trying bytebuf and FloatVector

src/net/torvald/gdx/graphics/VectorArray.kt

@@ -0,0 +1,67 @@
+package net.torvald.gdx.graphics
+
+import jdk.incubator.vector.FloatVector
+import jdk.incubator.vector.FloatVector.SPECIES_128
+import java.nio.ByteBuffer
+import java.nio.ByteOrder
+
+/**
+ * Created by minjaesong on 2023-01-18.
+ */
+class VectorArray(val width: Int, val height: Int) {
+
+    companion object {
+        val SPECIES = SPECIES_128
+        val BO = ByteOrder.nativeOrder()
+        val NULLVEC = FloatVector.broadcast(VectorArray.SPECIES, 0f)
+    }
+
+    val TOTAL_SIZE_IN_BYTES = 16 * (width + 1) * (height + 1)
+    private val array = ByteBuffer.allocateDirect(TOTAL_SIZE_IN_BYTES)
+
+    private inline fun toAddr(x: Int, y: Int) = 4 * (y * width + x)
+
+
+    init {
+        array.clear()
+        array.rewind()
+    }
+
+    private fun _getVec(a: Int) = FloatVector.fromByteBuffer(SPECIES, array, a, BO)
+
+    fun getVec(x: Int, y: Int): FloatVector {
+        val a = toAddr(x, y)
+        return FloatVector.fromByteBuffer(SPECIES, array, a, BO)
+    }
+
+    private fun _setVec(a: Int, value: FloatVector) {
+        value.intoByteBuffer(array, a, BO)
+    }
+
+    fun setVec(x: Int, y: Int, value: FloatVector) {
+        val a = toAddr(x, y)
+        value.intoByteBuffer(array, a, BO)
+    }
+
+    fun setScalar(x: Int, y: Int, value: Float) {
+        val a = toAddr(x, y)
+
+        array.putFloat(a + 0, value)
+        array.putFloat(a + 1, value)
+        array.putFloat(a + 2, value)
+        array.putFloat(a + 3, value)
+    }
+
+    fun max(x: Int, y: Int, other: FloatVector) {
+        val a = toAddr(x, y)
+        val mv = _getVec(a).max(other)
+        _setVec(a, mv)
+    }
+
+    fun mul(x: Int, y: Int, scalar: Float) {
+        val a = toAddr(x, y)
+        val mv = _getVec(a).max(scalar)
+        _setVec(a, mv)
+    }
+
+}