AddConvexRadiusTab: refactor getSupport() to use a direct buffer

Author: stephengold

src/main/java/com/github/stephengold/joltjni/AddConvexRadiusTab.java

@@ -22,6 +22,7 @@ of this software and associated documentation files (the "Software"), to deal
 package com.github.stephengold.joltjni;
 
 import com.github.stephengold.joltjni.readonly.Vec3Arg;
+import java.nio.FloatBuffer;
 
 /**
  * Add convex radius to a {@code TransformedAaBox}. (native type:
@@ -58,7 +59,7 @@ public Vec3 getSupport(Vec3Arg direction) {
         float dx = direction.getX();
         float dy = direction.getY();
         float dz = direction.getZ();
-        float[] storeFloats = new float[3];
+        FloatBuffer storeFloats = Temporaries.floatBuffer1.get();
         getSupport(addVa, dx, dy, dz, storeFloats);
         Vec3 result = new Vec3(storeFloats);
 
@@ -72,5 +73,5 @@ public Vec3 getSupport(Vec3Arg direction) {
     native private static void free(long addVa);
 
     native private static void getSupport(
-            long addVa, float dx, float dy, float dz, float[] storeFloats);
+            long addVa, float dx, float dy, float dz, FloatBuffer storeFloats);
 }

src/main/native/glue/a/AddConvexRadiusTab.cpp

@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2025 Stephen Gold
+Copyright (c) 2025-2026 Stephen Gold
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -59,20 +59,18 @@ JNIEXPORT void JNICALL Java_com_github_stephengold_joltjni_AddConvexRadiusTab_fr
 /*
  * Class:     com_github_stephengold_joltjni_AddConvexRadiusTab
  * Method:    getSupport
- * Signature: (JFFF[F)V
+ * Signature: (JFFFLjava/nio/FloatBuffer;)V
  */
 JNIEXPORT void JNICALL Java_com_github_stephengold_joltjni_AddConvexRadiusTab_getSupport
   (JNIEnv *pEnv, jclass, jlong addVa, jfloat dx, jfloat dy, jfloat dz,
-  jfloatArray storeFloats) {
+  jobject storeFloats) {
     const AddConvexRadius<TransformedConvexObject<AABox>> * const pAdd
             = reinterpret_cast<AddConvexRadius<TransformedConvexObject<AABox>> *> (addVa);
     const Vec3 direction(dx, dy, dz);
     const Vec3 result = pAdd->GetSupport(direction);
-    jboolean isCopy;
-    jfloat * const pStoreFloats
-            = pEnv->GetFloatArrayElements(storeFloats, &isCopy);
+    DIRECT_FLOAT_BUFFER(pEnv, storeFloats, pStoreFloats, capacityFloats);
+    JPH_ASSERT(capacityFloats >= 3);
     pStoreFloats[0] = result.GetX();
     pStoreFloats[1] = result.GetY();
     pStoreFloats[2] = result.GetZ();
-    pEnv->ReleaseFloatArrayElements(storeFloats, pStoreFloats, 0);
 }