153 lines
4.5 KiB
C++
153 lines
4.5 KiB
C++
/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file uvScrollNode.cxx
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* @author drose
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* @date 2002-03-16
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*/
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#include "uvScrollNode.h"
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#include "bamReader.h"
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#include "cullTraverserData.h"
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#include "datagram.h"
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#include "datagramIterator.h"
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#include "luse.h"
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#include "renderState.h"
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#include "texMatrixAttrib.h"
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#include "textureStage.h"
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#include "transformState.h"
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TypeHandle UvScrollNode::_type_handle;
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/**
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* Returns a newly-allocated Node that is a shallow copy of this one. It will
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* be a different Node pointer, but its internal data may or may not be shared
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* with that of the original Node.
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*/
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PandaNode *UvScrollNode::
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make_copy() const {
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return new UvScrollNode(*this);
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}
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/**
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* Tells the BamReader how to create objects of type UvScrollNode.
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*/
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void UvScrollNode::
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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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* Writes the contents of this object to the datagram for shipping out to a
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* Bam file.
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*/
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void UvScrollNode::
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write_datagram(BamWriter *manager, Datagram &dg) {
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PandaNode::write_datagram(manager, dg);
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dg.add_stdfloat(_u_speed);
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dg.add_stdfloat(_v_speed);
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if (manager->get_file_minor_ver() >= 33) {
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dg.add_stdfloat(_w_speed);
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}
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if (manager->get_file_minor_ver() >= 22) {
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dg.add_stdfloat(_r_speed);
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}
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}
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/**
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* This function is called by the BamReader's factory when a new object of
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* type ModelNode is encountered in the Bam file. It should create the
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* ModelNode and extract its information from the file.
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*/
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TypedWritable *UvScrollNode::
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make_from_bam(const FactoryParams ¶ms) {
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UvScrollNode *node = new UvScrollNode("");
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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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node->fillin(scan, manager);
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return node;
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}
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/**
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* This internal function is called by make_from_bam to read in all of the
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* relevant data from the BamFile for the new ModelNode.
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*/
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void UvScrollNode::
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fillin(DatagramIterator &scan, BamReader *manager) {
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PandaNode::fillin(scan, manager);
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_u_speed = scan.get_stdfloat();
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_v_speed = scan.get_stdfloat();
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if (manager->get_file_minor_ver() >= 33) {
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_w_speed = scan.get_stdfloat();
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}
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if (manager->get_file_minor_ver() >= 22) {
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_r_speed = scan.get_stdfloat();
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}
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}
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/**
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* This function will be called during the cull traversal to perform any
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* additional operations that should be performed at cull time. This may
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* include additional manipulation of render state or additional
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* visible/invisible decisions, or any other arbitrary operation.
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*
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* Note that this function will *not* be called unless set_cull_callback() is
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* called in the constructor of the derived class. It is necessary to call
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* set_cull_callback() to indicated that we require cull_callback() to be
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* called.
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*
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* By the time this function is called, the node has already passed the
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* bounding-volume test for the viewing frustum, and the node's transform and
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* state have already been applied to the indicated CullTraverserData object.
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*
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* The return value is \true if this node should be visible, or false if it
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* should be culled.
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*/
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bool UvScrollNode::
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cull_callback(CullTraverser * trav, CullTraverserData &data) {
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double elapsed = ClockObject::get_global_clock()->get_frame_time() - _start_time;
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CPT(TransformState) ts = TransformState::make_pos_hpr(
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LVecBase3(cmod(elapsed * _u_speed, 1.0) / 1.0,
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cmod(elapsed * _v_speed, 1.0) / 1.0,
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cmod(elapsed * _w_speed, 1.0) / 1.0),
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LVecBase3((cmod(elapsed * _r_speed, 1.0) / 1.0) * 360, 0, 0));
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CPT(RenderAttrib) tm = TexMatrixAttrib::make(TextureStage::get_default(), ts);
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CPT(RenderState) rs = RenderState::make_empty()->set_attrib(tm);
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data._state = data._state->compose(rs);
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return true;
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}
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/**
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* Returns true if it is generally safe to flatten out this particular kind of
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* PandaNode by duplicating instances (by calling dupe_for_flatten()), false
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* otherwise (for instance, a Camera cannot be safely flattened, because the
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* Camera pointer itself is meaningful).
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*/
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bool UvScrollNode::
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safe_to_flatten() const {
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return false;
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}
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/**
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* Returns true if it is generally safe to combine this with other nodes,
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* which it isn't, so don't. Ever.
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*/
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bool UvScrollNode::
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safe_to_combine() const {
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return false;
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}
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