exporting block prefabs to compressed files

docs/src/progress/renderertodo.md

@@ -1539,6 +1539,9 @@ Variable block editing size
 Increase block cursor size
 Block area selection
 
+(04/26/2025)
+Exporting block prefabs to compressed files
+
 
 
 

src/main/java/electrosphere/client/block/BlockChunkData.java

@@ -19,10 +19,16 @@ public class BlockChunkData {
      */
     public static final int TOTAL_DATA_WIDTH = CHUNK_DATA_WIDTH * CHUNK_DATA_WIDTH * CHUNK_DATA_WIDTH;
 
+    /**
+     * 2 - block type
+     * 2 - metadata
+     */
+    public static final int BYTES_PER_BLOCK = 2 * 2;
+
     /**
      * Size of a buffer that stores this chunk's data
      */
-    public static final int BUFFER_SIZE = TOTAL_DATA_WIDTH * 2 * 2;
+    public static final int BUFFER_SIZE = TOTAL_DATA_WIDTH * BYTES_PER_BLOCK;
 
     /**
      * The number of blocks to place within each unit of distance

src/main/java/electrosphere/client/block/ClientBlockSelection.java

@@ -1,10 +1,13 @@
 package electrosphere.client.block;
 
+import java.io.File;
+
 import org.joml.Vector3d;
 import org.joml.Vector3i;
 
-import electrosphere.controls.cursor.CursorState;
+import electrosphere.client.interact.select.AreaSelection;
 import electrosphere.engine.Globals;
+import electrosphere.game.data.block.BlockFab;
 
 /**
  * Class for selecting blocks on the client
@@ -68,8 +71,51 @@ public class ClientBlockSelection {
                 }
             }
         }
+        AreaSelection selection = AreaSelection.createRect(minPos, maxPos);
+        Globals.cursorState.selectRectangularArea(selection);
+    }
 
-        CursorState.selectRectangularArea(minPos, maxPos);
+    /**
+     * Exports currently selected area of voxels
+     */
+    public static void exportSelection(){
+        AreaSelection selection = Globals.cursorState.getAreaSelection();
+        Vector3i startChunk = Globals.clientWorldData.convertRealToWorldSpace(selection.getRectStart());
+        Vector3i endChunk = Globals.clientWorldData.convertRealToWorldSpace(selection.getRectEnd());
+        if(!startChunk.equals(endChunk)){
+            throw new Error("Unsupported case! Selected are coverts multiple chunks.. " + startChunk + " " + endChunk);
+        }
+        Vector3i blockStart = Globals.clientWorldData.convertRealToBlockSpace(selection.getRectStart());
+        Vector3i blockEnd = Globals.clientWorldData.convertRealToBlockSpace(selection.getRectEnd());
+
+        BlockChunkData chunk = Globals.clientBlockManager.getChunkDataAtWorldPoint(startChunk, 0);
+        if(chunk == null){
+            throw new Error("Failed to grab chunk at " + startChunk);
+        }
+
+        int blockCount = (blockEnd.x - blockStart.x) * (blockEnd.y - blockStart.y) * (blockEnd.z - blockStart.z);
+        short[] types = new short[blockCount];
+        short[] metadata = new short[blockCount];
+        int i = 0;
+        for(int x = blockStart.x; x < blockEnd.x; x++){
+            for(int y = blockStart.y; y < blockEnd.y; y++){
+                for(int z = blockStart.z; z < blockEnd.z; z++){
+                    types[i] = chunk.getType(x, y, z);
+                    metadata[i] = chunk.getMetadata(x, y, z);
+                    i++;
+                }
+            }
+        }
+
+        Vector3i dimensions = new Vector3i(
+            (blockEnd.x - blockStart.x),
+            (blockEnd.y - blockStart.y),
+            (blockEnd.z - blockStart.z)
+        );
+
+        BlockFab fab = BlockFab.create(dimensions, types, metadata);
+        File exportLoc = new File("./struct.block");
+        fab.save(exportLoc);
     }
 
 }

src/main/java/electrosphere/client/interact/select/AreaSelection.java

@@ -0,0 +1,75 @@
+package electrosphere.client.interact.select;
+
+import org.joml.Vector3d;
+
+/**
+ * An area of space that is selected by the client
+ */
+public class AreaSelection {
+    
+    /**
+     * The type of selection
+     */
+    public static enum AreaSelectionType {
+        /**
+         * A rectangle
+         */
+        RECTANGULAR,
+    }
+
+    /**
+     * The type of selection
+     */
+    private AreaSelectionType type;
+
+    /**
+     * The start point of the rectangular selection
+     */
+    private Vector3d rectStart;
+
+    /**
+     * The end point of the rectangular selection
+     */
+    private Vector3d rectEnd;
+
+    /**
+     * Creates a rectangular selection
+     * @param start The start point
+     * @param end The end point
+     * @return The selection
+     */
+    public static AreaSelection createRect(Vector3d start, Vector3d end){
+        AreaSelection rVal = new AreaSelection();
+        rVal.type = AreaSelectionType.RECTANGULAR;
+        rVal.rectStart = start;
+        rVal.rectEnd = end;
+        return rVal;
+    }
+
+    /**
+     * Gets the type of area
+     * @return The type of area
+     */
+    public AreaSelectionType getType() {
+        return type;
+    }
+
+    /**
+     * Gets the start point of the rectangular selection
+     * @return The start point
+     */
+    public Vector3d getRectStart() {
+        return rectStart;
+    }
+
+    /**
+     * Gets the end point of the rectangular selection
+     * @return The end point
+     */
+    public Vector3d getRectEnd() {
+        return rectEnd;
+    }
+
+    
+
+}

src/main/java/electrosphere/client/ui/menu/editor/ImGuiAreaTab.java

@@ -15,6 +15,9 @@ public class ImGuiAreaTab {
         if(ImGui.button("Select all voxels")){
             ClientBlockSelection.selectAllBlocks();
         }
+        if(ImGui.button("Export Selected Blocks")){
+            ClientBlockSelection.exportSelection();
+        }
     }
 
 }

src/main/java/electrosphere/controls/cursor/CursorState.java

@@ -7,6 +7,7 @@ import org.joml.Vector3i;
 
 import electrosphere.client.block.BlockChunkData;
 import electrosphere.client.entity.camera.CameraEntityUtils;
+import electrosphere.client.interact.select.AreaSelection;
 import electrosphere.collision.CollisionEngine;
 import electrosphere.engine.Globals;
 import electrosphere.engine.assetmanager.AssetDataStrings;
@@ -59,6 +60,11 @@ public class CursorState {
      */
     private int blockSize = MIN_BLOCK_SIZE;
 
+    /**
+     * The current selection of the area selector
+     */
+    private AreaSelection areaCursorSelection = null;
+
     /**
      * Creates the cursor entities
      */
@@ -154,12 +160,12 @@ public class CursorState {
 
     /**
      * Selects a rectangular area
-     * @param startPos The start position of the area
-     * @param endPos The end position of the area
+     * @param selection The area selection to encompass the cursor
      */
-    public static void selectRectangularArea(Vector3d startPos, Vector3d endPos){
-        Vector3d center = new Vector3d(startPos).add(endPos).mul(0.5f);
-        Vector3d scale = new Vector3d(startPos).sub(endPos).absolute();
+    public void selectRectangularArea(AreaSelection selection){
+        this.areaCursorSelection = selection;
+        Vector3d center = new Vector3d(areaCursorSelection.getRectStart()).add(areaCursorSelection.getRectEnd()).mul(0.5f);
+        Vector3d scale = new Vector3d(areaCursorSelection.getRectStart()).sub(areaCursorSelection.getRectEnd()).absolute();
         EntityCreationUtils.makeEntityDrawable(Globals.playerAreaCursor, AssetDataStrings.UNITCUBE);
         Actor areaCursorActor = EntityUtils.getActor(Globals.playerAreaCursor);
         areaCursorActor.addTextureMask(new ActorTextureMask("cube", Arrays.asList(new String[]{"Textures/transparent_red.png"})));
@@ -260,5 +266,13 @@ public class CursorState {
     public int getBlockSize(){
         return blockSize;
     }
+
+    /**
+     * Gets the currently selected area
+     * @return The currently selected area
+     */
+    public AreaSelection getAreaSelection(){
+        return this.areaCursorSelection;
+    }
     
 }

src/main/java/electrosphere/game/data/block/BlockFab.java

@@ -0,0 +1,85 @@
+package electrosphere.game.data.block;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.IntBuffer;
+import java.nio.ShortBuffer;
+
+import org.joml.Vector3i;
+
+import electrosphere.client.block.BlockChunkData;
+import electrosphere.util.FileUtils;
+
+/**
+ * A collection of blocks
+ */
+public class BlockFab {
+
+    /**
+     * Size of the header for a block fab file
+     * 3 * 4 for the dimensions at the front of the file
+     */
+    public static final int HEADER_SIZE = 3 * 4;
+    
+    /**
+     * Dimensions of the block fab
+     */
+    Vector3i dimensions;
+
+    /**
+     * Block type data
+     */
+    short[] types;
+
+    /**
+     * Block metadata
+     */
+    short[] metadata;
+
+    /**
+     * Creates a block fab
+     * @param dimensions The dimensions of the fab
+     * @param types The block types
+     * @param metadata The block metadata
+     * @return The block fab
+     */
+    public static BlockFab create(Vector3i dimensions, short[] types, short[] metadata){
+        BlockFab rVal = new BlockFab();
+        rVal.dimensions = dimensions;
+        rVal.types = types;
+        rVal.metadata = metadata;
+        return rVal;
+    }
+
+    /**
+     * Saves this fab to a file
+     * @param file The file
+     */
+    public void save(File file){
+        int blockCount = dimensions.x * dimensions.y * dimensions.z;
+
+
+        ByteBuffer buff = ByteBuffer.allocate(HEADER_SIZE + blockCount * BlockChunkData.BYTES_PER_BLOCK);
+
+        IntBuffer intView = buff.asIntBuffer();
+        intView.put(dimensions.x);
+        intView.put(dimensions.y);
+        intView.put(dimensions.z);
+        buff.position(HEADER_SIZE);
+        
+        ShortBuffer shortView = buff.asShortBuffer();
+
+        shortView.put(types);
+        shortView.put(metadata);
+        shortView.flip();
+
+        File exportLoc = new File("./struct.block");
+        try {
+            FileUtils.writeBufferToCompressedFile(exportLoc, buff);
+        } catch (IOException e) {
+            throw new Error("Failed to export selected blocks to a file!");
+        }
+    }
+
+}

src/main/java/electrosphere/util/FileUtils.java

@@ -33,6 +33,8 @@ import java.security.NoSuchAlgorithmException;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.GZIPOutputStream;
 
 import javax.imageio.ImageIO;
 
@@ -526,6 +528,32 @@ public class FileUtils {
         }
     }
 
+    /**
+     * Writes a ByteBuffer to a file and compresses it
+     * @param file The file
+     * @param buff The buffer
+     */
+    public static void writeBufferToCompressedFile(File file, ByteBuffer buff) throws IOException {
+        try (GZIPOutputStream outStream = new GZIPOutputStream(Files.newOutputStream(file.toPath()))){
+            outStream.write(buff.array());
+        }
+    }
+
+    /**
+     * Writes a ByteBuffer to a file and compresses it
+     * @param file The file
+     * @param buff The buffer
+     */
+    public static ByteBuffer readBufferFromCompressedFile(File file) throws IOException {
+        ByteBuffer buff = null;
+        try (GZIPInputStream inStream = new GZIPInputStream(Files.newInputStream(file.toPath()))){
+            byte[] bytes = inStream.readAllBytes();
+            buff = ByteBuffer.allocate(bytes.length);
+            buff.put(bytes);
+            buff.flip();
+        }
+        return buff;
+    }