Optimized tile render and added CRO tile support

- CROs now support tiles
  - CROCube refactored
- Test content:
  - Added sand and flower tiles
  - Removed grass blocks, added grass tiles

src/main/java/ru/windcorp/progressia/client/world/ChunkRender.java

@@ -19,13 +19,13 @@ package ru.windcorp.progressia.client.world;
 
 import java.util.Collection;
 import java.util.List;
+import java.util.Objects;
 import java.util.stream.Collectors;
 
 import glm.mat._4.Mat4;
 import glm.vec._3.Vec3;
 import glm.vec._3.i.Vec3i;
 import ru.windcorp.progressia.client.graphics.model.Model;
-import ru.windcorp.progressia.client.graphics.model.Shape;
 import ru.windcorp.progressia.client.graphics.model.ShapeRenderHelper;
 import ru.windcorp.progressia.client.graphics.model.StaticModel;
 import ru.windcorp.progressia.client.graphics.model.WorldRenderable;
@@ -114,12 +114,10 @@ public class ChunkRender {
 			}
 		}
 		
-		for (ChunkRenderOptimizer optimizer : optimizers) {
-			Shape result = optimizer.endRender();
-			if (result != null) {
-				builder.addPart(result);
-			}
-		}
+		optimizers.stream()
+				.map(ChunkRenderOptimizer::endRender)
+				.filter(Objects::nonNull)
+				.forEach(builder::addPart);
 		
 		model = new StaticModel(builder);
 		needsUpdate = false;
@@ -131,55 +129,41 @@ public class ChunkRender {
 			Builder builder
 	) {
 		BlockRender block = getBlock(cursor);
-		int x = cursor.x;
-		int y = cursor.y;
-		int z = cursor.z;
 		
 		if (block instanceof BlockRenderNone) {
 			return;
 		}
 		
-		forwardBlockToOptimizers(block, x, y, z, optimizers);
+		forwardBlockToOptimizers(block, cursor, optimizers);
 		
 		if (!block.needsOwnRenderable()) {
 			return;
 		}
 		
-		if (tryToCreateBlockRenderable(block, x, y, z, builder)) {
-			return;
-		}
-		
-		addBlockRenderAsRenderable(block, x, y, z, builder);
+		addBlockRenderable(block, cursor, builder);
 	}
 
 	private void forwardBlockToOptimizers(
-			BlockRender block, int x, int y, int z,
+			BlockRender block, Vec3i cursor,
 			Collection<ChunkRenderOptimizer> optimizers
 	) {
-		optimizers.forEach(bro -> bro.processBlock(block, x, y, z));
+		optimizers.forEach(cro -> cro.processBlock(block, cursor));
 	}
 	
-	private boolean tryToCreateBlockRenderable(
-			BlockRender block, int x, int y, int z,
+	private void addBlockRenderable(
+			BlockRender block,
+			Vec3i cursor,
 			Builder builder
 	) {
 		WorldRenderable renderable = block.createRenderable();
 		
 		if (renderable == null) {
-			return false;
+			renderable = block::render;
 		}
 		
-		builder.addPart(renderable, new Mat4().identity().translate(x, y, z));
-		return true;
-	}
-
-	private void addBlockRenderAsRenderable(
-			BlockRender block, int x, int y, int z,
-			Builder builder
-	) {
 		builder.addPart(
-				block::render,
-				new Mat4().identity().translate(x, y, z)
+				renderable,
+				new Mat4().identity().translate(cursor.x, cursor.y, cursor.z)
 		);
 	}
 
@@ -230,6 +214,13 @@ public class ChunkRender {
 		
 		Vec3 pos = Vectors.grab3().set(cursor.x, cursor.y, cursor.z);
 		
+		optimizers.forEach(cro -> cro.processTile(tile, cursor, face));
+		
+		if (!tile.needsOwnRenderable()) {
+			Vectors.release(pos);
+			return;
+		}
+		
 		Vec3 offset = Vectors.grab3().set(
 				face.getVector().x, face.getVector().y, face.getVector().z
 		);

src/main/java/ru/windcorp/progressia/client/world/renders/BlockRender.java

@@ -19,7 +19,6 @@ package ru.windcorp.progressia.client.world.renders;
 
 import ru.windcorp.progressia.client.graphics.model.ShapeRenderHelper;
 import ru.windcorp.progressia.client.graphics.model.WorldRenderable;
-import ru.windcorp.progressia.client.world.renders.cro.ChunkRenderOptimizer;
 import ru.windcorp.progressia.common.util.Namespaced;
 
 public abstract class BlockRender extends Namespaced {
@@ -38,10 +37,6 @@ public abstract class BlockRender extends Namespaced {
 		return null;
 	}
 	
-	public boolean canBeOptimized(ChunkRenderOptimizer optimizer) {
-		return true;
-	}
-	
 	public boolean needsOwnRenderable() {
 		return true;
 	}

src/main/java/ru/windcorp/progressia/client/world/renders/BlockRenders.java

@@ -34,9 +34,7 @@ public class BlockRenders {
 	private static final AtlasGroup BLOCKS_ATLAS_GROUP =
 			new AtlasGroup("Blocks", 1 << 12);
 	
-	private static Texture grassTop = getTexture("grass_top");
-	private static Texture grassSide = getTexture("grass_side");
-	private static Texture dirt = getTexture("grass_bottom");
+	private static Texture dirt = getTexture("dirt");
 	private static Texture stone = getTexture("stone");
 	private static Texture glass = getTexture("glass_clear");
 	private static Texture compass = getTexture("compass");
@@ -44,7 +42,6 @@ public class BlockRenders {
 	private BlockRenders() {}
 	
 	public static void registerTest() {
-		register(new BlockRenderOpaqueCube("Test", "Grass", grassTop, dirt, grassSide, grassSide, grassSide, grassSide));
 		register(new BlockRenderOpaqueCube("Test", "Dirt", dirt, dirt, dirt, dirt, dirt, dirt));
 		register(new BlockRenderOpaqueCube("Test", "Stone", stone, stone, stone, stone, stone, stone));
 

src/main/java/ru/windcorp/progressia/client/world/renders/TileRenderGrass.java

@@ -0,0 +1,65 @@
+package ru.windcorp.progressia.client.world.renders;
+
+import glm.vec._3.Vec3;
+import ru.windcorp.progressia.client.graphics.backend.Usage;
+import ru.windcorp.progressia.client.graphics.model.Faces;
+import ru.windcorp.progressia.client.graphics.model.Shape;
+import ru.windcorp.progressia.client.graphics.model.ShapeRenderProgram;
+import ru.windcorp.progressia.client.graphics.model.WorldRenderable;
+import ru.windcorp.progressia.client.graphics.texture.Texture;
+import ru.windcorp.progressia.client.graphics.world.WorldRenderProgram;
+import ru.windcorp.progressia.client.world.renders.cro.ChunkRenderOptimizerCube.OpaqueTile;
+import ru.windcorp.progressia.common.block.BlockFace;
+import ru.windcorp.progressia.common.util.Vectors;
+
+public class TileRenderGrass extends TileRender implements OpaqueTile {
+	
+	private final Texture topTexture;
+	private final Texture sideTexture;
+	
+	public TileRenderGrass(
+			String namespace, String name,
+			Texture top, Texture side
+	) {
+		super(namespace, name);
+		this.topTexture = top;
+		this.sideTexture = side;
+	}
+
+	@Override
+	public Texture getTexture(BlockFace face) {
+		return (face == BlockFace.TOP) ? topTexture : sideTexture;
+	}
+	
+	@Override
+	public boolean isOpaque(BlockFace face) {
+		return face == BlockFace.TOP;
+	}
+	
+	@Override
+	public WorldRenderable createRenderable(BlockFace face) {
+		ShapeRenderProgram program = WorldRenderProgram.getDefault();
+		
+		Vec3 color = Vectors.grab3().set(1, 1, 1);
+		Vec3 center = Vectors.grab3().set(0, 0, 0);
+		
+		try {
+			return new Shape(
+					Usage.STATIC, WorldRenderProgram.getDefault(),
+					Faces.createBlockFace(
+							program, getTexture(face), color,
+							center, face, false
+					)
+			);
+		} finally {
+			Vectors.release(color);
+			Vectors.release(center);
+		}
+	}
+	
+	@Override
+	public boolean needsOwnRenderable() {
+		return false;
+	}
+
+}

src/main/java/ru/windcorp/progressia/client/world/renders/TileRenderSimple.java

@@ -8,10 +8,11 @@ import ru.windcorp.progressia.client.graphics.model.ShapeRenderProgram;
 import ru.windcorp.progressia.client.graphics.model.WorldRenderable;
 import ru.windcorp.progressia.client.graphics.texture.Texture;
 import ru.windcorp.progressia.client.graphics.world.WorldRenderProgram;
+import ru.windcorp.progressia.client.world.renders.cro.ChunkRenderOptimizerCube.OpaqueTile;
 import ru.windcorp.progressia.common.block.BlockFace;
 import ru.windcorp.progressia.common.util.Vectors;
 
-public class TileRenderSimple extends TileRender {
+public class TileRenderSimple extends TileRender implements OpaqueTile {
 	
 	private final Texture texture;
 	
@@ -20,10 +21,16 @@ public class TileRenderSimple extends TileRender {
 		this.texture = texture;
 	}
 
-	public Texture getTexture() {
+	@Override
+	public Texture getTexture(BlockFace face) {
 		return texture;
 	}
 	
+	@Override
+	public boolean isOpaque(BlockFace face) {
+		return false;
+	}
+	
 	@Override
 	public WorldRenderable createRenderable(BlockFace face) {
 		ShapeRenderProgram program = WorldRenderProgram.getDefault();
@@ -35,7 +42,8 @@ public class TileRenderSimple extends TileRender {
 			return new Shape(
 					Usage.STATIC, WorldRenderProgram.getDefault(),
 					Faces.createBlockFace(
-							program, texture, color, center, face, false
+							program, getTexture(face), color,
+							center, face, false
 					)
 			);
 		} finally {
@@ -44,4 +52,9 @@ public class TileRenderSimple extends TileRender {
 		}
 	}
 	
+	@Override
+	public boolean needsOwnRenderable() {
+		return false;
+	}
+
 }

src/main/java/ru/windcorp/progressia/client/world/renders/TileRenders.java

@@ -37,7 +37,11 @@ public class TileRenders {
 	private TileRenders() {}
 	
 	public static void registerTest() {
+		register(new TileRenderGrass("Test", "Grass", getTexture("grass_top"), getTexture("grass_side")));
+		
 		register(new TileRenderSimple("Test", "Stones", getTexture("stones")));
+		register(new TileRenderSimple("Test", "YellowFlowers", getTexture("yellow_flowers")));
+		register(new TileRenderSimple("Test", "Sand", getTexture("sand")));
 	}
 	
 	public static TileRender get(String name) {

src/main/java/ru/windcorp/progressia/client/world/renders/cro/ChunkRenderOptimizer.java

@@ -17,15 +17,26 @@
  *******************************************************************************/
 package ru.windcorp.progressia.client.world.renders.cro;
 
+import glm.vec._3.i.Vec3i;
 import ru.windcorp.progressia.client.graphics.model.Shape;
 import ru.windcorp.progressia.client.world.ChunkRender;
 import ru.windcorp.progressia.client.world.renders.BlockRender;
+import ru.windcorp.progressia.client.world.renders.TileRender;
+import ru.windcorp.progressia.common.block.BlockFace;
 
 public abstract class ChunkRenderOptimizer {
 	
 	public abstract void startRender(ChunkRender chunk);
 	
-	public abstract void processBlock(BlockRender block, int x, int y, int z);
+	public abstract void processBlock(
+			BlockRender block,
+			Vec3i posInChunk
+	);
+	
+	public abstract void processTile(
+			TileRender tile,
+			Vec3i posInChunk, BlockFace face
+	);
 	
 	public abstract Shape endRender();
 

src/main/java/ru/windcorp/progressia/client/world/renders/cro/ChunkRenderOptimizerCube.java

@@ -17,7 +17,9 @@
  *******************************************************************************/
 package ru.windcorp.progressia.client.world.renders.cro;
 
+import static ru.windcorp.progressia.common.block.BlockFace.BLOCK_FACE_COUNT;
 import static ru.windcorp.progressia.common.world.ChunkData.BLOCKS_PER_CHUNK;
+import static ru.windcorp.progressia.common.world.ChunkData.TILES_PER_FACE;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -33,7 +35,9 @@ import ru.windcorp.progressia.client.graphics.texture.Texture;
 import ru.windcorp.progressia.client.graphics.world.WorldRenderProgram;
 import ru.windcorp.progressia.client.world.ChunkRender;
 import ru.windcorp.progressia.client.world.renders.BlockRender;
+import ru.windcorp.progressia.client.world.renders.TileRender;
 import ru.windcorp.progressia.common.block.BlockFace;
+import ru.windcorp.progressia.common.util.Vectors;
 
 public class ChunkRenderOptimizerCube extends ChunkRenderOptimizer {
 	
@@ -43,33 +47,103 @@ public class ChunkRenderOptimizerCube extends ChunkRenderOptimizer {
 		public boolean isBlockOpaque();
 	}
 	
+	public static interface OpaqueTile {
+		public Texture getTexture(BlockFace face);
+		public boolean isOpaque(BlockFace face);
+	}
+	
+	private static class BlockInfo {
+		OpaqueCube block;
+		final FaceInfo[] faces = new FaceInfo[BLOCK_FACE_COUNT];
+		
+		{
+			for (int i = 0; i < faces.length; ++i) {
+				faces[i] = new FaceInfo();
+			}
+		}
+	}
+	
+	private static class FaceInfo {
+		static final int NO_OPAQUE_TILES = -1;
+		
+		int topOpaqueTile = NO_OPAQUE_TILES;
+		final OpaqueTile[] tiles = new OpaqueTile[TILES_PER_FACE];
+		int tileCount = 0;
+	}
+	
 	private static final Vec3 COLOR_MULTIPLIER = new Vec3(1, 1, 1);
 	
-	private final OpaqueCube[][][] data =
-			new OpaqueCube[BLOCKS_PER_CHUNK]
+//	private final OpaqueCube[][][] blocks =
+//			new OpaqueCube[BLOCKS_PER_CHUNK]
+//			              [BLOCKS_PER_CHUNK]
+//			              [BLOCKS_PER_CHUNK];
+//	
+//	private final OpaqueTile[][][][][] tiles =
+//			new OpaqueTile[BLOCKS_PER_CHUNK]
+//			              [BLOCKS_PER_CHUNK]
+//			              [BLOCKS_PER_CHUNK]
+//			              [BLOCK_FACE_COUNT]
+//			              [TILES_PER_FACE];
+	
+	private final BlockInfo[][][] data = 
+			new BlockInfo[BLOCKS_PER_CHUNK]
 			             [BLOCKS_PER_CHUNK]
 			             [BLOCKS_PER_CHUNK];
 	
+	{
+		for (int x = 0; x < BLOCKS_PER_CHUNK; ++x) {
+			for (int y = 0; y < BLOCKS_PER_CHUNK; ++y) {
+				for (int z = 0; z < BLOCKS_PER_CHUNK; ++z) {
+					data[x][y][z] = new BlockInfo();
+				}
+			}
+		}
+	}
+
 	@Override
 	public void startRender(ChunkRender chunk) {
 		// Do nothing
 	}
 
 	@Override
-	public void processBlock(BlockRender block, int x, int y, int z) {
+	public void processBlock(BlockRender block, Vec3i pos) {
 		if (!(block instanceof OpaqueCube)) return;
 		OpaqueCube opaqueCube = (OpaqueCube) block;
-		addBlock(x, y, z, opaqueCube);
+		addBlock(pos, opaqueCube);
 	}
 	
-	protected void addBlock(int x, int y, int z, OpaqueCube cube) {
-		data[x][y][z] = cube;
+	@Override
+	public void processTile(TileRender tile, Vec3i pos, BlockFace face) {
+		if (!(tile instanceof OpaqueTile)) return;
+		OpaqueTile opaqueTile = (OpaqueTile) tile;
+		addTile(pos, face, opaqueTile);
 	}
 
-	protected OpaqueCube getBlock(Vec3i cursor) {
+	protected void addBlock(Vec3i pos, OpaqueCube cube) {
+		getBlock(pos).block = cube;
+	}
+	
+	private void addTile(Vec3i pos, BlockFace face, OpaqueTile opaqueTile) {
+		FaceInfo faceInfo = getFace(pos, face);
+		
+		int index = faceInfo.tileCount;
+		faceInfo.tileCount++;
+		
+		faceInfo.tiles[index] = opaqueTile;
+		
+		if (opaqueTile.isOpaque(face)) {
+			faceInfo.topOpaqueTile = index;
+		}
+	}
+	
+	protected BlockInfo getBlock(Vec3i cursor) {
 		return data[cursor.x][cursor.y][cursor.z];
 	}
 	
+	protected FaceInfo getFace(Vec3i cursor, BlockFace face) {
+		return getBlock(cursor).faces[face.getId()];
+	}
+
 	@Override
 	public Shape endRender() {
 		
@@ -82,12 +156,8 @@ public class ChunkRenderOptimizerCube extends ChunkRenderOptimizer {
 		for (cursor.x = 0; cursor.x < BLOCKS_PER_CHUNK; ++cursor.x) {
 			for (cursor.y = 0; cursor.y < BLOCKS_PER_CHUNK; ++cursor.y) {
 				for (cursor.z = 0; cursor.z < BLOCKS_PER_CHUNK; ++cursor.z) {
-					OpaqueCube block = getBlock(cursor);
-					
-					if (block == null) continue;
-					
-					processInnerFaces(block, cursor, shapeFaces::add);
-					processOuterFaces(block, cursor, shapeFaces::add);
+					processInnerFaces(cursor, shapeFaces::add);
+					processOuterFaces(cursor, shapeFaces::add);
 				}
 			}
 		}
@@ -99,62 +169,82 @@ public class ChunkRenderOptimizerCube extends ChunkRenderOptimizer {
 		);
 	}
 	
-	private void processInnerFaces(
-			OpaqueCube block,
-			Vec3i cursor,
-			Consumer<Face> output
-	) {
-		if (block.isBlockOpaque()) return;
-		
-		for (BlockFace face : BlockFace.getFaces()) {
-			
-			Texture texture = block.getTexture(face);
-			if (texture == null) continue;
-			
-			output.accept(Faces.createBlockFace(
-					WorldRenderProgram.getDefault(),
-					texture,
-					COLOR_MULTIPLIER,
-					new Vec3(cursor.x, cursor.y, cursor.z),
-					face,
-					true
-			));
-			
-		}
-	}
-	
 	private void processOuterFaces(
-			OpaqueCube block,
 			Vec3i cursor,
 			Consumer<Face> output
 	) {
+		Vec3 faceOrigin = Vectors.grab3();
+		Vec3 offset = Vectors.grab3();
+		
 		for (BlockFace face : BlockFace.getFaces()) {
+			if (!shouldRenderOuterFace(cursor, face)) continue;
 			
-			Texture texture = block.getTexture(face);
-			if (texture == null) continue;
+			faceOrigin.set(cursor.x, cursor.y, cursor.z);
+			offset
+				.set(face.getVector().x, face.getVector().y, face.getVector().z)
+				.mul(1f / 128);
 			
-			if (!shouldRenderFace(cursor, face)) continue;
+			FaceInfo info = getFace(cursor, face);
+			
+			if (info.topOpaqueTile == FaceInfo.NO_OPAQUE_TILES) {
+				OpaqueCube block = getBlock(cursor).block;
+				
+				if (block != null) {
+					addFace(
+							faceOrigin, face,
+							getBlock(cursor).block.getTexture(face), 
+							output
+					);
+					
+					faceOrigin.add(offset);
+				}
+			}
+			
+			int startLayer = info.topOpaqueTile;
+			if (startLayer == FaceInfo.NO_OPAQUE_TILES) {
+				startLayer = 0;
+			}
+			
+			for (int layer = startLayer; layer < info.tileCount; ++layer) {
+				addFace(
+						faceOrigin, face,
+						info.tiles[layer].getTexture(face),
+						output
+				);
+				
+				faceOrigin.add(offset);
+			}
+		}
+
+		Vectors.release(offset);
+		Vectors.release(faceOrigin);
+	}
+	
+	private void addFace(
+			Vec3 cursor, BlockFace face,
+			Texture texture,
+			Consumer<Face> output
+	) {
+		if (texture == null) return;
 		
 		output.accept(Faces.createBlockFace(
 				WorldRenderProgram.getDefault(),
 				texture,
 				COLOR_MULTIPLIER,
-					new Vec3(cursor.x, cursor.y, cursor.z),
+				new Vec3(cursor),
 				face,
 				false
 		));
-			
-		}
 	}
 
-	private boolean shouldRenderFace(Vec3i cursor, BlockFace face) {
+	private boolean shouldRenderOuterFace(Vec3i cursor, BlockFace face) {
 		cursor.add(face.getVector());
 		try {
 			
 			// TODO handle neighboring chunks properly
 			if (!isInBounds(cursor)) return true;
 			
-			OpaqueCube adjacent = getBlock(cursor);
+			OpaqueCube adjacent = getBlock(cursor).block;
 			
 			if (adjacent == null) return true;
 			if (adjacent.isOpaque(face)) return false;
@@ -166,6 +256,29 @@ public class ChunkRenderOptimizerCube extends ChunkRenderOptimizer {
 		}
 	}
 
+	private void processInnerFaces(
+			Vec3i cursor,
+			Consumer<Face> output
+	) {
+//		if (block.isBlockOpaque()) return;
+//		
+//		for (BlockFace face : BlockFace.getFaces()) {
+//			
+//			Texture texture = block.getTexture(face);
+//			if (texture == null) continue;
+//			
+//			output.accept(Faces.createBlockFace(
+//					WorldRenderProgram.getDefault(),
+//					texture,
+//					COLOR_MULTIPLIER,
+//					new Vec3(cursor.x, cursor.y, cursor.z),
+//					face,
+//					true
+//			));
+//			
+//		}
+	}
+
 	private boolean isInBounds(Vec3i cursor) {
 		return
 				isInBounds(cursor.x) &&

src/main/java/ru/windcorp/progressia/common/block/BlockDataRegistry.java

@@ -25,7 +25,6 @@ public class BlockDataRegistry {
 	private static final Map<String, BlockData> REGISTRY = new HashMap<>();
 	
 	static {
-		register(new BlockData("Test", "Grass"));
 		register(new BlockData("Test", "Dirt"));
 		register(new BlockData("Test", "Stone"));
 		register(new BlockData("Test", "Air"));

src/main/java/ru/windcorp/progressia/common/block/TileDataRegistry.java

@@ -25,7 +25,10 @@ public class TileDataRegistry {
 	private static final Map<String, TileData> REGISTRY = new HashMap<>();
 	
 	static {
+		register(new TileData("Test", "Grass"));
 		register(new TileData("Test", "Stones"));
+		register(new TileData("Test", "YellowFlowers"));
+		register(new TileData("Test", "Sand"));
 	}
 	
 	public static TileData get(String name) {

src/main/java/ru/windcorp/progressia/common/world/ChunkData.java

@@ -59,12 +59,14 @@ public class ChunkData {
 	}
 	
 	private void tmp_generate() {
-		BlockData grass = BlockDataRegistry.get("Test:Grass");
 		BlockData dirt = BlockDataRegistry.get("Test:Dirt");
 		BlockData stone = BlockDataRegistry.get("Test:Stone");
 		BlockData air = BlockDataRegistry.get("Test:Air");
 
+		TileData grass = TileDataRegistry.get("Test:Grass");
 		TileData stones = TileDataRegistry.get("Test:Stones");
+		TileData flowers = TileDataRegistry.get("Test:YellowFlowers");
+		TileData sand = TileDataRegistry.get("Test:Sand");
 	
 		Vec3i aPoint = new Vec3i(5, 0, BLOCKS_PER_CHUNK + BLOCKS_PER_CHUNK/2);
 		Vec3i pos = new Vec3i();
@@ -95,12 +97,26 @@ public class ChunkData {
 				
 				for (pos.z = BLOCKS_PER_CHUNK - 1; pos.z >= 0 && getBlock(pos) == air; --pos.z);
 				
-				setBlock(pos, grass);
+				getTiles(pos, BlockFace.TOP).add(grass);
+				for (BlockFace face : BlockFace.getFaces()) {
+					if (face.getVector().z != 0) continue;
+					getTiles(pos, face).add(grass);
+				}
 				
-				int hash = x*x * 13 ^ y*y * 37 ^ pos.z*pos.z * 129;
+				int hash = x*x * 19 ^ y*y * 41 ^ pos.z*pos.z * 147;
+				if (hash % 5 == 0) {
+					getTiles(pos, BlockFace.TOP).add(sand);
+				}
+				
+				hash = x*x * 13 ^ y*y * 37 ^ pos.z*pos.z * 129;
 				if (hash % 5 == 0) {
 					getTiles(pos, BlockFace.TOP).add(stones);
 				}
+				
+				hash = x*x * 17 ^ y*y * 39 ^ pos.z*pos.z * 131;
+				if (hash % 9 == 0) {
+					getTiles(pos, BlockFace.TOP).add(flowers);
+				}
 			}
 		}
 	}
@@ -218,8 +234,8 @@ public class ChunkData {
 		return
 				(blockInChunk.x == min && face == SOUTH ) ||
 				(blockInChunk.x == max && face == NORTH ) ||
-				(blockInChunk.y == min && face == WEST  ) ||
-				(blockInChunk.y == max && face == EAST  ) ||
+				(blockInChunk.y == min && face == EAST  ) ||
+				(blockInChunk.y == max && face == WEST  ) ||
 				(blockInChunk.z == min && face == BOTTOM) ||
 				(blockInChunk.z == max && face == TOP   );
 	}