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https://github.com/panda3d/panda3d.git
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139 lines
4.7 KiB
C++
139 lines
4.7 KiB
C++
// Filename: qpgeomTrifans.cxx
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// Created by: drose (08Mar05)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://etc.cmu.edu/panda3d/docs/license/ .
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//
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// To contact the maintainers of this program write to
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// panda3d-general@lists.sourceforge.net .
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//
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////////////////////////////////////////////////////////////////////
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#include "qpgeomTrifans.h"
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#include "qpgeomTriangles.h"
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#include "bamReader.h"
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#include "bamWriter.h"
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TypeHandle qpGeomTrifans::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: qpGeomTrifans::Constructor
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// Access: Published
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// Description:
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////////////////////////////////////////////////////////////////////
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qpGeomTrifans::
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qpGeomTrifans() {
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}
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////////////////////////////////////////////////////////////////////
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// Function: qpGeomTrifans::Copy Constructor
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// Access: Published
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// Description:
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////////////////////////////////////////////////////////////////////
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qpGeomTrifans::
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qpGeomTrifans(const qpGeomTrifans ©) :
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qpGeomPrimitive(copy)
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{
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}
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////////////////////////////////////////////////////////////////////
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// Function: qpGeomTrifans::Destructor
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// Access: Published, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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qpGeomTrifans::
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~qpGeomTrifans() {
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}
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////////////////////////////////////////////////////////////////////
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// Function: qpGeomTrifans::draw
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// Access: Public, Virtual
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// Description: Calls the appropriate method on the GSG to draw the
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// primitive.
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////////////////////////////////////////////////////////////////////
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void qpGeomTrifans::
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draw(GraphicsStateGuardianBase *gsg) {
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gsg->draw_trifans(this);
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}
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////////////////////////////////////////////////////////////////////
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// Function: qpGeomTrifans::decompose_impl
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// Access: Published, Virtual
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// Description: Decomposes a complex primitive type into a simpler
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// primitive type, for instance triangle strips to
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// triangles, and returns a pointer to the new primitive
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// definition. If the decomposition cannot be
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// performed, this might return the original object.
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//
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// This method is useful for application code that wants
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// to iterate through the set of triangles on the
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// primitive without having to write handlers for each
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// possible kind of primitive type.
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////////////////////////////////////////////////////////////////////
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PT(qpGeomPrimitive) qpGeomTrifans::
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decompose_impl() {
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PT(qpGeomTriangles) triangles = new qpGeomTriangles;
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CPTA_ushort vertices = get_vertices();
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CPTA_int lengths = get_lengths();
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CPTA_ushort::const_iterator vi;
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vi = vertices.begin();
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CPTA_int::const_iterator li;
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for (li = lengths.begin(); li != lengths.end(); ++li) {
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int length = (*li);
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nassertr(length >= 2, triangles.p());
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int v0 = (*vi);
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++vi;
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int v1 = (*vi);
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++vi;
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for (int i = 2; i < length; i++) {
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triangles->add_vertex(v0);
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triangles->add_vertex(v1);
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triangles->add_vertex(*vi);
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triangles->close_primitive();
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++vi;
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}
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}
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return triangles.p();
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}
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////////////////////////////////////////////////////////////////////
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// Function: qpGeomTrifans::register_with_read_factory
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// Access: Public, Static
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// Description: Tells the BamReader how to create objects of type
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// qpGeom.
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////////////////////////////////////////////////////////////////////
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void qpGeomTrifans::
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register_with_read_factory() {
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BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
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}
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////////////////////////////////////////////////////////////////////
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// Function: qpGeomTrifans::make_from_bam
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// Access: Protected, Static
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// Description: This function is called by the BamReader's factory
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// when a new object of type qpGeom is encountered
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// in the Bam file. It should create the qpGeom
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// and extract its information from the file.
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////////////////////////////////////////////////////////////////////
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TypedWritable *qpGeomTrifans::
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make_from_bam(const FactoryParams ¶ms) {
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qpGeomTrifans *object = new qpGeomTrifans;
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DatagramIterator scan;
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BamReader *manager;
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parse_params(params, scan, manager);
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object->fillin(scan, manager);
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return object;
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}
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