// Filename: renderModeAttrib.I
// Created by:  drose (14Mar02)
//
////////////////////////////////////////////////////////////////////
//
// 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."
//
////////////////////////////////////////////////////////////////////


////////////////////////////////////////////////////////////////////
//     Function: RenderModeAttrib::Constructor
//       Access: Private
//  Description: Use RenderModeAttrib::make() to construct a new
//               RenderModeAttrib object.
////////////////////////////////////////////////////////////////////
INLINE RenderModeAttrib::
RenderModeAttrib(RenderModeAttrib::Mode mode, float thickness,
                 bool perspective) :
  _mode(mode),
  _thickness(thickness),
  _perspective(perspective)
{
}

////////////////////////////////////////////////////////////////////
//     Function: RenderModeAttrib::get_mode
//       Access: Published
//  Description: Returns the render mode.
////////////////////////////////////////////////////////////////////
INLINE RenderModeAttrib::Mode RenderModeAttrib::
get_mode() const {
  return _mode;
}

////////////////////////////////////////////////////////////////////
//     Function: RenderModeAttrib::get_thickness
//       Access: Published
//  Description: Returns the line width or point thickness.  This is
//               only relevant when rendering points or lines, such as
//               when the mode is M_wireframe or M_point (or when
//               rendering actual points or lines primitives in
//               M_polygon mode).
////////////////////////////////////////////////////////////////////
INLINE float RenderModeAttrib::
get_thickness() const {
  return _thickness;
}

////////////////////////////////////////////////////////////////////
//     Function: RenderModeAttrib::get_perspective
//       Access: Published
//  Description: Returns the perspective flag.  When this is true, the
//               point thickness represented by get_thickness() is
//               actually a width in 3-d units, and the points should
//               scale according to perspective.  When it is false,
//               the default, the point thickness is actually a width
//               in pixels, and points are a uniform size regardless
//               of distance from the camera.
////////////////////////////////////////////////////////////////////
INLINE bool RenderModeAttrib::
get_perspective() const {
  return _perspective;
}

////////////////////////////////////////////////////////////////////
//     Function: RenderModeAttrib::get_geom_rendering
//       Access: Published
//  Description: Returns the union of the Geom::GeomRendering bits
//               that will be required once this RenderModeAttrib is
//               applied to a geom which includes the indicated
//               geom_rendering bits.
////////////////////////////////////////////////////////////////////
INLINE int RenderModeAttrib::
get_geom_rendering(int geom_rendering) const {
  if (_mode == M_point) {
    geom_rendering |= Geom::GR_point;
  }
  if ((geom_rendering & Geom::GR_point) != 0) {
    if (_perspective) {
      geom_rendering |= (Geom::GR_point_perspective | Geom::GR_point_uniform_size);
    } else if (_thickness != 1.0f) {
      geom_rendering |= Geom::GR_point_uniform_size;
    }
  }

  return geom_rendering;
}