From da401af52c2c82a5f0f85bad486f868f8807e745 Mon Sep 17 00:00:00 2001
From: Lynix <lynix680@gmail.com>
Date: Sun, 24 Apr 2016 04:37:31 +0200
Subject: [PATCH] Vulkan/VkLoader: Add
 EnumerateInstance[Extension|Layer]Properties helper

Former-commit-id: a7cfc73816266cef944f7cb3c668be0b86bbfcbf
---
 include/Nazara/Vulkan/VkLoader.hpp |  4 +++
 src/Nazara/Vulkan/VkLoader.cpp     | 53 ++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/include/Nazara/Vulkan/VkLoader.hpp b/include/Nazara/Vulkan/VkLoader.hpp
index c700451c5..f12429b28 100644
--- a/include/Nazara/Vulkan/VkLoader.hpp
+++ b/include/Nazara/Vulkan/VkLoader.hpp
@@ -22,6 +22,9 @@ namespace Nz
 				Loader() = delete;
 				~Loader() = delete;
 				
+				static bool EnumerateInstanceExtensionProperties(std::vector<VkExtensionProperties>* properties, const char* layerName = nullptr);
+				static bool EnumerateInstanceLayerProperties(std::vector<VkLayerProperties>* properties);
+
 				static inline PFN_vkVoidFunction GetInstanceProcAddr(VkInstance instance, const char* name);
 
 				static bool Initialize();
@@ -39,6 +42,7 @@ namespace Nz
 
 			private:
 				static DynLib s_vulkanLib;
+				static VkResult s_lastErrorCode;
 		};
 	}
 }
diff --git a/src/Nazara/Vulkan/VkLoader.cpp b/src/Nazara/Vulkan/VkLoader.cpp
index c4a6f08b5..c9d2a360d 100644
--- a/src/Nazara/Vulkan/VkLoader.cpp
+++ b/src/Nazara/Vulkan/VkLoader.cpp
@@ -9,6 +9,56 @@ namespace Nz
 {
 	namespace Vk
 	{
+		bool Loader::EnumerateInstanceExtensionProperties(std::vector<VkExtensionProperties>* properties, const char* layerName)
+		{
+			NazaraAssert(properties, "Invalid device vector");
+
+			// First, query physical device count
+			UInt32 propertyCount = 0; // Remember, Nz::UInt32 is a typedef on uint32_t
+			s_lastErrorCode = vkEnumerateInstanceExtensionProperties(layerName, &propertyCount, properties->data());
+			if (s_lastErrorCode != VkResult::VK_SUCCESS)
+			{
+				NazaraError("Failed to get instance extension properties count");
+				return false;
+			}
+
+			// Now we can get the list of the available physical device
+			properties->resize(propertyCount);
+			s_lastErrorCode = vkEnumerateInstanceExtensionProperties(layerName, &propertyCount, properties->data());
+			if (s_lastErrorCode != VkResult::VK_SUCCESS)
+			{
+				NazaraError("Failed to enumerate instance extension properties");
+				return false;
+			}
+
+			return true;
+		}
+
+		bool Loader::EnumerateInstanceLayerProperties(std::vector<VkLayerProperties>* properties)
+		{
+			NazaraAssert(properties, "Invalid device vector");
+
+			// First, query physical device count
+			UInt32 propertyCount = 0; // Remember, Nz::UInt32 is a typedef on uint32_t
+			s_lastErrorCode = vkEnumerateInstanceLayerProperties(&propertyCount, properties->data());
+			if (s_lastErrorCode != VkResult::VK_SUCCESS)
+			{
+				NazaraError("Failed to get instance layer properties count");
+				return false;
+			}
+
+			// Now we can get the list of the available physical device
+			properties->resize(propertyCount);
+			s_lastErrorCode = vkEnumerateInstanceLayerProperties(&propertyCount, properties->data());
+			if (s_lastErrorCode != VkResult::VK_SUCCESS)
+			{
+				NazaraError("Failed to enumerate instance layer properties");
+				return false;
+			}
+
+			return true;
+		}
+
 		bool Loader::Initialize()
 		{
 			#ifdef NAZARA_PLATFORM_WINDOWS
@@ -42,6 +92,8 @@ namespace Nz
 
 			#undef NAZARA_VULKAN_LOAD_GLOBAL
 
+			s_lastErrorCode = VkResult::VK_SUCCESS;
+
 			return true;
 		}
 
@@ -55,6 +107,7 @@ namespace Nz
 		#undef NAZARA_VULKAN_GLOBAL_FUNCTION_IMPL
 
 		DynLib Loader::s_vulkanLib;
+		VkResult Loader::s_lastErrorCode;
 
 		void Loader::Uninitialize()
 		{