@Override
public Float64Vector getNormal(Coordinate point) {
if (!point.zoomOut(Coordinate.OFFSET_BLOCK_CHUNK).equals(location)) {
throw new IllegalArgumentException();
}
point = point.subCoordinate(Coordinate.OFFSET_BLOCK_CHUNK);
return normals[point.getX()][point.getY()];
}
private Float64Vector[][] fromNormalMap(NormalMap source) {
Float64Vector[][] normals = new Float64Vector[16][16];
Coordinate chunkOrigin = location.zoomIn(Coordinate.OFFSET_BLOCK_CHUNK);
for (int x = 0; x < 16; x++) {
for (int y = 0; y < 16; y++) {
normals[x][y] =
source.getNormal(chunkOrigin.plus(new Coordinate(x, y, Coordinate.LEVEL_BLOCK)));
}
}
return normals;
}
private static double computeDiffuseShading(
ChunkSnapshot chunkSnapshot, int x, int z, NormalMap nm) {
Float64Vector n =
nm.getNormal(
Coordinate.fromSnapshot(chunkSnapshot)
.zoomIn(Coordinate.OFFSET_BLOCK_CHUNK)
.plus(new Coordinate(x, z, Coordinate.LEVEL_BLOCK)));
Float64Vector light = Float64Vector.valueOf(-1, -1, -1);
if (n == null) {
return -1;
}
double shading = n.times(light).divide((n.norm().times(light.norm()))).doubleValue();
return ((shading + 1) * 0.4) + 0.15;
}
@Override
public void render(ChunkSnapshot chunkSnapshot) {
BufferedImage image = ImageProvider.createImage(Coordinate.SIZE_CHUNK);
Graphics2D g = (Graphics2D) image.getGraphics();
for (int x = 0; x < 16; x++) {
for (int z = 0; z < 16; z++) {
// TODO: Handle cases where we can start at an opaque non-terrain block
for (int y = TerrainHelper.getTerrainHeight(x, z, chunkSnapshot);
y <= chunkSnapshot.getHighestBlockYAt(x, z);
y++) {
Material material = Material.getMaterial(chunkSnapshot.getBlockTypeId(x, y, z));
Color color = getMaterialColor(material, chunkSnapshot, x, y, z);
if (TerrainHelper.isTerrain(material)) {
double shading = computeDiffuseShading(chunkSnapshot, x, z, this.normalMap);
if (shading >= 0) {
color = tintOrShadeColor(color, shading, 1.0);
}
} else if (TerrainHelper.isStructure(material)) {
double shading = computeDiffuseShading(chunkSnapshot, x, z, this.structureMap);
if (shading >= 0) {
if (material.equals(Material.LEAVES)) {
color = tintOrShadeColor(color, shading, 0.3);
} else {
color = tintOrShadeColor(color, shading, 1.0);
}
}
}
g.setColor(color);
g.fillRect(x, z, 1, 1);
}
}
}
imageProvider.setImage(Coordinate.fromSnapshot(chunkSnapshot), image);
}