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351 lines
14 KiB
C++
351 lines
14 KiB
C++
// Filename: lightRampAttrib.cxx
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// Created by: drose (04Mar02)
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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 "lightRampAttrib.h"
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#include "attribSlots.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 LightRampAttrib::_type_handle;
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CPT(RenderAttrib) LightRampAttrib::_default;
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////////////////////////////////////////////////////////////////////
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// Function: LightRampAttrib::make_default
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// Access: Published, Static
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// Description: Constructs a new LightRampAttrib object. This
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// is the standard OpenGL lighting ramp, which clamps
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// the final light total to the 0-1 range.
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) LightRampAttrib::
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make_default() {
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if (_default == 0) {
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LightRampAttrib *attrib = new LightRampAttrib();
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_default = return_new(attrib);
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}
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return _default;
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}
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////////////////////////////////////////////////////////////////////
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// Function: LightRampAttrib::make_identity
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// Access: Published, Static
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// Description: Constructs a new LightRampAttrib object. This
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// differs from the usual OpenGL lighting model in that
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// it does not clamp the final lighting total to (0,1).
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) LightRampAttrib::
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make_identity() {
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LightRampAttrib *attrib = new LightRampAttrib();
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attrib->_mode = LRT_identity;
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: LightRampAttrib::make_single_threshold
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// Access: Published, Static
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// Description: Constructs a new LightRampAttrib object. This
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// causes the luminance of the diffuse lighting
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// contribution to be quantized using a single threshold:
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//
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// if (original_luminance > threshold0) {
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// luminance = level0;
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// } else {
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// luminance = 0.0;
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// }
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//
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) LightRampAttrib::
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make_single_threshold(float thresh0, float val0) {
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LightRampAttrib *attrib = new LightRampAttrib();
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attrib->_mode = LRT_single_threshold;
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attrib->_threshold[0] = thresh0;
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attrib->_level[0] = val0;
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: LightRampAttrib::make_double_threshold
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// Access: Published, Static
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// Description: Constructs a new LightRampAttrib object. This
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// causes the luminance of the diffuse lighting
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// contribution to be quantized using two thresholds:
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//
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// if (original_luminance > threshold1) {
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// luminance = level1;
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// } else if (original_luminance > threshold0) {
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// luminance = level0;
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// } else {
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// luminance = 0.0;
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// }
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//
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) LightRampAttrib::
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make_double_threshold(float thresh0, float val0, float thresh1, float val1) {
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LightRampAttrib *attrib = new LightRampAttrib();
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attrib->_mode = LRT_single_threshold;
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attrib->_threshold[0] = thresh0;
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attrib->_level[0] = val0;
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attrib->_threshold[1] = thresh1;
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attrib->_level[1] = val1;
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: LightRampAttrib::make_hdr0
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// Access: Published, Static
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// Description: Constructs a new LightRampAttrib object. This causes
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// an HDR tone mapping operation to be applied.
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//
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// Normally, brightness values greater than 1 cannot be
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// distinguished from each other, causing very brightly lit
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// objects to wash out white and all detail to be erased.
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// HDR tone mapping remaps brightness values in the range
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// 0-infinity into the range (0,1), making it possible to
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// distinguish detail in scenes whose brightness exceeds 1.
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//
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// However, the monitor has finite contrast. Normally, all
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// of that contrast is used to represent brightnesses in
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// the range 0-1. The HDR0 tone mapping operator 'steals'
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// one quarter of that contrast to represent brightnesses in
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// the range 1-infinity.
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//
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// FINAL_RGB = (RGB^3 + RGB^2 + RGB) / (RGB^3 + RGB^2 + RGB + 1)
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//
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) LightRampAttrib::
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make_hdr0() {
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LightRampAttrib *attrib = new LightRampAttrib();
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attrib->_mode = LRT_hdr0;
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: LightRampAttrib::make_hdr1
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// Access: Published, Static
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// Description: Constructs a new LightRampAttrib object. This causes
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// an HDR tone mapping operation to be applied.
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//
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// Normally, brightness values greater than 1 cannot be
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// distinguished from each other, causing very brightly lit
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// objects to wash out white and all detail to be erased.
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// HDR tone mapping remaps brightness values in the range
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// 0-infinity into the range (0,1), making it possible to
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// distinguish detail in scenes whose brightness exceeds 1.
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//
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// However, the monitor has finite contrast. Normally, all
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// of that contrast is used to represent brightnesses in
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// the range 0-1. The HDR1 tone mapping operator 'steals'
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// one third of that contrast to represent brightnesses in
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// the range 1-infinity.
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//
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// FINAL_RGB = (RGB^2 + RGB) / (RGB^2 + RGB + 1)
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//
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) LightRampAttrib::
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make_hdr1() {
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LightRampAttrib *attrib = new LightRampAttrib();
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attrib->_mode = LRT_hdr1;
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: LightRampAttrib::make_hdr2
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// Access: Published, Static
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// Description: Constructs a new LightRampAttrib object. This causes
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// an HDR tone mapping operation to be applied.
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//
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// Normally, brightness values greater than 1 cannot be
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// distinguished from each other, causing very brightly lit
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// objects to wash out white and all detail to be erased.
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// HDR tone mapping remaps brightness values in the range
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// 0-infinity into the range (0,1), making it possible to
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// distinguish detail in scenes whose brightness exceeds 1.
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//
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// However, the monitor has finite contrast. Normally, all
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// of that contrast is used to represent brightnesses in
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// the range 0-1. The HDR2 tone mapping operator 'steals'
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// one half of that contrast to represent brightnesses in
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// the range 1-infinity.
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//
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// FINAL_RGB = (RGB) / (RGB + 1)
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//
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) LightRampAttrib::
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make_hdr2() {
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LightRampAttrib *attrib = new LightRampAttrib();
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attrib->_mode = LRT_hdr2;
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: LightRampAttrib::output
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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void LightRampAttrib::
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output(ostream &out) const {
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out << get_type() << ":";
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switch (_mode) {
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case LRT_identity:
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out << "identity()";
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break;
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case LRT_single_threshold:
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out << "single_threshold(" << _level[0] << "," << _level[1] << "," << _threshold[0] << ")";
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break;
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case LRT_double_threshold:
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out << "double_threshold(" << _level[0] << "," << _level[1] << "," << _level[2] << "," << _threshold[0] << "," << _threshold[0] << ")";
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break;
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: LightRampAttrib::compare_to_impl
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// Access: Protected, Virtual
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// Description: Intended to be overridden by derived LightRampAttrib
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// types to return a unique number indicating whether
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// this LightRampAttrib is equivalent to the other one.
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//
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// This should return 0 if the two LightRampAttrib 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 LightRampAttrib
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// objects whose get_type() functions return the same.
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////////////////////////////////////////////////////////////////////
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int LightRampAttrib::
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compare_to_impl(const RenderAttrib *other) const {
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const LightRampAttrib *ta;
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DCAST_INTO_R(ta, other, 0);
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int compare_result = ((int)_mode - (int)ta->_mode) ;
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if (compare_result!=0) {
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return compare_result;
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}
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for (int i=0; i<2; i++) {
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if (_level[i] != ta->_level[i]) {
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return (_level[i] < ta->_level[i]) ? -1 : 1;
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}
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}
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for (int i=0; i<2; i++) {
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if (_threshold[i] != ta->_threshold[i]) {
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return (_threshold[i] < ta->_threshold[i]) ? -1 : 1;
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}
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}
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return 0;
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}
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////////////////////////////////////////////////////////////////////
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// Function: LightRampAttrib::make_default_impl
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// Access: Protected, Virtual
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// Description: Intended to be overridden by derived LightRampAttrib
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// types to specify what the default property for a
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// LightRampAttrib of this type should be.
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//
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// This should return a newly-allocated LightRampAttrib of
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// the same type that corresponds to whatever the
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// standard default for this kind of LightRampAttrib is.
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////////////////////////////////////////////////////////////////////
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RenderAttrib *LightRampAttrib::
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make_default_impl() const {
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return new LightRampAttrib;
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}
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////////////////////////////////////////////////////////////////////
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// Function: LightRampAttrib::store_into_slot
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// Access: Public, Virtual
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// Description: Stores this attrib into the appropriate slot of
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// an object of class AttribSlots.
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////////////////////////////////////////////////////////////////////
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void LightRampAttrib::
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store_into_slot(AttribSlots *slots) const {
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slots->_light_ramp = this;
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}
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////////////////////////////////////////////////////////////////////
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// Function: LightRampAttrib::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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// LightRampAttrib.
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////////////////////////////////////////////////////////////////////
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void LightRampAttrib::
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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: LightRampAttrib::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 LightRampAttrib::
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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(_mode);
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for (int i=0; i<2; i++) {
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dg.add_float32(_level[i]);
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}
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for (int i=0; i<2; i++) {
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dg.add_float32(_threshold[i]);
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: LightRampAttrib::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 LightRampAttrib is encountered
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// in the Bam file. It should create the LightRampAttrib
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// and extract its information from the file.
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////////////////////////////////////////////////////////////////////
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TypedWritable *LightRampAttrib::
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make_from_bam(const FactoryParams ¶ms) {
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LightRampAttrib *attrib = new LightRampAttrib;
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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: LightRampAttrib::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 LightRampAttrib.
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////////////////////////////////////////////////////////////////////
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void LightRampAttrib::
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fillin(DatagramIterator &scan, BamReader *manager) {
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RenderAttrib::fillin(scan, manager);
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_mode = (LightRampMode)scan.get_int8();
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for (int i=0; i<2; i++) {
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_level[i] = scan.get_float32();
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}
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for (int i=0; i<2; i++) {
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_threshold[i] = scan.get_float32();
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}
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}
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