Pro OpenGL ES for iOS

160 CHAPTER 5: Textures^

m_Scale=radius;

m_Squash=squash;

colorIncrment=255/stacks;

if ((self = [super init]))

{

m_Stacks = stacks;

m_Slices = slices;

m_VertexData = nil;

m_TexCoordsData = nil;

//Vertices

GLfloat *vPtr = m_VertexData =

(GLfloat*)malloc(sizeof(GLfloat) * 3 * ((m_Slices*2+2) *«

(m_Stacks)));

//Color data

GLubyte *cPtr = m_ColorData =

(GLubyte*)malloc(sizeof(GLubyte) * 4 * ((m_Slices*2+2) *«

(m_Stacks)));

//Normal pointers for lighting

GLfloat *nPtr = m_NormalData = (GLfloat*)

malloc(sizeof(GLfloat) * 3 * ((m_Slices*2+2) * (m_Stacks)));

GLfloat *tPtr=nil; //3

if(textureFile!=nil)

{

tPtr=m_TexCoordsData =

(GLfloat *)malloc(sizeof(GLfloat) * 2 * ((m_Slices*2+2) *«

(m_Stacks)));

}

unsigned int phiIdx, thetaIdx;

//Latitude

for(phiIdx=0; phiIdx < m_Stacks; phiIdx++)

{

//Starts at -1.57 goes up to +1.57 radians.

//The first circle

float phi0 = M_PI * ((float)(phiIdx+0) * (1.0/(float)«

(m_Stacks)) - 0.5);