From 4e069c768d68ecf8c3b3427fed332ba29341f70f Mon Sep 17 00:00:00 2001
From: Matthew Petroff <matthew@mpetroff.net>
Date: Fri, 16 Jul 2021 10:03:01 -0400
Subject: [PATCH] Fix regression with non-power-of-two equirectangular images.

This regression was introduced in 9788fc6512fe0de950cb10678dc4d4f453ad376e.
---
 src/js/libpannellum.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/js/libpannellum.js b/src/js/libpannellum.js
index 2d99354..60c54b0 100644
--- a/src/js/libpannellum.js
+++ b/src/js/libpannellum.js
@@ -483,8 +483,9 @@ function Renderer(container) {
             }
 
             // Set parameters for rendering any size
-            if (imageType != "cubemap" && image.width <= maxWidth && haov == 2 * Math.PI)
-                gl.texParameteri(glBindType, gl.TEXTURE_WRAP_S, gl.REPEAT);
+            if (imageType != "cubemap" && image.width <= maxWidth &&
+                haov == 2 * Math.PI && (image.width & (image.width - 1)) == 0)
+                gl.texParameteri(glBindType, gl.TEXTURE_WRAP_S, gl.REPEAT); // Only supported for power-of-two images in WebGL 1
             else
                 gl.texParameteri(glBindType, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
             gl.texParameteri(glBindType, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);