From 0feaa484bf9c57b09af55fa22f85735f08894748 Mon Sep 17 00:00:00 2001
From: Johannes Kuhlmann <git@johanneskuhlmann.de>
Date: Tue, 24 Aug 2021 21:07:58 +0200
Subject: [PATCH] Change writer to only write the alpha cutoff when using mask
 alpha mode to silence validator (bug #152).

---
 cgltf_write.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cgltf_write.h b/cgltf_write.h
index 4305722..d7dfafd 100644
--- a/cgltf_write.h
+++ b/cgltf_write.h
@@ -534,7 +534,10 @@ static void cgltf_write_material(cgltf_write_context* context, const cgltf_mater
 {
 	cgltf_write_line(context, "{");
 	cgltf_write_strprop(context, "name", material->name);
-	cgltf_write_floatprop(context, "alphaCutoff", material->alpha_cutoff, 0.5f);
+	if (material->alpha_mode == cgltf_alpha_mode_mask)
+	{
+		cgltf_write_floatprop(context, "alphaCutoff", material->alpha_cutoff, 0.5f);
+	}
 	cgltf_write_boolprop_optional(context, "doubleSided", material->double_sided, false);
 	// cgltf_write_boolprop_optional(context, "unlit", material->unlit, false);