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258 lines
8.9 KiB
C++
258 lines
8.9 KiB
C++
// Filename: colorAttrib.cxx
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// Created by: drose (22Feb02)
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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) 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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////////////////////////////////////////////////////////////////////
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#include "colorAttrib.h"
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#include "graphicsStateGuardianBase.h"
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#include "dcast.h"
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#include "bamReader.h"
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#include "bamWriter.h"
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#include "datagram.h"
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#include "datagramIterator.h"
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TypeHandle ColorAttrib::_type_handle;
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int ColorAttrib::_attrib_slot;
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CPT(RenderAttrib) ColorAttrib::_off;
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CPT(RenderAttrib) ColorAttrib::_vertex;
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////////////////////////////////////////////////////////////////////
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// Function: ColorAttrib::make_vertex
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// Access: Published, Static
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// Description: Constructs a new ColorAttrib object that indicates
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// geometry should be rendered according to its own
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// vertex color.
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) ColorAttrib::
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make_vertex() {
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if (_vertex != 0) {
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return _vertex;
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}
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ColorAttrib *attrib = new ColorAttrib(T_vertex, LColor::zero());
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_vertex = return_new(attrib);
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return _vertex;
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}
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////////////////////////////////////////////////////////////////////
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// Function: ColorAttrib::make_flat
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// Access: Published, Static
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// Description: Constructs a new ColorAttrib object that indicates
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// geometry should be rendered in the indicated color.
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) ColorAttrib::
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make_flat(const LColor &color) {
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ColorAttrib *attrib = new ColorAttrib(T_flat, color);
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: ColorAttrib::make_off
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// Access: Published, Static
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// Description: Constructs a new ColorAttrib object that indicates
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// geometry should be rendered in white.
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) ColorAttrib::
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make_off() {
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if (_off != 0) {
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return _off;
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}
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ColorAttrib *attrib = new ColorAttrib(T_off, LColor(1.0f, 1.0f, 1.0f, 1.0f));
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_off = return_new(attrib);
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return _off;
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}
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////////////////////////////////////////////////////////////////////
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// Function: ColorAttrib::make_default
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// Access: Published, Static
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// Description: Returns a RenderAttrib that corresponds to whatever
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// the standard default properties for render attributes
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// of this type ought to be.
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) ColorAttrib::
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make_default() {
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return make_off();
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}
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////////////////////////////////////////////////////////////////////
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// Function: ColorAttrib::output
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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void ColorAttrib::
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output(ostream &out) const {
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out << get_type() << ":";
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switch (get_color_type()) {
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case T_vertex:
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out << "vertex";
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break;
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case T_flat:
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out << "(" << get_color() << ")";
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break;
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case T_off:
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out << "off";
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break;
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: ColorAttrib::compare_to_impl
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// Access: Protected, Virtual
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// Description: Intended to be overridden by derived ColorAttrib
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// types to return a unique number indicating whether
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// this ColorAttrib is equivalent to the other one.
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//
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// This should return 0 if the two ColorAttrib objects
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// are equivalent, a number less than zero if this one
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// should be sorted before the other one, and a number
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// greater than zero otherwise.
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//
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// This will only be called with two ColorAttrib
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// objects whose get_type() functions return the same.
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////////////////////////////////////////////////////////////////////
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int ColorAttrib::
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compare_to_impl(const RenderAttrib *other) const {
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const ColorAttrib *ta;
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DCAST_INTO_R(ta, other, 0);
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if (_type != ta->_type) {
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return (int)_type - (int)ta->_type;
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}
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if (_type == T_flat) {
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return _color.compare_to(ta->_color);
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}
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return 0;
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}
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////////////////////////////////////////////////////////////////////
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// Function: ColorAttrib::get_hash_impl
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// Access: Protected, Virtual
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// Description: Intended to be overridden by derived RenderAttrib
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// types to return a unique hash for these particular
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// properties. RenderAttribs that compare the same with
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// compare_to_impl(), above, should return the same
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// hash; RenderAttribs that compare differently should
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// return a different hash.
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////////////////////////////////////////////////////////////////////
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size_t ColorAttrib::
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get_hash_impl() const {
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size_t hash = 0;
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hash = int_hash::add_hash(hash, (int)_type);
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if (_type == T_flat) {
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hash = _color.add_hash(hash);
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}
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return hash;
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}
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////////////////////////////////////////////////////////////////////
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// Function: ColorAttrib::get_auto_shader_attrib_impl
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// Access: Protected, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) ColorAttrib::
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get_auto_shader_attrib_impl(const RenderState *state) const {
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// For a ColorAttrib, the only relevant information is the type: is
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// it flat-shaded or vertex-shaded? The actual color value is read
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// by the shader from the graphics state.
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ColorAttrib *attrib = new ColorAttrib(_type, LColor(1.0f, 1.0f, 1.0f, 1.0f));
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: ColorAttrib::quantize_color
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// Access: Private
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// Description: Quantizes the color color to the nearest multiple of
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// 1000, just to prevent runaway accumulation of
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// only slightly-different ColorAttribs.
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////////////////////////////////////////////////////////////////////
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void ColorAttrib::
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quantize_color() {
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switch (_type) {
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case T_flat:
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_color[0] = cfloor(_color[0] * 1000.0f + 0.5f) * 0.001f;
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_color[1] = cfloor(_color[1] * 1000.0f + 0.5f) * 0.001f;
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_color[2] = cfloor(_color[2] * 1000.0f + 0.5f) * 0.001f;
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_color[3] = cfloor(_color[3] * 1000.0f + 0.5f) * 0.001f;
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break;
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case T_off:
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_color.set(1.0f, 1.0f, 1.0f, 1.0f);
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break;
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case T_vertex:
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_color.set(0.0f, 0.0f, 0.0f, 0.0f);
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break;
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: ColorAttrib::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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// ColorAttrib.
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////////////////////////////////////////////////////////////////////
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void ColorAttrib::
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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: ColorAttrib::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 ColorAttrib::
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write_datagram(BamWriter *manager, Datagram &dg) {
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RenderAttrib::write_datagram(manager, dg);
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dg.add_int8(_type);
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_color.write_datagram(dg);
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}
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////////////////////////////////////////////////////////////////////
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// Function: ColorAttrib::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 ColorAttrib is encountered
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// in the Bam file. It should create the ColorAttrib
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// and extract its information from the file.
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////////////////////////////////////////////////////////////////////
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TypedWritable *ColorAttrib::
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make_from_bam(const FactoryParams ¶ms) {
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ColorAttrib *attrib = new ColorAttrib(T_off, LColor::zero());
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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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attrib->fillin(scan, manager);
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return attrib;
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}
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////////////////////////////////////////////////////////////////////
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// Function: ColorAttrib::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 ColorAttrib.
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////////////////////////////////////////////////////////////////////
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void ColorAttrib::
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fillin(DatagramIterator &scan, BamReader *manager) {
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RenderAttrib::fillin(scan, manager);
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_type = (Type)scan.get_int8();
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_color.read_datagram(scan);
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quantize_color();
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}
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