shader: Initial recompiler work

src/shader_recompiler/frontend/ir/condition.h

@@ -0,0 +1,60 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+#include <compare>
+
+#include <fmt/format.h>
+
+#include "common/common_types.h"
+#include "shader_recompiler/frontend/ir/flow_test.h"
+#include "shader_recompiler/frontend/ir/pred.h"
+
+namespace Shader::IR {
+
+class Condition {
+public:
+    Condition() noexcept = default;
+
+    explicit Condition(FlowTest flow_test_, Pred pred_, bool pred_negated_ = false) noexcept
+        : flow_test{static_cast<u16>(flow_test_)}, pred{static_cast<u8>(pred_)},
+          pred_negated{pred_negated_ ? u8{1} : u8{0}} {}
+
+    explicit Condition(Pred pred_, bool pred_negated_ = false) noexcept
+        : Condition(FlowTest::T, pred_, pred_negated_) {}
+
+    Condition(bool value) : Condition(Pred::PT, !value) {}
+
+    auto operator<=>(const Condition&) const noexcept = default;
+
+    [[nodiscard]] IR::FlowTest FlowTest() const noexcept {
+        return static_cast<IR::FlowTest>(flow_test);
+    }
+
+    [[nodiscard]] std::pair<IR::Pred, bool> Pred() const noexcept {
+        return {static_cast<IR::Pred>(pred), pred_negated != 0};
+    }
+
+private:
+    u16 flow_test;
+    u8 pred;
+    u8 pred_negated;
+};
+
+std::string NameOf(Condition condition);
+
+} // namespace Shader::IR
+
+template <>
+struct fmt::formatter<Shader::IR::Condition> {
+    constexpr auto parse(format_parse_context& ctx) {
+        return ctx.begin();
+    }
+    template <typename FormatContext>
+    auto format(const Shader::IR::Condition& cond, FormatContext& ctx) {
+        return fmt::format_to(ctx.out(), "{}", Shader::IR::NameOf(cond));
+    }
+};