#include

#include "light.hxx" #include "sunpos.hxx" fgLIGHT cur_light_params; // Constructor fgLIGHT::fgLIGHT( void ) { } // initialize lighting tables void fgLIGHT::Init( void ) { SG_LOG( SG_EVENT, SG_INFO, "Initializing Lighting interpolation tables." ); // build the path name to the ambient lookup table SGPath path( globals->get_fg_root() ); SGPath ambient = path; ambient.append( "Lighting/ambient" ); SGPath diffuse = path; diffuse.append( "Lighting/diffuse" ); SGPath specular = path; specular.append( "Lighting/specular" ); SGPath sky = path; sky.append( "Lighting/sky" ); // initialize ambient table ambient_tbl = new SGInterpTable( ambient.str() ); // initialize diffuse table diffuse_tbl = new SGInterpTable( diffuse.str() ); // initialize diffuse table specular_tbl = new SGInterpTable( specular.str() ); // initialize sky table sky_tbl = new SGInterpTable( sky.str() ); } // update lighting parameters based on current sun position void fgLIGHT::Update( void ) { FGInterface *f; // if the 4th field is 0.0, this specifies a direction ... GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 }; // base sky color #if defined (sgi) || defined( macintosh ) GLfloat base_sky_color[4] = { 0.252, 0.403, 0.657, 1.0 }; #else // default GLfloat base_sky_color[4] = { 0.336, 0.406, 0.574, 1.0 }; #endif // base fog color GLfloat base_fog_color[4] = { 0.90, 0.90, 1.00, 1.0 }; double deg, ambient, diffuse, specular, sky_brightness; f = current_aircraft.fdm_state; SG_LOG( SG_EVENT, SG_INFO, "Updating light parameters." ); // calculate lighting parameters based on sun's relative angle to // local up deg = sun_angle * SGD_RADIANS_TO_DEGREES; SG_LOG( SG_EVENT, SG_INFO, " Sun angle = " << deg ); ambient = ambient_tbl->interpolate( deg ); diffuse = diffuse_tbl->interpolate( deg ); specular = specular_tbl->interpolate( deg ); sky_brightness = sky_tbl->interpolate( deg ); SG_LOG( SG_EVENT, SG_INFO, " ambient = " << ambient << " diffuse = " << diffuse << " specular = " << specular << " sky = " << sky_brightness ); // sky_brightness = 0.15; // used to force a dark sky (when testing) // if ( ambient < 0.02 ) { ambient = 0.02; } // if ( diffuse < 0.0 ) { diffuse = 0.0; } // if ( sky_brightness < 0.1 ) { sky_brightness = 0.1; } scene_ambient[0] = white[0] * ambient; scene_ambient[1] = white[1] * ambient; scene_ambient[2] = white[2] * ambient; scene_ambient[3] = 1.0; scene_diffuse[0] = white[0] * diffuse; scene_diffuse[1] = white[1] * diffuse; scene_diffuse[2] = white[2] * diffuse; scene_diffuse[3] = 1.0; scene_specular[0] = white[0] * specular; scene_specular[1] = white[1] * specular; scene_specular[2] = white[2] * specular; scene_specular[3] = 1.0; // set sky color sky_color[0] = base_sky_color[0] * sky_brightness; sky_color[1] = base_sky_color[1] * sky_brightness; sky_color[2] = base_sky_color[2] * sky_brightness; sky_color[3] = base_sky_color[3]; // set fog color fog_color[0] = base_fog_color[0] * sky_brightness; fog_color[1] = base_fog_color[1] * sky_brightness; fog_color[2] = base_fog_color[2] * sky_brightness; fog_color[3] = base_fog_color[3]; } // calculate fog color adjusted for sunrise/sunset effects void fgLIGHT::UpdateAdjFog( void ) { FGInterface *f; double sun_angle_deg, rotation, param1[3], param2[3]; f = current_aircraft.fdm_state; SG_LOG( SG_EVENT, SG_DEBUG, "Updating adjusted fog parameters." ); // set fog color (we'll try to match the sunset color in the // direction we are looking // Do some sanity checking ... if ( sun_rotation < -2.0 * SGD_2PI || sun_rotation > 2.0 * SGD_2PI ) { SG_LOG( SG_EVENT, SG_ALERT, "Sun rotation bad = " << sun_rotation ); exit(-1); } if ( f->get_Psi() < -2.0 * SGD_2PI || f->get_Psi() > 2.0 * SGD_2PI ) { SG_LOG( SG_EVENT, SG_ALERT, "Psi rotation bad = " << f->get_Psi() ); exit(-1); } if ( globals->get_current_view()->getHeadingOffset_deg() * SGD_DEGREES_TO_RADIANS < -2.0 * SGD_2PI || globals->get_current_view()->getHeadingOffset_deg() * SGD_DEGREES_TO_RADIANS > 2.0 * SGD_2PI ) { SG_LOG( SG_EVENT, SG_ALERT, "current view()->view offset bad = " << globals->get_current_view()->getHeadingOffset_deg() * SGD_DEGREES_TO_RADIANS ); exit(-1); } // first determine the difference between our view angle and local // direction to the sun rotation = -(sun_rotation + SGD_PI) - (f->get_Psi() - globals->get_current_view()->getHeadingOffset_deg() * SGD_DEGREES_TO_RADIANS); while ( rotation < 0 ) { rotation += SGD_2PI; } while ( rotation > SGD_2PI ) { rotation -= SGD_2PI; } rotation *= SGD_RADIANS_TO_DEGREES; // fgPrintf( SG_EVENT, SG_INFO, // " View to sun difference in degrees = %.2f\n", rotation); // next check if we are in a sunset/sunrise situation sun_angle_deg = sun_angle * SGD_RADIANS_TO_DEGREES; if ( (sun_angle_deg > 80.0) && (sun_angle_deg < 100.0) ) { /* 0.0 - 0.6 */ param1[0] = (10.0 - fabs(90.0 - sun_angle_deg)) / 20.0; param1[1] = (10.0 - fabs(90.0 - sun_angle_deg)) / 40.0; param1[2] = (10.0 - fabs(90.0 - sun_angle_deg)) / 30.0; // param2[2] = -(10.0 - fabs(90.0 - sun_angle)) / 30.0; } else { param1[0] = param1[1] = param1[2] = 0.0; } if ( rotation - 180.0 <= 0.0 ) { param2[0] = param1[0] * (180.0 - rotation) / 180.0; param2[1] = param1[1] * (180.0 - rotation) / 180.0; param2[2] = param1[2] * (180.0 - rotation) / 180.0; // printf("param1[0] = %.2f param2[0] = %.2f\n", param1[0], param2[0]); } else { param2[0] = param1[0] * (rotation - 180.0) / 180.0; param2[1] = param1[1] * (rotation - 180.0) / 180.0; param2[2] = param1[2] * (rotation - 180.0) / 180.0; // printf("param1[0] = %.2f param2[0] = %.2f\n", param1[0], param2[0]); } adj_fog_color[0] = fog_color[0] + param2[0]; if ( adj_fog_color[0] > 1.0 ) { adj_fog_color[0] = 1.0; } adj_fog_color[1] = fog_color[1] + param2[1]; if ( adj_fog_color[1] > 1.0 ) { adj_fog_color[1] = 1.0; } adj_fog_color[2] = fog_color[2] + param2[2]; if ( adj_fog_color[2] > 1.0 ) { adj_fog_color[2] = 1.0; } adj_fog_color[3] = fog_color[3]; } // Destructor fgLIGHT::~fgLIGHT( void ) { }