maxwell_to_vk: Add R16_SNORM

src/video_core/renderer_vulkan/maxwell_to_vk.cpp

@@ -157,7 +157,7 @@ struct FormatTuple {
     {VK_FORMAT_R32_SFLOAT, Attachable | Storage},              // R32_FLOAT
     {VK_FORMAT_R16_SFLOAT, Attachable | Storage},              // R16_FLOAT
     {VK_FORMAT_R16_UNORM, Attachable | Storage},               // R16_UNORM
-    {VK_FORMAT_UNDEFINED},                                     // R16_SNORM
+    {VK_FORMAT_R16_SNORM, Attachable | Storage},               // R16_SNORM
     {VK_FORMAT_R16_UINT, Attachable | Storage},                // R16_UINT
     {VK_FORMAT_UNDEFINED},                                     // R16_SINT
     {VK_FORMAT_R16G16_UNORM, Attachable | Storage},            // R16G16_UNORM

src/video_core/vulkan_common/vulkan_device.cpp

@@ -116,6 +116,7 @@ std::unordered_map<VkFormat, VkFormatProperties> GetFormatProperties(vk::Physica
         VK_FORMAT_R16G16_SFLOAT,
         VK_FORMAT_R16G16_SINT,
         VK_FORMAT_R16_UNORM,
+        VK_FORMAT_R16_SNORM,
         VK_FORMAT_R16_UINT,
         VK_FORMAT_R8G8B8A8_SRGB,
         VK_FORMAT_R8G8_UNORM,