only check 16bit float control if 16bit floats can be used

Author: devshgraphicsprogramming

src/nbl/video/CVulkanPhysicalDevice.cpp

@@ -401,8 +401,7 @@ std::unique_ptr<CVulkanPhysicalDevice> CVulkanPhysicalDevice::create(core::smart
         //vulkan12Properties.denormBehaviorIndependence;
         //vulkan12Properties.denormBehaviorIndependence;
 
-        if (!vulkan12Properties.shaderSignedZeroInfNanPreserveFloat16)
-            return nullptr;
+	//! preserve of 16bit float checked later when features are known
         if (!vulkan12Properties.shaderSignedZeroInfNanPreserveFloat32)
             return nullptr;
         properties.limits.shaderSignedZeroInfNanPreserveFloat64 = vulkan12Properties.shaderSignedZeroInfNanPreserveFloat64;
@@ -905,6 +904,13 @@ std::unique_ptr<CVulkanPhysicalDevice> CVulkanPhysicalDevice::create(core::smart
         properties.limits.shaderSharedInt64Atomics = vulkan12Features.shaderSharedInt64Atomics;
 
         properties.limits.shaderFloat16 = vulkan12Features.shaderFloat16;
+	if (!vulkan12Features.shaderFloat16)
+	{
+		// only fail if 16bit floats can be used
+		if (!vulkan12Properties.shaderSignedZeroInfNanPreserveFloat16)
+		    return nullptr;
+	}
+	    
         if (!vulkan12Features.shaderInt8)
             return nullptr;
 
@@ -1899,4 +1905,4 @@ core::smart_refctd_ptr<ILogicalDevice> CVulkanPhysicalDevice::createLogicalDevic
     return core::make_smart_refctd_ptr<CVulkanLogicalDevice>(core::smart_refctd_ptr<const IAPIConnection>(m_initData.api),m_rdoc_api,this,vk_device,params);
 }
 
-}
+}