glsl: Implement barriers

src/shader_recompiler/backend/glsl/emit_glsl_barriers.cpp

@@ -0,0 +1,21 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "shader_recompiler/backend/glsl/emit_context.h"
+#include "shader_recompiler/backend/glsl/emit_glsl_instructions.h"
+#include "shader_recompiler/frontend/ir/value.h"
+
+namespace Shader::Backend::GLSL {
+void EmitBarrier(EmitContext& ctx) {
+    ctx.Add("barrier();");
+}
+
+void EmitWorkgroupMemoryBarrier(EmitContext& ctx) {
+    ctx.Add("groupMemoryBarrier();");
+}
+
+void EmitDeviceMemoryBarrier(EmitContext& ctx) {
+    ctx.Add("memoryBarrier();");
+}
+} // namespace Shader::Backend::GLSL