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Continuing work on ssg-ifying the sky dome.

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This commit is contained in:
curt 2000-02-29 16:13:02 +00:00
parent f14de56712
commit 8b5514fa9f
2 changed files with 120 additions and 53 deletions
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120
simgear/ephemeris/sky.cxx
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@ -78,6 +78,10 @@ static GLubyte middle_color[12][4];
static GLubyte lower_color[12][4];
// Defined the shared sky object here
FGSky current_sky;
// Constructor
FGSky::FGSky( void ) {
}
@ -89,13 +93,25 @@ FGSky::~FGSky( void ) {
// initialize the sky object and connect it into the scene graph
bool FGSky::initialize() {
sgVec3 vertex;
bool FGSky::initialize( ssgRoot *root ) {
sgVec3 color;
float theta;
int i;
// set up the state
sky_state = new ssgSimpleState();
if ( current_options.get_shading() == 1 ) {
sky_state->setShadeModel( GL_SMOOTH );
} else {
sky_state->setShadeModel( GL_FLAT );
}
sky_state->disable( GL_DEPTH_TEST );
sky_state->enable( GL_LIGHTING );
sky_state->disable( GL_FOG );
sky_state->disable( GL_CULL_FACE );
sky_state->disable( GL_TEXTURE_2D );
// initialize arrays
center_disk_vl = new ssgVertexArray( 14 );
center_disk_cl = new ssgColourArray( 14 );
@ -197,8 +213,44 @@ bool FGSky::initialize() {
lower_ring_vl->add( lower_vertex[0] );
lower_ring_cl->add( color );
// force a repaint of the colors
repaint();
// force a repaint of the sky colors with ugly defaults
sgVec3 fog_color;
sgSetVec3( fog_color, 1.0, 1.0, 1.0 );
repaint( color, fog_color, 0.0 );
// build the ssg scene graph sub tree for the sky and connected
// into the provide scene graph branch
sky_selector = new ssgSelector;
sky_transform = new ssgTransform;
ssgVtxTable *center_disk, *upper_ring, *middle_ring, *lower_ring;
center_disk = new ssgVtxTable( GL_TRIANGLE_FAN,
center_disk_vl, NULL, NULL, center_disk_cl );
upper_ring = new ssgVtxTable( GL_TRIANGLE_STRIP,
upper_ring_vl, NULL, NULL, upper_ring_cl );
middle_ring = new ssgVtxTable( GL_TRIANGLE_STRIP,
middle_ring_vl, NULL, NULL, middle_ring_cl );
lower_ring = new ssgVtxTable( GL_TRIANGLE_STRIP,
lower_ring_vl, NULL, NULL, lower_ring_cl );
center_disk->setState( sky_state );
upper_ring->setState( sky_state );
middle_ring->setState( sky_state );
lower_ring->setState( sky_state );
sky_transform->addKid( center_disk );
sky_transform->addKid( upper_ring );
sky_transform->addKid( middle_ring );
sky_transform->addKid( lower_ring );
sky_selector->addKid( sky_transform );
sky_selector->clrTraversalMaskBits( SSGTRAV_HOT );
root->addKid( sky_selector );
return true;
}
@ -206,7 +258,11 @@ bool FGSky::initialize() {
// repaint the sky colors based on current value of sun_angle, sky,
// and fog colors. This updates the color arrays for ssgVtxTable.
bool FGSky::repaint() {
// sun angle in degrees relative to verticle
// 0 degrees = high noon
// 90 degrees = sun rise/set
// 180 degrees = darkest midnight
bool FGSky::repaint( sgVec3 sky_color, sgVec3 fog_color, double sun_angle ) {
double diff;
sgVec3 outer_param, outer_amt, outer_diff;
sgVec3 middle_param, middle_amt, middle_diff;
@ -406,25 +462,51 @@ bool FGSky::repaint() {
}
// build the ssg scene graph sub tree for the sky and connected into
// the provide scene graph root
bool FGSky::build( ssgBranch *branch ) {
sky_selector = new ssgSelector;
sky_transform = new ssgTransform;
// reposition the sky at the specified origin and orientation
// lon specifies a rotation about the Z axis
// lat specifies a rotation about the new Y axis
// spin specifies a rotation about the new Z axis (and orients the
// sunrise/set effects
bool FGSky::reposition( sgVec3 p, double lon, double lat, double spin ) {
sgMat4 T, LON, LAT, SPIN;
sgVec3 axis;
ssgVtxTable *center_disk, *upper_ring, *middle_ring, *lower_ring;
// Translate to view position
// Point3D zero_elev = current_view.get_cur_zero_elev();
// xglTranslatef( zero_elev.x(), zero_elev.y(), zero_elev.z() );
sgMakeTransMat4( T, p );
center_disk = new ssgVtxTable( GL_TRIANGLE_FAN,
center_disk_vl, NULL, NULL, center_disk_cl );
// printf(" Translated to %.2f %.2f %.2f\n",
// zero_elev.x, zero_elev.y, zero_elev.z );
upper_ring = new ssgVtxTable( GL_TRIANGLE_STRIP,
upper_ring_vl, NULL, NULL, upper_ring_cl );
// Rotate to proper orientation
// printf(" lon = %.2f lat = %.2f\n", FG_Longitude * RAD_TO_DEG,
// FG_Latitude * RAD_TO_DEG);
// xglRotatef( f->get_Longitude() * RAD_TO_DEG, 0.0, 0.0, 1.0 );
sgSetVec3( axis, 0.0, 0.0, 1.0 );
sgMakeRotMat4( LON, lon * RAD_TO_DEG, axis );
middle_ring = new ssgVtxTable( GL_TRIANGLE_STRIP,
middle_ring_vl, NULL, NULL, middle_ring_cl );
// xglRotatef( 90.0 - f->get_Latitude() * RAD_TO_DEG, 0.0, 1.0, 0.0 );
sgSetVec3( axis, 0.0, 1.0, 0.0 );
sgMakeRotMat4( LAT, 90.0 - lat * RAD_TO_DEG, axis );
lower_ring = new ssgVtxTable( GL_TRIANGLE_STRIP,
lower_ring_vl, NULL, NULL, lower_ring_cl );
// xglRotatef( l->sun_rotation * RAD_TO_DEG, 0.0, 0.0, 1.0 );
sgSetVec3( axis, 0.0, 0.0, 1.0 );
sgMakeRotMat4( SPIN, spin * RAD_TO_DEG, axis );
sgMat4 TRANSFORM;
sgCopyMat4( TRANSFORM, T );
sgPreMultMat4( TRANSFORM, LON );
sgPreMultMat4( TRANSFORM, LAT );
sgPreMultMat4( TRANSFORM, SPIN );
sgCoord skypos;
sgSetCoord( &skypos, TRANSFORM );
sky_transform->setTransform( &skypos );
return true;
}

53
simgear/ephemeris/sky.hxx
View File

@ -34,24 +34,10 @@
class FGSky {
double sun_angle; // sun angle in degrees relative to verticle
// 0 degrees = high noon
// 90 degrees = sun rise/set
// 180 degrees = darkest midnight
sgVec3 sky_color; // base sky color
sgVec3 fog_color; // fog color
sgVec3 origin; // coordinates of sky placement origin
// I recommend (lon, lat, 0) relative to
// your world coordinate scheme
double lon, lat; // current lon and lat (for properly rotating
// sky)
ssgSelector *sky_selector;
ssgTransform *sky_transform;
ssgSimpleState *sky_state;
ssgVertexArray *center_disk_vl;
ssgColourArray *center_disk_cl;
@ -74,40 +60,39 @@ public:
~FGSky( void );
// initialize the sky object and connect it into the scene graph
bool initialize();
// as a kid to to the specified root
bool initialize( ssgRoot *branch );
// repaint the sky colors based on current value of sun_angle,
// sky, and fog colors. This updates the color arrays for
// ssgVtxTable.
bool repaint();
// sun angle in degrees relative to verticle
// 0 degrees = high noon
// 90 degrees = sun rise/set
// 180 degrees = darkest midnight
bool repaint( sgVec3 sky_color, sgVec3 fog_color, double sun_angle );
// build the ssg scene graph sub tree for the sky and connected
// into the provide scene graph branch
bool build( ssgBranch *branch );
// reposition the sky at the specified origin and orientation
// lon specifies a rotation about the Z axis
// lat specifies a rotation about the new Y axis
// spin specifies a rotation about the new Z axis (and orients the
// sunrise/set effects
bool reposition( sgVec3 p, double lon, double lat, double spin );
// enable the sky in the scene graph (default)
bool enable() { sky_selector->select( 1 ); }
void enable() { sky_selector->select( 1 ); }
// disable the sky in the scene graph. The leaf node is still
// there, how ever it won't be traversed on the cullandrender
// phase.
bool disable() { sky_selector->select( 0 ); }
void disable() { sky_selector->select( 0 ); }
inline void set_sun_angle( double a ) { sun_angle = a; }
inline void set_sky_color( sgVec3 color ) {
sgCopyVec3(sky_color, color);
}
inline void set_fog_color( sgVec3 color ) {
sgCopyVec3(fog_color, color);
}
inline void set_origin( sgVec3 p ) {
sgCopyVec3(origin, p);
}
inline void set_lon( double l ) { lon = l; }
inline void set_lat( double l ) { lat = l; }
};
extern FGSky current_sky;
// (Re)generate the display list
void fgSkyInit();