Fix one more issue with transparency plus optimize memory usage a bit

core/src/ru/mclord/classic/Block.java

@@ -1,5 +1,7 @@
 package ru.mclord.classic;
 
+import com.badlogic.gdx.graphics.Pixmap;
+import com.badlogic.gdx.graphics.Texture;
 import com.badlogic.gdx.graphics.g3d.Model;
 import com.badlogic.gdx.graphics.g3d.attributes.FloatAttribute;
 import com.badlogic.gdx.utils.Disposable;
@@ -52,6 +54,7 @@ public boolean doIHaveThisPermission() {
     private Model model;
     private boolean alphaTestEnabled = true;
     private float alphaTestValue = 0.5f;
+    /* package-private */ boolean hasSomeTransparency;
 
     public Block(
             short id,
@@ -122,16 +125,43 @@ public void initGraphics() {
         TextureManager manager = TextureManager.getInstance();
 
         model = Helper.constructBlock(0.5f,
-                manager.getTexture(frontTextureId),
-                manager.getTexture(backTextureId),
-                manager.getTexture(bottomTextureId),
-                manager.getTexture(topTextureId),
-                manager.getTexture(leftTextureId),
-                manager.getTexture(rightTextureId),
+                checkTransparency(manager.getTexture(frontTextureId)),
+                checkTransparency(manager.getTexture(backTextureId)),
+                checkTransparency(manager.getTexture(bottomTextureId)),
+                checkTransparency(manager.getTexture(topTextureId)),
+                checkTransparency(manager.getTexture(leftTextureId)),
+                checkTransparency(manager.getTexture(rightTextureId)),
                 (alphaTestEnabled ? FloatAttribute.createAlphaTest(alphaTestValue) : null)
         );
     }
 
+    private Texture checkTransparency(Texture texture) {
+        if (hasSomeTransparency) return texture;
+
+        boolean wasNotPrepared = false;
+        if (!texture.getTextureData().isPrepared()) {
+            texture.getTextureData().prepare();
+
+            wasNotPrepared = true;
+        }
+        Pixmap pixmap = texture.getTextureData().consumePixmap();
+        if (wasNotPrepared) {
+            TextureManager.getInstance().addTemporaryPixmap(pixmap);
+        }
+        for (int i = 0; i < pixmap.getWidth(); i++) {
+            for (int j = 0; j < pixmap.getHeight(); j++) {
+                byte alpha = (byte) (pixmap.getPixel(i, j) & 0xFF);
+                if (alpha != -1) {
+                    hasSomeTransparency = true;
+
+                    return texture;
+                }
+            }
+        }
+
+        return texture;
+    }
+
     public final Model getModel() {
         return model;
     }
@@ -194,7 +224,8 @@ public boolean shouldBeRenderedAt(int x, int y, int z) {
         neighbors[4] = level.getBlockDefAt(x, y + 1, z);
         neighbors[5] = level.getBlockDefAt(x, y - 1, z);
         for (Block neighbor : neighbors) {
-            if (neighbor.solidity != Solidity.SOLID || neighbor.slab) return true;
+            if (neighbor.solidity != Solidity.SOLID ||
+                    neighbor.slab || neighbor.hasSomeTransparency) return true;
         }
 
         return false;

core/src/ru/mclord/classic/BlockManager.java

@@ -39,8 +39,9 @@ public void registerBlock(Block block) {
             throw new IllegalArgumentException(
                     "Specified block ID (" + block.id + ") is already registered");
         }
-
         REGISTERED_BLOCKS.put(block.id, block);
+
+        block.onBlockRegister();
     }
 
     @ShouldBeCalledBy(thread = "main")

core/src/ru/mclord/classic/Chunk.java

@@ -60,9 +60,10 @@ public void initGraphics() {
             for (int y = 0; y < level.sizeY; y++) {
                 for (int z = realZ; z < realZ + CHUNK_SIZE; z++) {
                     Block block = level.getBlockDefAt(x, y, z);
+                    block.initGraphics();
+
                     if (!block.shouldBeRenderedAt(x, y, z)) continue;
 
-                    block.initGraphics();
                     ModelInstance modelInstance = new ModelInstance(block.getModel(),
                             (new Matrix4()).translate(x, y, z), (String[]) null);
                     modelCache.add(modelInstance);

core/src/ru/mclord/classic/Helper.java

@@ -164,6 +164,12 @@ public static Model constructBlock(
         return model;
     }
 
+    /* package-private */ static void disposeBlocks() {
+        for (Block block : BlockManager.getInstance().enumerateBlocksFast()) {
+            block.dispose();
+        }
+    }
+
     // thanks to https://stackoverflow.com/a/18157551
     public static float distanceSquared(Chunk chunk, float pointX, float pointZ) {
         int realChunkX = Chunk.getX(chunk);

core/src/ru/mclord/classic/Level.java

@@ -49,6 +49,7 @@ public void initGraphics() {
                 chunks.put(Pair.of(chunkX, chunkZ), chunk);
             }
         }
+        Helper.disposeBlocks();
 
         graphicsInitialized = true;
     }

core/src/ru/mclord/classic/McLordClassic.java

@@ -55,8 +55,8 @@ public enum GameStage {
 
 	public static final boolean DEBUG = true;
 	public static final String APP_NAME = "McLordClassic";
-	public static final String VERSION = "0.1.5";
-	public static final int VERSION_CODE = 5;
+	public static final String VERSION = "0.1.6";
+	public static final int VERSION_CODE = 6;
 
 	private static final McLordClassic INSTANCE = new McLordClassic();
 
@@ -297,9 +297,7 @@ public void dispose() {
 		PluginManager.getInstance().disablePlugins();
 
 		Helper.dispose(level); level = null;
-		for (Block block : BlockManager.getInstance().enumerateBlocksFast()) {
-			block.dispose();
-		}
+		Helper.disposeBlocks();
 		TextureManager.getInstance().dispose();
 
 		System.out.println("Goodbye!");

core/src/ru/mclord/classic/TextureManager.java

@@ -186,6 +186,14 @@ public static int textureColorFrom(int bufferedImageColor) {
         return bufferedImageColor;
     }
 
+    public void addTemporaryPixmap(Pixmap pixmap) {
+        temporaryPixmaps.add(pixmap);
+    }
+
+    public void addTemporaryTexture(Texture texture) {
+        temporaryTextures.add(texture);
+    }
+
     public void walk(
             Texture[] textures,
             List<Pixmap> temporaryPixmaps,

desktop/src/ru/mclord/classic/DesktopLauncher.java

@@ -49,7 +49,7 @@ public static void main(String[] arg) throws IOException {
 		config.useVsync(vsync);
 		config.disableAudio(!audio);
 		config.setHdpiMode(hdpiMode);
-		config.setTitle("McLordClassic");
+		config.setTitle("McLordClassic v" + McLordClassic.VERSION);
 		config.setWindowIcon();
 
 		new Lwjgl3Application(McLordClassic.game().linkProperties(props), config);