Updated cgltf.

3rdparty/cgltf/cgltf_write.h

@@ -75,7 +75,8 @@ cgltf_size cgltf_write(const cgltf_options* options, char* buffer, cgltf_size si
 #define CGLTF_EXTENSION_FLAG_LIGHTS_PUNCTUAL        (1 << 3)
 #define CGLTF_EXTENSION_FLAG_DRACO_MESH_COMPRESSION (1 << 4)
 #define CGLTF_EXTENSION_FLAG_MATERIALS_CLEARCOAT    (1 << 5)
-#define CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION (1 << 6)
+#define CGLTF_EXTENSION_FLAG_MATERIALS_IOR          (1 << 6)
+#define CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION (1 << 7)
 
 typedef struct {
 	char* buffer;
@@ -508,6 +509,11 @@ static void cgltf_write_material(cgltf_write_context* context, const cgltf_mater
 		context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION;
 	}
 
+	if (material->has_ior)
+	{
+		context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_IOR;
+	}
+
 	if (material->has_pbr_metallic_roughness)
 	{
 		const cgltf_pbr_metallic_roughness* params = &material->pbr_metallic_roughness;
@@ -524,7 +530,7 @@ static void cgltf_write_material(cgltf_write_context* context, const cgltf_mater
 		cgltf_write_line(context, "}");
 	}
 
-	if (material->unlit || material->has_pbr_specular_glossiness || material->has_clearcoat || material->has_transmission)
+	if (material->unlit || material->has_pbr_specular_glossiness || material->has_clearcoat || material->has_ior || material->has_transmission)
 	{
 		cgltf_write_line(context, "\"extensions\": {");
 		if (material->has_clearcoat)
@@ -538,6 +544,13 @@ static void cgltf_write_material(cgltf_write_context* context, const cgltf_mater
 			cgltf_write_floatprop(context, "clearcoatRoughnessFactor", params->clearcoat_roughness_factor, 0.0f);
 			cgltf_write_line(context, "}");
 		}
+		if (material->has_ior)
+		{
+			const cgltf_ior* params = &material->ior;
+			cgltf_write_line(context, "\"KHR_materials_ior\": {");
+			cgltf_write_floatprop(context, "ior", params->ior, 1.5f);
+			cgltf_write_line(context, "}");
+		}
 		if (material->has_transmission)
 		{
 			const cgltf_transmission* params = &material->transmission;
@@ -914,6 +927,9 @@ static void cgltf_write_extensions(cgltf_write_context* context, uint32_t extens
 	if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_CLEARCOAT) {
 		cgltf_write_stritem(context, "KHR_materials_clearcoat");
 	}
+	if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_IOR) {
+		cgltf_write_stritem(context, "KHR_materials_ior");
+	}
 	if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION) {
 		cgltf_write_stritem(context, "KHR_materials_transmission");
 	}