toy with using structs for vertex buffers

Author: codex128

jme3-core/src/main/java/com/jme3/vulkan/mesh/test/Vertex.java

@@ -7,15 +7,43 @@
 
 public class Vertex extends Struct {
 
-    public final Vector3f position = new Vector3f();
-    public final Vector2f texCoord = new Vector2f();
-    public final Vector3f normal = new Vector3f();
+    private final Field<Vector3f> position = new Field<>(new Vector3f());
+    private final Field<Vector2f> texCoord = new Field<>(new Vector2f());
+    private final Field<Vector3f> normal = new Field<>(new Vector3f());
 
-    public Vertex(StructLayout layout) {
-        addFields(new Field(position), new Field(texCoord), new Field(normal));
-        setLayout(layout); // stage layout, not calculated immediately
+    public Vertex() {
+        addFields(position, texCoord, normal);
     }
 
+    public void bind(StructLayout layout, long address) {
+        for (Field f : fields) {
+            f.bind(layout, address);
+        }
+    }
+
+    public void setPosition(Vector3f position) {
+        updateLayout();
+        this.position.set(address, position);
+    }
+
+    public void setPosition(float x, float y, float z) {
+        position.set(position.getAlias().set(x, y, z));
+    }
+
+    public Vector3f getPosition() {
+        return position.get(address);
+    }
+
+    public void setTexCoord(Vector2f texCoord) {
+        this.texCoord.set(address, texCoord);
+    }
 
+    public void setTexCoord(float x, float y) {
+        texCoord.set(address, texCoord.getAlias().set(x, y));
+    }
+
+    public Vector2f getTexCoord() {
+        return texCoord.get(address);
+    }
 
 }

jme3-examples/src/main/java/jme3test/vulkan/TestJme4.java

@@ -7,6 +7,7 @@
 import com.jme3.math.ColorRGBA;
 import com.jme3.scene.Geometry;
 import com.jme3.scene.shape.Box;
+import com.jme3.util.struct.StructLayout;
 import com.jme3.vulkan.formats.Format;
 import com.jme3.vulkan.material.structs.UnshadedParams;
 import com.jme3.vulkan.mesh.InputRate;
@@ -38,6 +39,10 @@ public void simpleInitApp() {
             }));
         });
 
+        MeshLayout l2 = MeshLayout.build(m -> {
+            m.addBinding(new VertexBinding(engine, InputRate.Vertex, () -> new Vertex(StructLayout.std140)));
+        });
+
         Geometry g = new Geometry("geom_jme4", new Box(1f, 1f, 1f));
         Material m = engine.createMaterial("Common/MatDefs/Misc/Unshaded.j3md");
         UnshadedParams p = m.get("Parameters");