pickable.h

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/*
 * Copyright (c) 2010, Willow Garage, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Willow Garage, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 */

#ifndef RVE_RENDER_SERVER_PICKABLE_H
#define RVE_RENDER_SERVER_PICKABLE_H

#include <rve_common/uuid.h>

namespace rve_render_server
{

struct Picked
{
  Picked()
  : object_extra(0)
  {}

  Picked(const rve_common::UUID& id, uint32_t extra)
  : object_id(id)
  , object_extra(extra)
  {}

  bool isNull() const { return object_id == rve_common::UUID::Null; }

  rve_common::UUID object_id;
  uint32_t object_extra;
};

struct PickRenderValues
{
  PickRenderValues()
  : id(0)
  , extra(0)
  {}

  PickRenderValues(uint32_t id, uint32_t extra)
  : id(id)
  , extra(extra)
  {}

  uint32_t id;
  uint32_t extra;

  bool isNull() const { return id == 0; }

  bool operator==(const PickRenderValues& rhs) const
  {
    return id == rhs.id && extra == rhs.extra;
  }

  bool operator<(const PickRenderValues& rhs) const
  {
    if (id != rhs.id)
    {
      return id < rhs.id;
    }

    return extra < rhs.extra;
  }
};

class Pickable
{
public:
  virtual Picked translatePick(PickRenderValues id) = 0;
};

template<typename T>
T intToFloat4(uint32_t id)
{
  return T((id & 0xff)/255.0, ((id >> 8) & 0xff)/255.0, ((id >> 16) & 0xff)/255.0, (id >> 24)/255.0);
}

template<typename T>
uint32_t float4ToInt(T t)
{
  return (uint8_t)(t[0] * 255.0) | ((uint8_t)(t[1] * 255.0) << 8) | ((uint8_t)(t[2] * 255.0) << 16) | ((uint8_t)(t[3] * 255.0) << 24);
}

}

#endif // RVE_RENDER_SERVER_PICKABLE_H