#include <simgear/compiler.h>
-#include <stdio.h>
-#include STL_IOSTREAM
+// #include <stdio.h>
+#include <math.h>
+
+// #if defined (__APPLE__)
+// // any C++ header file undefines isinf and isnan
+// // so this should be included before <iostream>
+// inline int (isinf)(double r) { return isinf(r); }
+// inline int (isnan)(double r) { return isnan(r); }
+// #endif
+
+// #include STL_IOSTREAM
#include <plib/sg.h>
#include <plib/ssg.h>
#include "cloud.hxx"
-ssgSimpleState *
-SGCloudLayer::layer_states[SGCloudLayer::SG_MAX_CLOUD_COVERAGES];
+
+static ssgStateSelector *layer_states[SGCloudLayer::SG_MAX_CLOUD_COVERAGES];
+static bool state_initialized = false;
// Constructor
SGCloudLayer::SGCloudLayer( const string &tex_path ) :
layer_root(new ssgRoot),
layer_transform(new ssgTransform),
+ state_sel(0),
texture_path(tex_path),
layer_span(0.0),
layer_asl(0.0),
layer_transition(0.0),
layer_coverage(SG_CLOUD_CLEAR),
scale(4000.0),
+ speed(0.0),
+ direction(0.0),
last_lon(0.0),
last_lat(0.0)
{
tl[0] = tl[1] = tl[2] = tl[3] = NULL;
layer[0] = layer[1] = layer[2] = layer[3] = NULL;
- for ( int i = 0; i < SG_MAX_CLOUD_COVERAGES; ++i ) {
- layer_states[i] = NULL;
- }
layer_root->addKid(layer_transform);
rebuild();
}
}
void
-SGCloudLayer::setElevation_m (float elevation_m)
+SGCloudLayer::setElevation_m (float elevation_m, bool set_span)
{
layer_asl = elevation_m;
+
+ if (set_span) {
+ if (elevation_m > 4000)
+ setSpan_m( elevation_m * 10 );
+ else
+ setSpan_m( 40000 );
+ }
}
float
void
SGCloudLayer::rebuild()
{
- // Initialize states and sizes if necessary.
- if ( layer_states[0] == NULL ) {
+ // Initialize states and sizes if necessary.
+ if ( !state_initialized ) {
+ state_initialized = true;
+
+ SG_LOG(SG_ASTRO, SG_INFO, "initializing cloud layers");
+
SGPath cloud_path;
+ ssgStateSelector *state_sel;
+ ssgSimpleState *state;
+ state_sel = new ssgStateSelector( 2 );
+ state_sel->ref();
cloud_path.set(texture_path.str());
cloud_path.append("overcast.rgb");
- layer_states[SG_CLOUD_OVERCAST] = SGCloudMakeState(cloud_path.str());
+ state_sel->setStep( 0, sgCloudMakeState(cloud_path.str()) );
+ cloud_path.set(texture_path.str());
+ cloud_path.append("overcast_top.rgb");
+ state_sel->setStep( 1, sgCloudMakeState(cloud_path.str()) );
+ layer_states[SG_CLOUD_OVERCAST] = state_sel;
+ state_sel = new ssgStateSelector( 2 );
+ state_sel->ref();
cloud_path.set(texture_path.str());
cloud_path.append("broken.rgba");
- layer_states[SG_CLOUD_BROKEN]
- = SGCloudMakeState(cloud_path.str());
+ state = sgCloudMakeState(cloud_path.str());
+ state_sel->setStep( 0, state );
+ state_sel->setStep( 1, state );
+ layer_states[SG_CLOUD_BROKEN] = state_sel;
+ state_sel = new ssgStateSelector( 2 );
+ state_sel->ref();
cloud_path.set(texture_path.str());
cloud_path.append("scattered.rgba");
- layer_states[SG_CLOUD_SCATTERED]
- = SGCloudMakeState(cloud_path.str());
+ state = sgCloudMakeState(cloud_path.str());
+ state_sel->setStep( 0, state );
+ state_sel->setStep( 1, state );
+ layer_states[SG_CLOUD_SCATTERED] = state_sel;
+ state_sel = new ssgStateSelector( 2 );
+ state_sel->ref();
cloud_path.set(texture_path.str());
cloud_path.append("few.rgba");
- layer_states[SG_CLOUD_FEW]
- = SGCloudMakeState(cloud_path.str());
+ state = sgCloudMakeState(cloud_path.str());
+ state_sel->setStep( 0, state );
+ state_sel->setStep( 1, state );
+ layer_states[SG_CLOUD_FEW] = state_sel;
+ state_sel = new ssgStateSelector( 2 );
+ state_sel->ref();
cloud_path.set(texture_path.str());
cloud_path.append("cirrus.rgba");
- layer_states[SG_CLOUD_CIRRUS]
- = SGCloudMakeState(cloud_path.str());
+ state = sgCloudMakeState(cloud_path.str());
+ state_sel->setStep( 0, state );
+ state_sel->setStep( 1, state );
+ layer_states[SG_CLOUD_CIRRUS] = state_sel;
layer_states[SG_CLOUD_CLEAR] = 0;
}
const float layer_scale = layer_span / scale;
const float mpi = SG_PI/4;
+ // caclculate the difference between a flat-earth model and
+ // a round earth model given the span and altutude ASL of
+ // the cloud layer. This is the difference in altitude between
+ // the top of the inverted bowl and the edge of the bowl.
+ // const float alt_diff = layer_asl * 0.8;
+ const float layer_to_core = (SG_EARTH_RAD * 1000 + layer_asl);
+ const float layer_angle = acos( 0.5*layer_span / layer_to_core);
+ const float border_to_core = layer_to_core * sin(layer_angle);
+ const float alt_diff = layer_to_core - border_to_core;
+
for (int i = 0; i < 4; i++)
{
if ( layer[i] != NULL ) {
sgSetVec3( vertex, layer_span*(i-2)/2, -layer_span,
- 500 * (sin(i*mpi) - 2) );
+ alt_diff * (sin(i*mpi) - 2) );
sgSetVec2( tc, base[0] + layer_scale * i/4, base[1] );
for (int j = 0; j < 4; j++)
{
sgSetVec3( vertex, layer_span*(i-1)/2, layer_span*(j-2)/2,
- 500 * (sin((i+1)*mpi) + sin(j*mpi) - 2) );
+ alt_diff * (sin((i+1)*mpi) + sin(j*mpi) - 2) );
sgSetVec2( tc, base[0] + layer_scale * (i+1)/4,
base[1] + layer_scale * j/4 );
sgSetVec3( vertex, layer_span*(i-2)/2, layer_span*(j-1)/2,
- 500 * (sin(i*mpi) + sin((j+1)*mpi) - 2) );
+ alt_diff * (sin(i*mpi) + sin((j+1)*mpi) - 2) );
sgSetVec2( tc, base[0] + layer_scale * i/4,
base[1] + layer_scale * (j+1)/4 );
}
sgSetVec3( vertex, layer_span*(i-1)/2, layer_span,
- 500 * (sin((i+1)*mpi) - 2) );
+ alt_diff * (sin((i+1)*mpi) - 2) );
sgSetVec2( tc, base[0] + layer_scale * (i+1)/4,
base[1] + layer_scale );
if ( layer_states[layer_coverage] != NULL ) {
layer[i]->setState( layer_states[layer_coverage] );
}
+ state_sel = layer_states[layer_coverage];
}
// force a repaint of the sky colors with arbitrary defaults
// spin specifies a rotation about the new Z axis (and orients the
// sunrise/set effects
bool SGCloudLayer::reposition( sgVec3 p, sgVec3 up, double lon, double lat,
- double alt )
+ double alt, double dt )
{
sgMat4 T1, LON, LAT;
sgVec3 axis;
last_lat = lat;
}
- if ( lon != last_lon || lat != last_lat ) {
+ double sp_dist = speed*dt;
+
+ if ( lon != last_lon || lat != last_lat || sp_dist != 0 ) {
Point3D start( last_lon, last_lat, 0.0 );
Point3D dest( lon, lat, 0.0 );
- double course, dist;
+ double course = 0.0, dist = 0.0;
+
calc_gc_course_dist( dest, start, &course, &dist );
// cout << "course = " << course << ", dist = " << dist << endl;
- double xoff = cos( course ) * dist / (2 * scale);
- double yoff = sin( course ) * dist / (2 * scale);
+ // if start and dest are too close together,
+ // calc_gc_course_dist() can return a course of "nan". If
+ // this happens, lets just use the last known good course.
+ // This is a hack, and it would probably be better to make
+ // calc_gc_course_dist() more robust.
+ if ( isnan(course) ) {
+ course = last_course;
+ } else {
+ last_course = course;
+ }
+
+ // calculate cloud movement due to external forces
+ double ax = 0.0, ay = 0.0, bx = 0.0, by = 0.0;
+
+ if (dist > 0.0) {
+ ax = cos(course) * dist;
+ ay = sin(course) * dist;
+ }
+
+ if (sp_dist > 0) {
+ bx = cos(-direction * SGD_DEGREES_TO_RADIANS) * sp_dist;
+ by = sin(-direction * SGD_DEGREES_TO_RADIANS) * sp_dist;
+ }
+
+
+ double xoff = (ax + bx) / (2 * scale);
+ double yoff = (ay + by) / (2 * scale);
const float layer_scale = layer_span / scale;
if ( base[0] > -10.0 && base[0] < 10.0 ) {
base[0] -= (int)base[0];
} else {
- base[0] = 0.0;
SG_LOG(SG_ASTRO, SG_DEBUG,
- "Error: base = " << base[0] << "," << base[1]);
+ "Error: base = " << base[0] << "," << base[1] <<
+ " course = " << course << " dist = " << dist );
+ base[0] = 0.0;
}
base[1] += yoff;
if ( base[1] > -10.0 && base[1] < 10.0 ) {
base[1] -= (int)base[1];
} else {
- base[1] = 0.0;
SG_LOG(SG_ASTRO, SG_ALERT,
- "Error: base = " << base[0] << "," << base[1]);
+ "Error: base = " << base[0] << "," << base[1] <<
+ " course = " << course << " dist = " << dist );
+ base[1] = 0.0;
}
- // cout << "base = " << base[0] << "," << base[1] << endl;
+ // cout << "base = " << base[0] << "," << base[1] << endl;
for (int i = 0; i < 4; i++)
{
}
-void SGCloudLayer::draw() {
+void SGCloudLayer::draw( bool top ) {
if ( layer_coverage != SG_CLOUD_CLEAR ) {
+ state_sel->selectStep( top ? 1 : 0 );
ssgCullAndDraw( layer_root );
}
}
// make an ssgSimpleState for a cloud layer given the named texture
-ssgSimpleState *SGCloudMakeState( const string &path ) {
+ssgSimpleState *sgCloudMakeState( const string &path ) {
ssgSimpleState *state = new ssgSimpleState();
+ SG_LOG(SG_ASTRO, SG_INFO, " texture = ");
+
state->setTexture( (char *)path.c_str() );
state->setShadeModel( GL_SMOOTH );
state->disable( GL_LIGHTING );
state->enable( GL_TEXTURE_2D );
state->enable( GL_COLOR_MATERIAL );
state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
- state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
- state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
+ state->setMaterial( GL_EMISSION, 0.05, 0.05, 0.05, 0.0 );
+ state->setMaterial( GL_AMBIENT, 0.2, 0.2, 0.2, 0.0 );
+ state->setMaterial( GL_DIFFUSE, 0.5, 0.5, 0.5, 0.0 );
+ state->setMaterial( GL_SPECULAR, 0.0, 0.0, 0.0, 0.0 );
state->enable( GL_BLEND );
state->enable( GL_ALPHA_TEST );
state->setAlphaClamp( 0.01 );
- // ref() the state so it doesn't get deleted if the last layer of
- // it's type is deleted.
- state->ref();
-
return state;
}
projects / simgear.git / blobdiff