101 lines
2.5 KiB
C++
101 lines
2.5 KiB
C++
// Filename: triangleMesh.cxx
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// Created by: drose (06Nov99)
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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 "triangleMesh.h"
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#include "geomTristrip.h"
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TriangleMesh::
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TriangleMesh(int x_verts, int y_verts) :
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_coords(PTA_Vertexf::empty_array(0)),
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_norms(PTA_Normalf::empty_array(0)),
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_colors(PTA_Colorf::empty_array(0)),
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_texcoords(PTA_TexCoordf::empty_array(0)),
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_x_verts(x_verts),
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_y_verts(y_verts)
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{
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}
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int TriangleMesh::
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get_x_verts() const {
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return _x_verts;
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}
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int TriangleMesh::
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get_y_verts() const {
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return _y_verts;
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}
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int TriangleMesh::
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get_num_verts() const {
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return _x_verts * _y_verts;
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}
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GeomTristrip *TriangleMesh::
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build_mesh() const {
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// int num_verts = _x_verts * _y_verts;
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int num_tstrips = (_y_verts-1);
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int tstrip_length = 2*(_x_verts-1)+2;
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PTA_int lengths = PTA_int::empty_array(num_tstrips);
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PTA_ushort vindex = PTA_ushort::empty_array(num_tstrips * tstrip_length);
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// Set the lengths array. We are creating num_tstrips T-strips,
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// each of which has t_strip length vertices.
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int n;
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for (n = 0; n < num_tstrips; n++) {
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lengths[n] = tstrip_length;
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}
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// Now fill up the index array into the vertices. This lays out the
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// order of the vertices in each T-strip.
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n = 0;
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int ti, si;
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for (ti = 1; ti < _y_verts; ti++) {
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vindex[n++] = ti * _x_verts;
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for (si = 1; si < _x_verts; si++) {
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vindex[n++] = (ti - 1) * _x_verts + (si-1);
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vindex[n++] = ti * _x_verts + si;
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}
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vindex[n++] = (ti - 1) * _x_verts + (_x_verts-1);
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}
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assert(n==num_tstrips * tstrip_length);
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GeomTristrip *geom = new GeomTristrip;
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geom->set_num_prims(num_tstrips);
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geom->set_lengths(lengths);
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assert(!_coords.empty());
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geom->set_coords(_coords, G_PER_VERTEX, vindex);
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if (!_norms.empty()) {
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geom->set_normals(_norms, G_PER_VERTEX, vindex);
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}
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if (!_colors.empty()) {
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geom->set_colors(_colors, G_PER_VERTEX, vindex);
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}
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if (!_texcoords.empty()) {
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geom->set_texcoords(_texcoords, G_PER_VERTEX, vindex);
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}
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return geom;
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}
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