Baked object placement

- Bake rotated block offsets, palette indexes, tiles and canopy bits per object and spin kernel
- Resolve decay, rotation, waterlog and air facts once per palette entry per placement
- Skip the destination read for waterloggable states that cannot become waterlogged
- Move SpinKernel to its own file

core/src/test/java/art/arcane/iris/structure/object/IrisObjectPlacementRunnerRegressionTest.java

@@ -791,7 +791,7 @@ public class IrisObjectPlacementRunnerRegressionTest {
 
                     object.place(0, ANCHOR_Y, 0, placer, placement, new RNG(2L), data);
 
-                    assertEquals(1, placer.blockReads);
+                    assertEquals(enabled || authored ? 1 : 0, placer.blockReads);
                     assertEquals(1, placer.writes().size());
                     assertSame(submerged && (enabled || authored) ? wet : dry,
                             placer.writes().get(0).state());

core/src/test/java/art/arcane/iris/structure/object/ObjectPlacementBakeTest.java

@@ -0,0 +1,76 @@
+package art.arcane.iris.structure.object;
+
+import art.arcane.iris.generation.geometry.IrisBlockVector;
+import art.arcane.iris.testsupport.KeyedBlockState;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotSame;
+import static org.junit.Assert.assertSame;
+
+public class ObjectPlacementBakeTest {
+    @Test
+    public void spinsResolvingToTheSameKernelShareOneBake() {
+        IrisObject object = object();
+        IrisObjectRotation rotation = new IrisObjectRotation();
+
+        ObjectPlacementBake first = ObjectPlacementBake.of(object, new SpinKernel(rotation, 0, 10, 0), false, null);
+        ObjectPlacementBake second = ObjectPlacementBake.of(object, new SpinKernel(rotation, 3, 80, 9), false, null);
+        ObjectPlacementBake turned = ObjectPlacementBake.of(object, new SpinKernel(rotation, 0, 100, 0), false, null);
+
+        assertSame(first, second);
+        assertNotSame(first, turned);
+        assertEquals(3, first.count());
+    }
+
+    @Test
+    public void bakedOffsetsMatchTheKernelTransformInCursorOrder() {
+        IrisObject object = object();
+        IrisObjectRotation rotation = IrisObjectRotation.of(0D, 90D, 0D);
+        SpinKernel spin = new SpinKernel(rotation, 0, 0, 0);
+        IrisBlockVector translate = new IrisBlockVector(1.5D, -2D, 0.25D);
+
+        ObjectPlacementBake bake = ObjectPlacementBake.of(object, spin, true, translate);
+        double[] exact = bake.exact(object, spin);
+
+        int index = 0;
+        for (IrisBlockVector source : object.getBlocks().keys()) {
+            IrisBlockVector expected = source.clone();
+            spin.rotate(expected);
+            expected.setY(-expected.getBlockY());
+            expected.add(translate);
+            assertEquals((int) Math.round(expected.getX()), bake.offsetX(index));
+            assertEquals((int) Math.round(expected.getY()), bake.offsetY(index));
+            assertEquals((int) Math.round(expected.getZ()), bake.offsetZ(index));
+            assertEquals(expected.getBlockY(), bake.layerY(index));
+            assertEquals(expected.getX(), exact[index * 3], 0D);
+            assertEquals(expected.getY(), exact[index * 3 + 1], 0D);
+            assertEquals(expected.getZ(), exact[index * 3 + 2], 0D);
+            index++;
+        }
+        assertEquals(bake.count(), index);
+    }
+
+    @Test
+    public void editedObjectsRebake() {
+        IrisObject object = object();
+        SpinKernel spin = new SpinKernel(new IrisObjectRotation(), 0, 0, 0);
+        ObjectPlacementBake before = ObjectPlacementBake.of(object, spin, false, null);
+
+        object.getBlocks().put(new IrisBlockVector(1, 1, 1), new KeyedBlockState("minecraft:dirt"));
+        ObjectPlacementBake after = ObjectPlacementBake.of(object, spin, false, null);
+
+        assertNotSame(before, after);
+        assertEquals(4, after.count());
+        assertSame(after, ObjectPlacementBake.of(object, spin, false, null));
+    }
+
+    private static IrisObject object() {
+        IrisObject object = new IrisObject(5, 5, 5);
+        KeyedBlockState stone = new KeyedBlockState("minecraft:stone");
+        object.getBlocks().put(new IrisBlockVector(-2, 0, 1), stone);
+        object.getBlocks().put(new IrisBlockVector(0, -1, 2), stone);
+        object.getBlocks().put(new IrisBlockVector(2, 2, -2), new KeyedBlockState("minecraft:oak_log[axis=y]"));
+        return object;
+    }
+}