FrontendCommon: Add a post processing implementation

src/frontend-common/postprocessing_chain.h

@@ -0,0 +1,36 @@
+#pragma once
+#include "postprocessing_shader.h"
+#include <string_view>
+#include <vector>
+
+namespace FrontendCommon {
+
+class PostProcessingChain
+{
+public:
+  PostProcessingChain();
+  ~PostProcessingChain();
+
+  ALWAYS_INLINE bool IsEmpty() const { return m_shaders.empty(); }
+  ALWAYS_INLINE const u32 GetStageCount() const { return static_cast<u32>(m_shaders.size()); }
+  ALWAYS_INLINE const PostProcessingShader& GetShaderStage(u32 i) const { return m_shaders[i]; }
+  ALWAYS_INLINE PostProcessingShader& GetShaderStage(u32 i) { return m_shaders[i]; }
+
+  void AddShader(PostProcessingShader shader);
+  bool AddStage(const std::string_view& name);
+  void RemoveStage(u32 index);
+  void MoveStageUp(u32 index);
+  void MoveStageDown(u32 index);
+  void ClearStages();
+
+  std::string GetConfigString() const;
+
+  bool CreateFromString(const std::string_view& chain_config);
+
+  static std::vector<std::string> GetAvailableShaderNames();
+
+private:
+  std::vector<PostProcessingShader> m_shaders;
+};
+
+} // namespace FrontendCommon