implement camera/position quantization

core/src/main/java/wtf/beatrice/retrorender/engine/FpsCameraController.java

@@ -17,12 +17,22 @@ public class FpsCameraController {
     private float yaw = 0f;
     private float pitch = 0f;
 
-    private float eyeHeight = 1.8f;
+    private final float eyeHeight = 1.8f;
+    private final float jumpSpeed = 12f;
+    private final float gravity = -50f;
     private float velocityY = 0f;
-    private float gravity = -50f;
-    private float jumpSpeed = 12f;
     private boolean grounded = false;
 
+    // --- approximation toggles
+    private final boolean retroQuantization = true;
+
+    // how coarse the rotation is (0.25f = round to 0.25°)
+    private final float yawStepDegrees   = 0.2f;
+    private final float pitchStepDegrees = 0.2f;
+
+    // how coarse the position is (16f = steps of 1/16 units)
+    private final float positionQuantize = 64f;
+
     private final Vector3 tmpForward = new Vector3();
     private final Vector3 tmpRight = new Vector3();
 
@@ -205,12 +215,29 @@ public class FpsCameraController {
             velocityY = jumpSpeed;
             grounded = false;
         }
+
+        // snap position to quantization steps
+        if (retroQuantization) {
+            float q = positionQuantize;
+            camera.position.x = Math.round(camera.position.x * q) / q;
+            camera.position.y = Math.round(camera.position.y * q) / q;
+            camera.position.z = Math.round(camera.position.z * q) / q;
+        }
     }
 
     private void updateCameraDirection() {
         // build direction vector from yaw/pitch
-        float yawRad = (float) Math.toRadians(yaw);
+        float useYaw   = yaw;
-        float pitchRad = (float) Math.toRadians(pitch);
+        float usePitch = pitch;
+
+        if (retroQuantization) {
+            // snap yaw/pitch to fixed angular steps
+            useYaw   = Math.round(useYaw / yawStepDegrees) * yawStepDegrees;
+            usePitch = Math.round(usePitch / pitchStepDegrees) * pitchStepDegrees;
+        }
+
+        float yawRad   = (float) Math.toRadians(useYaw);
+        float pitchRad = (float) Math.toRadians(usePitch);
 
         float x = (float) (Math.cos(pitchRad) * Math.sin(yawRad));
         float y = (float) Math.sin(pitchRad);