[WIP] start 1.15 port

reorganize packages to match Fabric version
use util classes from Fabric version

src/main/kotlin/mods/betterfoliage/render/old/BlockContext.kt

@@ -0,0 +1,80 @@
+package mods.betterfoliage.render.old
+
+import com.mojang.blaze3d.matrix.MatrixStack
+import com.mojang.blaze3d.vertex.IVertexBuilder
+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.client.renderer.BlockRendererDispatcher
+import net.minecraft.client.renderer.RenderType
+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.minecraftforge.client.model.data.IModelData
+import java.util.*
+
+/**
+ * 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 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) }
+}
+
+open class BasicBlockCtx(
+    override val world: ILightReader,
+    override val pos: BlockPos
+) : BlockCtx {
+    override var state: BlockState = world.getBlockState(pos)
+        protected set
+    override fun offset(offset: Int3) = BasicBlockCtx(world, pos + offset)
+    fun cache() = CachedBlockCtx(world, pos)
+}
+
+open class CachedBlockCtx(world: ILightReader, pos: BlockPos) : BasicBlockCtx(world, pos) {
+    var neighbors = Array<BlockState>(6) { world.getBlockState(pos + allDirections[it].offset) }
+    override var biome: Biome? = super.biome
+    override fun state(dir: Direction) = neighbors[dir.ordinal]
+}
+
+
+data class RenderCtx(
+    val dispatcher: BlockRendererDispatcher,
+    val renderBuffer: IVertexBuilder,
+    val matrixStack: MatrixStack,
+    val layer: RenderType,
+    val checkSides: Boolean,
+    val random: Random,
+    val modelData: IModelData
+) {
+    fun render(worldBlock: BlockCtx) =
+//        dispatcher.renderBlock(worldBlock.state, worldBlock.pos, worldBlock.world, renderBuffer, random, modelData)
+    dispatcher.renderModel(worldBlock.state, worldBlock.pos, worldBlock.world, matrixStack, renderBuffer, checkSides, random, modelData)
+}
+