add (hopefully) branchless version of setBlock

babbaj · Jul 10, 2023 · f6ed5da · f6ed5da
1 parent 70dfe3a
commit f6ed5da
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Showing 2 changed files with 13 additions and 1 deletion.
diff --git a/java/build.gradle b/java/build.gradle
@@ -23,7 +23,7 @@ plugins {
 }
 
 group = 'dev.babbaj'
-version = '0.24'
+version = '0.25'
 
 java {
     toolchain {

diff --git a/java/src/main/java/dev/babbaj/pathfinder/Octree.java b/java/src/main/java/dev/babbaj/pathfinder/Octree.java
@@ -73,6 +73,18 @@ public static void setBlock(long pointer, int x, int y, int z, boolean solid) {
         UNSAFE.putByte(x2Ptr, x2);
     }
 
+    public static void initBlock(long pointer, int x, int y, int z, boolean solid) {
+        final long x2Ptr = getX2Ptr(pointer, x, y, z);
+        final int bit = bitIndex(x, y, z);
+        byte x2 = UNSAFE.getByte(x2Ptr);
+
+        // this is more likely to be branchless than setBlock
+        int b = solid ? 1 : 0;
+        x2 |= (b << bit);
+
+        UNSAFE.putByte(x2Ptr, x2);
+    }
+
     public static boolean getBlock(long pointer, int x, int y, int z) {
         final long x2Ptr = getX2Ptr(pointer, x, y, z);
         final int bit = bitIndex(x, y, z);