video_core: Fix SNORM texture buffer emulating error (#9001)

src/shader_recompiler/shader_info.h

@@ -29,6 +29,16 @@ enum class TextureType : u32 {
 };
 constexpr u32 NUM_TEXTURE_TYPES = 9;
 
+enum class TexturePixelFormat : u32 {
+    A8B8G8R8_SNORM,
+    R8_SNORM,
+    R8G8_SNORM,
+    R16G16B16A16_SNORM,
+    R16G16_SNORM,
+    R16_SNORM,
+    OTHER
+};
+
 enum class ImageFormat : u32 {
     Typeless,
     R8_UINT,