Improve NX Vulkan support.

This change was developed using publicly available information found in Vulkan headers and official documentation. No proprietary NX resources were used.

src/renderer_vk.cpp

@@ -1172,6 +1172,7 @@ VK_IMPORT_DEVICE
 
 			setGraphicsDebuggerPresent(NULL != m_renderDocDll);
 
+#if defined(VK_NO_PROTOTYPES)
 			m_vulkan1Dll = bx::dlopen(
 #if BX_PLATFORM_WINDOWS
 				"vulkan-1.dll"
@@ -1203,6 +1204,21 @@ VK_IMPORT
 
 #undef VK_IMPORT_FUNC
 
+#else // VK_NO_PROTOTYPES
+
+ 			vkGetInstanceProcAddr = ::vkGetInstanceProcAddr;
+			vkGetDeviceProcAddr = ::vkGetDeviceProcAddr;
+#define VK_IMPORT_FUNC(_optional, _func)                      \
+	if (NULL == _func) {                                        \
+	  _func = (PFN_##_func)vkGetInstanceProcAddr(NULL, #_func); \
+	  BX_TRACE("\t%p " #_func, _func);                          \
+	  imported &= _optional || NULL != _func;                   \
+	} while(0)
+
+VK_IMPORT
+#undef VK_IMPORT_FUNC
+#endif // VK_NO_PROTOTYPES
+
 			if (!imported)
 			{
 				BX_TRACE("Init error: Failed to load shared library functions.");
@@ -7022,6 +7038,16 @@ VK_DESTROY
 				result = vkCreateMacOSSurfaceMVK(instance, &sci, allocatorCb, &m_surface);
 			}
 		}
+#elif BX_PLATFORM_NX
+		if (NULL != vkCreateViSurfaceNN)
+		{
+			VkViSurfaceCreateInfoNN sci;
+			sci.sType  = VK_STRUCTURE_TYPE_VI_SURFACE_CREATE_INFO_NN;
+			sci.pNext  = NULL;
+			sci.flags  = 0;
+			sci.window = m_nwh;
+			result = vkCreateViSurfaceNN(instance, &sci, allocatorCb, &m_surface);
+		}
 #else
 #	error "Figure out KHR surface..."
 #endif // BX_PLATFORM_

src/renderer_vk.h

@@ -31,13 +31,19 @@
 #	define VK_USE_PLATFORM_MACOS_MVK
 #	define KHR_SURFACE_EXTENSION_NAME  VK_MVK_MACOS_SURFACE_EXTENSION_NAME
 #	define VK_IMPORT_INSTANCE_PLATFORM VK_IMPORT_INSTANCE_MACOS
+#elif BX_PLATFORM_NX
+# define VK_USE_PLATFORM_VI_NN
+#	define KHR_SURFACE_EXTENSION_NAME  VK_NN_VI_SURFACE_EXTENSION_NAME
+#	define VK_IMPORT_INSTANCE_PLATFORM VK_IMPORT_INSTANCE_NX
 #else
 #	define KHR_SURFACE_EXTENSION_NAME ""
 #	define VK_IMPORT_INSTANCE_PLATFORM
 #endif // BX_PLATFORM_*
 
 #define VK_NO_STDINT_H
+#if !BX_PLATFORM_NX
 #define VK_NO_PROTOTYPES
+#endif
 #include <vulkan-local/vulkan.h>
 #include <vulkan-local/vulkan_beta.h>
 
@@ -102,6 +108,10 @@
 			/* VK_MVK_macos_surface */                               \
 			VK_IMPORT_INSTANCE_FUNC(true,  vkCreateMacOSSurfaceMVK); \
 
+#define VK_IMPORT_INSTANCE_NX \
+			/* VK_NN_vi_surface */                              \
+			VK_IMPORT_INSTANCE_FUNC(true, vkCreateViSurfaceNN); \
+
 #define VK_IMPORT_INSTANCE                                                             \
 			VK_IMPORT_INSTANCE_FUNC(false, vkDestroyInstance);                         \
 			VK_IMPORT_INSTANCE_FUNC(false, vkEnumeratePhysicalDevices);                \