VideoCommon: add common spirv helper functions

Co-authored-by: tellowkrinkle <tellowkrinkle@gmail.com>

Source/Core/VideoCommon/Spirv.h

@@ -0,0 +1,30 @@
+// Copyright 2022 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <cstddef>
+#include <optional>
+#include <string_view>
+#include <vector>
+
+#include "Common/CommonTypes.h"
+
+namespace SPIRV
+{
+// SPIR-V compiled code type
+using CodeType = u32;
+using CodeVector = std::vector<CodeType>;
+
+// Compile a vertex shader to SPIR-V.
+std::optional<CodeVector> CompileVertexShader(std::string_view source_code);
+
+// Compile a geometry shader to SPIR-V.
+std::optional<CodeVector> CompileGeometryShader(std::string_view source_code);
+
+// Compile a fragment shader to SPIR-V.
+std::optional<CodeVector> CompileFragmentShader(std::string_view source_code);
+
+// Compile a compute shader to SPIR-V.
+std::optional<CodeVector> CompileComputeShader(std::string_view source_code);
+}  // namespace SPIRV