Refactor utils package

3 files changed, 79 insertions, 0 deletions

diff --git a/src/main/java/me/xmrvizzy/skyblocker/utils/render/culling/OcclusionCulling.java b/src/main/java/me/xmrvizzy/skyblocker/utils/render/culling/OcclusionCulling.java
new file mode 100644
index 00000000..5c7f69ad
--- /dev/null
+++ b/src/main/java/me/xmrvizzy/skyblocker/utils/render/culling/OcclusionCulling.java
@@ -0,0 +1,47 @@
+package me.xmrvizzy.skyblocker.utils.render.culling;
+
+import com.logisticscraft.occlusionculling.OcclusionCullingInstance;
+import com.logisticscraft.occlusionculling.cache.ArrayOcclusionCache;
+import com.logisticscraft.occlusionculling.util.Vec3d;
+import me.xmrvizzy.skyblocker.utils.render.FrustumUtils;
+import net.minecraft.client.MinecraftClient;
+
+public class OcclusionCulling {
+	private static final int TRACING_DISTANCE = 128;
+	private static final MinecraftClient CLIENT = MinecraftClient.getInstance();
+	private static OcclusionCullingInstance instance = null;
+
+	// Reused objects to reduce allocation overhead
+	private static final Vec3d cameraPos = new Vec3d(0, 0, 0);
+	private static final Vec3d min = new Vec3d(0, 0, 0);
+	private static final Vec3d max = new Vec3d(0, 0, 0);
+
+	/**
+	 * Initializes the occlusion culling instance
+	 */
+	public static void init() {
+		instance = new OcclusionCullingInstance(TRACING_DISTANCE, new WorldProvider(), new ArrayOcclusionCache(TRACING_DISTANCE), 2);
+	}
+
+	private static void updateCameraPos() {
+		var camera = CLIENT.gameRenderer.getCamera().getPos();
+		cameraPos.set(camera.x, camera.y, camera.z);
+	}
+
+	/**
+	 * This first checks checks if the bounding box is within the camera's FOV, if
+	 * it is then it checks for whether it's occluded or not.
+	 * 
+	 * @return A boolean representing whether the bounding box is fully visible or
+	 *         not.
+	 */
+	public static boolean isVisible(double x1, double y1, double z1, double x2, double y2, double z2) {
+		if (!FrustumUtils.isVisible(x1, y1, z1, x2, y2, z2)) return false;
+
+		updateCameraPos();
+		min.set(x1, y1, z1);
+		max.set(x2, y2, z2);
+
+		return instance.isAABBVisible(min, max, cameraPos);
+	}
+}
diff --git a/src/main/java/me/xmrvizzy/skyblocker/utils/render/culling/WorldProvider.java b/src/main/java/me/xmrvizzy/skyblocker/utils/render/culling/WorldProvider.java
new file mode 100644
index 00000000..09a7bc79
--- /dev/null
+++ b/src/main/java/me/xmrvizzy/skyblocker/utils/render/culling/WorldProvider.java
@@ -0,0 +1,28 @@
+package me.xmrvizzy.skyblocker.utils.render.culling;
+
+import com.logisticscraft.occlusionculling.DataProvider;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.world.ClientWorld;
+import net.minecraft.util.math.BlockPos;
+
+public class WorldProvider implements DataProvider {
+	private final static MinecraftClient CLIENT = MinecraftClient.getInstance();
+	private ClientWorld world = null;
+
+	@Override
+	public boolean prepareChunk(int chunkX, int chunkZ) {
+		this.world = CLIENT.world;
+		return this.world != null;
+	}
+
+	@Override
+	public boolean isOpaqueFullCube(int x, int y, int z) {
+		BlockPos pos = new BlockPos(x, y, z);
+		return this.world.getBlockState(pos).isOpaqueFullCube(this.world, pos);
+	}
+
+	@Override
+	public void cleanup() {
+		this.world = null;
+	}
+}
diff --git a/src/main/java/me/xmrvizzy/skyblocker/utils/render/culling/package-info.java b/src/main/java/me/xmrvizzy/skyblocker/utils/render/culling/package-info.java
new file mode 100644
index 00000000..97ebac86
--- /dev/null
+++ b/src/main/java/me/xmrvizzy/skyblocker/utils/render/culling/package-info.java
@@ -0,0 +1,4 @@
+/**
+ * Package dedicated to occlusion culling utilities
+ */
+package me.xmrvizzy.skyblocker.utils.render.culling;
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