fluidmap won't have errenous behaviour at the world edge; tga alpha fix

src/net/torvald/terrarum/modulebasegame/gameworld/WorldSimulator.kt

@@ -25,6 +25,7 @@ object WorldSimulator {
      * In tiles;
      * square width/height = field * 2
      */
+    // TODO: increase the radius and then MULTITHREAD
     const val FLUID_UPDATING_SQUARE_RADIUS = 80 // larger value will have dramatic impact on performance
     const private val DOUBLE_RADIUS = FLUID_UPDATING_SQUARE_RADIUS * 2
 

src/net/torvald/terrarum/realestate/LandUtil.kt

@@ -4,13 +4,15 @@ import net.torvald.terrarum.Terrarum
 import net.torvald.terrarum.gameactors.faction.FactionCodex
 import net.torvald.terrarum.gameworld.BlockAddress
 import net.torvald.terrarum.gameworld.GameWorld
+import net.torvald.terrarum.gameworld.fmod
 
 /**
  * Created by minjaesong on 2016-03-27.
  */
 object LandUtil {
     fun getBlockAddr(world: GameWorld, x: Int, y: Int): BlockAddress =
-            (world.width * y).toLong() + x
+            // coercing and fmod-ing follows ROUNDWORLD rule
+            (world.width * y.coerceIn(0, world.height - 1)).toLong() + x.fmod(world.width)
 
     fun resolveBlockAddr(world: GameWorld, t: BlockAddress): Pair<Int, Int> =
             Pair((t % world.width).toInt(), (t / world.width).toInt())
@@ -26,4 +28,6 @@ object LandUtil {
                 Terrarum.ingame!!.getActorByID(id)
             else
                 FactionCodex.getFactionByID(id)
+
+
 }

src/net/torvald/terrarum/worlddrawer/BlocksDrawerNew.kt

@@ -82,6 +82,12 @@ internal object BlocksDrawer {
     private val shader = ShaderProgram(Gdx.files.internal("assets/4096.vert"), Gdx.files.internal("assets/tiling.frag"))
 
     init {
+        // PNG still doesn't work right.
+        // The thing is, pixel with alpha 0 must have RGB of also 0, which PNG does not guarantee it.
+        // (pixels of RGB = 255, A = 0 -- white transparent -- causes 'glow')
+        // with TGA, you have a complete control over this, with the expense of added hassle on your side.
+        // -- Torvald, 2018-12-19
+
         // hard-coded as tga.gz
         val gzFileList = listOf("blocks/terrain.tga.gz", "blocks/wire.tga.gz", "blocks/terrain_autumn.tga.gz")
         val gzTmpFName = listOf("tmp_terrain.tga", "tmp_wire.tga", "tmp_terrain_autumn.tga")