explicit memory management of fluids

.vscode/settings.json

@@ -17,6 +17,8 @@
         "chunkmask.h": "c",
         "metadatacalc.h": "c",
         "immintrin.h": "c",
-        "stdint.h": "c"
+        "stdint.h": "c",
+        "electrosphere_server_fluid_manager_serverfluidchunk.h": "c",
+        "stdio.h": "c"
     }
 }

buildNumber.properties

@@ -1,3 +1,3 @@
 #maven.buildNumber.plugin properties file
-#Sun Dec 01 11:59:35 EST 2024
-buildNumber=449
+#Sun Dec 01 12:58:18 EST 2024
+buildNumber=462

docs/src/progress/renderertodo.md

@@ -1205,6 +1205,7 @@ Break out solver consts
 Move header file generation location
 Add more debugging tools for fluids
 Remove conditional update check in fluid sim
+Explicit memory management of fluid chunk cache buffers
 
 
 

src/fluid/compile.sh

@@ -69,16 +69,21 @@ OUTPUT_FILE="./fluidsim.o"
 gcc $COMPILE_FLAGS -I"$BASE_INCLUDE_DIR" -I"$OS_INCLUDE_DIR" $INPUT_FILES -o $OUTPUT_FILE
 
 COMPILE_FLAGS="-c -fPIC -m64 -mavx -mavx2 -march=native -Ofast -DSAVE_STEPS=$SAVE_STEPS"
-INPUT_FILES="./src/metadatacalc.c"
+INPUT_FILES="./src/metadata/metadatacalc.c"
 OUTPUT_FILE="./metadatacalc.o"
 gcc $COMPILE_FLAGS -I"$BASE_INCLUDE_DIR" -I"$OS_INCLUDE_DIR" $INPUT_FILES -o $OUTPUT_FILE
 
+COMPILE_FLAGS="-c -fPIC -m64 -mavx -mavx2 -march=native -Ofast -DSAVE_STEPS=$SAVE_STEPS"
+INPUT_FILES="./src/mem/fluidmem.c"
+OUTPUT_FILE="./fluidmem.o"
+gcc $COMPILE_FLAGS -I"$BASE_INCLUDE_DIR" -I"$OS_INCLUDE_DIR" $INPUT_FILES -o $OUTPUT_FILE
+
 
 
 #compile shared object file
 OUTPUT_FILE="libfluidsim$LIB_ENDING"
 COMPILE_FLAGS="-shared"
-INPUT_FILES="fluidsim.o javainterface.o metadatacalc.o"
+INPUT_FILES="fluidsim.o javainterface.o metadatacalc.o fluidmem.o"
 gcc $COMPILE_FLAGS $INPUT_FILES -o $OUTPUT_FILE
 
 #move to resources

src/fluid/src/mem/fluidmem.c

@@ -0,0 +1,234 @@
+#include <jni.h>
+#include <stdlib.h>
+
+#include "../../../main/c/includes/electrosphere_server_fluid_manager_ServerFluidChunk.h"
+#include "../../../main/c/includes/electrosphere_client_fluid_cache_FluidChunkData.h"
+
+/**
+ * Size of a single buffer
+ */
+#define BUFF_SIZE 18 *18 * 18 * 4
+
+/**
+ * The center position of the buffer array
+ */
+#define CENTER_POS 13
+
+
+/**
+ * Allocates the center buffer of a buffer array
+ * @param env The JNI env
+ * @param fluidObj The object containing the buffer arrays
+ * @param arrFieldId The specific field to allocate
+ */
+void allocateCenterField(JNIEnv * env, jobject fluidObj, jfieldID arrFieldId);
+
+/**
+ * Frees the center buffer of a buffer array
+ * @param env The JNI env
+ * @param fluidObj The object containing the buffer arrays
+ * @param arrFieldId The specific field to free
+ */
+void freeCenterField(JNIEnv * env, jobject fluidObj, jfieldID arrFieldId);
+
+/**
+ * Allocates the buffer of an object
+ * @param env The JNI env
+ * @param fluidObj The object containing the buffer field
+ * @param arrFieldId The specific field to allocate
+ */
+void allocateField(JNIEnv * env, jobject fluidObj, jfieldID arrFieldId);
+
+/**
+ * Frees the center buffer of a buffer array
+ * @param env The JNI env
+ * @param fluidObj The object containing the buffer arrays
+ * @param arrFieldId The specific field to free
+ */
+void freeField(JNIEnv * env, jobject fluidObj, jfieldID arrFieldId);
+
+/**
+ * Allocates the buffers for the fluid chunk
+ * @param env The JNI env
+ * @param fluidObj The fluid object
+ */
+JNIEXPORT void JNICALL Java_electrosphere_server_fluid_manager_ServerFluidChunk_allocate(
+    JNIEnv * env,
+    jobject fluidObj
+    ){
+    jclass serverFluidChunkClass = (*env)->GetObjectClass(env,fluidObj);
+    jfieldID dId = (*env)->GetFieldID(env,serverFluidChunkClass,"bWeights","[Ljava/nio/ByteBuffer;");
+    jfieldID d0Id = (*env)->GetFieldID(env,serverFluidChunkClass,"b0Weights","[Ljava/nio/ByteBuffer;");
+    jfieldID uId = (*env)->GetFieldID(env,serverFluidChunkClass,"bVelocityX","[Ljava/nio/ByteBuffer;");
+    jfieldID vId = (*env)->GetFieldID(env,serverFluidChunkClass,"bVelocityY","[Ljava/nio/ByteBuffer;");
+    jfieldID wId = (*env)->GetFieldID(env,serverFluidChunkClass,"bVelocityZ","[Ljava/nio/ByteBuffer;");
+    jfieldID u0Id = (*env)->GetFieldID(env,serverFluidChunkClass,"b0VelocityX","[Ljava/nio/ByteBuffer;");
+    jfieldID v0Id = (*env)->GetFieldID(env,serverFluidChunkClass,"b0VelocityY","[Ljava/nio/ByteBuffer;");
+    jfieldID w0Id = (*env)->GetFieldID(env,serverFluidChunkClass,"b0VelocityZ","[Ljava/nio/ByteBuffer;");
+    allocateCenterField(env,fluidObj,dId);
+    allocateCenterField(env,fluidObj,d0Id);
+    allocateCenterField(env,fluidObj,uId);
+    allocateCenterField(env,fluidObj,vId);
+    allocateCenterField(env,fluidObj,wId);
+    allocateCenterField(env,fluidObj,u0Id);
+    allocateCenterField(env,fluidObj,v0Id);
+    allocateCenterField(env,fluidObj,w0Id);
+}
+
+/**
+ * Allocates the center buffer of a buffer array
+ * @param env The JNI env
+ * @param fluidObj The object containing the buffer arrays
+ * @param arrFieldId The specific field to allocate
+ */
+void allocateCenterField(JNIEnv * env, jobject fluidObj, jfieldID arrFieldId){
+    //actually allocate
+    void *buffer = calloc(1,BUFF_SIZE);
+    if (buffer == NULL) {
+        // Handle allocation failure
+        return;
+    }
+    // Create a direct ByteBuffer
+    jobject byteBuffer = (*env)->NewDirectByteBuffer(env, buffer, BUFF_SIZE);
+    if (byteBuffer == NULL) {
+        // Handle ByteBuffer creation failure
+        free(buffer);
+        return;
+    }
+
+    //assign to array
+    jobject jd = (*env)->GetObjectField(env,fluidObj,arrFieldId);
+    (*env)->SetObjectArrayElement(env,jd,CENTER_POS,byteBuffer);
+}
+
+/**
+ * Frees the buffers for the fluid chunk
+ * @param env The JNI env
+ * @param fluidObj The fluid object
+ */
+JNIEXPORT void JNICALL Java_electrosphere_server_fluid_manager_ServerFluidChunk_free(
+    JNIEnv * env,
+    jobject fluidObj
+    ){
+    jclass serverFluidChunkClass = (*env)->GetObjectClass(env,fluidObj);
+    jfieldID dId = (*env)->GetFieldID(env,serverFluidChunkClass,"bWeights","[Ljava/nio/ByteBuffer;");
+    jfieldID d0Id = (*env)->GetFieldID(env,serverFluidChunkClass,"b0Weights","[Ljava/nio/ByteBuffer;");
+    jfieldID uId = (*env)->GetFieldID(env,serverFluidChunkClass,"bVelocityX","[Ljava/nio/ByteBuffer;");
+    jfieldID vId = (*env)->GetFieldID(env,serverFluidChunkClass,"bVelocityY","[Ljava/nio/ByteBuffer;");
+    jfieldID wId = (*env)->GetFieldID(env,serverFluidChunkClass,"bVelocityZ","[Ljava/nio/ByteBuffer;");
+    jfieldID u0Id = (*env)->GetFieldID(env,serverFluidChunkClass,"b0VelocityX","[Ljava/nio/ByteBuffer;");
+    jfieldID v0Id = (*env)->GetFieldID(env,serverFluidChunkClass,"b0VelocityY","[Ljava/nio/ByteBuffer;");
+    jfieldID w0Id = (*env)->GetFieldID(env,serverFluidChunkClass,"b0VelocityZ","[Ljava/nio/ByteBuffer;");
+    freeCenterField(env,fluidObj,dId);
+    freeCenterField(env,fluidObj,d0Id);
+    freeCenterField(env,fluidObj,uId);
+    freeCenterField(env,fluidObj,vId);
+    freeCenterField(env,fluidObj,wId);
+    freeCenterField(env,fluidObj,u0Id);
+    freeCenterField(env,fluidObj,v0Id);
+    freeCenterField(env,fluidObj,w0Id);
+}
+
+/**
+ * Frees the center buffer of a buffer array
+ * @param env The JNI env
+ * @param fluidObj The object containing the buffer arrays
+ * @param arrFieldId The specific field to free
+ */
+void freeCenterField(JNIEnv * env, jobject fluidObj, jfieldID arrFieldId){
+    //grab the buffer
+    jobject jd = (*env)->GetObjectField(env,fluidObj,arrFieldId);
+    jobject buff = (*env)->GetObjectArrayElement(env,jd,CENTER_POS);
+
+    //actually free
+    void *buffer = (*env)->GetDirectBufferAddress(env, buff);
+    if (buffer != NULL) {
+        // Free the allocated memory
+        free(buffer);
+    }
+
+    //null the array element
+    (*env)->SetObjectArrayElement(env,jd,CENTER_POS,NULL);
+}
+
+/**
+ * Allocates a fluid chunk's data
+ */
+JNIEXPORT void JNICALL Java_electrosphere_client_fluid_cache_FluidChunkData_allocate(
+    JNIEnv * env,
+    jobject fluidObj
+    ){
+    jclass fluidChunkDataClass = (*env)->GetObjectClass(env,fluidObj);
+    jfieldID dId = (*env)->GetFieldID(env,fluidChunkDataClass,"bWeights","Ljava/nio/ByteBuffer;");
+    jfieldID uId = (*env)->GetFieldID(env,fluidChunkDataClass,"bVelocityX","Ljava/nio/ByteBuffer;");
+    jfieldID vId = (*env)->GetFieldID(env,fluidChunkDataClass,"bVelocityY","Ljava/nio/ByteBuffer;");
+    jfieldID wId = (*env)->GetFieldID(env,fluidChunkDataClass,"bVelocityZ","Ljava/nio/ByteBuffer;");
+    allocateField(env,fluidObj,dId);
+    allocateField(env,fluidObj,uId);
+    allocateField(env,fluidObj,vId);
+    allocateField(env,fluidObj,wId);
+}
+
+/**
+ * Allocates the buffer of an object
+ * @param env The JNI env
+ * @param fluidObj The object containing the buffer field
+ * @param arrFieldId The specific field to allocate
+ */
+void allocateField(JNIEnv * env, jobject fluidObj, jfieldID arrFieldId){
+    //actually allocate
+    void *buffer = calloc(1,BUFF_SIZE);
+    if (buffer == NULL) {
+        // Handle allocation failure
+        return;
+    }
+    // Create a direct ByteBuffer
+    jobject byteBuffer = (*env)->NewDirectByteBuffer(env, buffer, BUFF_SIZE);
+    if (byteBuffer == NULL) {
+        // Handle ByteBuffer creation failure
+        free(buffer);
+        return;
+    }
+
+    //assign to array
+    (*env)->SetObjectField(env,fluidObj,arrFieldId,byteBuffer);
+}
+
+/**
+ * Frees a fluid chunk's data
+ */
+JNIEXPORT void JNICALL Java_electrosphere_client_fluid_cache_FluidChunkData_free(
+    JNIEnv * env,
+    jobject fluidObj
+    ){
+    jclass fluidChunkDataClass = (*env)->GetObjectClass(env,fluidObj);
+    jfieldID dId = (*env)->GetFieldID(env,fluidChunkDataClass,"bWeights","Ljava/nio/ByteBuffer;");
+    jfieldID uId = (*env)->GetFieldID(env,fluidChunkDataClass,"bVelocityX","Ljava/nio/ByteBuffer;");
+    jfieldID vId = (*env)->GetFieldID(env,fluidChunkDataClass,"bVelocityY","Ljava/nio/ByteBuffer;");
+    jfieldID wId = (*env)->GetFieldID(env,fluidChunkDataClass,"bVelocityZ","Ljava/nio/ByteBuffer;");
+    freeField(env,fluidObj,dId);
+    freeField(env,fluidObj,uId);
+    freeField(env,fluidObj,vId);
+    freeField(env,fluidObj,wId);
+}
+
+/**
+ * Frees the center buffer of a buffer array
+ * @param env The JNI env
+ * @param fluidObj The object containing the buffer arrays
+ * @param arrFieldId The specific field to free
+ */
+void freeField(JNIEnv * env, jobject fluidObj, jfieldID arrFieldId){
+    //grab the buffer
+    jobject buff = (*env)->GetObjectField(env,fluidObj,arrFieldId);
+
+    //actually free
+    void *buffer = (*env)->GetDirectBufferAddress(env, buff);
+    if (buffer != NULL) {
+        // Free the allocated memory
+        free(buffer);
+    }
+
+    //null the array element
+    (*env)->SetObjectField(env,fluidObj,arrFieldId,NULL);
+}

src/fluid/src/metadata/metadatacalc.c

@@ -2,9 +2,9 @@
 #include <stdint.h>
 #include <math.h>
 
-#include "../includes/utilities.h"
-#include "../includes/chunkmask.h"
-#include "../includes/metadatacalc.h"
+#include "../../includes/utilities.h"
+#include "../../includes/chunkmask.h"
+#include "../../includes/metadatacalc.h"
 
 #define UPDATE_THRESHOLD 0.1
 

src/main/c/includes/electrosphere_client_fluid_cache_FluidChunkData.h

@@ -0,0 +1,33 @@
+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+/* Header for class electrosphere_client_fluid_cache_FluidChunkData */
+
+#ifndef _Included_electrosphere_client_fluid_cache_FluidChunkData
+#define _Included_electrosphere_client_fluid_cache_FluidChunkData
+#ifdef __cplusplus
+extern "C" {
+#endif
+#undef electrosphere_client_fluid_cache_FluidChunkData_CHUNK_SIZE
+#define electrosphere_client_fluid_cache_FluidChunkData_CHUNK_SIZE 18L
+#undef electrosphere_client_fluid_cache_FluidChunkData_CHUNK_DATA_GENERATOR_SIZE
+#define electrosphere_client_fluid_cache_FluidChunkData_CHUNK_DATA_GENERATOR_SIZE 17L
+/*
+ * Class:     electrosphere_client_fluid_cache_FluidChunkData
+ * Method:    allocate
+ * Signature: ()V
+ */
+JNIEXPORT void JNICALL Java_electrosphere_client_fluid_cache_FluidChunkData_allocate
+  (JNIEnv *, jobject);
+
+/*
+ * Class:     electrosphere_client_fluid_cache_FluidChunkData
+ * Method:    free
+ * Signature: ()V
+ */
+JNIEXPORT void JNICALL Java_electrosphere_client_fluid_cache_FluidChunkData_free
+  (JNIEnv *, jobject);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

src/main/c/includes/electrosphere_server_fluid_manager_ServerFluidChunk.h

@@ -0,0 +1,43 @@
+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+/* Header for class electrosphere_server_fluid_manager_ServerFluidChunk */
+
+#ifndef _Included_electrosphere_server_fluid_manager_ServerFluidChunk
+#define _Included_electrosphere_server_fluid_manager_ServerFluidChunk
+#ifdef __cplusplus
+extern "C" {
+#endif
+#undef electrosphere_server_fluid_manager_ServerFluidChunk_ARRAY_CT
+#define electrosphere_server_fluid_manager_ServerFluidChunk_ARRAY_CT 27L
+#undef electrosphere_server_fluid_manager_ServerFluidChunk_CENTER_BUFF
+#define electrosphere_server_fluid_manager_ServerFluidChunk_CENTER_BUFF 13L
+#undef electrosphere_server_fluid_manager_ServerFluidChunk_TRUE_DATA_DIM
+#define electrosphere_server_fluid_manager_ServerFluidChunk_TRUE_DATA_DIM 16L
+#undef electrosphere_server_fluid_manager_ServerFluidChunk_TRUE_DATA_GENERATOR_SIZE
+#define electrosphere_server_fluid_manager_ServerFluidChunk_TRUE_DATA_GENERATOR_SIZE 17L
+#undef electrosphere_server_fluid_manager_ServerFluidChunk_TRUE_DATA_OFFSET
+#define electrosphere_server_fluid_manager_ServerFluidChunk_TRUE_DATA_OFFSET 1L
+#undef electrosphere_server_fluid_manager_ServerFluidChunk_BUFFER_DIM
+#define electrosphere_server_fluid_manager_ServerFluidChunk_BUFFER_DIM 18L
+#undef electrosphere_server_fluid_manager_ServerFluidChunk_BUFFER_SIZE
+#define electrosphere_server_fluid_manager_ServerFluidChunk_BUFFER_SIZE 5832L
+/*
+ * Class:     electrosphere_server_fluid_manager_ServerFluidChunk
+ * Method:    allocate
+ * Signature: ()V
+ */
+JNIEXPORT void JNICALL Java_electrosphere_server_fluid_manager_ServerFluidChunk_allocate
+  (JNIEnv *, jobject);
+
+/*
+ * Class:     electrosphere_server_fluid_manager_ServerFluidChunk
+ * Method:    free
+ * Signature: ()V
+ */
+JNIEXPORT void JNICALL Java_electrosphere_server_fluid_manager_ServerFluidChunk_free
+  (JNIEnv *, jobject);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

src/main/java/electrosphere/client/fluid/cache/ClientFluidCache.java

@@ -36,8 +36,9 @@ public class ClientFluidCache {
     public void addChunkDataToCache(int worldX, int worldY, int worldZ, FluidChunkData chunkData){
         cacheMap.put(getKey(worldX,worldY,worldZ),chunkData);
         while(cacheList.size() > cacheSize){
-            String currentChunk = cacheList.remove(0);
-            cacheMap.remove(currentChunk);
+            String currentKey = cacheList.remove(0);
+            FluidChunkData currentChunk = cacheMap.remove(currentKey);
+            currentChunk.freeBuffers();
         }
     }
     

src/main/java/electrosphere/client/fluid/cache/FluidChunkData.java

@@ -1,5 +1,9 @@
 package electrosphere.client.fluid.cache;
 
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.FloatBuffer;
+
 import org.joml.Vector3i;
 
 import electrosphere.server.fluid.manager.ServerFluidChunk;
@@ -14,30 +18,76 @@ public class FluidChunkData {
     //The size of the data passed into marching cubes/transvoxel algorithm to get a fully connected and seamless chunk
     public static final int CHUNK_DATA_GENERATOR_SIZE = ServerFluidChunk.TRUE_DATA_GENERATOR_SIZE;
 
-    //How much of that fluid type is in this voxel
-    float[][][] voxelWeight;
+    /**
+     * The float view of the center weight buffer
+     */
+    FloatBuffer weights = null;
 
-    //The velocities
-    float[][][] velocityX;
-    float[][][] velocityY;
-    float[][][] velocityZ;
+    /**
+     * The float view of the center velocity x buffer
+     */
+    FloatBuffer velocityX = null;
+
+    /**
+     * The float view of the center velocity y buffer
+     */
+    FloatBuffer velocityY = null;
+
+    /**
+     * The float view of the center velocity z buffer
+     */
+    FloatBuffer velocityZ = null;
+
+    /**
+     * The array of all adjacent weight buffers for the fluid sim
+     */
+    public ByteBuffer bWeights = null;
+
+    /**
+     * The array of all adjacent velocity x buffers for the fluid sim
+     */
+    public ByteBuffer bVelocityX = null;
+
+    /**
+     * The array of all adjacent velocity y buffers for the fluid sim
+     */
+    public ByteBuffer bVelocityY = null;
+
+    /**
+     * The array of all adjacent velocity z buffers for the fluid sim
+     */
+    public ByteBuffer bVelocityZ = null;
 
 
     /**
-     * Gets the voxel weight array in this container
-     * @return The voxel weight array
+     * Constructor
      */
-    public float[][][] getVoxelWeight(){
-        return voxelWeight;
+    public FluidChunkData(){
+        //allocate buffers
+        this.allocate();
+
+        //reorder
+        this.bWeights.order(ByteOrder.LITTLE_ENDIAN);
+        this.bVelocityX.order(ByteOrder.LITTLE_ENDIAN);
+        this.bVelocityY.order(ByteOrder.LITTLE_ENDIAN);
+        this.bVelocityZ.order(ByteOrder.LITTLE_ENDIAN);
+
+        //get float view
+        this.weights = this.bWeights.asFloatBuffer();
+        this.velocityX = this.bVelocityX.asFloatBuffer();
+        this.velocityY = this.bVelocityY.asFloatBuffer();
+        this.velocityZ = this.bVelocityZ.asFloatBuffer();
     }
 
     /**
-     * Sets the voxel weight array in this container
-     * @param voxelWeight The voxel weight array
+     * Gets the inddex into the buffer
+     * @param x The x position
+     * @param y The y position
+     * @param z The z position
+     * @return The index
      */
-    public void setVoxelWeight(float[][][] voxelWeight){
-        //update data
-        this.voxelWeight = voxelWeight;
+    public int IX(int x, int y, int z){
+        return x * ServerFluidChunk.BUFFER_DIM * ServerFluidChunk.BUFFER_DIM + y * ServerFluidChunk.BUFFER_DIM  + z;
     }
 
     /**
@@ -46,7 +96,7 @@ public class FluidChunkData {
      * @return The weight of the specified voxel
      */
     public float getWeight(Vector3i localPosition){
-        return voxelWeight[localPosition.x][localPosition.y][localPosition.z];
+        return weights.get(this.IX(localPosition.x,localPosition.y,localPosition.z));
     }
 
     /**
@@ -54,7 +104,92 @@ public class FluidChunkData {
      * @return The weight of the specified voxel
      */
     public float getWeight(int x, int y, int z){
-        return voxelWeight[x][y][z];
+        return weights.get(this.IX(x,y,z));
+    }
+
+    /**
+     * Sets the weight at a given position
+     * @param x The x coordinate
+     * @param y The y coordinate
+     * @param z The z coordinate
+     * @param weight The weight
+     */
+    public void setWeight(int x, int y, int z, float weight){
+        weights.put(this.IX(x,y,z),weight);
+    }
+
+    /**
+     * Gets the x velocity of a voxel at a poisiton
+     * @return The x velocity of the specified voxel
+     */
+    public float getVelocityX(int x, int y, int z){
+        return velocityX.get(this.IX(x,y,z));
+    }
+
+    /**
+     * Sets the x velocity at a given position
+     * @param x The x coordinate
+     * @param y The y coordinate
+     * @param z The z coordinate
+     * @param vel The x velocity
+     */
+    public void setVelocityX(int x, int y, int z, float vel){
+        velocityX.put(this.IX(x,y,z),vel);
+    }
+
+    /**
+     * Gets the y velocity of a voxel at a poisiton
+     * @return The y velocity of the specified voxel
+     */
+    public float getVelocityY(int x, int y, int z){
+        return velocityY.get(this.IX(x,y,z));
+    }
+
+    /**
+     * Sets the y velocity at a given position
+     * @param x The x coordinate
+     * @param y The y coordinate
+     * @param z The z coordinate
+     * @param vel The y velocity
+     */
+    public void setVelocityY(int x, int y, int z, float vel){
+        velocityY.put(this.IX(x,y,z),vel);
+    }
+
+    /**
+     * Gets the z velocity of a voxel at a poisiton
+     * @return The z velocity of the specified voxel
+     */
+    public float getVelocityZ(int x, int y, int z){
+        return velocityZ.get(this.IX(x,y,z));
+    }
+
+    /**
+     * Sets the z velocity at a given position
+     * @param x The x coordinate
+     * @param y The y coordinate
+     * @param z The z coordinate
+     * @param vel The z velocity
+     */
+    public void setVelocityZ(int x, int y, int z, float vel){
+        velocityZ.put(this.IX(x,y,z),vel);
+    }
+
+    /**
+     * Allocates the buffers for this chunk
+     */
+    private native void allocate();
+
+    /**
+     * Frees all native memory
+     */
+    private native void free();
+
+    /**
+     * Frees the buffers contained within this chunk
+     */
+    public void freeBuffers(){
+        this.free();
     }
 
 }

src/main/java/electrosphere/client/fluid/manager/ClientFluidManager.java

@@ -177,17 +177,14 @@ public class ClientFluidManager {
      * @return the object
      */
     private FluidChunkData parseFluidDataBuffer(ByteBuffer buffer){
-        float[][][] weights = new float[FluidChunkData.CHUNK_SIZE][FluidChunkData.CHUNK_SIZE][FluidChunkData.CHUNK_SIZE];
-        float[][][] velocityX = new float[FluidChunkData.CHUNK_SIZE][FluidChunkData.CHUNK_SIZE][FluidChunkData.CHUNK_SIZE];
-        float[][][] velocityY = new float[FluidChunkData.CHUNK_SIZE][FluidChunkData.CHUNK_SIZE][FluidChunkData.CHUNK_SIZE];
-        float[][][] velocityZ = new float[FluidChunkData.CHUNK_SIZE][FluidChunkData.CHUNK_SIZE][FluidChunkData.CHUNK_SIZE];
+        FluidChunkData data = new FluidChunkData();
         FloatBuffer floatBuffer = buffer.asFloatBuffer();
         for(int x = 0; x < FluidChunkData.CHUNK_SIZE; x++){
             for(int y = 0; y < FluidChunkData.CHUNK_SIZE; y++){
                 for(int z = 0; z < FluidChunkData.CHUNK_SIZE; z++){
-                    weights[x][y][z] = floatBuffer.get();
-                    if(weights[x][y][z] <= 0){
-                        weights[x][y][z] = FluidCell.ISO_SURFACE_EMPTY;
+                    data.setWeight(x,y,z,floatBuffer.get());
+                    if(data.getWeight(x, y, z) <= 0){
+                        data.setWeight(x, y, z, FluidCell.ISO_SURFACE_EMPTY);
                     }
                 }
             }
@@ -195,26 +192,25 @@ public class ClientFluidManager {
         for(int x = 0; x < FluidChunkData.CHUNK_SIZE; x++){
             for(int y = 0; y < FluidChunkData.CHUNK_SIZE; y++){
                 for(int z = 0; z < FluidChunkData.CHUNK_SIZE; z++){
-                    velocityX[x][y][z] = floatBuffer.get();
+                    data.setVelocityX(x, y, z, floatBuffer.get());
                 }
             }
         }
         for(int x = 0; x < FluidChunkData.CHUNK_SIZE; x++){
             for(int y = 0; y < FluidChunkData.CHUNK_SIZE; y++){
                 for(int z = 0; z < FluidChunkData.CHUNK_SIZE; z++){
-                    velocityY[x][y][z] = floatBuffer.get();
+                    data.setVelocityY(x, y, z, floatBuffer.get());
                 }
             }
         }
         for(int x = 0; x < FluidChunkData.CHUNK_SIZE; x++){
             for(int y = 0; y < FluidChunkData.CHUNK_SIZE; y++){
                 for(int z = 0; z < FluidChunkData.CHUNK_SIZE; z++){
-                    velocityZ[x][y][z] = floatBuffer.get();
+                    data.setVelocityZ(x, y, z, floatBuffer.get());
                 }
             }
         }
-        FluidChunkData data = new FluidChunkData();
-        data.setVoxelWeight(weights);
+        // data.setVoxelWeight(weights);
         return data;
     }
 

src/main/java/electrosphere/server/fluid/manager/ServerFluidChunk.java

@@ -154,14 +154,7 @@ public class ServerFluidChunk {
         this.worldZ = worldZ;
 
         //allocate
-        this.bWeights[CENTER_BUFF] = ByteBuffer.allocateDirect(BUFFER_SIZE * 4);
-        this.bVelocityX[CENTER_BUFF] = ByteBuffer.allocateDirect(BUFFER_SIZE * 4);
-        this.bVelocityY[CENTER_BUFF] = ByteBuffer.allocateDirect(BUFFER_SIZE * 4);
-        this.bVelocityZ[CENTER_BUFF] = ByteBuffer.allocateDirect(BUFFER_SIZE * 4);
-        this.b0Weights[CENTER_BUFF] = ByteBuffer.allocateDirect(BUFFER_SIZE * 4);
-        this.b0VelocityX[CENTER_BUFF] = ByteBuffer.allocateDirect(BUFFER_SIZE * 4);
-        this.b0VelocityY[CENTER_BUFF] = ByteBuffer.allocateDirect(BUFFER_SIZE * 4);
-        this.b0VelocityZ[CENTER_BUFF] = ByteBuffer.allocateDirect(BUFFER_SIZE * 4);
+        this.allocate();
 
         //order
         this.bWeights[CENTER_BUFF].order(ByteOrder.LITTLE_ENDIAN);
@@ -467,4 +460,21 @@ public class ServerFluidChunk {
         }
     }
 
+    /**
+     * Allocates the central arrays for this chunk
+     */
+    private native void allocate();
+
+    /**
+     * Frees all native memory
+     */
+    private native void free();
+
+    /**
+     * Frees the buffers contained within this chunk
+     */
+    public void freeBuffers(){
+        this.free();
+    }
+
 }

src/main/java/electrosphere/server/fluid/manager/ServerFluidManager.java

@@ -70,7 +70,7 @@ public class ServerFluidManager {
     ServerTerrainManager serverTerrainManager;
 
     //controls whether fluid simulation should actually happen or not
-    boolean simulate = true;
+    boolean simulate = false;
 
     @Exclude
     /**
@@ -217,8 +217,10 @@ public class ServerFluidManager {
             returnedChunk = chunkCache.get(key);
         } else {
             if(chunkCacheContents.size() > cacheSize){
-                String oldChunk = chunkCacheContents.remove(chunkCacheContents.size() - 1);
-                chunkCache.remove(oldChunk);
+                String oldChunkKey = chunkCacheContents.remove(chunkCacheContents.size() - 1);
+                ServerFluidChunk oldChunk = chunkCache.remove(oldChunkKey);
+                oldChunk.freeBuffers();
+                this.linkNeighbors(null, oldChunk.getWorldX(), oldChunk.getWorldY(), oldChunk.getWorldZ());
             }
             //pull from disk if it exists
             if(chunkDiskMap != null){
@@ -351,7 +353,9 @@ public class ServerFluidManager {
                     ){
                         key = this.getKey(worldX + i,worldY +j,worldZ + k);
                         ServerFluidChunk neighbor = this.chunkCache.get(key);
+                        if(current != null){
                             current.setNeighbor(i+1,j+1,k+1,neighbor);
+                        }
                         if(neighbor != null){
                             neighbor.setNeighbor(1-i,1-j,1-k,current);
                         }