glsl: Initial backend

src/shader_recompiler/backend/glsl/emit_context.h

@@ -0,0 +1,62 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+#include <utility>
+#include <fmt/format.h>
+
+#include "shader_recompiler/backend/glsl/reg_alloc.h"
+#include "shader_recompiler/stage.h"
+
+namespace Shader {
+struct Info;
+struct Profile;
+} // namespace Shader
+
+namespace Shader::Backend {
+struct Bindings;
+}
+
+namespace Shader::IR {
+class Inst;
+struct Program;
+} // namespace Shader::IR
+
+namespace Shader::Backend::GLSL {
+
+class EmitContext {
+public:
+    explicit EmitContext(IR::Program& program, Bindings& bindings, const Profile& profile_);
+
+    template <typename... Args>
+    void Add(const char* format_str, IR::Inst& inst, Args&&... args) {
+        code += fmt::format(format_str, reg_alloc.Define(inst), std::forward<Args>(args)...);
+        // TODO: Remove this
+        code += '\n';
+    }
+
+    template <typename... Args>
+    void Add(const char* format_str, Args&&... args) {
+        code += fmt::format(format_str, std::forward<Args>(args)...);
+        // TODO: Remove this
+        code += '\n';
+    }
+
+    std::string AllocVar() {
+        return fmt::format("var_{}", var_num++);
+    }
+
+    std::string code;
+    RegAlloc reg_alloc;
+    const Info& info;
+    const Profile& profile;
+    u64 var_num{};
+
+private:
+    void DefineConstantBuffers();
+};
+
+} // namespace Shader::Backend::GLSL