add TopLocator

common/addons/config-locators/src/main/java/com/dfsek/terra/addons/feature/locator/LocatorAddon.java

@@ -20,6 +20,7 @@ import com.dfsek.terra.addons.feature.locator.config.OrLocatorTemplate;
 import com.dfsek.terra.addons.feature.locator.config.PatternLocatorTemplate;
 import com.dfsek.terra.addons.feature.locator.config.RandomLocatorTemplate;
 import com.dfsek.terra.addons.feature.locator.config.SurfaceLocatorTemplate;
+import com.dfsek.terra.addons.feature.locator.config.TopLocatorTemplate;
 import com.dfsek.terra.addons.feature.locator.config.XorLocatorTemplate;
 import com.dfsek.terra.addons.feature.locator.config.pattern.AirMatchPatternTemplate;
 import com.dfsek.terra.addons.feature.locator.config.pattern.AndPatternTemplate;
@@ -60,7 +61,8 @@ public class LocatorAddon implements AddonInitializer {
                 .register(addon, ConfigPackPreLoadEvent.class)
                 .then(event -> {
                     CheckedRegistry<Supplier<ObjectTemplate<Locator>>> locatorRegistry = event.getPack().getOrCreateRegistry(LOCATOR_TOKEN);
-                    locatorRegistry.register(addon.key("SURFACE"), () -> new SurfaceLocatorTemplate(platform));
+                    locatorRegistry.register(addon.key("SURFACE"), SurfaceLocatorTemplate::new);
+                    locatorRegistry.register(addon.key("TOP"), TopLocatorTemplate::new);
                     
                     locatorRegistry.register(addon.key("RANDOM"), RandomLocatorTemplate::new);
                     locatorRegistry.register(addon.key("GAUSSIAN_RANDOM"), GaussianRandomLocatorTemplate::new);

common/addons/config-locators/src/main/java/com/dfsek/terra/addons/feature/locator/config/TopLocatorTemplate.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2020-2021 Polyhedral Development
+ *
+ * The Terra Core Addons are licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in this module's root directory.
+ */
+
+package com.dfsek.terra.addons.feature.locator.config;
+
+import com.dfsek.tectonic.api.config.template.annotations.Value;
+import com.dfsek.tectonic.api.config.template.object.ObjectTemplate;
+
+import com.dfsek.terra.addons.feature.locator.locators.SurfaceLocator;
+import com.dfsek.terra.addons.feature.locator.locators.TopLocator;
+import com.dfsek.terra.api.Platform;
+import com.dfsek.terra.api.config.meta.Meta;
+import com.dfsek.terra.api.structure.feature.Locator;
+import com.dfsek.terra.api.util.Range;
+
+
+public class TopLocatorTemplate implements ObjectTemplate<Locator> {
+    
+    @Value("range")
+    private @Meta Range range;
+    
+    @Override
+    public Locator get() {
+        return new TopLocator(range);
+    }
+}

common/addons/config-locators/src/main/java/com/dfsek/terra/addons/feature/locator/locators/TopLocator.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2020-2021 Polyhedral Development
+ *
+ * The Terra Core Addons are licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in this module's root directory.
+ */
+
+package com.dfsek.terra.addons.feature.locator.locators;
+
+import com.dfsek.terra.api.structure.feature.BinaryColumn;
+import com.dfsek.terra.api.structure.feature.Locator;
+import com.dfsek.terra.api.util.Range;
+import com.dfsek.terra.api.world.chunk.generation.util.Column;
+
+
+public class TopLocator implements Locator {
+    private final Range search;
+    
+    public TopLocator(Range search) {
+        this.search = search;
+    }
+    
+    @Override
+    public BinaryColumn getSuitableCoordinates(Column<?> column) {
+        BinaryColumn location = new BinaryColumn(column.getMinY(), column.getMaxY());
+        for(int y : search) {
+            if(column.getBlock(y).isAir() && !column.getBlock(y - 1).isAir()) {
+                location.set(y);
+                return location;
+            }
+        }
+        return location;
+    }
+}