Add setting to allow disabling holograms emitting light. Closes #979.

src/main/resources/application.conf

@@ -1152,6 +1152,10 @@ opencomputers {
     # the *worst case* is ~30KB/s/client. Again, for normal use-cases this
     # is actually barely noticeable.
     setRawDelay: 0.2
+
+    # Whether the hologram block should provide light. It'll also emit light
+    # when off, because having state-based light in MC is... painful.
+    emitLight: true
   }
 
   # Other settings that you might find useful to tweak.

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

@@ -307,6 +307,7 @@ class Settings(val config: Config) {
       Array(0.25, 0.5)
   }
   val hologramSetRawDelay = config.getDouble("hologram.setRawDelay") max 0
+  val hologramLight = config.getBoolean("hologram.emitLight")
 
   // ----------------------------------------------------------------------- //
   // misc

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

@@ -4,6 +4,7 @@ import java.util
 
 import cpw.mods.fml.relauncher.Side
 import cpw.mods.fml.relauncher.SideOnly
+import li.cil.oc.Settings
 import li.cil.oc.common.tileentity
 import li.cil.oc.integration.coloredlights.ModColoredLights
 import li.cil.oc.util.Rarity
@@ -15,7 +16,9 @@ import net.minecraft.world.World
 import net.minecraftforge.common.util.ForgeDirection
 
 class Hologram(val tier: Int) extends SimpleBlock with traits.SpecialBlock {
-  ModColoredLights.setLightLevel(this, 15, 15, 15)
+  if (Settings.get.hologramLight) {
+    ModColoredLights.setLightLevel(this, 15, 15, 15)
+  }
   setBlockBounds(0, 0, 0, 1, 0.5f, 1)
 
   // ----------------------------------------------------------------------- //