src/com/plusminus/craft/Chunk.java - minecraft/minecraftxray - Rivoreo Source Code Repositories

 package com.plusminus.craft;

 import org.lwjgl.opengl.GL11;

 import com.plusminus.craft.dtf.ByteArrayTag;
 import com.plusminus.craft.dtf.CompoundTag;
 import com.plusminus.craft.dtf.IntTag;
 import com.plusminus.craft.dtf.Tag;

 import static com.plusminus.craft.MineCraftConstants.*;

 public class Chunk {
 	private int displayListNum;
 	private int transparentListNum;
 	private int selectedDisplayListNum;
 	public int x;
 	public int z;
 	public boolean isDirty;
 	public boolean isSelectedDirty;
 	private CompoundTag chunkData;
 	private ByteArrayTag blockData;
 	private ByteArrayTag mapData;

 	private MinecraftLevel level;

 	public Chunk(Tag data, MinecraftLevel level) {
 		this.chunkData = (CompoundTag) data;
 		//System.out.println(this.chunkData);
 		//System.exit(0);
 		displayListNum = GL11.glGenLists(1);
 		selectedDisplayListNum = GL11.glGenLists(1);
 		transparentListNum = GL11.glGenLists(1);
 		CompoundTag levelTag = (CompoundTag) chunkData.value.get(0); // first tag
 		IntTag xPosTag = (IntTag) levelTag.getTagWithName("xPos");
 		IntTag zPosTag = (IntTag) levelTag.getTagWithName("zPos");

 		this.x = xPosTag.value;
 		this.z = zPosTag.value;

 		blockData = (ByteArrayTag) levelTag.getTagWithName("Blocks");
 		mapData = (ByteArrayTag) levelTag.getTagWithName("Data");

 		this.isDirty = true;
 		this.isSelectedDirty = true;
 		this.level = level;

 		//System.out.println(data);
 		//System.exit(0);
 	}

 	public CompoundTag getChunkData() {
 		return this.chunkData;
 	}

 	public ByteArrayTag getMapData() {
 		return this.blockData;
 	}

 	public void renderLeftRight(int t, float x, float y, float z) {
 		GL11.glBegin(GL11.GL_TRIANGLE_STRIP);
 			GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t], precalcSpriteSheetToTextureY[t]);
 			GL11.glVertex3f(x-0.5f, y+0.5f, z+0.5f);

 			GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t]+TEX16, precalcSpriteSheetToTextureY[t]);
 			GL11.glVertex3f(x-0.5f, y+0.5f, z-0.5f);

 			GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t],precalcSpriteSheetToTextureY[t]+TEX16);
 			GL11.glVertex3f(x-0.5f, y-0.5f, z+0.5f);

 			GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t]+TEX16, precalcSpriteSheetToTextureY[t]+TEX16);
 			GL11.glVertex3f(x-0.5f, y-0.5f, z-0.5f);
 		GL11.glEnd();
 	}

 	public void renderTopDown(int t, float x, float y, float z) {
 		GL11.glBegin(GL11.GL_TRIANGLE_STRIP);
 			GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t], precalcSpriteSheetToTextureY[t]);
 			GL11.glVertex3f(x-0.5f, y-0.5f, z+0.5f);

 			GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t]+TEX16, precalcSpriteSheetToTextureY[t]);
 			GL11.glVertex3f(x-0.5f, y-0.5f, z-0.5f);

 			GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t], precalcSpriteSheetToTextureY[t]+TEX16);
 			GL11.glVertex3f(x+0.5f, y-0.5f, z+0.5f);

 			GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t]+TEX16, precalcSpriteSheetToTextureY[t]+TEX16);
 			GL11.glVertex3f(x+0.5f, y-0.5f, z-0.5f);
 		GL11.glEnd();
 	}

 	public void renderFarNear(int t, float x, float y, float z) {
 		GL11.glBegin(GL11.GL_TRIANGLE_STRIP);
 			GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t], precalcSpriteSheetToTextureY[t]);
 			GL11.glVertex3f(x-0.5f, y+0.5f, z-0.5f);

 			GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t]+TEX16, precalcSpriteSheetToTextureY[t]);
 			GL11.glVertex3f(x+0.5f, y+0.5f, z-0.5f);

 			GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t], precalcSpriteSheetToTextureY[t]+TEX16);
 			GL11.glVertex3f(x-0.5f, y-0.5f, z-0.5f);

 			GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t]+TEX16, precalcSpriteSheetToTextureY[t]+TEX16);
 			GL11.glVertex3f(x+0.5f, y-0.5f, z-0.5f);
 		GL11.glEnd();
 	}

 	public boolean isInRange(float x, float y, float maxDistance) {
 		float realX = this.x*16;
 		float realY = this.z*16;
 		double distance = Math.sqrt(((x-realX) * (x-realX)) + ((y-realY) * (y-realY)));
 		return distance < maxDistance;
 	}

 	public byte getBlock(int x, int y, int z) {
 		return blockData.value[y + (z * 128) + (x * 128 * 16)];
 	}

 	public byte getData(int x, int y, int z) {
 		int offset = y + (z * 128) + (x * 128 * 16);
 		int halfOffset = offset / 2;
 		if(offset % 2 == 0) {
 			return (byte) (mapData.value[halfOffset] & 0xF);
 		} else {
 			return (byte) (mapData.value[halfOffset] >> 4);
 		}
 	}

 	public boolean isSolid(byte i) {
 		BLOCK_TYPE block_type = BLOCK_TYPE_MAP.get(i);
 		if((i == 0) || (i == TYPE_WATER) || (i == TYPE_WATER_STATIONARY) ||
 				(i==TYPE_LAVA) || (i==TYPE_LAVA_STATIONARY) ||
 				(block_type == BLOCK_TYPE.TORCH) || (block_type == BLOCK_TYPE.UPRIGHT) ||
 				(block_type == BLOCK_TYPE.CROPS)) {
 			return false;
 		}

 		return true;
 	}

 	public void renderSpecial(float bx, float by, float ex, float ey, float x, float y, float z, float yy, float x1, float x2, float z1, float z2) {

 		// GL11.glDisable(GL11.GL_CULL_FACE);
 		 //GL11.glDisable(GL11.GL_DEPTH_TEST);
 		 GL11.glBegin(GL11.GL_QUADS);
 		 GL11.glNormal3f(1.0f, 0.0f, 0.0f);
 		 GL11.glTexCoord2f(bx, by); 	GL11.glVertex3f(x+x1+9/16.0f+TEX64, y+yy+1.0f, 	z+z1);
 		 GL11.glTexCoord2f(ex, by); 	GL11.glVertex3f(x+x1+9/16.0f+TEX64, y+yy+1.0f, 	z+z1+1.0f);
 		 GL11.glTexCoord2f(ex, ey); 	GL11.glVertex3f(x+x2+9/16.0f-TEX64, y+yy, 		z+z2+1.0f);
 		 GL11.glTexCoord2f(bx, ey); 	GL11.glVertex3f(x+x2+9/16.0f-TEX64, y+yy,	 	z+z2);

 		 GL11.glNormal3f(-1.0f, 0.0f, 0.0f);
 		 GL11.glTexCoord2f(bx, by); 	GL11.glVertex3f(x+x1+7/16.0f+TEX64, y+yy+1.0f, 	z+z1+1.0f);
 		 GL11.glTexCoord2f(ex, by); 	GL11.glVertex3f(x+x1+7/16.0f+TEX64, y+yy+1.0f, 	z+z1);
 		 GL11.glTexCoord2f(ex, ey); 	GL11.glVertex3f(x+x2+7/16.0f-TEX64, y+yy, 		z+z2);
 		 GL11.glTexCoord2f(bx, ey); 	GL11.glVertex3f(x+x2+7/16.0f-TEX64, y+yy, 		z+z2+1.0f);

 		 GL11.glNormal3f(0.0f, 0.0f, 1.0f);
 		 GL11.glTexCoord2f(bx, by); 	GL11.glVertex3f(x+x1+1.0f, 	y+yy+1.0f, 	z+z1+9/16.0f+TEX64);
 		 GL11.glTexCoord2f(ex, by); 	GL11.glVertex3f(x+x1, 		y+yy+1.0f, 	z+z1+9/16.0f+TEX64);
 		 GL11.glTexCoord2f(ex, ey); 	GL11.glVertex3f(x+x2, 		y+yy, 		z+z2+9/16.0f-TEX64);
 		 GL11.glTexCoord2f(bx, ey);	 	GL11.glVertex3f(x+x2+1.0f, 	y+yy, 		z+z2+9/16.0f-TEX64);

 		 GL11.glNormal3f(0.0f, 0.0f, -1.0f);
 		 GL11.glTexCoord2f(bx, by); 	GL11.glVertex3f(x+x1, 		y+yy+1.0f, 	z+z1+7/16.0f+TEX64);
 		 GL11.glTexCoord2f(ex, by); 	GL11.glVertex3f(x+x1+1.0f, 	y+yy+1.0f, 	z+z1+7/16.0f+TEX64);
 		 GL11.glTexCoord2f(ex, ey); 	GL11.glVertex3f(x+x2+1.0f, 	y+yy, 		z+z2+7/16.0f-TEX64);
 		 GL11.glTexCoord2f(bx, ey); 	GL11.glVertex3f(x+x2, 		y+yy, 		z+z2+7/16.0f-TEX64);
 		 x1 *= 2.125f; z1 *= 2.125f;

 		 GL11.glNormal3f(0.0f, 1.0f, 0.0f);
 		 GL11.glTexCoord2f(bx+TEX128, by+TEX128); 	GL11.glVertex3f(x+x1+9/16.0f, y+yy+10/16.0f, z+z1+7/16.0f);
 		 GL11.glTexCoord2f(ex-TEX128, by+TEX128); 	GL11.glVertex3f(x+x1+7/16.0f, y+yy+10/16.0f, z+z1+7/16.0f);
 		 GL11.glTexCoord2f(ex-TEX128, ey-TEX32); 	GL11.glVertex3f(x+x1+7/16.0f, y+yy+10/16.0f, z+z1+9/16.0f);
 		 GL11.glTexCoord2f(bx+TEX128, ey-TEX32); 	GL11.glVertex3f(x+x1+9/16.0f, y+yy+10/16.0f, z+z1+9/16.0f);

 		 GL11.glEnd();
 		 //GL11.glEnable(GL11.GL_DEPTH_TEST);
 		 //GL11.glEnable(GL11.GL_CULL_FACE);
 	}

 	public void renderTorch(int xxx, int yyy, int zzz, int block_type) {
 		 float x1 = 0, x2 = 0, z1 = 0, z2 = 0, yy = 0;
 		 byte data = getData(xxx, yyy, zzz);
 		 switch (data) {
 		 case 1:
 			 x1 -= 0.125; x2 -= 0.5;
 			 yy = 3/16.0f; break;
 		 case 2:
 			 x1 += 0.125; x2 += 0.5;
 			 yy = 3/16.0f; break;
 		 case 3:
 			 z1 -= 0.125; z2 -= 0.5;
 			 yy = 3/16.0f; break;
 		 case 4:
 			 z1 += 0.125; z2 += 0.5;
 			 yy = 3/16.0f; break;
 		 }
 		 //Light(chunk, x, y, z);
 		 float x = xxx + this.x*16 -0.5f;
 		 float z = zzz + this.z*16 -0.5f;
 		 float y = yyy - 0.5f;
 		 /*
 		  *
 		  *  RectangleF rect = new RectangleF(x / 16.0f + 0.00004f, y / 16.0f + 0.00004f,
 1 / 16.0f - 0.00008f, 1 / 16.0f - 0.00008f);
 		  */

 		 float bx,by;
 		 float ex,ey;

 		 switch(block_type)
 		 {
 		 	case MineCraftConstants.BLOCK_REDSTONE_TORCH_ON:
 				bx = (TEX16*3) + TEX64;
 				by = TEX16 + (5.0f / 16.0f);
 		 		break;
 		 	case MineCraftConstants.BLOCK_REDSTONE_TORCH_OFF:
 				bx = (TEX16*3) + TEX64;
 				by = (TEX16*2) + (5.0f / 16.0f);
 		 		break;
 		 	default:
 		 		bx = 0.0f+TEX64;
 		 		by = 5.0f / 16.0f;
 		 }
 		 ex = bx + TEX16-TEX32;
 		 ey = by + TEX16;

 		 renderSpecial(bx, by, ex, ey, x, y, z, yy, x1, x2, z1, z2);
 	}

 	/***
 	 * Yanked wholesale from renderTorch
 	 * @param xxx
 	 * @param yyy
 	 * @param zzz
 	 * @param block_type
 	 */
 	public void renderUpright(int xxx, int yyy, int zzz, int block_type) {
 		 float x1 = 0, x2 = 0, z1 = 0, z2 = 0, yy = 0;
 		 //Light(chunk, x, y, z);
 		 float x = xxx + this.x*16 -0.5f;
 		 float z = zzz + this.z*16 -0.5f;
 		 float y = yyy - 0.5f;

 		 float bx,by;
 		 float ex,ey;

 		 switch(block_type)
 		 {
 		 	case MineCraftConstants.BLOCK_SAPLING:
 				bx = .9375f + TEX64; // 12/16
 				by = 0;
 		 		break;
 		 	case MineCraftConstants.BLOCK_RED_ROSE:
 				bx = .75f + TEX64; // 12/16
 				by = 0;
 		 		break;
 		 	case MineCraftConstants.BLOCK_YELLOW_FLOWER:
 				bx = .8125f + TEX64; // 13/16
 				by = 0;
 		 		break;
 		 	case MineCraftConstants.BLOCK_RED_MUSHROOM:
 				bx = .75f + TEX64; // 12/16
 				by = .0625f; // 1/16
 		 		break;
 		 	case MineCraftConstants.BLOCK_BROWN_MUSHROOM:
 		 	default:
 		 		bx = .8125f + TEX64; // 13/16
 		 		by = .0625f; // 1/16
 		 }
  		 ex = bx + TEX16-TEX32;
  		 ey = by + TEX16;

  		 renderSpecial(bx, by, ex, ey, x, y, z, yy, x1, x2, z1, z2);
 	}

 	public void renderCrops(int xxx, int yyy, int zzz) {
 		 float x1 = 0, x2 = 0, z1 = 0, z2 = 0, yy = 0;
 		 float x = xxx + this.x*16 -0.5f;
 		 float z = zzz + this.z*16 -0.5f;
 		 float y = yyy - 0.5f;

 		 float bx,by;
 		 float ex,ey;

 		 byte data = getData(xxx, yyy, zzz);
 		 switch(data)
 		 {
 		 	case 7:
 		 		bx = .9375f; // 15/16
 		 		break;
 		 	case 6:
 		 		bx = .875f; // 14/16
 		 		break;
 		 	case 5:
 		 		bx = .8125f; // 13/16
 		 		break;
 		 	case 4:
 		 		bx = .75f; // 12/16
 		 		break;
 		 	case 3:
 		 		bx = .6875f; // 11/16
 		 		break;
 		 	case 2:
 		 		bx = .625f; // 10/16
 		 		break;
 		 	case 1:
 		 		bx = .5625f; // 9/16
 		 		break;
 		 	case 0:
 		 	default:
 		 		bx = 0.5f; // 8/16
 		 }
 		 by = .3125f; // 5/16
 		 ex = bx + TEX16;
 		 ey = by + TEX16;

 		 renderSpecial(bx, by, ex, ey, x, y, z, yy, x1, x2, z1, z2);
 	}

 	public boolean checkSolid(byte block, boolean transpararency) {
 		if(block == 0) {
 			return true;
 		}
 		return isSolid(block) == transpararency;
 	}

 	public void renderWorld(boolean transparency, boolean render_bedrock, boolean onlySelected, boolean[] selectedMap) {
 		float worldX = this.x*16;
 		float worldZ = this.z*16;
 		for(int x=0;x<16;x++) {
 			int xOff = (x * 128 * 16);
 			for(int z=0;z<16;z++) {
 				int zOff = (z * 128);
 				int blockOffset = zOff + xOff-1;
 				for(int y=0;y<128;y++) {
 					blockOffset++;
 					byte t = blockData.value[blockOffset];

 					if(t == 0) {
 						continue;
 					}

 					/*if(t == TYPE_TORCH) {
 						//System.out.println("Torch: " + getData(x,y,z));
 					}*/

 					int textureId = blockDataToSpriteSheet[t];

 					if(textureId == -1) {
 						//System.out.println("unknown block type: " + t);
 						continue;
 					}

 					if(transparency && isSolid(t)) {
 						continue;
 					}
 					if(!transparency && !isSolid(t)) {
 						continue;
 					}
 					//if(!transparency && !isSolid(t)) {
 					//	continue;
 					//}

 					boolean draw = false;

 					if(!onlySelected) {
 						boolean above = true;
 						boolean below = true;
 						boolean left = true;
 						boolean right = true;
 						boolean near = true;
 						boolean far = true;

 						if (render_bedrock && t == MineCraftConstants.BLOCK_BEDROCK)
 						{
 							// This block of code was more or less copied/modified directly from the "else" block
 							// below - should see if there's a way we can abstract this instead.  Also, I suspect
 							// that this is where we'd fix water rendering...

 							// check above
 							if(y<127 && blockData.value[blockOffset+1] != MineCraftConstants.BLOCK_BEDROCK) {
 								draw = true;
 								above = false;
 							}

 							// check below
 							if(y>0 && blockData.value[blockOffset-1] != MineCraftConstants.BLOCK_BEDROCK) {
 								draw = true;
 								below = false;
 							}

 							// check left;
 							if(x>0 && blockData.value[blockOffset-BLOCKSPERCOLUMN] != MineCraftConstants.BLOCK_BEDROCK) {
 								draw = true;
 								left = false;
 							} else if(x==0 && this.x > -63) {
 								Chunk leftChunk = level.getChunk(this.x-1, this.z);
 								if(leftChunk != null && leftChunk.getBlock(15, y, z) != MineCraftConstants.BLOCK_BEDROCK) {
 									draw = true;
 									left = false;
 								}
 							}

 							// check right
 							if(x<15 && blockData.value[blockOffset+BLOCKSPERCOLUMN] != MineCraftConstants.BLOCK_BEDROCK) {
 								draw = true;
 								right = false;
 							} else if(x==15 && this.x < 63) {
 								Chunk rightChunk = level.getChunk(this.x+1,this.z);
 								if(rightChunk != null && rightChunk.getBlock(0, y, z) != MineCraftConstants.BLOCK_BEDROCK) {
 									draw = true;
 									right = false;
 								}
 							}

 							// check near
 							if(z>0 && blockData.value[blockOffset-BLOCKSPERROW] != MineCraftConstants.BLOCK_BEDROCK) {
 								draw = true;
 								near = false;
 							} else if(z==0 && this.z > -63) {
 								Chunk nearChunk = level.getChunk(this.x,this.z-1);
 								if(nearChunk != null && nearChunk.getBlock(x, y, 15) != MineCraftConstants.BLOCK_BEDROCK) {
 									draw = true;
 									near = false;
 								}
 							}

 							// check far
 							if(z<15 && blockData.value[blockOffset+BLOCKSPERROW] != MineCraftConstants.BLOCK_BEDROCK) {
 								draw = true;
 								far = false;
 							} else if(z==15 && this.z < 63) {
 								Chunk farChunk = level.getChunk(this.x,this.z+1);
 								if(farChunk != null && farChunk.getBlock(x, y, 0) != MineCraftConstants.BLOCK_BEDROCK) {
 									draw = true;
 									far = false;
 								}
 							}
 						}
 						else
 						{
 							// check above
 							if(y<127 && checkSolid(blockData.value[blockOffset+1], transparency)) {
 								draw = true;
 								above = false;
 							}

 							// check below
 							if(y>0 && checkSolid(blockData.value[blockOffset-1], transparency)) {
 								draw = true;
 								below = false;
 							}

 							// check left;
 							if(x>0 && checkSolid(blockData.value[blockOffset-BLOCKSPERCOLUMN], transparency)) {
 								draw = true;
 								left = false;
 							} else if(x==0 && this.x > -63) {
 								Chunk leftChunk = level.getChunk(this.x-1, this.z);
 								if(leftChunk != null && checkSolid(leftChunk.getBlock(15, y, z), transparency)) {
 									draw = true;
 									left = false;
 								}
 							}

 							// check right
 							if(x<15 && checkSolid(blockData.value[blockOffset+BLOCKSPERCOLUMN], transparency)) {
 								draw = true;
 								right = false;
 							} else if(x==15 && this.x < 63) {
 								Chunk rightChunk = level.getChunk(this.x+1,this.z);
 								if(rightChunk != null && checkSolid(rightChunk.getBlock(0, y, z), transparency)) {
 									draw = true;
 									right = false;
 								}
 							}

 							// check near
 							if(z>0 && checkSolid(blockData.value[blockOffset-BLOCKSPERROW], transparency)) {
 								draw = true;
 								near = false;
 							} else if(z==0 && this.z > -63) {
 								Chunk nearChunk = level.getChunk(this.x,this.z-1);
 								if(nearChunk != null && checkSolid(nearChunk.getBlock(x, y, 15), transparency)) {
 									draw = true;
 									near = false;
 								}
 							}

 							// check far
 							if(z<15 && checkSolid(blockData.value[blockOffset+BLOCKSPERROW], transparency)) {
 								draw = true;
 								far = false;
 							} else if(z==15 && this.z < 63) {
 								Chunk farChunk = level.getChunk(this.x,this.z+1);
 								if(farChunk != null && checkSolid(farChunk.getBlock(x, y, 0), transparency)) {
 									draw = true;
 									far = false;
 								}
 							}
 						}

 						switch(BLOCK_TYPE_MAP.get(t))
 						{
 							case TORCH:
 								renderTorch(x,y,z,t);
 								break;
 							case UPRIGHT:
 								renderUpright(x,y,z,t);
 								break;
 							case CROPS:
 								renderCrops(x,y,z);
 								break;
 							default:
 								// if we have to draw this block
 								if(draw) {
 									if(!near) this.renderFarNear(textureId, worldX+x, y, worldZ+z);
 									if(!far) this.renderFarNear(textureId, worldX+x, y, worldZ+z+1);

 									if(!below) this.renderTopDown(textureId, worldX+x, y, worldZ+z);
 									if(!above) this.renderTopDown(textureId, worldX+x, y+1, worldZ+z);

 									if(!left) this.renderLeftRight(textureId, worldX+x, y, worldZ+z);
 									if(!right) this.renderLeftRight(textureId, worldX+x+1, y, worldZ+z);
 								}
 						}
 					} else {
 						draw = false;
 						for(int i=0;i<selectedMap.length;i++) {
 							if(selectedMap[i] && HIGHLIGHT_ORES[i] == t) {
 								draw = true;
 								break;
 							}
 						}
 						if(draw) {
 							this.renderFarNear(textureId, worldX+x, y, worldZ+z);
 							this.renderFarNear(textureId, worldX+x, y, worldZ+z+1);

 							this.renderTopDown(textureId, worldX+x, y, worldZ+z);
 							this.renderTopDown(textureId, worldX+x, y+1, worldZ+z);

 							this.renderLeftRight(textureId, worldX+x, y, worldZ+z);
 							this.renderLeftRight(textureId, worldX+x+1, y, worldZ+z);
 						}
 					}

 				}
 			}
 		}
 	}

 	public void renderSolid(boolean render_bedrock) {
 		if(isDirty) {
 				GL11.glNewList(this.displayListNum, GL11.GL_COMPILE);
 				renderWorld(false, render_bedrock, false, null);
 				GL11.glEndList();
 				GL11.glNewList(this.transparentListNum, GL11.GL_COMPILE);
 				renderWorld(true, false, false, null);
 				GL11.glEndList();
 				this.isDirty = false;
 		}
 		GL11.glCallList(this.displayListNum);
 	}

 	public void renderTransparency() {
 		GL11.glCallList(this.transparentListNum);
 	}

 	public void renderSelected(boolean[] selectedMap) {
 		if(isSelectedDirty) {
 			GL11.glNewList(this.selectedDisplayListNum, GL11.GL_COMPILE);
 			renderWorld(false, false, true, selectedMap);
 			GL11.glEndList();
 			this.isSelectedDirty = false;
 		}
 		GL11.glCallList(this.selectedDisplayListNum);
 	}
 }
	package com.plusminus.craft;

	import org.lwjgl.opengl.GL11;

	import com.plusminus.craft.dtf.ByteArrayTag;
	import com.plusminus.craft.dtf.CompoundTag;
	import com.plusminus.craft.dtf.IntTag;
	import com.plusminus.craft.dtf.Tag;

	import static com.plusminus.craft.MineCraftConstants.*;

	public class Chunk {
	private int displayListNum;
	private int transparentListNum;
	private int selectedDisplayListNum;
	public int x;
	public int z;
	public boolean isDirty;
	public boolean isSelectedDirty;
	private CompoundTag chunkData;
	private ByteArrayTag blockData;
	private ByteArrayTag mapData;

	private MinecraftLevel level;

	public Chunk(Tag data, MinecraftLevel level) {
	this.chunkData = (CompoundTag) data;
	//System.out.println(this.chunkData);
	//System.exit(0);
	displayListNum = GL11.glGenLists(1);
	selectedDisplayListNum = GL11.glGenLists(1);
	transparentListNum = GL11.glGenLists(1);
	CompoundTag levelTag = (CompoundTag) chunkData.value.get(0); // first tag
	IntTag xPosTag = (IntTag) levelTag.getTagWithName("xPos");
	IntTag zPosTag = (IntTag) levelTag.getTagWithName("zPos");

	this.x = xPosTag.value;
	this.z = zPosTag.value;

	blockData = (ByteArrayTag) levelTag.getTagWithName("Blocks");
	mapData = (ByteArrayTag) levelTag.getTagWithName("Data");

	this.isDirty = true;
	this.isSelectedDirty = true;
	this.level = level;

	//System.out.println(data);
	//System.exit(0);
	}

	public CompoundTag getChunkData() {
	return this.chunkData;
	}

	public ByteArrayTag getMapData() {
	return this.blockData;
	}

	public void renderLeftRight(int t, float x, float y, float z) {
	GL11.glBegin(GL11.GL_TRIANGLE_STRIP);
	GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t], precalcSpriteSheetToTextureY[t]);
	GL11.glVertex3f(x-0.5f, y+0.5f, z+0.5f);

	GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t]+TEX16, precalcSpriteSheetToTextureY[t]);
	GL11.glVertex3f(x-0.5f, y+0.5f, z-0.5f);

	GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t],precalcSpriteSheetToTextureY[t]+TEX16);
	GL11.glVertex3f(x-0.5f, y-0.5f, z+0.5f);

	GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t]+TEX16, precalcSpriteSheetToTextureY[t]+TEX16);
	GL11.glVertex3f(x-0.5f, y-0.5f, z-0.5f);
	GL11.glEnd();
	}

	public void renderTopDown(int t, float x, float y, float z) {
	GL11.glBegin(GL11.GL_TRIANGLE_STRIP);
	GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t], precalcSpriteSheetToTextureY[t]);
	GL11.glVertex3f(x-0.5f, y-0.5f, z+0.5f);

	GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t]+TEX16, precalcSpriteSheetToTextureY[t]);
	GL11.glVertex3f(x-0.5f, y-0.5f, z-0.5f);

	GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t], precalcSpriteSheetToTextureY[t]+TEX16);
	GL11.glVertex3f(x+0.5f, y-0.5f, z+0.5f);

	GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t]+TEX16, precalcSpriteSheetToTextureY[t]+TEX16);
	GL11.glVertex3f(x+0.5f, y-0.5f, z-0.5f);
	GL11.glEnd();
	}

	public void renderFarNear(int t, float x, float y, float z) {
	GL11.glBegin(GL11.GL_TRIANGLE_STRIP);
	GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t], precalcSpriteSheetToTextureY[t]);
	GL11.glVertex3f(x-0.5f, y+0.5f, z-0.5f);

	GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t]+TEX16, precalcSpriteSheetToTextureY[t]);
	GL11.glVertex3f(x+0.5f, y+0.5f, z-0.5f);

	GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t], precalcSpriteSheetToTextureY[t]+TEX16);
	GL11.glVertex3f(x-0.5f, y-0.5f, z-0.5f);

	GL11.glTexCoord2f(precalcSpriteSheetToTextureX[t]+TEX16, precalcSpriteSheetToTextureY[t]+TEX16);
	GL11.glVertex3f(x+0.5f, y-0.5f, z-0.5f);
	GL11.glEnd();
	}

	public boolean isInRange(float x, float y, float maxDistance) {
	float realX = this.x*16;
	float realY = this.z*16;
	double distance = Math.sqrt(((x-realX) * (x-realX)) + ((y-realY) * (y-realY)));
	return distance < maxDistance;
	}

	public byte getBlock(int x, int y, int z) {
	return blockData.value[y + (z * 128) + (x * 128 * 16)];
	}

	public byte getData(int x, int y, int z) {
	int offset = y + (z * 128) + (x * 128 * 16);
	int halfOffset = offset / 2;
	if(offset % 2 == 0) {
	return (byte) (mapData.value[halfOffset] & 0xF);
	} else {
	return (byte) (mapData.value[halfOffset] >> 4);
	}
	}

	public boolean isSolid(byte i) {
	BLOCK_TYPE block_type = BLOCK_TYPE_MAP.get(i);
	if((i == 0) \|\| (i == TYPE_WATER) \|\| (i == TYPE_WATER_STATIONARY) \|\|
	(i==TYPE_LAVA) \|\| (i==TYPE_LAVA_STATIONARY) \|\|
	(block_type == BLOCK_TYPE.TORCH) \|\| (block_type == BLOCK_TYPE.UPRIGHT) \|\|
	(block_type == BLOCK_TYPE.CROPS)) {
	return false;
	}

	return true;
	}

	public void renderSpecial(float bx, float by, float ex, float ey, float x, float y, float z, float yy, float x1, float x2, float z1, float z2) {

	// GL11.glDisable(GL11.GL_CULL_FACE);
	//GL11.glDisable(GL11.GL_DEPTH_TEST);
	GL11.glBegin(GL11.GL_QUADS);
	GL11.glNormal3f(1.0f, 0.0f, 0.0f);
	GL11.glTexCoord2f(bx, by); GL11.glVertex3f(x+x1+9/16.0f+TEX64, y+yy+1.0f, z+z1);
	GL11.glTexCoord2f(ex, by); GL11.glVertex3f(x+x1+9/16.0f+TEX64, y+yy+1.0f, z+z1+1.0f);
	GL11.glTexCoord2f(ex, ey); GL11.glVertex3f(x+x2+9/16.0f-TEX64, y+yy, z+z2+1.0f);
	GL11.glTexCoord2f(bx, ey); GL11.glVertex3f(x+x2+9/16.0f-TEX64, y+yy, z+z2);

	GL11.glNormal3f(-1.0f, 0.0f, 0.0f);
	GL11.glTexCoord2f(bx, by); GL11.glVertex3f(x+x1+7/16.0f+TEX64, y+yy+1.0f, z+z1+1.0f);
	GL11.glTexCoord2f(ex, by); GL11.glVertex3f(x+x1+7/16.0f+TEX64, y+yy+1.0f, z+z1);
	GL11.glTexCoord2f(ex, ey); GL11.glVertex3f(x+x2+7/16.0f-TEX64, y+yy, z+z2);
	GL11.glTexCoord2f(bx, ey); GL11.glVertex3f(x+x2+7/16.0f-TEX64, y+yy, z+z2+1.0f);

	GL11.glNormal3f(0.0f, 0.0f, 1.0f);
	GL11.glTexCoord2f(bx, by); GL11.glVertex3f(x+x1+1.0f, y+yy+1.0f, z+z1+9/16.0f+TEX64);
	GL11.glTexCoord2f(ex, by); GL11.glVertex3f(x+x1, y+yy+1.0f, z+z1+9/16.0f+TEX64);
	GL11.glTexCoord2f(ex, ey); GL11.glVertex3f(x+x2, y+yy, z+z2+9/16.0f-TEX64);
	GL11.glTexCoord2f(bx, ey); GL11.glVertex3f(x+x2+1.0f, y+yy, z+z2+9/16.0f-TEX64);

	GL11.glNormal3f(0.0f, 0.0f, -1.0f);
	GL11.glTexCoord2f(bx, by); GL11.glVertex3f(x+x1, y+yy+1.0f, z+z1+7/16.0f+TEX64);
	GL11.glTexCoord2f(ex, by); GL11.glVertex3f(x+x1+1.0f, y+yy+1.0f, z+z1+7/16.0f+TEX64);
	GL11.glTexCoord2f(ex, ey); GL11.glVertex3f(x+x2+1.0f, y+yy, z+z2+7/16.0f-TEX64);
	GL11.glTexCoord2f(bx, ey); GL11.glVertex3f(x+x2, y+yy, z+z2+7/16.0f-TEX64);
	x1 = 2.125f; z1 = 2.125f;

	GL11.glNormal3f(0.0f, 1.0f, 0.0f);
	GL11.glTexCoord2f(bx+TEX128, by+TEX128); GL11.glVertex3f(x+x1+9/16.0f, y+yy+10/16.0f, z+z1+7/16.0f);
	GL11.glTexCoord2f(ex-TEX128, by+TEX128); GL11.glVertex3f(x+x1+7/16.0f, y+yy+10/16.0f, z+z1+7/16.0f);
	GL11.glTexCoord2f(ex-TEX128, ey-TEX32); GL11.glVertex3f(x+x1+7/16.0f, y+yy+10/16.0f, z+z1+9/16.0f);
	GL11.glTexCoord2f(bx+TEX128, ey-TEX32); GL11.glVertex3f(x+x1+9/16.0f, y+yy+10/16.0f, z+z1+9/16.0f);

	GL11.glEnd();
	//GL11.glEnable(GL11.GL_DEPTH_TEST);
	//GL11.glEnable(GL11.GL_CULL_FACE);
	}

	public void renderTorch(int xxx, int yyy, int zzz, int block_type) {
	float x1 = 0, x2 = 0, z1 = 0, z2 = 0, yy = 0;
	byte data = getData(xxx, yyy, zzz);
	switch (data) {
	case 1:
	x1 -= 0.125; x2 -= 0.5;
	yy = 3/16.0f; break;
	case 2:
	x1 += 0.125; x2 += 0.5;
	yy = 3/16.0f; break;
	case 3:
	z1 -= 0.125; z2 -= 0.5;
	yy = 3/16.0f; break;
	case 4:
	z1 += 0.125; z2 += 0.5;
	yy = 3/16.0f; break;
	}
	//Light(chunk, x, y, z);
	float x = xxx + this.x*16 -0.5f;
	float z = zzz + this.z*16 -0.5f;
	float y = yyy - 0.5f;
	/*
	*
	* RectangleF rect = new RectangleF(x / 16.0f + 0.00004f, y / 16.0f + 0.00004f,
	1 / 16.0f - 0.00008f, 1 / 16.0f - 0.00008f);
	*/

	float bx,by;
	float ex,ey;

	switch(block_type)
	{
	case MineCraftConstants.BLOCK_REDSTONE_TORCH_ON:
	bx = (TEX16*3) + TEX64;
	by = TEX16 + (5.0f / 16.0f);
	break;
	case MineCraftConstants.BLOCK_REDSTONE_TORCH_OFF:
	bx = (TEX16*3) + TEX64;
	by = (TEX16*2) + (5.0f / 16.0f);
	break;
	default:
	bx = 0.0f+TEX64;
	by = 5.0f / 16.0f;
	}
	ex = bx + TEX16-TEX32;
	ey = by + TEX16;

	renderSpecial(bx, by, ex, ey, x, y, z, yy, x1, x2, z1, z2);
	}

	/***
	* Yanked wholesale from renderTorch
	* @param xxx
	* @param yyy
	* @param zzz
	* @param block_type
	*/
	public void renderUpright(int xxx, int yyy, int zzz, int block_type) {
	float x1 = 0, x2 = 0, z1 = 0, z2 = 0, yy = 0;
	//Light(chunk, x, y, z);
	float x = xxx + this.x*16 -0.5f;
	float z = zzz + this.z*16 -0.5f;
	float y = yyy - 0.5f;

	float bx,by;
	float ex,ey;

	switch(block_type)
	{
	case MineCraftConstants.BLOCK_SAPLING:
	bx = .9375f + TEX64; // 12/16
	by = 0;
	break;
	case MineCraftConstants.BLOCK_RED_ROSE:
	bx = .75f + TEX64; // 12/16
	by = 0;
	break;
	case MineCraftConstants.BLOCK_YELLOW_FLOWER:
	bx = .8125f + TEX64; // 13/16
	by = 0;
	break;
	case MineCraftConstants.BLOCK_RED_MUSHROOM:
	bx = .75f + TEX64; // 12/16
	by = .0625f; // 1/16
	break;
	case MineCraftConstants.BLOCK_BROWN_MUSHROOM:
	default:
	bx = .8125f + TEX64; // 13/16
	by = .0625f; // 1/16
	}
	ex = bx + TEX16-TEX32;
	ey = by + TEX16;

	renderSpecial(bx, by, ex, ey, x, y, z, yy, x1, x2, z1, z2);
	}

	public void renderCrops(int xxx, int yyy, int zzz) {
	float x1 = 0, x2 = 0, z1 = 0, z2 = 0, yy = 0;
	float x = xxx + this.x*16 -0.5f;
	float z = zzz + this.z*16 -0.5f;
	float y = yyy - 0.5f;

	float bx,by;
	float ex,ey;

	byte data = getData(xxx, yyy, zzz);
	switch(data)
	{
	case 7:
	bx = .9375f; // 15/16
	break;
	case 6:
	bx = .875f; // 14/16
	break;
	case 5:
	bx = .8125f; // 13/16
	break;
	case 4:
	bx = .75f; // 12/16
	break;
	case 3:
	bx = .6875f; // 11/16
	break;
	case 2:
	bx = .625f; // 10/16
	break;
	case 1:
	bx = .5625f; // 9/16
	break;
	case 0:
	default:
	bx = 0.5f; // 8/16
	}
	by = .3125f; // 5/16
	ex = bx + TEX16;
	ey = by + TEX16;

	renderSpecial(bx, by, ex, ey, x, y, z, yy, x1, x2, z1, z2);
	}

	public boolean checkSolid(byte block, boolean transpararency) {
	if(block == 0) {
	return true;
	}
	return isSolid(block) == transpararency;
	}

	public void renderWorld(boolean transparency, boolean render_bedrock, boolean onlySelected, boolean[] selectedMap) {
	float worldX = this.x*16;
	float worldZ = this.z*16;
	for(int x=0;x<16;x++) {
	int xOff = (x * 128 * 16);
	for(int z=0;z<16;z++) {
	int zOff = (z * 128);
	int blockOffset = zOff + xOff-1;
	for(int y=0;y<128;y++) {
	blockOffset++;
	byte t = blockData.value[blockOffset];

	if(t == 0) {
	continue;
	}

	/*if(t == TYPE_TORCH) {
	//System.out.println("Torch: " + getData(x,y,z));
	}*/

	int textureId = blockDataToSpriteSheet[t];

	if(textureId == -1) {
	//System.out.println("unknown block type: " + t);
	continue;
	}

	if(transparency && isSolid(t)) {
	continue;
	}
	if(!transparency && !isSolid(t)) {
	continue;
	}
	//if(!transparency && !isSolid(t)) {
	// continue;
	//}

	boolean draw = false;

	if(!onlySelected) {
	boolean above = true;
	boolean below = true;
	boolean left = true;
	boolean right = true;
	boolean near = true;
	boolean far = true;

	if (render_bedrock && t == MineCraftConstants.BLOCK_BEDROCK)
	{
	// This block of code was more or less copied/modified directly from the "else" block
	// below - should see if there's a way we can abstract this instead. Also, I suspect
	// that this is where we'd fix water rendering...

	// check above
	if(y<127 && blockData.value[blockOffset+1] != MineCraftConstants.BLOCK_BEDROCK) {
	draw = true;
	above = false;
	}

	// check below
	if(y>0 && blockData.value[blockOffset-1] != MineCraftConstants.BLOCK_BEDROCK) {
	draw = true;
	below = false;
	}

	// check left;
	if(x>0 && blockData.value[blockOffset-BLOCKSPERCOLUMN] != MineCraftConstants.BLOCK_BEDROCK) {
	draw = true;
	left = false;
	} else if(x==0 && this.x > -63) {
	Chunk leftChunk = level.getChunk(this.x-1, this.z);
	if(leftChunk != null && leftChunk.getBlock(15, y, z) != MineCraftConstants.BLOCK_BEDROCK) {
	draw = true;
	left = false;
	}
	}

	// check right
	if(x<15 && blockData.value[blockOffset+BLOCKSPERCOLUMN] != MineCraftConstants.BLOCK_BEDROCK) {
	draw = true;
	right = false;
	} else if(x==15 && this.x < 63) {
	Chunk rightChunk = level.getChunk(this.x+1,this.z);
	if(rightChunk != null && rightChunk.getBlock(0, y, z) != MineCraftConstants.BLOCK_BEDROCK) {
	draw = true;
	right = false;
	}
	}

	// check near
	if(z>0 && blockData.value[blockOffset-BLOCKSPERROW] != MineCraftConstants.BLOCK_BEDROCK) {
	draw = true;
	near = false;
	} else if(z==0 && this.z > -63) {
	Chunk nearChunk = level.getChunk(this.x,this.z-1);
	if(nearChunk != null && nearChunk.getBlock(x, y, 15) != MineCraftConstants.BLOCK_BEDROCK) {
	draw = true;
	near = false;
	}
	}

	// check far
	if(z<15 && blockData.value[blockOffset+BLOCKSPERROW] != MineCraftConstants.BLOCK_BEDROCK) {
	draw = true;
	far = false;
	} else if(z==15 && this.z < 63) {
	Chunk farChunk = level.getChunk(this.x,this.z+1);
	if(farChunk != null && farChunk.getBlock(x, y, 0) != MineCraftConstants.BLOCK_BEDROCK) {
	draw = true;
	far = false;
	}
	}
	}
	else
	{
	// check above
	if(y<127 && checkSolid(blockData.value[blockOffset+1], transparency)) {
	draw = true;
	above = false;
	}

	// check below
	if(y>0 && checkSolid(blockData.value[blockOffset-1], transparency)) {
	draw = true;
	below = false;
	}

	// check left;
	if(x>0 && checkSolid(blockData.value[blockOffset-BLOCKSPERCOLUMN], transparency)) {
	draw = true;
	left = false;
	} else if(x==0 && this.x > -63) {
	Chunk leftChunk = level.getChunk(this.x-1, this.z);
	if(leftChunk != null && checkSolid(leftChunk.getBlock(15, y, z), transparency)) {
	draw = true;
	left = false;
	}
	}

	// check right
	if(x<15 && checkSolid(blockData.value[blockOffset+BLOCKSPERCOLUMN], transparency)) {
	draw = true;
	right = false;
	} else if(x==15 && this.x < 63) {
	Chunk rightChunk = level.getChunk(this.x+1,this.z);
	if(rightChunk != null && checkSolid(rightChunk.getBlock(0, y, z), transparency)) {
	draw = true;
	right = false;
	}
	}

	// check near
	if(z>0 && checkSolid(blockData.value[blockOffset-BLOCKSPERROW], transparency)) {
	draw = true;
	near = false;
	} else if(z==0 && this.z > -63) {
	Chunk nearChunk = level.getChunk(this.x,this.z-1);
	if(nearChunk != null && checkSolid(nearChunk.getBlock(x, y, 15), transparency)) {
	draw = true;
	near = false;
	}
	}

	// check far
	if(z<15 && checkSolid(blockData.value[blockOffset+BLOCKSPERROW], transparency)) {
	draw = true;
	far = false;
	} else if(z==15 && this.z < 63) {
	Chunk farChunk = level.getChunk(this.x,this.z+1);
	if(farChunk != null && checkSolid(farChunk.getBlock(x, y, 0), transparency)) {
	draw = true;
	far = false;
	}
	}
	}

	switch(BLOCK_TYPE_MAP.get(t))
	{
	case TORCH:
	renderTorch(x,y,z,t);
	break;
	case UPRIGHT:
	renderUpright(x,y,z,t);
	break;
	case CROPS:
	renderCrops(x,y,z);
	break;
	default:
	// if we have to draw this block
	if(draw) {
	if(!near) this.renderFarNear(textureId, worldX+x, y, worldZ+z);
	if(!far) this.renderFarNear(textureId, worldX+x, y, worldZ+z+1);

	if(!below) this.renderTopDown(textureId, worldX+x, y, worldZ+z);
	if(!above) this.renderTopDown(textureId, worldX+x, y+1, worldZ+z);

	if(!left) this.renderLeftRight(textureId, worldX+x, y, worldZ+z);
	if(!right) this.renderLeftRight(textureId, worldX+x+1, y, worldZ+z);
	}
	}
	} else {
	draw = false;
	for(int i=0;i<selectedMap.length;i++) {
	if(selectedMap[i] && HIGHLIGHT_ORES[i] == t) {
	draw = true;
	break;
	}
	}
	if(draw) {
	this.renderFarNear(textureId, worldX+x, y, worldZ+z);
	this.renderFarNear(textureId, worldX+x, y, worldZ+z+1);

	this.renderTopDown(textureId, worldX+x, y, worldZ+z);
	this.renderTopDown(textureId, worldX+x, y+1, worldZ+z);

	this.renderLeftRight(textureId, worldX+x, y, worldZ+z);
	this.renderLeftRight(textureId, worldX+x+1, y, worldZ+z);
	}
	}

	}
	}
	}
	}

	public void renderSolid(boolean render_bedrock) {
	if(isDirty) {
	GL11.glNewList(this.displayListNum, GL11.GL_COMPILE);
	renderWorld(false, render_bedrock, false, null);
	GL11.glEndList();
	GL11.glNewList(this.transparentListNum, GL11.GL_COMPILE);
	renderWorld(true, false, false, null);
	GL11.glEndList();
	this.isDirty = false;
	}
	GL11.glCallList(this.displayListNum);
	}

	public void renderTransparency() {
	GL11.glCallList(this.transparentListNum);
	}

	public void renderSelected(boolean[] selectedMap) {
	if(isSelectedDirty) {
	GL11.glNewList(this.selectedDisplayListNum, GL11.GL_COMPILE);
	renderWorld(false, false, true, selectedMap);
	GL11.glEndList();
	this.isSelectedDirty = false;
	}
	GL11.glCallList(this.selectedDisplayListNum);
	}
	}