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Pack normals into one byte instead of 4 to save space :)

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This commit is contained in:
Lukas Rieger (Blue) 2024-02-23 18:02:29 +01:00
parent 6e68a8f0e0
commit 40119127ee
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GPG Key ID: AA33883B1BBA03E6
1 changed files with 10 additions and 5 deletions
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15
BlueMapCore/src/main/java/de/bluecolored/bluemap/core/map/hires/PRBMWriter.java
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@ -87,9 +87,9 @@ private void writeNormalArray(TileModel model) throws IOException {
writeString("normal"); writeString("normal");
out.write( out.write(
ATTRIBUTE_TYPE_FLOAT | ATTRIBUTE_TYPE_FLOAT |
ATTRIBUTE_NOT_NORMALIZED | ATTRIBUTE_NORMALIZED |
ATTRIBUTE_CARDINALITY_3D_VEC | ATTRIBUTE_CARDINALITY_3D_VEC |
ATTRIBUTE_ENCODING_SIGNED_32BIT_FLOAT ATTRIBUTE_ENCODING_SIGNED_8BIT_INT
); );
writePadding(); writePadding();
@ -105,9 +105,9 @@ private void writeNormalArray(TileModel model) throws IOException {
); );
for (j = 0; j < 3; j++) { // all 3 points for (j = 0; j < 3; j++) { // all 3 points
writeFloat(normal.x); writeNormalizedSignedByteValue(normal.x);
writeFloat(normal.y); writeNormalizedSignedByteValue(normal.y);
writeFloat(normal.z); writeNormalizedSignedByteValue(normal.z);
} }
} }
} }
@ -283,6 +283,11 @@ private void writeFloat(float value) throws IOException {
write4byteValue(Float.floatToIntBits(value)); write4byteValue(Float.floatToIntBits(value));
} }
private void writeNormalizedSignedByteValue(float value) throws IOException {
byte normalized = (byte) (value * 0x80 - 0.5);
out.write(normalized & 0xFF);
}
private void writeNormalizedUnsignedByteValue(float value) throws IOException { private void writeNormalizedUnsignedByteValue(float value) throws IOException {
int normalized = (int) (value * 0xFF); int normalized = (int) (value * 0xFF);
out.write(normalized & 0xFF); out.write(normalized & 0xFF);