SYSTEM SOLAIRE AVEC LIGHTING

#include <windows.h>
#include <gl\glut.h>

float g_LightPosition[3] = {0, 0, -300};
float g_bLight = true;	

void RenderScene (void)
{
	//angle of revolution for moon/earth
	static float fMoonRot = 0.0f;
	static float fEarthRot = 0.0f;



	//clear the screen with current clearing color
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

	//Save matrix state and the rotations
	glMatrixMode(GL_MODELVIEW);

	glPushMatrix();

	
	glLightfv( GL_LIGHT0, GL_POSITION, g_LightPosition );	

	// Translate view 300 units 'into' the screen
	glTranslatef(0.0f, 0.0f, -300.0f);

	//Set material color, Red
	//Sun
	glColor3ub(255, 255, 0);

	glutSolidSphere(18.0f, 15, 15);

	//Rotate coordinate system for the earth
	glRotatef(fEarthRot, 0.0, 1.0f, 0.0f);

	//Draw the Earth
	glColor3ub(0, 0, 255); //blue color
	glTranslatef(105.0f, 0.0f, 0.0f);
	glutSolidSphere(10.0f, 15, 15);

	// Moon Rotation from earth-based coordinated
	glColor3ub(200,200,200);
	glRotatef(fMoonRot, 0.0f, 1.0f, 0.0f);
	glTranslatef(30.0f, 0.0f, 0.0f);

	fMoonRot += 1.0f;
	if (fMoonRot > 360.0f )
		fMoonRot = 0.0f;

	glutSolidSphere(5.0f, 15, 15);

	//Restore the matrix
	glPopMatrix();

	//Step earth orbit 5 degrees
	fEarthRot += 1.0f;
	if ( fEarthRot > 360.0f )
		fEarthRot = 0.0f;

	glutSwapBuffers();
	glutPostRedisplay();

}

void SetupRC (void)
{

	glEnable(GL_DEPTH_TEST);
	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

	float ambience[4] = {0.5f, 0.5f, 0.5f, 1.0};		
	float diffuse[4] = {0.5f, 0.5f, 0.5f, 1.0};

	glLightfv( GL_LIGHT0, GL_AMBIENT,  ambience );
	
	glLightfv( GL_LIGHT0, GL_DIFFUSE,  diffuse );	
	
	glLightfv( GL_LIGHT0, GL_POSITION, g_LightPosition );

	glEnable(  GL_LIGHT0   );

	glEnable(  GL_LIGHTING );

	glEnable(GL_COLOR_MATERIAL);

}


void ChangeSize (GLsizei w, GLsizei h)
{
	GLfloat fAspect;

	//prevent a divide by zero
	if ( h == 0)
		h = 1;

	// Set viewport to window dimensions
	glViewport(0, 0, w, h);

	// Calculate the ratio of aspect
	fAspect = (GLfloat)w / (GLfloat)h;

	//Set the perspective coordinate system
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	
	gluPerspective(45.0f, fAspect, 1.0, 450.0 );

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

}

void main (void)
{
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
	glutCreateWindow("Solar System");
	glutDisplayFunc(RenderScene);
	glutReshapeFunc(ChangeSize);

	SetupRC();

	glutMainLoop();
}