<div class="indent">5.5 -
<a href="#5.5">Why is FlightGear so slow?</a>
</div>
- <div class="indent">5.6 -
- <a href="#5.6">Why is my SGI machine so slow?</a>
- </div>
<div class="indent">5.7 -
<a href="#5.7">How do I see the frame rate?</a>
</div>
like <i>Quake3</i>.</p>
</div>
- <b>
- <a name="5.6">5.6 -
- <u>Why is my SGI machine so slow?</u>
- </a>
- </b>
- <div class="indent">
- <p>First of all, one of the most common mistakes on SGI hardware is to
- forget to specify --fog-fastest. On most SGI machines the EXP2 shading
- model isn't hardware supported resulting in frame rates below 1 frame
- per second (fps).</p>
- <p>FlightGear makes extensive use of the OpenGL z-buffer feature,which
- on most older SGI hardware is only supported in software. This means
- that the CPU has to do all the z-buffer calculations in addition to the
- other tasks FlightGear involves (flight dynamics, scenery tracking,
- pushing commands into the graphics queue, etc). The following features
- are software rendered on low-end SGI machines (like Indy and
- Indigo):</p>
- <ul>
- <li>stencil and accumulation buffer</li>
- <li>depth queuing and depth buffering</li>
- <li>fogging, lighting, clipping and transforms</li>
- <li>texturing</li>
- </ul>
- <p>This means that running FlightGear with the following options may not
- even get the desired result:</p>
- <p>
- <code>./runfgfs --fog-disable --shading-flat --disable-skyblend \</code>
- <br>
- <code>--disable-textures --disable-clouds --disable-sound \</code>
- <br>
- <code>--disable-panel --enable-hud --disable-anti-alias-hud</code>
- </p>
- <p>I could even imagine that adding --enable-wireframe doesn't work on
- these machines (I would be happy to be proven wrong though).</p>
- <p>On a machine like O2 the following options give an acceptable
- result:</p>
- <code>./runfgfs --fog-fastest --disable-sound</code>
- <p>Since I don't have access to other SGI hardware I can't tell which
- options would be appropriate for your situation.</p>
- </div>
-
<b>
<a name="5.7">5.7 -
<u>How do I see the frame rate?</u>
fgSetBool("/environment/clouds/status", true);
fgSetBool("/sim/startup/fullscreen", false);
fgSetBool("/sim/rendering/shading", true);
- fgSetBool("/sim/rendering/skyblend", true);
fgSetBool("/sim/rendering/textures", true);
fgTie( "/sim/rendering/filtering", SGGetTextureFilter, SGSetTextureFilter, false);
fgSetInt("/sim/rendering/filtering", 1);
{"restore-defaults", false, OPTION_BOOL, "/sim/startup/restore-defaults", true, "", 0 },
{"shading-flat", false, OPTION_BOOL, "/sim/rendering/shading", false, "", 0 },
{"shading-smooth", false, OPTION_BOOL, "/sim/rendering/shading", true, "", 0 },
- {"disable-skyblend", false, OPTION_BOOL, "/sim/rendering/skyblend", false, "", 0 },
- {"enable-skyblend", false, OPTION_BOOL, "/sim/rendering/skyblend", true, "", 0 },
{"disable-textures", false, OPTION_BOOL, "/sim/rendering/textures", false, "", 0 },
{"enable-textures", false, OPTION_BOOL, "/sim/rendering/textures", true, "", 0 },
{"texture-filtering", false, OPTION_INT, "/sim/rendering/filtering", 1, "", 0 },
_ysize = fgGetNode("/sim/startup/ysize", true);
_splash_alpha = fgGetNode("/sim/startup/splash-alpha", true);
- _skyblend = fgGetNode("/sim/rendering/skyblend", true);
_point_sprites = fgGetNode("/sim/rendering/point-sprites", true);
_enhanced_lighting = fgGetNode("/sim/rendering/enhanced-lighting", true);
_distance_attenuation = fgGetNode("/sim/rendering/distance-attenuation", true);
osg::Camera *camera = viewer->getCamera();
- bool skyblend = _skyblend->getBoolValue();
- if ( skyblend ) {
-
- if ( _textures->getBoolValue() ) {
- SGVec4f clearColor(l->adj_fog_color());
- camera->setClearColor(toOsg(clearColor));
- }
- } else {
- SGVec4f clearColor(l->sky_color());
+ if ( _textures->getBoolValue() ) {
+ SGVec4f clearColor(l->adj_fog_color());
camera->setClearColor(toOsg(clearColor));
}
- // update fog params if visibility has changed
- double visibility_meters = _visibility_m->getDoubleValue();
- _sky->set_visibility(visibility_meters);
-
- double altitude_m = _altitude_ft->getDoubleValue() * SG_FEET_TO_METER;
- _sky->modify_vis( altitude_m, 0.0 /* time factor, now unused */);
-
- // update the sky dome
- if ( skyblend ) {
-
- // The sun and moon distances are scaled down versions
- // of the actual distance to get both the moon and the sun
- // within the range of the far clip plane.
- // Moon distance: 384,467 kilometers
- // Sun distance: 150,000,000 kilometers
-
- double sun_horiz_eff, moon_horiz_eff;
- if (_horizon_effect->getBoolValue()) {
- sun_horiz_eff
- = 0.67 + pow(osg::clampAbove(0.5 + cos(l->get_sun_angle()),
- 0.0),
- 0.33) / 3.0;
- moon_horiz_eff
- = 0.67 + pow(osg::clampAbove(0.5 + cos(l->get_moon_angle()),
- 0.0),
- 0.33)/3.0;
- } else {
- sun_horiz_eff = moon_horiz_eff = 1.0;
- }
-
- SGSkyState sstate;
- sstate.pos = current__view->getViewPosition();
- sstate.pos_geod = current__view->getPosition();
- sstate.ori = current__view->getViewOrientation();
- sstate.spin = l->get_sun_rotation();
- sstate.gst = globals->get_time_params()->getGst();
- sstate.sun_dist = 50000.0 * sun_horiz_eff;
- sstate.moon_dist = 40000.0 * moon_horiz_eff;
- sstate.sun_angle = l->get_sun_angle();
-
- SGSkyColor scolor;
- scolor.sky_color = SGVec3f(l->sky_color().data());
- scolor.adj_sky_color = SGVec3f(l->adj_sky_color().data());
- scolor.fog_color = SGVec3f(l->adj_fog_color().data());
- scolor.cloud_color = SGVec3f(l->cloud_color().data());
- scolor.sun_angle = l->get_sun_angle();
- scolor.moon_angle = l->get_moon_angle();
-
- double delta_time_sec = _sim_delta_sec->getDoubleValue();
- _sky->reposition( sstate, *globals->get_ephem(), delta_time_sec );
- _sky->repaint( scolor, *globals->get_ephem() );
-
- //OSGFIXME
-// shadows->setupShadows(
-// current__view->getLongitude_deg(),
-// current__view->getLatitude_deg(),
-// globals->get_time_params()->getGst(),
-// globals->get_ephem()->getSunRightAscension(),
-// globals->get_ephem()->getSunDeclination(),
-// l->get_sun_angle());
-
- }
-
-// sgEnviro.setLight(l->adj_fog_color());
-// sgEnviro.startOfFrame(current__view->get_view_pos(),
-// current__view->get_world_up(),
-// current__view->getLongitude_deg(),
-// current__view->getLatitude_deg(),
-// current__view->getAltitudeASL_ft() * SG_FEET_TO_METER,
-// delta_time_sec);
-
- // OSGFIXME
-// sgEnviro.drawLightning();
-
-// double current_view_origin_airspeed_horiz_kt =
-// fgGetDouble("/velocities/airspeed-kt", 0.0)
-// * cos( fgGetDouble("/orientation/pitch-deg", 0.0)
-// * SGD_DEGREES_TO_RADIANS);
-
- // OSGFIXME
-// if( is_internal )
-// shadows->endOfFrame();
-
+ updateSky();
+
// need to call the update visitor once
_frameStamp->setCalendarTime(*globals->get_time_params()->getGmt());
_updateVisitor->setViewData(current__view->getViewPosition(),
}
}
+void
+FGRenderer::updateSky()
+{
+ // update fog params if visibility has changed
+ double visibility_meters = _visibility_m->getDoubleValue();
+ _sky->set_visibility(visibility_meters);
+
+ double altitude_m = _altitude_ft->getDoubleValue() * SG_FEET_TO_METER;
+ _sky->modify_vis( altitude_m, 0.0 /* time factor, now unused */);
+
+ FGLight *l = static_cast<FGLight*>(globals->get_subsystem("lighting"));
+
+ // The sun and moon distances are scaled down versions
+ // of the actual distance to get both the moon and the sun
+ // within the range of the far clip plane.
+ // Moon distance: 384,467 kilometers
+ // Sun distance: 150,000,000 kilometers
+
+ double sun_horiz_eff, moon_horiz_eff;
+ if (_horizon_effect->getBoolValue()) {
+ sun_horiz_eff
+ = 0.67 + pow(osg::clampAbove(0.5 + cos(l->get_sun_angle()),
+ 0.0),
+ 0.33) / 3.0;
+ moon_horiz_eff
+ = 0.67 + pow(osg::clampAbove(0.5 + cos(l->get_moon_angle()),
+ 0.0),
+ 0.33)/3.0;
+ } else {
+ sun_horiz_eff = moon_horiz_eff = 1.0;
+ }
+
+ SGSkyState sstate;
+ sstate.pos = globals->get_current_view()->getViewPosition();
+ sstate.pos_geod = globals->get_current_view()->getPosition();
+ sstate.ori = globals->get_current_view()->getViewOrientation();
+ sstate.spin = l->get_sun_rotation();
+ sstate.gst = globals->get_time_params()->getGst();
+ sstate.sun_dist = 50000.0 * sun_horiz_eff;
+ sstate.moon_dist = 40000.0 * moon_horiz_eff;
+ sstate.sun_angle = l->get_sun_angle();
+
+ SGSkyColor scolor;
+ scolor.sky_color = SGVec3f(l->sky_color().data());
+ scolor.adj_sky_color = SGVec3f(l->adj_sky_color().data());
+ scolor.fog_color = SGVec3f(l->adj_fog_color().data());
+ scolor.cloud_color = SGVec3f(l->cloud_color().data());
+ scolor.sun_angle = l->get_sun_angle();
+ scolor.moon_angle = l->get_moon_angle();
+
+ double delta_time_sec = _sim_delta_sec->getDoubleValue();
+ _sky->reposition( sstate, *globals->get_ephem(), delta_time_sec );
+ _sky->repaint( scolor, *globals->get_ephem() );
+}
+
void
FGRenderer::resize( int width, int height )
{
projects / flightgear.git / commitdiff