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Thirdparty/Pangolin/include/pangolin/scene/renderable.h

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+/* This file is part of the Pangolin Project.
+ * http://github.com/stevenlovegrove/Pangolin
+ *
+ * Copyright (c) 2011 Steven Lovegrove
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+#include <memory>
+#include <map>
+#include <random>
+
+#include <pangolin/display/opengl_render_state.h>
+#include <pangolin/scene/interactive.h>
+
+namespace pangolin {
+
+class Renderable
+{
+public:
+    using guid_t = GLuint;
+
+    static guid_t UniqueGuid()
+    {
+        static std::random_device rd;
+        static std::mt19937 gen(rd());
+        return (guid_t)gen();
+    }
+
+    Renderable(const std::weak_ptr<Renderable>& parent = std::weak_ptr<Renderable>())
+        : guid(UniqueGuid()), parent(parent), T_pc(IdentityMatrix()), should_show(true)
+    {
+    }
+
+    virtual ~Renderable()
+    {
+    }
+
+    // Default implementation simply renders children.
+    virtual void Render(const RenderParams& params = RenderParams()) {
+        RenderChildren(params);
+    }
+
+    void RenderChildren(const RenderParams& params)
+    {
+        for(auto& p : children) {
+            Renderable& r = *p.second;
+            if(r.should_show) {
+                glPushMatrix();
+                r.T_pc.Multiply();
+                r.Render(params);
+                if(r.manipulator) {
+                    r.manipulator->Render(params);
+                }
+                glPopMatrix();
+            }
+        }
+    }
+
+    std::shared_ptr<Renderable> FindChild(guid_t guid)
+    {
+        auto o = children.find(guid);
+        if(o != children.end()) {
+            return o->second;
+        }
+
+        for(auto& kv : children ) {
+            std::shared_ptr<Renderable> c = kv.second->FindChild(guid);
+            if(c) return c;
+        }
+
+        return std::shared_ptr<Renderable>();
+    }
+
+    Renderable& Add(const std::shared_ptr<Renderable>& child)
+    {
+        if(child) {
+            children[child->guid] = child;
+        };
+        return *this;
+    }
+
+    // Renderable properties
+    const guid_t guid;
+    std::weak_ptr<Renderable> parent;
+    pangolin::OpenGlMatrix T_pc;
+    bool should_show;
+
+    // Children
+    std::map<guid_t, std::shared_ptr<Renderable>> children;
+
+    // Manipulator (handler, thing)
+    std::shared_ptr<Manipulator> manipulator;
+};
+
+}