video_core: Abstract transform feedback translation utility

src/video_core/transform_feedback.h

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+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <vector>
+
+#include "common/common_types.h"
+#include "shader_recompiler/profile.h"
+#include "video_core/engines/maxwell_3d.h"
+
+namespace VideoCommon {
+
+struct TransformFeedbackState {
+    struct Layout {
+        u32 stream;
+        u32 varying_count;
+        u32 stride;
+    };
+    std::array<Layout, Tegra::Engines::Maxwell3D::Regs::NumTransformFeedbackBuffers> layouts;
+    std::array<std::array<u8, 128>, Tegra::Engines::Maxwell3D::Regs::NumTransformFeedbackBuffers>
+        varyings;
+};
+
+std::vector<Shader::TransformFeedbackVarying> MakeTransformFeedbackVaryings(
+    const TransformFeedbackState& state);
+
+} // namespace VideoCommon