001package net.minecraft.world;
002
003import cpw.mods.fml.relauncher.Side;
004import cpw.mods.fml.relauncher.SideOnly;
005import net.minecraft.block.Block;
006import net.minecraft.block.BlockHalfSlab;
007import net.minecraft.block.BlockStairs;
008import net.minecraft.block.material.Material;
009import net.minecraft.tileentity.TileEntity;
010import net.minecraft.util.Vec3Pool;
011import net.minecraft.world.biome.BiomeGenBase;
012import net.minecraft.world.chunk.Chunk;
013
014public class ChunkCache implements IBlockAccess
015{
016    private int chunkX;
017    private int chunkZ;
018    private Chunk[][] chunkArray;
019
020    /** set by !chunk.getAreLevelsEmpty */
021    private boolean hasExtendedLevels;
022
023    /** Reference to the World object. */
024    private World worldObj;
025
026    public ChunkCache(World par1World, int par2, int par3, int par4, int par5, int par6, int par7)
027    {
028        this.worldObj = par1World;
029        this.chunkX = par2 >> 4;
030        this.chunkZ = par4 >> 4;
031        int k1 = par5 >> 4;
032        int l1 = par7 >> 4;
033        this.chunkArray = new Chunk[k1 - this.chunkX + 1][l1 - this.chunkZ + 1];
034        this.hasExtendedLevels = true;
035
036        for (int i2 = this.chunkX; i2 <= k1; ++i2)
037        {
038            for (int j2 = this.chunkZ; j2 <= l1; ++j2)
039            {
040                Chunk chunk = par1World.getChunkFromChunkCoords(i2, j2);
041
042                if (chunk != null)
043                {
044                    this.chunkArray[i2 - this.chunkX][j2 - this.chunkZ] = chunk;
045
046                    if (!chunk.getAreLevelsEmpty(par3, par6))
047                    {
048                        this.hasExtendedLevels = false;
049                    }
050                }
051            }
052        }
053    }
054
055    @SideOnly(Side.CLIENT)
056
057    /**
058     * set by !chunk.getAreLevelsEmpty
059     */
060    public boolean extendedLevelsInChunkCache()
061    {
062        return this.hasExtendedLevels;
063    }
064
065    /**
066     * Returns the block ID at coords x,y,z
067     */
068    public int getBlockId(int par1, int par2, int par3)
069    {
070        if (par2 < 0)
071        {
072            return 0;
073        }
074        else if (par2 >= 256)
075        {
076            return 0;
077        }
078        else
079        {
080            int l = (par1 >> 4) - this.chunkX;
081            int i1 = (par3 >> 4) - this.chunkZ;
082
083            if (l >= 0 && l < this.chunkArray.length && i1 >= 0 && i1 < this.chunkArray[l].length)
084            {
085                Chunk chunk = this.chunkArray[l][i1];
086                return chunk == null ? 0 : chunk.getBlockID(par1 & 15, par2, par3 & 15);
087            }
088            else
089            {
090                return 0;
091            }
092        }
093    }
094
095    /**
096     * Returns the TileEntity associated with a given block in X,Y,Z coordinates, or null if no TileEntity exists
097     */
098    public TileEntity getBlockTileEntity(int par1, int par2, int par3)
099    {
100        int l = (par1 >> 4) - this.chunkX;
101        int i1 = (par3 >> 4) - this.chunkZ;
102        if (l >= 0 && l < this.chunkArray.length && i1 >= 0 && i1 < this.chunkArray[l].length)
103        {
104            Chunk chunk = this.chunkArray[l][i1];
105            return chunk == null ? null : chunk.getChunkBlockTileEntity(par1 & 15, par2, par3 & 15);
106        }
107        else
108        {
109            return null;
110        }
111    }
112
113    @SideOnly(Side.CLIENT)
114    public float getBrightness(int par1, int par2, int par3, int par4)
115    {
116        int i1 = this.getLightValue(par1, par2, par3);
117
118        if (i1 < par4)
119        {
120            i1 = par4;
121        }
122
123        return this.worldObj.provider.lightBrightnessTable[i1];
124    }
125
126    @SideOnly(Side.CLIENT)
127
128    /**
129     * Any Light rendered on a 1.8 Block goes through here
130     */
131    public int getLightBrightnessForSkyBlocks(int par1, int par2, int par3, int par4)
132    {
133        int i1 = this.getSkyBlockTypeBrightness(EnumSkyBlock.Sky, par1, par2, par3);
134        int j1 = this.getSkyBlockTypeBrightness(EnumSkyBlock.Block, par1, par2, par3);
135
136        if (j1 < par4)
137        {
138            j1 = par4;
139        }
140
141        return i1 << 20 | j1 << 4;
142    }
143
144    /**
145     * Returns the block metadata at coords x,y,z
146     */
147    public int getBlockMetadata(int par1, int par2, int par3)
148    {
149        if (par2 < 0)
150        {
151            return 0;
152        }
153        else if (par2 >= 256)
154        {
155            return 0;
156        }
157        else
158        {
159            int l = (par1 >> 4) - this.chunkX;
160            int i1 = (par3 >> 4) - this.chunkZ;
161            if (l >= 0 && l < this.chunkArray.length && i1 >= 0 && i1 < this.chunkArray[l].length)
162            {
163                Chunk chunk = this.chunkArray[l][i1];
164                return chunk == null ? 0 : chunk.getBlockMetadata(par1 & 15, par2, par3 & 15);
165            }
166            return 0;
167        }
168    }
169
170    @SideOnly(Side.CLIENT)
171
172    /**
173     * Returns how bright the block is shown as which is the block's light value looked up in a lookup table (light
174     * values aren't linear for brightness). Args: x, y, z
175     */
176    public float getLightBrightness(int par1, int par2, int par3)
177    {
178        return this.worldObj.provider.lightBrightnessTable[this.getLightValue(par1, par2, par3)];
179    }
180
181    @SideOnly(Side.CLIENT)
182
183    /**
184     * Gets the light value of the specified block coords. Args: x, y, z
185     */
186    public int getLightValue(int par1, int par2, int par3)
187    {
188        return this.getLightValueExt(par1, par2, par3, true);
189    }
190
191    @SideOnly(Side.CLIENT)
192
193    /**
194     * Get light value with flag
195     */
196    public int getLightValueExt(int par1, int par2, int par3, boolean par4)
197    {
198        if (par1 >= -30000000 && par3 >= -30000000 && par1 < 30000000 && par3 <= 30000000)
199        {
200            int l;
201            int i1;
202
203            if (par4)
204            {
205                l = this.getBlockId(par1, par2, par3);
206
207                if (l == Block.stoneSingleSlab.blockID || l == Block.woodSingleSlab.blockID || l == Block.tilledField.blockID || l == Block.stairCompactPlanks.blockID || l == Block.stairCompactCobblestone.blockID)
208                {
209                    i1 = this.getLightValueExt(par1, par2 + 1, par3, false);
210                    int j1 = this.getLightValueExt(par1 + 1, par2, par3, false);
211                    int k1 = this.getLightValueExt(par1 - 1, par2, par3, false);
212                    int l1 = this.getLightValueExt(par1, par2, par3 + 1, false);
213                    int i2 = this.getLightValueExt(par1, par2, par3 - 1, false);
214
215                    if (j1 > i1)
216                    {
217                        i1 = j1;
218                    }
219
220                    if (k1 > i1)
221                    {
222                        i1 = k1;
223                    }
224
225                    if (l1 > i1)
226                    {
227                        i1 = l1;
228                    }
229
230                    if (i2 > i1)
231                    {
232                        i1 = i2;
233                    }
234
235                    return i1;
236                }
237            }
238
239            if (par2 < 0)
240            {
241                return 0;
242            }
243            else if (par2 >= 256)
244            {
245                l = 15 - this.worldObj.skylightSubtracted;
246
247                if (l < 0)
248                {
249                    l = 0;
250                }
251
252                return l;
253            }
254            else
255            {
256                l = (par1 >> 4) - this.chunkX;
257                i1 = (par3 >> 4) - this.chunkZ;
258                return this.chunkArray[l][i1].getBlockLightValue(par1 & 15, par2, par3 & 15, this.worldObj.skylightSubtracted);
259            }
260        }
261        else
262        {
263            return 15;
264        }
265    }
266
267    /**
268     * Returns the block's material.
269     */
270    public Material getBlockMaterial(int par1, int par2, int par3)
271    {
272        int l = this.getBlockId(par1, par2, par3);
273        return l == 0 ? Material.air : Block.blocksList[l].blockMaterial;
274    }
275
276    @SideOnly(Side.CLIENT)
277
278    /**
279     * Gets the biome for a given set of x/z coordinates
280     */
281    public BiomeGenBase getBiomeGenForCoords(int par1, int par2)
282    {
283        return this.worldObj.getBiomeGenForCoords(par1, par2);
284    }
285
286    @SideOnly(Side.CLIENT)
287
288    /**
289     * Returns true if the block at the specified coordinates is an opaque cube. Args: x, y, z
290     */
291    public boolean isBlockOpaqueCube(int par1, int par2, int par3)
292    {
293        Block block = Block.blocksList[this.getBlockId(par1, par2, par3)];
294        return block == null ? false : block.isOpaqueCube();
295    }
296
297    /**
298     * Indicate if a material is a normal solid opaque cube.
299     */
300    public boolean isBlockNormalCube(int par1, int par2, int par3)
301    {
302        Block block = Block.blocksList[this.getBlockId(par1, par2, par3)];
303        return block == null ? false : block.blockMaterial.blocksMovement() && block.renderAsNormalBlock();
304    }
305
306    @SideOnly(Side.CLIENT)
307
308    /**
309     * Returns true if the block at the given coordinate has a solid (buildable) top surface.
310     */
311    public boolean doesBlockHaveSolidTopSurface(int par1, int par2, int par3)
312    {
313        Block block = Block.blocksList[this.getBlockId(par1, par2, par3)];
314        return block == null ? false : (block.blockMaterial.isOpaque() && block.renderAsNormalBlock() ? true : (block instanceof BlockStairs ? (this.getBlockMetadata(par1, par2, par3) & 4) == 4 : (block instanceof BlockHalfSlab ? (this.getBlockMetadata(par1, par2, par3) & 8) == 8 : false)));
315    }
316
317    /**
318     * Return the Vec3Pool object for this world.
319     */
320    public Vec3Pool getWorldVec3Pool()
321    {
322        return this.worldObj.getWorldVec3Pool();
323    }
324
325    @SideOnly(Side.CLIENT)
326
327    /**
328     * Returns true if the block at the specified coordinates is empty
329     */
330    public boolean isAirBlock(int par1, int par2, int par3)
331    {
332        Block block = Block.blocksList[this.getBlockId(par1, par2, par3)];
333        return block == null;
334    }
335
336    @SideOnly(Side.CLIENT)
337
338    /**
339     * Brightness for SkyBlock.Sky is clear white and (through color computing it is assumed) DEPENDENT ON DAYTIME.
340     * Brightness for SkyBlock.Block is yellowish and independent.
341     */
342    public int getSkyBlockTypeBrightness(EnumSkyBlock par1EnumSkyBlock, int par2, int par3, int par4)
343    {
344        if (par3 < 0)
345        {
346            par3 = 0;
347        }
348
349        if (par3 >= 256)
350        {
351            par3 = 255;
352        }
353
354        if (par3 >= 0 && par3 < 256 && par2 >= -30000000 && par4 >= -30000000 && par2 < 30000000 && par4 <= 30000000)
355        {
356            if (par1EnumSkyBlock == EnumSkyBlock.Sky && this.worldObj.provider.hasNoSky)
357            {
358                return 0;
359            }
360            else
361            {
362                int l;
363                int i1;
364
365                if (Block.useNeighborBrightness[this.getBlockId(par2, par3, par4)])
366                {
367                    l = this.getSpecialBlockBrightness(par1EnumSkyBlock, par2, par3 + 1, par4);
368                    i1 = this.getSpecialBlockBrightness(par1EnumSkyBlock, par2 + 1, par3, par4);
369                    int j1 = this.getSpecialBlockBrightness(par1EnumSkyBlock, par2 - 1, par3, par4);
370                    int k1 = this.getSpecialBlockBrightness(par1EnumSkyBlock, par2, par3, par4 + 1);
371                    int l1 = this.getSpecialBlockBrightness(par1EnumSkyBlock, par2, par3, par4 - 1);
372
373                    if (i1 > l)
374                    {
375                        l = i1;
376                    }
377
378                    if (j1 > l)
379                    {
380                        l = j1;
381                    }
382
383                    if (k1 > l)
384                    {
385                        l = k1;
386                    }
387
388                    if (l1 > l)
389                    {
390                        l = l1;
391                    }
392
393                    return l;
394                }
395                else
396                {
397                    l = (par2 >> 4) - this.chunkX;
398                    i1 = (par4 >> 4) - this.chunkZ;
399                    return this.chunkArray[l][i1].getSavedLightValue(par1EnumSkyBlock, par2 & 15, par3, par4 & 15);
400                }
401            }
402        }
403        else
404        {
405            return par1EnumSkyBlock.defaultLightValue;
406        }
407    }
408
409    @SideOnly(Side.CLIENT)
410
411    /**
412     * is only used on stairs and tilled fields
413     */
414    public int getSpecialBlockBrightness(EnumSkyBlock par1EnumSkyBlock, int par2, int par3, int par4)
415    {
416        if (par3 < 0)
417        {
418            par3 = 0;
419        }
420
421        if (par3 >= 256)
422        {
423            par3 = 255;
424        }
425
426        if (par3 >= 0 && par3 < 256 && par2 >= -30000000 && par4 >= -30000000 && par2 < 30000000 && par4 <= 30000000)
427        {
428            int l = (par2 >> 4) - this.chunkX;
429            int i1 = (par4 >> 4) - this.chunkZ;
430            return this.chunkArray[l][i1].getSavedLightValue(par1EnumSkyBlock, par2 & 15, par3, par4 & 15);
431        }
432        else
433        {
434            return par1EnumSkyBlock.defaultLightValue;
435        }
436    }
437
438    @SideOnly(Side.CLIENT)
439
440    /**
441     * Returns current world height.
442     */
443    public int getHeight()
444    {
445        return 256;
446    }
447
448    /**
449     * Is this block powering in the specified direction Args: x, y, z, direction
450     */
451    public int isBlockProvidingPowerTo(int par1, int par2, int par3, int par4)
452    {
453        int i1 = this.getBlockId(par1, par2, par3);
454        return i1 == 0 ? 0 : Block.blocksList[i1].isProvidingStrongPower(this, par1, par2, par3, par4);
455    }
456}