alpha-blend translucent block and entity texels (stained glass, slime skin, text backgrounds)

tools/ObjectTestRender.java

@@ -82,9 +82,10 @@ public class ObjectTestRender {
         objs.add(obj(ObjectState.Kind.TEXT,
             Affine.translation(1.5, 3.0, 0).mul(Affine.rotY(Math.PI)).mul(Affine.scale(0.025)), null, null,
             List.of("Hallo PixelPics!", "Zeile zwei äöü"), 0xFF203040));
-        // Text seen from the BACK (front faces +Z, camera is on -Z) and a shield item.
+        // Text seen from the BACK (front faces +Z, camera is on -Z) on the vanilla default 25% black
+        // background (blended), and a shield item.
         objs.add(obj(ObjectState.Kind.TEXT, Affine.translation(-0.5, 3.0, 0).mul(Affine.scale(0.025)), null, null,
-            List.of("Rueckseite"), 0));
+            List.of("Rueckseite"), 0x40000000));
         objs.add(obj(ObjectState.Kind.ITEM, Affine.translation(4, 1.0, 0.5), null, "shield", List.of(), 0));
         // Dropped item (flat) on the ground.
         objs.add(obj(ObjectState.Kind.ITEM, Affine.translation(-1, 0.3, 0.5).mul(Affine.scale(0.5)), null, "apple", List.of(), 0));