328 lines
12 KiB
C++
328 lines
12 KiB
C++
// Filename: spotlight.cxx
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// Created by: mike (09Jan97)
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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 "spotlight.h"
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#include "graphicsStateGuardianBase.h"
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#include "bamWriter.h"
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#include "bamReader.h"
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#include "datagram.h"
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#include "datagramIterator.h"
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#include "colorAttrib.h"
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#include "texture.h"
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#include "config_pgraph.h"
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#include "pnmImage.h"
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TypeHandle Spotlight::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::CData::make_copy
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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CycleData *Spotlight::CData::
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make_copy() const {
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return new CData(*this);
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}
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::CData::write_datagram
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// Access: Public, Virtual
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// Description: Writes the contents of this object to the datagram
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// for shipping out to a Bam file.
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////////////////////////////////////////////////////////////////////
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void Spotlight::CData::
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write_datagram(BamWriter *, Datagram &dg) const {
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dg.add_float32(_exponent);
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_specular_color.write_datagram(dg);
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_attenuation.write_datagram(dg);
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}
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::CData::fillin
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// Access: Public, Virtual
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// Description: This internal function is called by make_from_bam to
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// read in all of the relevant data from the BamFile for
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// the new Light.
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////////////////////////////////////////////////////////////////////
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void Spotlight::CData::
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fillin(DatagramIterator &scan, BamReader *) {
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_exponent = scan.get_float32();
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_specular_color.read_datagram(scan);
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_attenuation.read_datagram(scan);
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}
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::Constructor
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// Access: Published
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// Description:
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////////////////////////////////////////////////////////////////////
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Spotlight::
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Spotlight(const string &name) :
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LightLensNode(name)
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{
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}
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::Copy Constructor
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// Access: Protected
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// Description: Do not call the copy constructor directly; instead,
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// use make_copy() or copy_subgraph() to make a copy of
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// a node.
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////////////////////////////////////////////////////////////////////
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Spotlight::
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Spotlight(const Spotlight ©) :
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LightLensNode(copy),
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_cycler(copy._cycler)
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{
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}
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::make_copy
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// Access: Public, Virtual
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// Description: Returns a newly-allocated PandaNode that is a shallow
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// copy of this one. It will be a different pointer,
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// but its internal data may or may not be shared with
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// that of the original PandaNode. No children will be
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// copied.
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////////////////////////////////////////////////////////////////////
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PandaNode *Spotlight::
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make_copy() const {
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return new Spotlight(*this);
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}
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::xform
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// Access: Public, Virtual
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// Description: Transforms the contents of this PandaNode by the
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// indicated matrix, if it means anything to do so. For
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// most kinds of PandaNodes, this does nothing.
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////////////////////////////////////////////////////////////////////
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void Spotlight::
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xform(const LMatrix4f &mat) {
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LightLensNode::xform(mat);
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mark_viz_stale();
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}
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::write
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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void Spotlight::
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write(ostream &out, int indent_level) const {
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indent(out, indent_level) << *this << ":\n";
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indent(out, indent_level + 2)
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<< "color " << get_color() << "\n";
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indent(out, indent_level + 2)
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<< "specular color " << get_specular_color() << "\n";
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indent(out, indent_level + 2)
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<< "attenuation " << get_attenuation() << "\n";
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indent(out, indent_level + 2)
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<< "exponent " << get_exponent() << "\n";
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Lens *lens = get_lens();
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if (lens != (Lens *)NULL) {
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lens->write(out, indent_level + 2);
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::get_vector_to_light
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// Access: Public, Virtual
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// Description: Computes the vector from a particular vertex to this
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// light. The exact vector depends on the type of light
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// (e.g. point lights return a different result than
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// directional lights).
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//
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// The input parameters are the vertex position in
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// question, expressed in object space, and the matrix
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// which converts from light space to object space. The
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// result is expressed in object space.
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//
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// The return value is true if the result is successful,
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// or false if it cannot be computed (e.g. for an
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// ambient light).
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////////////////////////////////////////////////////////////////////
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bool Spotlight::
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get_vector_to_light(LVector3f &result, const LPoint3f &from_object_point,
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const LMatrix4f &to_object_space) {
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return false;
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}
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::make_spot
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// Access: Published, Static
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// Description: Returns a newly-generated Texture that renders a
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// circular spot image as might be cast from the
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// spotlight. This may be projected onto target
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// geometry (for instance, via
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// NodePath::project_texture()) instead of actually
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// enabling the light itself, as a cheesy way to make a
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// high-resolution spot appear on the geometry.
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//
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// pixel_width specifies the height and width of the new
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// texture in pixels, full_radius is a value in the
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// range 0..1 that indicates the relative size of the
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// fully bright center spot, and fg and bg are the
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// colors of the interior and exterior of the spot,
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// respectively.
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////////////////////////////////////////////////////////////////////
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PT(Texture) Spotlight::
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make_spot(int pixel_width, float full_radius, Colorf &fg, Colorf &bg) {
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int num_channels;
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if (fg[0] == fg[1] && fg[1] == fg[2] &&
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bg[0] == bg[1] && bg[1] == bg[2]) {
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// grayscale
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num_channels = 1;
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} else {
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// color
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num_channels = 3;
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}
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if (fg[3] != 1.0f || bg[3] != 1.0f) {
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// with alpha.
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++num_channels;
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}
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PNMImage image(pixel_width, pixel_width, num_channels);
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image.render_spot(LCAST(double, fg), LCAST(double, bg), full_radius, 1.0);
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PT(Texture) tex = new Texture("spot");
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tex->load(image);
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tex->set_border_color(bg);
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tex->set_wrap_u(Texture::WM_border_color);
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tex->set_wrap_v(Texture::WM_border_color);
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tex->set_minfilter(Texture::FT_linear);
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tex->set_magfilter(Texture::FT_linear);
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return tex;
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}
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::get_class_priority
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// Access: Published, Virtual
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// Description: Returns the relative priority associated with all
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// lights of this class. This priority is used to order
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// lights whose instance priority (get_priority()) is
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// the same--the idea is that other things being equal,
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// AmbientLights (for instance) are less important than
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// DirectionalLights.
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////////////////////////////////////////////////////////////////////
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int Spotlight::
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get_class_priority() const {
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return (int)CP_spot_priority;
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}
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::bind
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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void Spotlight::
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bind(GraphicsStateGuardianBase *gsg, const NodePath &light, int light_id) {
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gsg->bind_light(this, light, light_id);
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}
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::fill_viz_geom
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// Access: Protected, Virtual
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// Description: Fills the indicated GeomNode up with Geoms suitable
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// for rendering this light.
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////////////////////////////////////////////////////////////////////
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void Spotlight::
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fill_viz_geom(GeomNode *viz_geom) {
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Lens *lens = get_lens();
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if (lens == (Lens *)NULL) {
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return;
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}
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PT(Geom) geom = lens->make_geometry();
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if (geom == (Geom *)NULL) {
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return;
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}
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viz_geom->add_geom(geom, get_viz_state());
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}
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::get_viz_state
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// Access: Private
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// Description: Returns a RenderState for rendering the spotlight
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// visualization.
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////////////////////////////////////////////////////////////////////
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CPT(RenderState) Spotlight::
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get_viz_state() {
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return RenderState::make
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(ColorAttrib::make_flat(get_color()));
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}
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::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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// Spotlight.
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////////////////////////////////////////////////////////////////////
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void Spotlight::
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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: Spotlight::write_datagram
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// Access: Public, Virtual
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// Description: Writes the contents of this object to the datagram
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// for shipping out to a Bam file.
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////////////////////////////////////////////////////////////////////
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void Spotlight::
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write_datagram(BamWriter *manager, Datagram &dg) {
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LightLensNode::write_datagram(manager, dg);
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manager->write_cdata(dg, _cycler);
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}
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////////////////////////////////////////////////////////////////////
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// Function: Spotlight::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 Spotlight is encountered
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// in the Bam file. It should create the Spotlight
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// and extract its information from the file.
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////////////////////////////////////////////////////////////////////
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TypedWritable *Spotlight::
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make_from_bam(const FactoryParams ¶ms) {
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Spotlight *node = new Spotlight("");
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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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// Function: Spotlight::fillin
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// Access: Protected
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// Description: This internal function is called by make_from_bam to
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// read in all of the relevant data from the BamFile for
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// the new Spotlight.
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////////////////////////////////////////////////////////////////////
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void Spotlight::
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fillin(DatagramIterator &scan, BamReader *manager) {
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LightLensNode::fillin(scan, manager);
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manager->read_cdata(scan, _cycler);
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}
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