[WIP] start 1.15 port

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

src/main/kotlin/mods/betterfoliage/render/block/vanillaold/RenderNetherrack.kt

@@ -0,0 +1,44 @@
+package mods.betterfoliage.render.block.vanillaold
+
+import mods.betterfoliage.BetterFoliageMod
+import mods.betterfoliage.config.Config
+import mods.betterfoliage.render.lighting.cornerAo
+import mods.betterfoliage.render.lighting.cornerFlat
+import mods.betterfoliage.render.lighting.faceOrientedAuto
+import mods.betterfoliage.render.old.CombinedContext
+import mods.betterfoliage.render.old.RenderDecorator
+import mods.betterfoliage.render.toCross
+import mods.betterfoliage.render.xzDisk
+import mods.betterfoliage.resource.Identifier
+import mods.betterfoliage.util.randomD
+import net.minecraft.block.Blocks
+import net.minecraft.util.Direction.Axis
+import net.minecraft.util.Direction.*
+
+class RenderNetherrack : RenderDecorator(BetterFoliageMod.MOD_ID, BetterFoliageMod.bus) {
+
+    val netherrackIcon = spriteSet { idx -> Identifier(BetterFoliageMod.MOD_ID, "blocks/better_netherrack_$idx") }
+    val netherrackModel = modelSet(64) { modelIdx ->
+        verticalRectangle(x1 = -0.5, z1 = 0.5, x2 = 0.5, z2 = -0.5, yTop = -0.5,
+        yBottom = -0.5 - randomD(Config.netherrack.heightMin, Config.netherrack.heightMax))
+        .setAoShader(faceOrientedAuto(overrideFace = DOWN, corner = cornerAo(Axis.Y)))
+        .setFlatShader(faceOrientedAuto(overrideFace = DOWN, corner = cornerFlat))
+        .toCross(UP) { it.move(xzDisk(modelIdx) * Config.shortGrass.hOffset) }.addAll()
+
+    }
+
+    override fun isEligible(ctx: CombinedContext) =
+        Config.enabled && Config.netherrack.enabled && ctx.state.block == Blocks.NETHERRACK
+
+    override fun render(ctx: CombinedContext) {
+        ctx.render()
+        if (!ctx.isCutout) return
+        if (ctx.offset(DOWN).isNormalCube) return
+
+        val rand = ctx.semiRandomArray(2)
+        ctx.render(
+            netherrackModel[rand[0]],
+            icon = { _, qi, _ -> netherrackIcon[rand[qi and 1]] }
+        )
+    }
+}