geomPoints.cxx

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/**
 * 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 geomPoints.cxx
 * @author drose
 * @date 2005-03-22
 */

#include "geomPoints.h"
#include "pStatTimer.h"
#include "bamReader.h"
#include "bamWriter.h"
#include "graphicsStateGuardianBase.h"

TypeHandle GeomPoints::_type_handle;

/**
 *
 */
GeomPoints::
GeomPoints(GeomPoints::UsageHint usage_hint) :
  GeomPrimitive(usage_hint)
{
}

/**
 *
 */
GeomPoints::
GeomPoints(const GeomPoints &copy) :
  GeomPrimitive(copy)
{
}

/**
 *
 */
GeomPoints::
~GeomPoints() {
}

/**
 *
 */
PT(GeomPrimitive) GeomPoints::
make_copy() const {
  return new GeomPoints(*this);
}

/**
 * Returns the fundamental rendering type of this primitive: whether it is
 * points, lines, or polygons.
 *
 * This is used to set up the appropriate antialiasing settings when
 * AntialiasAttrib::M_auto is in effect; it also implies the type of primitive
 * that will be produced when decompose() is called.
 */
GeomPrimitive::PrimitiveType GeomPoints::
get_primitive_type() const {
  return PT_points;
}

/**
 * Returns the set of GeomRendering bits that represent the rendering
 * properties required to properly render this primitive.
 */
int GeomPoints::
get_geom_rendering() const {
  // Fancy point attributes, if any, are based on whether the appropriate
  // columns are defined in the associated GeomVertexData; these bits will be
  // added by Geom::get_geom_rendering().
  if (is_indexed()) {
    return GR_point | GR_indexed_point;
  } else {
    return GR_point;
  }
}

/**
 * If the primitive type is a simple type in which all primitives have the
 * same number of vertices, like points, returns the number of vertices per
 * primitive.  If the primitive type is a more complex type in which different
 * primitives might have different numbers of vertices, for instance a point
 * strip, returns 0.
 */
int GeomPoints::
get_num_vertices_per_primitive() const {
  return 1;
}

/**
 * Returns the minimum number of vertices that must be added before
 * close_primitive() may legally be called.
 */
int GeomPoints::
get_min_num_vertices_per_primitive() const {
  return 1;
}

/**
 * Calls the appropriate method on the GSG to draw the primitive.
 */
bool GeomPoints::
draw(GraphicsStateGuardianBase *gsg, const GeomPrimitivePipelineReader *reader,
     bool force) const {
  return gsg->draw_points(reader, force);
}

/**
 * Tells the BamReader how to create objects of type Geom.
 */
void GeomPoints::
register_with_read_factory() {
  BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
}

/**
 * This function is called by the BamReader's factory when a new object of
 * type Geom is encountered in the Bam file.  It should create the Geom and
 * extract its information from the file.
 */
TypedWritable *GeomPoints::
make_from_bam(const FactoryParams &params) {
  GeomPoints *object = new GeomPoints(UH_unspecified);
  DatagramIterator scan;
  BamReader *manager;

  parse_params(params, scan, manager);
  object->fillin(scan, manager);

  return object;
}