From 4ebd6368fbcdf3bb7b4066674dde0b9d9dc705fc Mon Sep 17 00:00:00 2001
From: Syoyo Fujita <syoyo@lighttransport.com>
Date: Thu, 15 Aug 2019 12:25:50 +0900
Subject: [PATCH] Fix inequality of texture index check when serializing
 texture of material. Texture info was written even if it have invalid
 index(-1). Fixes #189

---
 tiny_gltf.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tiny_gltf.h b/tiny_gltf.h
index b18aed9..36226c1 100644
--- a/tiny_gltf.h
+++ b/tiny_gltf.h
@@ -5382,13 +5382,13 @@ static void SerializeGltfPbrMetallicRoughness(PbrMetallicRoughness &pbr,
     SerializeNumberProperty("roughnessFactor", pbr.roughnessFactor, o);
   }
 
-  if (pbr.baseColorTexture.index >= -1) {
+  if (pbr.baseColorTexture.index > -1) {
     json texinfo;
     SerializeGltfTextureInfo(pbr.baseColorTexture, texinfo);
     o["baseColorTexture"] = texinfo;
   }
 
-  if (pbr.metallicRoughnessTexture.index >= -1) {
+  if (pbr.metallicRoughnessTexture.index > -1) {
     json texinfo;
     SerializeGltfTextureInfo(pbr.metallicRoughnessTexture, texinfo);
     o["metallicRoughnessTexture"] = texinfo;
@@ -5418,19 +5418,19 @@ static void SerializeGltfMaterial(Material &material, json &o) {
 
   o["doubleSided"] = json(material.doubleSided);
 
-  if (material.normalTexture.index >= -1) {
+  if (material.normalTexture.index > -1) {
     json texinfo;
     SerializeGltfNormalTextureInfo(material.normalTexture, texinfo);
     o["normalTexture"] = texinfo;
   }
 
-  if (material.occlusionTexture.index >= -1) {
+  if (material.occlusionTexture.index > -1) {
     json texinfo;
     SerializeGltfOcclusionTextureInfo(material.occlusionTexture, texinfo);
     o["occlusionTexture"] = texinfo;
   }
 
-  if (material.emissiveTexture.index >= -1) {
+  if (material.emissiveTexture.index > -1) {
     json texinfo;
     SerializeGltfTextureInfo(material.emissiveTexture, texinfo);
     o["emissiveTexture"] = texinfo;