mirror of
https://github.com/nasa/trick.git
synced 2024-12-28 08:58:53 +00:00
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
#if ( __APPLE__ )
|
|
# include <GLUT/glut.h>
|
|
#else
|
|
# include <GL/glut.h>
|
|
#endif
|
|
#include <math.h>
|
|
#include <stdio.h>
|
|
|
|
#ifndef PI
|
|
#define PI 3.14159265358979323846
|
|
#endif
|
|
|
|
#include "earth_texture.i"
|
|
static GLuint earthTextureID = 0;
|
|
|
|
static GLuint BallListID = 0;
|
|
|
|
void Ball_initialize() {
|
|
|
|
int n_lats = 90;
|
|
int n_lons = 180;
|
|
int ii,jj;
|
|
|
|
earthTextureID = MakeTexture(Earth_texture, EARTH_TEXTURE_WIDTH, EARTH_TEXTURE_HEIGHT);
|
|
|
|
if (BallListID == 0) {
|
|
|
|
BallListID = glGenLists(1);
|
|
|
|
glNewList( BallListID, GL_COMPILE);
|
|
|
|
glEnable(GL_LIGHTING);
|
|
glBindTexture(GL_TEXTURE_2D, earthTextureID);
|
|
glEnable(GL_TEXTURE_2D);
|
|
|
|
|
|
for(ii = 0; ii <= n_lats; ii++) {
|
|
|
|
double lat0 = PI * (-0.5 + (double) (ii - 1) / n_lats);
|
|
double z0 = sin(lat0);
|
|
double zr0 = cos(lat0);
|
|
|
|
double lat1 = PI * (-0.5 + (double) ii / n_lats);
|
|
double z1 = sin(lat1);
|
|
double zr1 = cos(lat1);
|
|
|
|
glBegin(GL_QUAD_STRIP);
|
|
for(jj = 0; jj <= n_lons; jj++) {
|
|
double lon = 2 * PI * (double) (jj - 1) / n_lons;
|
|
double x = cos(lon);
|
|
double y = sin(lon);
|
|
|
|
glTexCoord2d( 0.0, 0.0);
|
|
glNormal3d(x * zr0, y * zr0, z0);
|
|
glVertex3d(x * zr0, y * zr0, z0);
|
|
|
|
glTexCoord2d( 1.0, 1.0);
|
|
glNormal3d(x * zr1, y * zr1, z1);
|
|
glVertex3d(x * zr1, y * zr1, z1);
|
|
}
|
|
glEnd();
|
|
}
|
|
glEndList();
|
|
}
|
|
}
|
|
|
|
void Ball_display(void) {
|
|
|
|
glMatrixMode(GL_MODELVIEW);
|
|
glPushMatrix();
|
|
glScaled(6367500.0, 6367500.0, 6367500.0);
|
|
glCallList(BallListID);
|
|
glPopMatrix();
|
|
|
|
}
|