Qt: Add per-shader postprocessing options

src/duckstation-qt/postprocessingshaderconfigwidget.h

@@ -0,0 +1,26 @@
+#pragma once
+#include "frontend-common/postprocessing_shader.h"
+#include <QtWidgets/QDialog>
+
+class PostProcessingShaderConfigWidget : public QDialog
+{
+  Q_OBJECT
+
+public:
+  PostProcessingShaderConfigWidget(QWidget* parent, FrontendCommon::PostProcessingShader* shader);
+  ~PostProcessingShaderConfigWidget();
+
+Q_SIGNALS:
+  void configChanged();
+  void resettingtoDefaults();
+
+private Q_SLOTS:
+  void onCloseClicked();
+  void onResetToDefaultsClicked();
+
+private:
+  void createUi();
+
+  FrontendCommon::PostProcessingShader* m_shader;
+};
+