[WIP] initial Fabric port

major package refactoring

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 net.minecraft.block.Block
+import net.minecraft.block.BlockState
+import net.minecraft.client.MinecraftClient
+import net.minecraft.util.math.BlockPos
+import net.minecraft.util.math.Direction
+import net.minecraft.world.ExtendedBlockView
+import net.minecraft.world.biome.Biome
+
+/**
+ * Represents the block being rendered. Has properties and methods to query the neighborhood of the block in
+ * block-relative coordinates.
+ */
+interface BlockCtx {
+    val world: ExtendedBlockView
+    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.getBiome(pos)
+
+    val isNormalCube: Boolean get() = state.isSimpleFullBlock(world, pos)
+
+    fun shouldSideBeRendered(side: Direction) = Block.shouldDrawSide(state, world, pos, side)
+
+    fun isNeighborSolid(dir: Direction) = offset(dir).let { it.state.isSideSolidFullSquare(it.world, it.pos, dir.opposite) }
+
+    fun model(dir: Direction) = state(dir).let { MinecraftClient.getInstance().blockRenderManager.getModel(it)!! }
+    fun model(offset: Int3) = state(offset).let { MinecraftClient.getInstance().blockRenderManager.getModel(it)!! }
+}
+
+open class BasicBlockCtx(
+    override val world: ExtendedBlockView,
+    override val pos: BlockPos
+) : BlockCtx {
+    override val state = world.getBlockState(pos)
+    override fun offset(offset: Int3) = BasicBlockCtx(world, pos + offset)
+    fun cache() = CachedBlockCtx(world, pos)
+}
+
+open class CachedBlockCtx(world: ExtendedBlockView, pos: BlockPos) : BasicBlockCtx(world, pos) {
+    var neighbors = Array<BlockState>(6) { world.getBlockState(pos + allDirections[it].offset) }
+    override var biome: Biome = world.getBiome(pos)
+    override fun state(dir: Direction) = neighbors[dir.ordinal]
+}