Added support for anisotropyDirection

cgltf.h

@@ -508,6 +508,7 @@ typedef struct cgltf_iridescence
 typedef struct cgltf_anisotropy
 {
 	cgltf_float anisotropy_factor;
+	cgltf_float anisotropy_direction[2];
 	cgltf_texture_view anisotropy_texture;
 } cgltf_anisotropy;
 
@@ -4043,6 +4044,7 @@ static int cgltf_parse_json_anisotropy(cgltf_options* options, jsmntok_t const*
 
 	// Default
 	out_anisotropy->anisotropy_factor = 0.f;
+	cgltf_fill_float_array(out_anisotropy->anisotropy_direction, 2, 1.0f);
 
 	for (int j = 0; j < size; ++j)
 	{
@@ -4051,10 +4053,13 @@ static int cgltf_parse_json_anisotropy(cgltf_options* options, jsmntok_t const*
 		if (cgltf_json_strcmp(tokens + i, json_chunk, "anisotropyFactor") == 0)
 		{
 			++i;
-			out_anisotropy->anisotropy_factor = 0.f;
 			out_anisotropy->anisotropy_factor = cgltf_json_to_float(tokens + i, json_chunk);
 			++i;
 		}
+		else if (cgltf_json_strcmp(tokens + i, json_chunk, "anisotropyDirection") == 0)
+		{
+			i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_anisotropy->anisotropy_direction, 2);
+		}
 		else if (cgltf_json_strcmp(tokens + i, json_chunk, "anisotropyTexture") == 0)
 		{
 			i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_anisotropy->anisotropy_texture);

cgltf_write.h

@@ -739,6 +739,10 @@ static void cgltf_write_material(cgltf_write_context* context, const cgltf_mater
 			cgltf_write_line(context, "\"KHR_materials_anisotropy\": {");
 			const cgltf_anisotropy* params = &material->anisotropy;
 			cgltf_write_floatprop(context, "anisotropyFactor", params->anisotropy_factor, 0.f);
+			if (!params->anisotropy_texture->texture)
+			{
+				cgltf_write_floatarrayprop(context, "anisotropyDirection", params->anisotropy_direction, 2);
+			}
 			CGLTF_WRITE_TEXTURE_INFO("anisotropyTexture", params->anisotropy_texture);
 			cgltf_write_line(context, "}");
 		}