[WIP] major rewrite, grass and leaves working already

2021-05-06 22:40:32 +02:00
parent 09ccb83e8b
commit f44d2a7a50
96 changed files with 2348 additions and 3531 deletions
--- a/src/main/kotlin/mods/betterfoliage/render/lighting/AoSideHelper.kt
+++ b/src/main/kotlin/mods/betterfoliage/render/lighting/AoSideHelper.kt
@@ -0,0 +1,138 @@
+package mods.betterfoliage.render.lighting
+
+import mods.betterfoliage.util.get
+import mods.betterfoliage.util.mapArray
+import mods.betterfoliage.util.perpendiculars
+import net.minecraft.util.Direction
+import net.minecraft.util.Direction.*
+
+typealias BoxCorner = Triple<Direction, Direction, Direction>
+fun BoxCorner.equalsUnordered(other: BoxCorner) = contains(other.first) && contains(other.second) && contains(other.third)
+
+fun BoxCorner.contains(dir: Direction) = first == dir || second == dir || third == dir
+
+fun Array<BoxCorner>.findIdx(corner: BoxCorner): Int? {
+    forEachIndexed { idx, test -> if (test.contains(corner.first) && test.contains(corner.second) && test.contains(corner.third)) return idx }
+    return null
+}
+fun Array<BoxCorner>.findIdx(predicate: (BoxCorner)->Boolean): Int? {
+    forEachIndexed { idx, test -> if (predicate(test)) return idx }
+    return null
+}
+
+class AoSideHelper private constructor(face: Direction) {
+    val sides = faceSides[face]
+    val cornerSideDirections = faceCorners[face]
+    val aoIndex = faceCornersIdx.mapArray { corner ->
+        boxCornersDirIdx[face][sides[corner.first]][sides[corner.second]]!!
+    }
+
+    companion object {
+        /**
+         * Indexing for undirected box corners (component order does not matter).
+         * Array contains [Direction] triplets fully defining the corner.
+         */
+        @JvmField
+        val boxCornersUndir = Array(8) { idx -> Triple(
+            if (idx and 1 != 0) EAST else WEST,
+            if (idx and 2 != 0) UP else DOWN,
+            if (idx and 4 != 0) SOUTH else NORTH
+        ) }
+
+        /**
+         * Reverse lookup for [boxCornersUndir]. Index 3 times with the corner's cardinal directions.
+         *  A null value indicates an invalid corner (multiple indexing along the same axis)
+         */
+        @JvmField
+        val boxCornersUndirIdx = Array(6) { idx1 -> Array(6) { idx2 -> Array(6) { idx3 ->
+            boxCornersUndir.findIdx(BoxCorner(
+                Direction.values()[idx1],
+                Direction.values()[idx2],
+                Direction.values()[idx3]
+            ))
+        } } }
+
+        /**
+         * Indexing for directed face sides
+         * First index is the face, second is index of side on face
+         */
+        @JvmField
+        val faceSides = Array(6) { faceIdx -> Array(4) { sideIdx ->
+            Direction.values()[faceIdx].perpendiculars[sideIdx]
+        } }
+
+        /**
+         * Pairs of [faceSides] side indexes that form a valid pair describing a corner
+         */
+        @JvmField
+        val faceCornersIdx = arrayOf(0 to 2, 0 to 3, 1 to 2, 1 to 3)
+
+        /**
+         * Indexing for directed face corners
+         * First index is the face, second is index of corner on face
+         */
+        @JvmField
+        val faceCorners = Array(6) { faceIdx -> Array(4) { cornerIdx ->
+            faceCornersIdx[cornerIdx].let { faceSides[faceIdx][it.first] to faceSides[faceIdx][it.second] }
+        } }
+
+        /**
+         * Indexing scheme for directed box corners.
+         * The first direction - the face - matters, the other two are unordered.
+         * 1:1 correspondence with possible AO values.
+         * Array contains triplets defining the corner fully.
+         */
+        @JvmField
+        val boxCornersDir = Array(24) { idx ->
+            val faceIdx = idx / 4; val face = Direction.values()[faceIdx]
+            val cornerIdx = idx % 4; val corner = faceCorners[faceIdx][cornerIdx]
+            BoxCorner(face, corner.first, corner.second)
+        }
+
+        /**
+         * Reverse lookup for [boxCornersDir]. Index 3 times with the corner's cardinal directions.
+         * The first direction - the face - matters, the other two are unordered.
+         *  A null value indicates an invalid corner (multiple indexing along the same axis)
+         */
+        @JvmField
+        val boxCornersDirIdx = Array(6) { face -> Array(6) { side1 -> Array(6) { side2 ->
+            boxCornersDir.findIdx { boxCorner ->
+                boxCorner.first.ordinal == face && boxCorner.equalsUnordered(BoxCorner(
+                    Direction.values()[face],
+                    Direction.values()[side1],
+                    Direction.values()[side2]
+                ))
+            }
+        } } }
+
+        /**
+         * Reverse lookup for [cornersDir].
+         *   1st index: primary face
+         *   2nd index: undirected corner index.
+         *   value: directed corner index
+         *   A null value indicates an invalid corner (primary face not shared by corner).
+         */
+        @JvmField
+        val boxCornersDirFromUndir = Array(6) { faceIdx -> Array(8) { undirIdx ->
+            val face = Direction.values()[faceIdx]
+            val corner = boxCornersUndir[undirIdx]
+            if (!corner.contains(face)) null
+            else boxCornersDir.findIdx { it.first == face && it.equalsUnordered(corner) }
+        } }
+
+        @JvmField
+        val forSide = Direction.values().mapArray { AoSideHelper(it) }
+
+        /**
+         * Get corner index for vertex coordinates
+         */
+        @JvmStatic
+        fun getCornerUndir(x: Double, y: Double, z: Double): Int {
+            var result = 0
+            if (x > 0.0) result += 1
+            if (y > 0.0) result += 2
+            if (z > 0.0) result += 4
+            return result
+        }
+    }
+}