From 8e432aee8d643493b347a37141497b51da5388db Mon Sep 17 00:00:00 2001
From: Richard Davey <rich@photonstorm.com>
Date: Fri, 11 Oct 2024 00:08:00 +0100
Subject: [PATCH] `BaseCamera.renderRoundPixels` is a new read-only property
 that is set during the Camera `preRender` method every frame. It is true if
 the Camera is set to render round pixels and the zoom values are integers,
 otherwise it is false. This is then fed into the MultiPipeline when rendering
 sprites and textures.

---
 src/cameras/2d/BaseCamera.js | 16 ++++++++++++++++
 src/cameras/2d/Camera.js     |  5 ++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/cameras/2d/BaseCamera.js b/src/cameras/2d/BaseCamera.js
index d0bbf1ecbb..5158720480 100644
--- a/src/cameras/2d/BaseCamera.js
+++ b/src/cameras/2d/BaseCamera.js
@@ -517,6 +517,22 @@ var BaseCamera = new Class({
          * @since 3.60.0
          */
         this.isSceneCamera = true;
+
+        /**
+         * Can this Camera render rounded pixel values?
+         * 
+         * This property is updated during the `preRender` method and should not be
+         * set directly. It is set based on the `roundPixels` property of the Camera
+         * combined with the zoom level. If the zoom is an integer then the WebGL
+         * Renderer can apply rounding during rendering.
+         *
+         * @name Phaser.Cameras.Scene2D.BaseCamera#renderRoundPixels
+         * @type {boolean}
+         * @readonly
+         * @default true
+         * @since 3.86.0
+         */
+        this.renderRoundPixels = true;
     },
 
     /**
diff --git a/src/cameras/2d/Camera.js b/src/cameras/2d/Camera.js
index af31f577e8..bbd38e2e7f 100644
--- a/src/cameras/2d/Camera.js
+++ b/src/cameras/2d/Camera.js
@@ -501,6 +501,8 @@ var Camera = new Class({
         var zoomY = this.zoomY;
         var matrix = this.matrix;
 
+        this.renderRoundPixels = (this.roundPixels && Number.isInteger(zoomX) && Number.isInteger(zoomY));
+
         var originX = width * this.originX;
         var originY = height * this.originY;
 
@@ -589,7 +591,8 @@ var Camera = new Class({
             Math.floor(this.x + originX + 0.5),
             Math.floor(this.y + originY + 0.5),
             this.rotation,
-            zoomX, zoomY);
+            zoomX, zoomY
+        );
 
         matrix.translate(-originX, -originY);