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2022-10-20 20:29:11 +08:00
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+// SPDX-License-Identifier: LGPL-2.1-only
+// Copyright (C) 2022 James Hogan <james@albanarts.com>
+
+#ifndef OSGXR_COMPOSITION_LAYER
+#define OSGXR_COMPOSITION_LAYER 1
+
+#include <osgXR/CompositionLayer>
+
+#include "OpenXR/Compositor.h"
+#include "OpenXR/Session.h"
+
+#include <osg/observer_ptr>
+
+namespace osgXR {
+
+class XRState;
+
+class CompositionLayer::Private
+{
+    public:
+
+        static Private *get(CompositionLayer *pub)
+        {
+            return pub->_private.get();
+        }
+
+        static const Private *get(const CompositionLayer *pub)
+        {
+            return pub->_private.get();
+        }
+
+        Private(XRState *state);
+        virtual ~Private();
+
+        void setVisible(bool visible);
+        bool getVisible() const;
+
+        void setOrder(int order);
+        int getOrder() const;
+
+        void setAlphaMode(AlphaMode mode);
+        AlphaMode getAlphaMode() const;
+
+        /// Write to composition layer
+        bool writeCompositionLayer(OpenXR::Session *session,
+                                   OpenXR::CompositionLayer *layer,
+                                   bool disableAlpha) const;
+
+        /// Setup composition layer with an OpenXR session
+        virtual bool setup(OpenXR::Session *session) = 0;
+
+        /// Add composition layers to the frame
+        virtual void endFrame(OpenXR::Session::Frame *frame) = 0;
+
+        /// Clean up composition layer before an OpenXR session is destroyed
+        virtual void cleanupSession() = 0;
+
+        /// For sorting operations
+        static bool compareOrder(Private *a, Private *b)
+        {
+            return a->_order < b->_order;
+        }
+
+    protected:
+
+        osg::observer_ptr<XRState> _state;
+
+        bool _visible;
+        int _order;
+        AlphaMode _alphaMode;
+};
+
+} // osgXR
+
+#endif