From 380d2cd2541ab9a6aa6d4ab952ec38b72520002c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bart=C5=82omiej=20Pluta?=
 <noreply.git@mx.bartlomiejpluta.com>
Date: Tue, 15 Jul 2025 23:33:54 +0200
Subject: [PATCH] Add BoundingBox interface to Camera

---
 .../base/api/camera/Camera.java               |  3 ++-
 .../base/internal/render/BoundingBox.java     | 27 +++++++++++++++++++
 .../engine/world/camera/DefaultCamera.java    | 23 +++++++++++++++-
 3 files changed, 51 insertions(+), 2 deletions(-)
 create mode 100644 api/src/main/java/com/bartlomiejpluta/base/internal/render/BoundingBox.java

diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/camera/Camera.java b/api/src/main/java/com/bartlomiejpluta/base/api/camera/Camera.java
index 5a2d8ddb..3e56afbe 100644
--- a/api/src/main/java/com/bartlomiejpluta/base/api/camera/Camera.java
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/camera/Camera.java
@@ -4,10 +4,11 @@ import com.bartlomiejpluta.base.api.context.Context;
 import com.bartlomiejpluta.base.api.move.Movable;
 import com.bartlomiejpluta.base.api.screen.Screen;
 import com.bartlomiejpluta.base.internal.object.Placeable;
+import com.bartlomiejpluta.base.internal.render.BoundingBox;
 import com.bartlomiejpluta.base.internal.render.ShaderManager;
 import org.joml.Matrix4fc;
 
-public interface Camera extends Placeable {
+public interface Camera extends Placeable, BoundingBox {
    Matrix4fc computeViewModelMatrix(Matrix4fc modelMatrix);
 
    boolean insideFrustum(float x, float y, float radius);
diff --git a/api/src/main/java/com/bartlomiejpluta/base/internal/render/BoundingBox.java b/api/src/main/java/com/bartlomiejpluta/base/internal/render/BoundingBox.java
new file mode 100644
index 00000000..f3b9a9a1
--- /dev/null
+++ b/api/src/main/java/com/bartlomiejpluta/base/internal/render/BoundingBox.java
@@ -0,0 +1,27 @@
+package com.bartlomiejpluta.base.internal.render;
+
+import javax.swing.*;
+
+public interface BoundingBox {
+   float getMinX();
+
+   float getMaxX();
+
+   float getMinY();
+
+   float getMaxY();
+
+   default boolean containsBox(float minX, float maxX, float minY, float maxY) {
+      return !(this.getMaxX() < minX ||
+            this.getMinX() > maxX ||
+            this.getMaxY() < minY ||
+            this.getMinY() > maxY);
+   }
+
+   default boolean containsBox(BoundingBox box) {
+      return !(this.getMaxX() < box.getMinX() ||
+            this.getMinX() > box.getMaxX() ||
+            this.getMaxY() < box.getMinY() ||
+            this.getMinY() > box.getMaxY());
+   }
+}
diff --git a/engine/src/main/java/com/bartlomiejpluta/base/engine/world/camera/DefaultCamera.java b/engine/src/main/java/com/bartlomiejpluta/base/engine/world/camera/DefaultCamera.java
index 9bcf4fae..61d96bf6 100644
--- a/engine/src/main/java/com/bartlomiejpluta/base/engine/world/camera/DefaultCamera.java
+++ b/engine/src/main/java/com/bartlomiejpluta/base/engine/world/camera/DefaultCamera.java
@@ -6,6 +6,7 @@ import com.bartlomiejpluta.base.api.screen.Screen;
 import com.bartlomiejpluta.base.engine.core.gl.shader.constant.UniformName;
 import com.bartlomiejpluta.base.engine.world.object.Model;
 import com.bartlomiejpluta.base.internal.render.ShaderManager;
+import lombok.Getter;
 import org.joml.FrustumIntersection;
 import org.joml.Matrix4f;
 import org.joml.Matrix4fc;
@@ -16,6 +17,18 @@ public class DefaultCamera extends Model implements Camera {
    private final Matrix4f projectionViewMatrix = new Matrix4f();
    private final FrustumIntersection frustum = new FrustumIntersection();
 
+   @Getter
+   private float minX = 0f;
+
+   @Getter
+   private float maxX = 0f;
+
+   @Getter
+   private float minY = 0f;
+
+   @Getter
+   private float maxY = 0f;
+
    @Override
    public Matrix4fc computeViewModelMatrix(Matrix4fc modelMatrix) {
       return new Matrix4f(viewMatrix).mul(modelMatrix);
@@ -35,10 +48,13 @@ public class DefaultCamera extends Model implements Camera {
 
    @Override
    public void render(Screen screen, ShaderManager shaderManager) {
+      var screenWidth = screen.getWidth();
+      var screenHeight = screen.getHeight();
+
       // Update matrices
       projectionMatrix
             .identity()
-            .setOrtho2D(0, screen.getWidth(), screen.getHeight(), 0);
+            .setOrtho2D(0, screenWidth, screenHeight, 0);
 
       viewMatrix
             .identity()
@@ -51,6 +67,11 @@ public class DefaultCamera extends Model implements Camera {
 
       frustum.set(projectionViewMatrix);
 
+      this.minX = position.x;
+      this.maxX = position.x + screenWidth / scaleX;
+      this.minY = position.y;
+      this.maxY = position.y + screenHeight / scaleY;
+
       shaderManager.setUniform(UniformName.UNI_PROJECTION_MATRIX, projectionMatrix);
    }
 }