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package ihl.enviroment;
import java.util.BitSet;
import java.util.HashSet;
import java.util.Set;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import ihl.IHLMod;
import ihl.utils.IHLMathUtils;
import net.minecraft.block.Block;
import net.minecraft.client.Minecraft;
import net.minecraft.init.Blocks;
import net.minecraft.world.World;
@SideOnly(value = Side.CLIENT)
public class LightHandler {
private int[][] directionMasks;
private int[][] vectors;
private int bits;
private int halfValue;
private int lightBitsPerDimension = 10;
private int maxLightRadius = (1 << lightBitsPerDimension - 1) - 1;
private int bitmask = (1 << lightBitsPerDimension) - 1;
public final Set<LightSource> lightSources = new HashSet<LightSource>();
public LightHandler() {
this.directionMasks = IHLMod.explosionHandler.directionMasks;
this.vectors = IHLMod.explosionHandler.vectors;
this.bits = IHLMod.explosionHandler.bits;
this.halfValue = IHLMod.explosionHandler.halfValue;
}
public int encodeXYZ(int x, int y, int z) {
return x + maxLightRadius << lightBitsPerDimension * 2 | y + maxLightRadius << lightBitsPerDimension
| z + maxLightRadius;
}
public int[] decodeXYZ(int l) {
return new int[] { (l >>> lightBitsPerDimension * 2) - maxLightRadius,
((l >>> lightBitsPerDimension) & bitmask) - maxLightRadius, (l & bitmask) - maxLightRadius };
}
public LightSource calculateLightSource(World world, int sourceX, int sourceY, int sourceZ, int power, int red,
int green, int blue, double[] ds) {
LightSource lightSource = new LightSource(sourceX, sourceY, sourceZ, red, green, blue, power);
int[] borders = { sourceX, sourceY, sourceZ, sourceX, sourceY, sourceZ };
int[] evSource = { sourceX, sourceY, sourceZ };
int[] lightSourceXYZ = { sourceX, sourceY, sourceZ };
for (int i = 0; i < directionMasks.length; i++) {
int[] directionMask = directionMasks[i];
this.litBlocksAndGetDescendants(world, evSource, lightSourceXYZ, lightSource.illuminatedBlocks, 0, power>>1,
directionMask, borders, ds);
}
lightSource.setBorders(borders[0], borders[1], borders[2], borders[3], borders[4], borders[5]);
return lightSource;
}
private void litBlocksAndGetDescendants(World world, int[] evSource, int[] lightSource, BitSet illuminatedBlocksSet,
int ev, int power, int[] directionMask, int[] borders, double[] ds) {
power = this.getNewPower(world, ev, evSource, lightSource, power, directionMask, illuminatedBlocksSet, borders,
ds);
power--;
if (power > 1) {
if (vectors[ev].length == 0) {
int[] xyz = IHLMod.explosionHandler.decodeXYZ(ev);
int xb = xyz[0] >> bits - 1;
int yb = xyz[1] >> bits - 1;
int zb = xyz[2] >> bits - 1;
int hashb = xb << 2 | yb << 1 | zb;
xyz[0] -= xb * halfValue;
xyz[1] -= yb * halfValue;
xyz[2] -= zb * halfValue;
if (hashb == 0 || xb > 1 || yb > 1 || zb > 1) {
throw new ArithmeticException("End vectors shall be higher than half value");
}
int ev2 = IHLMod.explosionHandler.encodeXYZ(xyz[0], xyz[1], xyz[2]);
int[] nextEVSource = { evSource[0] + xb * halfValue * directionMask[0],
evSource[1] + yb * halfValue * directionMask[1],
evSource[2] + zb * halfValue * directionMask[2] };
litBlocksAndGetDescendants(world, nextEVSource, lightSource, illuminatedBlocksSet, ev2, power,
directionMask, borders, ds);
} else {
for (int d1 : this.vectors[ev]) {
litBlocksAndGetDescendants(world, evSource, lightSource, illuminatedBlocksSet, d1, power,
directionMask, borders, ds);
}
}
}
}
private int getNewPower(World world, int ev, int[] evSource, int[] lightSource, int power, int[] directionMask,
BitSet illuminatedBlocksSet, int[] borders, double[] ds) {
int power1 = power;
int[] xyz = IHLMod.explosionHandler.decodeXYZ(ev);
int absX = xyz[0] * directionMask[0] + evSource[0];
int absY = xyz[1] * directionMask[1] + evSource[1];
int absZ = xyz[2] * directionMask[2] + evSource[2];
if (absX < borders[0]) {
borders[0] = absX;
} else if (absY < borders[1]) {
borders[1] = absY;
} else if (absZ < borders[2]) {
borders[2] = absZ;
} else if (absX > borders[3]) {
borders[3] = absX;
} else if (absY > borders[4]) {
borders[4] = absY;
} else if (absZ > borders[5]) {
borders[5] = absZ;
}
power1 = power1 * (255 - world.getBlockLightOpacity(absX, absY, absZ)) / 255;
int lightBitAddress = this.encodeXYZ(absX - lightSource[0], absY - lightSource[1], absZ - lightSource[2]);
illuminatedBlocksSet.set(lightBitAddress);
if (ds != null) {
float dx = (float) (absX - ds[0]);
float dy = (float) (absY - ds[1]);
float dz = (float) (absZ - ds[2]);
float sqd = dx * dx + dy * dy + dz * dz;
float d = IHLMathUtils.sqrt(sqd);
float dx1 = (float) (ds[3] * d);
float dy1 = (float) (ds[4] * d);
float dz1 = (float) (ds[5] * d);
float ddx = dx - dx1;
float ddy = dy - dy1;
float ddz = dz - dz1;
float sqr = ddx * ddx + ddy * ddy + ddz * ddz;
float sqrmax = (float) ds[6] * sqd + 4f;
if (sqr > sqrmax) {
return 0;
}
}
return power1;
}
public void addLightSource(LightSource lightSource) {
/* IHLMod.log.info("Added light source at area from "+lightSource.fromX+";"+lightSource.fromY+";"+lightSource.fromZ+
" to "+lightSource.toX+";"+lightSource.toY+";"+lightSource.toZ);*/
this.lightSources.add(lightSource);
Minecraft.getMinecraft().theWorld.markBlockRangeForRenderUpdate(
lightSource.fromX,
lightSource.fromY,
lightSource.fromZ,
lightSource.toX,
lightSource.toY,
lightSource.toZ);
}
public void removeLightSource(LightSource lightSource) {
if(!this.lightSources.remove(lightSource)){
throw new IllegalArgumentException("Requested light source is not presented.");
}
/* IHLMod.log.info("Removing light source at area from "+lightSource.fromX+";"+lightSource.fromY+";"+lightSource.fromZ+
" to "+lightSource.toX+";"+lightSource.toY+";"+lightSource.toZ);*/
Minecraft.getMinecraft().theWorld.markBlockRangeForRenderUpdate(
lightSource.fromX,
lightSource.fromY,
lightSource.fromZ,
lightSource.toX,
lightSource.toY,
lightSource.toZ);
}
}
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