From dac1cc9b618b172266d73524efc1e35d925810f5 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 11 Jun 2026 14:41:53 +0000
Subject: [PATCH 1/2] Initial plan


From a0d2f25e944be3df0c6ea36aeef90fc655d12574 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 11 Jun 2026 14:46:29 +0000
Subject: [PATCH 2/2] Print warning when mipmap generation falls back to CPU
 generation

When the texture format does not support GPU-side mipmap generation
(not both colorRenderable and filterable) and the system successfully
falls back to CPU mipmap generation, log a WARNING to inform the
developer of the fallback and which format caused it.

Fixes: https://github.com/jMonkeyEngine/jmonkeyengine/issues/...
---
 .../src/main/java/com/jme3/renderer/opengl/GLRenderer.java    | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/jme3-core/src/main/java/com/jme3/renderer/opengl/GLRenderer.java b/jme3-core/src/main/java/com/jme3/renderer/opengl/GLRenderer.java
index d726a7280a..be54cb3092 100644
--- a/jme3-core/src/main/java/com/jme3/renderer/opengl/GLRenderer.java
+++ b/jme3-core/src/main/java/com/jme3/renderer/opengl/GLRenderer.java
@@ -2868,6 +2868,10 @@ private void updateTexImageData(Image img, Texture.Type type, int unit, boolean
                             cpuMipmapsGenerated = true;
                             scaleToPot = false;
                             img.setMipmapsGenerated(true);
+                            logger.log(Level.WARNING,
+                                    "Texture " + img + " requires mipmaps, but the format " + img.getFormat()
+                                            + " does not support hardware mipmap generation."
+                                            + " Falling back to CPU mipmap generation.");
                         }
                     } catch (RuntimeException exception) {
                         cpuMipmapFallbackFailed = true;