text: /**
   * PANDA 3D SOFTWARE
   * Copyright (c) Carnegie Mellon University.  All rights reserved.
   *
   * All use of this software is subject to the terms of the revised BSD
   * license.  You should have received a copy of this license along
   * with this source code in a file named "LICENSE."
   *
   * @file colorWriteAttrib.h
   * @author drose
   * @date 2002-03-04
   */
  
  #ifndef COLORWRITEATTRIB_H
  #define COLORWRITEATTRIB_H
  
  #include "pandabase.h"
  
  #include "renderAttrib.h"
  
  class FactoryParams;
  
  /**
   * Enables or disables writing to the color buffer.  This is primarily useful
   * for certain special effects in which it is important to write to the depth
   * buffer without affecting the color buffer.
   */
  class EXPCL_PANDA_PGRAPH ColorWriteAttrib : public RenderAttrib {
  PUBLISHED:
    enum Channels {
      // By coincidence, these bits are the same as those for
      // D3DCOLORWRITEENABLE_RED, _GREEN, _BLUE, and _ALPHA.
      C_off    = 0x000,
      C_red    = 0x001,
      C_green  = 0x002,
      C_blue   = 0x004,
      C_rgb    = 0x007,  // == C_red | C_green | C_blue
      C_alpha  = 0x008,
      C_all    = 0x00f,
    };
  
  private:
    INLINE ColorWriteAttrib(unsigned int channels = C_all);
  
  PUBLISHED:
    static CPT(RenderAttrib) make(unsigned int channels);
    static CPT(RenderAttrib) make_default();
  
    INLINE unsigned int get_channels() const;
  
  PUBLISHED:
    MAKE_PROPERTY(channels, get_channels);
  
  public:
    virtual void output(ostream &out) const;
  
  protected:
    virtual int compare_to_impl(const RenderAttrib *other) const;
    virtual size_t get_hash_impl() const;
  
  private:
    int _channels;
  
  public:
    static void register_with_read_factory();
    virtual void write_datagram(BamWriter *manager, Datagram &dg);
  
  protected:
    static TypedWritable *make_from_bam(const FactoryParams &params);
    void fillin(DatagramIterator &scan, BamReader *manager);
  
  PUBLISHED:
    static int get_class_slot() {
      return _attrib_slot;
    }
    virtual int get_slot() const {
      return get_class_slot();
    }
  
  public:
    static TypeHandle get_class_type() {
      return _type_handle;
    }
    static void init_type() {
      RenderAttrib::init_type();
      register_type(_type_handle, "ColorWriteAttrib",
                    RenderAttrib::get_class_type());
      _attrib_slot = register_slot(_type_handle, 100, new ColorWriteAttrib);
    }
    virtual TypeHandle get_type() const {
      return get_class_type();
    }
    virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
  
  private:
    static TypeHandle _type_handle;
    static int _attrib_slot;
  };
  
  #include "colorWriteAttrib.I"
  
  #endif
  