Re: [Flightgear-devel] Anisotropic Filtering for Runways

Curtis Olson Fri, 20 Apr 2007 15:23:18 -0700

Note that you can also activate anisotropic texture filtering external to
FlightGear with no code changes if you have nvidia hardware.  The nvidia
control panel offers a number of global configuration options.  Or you can
do it via an environment variable in linux (read the nvidia driver readme)


export __GL_DEFAULT_LOG_ANISO=3

Curt.


On 4/20/07, Olaf Flebbe wrote:


Hi,

I had the chance to get a small lecture on OSG. I tried out anisotropic
filtering for improving the look of the runways. IMHO the result is
amazing.

Compare yourself -- have a look the markings on the runway:

http://www.oflebbe.de/oflebbe/FlightGear/withoutfilter.jpg

http://www.oflebbe.de/oflebbe/FlightGear/with8filter.jpg

Without any drop in framerate ...

Filtering can be switch on and controlled as per SGMaterial.
1. == default off
Please note that only powers of two are valid.

Cheers
   olaf

Index: simgear/scene/material/mat.cxx
===================================================================
RCS file: /var/cvs/SimGear-0.3/SimGear/simgear/scene/material/mat.cxx,v
retrieving revision 1.34
diff -u -r1.34 mat.cxx
--- simgear/scene/material/mat.cxx      3 Dec 2006 17:27:46 -0000
1.34
+++ simgear/scene/material/mat.cxx      20 Apr 2007 20:59:00 -0000
@@ -141,6 +141,7 @@
   wrapu = props->getBoolValue("wrapu", true);
   wrapv = props->getBoolValue("wrapv", true);
   mipmap = props->getBoolValue("mipmap", true);
+  filtering = props->getDoubleValue("filtering", 1.0);
   light_coverage = props->getDoubleValue("light-coverage", 0.0);

   // surface values for use with ground reactions
@@ -204,6 +205,7 @@
     wrapv = true;

     mipmap = true;
+    filtering = 1.0f;
     light_coverage = 0.0;

     solid = true;
@@ -233,7 +235,7 @@
             SG_LOG( SG_GENERAL, SG_INFO, "Loading deferred texture "
                                           << _status[i].texture_path );
             assignTexture(_status[i].state.get(),
_status[i].texture_path,
-                                         wrapu, wrapv, mipmap );
+                                         wrapu, wrapv, mipmap, filtering
);
             _status[i].texture_loaded = true;
        }
     }
@@ -279,7 +281,7 @@

         if ( !defer_tex_load ) {
             SG_LOG(SG_INPUT, SG_INFO, "    " << _status[i].texture_path
);
-           assignTexture( stateSet, _status[i].texture_path, wrapu, wrapv
);
+           assignTexture( stateSet, _status[i].texture_path, wrapu,
wrapv, 1, filtering );
             _status[i].texture_loaded = true;
         } else {
             _status[i].texture_loaded = false;
@@ -316,7 +318,7 @@
}

void SGMaterial::assignTexture( osg::StateSet *state, const std::string
&fname,
-                 int _wrapu, int _wrapv, int _mipmap )
+                 int _wrapu, int _wrapv, int _mipmap, float filtering )
{
    map<string, osg::ref_ptr<osg::Texture2D> >::iterator _tex_cache_iter;
    _tex_cache_iter = _tex_cache.find(fname);
@@ -324,6 +326,7 @@
    {
       osg::Texture2D* texture = SGLoadTexture2D(fname, _wrapu, _wrapv,
                                                 mipmap ? -1 : 0);
+      texture->setMaxAnisotropy( filtering);
       state->setTextureAttributeAndModes(0, texture);
       _tex_cache[fname] = texture;
    }
Index: simgear/scene/material/mat.hxx
===================================================================
RCS file: /var/cvs/SimGear-0.3/SimGear/simgear/scene/material/mat.hxx,v
retrieving revision 1.25
diff -u -r1.25 mat.hxx
--- simgear/scene/material/mat.hxx      29 Oct 2006 19:27:09 -0000
1.25
+++ simgear/scene/material/mat.hxx      20 Apr 2007 20:59:01 -0000
@@ -252,6 +252,9 @@
   // use mipmapping?
   int mipmap;

+  // use anisotropic filtering
+  float filtering;
+
   // coverage of night lighting.
   double light_coverage;

@@ -293,7 +296,7 @@
   void build_state( bool defer_tex_load );
   void set_state( osg::StateSet *s );

-  void assignTexture( osg::StateSet *state, const std::string &fname, int
_wrapu = TRUE, int _wrapv = TRUE, int _mipmap = TRUE );
+  void assignTexture( osg::StateSet *state, const std::string &fname, int
_wrapu = TRUE, int _wrapv = TRUE, int _mipmap = TRUE, float filtering =
1.0f );

};


Index: materials.xml
===================================================================
RCS file: /var/cvs/FlightGear-0.9/data/materials.xml,v
retrieving revision 1.88
diff -u -r1.88 materials.xml
--- materials.xml       28 Jan 2007 11:43:50 -0000      1.88
+++ materials.xml       20 Apr 2007 21:13:40 -0000
@@ -126,29 +126,34 @@
<material>
  <name>pa_taxiway</name>
  <texture>Runway/pa_taxiway.rgb</texture>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_tiedown</name>
  <texture>Runway/pa_tiedown.rgb</texture>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_dspl_thresh</name>
  <texture>Runway/pa_dspl_thresh.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_dspl_arrows</name>
  <texture>Runway/pa_dspl_arrows.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_threshold</name>
  <texture>Runway/pa_threshold.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
  <wrapv>false</wrapv>
</material>

@@ -156,234 +161,273 @@
  <name>pa_L</name>
  <texture>Runway/pa_L.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_R</name>
  <texture>Runway/pa_R.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_C</name>
  <texture>Runway/pa_C.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_0l</name>
  <texture>Runway/pa_0l.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_0r</name>
  <texture>Runway/pa_0r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_1c</name>
  <texture>Runway/pa_1c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_1l</name>
  <texture>Runway/pa_1l.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_1r</name>
  <texture>Runway/pa_1r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_11</name>
  <texture>Runway/pa_11.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_2c</name>
  <texture>Runway/pa_2c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_2l</name>
  <texture>Runway/pa_2l.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_2r</name>
  <texture>Runway/pa_2r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_3c</name>
  <texture>Runway/pa_3c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_3l</name>
  <texture>Runway/pa_3l.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_3r</name>
  <texture>Runway/pa_3r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_4c</name>
  <texture>Runway/pa_4c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_4r</name>
  <texture>Runway/pa_4r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_5c</name>
  <texture>Runway/pa_5c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_5r</name>
  <texture>Runway/pa_5r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_6c</name>
  <texture>Runway/pa_6c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_6r</name>
  <texture>Runway/pa_6r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_7c</name>
  <texture>Runway/pa_7c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_7r</name>
  <texture>Runway/pa_7r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_8c</name>
  <texture>Runway/pa_8c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_8r</name>
  <texture>Runway/pa_8r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_9c</name>
  <texture>Runway/pa_9c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_9r</name>
  <texture>Runway/pa_9r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_tz_three</name>
  <texture>Runway/pa_tz_three.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_aim</name>
  <texture>Runway/pa_aim.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_tz_two_a</name>
  <texture>Runway/pa_tz_two_a.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_tz_two_b</name>
  <texture>Runway/pa_tz_two_b.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_tz_one_a</name>
  <texture>Runway/pa_tz_one_a.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_tz_one_b</name>
  <texture>Runway/pa_tz_one_b.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_centerline</name>
  <texture>Runway/pa_centerline.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pa_rest</name>
  <texture>Runway/pa_rest.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pc_taxiway</name>
  <name>dirt_rwytaxiway</name>
  <texture>Runway/pc_taxiway.rgb</texture>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pc_tiedown</name>
  <name>dirt_rwytiedown</name>
  <texture>Runway/pc_tiedown.rgb</texture>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pc_dspl_thresh</name>
  <texture>Runway/pc_dspl_thresh.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
  <name>pc_dspl_arrows</name>
  <texture>Runway/pc_dspl_arrows.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -392,6 +436,7 @@
  <texture>Runway/pc_threshold.rgb</texture>
  <wrapu>false</wrapu>
  <wrapv>false</wrapv>
+ <filtering>8.</filtering>
</material>

<material>
@@ -399,6 +444,7 @@
  <name>dirt_rwyL</name>
  <texture>Runway/pc_L.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -406,6 +452,7 @@
  <name>dirt_rwyR</name>
  <texture>Runway/pc_R.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -413,6 +460,7 @@
  <name>dirt_rwyC</name>
  <texture>Runway/pc_C.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -420,6 +468,7 @@
  <name>dirt_rwy0l</name>
  <texture>Runway/pc_0l.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -427,6 +476,7 @@
  <name>dirt_rwy0r</name>
  <texture>Runway/pc_0r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -434,6 +484,7 @@
  <name>dirt_rwy1c</name>
  <texture>Runway/pc_1c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -441,6 +492,7 @@
  <name>dirt_rwy1l</name>
  <texture>Runway/pc_1l.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -448,6 +500,7 @@
  <name>dirt_rwy1r</name>
  <texture>Runway/pc_1r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -455,6 +508,7 @@
  <name>dirt_rwy11</name>
  <texture>Runway/pc_11.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -462,6 +516,7 @@
  <name>dirt_rwy2c</name>
  <texture>Runway/pc_2c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -469,6 +524,7 @@
  <name>dirt_rwy2l</name>
  <texture>Runway/pc_2l.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -476,6 +532,7 @@
  <name>dirt_rwy2r</name>
  <texture>Runway/pc_2r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -483,6 +540,7 @@
  <name>dirt_rwy3c</name>
  <texture>Runway/pc_3c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -490,6 +548,7 @@
  <name>dirt_rwy3l</name>
  <texture>Runway/pc_3l.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -504,6 +563,7 @@
  <name>dirt_rwy4c</name>
  <texture>Runway/pc_4c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -511,6 +571,7 @@
  <name>dirt_rwy4r</name>
  <texture>Runway/pc_4r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -518,6 +579,7 @@
  <name>dirt_rwy5c</name>
  <texture>Runway/pc_5c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -525,6 +587,7 @@
  <name>dirt_rwy5r</name>
  <texture>Runway/pc_5r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -532,6 +595,7 @@
  <name>dirt_rwy6c</name>
  <texture>Runway/pc_6c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -539,6 +603,7 @@
  <name>dirt_rwy6r</name>
  <texture>Runway/pc_6r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -546,6 +611,7 @@
  <name>dirt_rwy7c</name>
  <texture>Runway/pc_7c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -553,6 +619,7 @@
  <name>dirt_rwy7r</name>
  <texture>Runway/pc_7r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -560,6 +627,7 @@
  <name>dirt_rwy8c</name>
  <texture>Runway/pc_8c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -567,6 +635,7 @@
  <name>dirt_rwy8r</name>
  <texture>Runway/pc_8r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -574,6 +643,7 @@
  <name>dirt_rwy9c</name>
  <texture>Runway/pc_9c.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -581,6 +651,7 @@
  <name>dirt_rwy9r</name>
  <texture>Runway/pc_9r.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -588,6 +659,7 @@
  <name>dirt_rwytz_three</name>
  <texture>Runway/pc_tz_three.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -595,6 +667,7 @@
  <name>dirt_rwyaim</name>
  <texture>Runway/pc_aim.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -602,6 +675,7 @@
  <name>dirt_rwytz_two_a</name>
  <texture>Runway/pc_tz_two_a.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -609,6 +683,7 @@
  <name>dirt_rwytz_two_b</name>
  <texture>Runway/pc_tz_two_b.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -616,6 +691,7 @@
  <name>dirt_rwytz_one_a</name>
  <texture>Runway/pc_tz_one_a.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -623,6 +699,7 @@
  <name>dirt_rwytz_one_b</name>
  <texture>Runway/pc_tz_one_b.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -630,6 +707,7 @@
  <name>dirt_rwycenterline</name>
  <texture>Runway/pc_centerline.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<material>
@@ -637,6 +715,7 @@
  <name>dirt_rwyrest</name>
  <texture>Runway/pc_rest.rgb</texture>
  <wrapu>false</wrapu>
+ <filtering>8.</filtering>
</material>

<!-- Default -->
Index: materials.dtd
===================================================================
RCS file: /var/cvs/FlightGear-0.9/data/materials.dtd,v
retrieving revision 1.1
diff -u -r1.1 materials.dtd
--- materials.dtd       28 Dec 2001 22:37:57 -0000      1.1
+++ materials.dtd       20 Apr 2007 21:13:54 -0000
@@ -10,7 +10,8 @@
<!ENTITY % colours "r?, g?, b?, a?">

<!ELEMENT PropertyList (material+)>
-<!ELEMENT material (name+, texture, wrapu?, wrapv?, mipmap?, xsize?,
ysize?,
+<!ELEMENT material (name+, texture, wrapu?, wrapv?, mipmap?, filtering?,
+                    xsize?, ysize?,
                    light-coverage?, ambient?, diffuse?, specular?,
emissive?)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT texture (#PCDATA)>

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--
Curtis Olson - University of Minnesota - FlightGear Project
http://baron.flightgear.org/~curt/  http://www.humanfirst.umn.edu/
http://www.flightgear.org
Unique text: 2f585eeea02e2c79d7b1d8c4963bae2d

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Re: [Flightgear-devel] Anisotropic Filtering for Runways

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