 
     def Case(tier: Int) = ItemUtils.caseNameWithTierSuffix("case", tier)

src/main/scala/li/cil/oc/Settings.scala

@@ -201,6 +201,7 @@ class Settings(val config: Config) {
   val dataCardComplex = config.getDouble("power.cost.dataCardComplex") max 0
   val dataCardComplexByte = config.getDouble("power.cost.dataCardComplexByte") max 0
   val dataCardAsymmetric = config.getDouble("power.cost.dataCardAsymmetric") max 0
+  val transposerCost = config.getDouble("power.cost.transposer") max 0
 
   // power.rate
   val accessPointRate = config.getDouble("power.rate.accessPoint") max 0

src/main/scala/li/cil/oc/client/PacketHandler.scala

@@ -9,11 +9,11 @@ import li.cil.oc.Settings
 import li.cil.oc.api.component
 import li.cil.oc.api.event.FileSystemAccessEvent
 import li.cil.oc.client.renderer.PetRenderer
+import li.cil.oc.common.Loot
 import li.cil.oc.common.PacketType
 import li.cil.oc.common.container
 import li.cil.oc.common.tileentity._
 import li.cil.oc.common.tileentity.traits._
-import li.cil.oc.common.Loot
 import li.cil.oc.common.{PacketHandler => CommonPacketHandler}
 import li.cil.oc.util.Audio
 import li.cil.oc.util.ExtendedWorld._
@@ -79,6 +79,7 @@ object PacketHandler extends CommonPacketHandler {
       case PacketType.ServerPresence => onServerPresence(p)
       case PacketType.Sound => onSound(p)
       case PacketType.SoundPattern => onSoundPattern(p)
+      case PacketType.TransposerActivity => onTransposerActivity(p)
       case PacketType.WaypointLabel => onWaypointLabel(p)
       case _ => // Invalid packet.
     }
@@ -263,6 +264,15 @@ object PacketHandler extends CommonPacketHandler {
     }
   }
 
+  def onNetSplitterState(p: PacketParser) =
+    p.readTileEntity[NetSplitter]() match {
+      case Some(t) =>
+        t.isInverted = p.readBoolean()
+        t.openSides = t.uncompressSides(p.readByte())
+        t.world.markBlockForUpdate(t.x, t.y, t.z)
+      case _ => // Invalid packet.
+    }
+
   def onParticleEffect(p: PacketParser) = {
     val dimension = p.readInt()
     world(p.player, dimension) match {
@@ -592,15 +602,6 @@ object PacketHandler extends CommonPacketHandler {
     buffer.rawSetForeground(col, row, color)
   }
 
-  def onNetSplitterState(p: PacketParser) =
-    p.readTileEntity[NetSplitter]() match {
-      case Some(t) =>
-        t.isInverted = p.readBoolean()
-        t.openSides = t.uncompressSides(p.readByte())
-        t.world.markBlockForUpdate(t.x, t.y, t.z)
-      case _ => // Invalid packet.
-    }
-
   def onScreenTouchMode(p: PacketParser) =
     p.readTileEntity[Screen]() match {
       case Some(t) => t.invertTouchMode = p.readBoolean()
@@ -641,6 +642,12 @@ object PacketHandler extends CommonPacketHandler {
     }
   }
 
+  def onTransposerActivity(p: PacketParser) =
+    p.readTileEntity[Transposer]() match {
+      case Some(transposer) => transposer.lastOperation = System.currentTimeMillis()
+      case _ => // Invalid packet.
+    }
+
   def onWaypointLabel(p: PacketParser) =
     p.readTileEntity[Waypoint]() match {
       case Some(waypoint) => waypoint.label = p.readUTF()

src/main/scala/li/cil/oc/client/Proxy.scala

@@ -61,6 +61,7 @@ private[oc] class Proxy extends CommonProxy {
     else
       ClientRegistry.bindTileEntitySpecialRenderer(classOf[tileentity.Hologram], HologramRendererFallback)
     ClientRegistry.bindTileEntitySpecialRenderer(classOf[tileentity.Microcontroller], MicrocontrollerRenderer)
+    ClientRegistry.bindTileEntitySpecialRenderer(classOf[tileentity.NetSplitter], NetSplitterRenderer)
     ClientRegistry.bindTileEntitySpecialRenderer(classOf[tileentity.PowerDistributor], PowerDistributorRenderer)
     ClientRegistry.bindTileEntitySpecialRenderer(classOf[tileentity.Printer], PrinterRenderer)
     ClientRegistry.bindTileEntitySpecialRenderer(classOf[tileentity.Raid], RaidRenderer)
@@ -70,7 +71,7 @@ private[oc] class Proxy extends CommonProxy {
     ClientRegistry.bindTileEntitySpecialRenderer(classOf[tileentity.Relay], SwitchRenderer)
     ClientRegistry.bindTileEntitySpecialRenderer(classOf[tileentity.RobotProxy], RobotRenderer)
     ClientRegistry.bindTileEntitySpecialRenderer(classOf[tileentity.Screen], ScreenRenderer)
-    ClientRegistry.bindTileEntitySpecialRenderer(classOf[tileentity.NetSplitter], NetSplitterRenderer)
+    ClientRegistry.bindTileEntitySpecialRenderer(classOf[tileentity.Transposer], TransposerRenderer)
 
     MinecraftForgeClient.registerItemRenderer(Items.get(Constants.ItemName.Floppy).createItemStack(1).getItem, ItemRenderer)
     MinecraftForgeClient.registerItemRenderer(Items.get(Constants.BlockName.Print).createItemStack(1).getItem, ItemRenderer)

src/main/scala/li/cil/oc/client/Textures.scala

@@ -104,6 +104,10 @@ object Textures {
     var iconOn: IIcon = _
   }
 
+  object Transposer {
+    var iconOn: IIcon = _
+  }
+
   def init(tm: TextureManager) {
     tm.bindTexture(fontAntiAliased)
     tm.bindTexture(fontAliased)

src/main/scala/li/cil/oc/client/renderer/block/BlockRenderer.scala

@@ -67,6 +67,13 @@ object BlockRenderer extends ISimpleBlockRenderingHandler {
         Tessellator.instance.draw()
 
         RenderState.checkError(getClass.getName + ".renderInventoryBlock: splitter")
+      case _: Transposer =>
+        GL11.glTranslatef(-0.5f, -0.5f, -0.5f)
+        Tessellator.instance.startDrawingQuads()
+        Transposer.render(block, metadata, renderer)
+        Tessellator.instance.draw()
+
+        RenderState.checkError(getClass.getName + ".renderInventoryBlock: transposer")
       case _ =>
         block match {
           case simple: SimpleBlock =>
@@ -103,7 +110,7 @@ object BlockRenderer extends ISimpleBlockRenderingHandler {
         RenderState.checkError(getClass.getName + ".renderWorldBlock: assembler")
 
         true
-      case cable: tileentity.Cable =>
+      case _: tileentity.Cable =>
         Cable.render(world, x, y, z, block, renderer)
 
         RenderState.checkError(getClass.getName + ".renderWorldBlock: cable")
@@ -127,7 +134,7 @@ object BlockRenderer extends ISimpleBlockRenderingHandler {
         RenderState.checkError(getClass.getName + ".renderWorldBlock: print")
 
         true
-      case printer: tileentity.Printer =>
+      case _: tileentity.Printer =>
         Printer.render(block, x, y, z, renderer)
 
         RenderState.checkError(getClass.getName + ".renderWorldBlock: printer")
@@ -144,6 +151,12 @@ object BlockRenderer extends ISimpleBlockRenderingHandler {
 
         RenderState.checkError(getClass.getName + ".renderWorldBlock: splitter")
 
+        true
+      case _: tileentity.Transposer =>
+        Transposer.render(block, x, y, z, renderer)
+
+        RenderState.checkError(getClass.getName + ".renderWorldBlock: transposer")
+
         true
       case _ =>
         val result = renderer.renderStandardBlock(block, x, y, z)
@@ -158,7 +171,8 @@ object BlockRenderer extends ISimpleBlockRenderingHandler {
     block.isInstanceOf[Hologram] ||
       block.isInstanceOf[Printer] ||
       block.isInstanceOf[Print] ||
-      block.isInstanceOf[NetSplitter]
+      block.isInstanceOf[NetSplitter] ||
+      block.isInstanceOf[Transposer]
 
   // The texture flip this works around only seems to occur for blocks with custom block renderers?
   def patchedRenderer(renderer: RenderBlocks, block: Block) =

src/main/scala/li/cil/oc/client/renderer/block/Transposer.scala

@@ -0,0 +1,124 @@
+package li.cil.oc.client.renderer.block
+
+import net.minecraft.block.Block
+import net.minecraft.client.renderer.RenderBlocks
+
+object Transposer {
+  def render(block: Block, x: Int, y: Int, z: Int, renderer: RenderBlocks) {
+    val previousRenderAllFaces = renderer.renderAllFaces
+    renderer.renderAllFaces = true
+
+    // Corners.
+    renderer.setRenderBounds(0 / 16f, 0 / 16f, 0 / 16f, 7 / 16f, 7 / 16f, 7 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(0 / 16f, 0 / 16f, 9 / 16f, 7 / 16f, 7 / 16f, 16 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(0 / 16f, 9 / 16f, 0 / 16f, 7 / 16f, 16 / 16f, 7 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(0 / 16f, 9 / 16f, 9 / 16f, 7 / 16f, 16 / 16f, 16 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(9 / 16f, 0 / 16f, 0 / 16f, 16 / 16f, 7 / 16f, 7 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(9 / 16f, 0 / 16f, 9 / 16f, 16 / 16f, 7 / 16f, 16 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(9 / 16f, 9 / 16f, 0 / 16f, 16 / 16f, 16 / 16f, 7 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(9 / 16f, 9 / 16f, 9 / 16f, 16 / 16f, 16 / 16f, 16 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+
+    // Gaps.
+    renderer.setRenderBounds(0 / 16f, 0 / 16f, 7 / 16f, 5 / 16f, 5 / 16f, 9 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(0 / 16f, 11 / 16f, 7 / 16f, 5 / 16f, 16 / 16f, 9 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(11 / 16f, 0 / 16f, 7 / 16f, 16 / 16f, 5 / 16f, 9 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(11 / 16f, 11 / 16f, 7 / 16f, 16 / 16f, 16 / 16f, 9 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+
+    renderer.setRenderBounds(0 / 16f, 7 / 16f, 0 / 16f, 5 / 16f, 9 / 16f, 5 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(0 / 16f, 7 / 16f, 11 / 16f, 5 / 16f, 9 / 16f, 16 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(11 / 16f, 7 / 16f, 0 / 16f, 16 / 16f, 9 / 16f, 5 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(11 / 16f, 7 / 16f, 11 / 16f, 16 / 16f, 9 / 16f, 16 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+
+    renderer.setRenderBounds(7 / 16f, 0 / 16f, 0 / 16f, 9 / 16f, 5 / 16f, 5 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(7 / 16f, 0 / 16f, 11 / 16f, 9 / 16f, 5 / 16f, 16 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(7 / 16f, 11 / 16f, 0 / 16f, 9 / 16f, 16 / 16f, 5 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+    renderer.setRenderBounds(7 / 16f, 11 / 16f, 11 / 16f, 9 / 16f, 16 / 16f, 16 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+
+    // Core.
+    renderer.setRenderBounds(1 / 16f, 1 / 16f, 1 / 16f, 15 / 16f, 15 / 16f, 15 / 16f)
+    renderer.renderStandardBlock(block, x, y, z)
+
+    renderer.renderAllFaces = previousRenderAllFaces
+  }
+
+  def render(block: Block, metadata: Int, renderer: RenderBlocks) {
+    // Corners.
+    renderer.setRenderBounds(0 / 16f, 0 / 16f, 0 / 16f, 7 / 16f, 7 / 16f, 7 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(0 / 16f, 0 / 16f, 9 / 16f, 7 / 16f, 7 / 16f, 16 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(0 / 16f, 9 / 16f, 0 / 16f, 7 / 16f, 16 / 16f, 7 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(0 / 16f, 9 / 16f, 9 / 16f, 7 / 16f, 16 / 16f, 16 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(9 / 16f, 0 / 16f, 0 / 16f, 16 / 16f, 7 / 16f, 7 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(9 / 16f, 0 / 16f, 9 / 16f, 16 / 16f, 7 / 16f, 16 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(9 / 16f, 9 / 16f, 0 / 16f, 16 / 16f, 16 / 16f, 7 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(9 / 16f, 9 / 16f, 9 / 16f, 16 / 16f, 16 / 16f, 16 / 16f)
+    renderAllFaces(block, metadata, renderer)
+
+    // Gaps.
+    renderer.setRenderBounds(0 / 16f, 0 / 16f, 7 / 16f, 5 / 16f, 5 / 16f, 9 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(0 / 16f, 11 / 16f, 7 / 16f, 5 / 16f, 16 / 16f, 9 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(11 / 16f, 0 / 16f, 7 / 16f, 16 / 16f, 5 / 16f, 9 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(11 / 16f, 11 / 16f, 7 / 16f, 16 / 16f, 16 / 16f, 9 / 16f)
+    renderAllFaces(block, metadata, renderer)
+
+    renderer.setRenderBounds(0 / 16f, 7 / 16f, 0 / 16f, 5 / 16f, 9 / 16f, 5 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(0 / 16f, 7 / 16f, 11 / 16f, 5 / 16f, 9 / 16f, 16 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(11 / 16f, 7 / 16f, 0 / 16f, 16 / 16f, 9 / 16f, 5 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(11 / 16f, 7 / 16f, 11 / 16f, 16 / 16f, 9 / 16f, 16 / 16f)
+    renderAllFaces(block, metadata, renderer)
+
+    renderer.setRenderBounds(7 / 16f, 0 / 16f, 0 / 16f, 9 / 16f, 5 / 16f, 5 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(7 / 16f, 0 / 16f, 11 / 16f, 9 / 16f, 5 / 16f, 16 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(7 / 16f, 11 / 16f, 0 / 16f, 9 / 16f, 16 / 16f, 5 / 16f)
+    renderAllFaces(block, metadata, renderer)
+    renderer.setRenderBounds(7 / 16f, 11 / 16f, 11 / 16f, 9 / 16f, 16 / 16f, 16 / 16f)
+    renderAllFaces(block, metadata, renderer)
+
+    // Core.
+    renderer.setRenderBounds(1 / 16f, 1 / 16f, 1 / 16f, 15 / 16f, 15 / 16f, 15 / 16f)
+    renderAllFaces(block, metadata, renderer)
+  }
+
+  private def renderAllFaces(block: Block, metadata: Int, renderer: RenderBlocks): Unit = {
+    BlockRenderer.renderFaceYPos(block, metadata, renderer)
+    BlockRenderer.renderFaceYNeg(block, metadata, renderer)
+    BlockRenderer.renderFaceXPos(block, metadata, renderer)
+    BlockRenderer.renderFaceXNeg(block, metadata, renderer)
+    BlockRenderer.renderFaceZPos(block, metadata, renderer)
+    BlockRenderer.renderFaceZNeg(block, metadata, renderer)
+  }
+}

src/main/scala/li/cil/oc/client/renderer/tileentity/TransposerRenderer.scala

@@ -0,0 +1,77 @@
+package li.cil.oc.client.renderer.tileentity
+
+import li.cil.oc.client.Textures
+import li.cil.oc.common.tileentity
+import li.cil.oc.util.RenderState
+import net.minecraft.client.renderer.Tessellator
+import net.minecraft.client.renderer.texture.TextureMap
+import net.minecraft.client.renderer.tileentity.TileEntitySpecialRenderer
+import net.minecraft.tileentity.TileEntity
+import org.lwjgl.opengl.GL11
+
+object TransposerRenderer extends TileEntitySpecialRenderer {
+  override def renderTileEntityAt(tileEntity: TileEntity, x: Double, y: Double, z: Double, f: Float) {
+    RenderState.checkError(getClass.getName + ".renderTileEntityAt: entering (aka: wasntme)")
+
+    val transposer = tileEntity.asInstanceOf[tileentity.Transposer]
+    val activity = math.max(0, 1 - (System.currentTimeMillis() - transposer.lastOperation) / 1000.0)
+    if (activity > 0) {
+      GL11.glPushAttrib(GL11.GL_ALL_ATTRIB_BITS)
+
+      RenderState.disableLighting()
+      RenderState.makeItBlend()
+      RenderState.setBlendAlpha(activity.toFloat)
+
+      GL11.glPushMatrix()
+
+      GL11.glTranslated(x + 0.5, y + 0.5, z + 0.5)
+      GL11.glScaled(1.0025, -1.0025, 1.0025)
+      GL11.glTranslatef(-0.5f, -0.5f, -0.5f)
+
+      bindTexture(TextureMap.locationBlocksTexture)
+      val t = Tessellator.instance
+      t.startDrawingQuads()
+
+      val icon = Textures.Transposer.iconOn
+
+      t.addVertexWithUV(0, 1, 0, icon.getMaxU, icon.getMinV)
+      t.addVertexWithUV(1, 1, 0, icon.getMinU, icon.getMinV)
+      t.addVertexWithUV(1, 1, 1, icon.getMinU, icon.getMaxV)
+      t.addVertexWithUV(0, 1, 1, icon.getMaxU, icon.getMaxV)
+
+      t.addVertexWithUV(0, 0, 0, icon.getMaxU, icon.getMaxV)
+      t.addVertexWithUV(0, 0, 1, icon.getMaxU, icon.getMinV)
+      t.addVertexWithUV(1, 0, 1, icon.getMinU, icon.getMinV)
+      t.addVertexWithUV(1, 0, 0, icon.getMinU, icon.getMaxV)
+
+      t.addVertexWithUV(1, 1, 0, icon.getMinU, icon.getMaxV)
+      t.addVertexWithUV(0, 1, 0, icon.getMaxU, icon.getMaxV)
+      t.addVertexWithUV(0, 0, 0, icon.getMaxU, icon.getMinV)
+      t.addVertexWithUV(1, 0, 0, icon.getMinU, icon.getMinV)
+
+      t.addVertexWithUV(0, 1, 1, icon.getMinU, icon.getMaxV)
+      t.addVertexWithUV(1, 1, 1, icon.getMaxU, icon.getMaxV)
+      t.addVertexWithUV(1, 0, 1, icon.getMaxU, icon.getMinV)
+      t.addVertexWithUV(0, 0, 1, icon.getMinU, icon.getMinV)
+
+      t.addVertexWithUV(0, 1, 0, icon.getMinU, icon.getMaxV)
+      t.addVertexWithUV(0, 1, 1, icon.getMaxU, icon.getMaxV)
+      t.addVertexWithUV(0, 0, 1, icon.getMaxU, icon.getMinV)
+      t.addVertexWithUV(0, 0, 0, icon.getMinU, icon.getMinV)
+
+      t.addVertexWithUV(1, 1, 1, icon.getMinU, icon.getMaxV)
+      t.addVertexWithUV(1, 1, 0, icon.getMaxU, icon.getMaxV)
+      t.addVertexWithUV(1, 0, 0, icon.getMaxU, icon.getMinV)
+      t.addVertexWithUV(1, 0, 1, icon.getMinU, icon.getMinV)
+
+      t.draw()
+
+      RenderState.enableLighting()
+
+      GL11.glPopMatrix()
+      GL11.glPopAttrib()
+    }
+
+    RenderState.checkError(getClass.getName + ".renderTileEntityAt: leaving")
+  }
+}

src/main/scala/li/cil/oc/common/PacketType.scala

@@ -21,6 +21,7 @@ object PacketType extends Enumeration {
   HologramTranslation,
   HologramValues,
   LootDisk,
+  NetSplitterState,
   ParticleEffect,
   PetVisibility, // Goes both ways.
   PowerState,
@@ -50,11 +51,11 @@ object PacketType extends Enumeration {
   TextBufferMultiRawSetBackground,
   TextBufferMultiRawSetForeground,
   TextBufferPowerChange,
-  NetSplitterState,
   ScreenTouchMode,
   ServerPresence,
   Sound,
   SoundPattern,
+  TransposerActivity,
   WaypointLabel, // Goes both ways.
 
   // Client -> Server

src/main/scala/li/cil/oc/common/block/Geolyzer.scala

@@ -1,5 +1,7 @@
 package li.cil.oc.common.block
 
+import cpw.mods.fml.relauncher.Side
+import cpw.mods.fml.relauncher.SideOnly
 import li.cil.oc.Settings
 import li.cil.oc.client.Textures
 import li.cil.oc.common.tileentity
@@ -19,6 +21,7 @@ class Geolyzer extends SimpleBlock {
     Some("GeolyzerSide")
   )
 
+  @SideOnly(Side.CLIENT)
   override def registerBlockIcons(iconRegister: IIconRegister) = {
     super.registerBlockIcons(iconRegister)
     Textures.Geolyzer.iconTopOn = iconRegister.registerIcon(Settings.resourceDomain + ":GeolyzerTopOn")

src/main/scala/li/cil/oc/common/block/NetSplitter.scala

@@ -23,8 +23,8 @@ class NetSplitter extends RedstoneAware {
     Some("NetSplitterSide")
   )
 
-  @SideOnly(Side.CLIENT) override
+  @SideOnly(Side.CLIENT)
-  def registerBlockIcons(iconRegister: IIconRegister): Unit = {
+  override def registerBlockIcons(iconRegister: IIconRegister): Unit = {
     super.registerBlockIcons(iconRegister)
     Textures.NetSplitter.iconOn = iconRegister.registerIcon(Settings.resourceDomain + ":NetSplitterOn")
   }

src/main/scala/li/cil/oc/common/block/Transposer.scala

@@ -0,0 +1,36 @@
+package li.cil.oc.common.block
+
+import cpw.mods.fml.relauncher.Side
+import cpw.mods.fml.relauncher.SideOnly
+import li.cil.oc.Settings
+import li.cil.oc.client.Textures
+import li.cil.oc.common.tileentity
+import net.minecraft.client.renderer.texture.IIconRegister
+import net.minecraft.world.IBlockAccess
+import net.minecraft.world.World
+import net.minecraftforge.common.util.ForgeDirection
+
+class Transposer extends SimpleBlock {
+  override protected def customTextures = Array(
+    Some("TransposerTop"),
+    Some("TransposerTop"),
+    Some("TransposerSide"),
+    Some("TransposerSide"),
+    Some("TransposerSide"),
+    Some("TransposerSide")
+  )
+
+  @SideOnly(Side.CLIENT)
+  override def registerBlockIcons(iconRegister: IIconRegister): Unit = {
+    super.registerBlockIcons(iconRegister)
+    Textures.Transposer.iconOn = iconRegister.registerIcon(Settings.resourceDomain + ":TransposerOn")
+  }
+
+  override def isSideSolid(world: IBlockAccess, x: Int, y: Int, z: Int, side: ForgeDirection): Boolean = false
+
+  // ----------------------------------------------------------------------- //
+
+  override def hasTileEntity(metadata: Int) = true
+
+  override def createTileEntity(world: World, metadata: Int) = new tileentity.Transposer()
+}

src/main/scala/li/cil/oc/common/init/Blocks.scala

@@ -24,6 +24,7 @@ object Blocks {
     GameRegistry.registerTileEntity(classOf[tileentity.Geolyzer], Settings.namespace + "geolyzer")
     GameRegistry.registerTileEntity(classOf[tileentity.Microcontroller], Settings.namespace + "microcontroller")
     GameRegistry.registerTileEntity(classOf[tileentity.MotionSensor], Settings.namespace + "motion_sensor")
+    GameRegistry.registerTileEntity(classOf[tileentity.NetSplitter], Settings.namespace + "netSplitter")
     GameRegistry.registerTileEntity(classOf[tileentity.PowerConverter], Settings.namespace + "power_converter")
     GameRegistry.registerTileEntity(classOf[tileentity.PowerDistributor], Settings.namespace + "power_distributor")
     GameRegistry.registerTileEntity(classOf[tileentity.Print], Settings.namespace + "print")
@@ -35,7 +36,7 @@ object Blocks {
     GameRegistry.registerTileEntity(classOf[tileentity.Switch], Settings.namespace + "switch")
     GameRegistry.registerTileEntity(classOf[tileentity.Screen], Settings.namespace + "screen")
     GameRegistry.registerTileEntity(classOf[tileentity.ServerRack], Settings.namespace + "serverRack")
-    GameRegistry.registerTileEntity(classOf[tileentity.NetSplitter], Settings.namespace + "netSplitter")
+    GameRegistry.registerTileEntity(classOf[tileentity.Transposer], Settings.namespace + "transposer")
     GameRegistry.registerTileEntity(classOf[tileentity.Waypoint], Settings.namespace + "waypoint")
 
     Items.registerBlock(new AccessPoint(), Constants.BlockName.AccessPoint)
@@ -81,5 +82,8 @@ object Blocks {
 
     // v1.5.14
     Recipes.addBlock(new NetSplitter(), Constants.BlockName.NetSplitter, "oc:netSplitter")
+
+    // v1.5.16
+    Recipes.addBlock(new Transposer(), Constants.BlockName.Transposer, "oc:transposer")
   }
 }

src/main/scala/li/cil/oc/common/tileentity/Transposer.scala

@@ -0,0 +1,25 @@
+package li.cil.oc.common.tileentity
+
+import li.cil.oc.server.component
+import net.minecraft.nbt.NBTTagCompound
+
+class Transposer extends traits.Environment {
+  val transposer = new component.Transposer(this)
+
+  def node = transposer.node
+
+  // Used on client side to check whether to render activity indicators.
+  var lastOperation = 0L
+
+  override def canUpdate = false
+
+  override def readFromNBTForServer(nbt: NBTTagCompound) {
+    super.readFromNBTForServer(nbt)
+    transposer.load(nbt)
+  }
+
+  override def writeToNBTForServer(nbt: NBTTagCompound) {
+    super.writeToNBTForServer(nbt)
+    transposer.save(nbt)
+  }
+}

src/main/scala/li/cil/oc/server/PacketSender.scala

@@ -234,6 +234,16 @@ object PacketSender {
     }
   }
 
+  def sendNetSplitterState(t: tileentity.NetSplitter): Unit = {
+    val pb = new SimplePacketBuilder(PacketType.NetSplitterState)
+
+    pb.writeTileEntity(t)
+    pb.writeBoolean(t.isInverted)
+    pb.writeByte(t.compressSides)
+
+    pb.sendToPlayersNearTileEntity(t)
+  }
+
   def sendParticleEffect(position: BlockPosition, name: String, count: Int, velocity: Double, direction: Option[ForgeDirection] = None): Unit = if (count > 0) {
     val pb = new SimplePacketBuilder(PacketType.ParticleEffect)
 
@@ -529,16 +539,6 @@ object PacketSender {
     pb.sendToPlayersNearHost(host)
   }
 
-  def sendNetSplitterState(t: tileentity.NetSplitter): Unit = {
-    val pb = new SimplePacketBuilder(PacketType.NetSplitterState)
-
-    pb.writeTileEntity(t)
-    pb.writeBoolean(t.isInverted)
-    pb.writeByte(t.compressSides)
-
-    pb.sendToPlayersNearTileEntity(t)
-  }
-
   def sendScreenTouchMode(t: tileentity.Screen, value: Boolean) {
     val pb = new SimplePacketBuilder(PacketType.ScreenTouchMode)
 
@@ -619,6 +619,14 @@ object PacketSender {
     pb.sendToNearbyPlayers(world, x, y, z, Option(32))
   }
 
+  def sendTransposerActivity(t: tileentity.Transposer) {
+    val pb = new SimplePacketBuilder(PacketType.TransposerActivity)
+
+    pb.writeTileEntity(t)
+
+    pb.sendToPlayersNearTileEntity(t, Option(32))
+  }
+
   def sendWaypointLabel(t: Waypoint): Unit = {
     val pb = new SimplePacketBuilder(PacketType.WaypointLabel)
 

src/main/scala/li/cil/oc/server/component/Transposer.scala

@@ -0,0 +1,68 @@
+package li.cil.oc.server.component
+
+import li.cil.oc.Settings
+import li.cil.oc.api
+import li.cil.oc.api.machine.Arguments
+import li.cil.oc.api.machine.Callback
+import li.cil.oc.api.machine.Context
+import li.cil.oc.api.network.Visibility
+import li.cil.oc.api.prefab
+import li.cil.oc.common.tileentity
+import li.cil.oc.server.{PacketSender => ServerPacketSender}
+import li.cil.oc.util.BlockPosition
+import li.cil.oc.util.ExtendedArguments._
+import li.cil.oc.util.FluidUtils
+import li.cil.oc.util.InventoryUtils
+import net.minecraftforge.common.util.ForgeDirection
+
+import scala.language.existentials
+
+class Transposer(val host: tileentity.Transposer) extends prefab.ManagedEnvironment with traits.WorldInventoryAnalytics with traits.WorldTankAnalytics {
+  override val node = api.Network.newNode(this, Visibility.Network).
+    withComponent("transposer").
+    withConnector().
+    create()
+
+  override def position = BlockPosition(host)
+
+  override protected def checkSideForAction(args: Arguments, n: Int) =
+    args.checkSide(n, ForgeDirection.VALID_DIRECTIONS: _*)
+
+  @Callback(doc = """function(sourceSide:number, sinkSide:number[, count:number[, sourceSlot:number, sinkSlot:number]]):number -- Transfer some items between two inventories.""")
+  def transferItem(context: Context, args: Arguments): Array[AnyRef] = {
+    val sourceSide = checkSideForAction(args, 0)
+    val sourcePos = position.offset(sourceSide)
+    val sinkSide = checkSideForAction(args, 1)
+    val sinkPos = position.offset(sinkSide)
+    val count = args.optItemCount(2)
+
+    if (node.tryChangeBuffer(-Settings.get.transposerCost)) {
+      ServerPacketSender.sendTransposerActivity(host)
+
+      if (args.count > 3) {
+        val sourceSlot = args.checkSlot(InventoryUtils.inventoryAt(sourcePos).getOrElse(throw new IllegalArgumentException("no inventory")), 3)
+        val sinkSlot = args.checkSlot(InventoryUtils.inventoryAt(sinkPos).getOrElse(throw new IllegalArgumentException("no inventory")), 4)
+
+        result(InventoryUtils.transferBetweenInventoriesSlotsAt(sourcePos, sourceSide.getOpposite, sourceSlot, sinkPos, Option(sinkSide.getOpposite), sinkSlot, count))
+      }
+      else result(InventoryUtils.transferBetweenInventoriesAt(sourcePos, sourceSide.getOpposite, sinkPos, Option(sinkSide.getOpposite), count))
+    }
+    else result(Unit, "not enough energy")
+  }
+
+  @Callback(doc = """function(sourceSide:number, sinkSide:number[, count:number]):number -- Transfer some items between two inventories.""")
+  def transferFluid(context: Context, args: Arguments): Array[AnyRef] = {
+    val sourceSide = checkSideForAction(args, 0)
+    val sourcePos = position.offset(sourceSide)
+    val sinkSide = checkSideForAction(args, 1)
+    val sinkPos = position.offset(sinkSide)
+    val count = args.optFluidCount(2)
+
+    if (node.tryChangeBuffer(-Settings.get.transposerCost)) {
+      ServerPacketSender.sendTransposerActivity(host)
+
+      result(FluidUtils.transferBetweenFluidHandlersAt(sourcePos, sourceSide.getOpposite, sinkPos, sinkSide.getOpposite, count))
+    }
+    else result(Unit, "not enough energy")
+  }
+}

src/main/scala/li/cil/oc/server/component/traits/TankWorldControl.scala

@@ -4,14 +4,9 @@ import li.cil.oc.api.machine.Arguments
 import li.cil.oc.api.machine.Callback
 import li.cil.oc.api.machine.Context
 import li.cil.oc.util.ExtendedArguments._
-import li.cil.oc.util.ExtendedBlock._
+import li.cil.oc.util.FluidUtils
-import li.cil.oc.util.ExtendedWorld._
 import li.cil.oc.util.ResultWrapper.result
-import net.minecraft.block.BlockLiquid
-import net.minecraftforge.fluids.FluidRegistry
 import net.minecraftforge.fluids.FluidStack
-import net.minecraftforge.fluids.IFluidBlock
-import net.minecraftforge.fluids.IFluidHandler
 
 trait TankWorldControl extends TankAware with WorldAware with SideRestricted {
   @Callback(doc = "function(side:number):boolean -- Compare the fluid in the selected tank with the fluid on the specified side. Returns true if equal.")
@@ -19,16 +14,10 @@ trait TankWorldControl extends TankAware with WorldAware with SideRestricted {
     val side = checkSideForAction(args, 0)
     fluidInTank(selectedTank) match {
       case Some(stack) =>
-        val blockPos = position.offset(side)
+        FluidUtils.fluidHandlerAt(position.offset(side)) match {
-        if (world.blockExists(blockPos)) world.getTileEntity(blockPos) match {
+          case Some(handler) => result(Option(handler.getTankInfo(side.getOpposite)).exists(_.exists(other => stack.isFluidEqual(other.fluid))))
-          case handler: IFluidHandler =>
+          case _ => result(false)
-            result(Option(handler.getTankInfo(side.getOpposite)).exists(_.exists(other => stack.isFluidEqual(other.fluid))))
-          case _ =>
-            val block = world.getBlock(blockPos)
-            val fluid = FluidRegistry.lookupFluidForBlock(block)
-            result(stack.getFluid == fluid)
         }
-        else result(false)
       case _ => result(false)
     }
   }
@@ -36,18 +25,14 @@ trait TankWorldControl extends TankAware with WorldAware with SideRestricted {
   @Callback(doc = "function(side:boolean[, amount:number=1000]):boolean, number or string -- Drains the specified amount of fluid from the specified side. Returns the amount drained, or an error message.")
   def drain(context: Context, args: Arguments): Array[AnyRef] = {
     val facing = checkSideForAction(args, 0)
-    val count = args.optFluidCount(1)
+    val count = args.optFluidCount(1) max 0
     getTank(selectedTank) match {
       case Some(tank) =>
         val space = tank.getCapacity - tank.getFluidAmount
         val amount = math.min(count, space)
-        if (count > 0 && amount == 0) {
+        if (count < 1 || amount > 0) {
-          result(Unit, "tank is full")
+          FluidUtils.fluidHandlerAt(position.offset(facing)) match {
-        }
+            case Some(handler) =>
-        else {
-          val blockPos = position.offset(facing)
-          if (world.blockExists(blockPos)) world.getTileEntity(blockPos) match {
-            case handler: IFluidHandler =>
               tank.getFluid match {
                 case stack: FluidStack =>
                   val drained = handler.drain(facing.getOpposite, new FluidStack(stack, amount), true)
@@ -60,36 +45,10 @@ trait TankWorldControl extends TankAware with WorldAware with SideRestricted {
                   val transferred = tank.fill(handler.drain(facing.getOpposite, amount, true), true)
                   result(transferred > 0, transferred)
               }
-            case _ => world.getBlock(blockPos) match {
+            case _ => result(Unit, "incompatible or no fluid")
-              case fluidBlock: IFluidBlock if fluidBlock.canDrain(world, blockPos.x, blockPos.y, blockPos.z) =>
-                val drained = fluidBlock.drain(world, blockPos.x, blockPos.y, blockPos.z, false)
-                if ((drained != null && drained.amount > 0) && (drained.amount <= amount || amount == 0)) {
-                  if (drained.amount <= amount) {
-                    val filled = tank.fill(fluidBlock.drain(world, blockPos.x, blockPos.y, blockPos.z, true), true)
-                    result(true, filled)
-                  }
-                  else /* if (amount == 0) */ {
-                    result(true, 0)
-                  }
-                }
-                else result(Unit, "tank is full")
-              case liquidBlock: BlockLiquid if world.getBlockMetadata(blockPos) == 0 =>
-                val fluid = FluidRegistry.lookupFluidForBlock(liquidBlock)
-                if (fluid == null) {
-                  result(Unit, "incompatible or no fluid")
-                }
-                else if (tank.fill(new FluidStack(fluid, 1000), false) == 1000) {
-                  tank.fill(new FluidStack(fluid, 1000), true)
-                  world.setBlockToAir(blockPos)
-                  result(true, 1000)
-                }
-                else result(Unit, "tank is full")
-              case _ =>
-                result(Unit, "incompatible or no fluid")
-            }
           }
-          else result(Unit, "incompatible or no fluid")
         }
+        else result(Unit, "tank is full")
       case _ => result(Unit, "no tank selected")
     }
   }
@@ -97,49 +56,28 @@ trait TankWorldControl extends TankAware with WorldAware with SideRestricted {
   @Callback(doc = "function(side:number[, amount:number=1000]):boolean, number of string -- Eject the specified amount of fluid to the specified side. Returns the amount ejected or an error message.")
   def fill(context: Context, args: Arguments): Array[AnyRef] = {
     val facing = checkSideForAction(args, 0)
-    val count = args.optFluidCount(1)
+    val count = args.optFluidCount(1) max 0
     getTank(selectedTank) match {
       case Some(tank) =>
         val amount = math.min(count, tank.getFluidAmount)
-        if (count > 0 && amount == 0) {
+        if (count < 1 || amount > 0) {
-          result(Unit, "tank is empty")
+          FluidUtils.fluidHandlerAt(position.offset(facing)) match {
+            case Some(handler) =>
+              tank.getFluid match {
+                case stack: FluidStack =>
+                  val filled = handler.fill(facing.getOpposite, new FluidStack(stack, amount), true)
+                  if (filled > 0 || amount == 0) {
+                    tank.drain(filled, true)
+                    result(true, filled)
+                  }
+                  else result(Unit, "incompatible or no fluid")
+                case _ =>
+                  result(Unit, "tank is empty")
+              }
+            case _ => result(Unit, "no space")
+          }
         }
-        val blockPos = position.offset(facing)
+        else result(Unit, "tank is empty")
-        if (world.blockExists(blockPos)) world.getTileEntity(blockPos) match {
-          case handler: IFluidHandler =>
-            tank.getFluid match {
-              case stack: FluidStack =>
-                val filled = handler.fill(facing.getOpposite, new FluidStack(stack, amount), true)
-                if (filled > 0 || amount == 0) {
-                  tank.drain(filled, true)
-                  result(true, filled)
-                }
-                else result(Unit, "incompatible or no fluid")
-              case _ =>
-                result(Unit, "tank is empty")
-            }
-          case _ =>
-            val block = world.getBlock(blockPos)
-            if (!block.isAir(blockPos) && !block.isReplaceable(blockPos)) {
-              result(Unit, "no space")
-            }
-            else if (tank.getFluidAmount < 1000) {
-              result(Unit, "tank is empty")
-            }
-            else if (!tank.getFluid.getFluid.canBePlacedInWorld) {
-              result(Unit, "incompatible fluid")
-            }
-            else {
-              val fluidBlock = tank.getFluid.getFluid.getBlock
-              tank.drain(1000, true)
-              world.breakBlock(blockPos)
-              world.setBlock(blockPos, fluidBlock)
-              // This fake neighbor update is required to get stills to start flowing.
-              world.notifyBlockOfNeighborChange(blockPos, world.getBlock(position))
-              result(true, 1000)
-            }
-        }
-        else result(Unit, "no space")
       case _ => result(Unit, "no tank selected")
     }
   }

src/main/scala/li/cil/oc/server/component/traits/WorldTankAnalytics.scala

@@ -5,15 +5,15 @@ import li.cil.oc.api.machine.Arguments
 import li.cil.oc.api.machine.Callback
 import li.cil.oc.api.machine.Context
 import li.cil.oc.server.component.result
-import li.cil.oc.util.ExtendedWorld._
+import li.cil.oc.util.FluidUtils
-import net.minecraftforge.fluids.IFluidHandler
 
 trait WorldTankAnalytics extends WorldAware with SideRestricted {
   @Callback(doc = """function(side:number):number -- Get the amount of fluid in the tank on the specified side.""")
   def getTankLevel(context: Context, args: Arguments): Array[AnyRef] = {
     val facing = checkSideForAction(args, 0)
-    world.getTileEntity(position.offset(facing)) match {
+
-      case handler: IFluidHandler =>
+    FluidUtils.fluidHandlerAt(position.offset(facing)) match {
+      case Some(handler) =>
         result(handler.getTankInfo(facing.getOpposite).map(info => Option(info.fluid).fold(0)(_.amount)).sum)
       case _ => result(Unit, "no tank")
     }
@@ -22,8 +22,8 @@ trait WorldTankAnalytics extends WorldAware with SideRestricted {
   @Callback(doc = """function(side:number):number -- Get the capacity of the tank on the specified side.""")
   def getTankCapacity(context: Context, args: Arguments): Array[AnyRef] = {
     val facing = checkSideForAction(args, 0)
-    world.getTileEntity(position.offset(facing)) match {
+    FluidUtils.fluidHandlerAt(position.offset(facing)) match {
-      case handler: IFluidHandler =>
+      case Some(handler) =>
         result(handler.getTankInfo(facing.getOpposite).map(_.capacity).foldLeft(0)((max, capacity) => math.max(max, capacity)))
       case _ => result(Unit, "no tank")
     }
@@ -32,8 +32,8 @@ trait WorldTankAnalytics extends WorldAware with SideRestricted {
   @Callback(doc = """function(side:number):table -- Get a description of the fluid in the the tank on the specified side.""")
   def getFluidInTank(context: Context, args: Arguments): Array[AnyRef] = if (Settings.get.allowItemStackInspection) {
     val facing = checkSideForAction(args, 0)
-    world.getTileEntity(position.offset(facing)) match {
+    FluidUtils.fluidHandlerAt(position.offset(facing)) match {
-      case handler: IFluidHandler =>
+      case Some(handler) =>
         result(handler.getTankInfo(facing.getOpposite))
       case _ => result(Unit, "no tank")
     }

src/main/scala/li/cil/oc/util/ExtendedArguments.scala

@@ -4,6 +4,7 @@ import li.cil.oc.api.internal.MultiTank
 import li.cil.oc.api.machine.Arguments
 import net.minecraft.inventory.IInventory
 import net.minecraftforge.common.util.ForgeDirection
+import net.minecraftforge.fluids.FluidContainerRegistry
 
 import scala.language.implicitConversions
 
@@ -16,7 +17,7 @@ object ExtendedArguments {
       if (!isDefined(index) || !hasValue(index)) default
       else math.max(0, math.min(64, args.checkInteger(index)))
 
-    def optFluidCount(index: Int, default: Int = 1000) =
+    def optFluidCount(index: Int, default: Int = FluidContainerRegistry.BUCKET_VOLUME) =
       if (!isDefined(index) || !hasValue(index)) default
       else math.max(0, args.checkInteger(index))
 

src/main/scala/li/cil/oc/util/ExtendedBlock.scala

@@ -1,6 +1,7 @@
 package li.cil.oc.util
 
 import net.minecraft.block.Block
+import net.minecraftforge.fluids.IFluidBlock
 
 import scala.language.implicitConversions
 
@@ -20,4 +21,14 @@ object ExtendedBlock {
     def getCollisionBoundingBoxFromPool(position: BlockPosition) = block.getCollisionBoundingBoxFromPool(position.world.get, position.x, position.y, position.z)
   }
 
+  implicit def extendedFluidBlock(block: IFluidBlock): ExtendedFluidBlock = new ExtendedFluidBlock(block)
+
+  class ExtendedFluidBlock(val block: IFluidBlock) {
+    def drain(position: BlockPosition, doDrain: Boolean) = block.drain(position.world.get, position.x, position.y, position.z, doDrain)
+
+    def canDrain(position: BlockPosition) = block.canDrain(position.world.get, position.x, position.y, position.z)
+
+    def getFilledPercentage(position: BlockPosition) = block.getFilledPercentage(position.world.get, position.x, position.y, position.z)
+  }
+
 }

src/main/scala/li/cil/oc/util/FluidUtils.scala

@@ -0,0 +1,157 @@
+package li.cil.oc.util
+
+import li.cil.oc.util.ExtendedBlock._
+import li.cil.oc.util.ExtendedWorld._
+import net.minecraft.block.Block
+import net.minecraft.block.BlockLiquid
+import net.minecraftforge.common.util.ForgeDirection
+import net.minecraftforge.fluids.Fluid
+import net.minecraftforge.fluids.FluidContainerRegistry
+import net.minecraftforge.fluids.FluidRegistry
+import net.minecraftforge.fluids.FluidStack
+import net.minecraftforge.fluids.FluidTank
+import net.minecraftforge.fluids.FluidTankInfo
+import net.minecraftforge.fluids.IFluidBlock
+import net.minecraftforge.fluids.IFluidHandler
+
+object FluidUtils {
+  /**
+   * Retrieves an actual fluid handler implementation for a specified world coordinate.
+   * <p/>
+   * This performs special handling for in-world liquids.
+   */
+  def fluidHandlerAt(position: BlockPosition): Option[IFluidHandler] = position.world match {
+    case Some(world) if world.blockExists(position) => world.getTileEntity(position) match {
+      case handler: IFluidHandler => Option(handler)
+      case _ => Option(new GenericBlockWrapper(position))
+    }
+    case _ => None
+  }
+
+  /**
+   * Transfers some fluid between two fluid handlers.
+   * <p/>
+   * This will try to extract up the specified amount of fluid from any handler,
+   * then insert it into the specified sink handler. If the insertion fails, the
+   * fluid will remain in the source handler.
+   * <p/>
+   * This returns <tt>true</tt> if some fluid was transferred.
+   */
+  def transferBetweenFluidHandlers(source: IFluidHandler, sourceSide: ForgeDirection, sink: IFluidHandler, sinkSide: ForgeDirection, limit: Int = FluidContainerRegistry.BUCKET_VOLUME) = {
+    val drained = source.drain(sourceSide, limit, false)
+    val filled = sink.fill(sinkSide, drained, false)
+    sink.fill(sinkSide, source.drain(sourceSide, filled, true), true)
+  }
+
+  /**
+   * Utility method for calling <tt>transferBetweenFluidHandlers</tt> on handlers
+   * in the world.
+   * <p/>
+   * This uses the <tt>fluidHandlerAt</tt> method, and therefore handles special
+   * cases such as fluid blocks.
+   */
+  def transferBetweenFluidHandlersAt(sourcePos: BlockPosition, sourceSide: ForgeDirection, sinkPos: BlockPosition, sinkSide: ForgeDirection, limit: Int = FluidContainerRegistry.BUCKET_VOLUME) =
+    fluidHandlerAt(sourcePos).fold(0)(source =>
+      fluidHandlerAt(sinkPos).fold(0)(sink =>
+        transferBetweenFluidHandlers(source, sourceSide, sink, sinkSide, limit)))
+
+  // ----------------------------------------------------------------------- //
+
+  private class GenericBlockWrapper(position: BlockPosition) extends IFluidHandler {
+    override def canDrain(from: ForgeDirection, fluid: Fluid): Boolean = currentWrapper.fold(false)(_.canDrain(from, fluid))
+
+    override def drain(from: ForgeDirection, resource: FluidStack, doDrain: Boolean): FluidStack = currentWrapper.fold(null: FluidStack)(_.drain(from, resource, doDrain))
+
+    override def drain(from: ForgeDirection, maxDrain: Int, doDrain: Boolean): FluidStack = currentWrapper.fold(null: FluidStack)(_.drain(from, maxDrain, doDrain))
+
+    override def canFill(from: ForgeDirection, fluid: Fluid): Boolean = currentWrapper.fold(false)(_.canFill(from, fluid))
+
+    override def fill(from: ForgeDirection, resource: FluidStack, doFill: Boolean): Int = currentWrapper.fold(0)(_.fill(from, resource, doFill))
+
+    override def getTankInfo(from: ForgeDirection): Array[FluidTankInfo] = currentWrapper.fold(Array.empty[FluidTankInfo])(_.getTankInfo(from))
+
+    def currentWrapper = if (position.world.get.blockExists(position)) position.world.get.getBlock(position) match {
+      case block: IFluidBlock => Option(new FluidBlockWrapper(position, block))
+      case block: BlockLiquid if FluidRegistry.lookupFluidForBlock(block) != null => Option(new LiquidBlockWrapper(position, block))
+      case block: Block if block.isAir(position) || block.isReplaceable(position) => Option(new AirBlockWrapper(position, block))
+      case _ => None
+    }
+    else None
+  }
+
+  private trait BlockWrapperBase extends IFluidHandler {
+    protected def uncheckedDrain(doDrain: Boolean): FluidStack
+
+    override def drain(from: ForgeDirection, resource: FluidStack, doDrain: Boolean): FluidStack = {
+      val drained = uncheckedDrain(false)
+      if (drained != null && (resource == null || (drained.getFluid == resource.getFluid && drained.amount <= resource.amount))) {
+        uncheckedDrain(doDrain)
+      }
+      else null
+    }
+
+    override def drain(from: ForgeDirection, maxDrain: Int, doDrain: Boolean): FluidStack = {
+      val drained = uncheckedDrain(false)
+      if (drained != null && drained.amount <= maxDrain) {
+        uncheckedDrain(doDrain)
+      }
+      else null
+    }
+
+    override def canFill(from: ForgeDirection, fluid: Fluid): Boolean = false
+
+    override def fill(from: ForgeDirection, resource: FluidStack, doFill: Boolean): Int = 0
+  }
+
+  private class FluidBlockWrapper(val position: BlockPosition, val block: IFluidBlock) extends BlockWrapperBase {
+    final val AssumedCapacity = FluidContainerRegistry.BUCKET_VOLUME
+
+    override def canDrain(from: ForgeDirection, fluid: Fluid): Boolean = block.canDrain(position)
+
+    override def getTankInfo(from: ForgeDirection): Array[FluidTankInfo] = Array(new FluidTankInfo(new FluidTank(block.getFluid, (block.getFilledPercentage(position) * AssumedCapacity).toInt, AssumedCapacity)))
+
+    override protected def uncheckedDrain(doDrain: Boolean): FluidStack = block.drain(position, doDrain)
+  }
+
+  private class LiquidBlockWrapper(val position: BlockPosition, val block: BlockLiquid) extends BlockWrapperBase {
+    val fluid = FluidRegistry.lookupFluidForBlock(block)
+
+    override def canDrain(from: ForgeDirection, fluid: Fluid): Boolean = true
+
+    override def getTankInfo(from: ForgeDirection): Array[FluidTankInfo] = Array(new FluidTankInfo(new FluidTank(fluid, FluidContainerRegistry.BUCKET_VOLUME, FluidContainerRegistry.BUCKET_VOLUME)))
+
+    override protected def uncheckedDrain(doDrain: Boolean): FluidStack = {
+      if (doDrain) {
+        position.world.get.setBlockToAir(position)
+      }
+      new FluidStack(fluid, FluidContainerRegistry.BUCKET_VOLUME)
+    }
+  }
+
+  private class AirBlockWrapper(val position: BlockPosition, val block: Block) extends IFluidHandler {
+    override def canDrain(from: ForgeDirection, fluid: Fluid): Boolean = false
+
+    override def drain(from: ForgeDirection, resource: FluidStack, doDrain: Boolean): FluidStack = null
+
+    override def drain(from: ForgeDirection, maxDrain: Int, doDrain: Boolean): FluidStack = null
+
+    override def canFill(from: ForgeDirection, fluid: Fluid): Boolean = fluid.canBePlacedInWorld
+
+    override def fill(from: ForgeDirection, resource: FluidStack, doFill: Boolean): Int = {
+      if (resource != null && resource.getFluid.canBePlacedInWorld && resource.getFluid.getBlock != null) {
+        if (doFill) {
+          val world = position.world.get
+          world.breakBlock(position)
+          world.setBlock(position, resource.getFluid.getBlock)
+          // This fake neighbor update is required to get stills to start flowing.
+          world.notifyBlockOfNeighborChange(position, world.getBlock(position))
+        }
+        FluidContainerRegistry.BUCKET_VOLUME
+      }
+      else 0
+    }
+
+    override def getTankInfo(from: ForgeDirection): Array[FluidTankInfo] = Array.empty
+  }
+
+}

src/main/scala/li/cil/oc/util/InventoryUtils.scala

@@ -221,6 +221,48 @@ object InventoryUtils {
   def extractFromInventoryAt(consumer: (ItemStack) => Unit, position: BlockPosition, side: ForgeDirection, limit: Int = 64) =
     inventoryAt(position).exists(extractFromInventory(consumer, _, side, limit))
 
+  /**
+   * Transfers some items between two inventories.
+   * <p/>
+   * This will try to extract up the specified number of items from any inventory,
+   * then insert it into the specified sink inventory. If the insertion fails, the
+   * items will remain in the source inventory.
+   * <p/>
+   * This uses the <tt>extractFromInventory</tt> and <tt>insertIntoInventory</tt>
+   * methods, and therefore handles special cases such as sided inventories and
+   * stack size limits.
+   * <p/>
+   * This returns <tt>true</tt> if at least one item was transferred.
+   */
+  def transferBetweenInventories(source: IInventory, sourceSide: ForgeDirection, sink: IInventory, sinkSide: Option[ForgeDirection], limit: Int = 64) =
+    extractFromInventory(
+      insertIntoInventory(_, sink, sinkSide, limit), source, sourceSide, limit)
+
+  /**
+   * Like <tt>transferBetweenInventories</tt> but moving between specific slots.
+   */
+  def transferBetweenInventoriesSlots(source: IInventory, sourceSide: ForgeDirection, sourceSlot: Int, sink: IInventory, sinkSide: Option[ForgeDirection], sinkSlot: Int, limit: Int = 64) =
+    extractFromInventorySlot(
+      insertIntoInventorySlot(_, sink, sinkSide, sinkSlot, limit), source, sourceSide, sourceSlot, limit)
+
+  /**
+   * Utility method for calling <tt>transferBetweenInventories</tt> on inventories
+   * in the world.
+   */
+  def transferBetweenInventoriesAt(source: BlockPosition, sourceSide: ForgeDirection, sink: BlockPosition, sinkSide: Option[ForgeDirection], limit: Int = 64) =
+    inventoryAt(source).exists(sourceInventory =>
+      inventoryAt(sink).exists(sinkInventory =>
+        transferBetweenInventories(sourceInventory, sourceSide, sinkInventory, sinkSide, limit)))
+
+  /**
+   * Utility method for calling <tt>transferBetweenInventoriesSlots</tt> on inventories
+   * in the world.
+   */
+  def transferBetweenInventoriesSlotsAt(sourcePos: BlockPosition, sourceSide: ForgeDirection, sourceSlot: Int, sinkPos: BlockPosition, sinkSide: Option[ForgeDirection], sinkSlot: Int, limit: Int = 64) =
+    inventoryAt(sourcePos).exists(sourceInventory =>
+      inventoryAt(sinkPos).exists(sinkInventory =>
+        transferBetweenInventoriesSlots(sourceInventory, sourceSide, sourceSlot, sinkInventory, sinkSide, sinkSlot, limit)))
+
   /**
    * Utility method for dropping contents from a single inventory slot into
    * the world.