ShaderGen: Implement pixel ubershaders

Source/Core/VideoCommon/UberShaderPixel.h

@@ -0,0 +1,31 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <functional>
+#include "VideoCommon/PixelShaderGen.h"
+
+namespace UberShader
+{
+#pragma pack(1)
+struct pixel_ubershader_uid_data
+{
+  u32 num_texgens : 4;
+  u32 early_depth : 1;
+  u32 per_pixel_depth : 1;
+
+  u32 NumValues() const { return sizeof(pixel_ubershader_uid_data); }
+};
+#pragma pack()
+
+typedef ShaderUid<pixel_ubershader_uid_data> PixelShaderUid;
+
+PixelShaderUid GetPixelShaderUid();
+
+ShaderCode GenPixelShader(APIType ApiType, const ShaderHostConfig& host_config,
+                          const pixel_ubershader_uid_data* uid_data);
+
+void EnumeratePixelShaderUids(const std::function<void(const PixelShaderUid&)>& callback);
+}