Pro OpenGL ES for iOS

124 CHAPTER 4: Turning On the Lights^

GLfloat dimcyan[]={0.0,.5,.5,1.0};

//Lights go here.

glLightfv(SS_SUNLIGHT,GL_POSITION,sunPos);

glLightfv(SS_SUNLIGHT,GL_DIFFUSE,white);

glLightfv(SS_SUNLIGHT,GL_SPECULAR,yellow);

glLightfv(SS_FILLLIGHT1,GL_POSITION,posFill1);

glLightfv(SS_FILLLIGHT1,GL_DIFFUSE,dimblue);

glLightfv(SS_FILLLIGHT1,GL_SPECULAR,dimcyan);

glLightfv(SS_FILLLIGHT2,GL_POSITION,posFill2);

glLightfv(SS_FILLLIGHT2,GL_SPECULAR,dimmagenta);

glLightfv(SS_FILLLIGHT2,GL_DIFFUSE,dimblue);

//Materials go here.

glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, cyan);

glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, white);

glLightf(SS_SUNLIGHT,GL_QUADRATIC_ATTENUATION,.001);

glMaterialf(GL_FRONT_AND_BACK,GL_SHININESS,25);

glShadeModel(GL_SMOOTH);

glLightModelf(GL_LIGHT_MODEL_TWO_SIDE,0.0);

glEnable(GL_LIGHTING);

glEnable(SS_SUNLIGHT);

glEnable(SS_FILLLIGHT1);

glEnable(SS_FILLLIGHT2);

}

Naturally, the top-level execute method solar-system controller has to be completely

overhauled, along with the addition of a small utility function, as shown in Listing 4-9.

Listing 4-9. Solar-System execute methods

-(void)execute

{

GLfloat paleYellow[]={1.0,1.0,0.3,1.0}; //1

GLfloat white[]={1.0,1.0,1.0,1.0};

GLfloat cyan[]={0.0,1.0,1.0,1.0};

GLfloat black[]={0.0,0.0,0.0,0.0}; //2

static GLfloat angle=0.0;

GLfloat orbitalIncrement=1.25; //3

GLfloat sunPos[3]={0.0,0.0,0.0,1.0};