Method parse_khr_lights_punctual

framework/gltf_loader.cpp:1566–1672

}

std::vector<std::unique_ptr<sg::Light>> GLTFLoader::parse_khr_lights_punctual()
{
	if (is_extension_enabled(KHR_LIGHTS_PUNCTUAL_EXTENSION))
	{
		if (model.extensions.find(KHR_LIGHTS_PUNCTUAL_EXTENSION) == model.extensions.end() || !model.extensions.at(KHR_LIGHTS_PUNCTUAL_EXTENSION).Has("lights"))
		{
			return {};
		}
		auto &khr_lights = model.extensions.at(KHR_LIGHTS_PUNCTUAL_EXTENSION).Get("lights");

		std::vector<std::unique_ptr<sg::Light>> light_components(khr_lights.ArrayLen());

		for (size_t light_index = 0; light_index < khr_lights.ArrayLen(); ++light_index)
		{
			auto &khr_light = khr_lights.Get(static_cast<int>(light_index));

			// Spec states a light has to have a type to be valid
			if (!khr_light.Has("type"))
			{
				LOGE("KHR_lights_punctual extension: light {} doesn't have a type!", light_index);
				throw std::runtime_error("Couldn't load glTF file, KHR_lights_punctual extension is invalid");
			}

			auto light = std::make_unique<sg::Light>(khr_light.Get("name").Get<std::string>());

			sg::LightType       type;
			sg::LightProperties properties;

			// Get type
			auto &gltf_light_type = khr_light.Get("type").Get<std::string>();
			if (gltf_light_type == "point")
			{
				type = sg::LightType::Point;
			}
			else if (gltf_light_type == "spot")
			{
				type = sg::LightType::Spot;
			}
			else if (gltf_light_type == "directional")
			{
				type = sg::LightType::Directional;
			}
			else
			{
				LOGE("KHR_lights_punctual extension: light type '{}' is invalid", gltf_light_type);
				throw std::runtime_error("Couldn't load glTF file, KHR_lights_punctual extension is invalid");
			}

			// Get properties
			if (khr_light.Has("color"))
			{
				properties.color = glm::vec3(
				    static_cast<float>(khr_light.Get("color").Get(0).Get<double>()),
				    static_cast<float>(khr_light.Get("color").Get(1).Get<double>()),
				    static_cast<float>(khr_light.Get("color").Get(2).Get<double>()));
			}

			if (khr_light.Has("intensity"))