new lightmap: nice try but didn't work

src/net/torvald/gdx/graphics/Cvec.kt

@@ -70,6 +70,21 @@ class Cvec {
         set(color)
     }
 
+    /**
+     * Get RGBA Element using index, of which:
+     * - 0: R
+     * - 1: G
+     * - 2: B
+     * - 3: A
+     */
+    fun getElem(index: Int) = when(index) {
+        0 -> r
+        1 -> g
+        2 -> b
+        3 -> a
+        else -> throw IndexOutOfBoundsException("Invalid index $index")
+    }
+
     /** Sets this color to the given color.
      *
      * @param color the Cvec

src/net/torvald/gdx/graphics/UnsafeCvecArray.kt

@@ -29,6 +29,18 @@ internal class UnsafeCvecArray(val width: Int, val height: Int) {
     fun setB(x: Int, y: Int, value: Float) { array.setFloat(toAddr(x, y) + 8, value) }
     fun setA(x: Int, y: Int, value: Float) { array.setFloat(toAddr(x, y) + 12, value) }
 
+    /**
+     * @param channel 0 for R, 1 for G, 2 for B, 3 for A
+     */
+    inline fun channelSet(x: Int, y: Int, channel: Int, value: Float) {
+        array.setFloat(toAddr(x, y) + 4L * channel, value)
+    }
+
+    /**
+     * @param channel 0 for R, 1 for G, 2 for B, 3 for A
+     */
+    inline fun channelGet(x: Int, y: Int, channel: Int) = array.getFloat(toAddr(x, y) + 4L * channel)
+
     fun max(x: Int, y: Int, other: Cvec) {
         setR(x, y, maxOf(getR(x, y), other.r))
         setG(x, y, maxOf(getG(x, y), other.g))