[WIP] major rewrite, grass and leaves working already

src/main/kotlin/mods/betterfoliage/chunk/BlockContext.kt

@@ -0,0 +1,55 @@
+package mods.betterfoliage.chunk
+
+import mods.betterfoliage.util.Int3
+import mods.betterfoliage.util.allDirections
+import mods.betterfoliage.util.offset
+import mods.betterfoliage.util.plus
+import mods.betterfoliage.util.semiRandom
+import net.minecraft.block.Block
+import net.minecraft.block.BlockState
+import net.minecraft.util.Direction
+import net.minecraft.util.math.BlockPos
+import net.minecraft.world.ILightReader
+import net.minecraft.world.IWorldReader
+import net.minecraft.world.biome.Biome
+import net.minecraft.world.level.ColorResolver
+
+/**
+ * Represents the block being rendered. Has properties and methods to query the neighborhood of the block in
+ * block-relative coordinates.
+ */
+interface BlockCtx {
+    val world: ILightReader
+    val pos: BlockPos
+
+    fun offset(dir: Direction) = offset(dir.offset)
+    fun offset(offset: Int3): BlockCtx
+
+    val state: BlockState get() = world.getBlockState(pos)
+    fun state(dir: Direction) = world.getBlockState(pos + dir.offset)
+    fun state(offset: Int3) = world.getBlockState(pos + offset)
+
+    val biome: Biome? get() = (world as? IWorldReader)?.getBiome(pos)
+
+    val isNormalCube: Boolean get() = state.isNormalCube(world, pos)
+
+    fun isNeighborSolid(dir: Direction) = offset(dir).let { it.state.isSolidSide(it.world, it.pos, dir.opposite) }
+
+    fun shouldSideBeRendered(side: Direction) = Block.shouldSideBeRendered(state, world, pos, side)
+
+    /** Get a semi-random value based on the block coordinate and the given seed. */
+    fun semiRandom(seed: Int) = pos.semiRandom(seed)
+
+    /** Get an array of semi-random values based on the block coordinate. */
+    fun semiRandomArray(num: Int): Array<Int> = Array(num) { semiRandom(it) }
+
+    fun color(resolver: ColorResolver) = world.getBlockColor(pos, resolver)
+}
+
+class BasicBlockCtx(
+    override val world: ILightReader,
+    override val pos: BlockPos
+) : BlockCtx {
+    override val state: BlockState = world.getBlockState(pos)
+    override fun offset(offset: Int3) = BasicBlockCtx(world, pos + offset)
+}