320 lines
9.1 KiB
C++
320 lines
9.1 KiB
C++
// mat.cxx -- class to handle material properties
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//
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// Written by Curtis Olson, started May 1998.
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//
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// Copyright (C) 1998 - 2000 Curtis L. Olson - http://www.flightgear.org/~curt
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// $Id$
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#ifdef HAVE_CONFIG_H
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# include <simgear_config.h>
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#endif
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#include <simgear/compiler.h>
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#include <string.h>
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#include <map>
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SG_USING_STD(map);
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#include <plib/ul.h>
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#ifdef SG_MATH_EXCEPTION_CLASH
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# include <math.h>
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#endif
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#include <simgear/debug/logstream.hxx>
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#include <simgear/misc/sg_path.hxx>
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#include <simgear/misc/sgstream.hxx>
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#include "mat.hxx"
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static map<string, ssgTexture *> _tex_cache;
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static map<string, ssgTexture *>::iterator _tex_cache_iter;
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////////////////////////////////////////////////////////////////////////
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// Constructors and destructor.
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////////////////////////////////////////////////////////////////////////
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SGMaterial::SGMaterial( const string &fg_root, const SGPropertyNode *props, const char *season )
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{
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init();
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read_properties( fg_root, props, season );
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build_ssg_state( false );
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}
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SGMaterial::SGMaterial( const string &texpath )
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{
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init();
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_internal_state st( NULL, texpath, false );
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_status.push_back( st );
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build_ssg_state( true );
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}
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SGMaterial::SGMaterial( ssgSimpleState *s )
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{
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init();
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set_ssg_state( s );
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}
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SGMaterial::~SGMaterial (void)
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{
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}
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////////////////////////////////////////////////////////////////////////
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// Public methods.
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////////////////////////////////////////////////////////////////////////
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void
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SGMaterial::read_properties( const string &fg_root, const SGPropertyNode * props, const char *season )
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{
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// Gather the path(s) to the texture(s)
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vector<SGPropertyNode_ptr> textures = props->getChildren("texture");
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for (unsigned int i = 0; i < textures.size(); i++)
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{
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string tname = textures[i]->getStringValue();
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string otname = tname;
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if (season && strncmp(season, "summer", 6))
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{
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if (tname.substr(0,7) == "Terrain")
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tname.insert(7,"."+string(season));
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}
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if (tname == "") {
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tname = "unknown.rgb";
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}
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SGPath tpath( fg_root );
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tpath.append("Textures.high");
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tpath.append(tname);
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if ( !ulFileExists(tpath.c_str()) ) {
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tpath = SGPath( fg_root );
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tpath.append("Textures");
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tpath.append(tname);
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}
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if ( ulFileExists(tpath.c_str()) ) {
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_internal_state st( NULL, tpath.str(), false );
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_status.push_back( st );
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}
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}
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if (textures.size() == 0) {
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string tname = "unknown.rgb";
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SGPath tpath( fg_root );
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tpath.append("Textures");
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tpath.append("Terrain");
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tpath.append(tname);
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_internal_state st( NULL, tpath.str(), true );
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_status.push_back( st );
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}
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xsize = props->getDoubleValue("xsize", 0.0);
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ysize = props->getDoubleValue("ysize", 0.0);
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wrapu = props->getBoolValue("wrapu", true);
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wrapv = props->getBoolValue("wrapv", true);
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mipmap = props->getBoolValue("mipmap", true);
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light_coverage = props->getDoubleValue("light-coverage", 0.0);
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// Taken from default values as used in ac3d
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ambient[0] = props->getDoubleValue("ambient/r", 0.2);
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ambient[1] = props->getDoubleValue("ambient/g", 0.2);
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ambient[2] = props->getDoubleValue("ambient/b", 0.2);
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ambient[3] = props->getDoubleValue("ambient/a", 1.0);
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diffuse[0] = props->getDoubleValue("diffuse/r", 0.8);
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diffuse[1] = props->getDoubleValue("diffuse/g", 0.8);
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diffuse[2] = props->getDoubleValue("diffuse/b", 0.8);
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diffuse[3] = props->getDoubleValue("diffuse/a", 1.0);
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specular[0] = props->getDoubleValue("specular/r", 0.0);
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specular[1] = props->getDoubleValue("specular/g", 0.0);
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specular[2] = props->getDoubleValue("specular/b", 0.0);
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specular[3] = props->getDoubleValue("specular/a", 1.0);
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emission[0] = props->getDoubleValue("emissive/r", 0.0);
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emission[1] = props->getDoubleValue("emissive/g", 0.0);
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emission[2] = props->getDoubleValue("emissive/b", 0.0);
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emission[3] = props->getDoubleValue("emissive/a", 1.0);
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shininess = props->getDoubleValue("shininess", 1.0);
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vector<SGPropertyNode_ptr> object_group_nodes =
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((SGPropertyNode *)props)->getChildren("object-group");
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for (unsigned int i = 0; i < object_group_nodes.size(); i++)
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object_groups.push_back(new SGMatModelGroup(object_group_nodes[i]));
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// read glyph table for taxi-/runway-signs
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vector<SGPropertyNode_ptr> glyph_nodes = props->getChildren("glyph");
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for (unsigned int i = 0; i < glyph_nodes.size(); i++) {
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const char *name = glyph_nodes[i]->getStringValue("name");
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if (name)
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glyphs[name] = new SGMaterialGlyph(glyph_nodes[i]);
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}
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}
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////////////////////////////////////////////////////////////////////////
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// Private methods.
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////////////////////////////////////////////////////////////////////////
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void
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SGMaterial::init ()
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{
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_status.clear();
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_current_ptr = 0;
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xsize = 0;
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ysize = 0;
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wrapu = true;
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wrapv = true;
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mipmap = true;
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light_coverage = 0.0;
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shininess = 1.0;
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for (int i = 0; i < 4; i++) {
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ambient[i] = (i < 3) ? 0.2 : 1.0;
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specular[i] = (i < 3) ? 0.0 : 1.0;
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diffuse[i] = (i < 3) ? 0.8 : 1.0;
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emission[i] = (i < 3) ? 0.0 : 1.0;
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}
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}
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bool
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SGMaterial::load_texture ( int n )
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{
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int i = (n >= 0) ? n : 0 ;
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int end = (n >= 0) ? n+1 : _status.size();
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for (; i < end; i++)
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{
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if ( !_status[i].texture_loaded ) {
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SG_LOG( SG_GENERAL, SG_INFO, "Loading deferred texture "
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<< _status[i].texture_path );
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assignTexture(_status[i].state, _status[i].texture_path,
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wrapu, wrapv, mipmap );
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_status[i].texture_loaded = true;
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}
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}
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return true;
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}
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ssgSimpleState *
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SGMaterial::get_state (int n) const
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{
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if (_status.size() == 0) {
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SG_LOG( SG_GENERAL, SG_WARN, "No state available.");
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return NULL;
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}
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ssgSimpleState *st = (n >= 0) ? _status[n].state
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: _status[_current_ptr].state;
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((SGMaterial *)this)->_current_ptr += 1;
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if (_current_ptr >= _status.size())
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((SGMaterial *)this)->_current_ptr = 0;
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return st;
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}
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void
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SGMaterial::build_ssg_state( bool defer_tex_load )
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{
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GLenum shade_model = GL_SMOOTH;
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for (unsigned int i = 0; i < _status.size(); i++)
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{
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ssgSimpleState *state = new ssgSimpleState();
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// Set up the textured state
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state->setShadeModel( shade_model );
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state->enable( GL_LIGHTING );
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state->enable ( GL_CULL_FACE ) ;
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state->enable( GL_TEXTURE_2D );
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state->disable( GL_BLEND );
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state->disable( GL_ALPHA_TEST );
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if ( !defer_tex_load ) {
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SG_LOG(SG_INPUT, SG_INFO, " " << _status[i].texture_path );
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assignTexture( state, _status[i].texture_path, wrapu, wrapv );
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_status[i].texture_loaded = true;
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} else {
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_status[i].texture_loaded = false;
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}
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state->enable( GL_COLOR_MATERIAL );
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state->setMaterial ( GL_AMBIENT,
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ambient[0], ambient[1],
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ambient[2], ambient[3] ) ;
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state->setMaterial ( GL_DIFFUSE,
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diffuse[0], diffuse[1],
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diffuse[2], diffuse[3] ) ;
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state->setMaterial ( GL_SPECULAR,
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specular[0], specular[1],
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specular[2], specular[3] ) ;
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state->setMaterial ( GL_EMISSION,
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emission[0], emission[1],
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emission[2], emission[3] ) ;
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state->setShininess ( shininess );
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_status[i].state = state;
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}
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}
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void SGMaterial::set_ssg_state( ssgSimpleState *s )
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{
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_status.push_back( _internal_state( s, "", true ) );
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}
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void SGMaterial::assignTexture( ssgSimpleState *state, string &fname,
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int _wrapu, int _wrapv, int _mipmap )
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{
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_tex_cache_iter = _tex_cache.find(fname);
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if (_tex_cache_iter == _tex_cache.end())
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{
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state->setTexture((char *)fname.c_str(), _wrapu, _wrapv, _mipmap);
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_tex_cache[fname] = state->getTexture();
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}
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else
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{
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state->setTexture(_tex_cache_iter->second);
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// cout << "Cache hit: " << fname << endl;
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}
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}
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////////////////////////////////////////////////////////////////////////
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// SGMaterialGlyph.
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////////////////////////////////////////////////////////////////////////
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SGMaterialGlyph::SGMaterialGlyph(SGPropertyNode *p) :
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_left(p->getDoubleValue("left", 0.0)),
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_right(p->getDoubleValue("right", 1.0))
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{
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}
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// end of mat.cxx
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