SuperTuxKart 1.5 upstream source (from official release tarball)

lib/graphics_engine/include/ge_occlusion_culling.hpp

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+#ifndef HEADER_GE_OCCLUSION_CULLING_HPP
+#define HEADER_GE_OCCLUSION_CULLING_HPP
+
+#include <aabbox3d.h>
+#include <vector3d.h>
+
+#include <LinearMath/btVector3.h>
+
+#include <array>
+#include <vector>
+
+class btCollisionShape;
+class btCollisionObject;
+class btTriangleMesh;
+
+namespace GE
+{
+class GEOcclusionCulling
+{
+private:
+    btTriangleMesh* m_triangle_mesh;
+
+    btCollisionShape* m_occluder_shape;
+
+    btCollisionObject* m_occluder_object;
+
+    // Point generators that yield one point at a time
+    class PointGenerator
+    {
+    public:
+        virtual ~PointGenerator() {}
+        virtual bool getNextPoint(btVector3& point) = 0;
+    };
+
+    class SpherePointGenerator : public PointGenerator
+    {
+    private:
+        btVector3 m_center;
+        float m_radius;
+        int m_num_points;
+        int m_current_point;
+    public:
+        // --------------------------------------------------------------------
+        SpherePointGenerator(const btVector3& center, float radius,
+                             int num_points)
+        {
+            m_center = center;
+            m_radius = radius;
+            m_num_points = num_points;
+            m_current_point = 0;
+        }
+        // --------------------------------------------------------------------
+        bool getNextPoint(btVector3& point);
+    };
+
+public:
+    // ------------------------------------------------------------------------
+    GEOcclusionCulling();
+    // ------------------------------------------------------------------------
+    ~GEOcclusionCulling();
+    // ------------------------------------------------------------------------
+    void addOccluderMesh(const std::vector<std::array<btVector3, 3> >& tris);
+    // ------------------------------------------------------------------------
+    bool isOccluded(const irr::core::vector3df& cam_pos,
+                    const irr::core::aabbox3df& aabbox)
+    {
+        // Use sphere test for now, testing the aabbox against the frustum
+        // should be done first.
+        float radius = aabbox.getExtent().getLength() / 2.0f;
+        return isOccluded(cam_pos, aabbox.getCenter(), radius);
+    }
+    // ------------------------------------------------------------------------
+    bool isOccluded(const irr::core::vector3df& cam_pos,
+                    const irr::core::vector3df& irr_center, float radius);
+
+};
+
+}
+
+#endif