light calc area shrinks when zoomed in

src/net/torvald/terrarum/Terrarum.kt

@@ -238,16 +238,16 @@ object Terrarum : Disposable {
 
     /** Position of the cursor in the world */
     val mouseX: Double
-        get() = WorldCamera.x + Gdx.input.x / (ingame?.screenZoom ?: 1f).toDouble()
+        get() = WorldCamera.zoomedX + Gdx.input.x / (ingame?.screenZoom ?: 1f).toDouble()
     /** Position of the cursor in the world */
     val mouseY: Double
-        get() = WorldCamera.y + Gdx.input.y / (ingame?.screenZoom ?: 1f).toDouble()
+        get() = WorldCamera.zoomedY + Gdx.input.y / (ingame?.screenZoom ?: 1f).toDouble()
     /** Position of the cursor in the world */
     val oldMouseX: Double
-        get() = WorldCamera.x + (Gdx.input.x - Gdx.input.deltaX) / (ingame?.screenZoom ?: 1f).toDouble()
+        get() = WorldCamera.zoomedX + (Gdx.input.x - Gdx.input.deltaX) / (ingame?.screenZoom ?: 1f).toDouble()
     /** Position of the cursor in the world */
     val oldMouseY: Double
-        get() = WorldCamera.y + (Gdx.input.y - Gdx.input.deltaY) / (ingame?.screenZoom ?: 1f).toDouble()
+        get() = WorldCamera.zoomedY + (Gdx.input.y - Gdx.input.deltaY) / (ingame?.screenZoom ?: 1f).toDouble()
     /** Position of the cursor in the world */
     @JvmStatic val mouseTileX: Int
         get() = (mouseX / CreateTileAtlas.TILE_SIZE).floorInt()

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

@@ -119,8 +119,12 @@ object LightmapRenderer {
     internal var for_y_start = 0
     internal var for_x_end = 0
     internal var for_y_end = 0
-    internal var for_x = 0
-    internal var for_y = 0
+    internal var for_draw_x_start = 0
+    internal var for_draw_y_start = 0
+    internal var for_draw_x_end = 0
+    internal var for_draw_y_end = 0
+    //internal var for_x = 0
+    //internal var for_y = 0
 
     /**
      * @param x world coord
@@ -174,19 +178,23 @@ object LightmapRenderer {
         if (world.worldIndex == -1) return
 
 
-        for_x_start = WorldCamera.x / TILE_SIZE // fix for premature lightmap rendering
-        for_y_start = WorldCamera.y / TILE_SIZE // on topmost/leftmost side
+        for_x_start = WorldCamera.zoomedX / TILE_SIZE // fix for premature lightmap rendering
+        for_y_start = WorldCamera.zoomedY / TILE_SIZE // on topmost/leftmost side
+        for_draw_x_start = WorldCamera.x / TILE_SIZE
+        for_draw_y_start = WorldCamera.y / TILE_SIZE
 
         if (for_x_start < 0) for_x_start -= 1 // to fix that the light shifts 1 tile to the left when WorldCamera < 0
         //if (for_y_start < 0) for_y_start -= 1 // not needed when we only wrap at x axis
 
         if (WorldCamera.x in -(TILE_SIZE - 1)..-1) for_x_start -= 1 // another edge-case fix
 
-        for_x_end = for_x_start + WorldCamera.width / TILE_SIZE + 3
-        for_y_end = for_y_start + WorldCamera.height / TILE_SIZE + 3 // same fix as above
+        for_x_end = for_x_start + WorldCamera.zoomedWidth / TILE_SIZE + 3
+        for_y_end = for_y_start + WorldCamera.zoomedHeight / TILE_SIZE + 3 // same fix as above
+        for_draw_x_end = for_draw_x_start + WorldCamera.width / TILE_SIZE + 3
+        for_draw_y_end = for_draw_y_start + WorldCamera.height / TILE_SIZE + 3
 
-        for_x = for_x_start + (for_x_end - for_x_start) / 2
-        for_y = for_y_start + (for_y_end - for_y_start) / 2
+        //for_x = for_x_start + (for_x_end - for_x_start) / 2
+        //for_y = for_y_start + (for_y_end - for_y_start) / 2
 
         //println("$for_x_start..$for_x_end, $for_x\t$for_y_start..$for_y_end, $for_y")
 
@@ -609,10 +617,10 @@ object LightmapRenderer {
         // when shader is not used: 0.5 ms on 6700K
         AppLoader.measureDebugTime("Renderer.LightToScreen") {
 
-            val this_x_start = for_x_start// + overscan_open
-            val this_x_end = for_x_end// + overscan_open
-            val this_y_start = for_y_start// + overscan_open
-            val this_y_end = for_y_end// + overscan_open
+            val this_x_start = for_draw_x_start
+            val this_y_start = for_draw_y_start
+            val this_x_end = for_draw_x_end
+            val this_y_end = for_draw_y_end
 
             // wipe out beforehand. You DO need this
             lightBuffer.blending = Pixmap.Blending.None // gonna overwrite (remove this line causes the world to go bit darker)

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

@@ -2,6 +2,8 @@ package net.torvald.terrarum.worlddrawer
 
 import com.jme3.math.FastMath
 import net.torvald.terrarum.AppLoader
+import net.torvald.terrarum.Terrarum
+import net.torvald.terrarum.ceilInt
 import net.torvald.terrarum.floorInt
 import net.torvald.terrarum.gameactors.ActorWBMovable
 import net.torvald.terrarum.gameactors.ActorWithBody
@@ -21,18 +23,37 @@ object WorldCamera {
         private set
     var y: Int = 0 // top position
         private set
-    var xEnd: Int = 0 // right position
-        private set
-    var yEnd: Int = 0 // bottom position
-        private set
-    inline val gdxCamX: Float // centre position
-        get() = xCentre.toFloat()
-    inline val gdxCamY: Float// centre position
-        get() = yCentre.toFloat()
+
     var width: Int = 0
         private set
     var height: Int = 0
         private set
+
+    private var zoom = 1f
+    private var zoomSamplePoint = 0f
+
+    // zoomed coords. Currently only being used by the lightmaprenderer.
+    // What about others? We just waste 3/4 of the framebuffer
+    val zoomedX: Int
+        get() = x + (width * zoomSamplePoint).toInt()
+    val zoomedY: Int
+        get() = y + (height * zoomSamplePoint).toInt()
+
+    val zoomedWidth: Int
+        get() = (width / zoom).ceilInt()
+    val zoomedHeight: Int
+        get() = (height / zoom).ceilInt()
+
+    var xEnd: Int = 0 // right position
+        private set
+    var yEnd: Int = 0 // bottom position
+        private set
+
+    inline val gdxCamX: Float // centre position
+        get() = xCentre.toFloat()
+    inline val gdxCamY: Float// centre position
+        get() = yCentre.toFloat()
+
     inline val xCentre: Int
         get() = x + width.ushr(1)
     inline val yCentre: Int
@@ -45,6 +66,8 @@ object WorldCamera {
 
         width = AppLoader.screenW//FastMath.ceil(AppLoader.screenW / zoom) // div, not mul
         height = AppLoader.screenH//FastMath.ceil(AppLoader.screenH / zoom)
+        zoom = Terrarum.ingame?.screenZoom ?: 1f
+        zoomSamplePoint = (1f - 1f / zoom) / 2f // will never quite exceed 0.5
 
         // TOP-LEFT position of camera border