161 lines
5.6 KiB
C++
161 lines
5.6 KiB
C++
// Filename: orthographicLens.cxx
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// Created by: mike (18Feb99)
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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 "orthographicLens.h"
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#include "indent.h"
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#include "bamReader.h"
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TypeHandle OrthographicLens::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: OrthographicLens::make_copy
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// Access: Public, Virtual
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// Description: Allocates a new Lens just like this one.
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////////////////////////////////////////////////////////////////////
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PT(Lens) OrthographicLens::
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make_copy() const {
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return new OrthographicLens(*this);
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}
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////////////////////////////////////////////////////////////////////
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// Function: OrthographicLens::is_linear
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// Access: Published, Virtual
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// Description: Returns true if the lens represents a linear
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// projection (e.g. PerspectiveLens, OrthographicLens),
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// and therefore there is a valid matrix returned by
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// get_projection_mat(), or false otherwise.
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////////////////////////////////////////////////////////////////////
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bool OrthographicLens::
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is_linear() const {
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return true;
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}
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////////////////////////////////////////////////////////////////////
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// Function: OrthographicLens::is_orthographic
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// Access: Published, Virtual
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// Description: Returns true if the lens represents a orthographic
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// projection (i.e. it is a OrthographicLens), false
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// otherwise.
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////////////////////////////////////////////////////////////////////
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bool OrthographicLens::
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is_orthographic() const {
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return true;
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}
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////////////////////////////////////////////////////////////////////
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// Function: OrthographicLens::write
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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void OrthographicLens::
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write(ostream &out, int indent_level) const {
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indent(out, indent_level) << get_type() << " film size = " << get_film_size() << "\n";
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}
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////////////////////////////////////////////////////////////////////
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// Function: OrthographicLens::compute_projection_mat
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// Access: Protected, Virtual
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// Description: Computes the complete transformation matrix from 3-d
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// point to 2-d point, if the lens is linear.
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////////////////////////////////////////////////////////////////////
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void OrthographicLens::
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compute_projection_mat() {
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CoordinateSystem cs = _cs;
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if (cs == CS_default) {
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cs = get_default_coordinate_system();
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}
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float a = 2.0f / (_far_distance - _near_distance);
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float b = -(_far_distance + _near_distance) / (_far_distance - _near_distance);
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LMatrix4f canonical;
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switch (cs) {
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case CS_zup_right:
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canonical.set(1.0f, 0.0f, 0.0f, 0.0f,
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0.0f, 0.0f, a, 0.0f,
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0.0f, 1.0f, 0.0f, 0.0f,
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0.0f, 0.0f, b, 1.0f);
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break;
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case CS_yup_right:
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canonical.set(1.0f, 0.0f, 0.0f, 0.0f,
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0.0f, 1.0f, 0.0f, 0.0f,
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0.0f, 0.0f, -a, 0.0f,
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0.0f, 0.0f, b, 1.0f);
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break;
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case CS_zup_left:
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canonical.set(1.0f, 0.0f, 0.0f, 0.0f,
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0.0f, 0.0f, -a, 0.0f,
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0.0f, 1.0f, 0.0f, 0.0f,
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0.0f, 0.0f, b, 1.0f);
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break;
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case CS_yup_left:
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canonical.set(1.0f, 0.0f, 0.0f, 0.0f,
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0.0f, 1.0f, 0.0f, 0.0f,
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0.0f, 0.0f, a, 0.0f,
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0.0f, 0.0f, b, 1.0f);
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break;
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default:
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gobj_cat.error()
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<< "Invalid coordinate system " << (int)cs << " in OrthographicLens!\n";
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canonical = LMatrix4f::ident_mat();
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}
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_projection_mat = get_lens_mat_inv() * canonical * get_film_mat();
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_projection_mat_left = _projection_mat_right = _projection_mat;
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adjust_comp_flags(CF_projection_mat_inv | CF_projection_mat_left_inv |
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CF_projection_mat_right_inv,
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CF_projection_mat);
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}
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////////////////////////////////////////////////////////////////////
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// Function: OrthographicLens::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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// Lens.
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////////////////////////////////////////////////////////////////////
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void OrthographicLens::
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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: OrthographicLens::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 Lens is encountered
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// in the Bam file. It should create the Lens
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// and extract its information from the file.
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////////////////////////////////////////////////////////////////////
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TypedWritable *OrthographicLens::
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make_from_bam(const FactoryParams ¶ms) {
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OrthographicLens *lens = new OrthographicLens;
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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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lens->fillin(scan, manager);
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return lens;
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}
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