Pro OpenGL ES for iOS

164 CHAPTER 5: Textures^

Figure 5-21. Textures typically fill out the entire frame, edge to edge. Planets use a Mercator projection (a

cylindrical map).

When you’ve found a suitable image, add it to your project and hand it off to the planet

object when allocated back in your solar system’s controller. Because you don’t need a

texture for the sun, you can just pass a nil pointer. And of course we’ll need to update

the execute() method, as shown in Listing 5-7.

Listing 5-7. Ready to handle the new texture

-(bool)execute

{

glMatrixMode(GL_MODELVIEW);

glEnable(GL_CULL_FACE);

glCullFace(GL_BACK);

glFrontFace(GL_CW);

glEnableClientState(GL_NORMAL_ARRAY);

glEnableClientState(GL_VERTEX_ARRAY);

glEnableClientState(GL_COLOR_ARRAY);

if(m_TexCoordsData!=nil)

{

glEnable(GL_TEXTURE_2D);

glEnableClientState(GL_TEXTURE_COORD_ARRAY);

if(m_TextureInfo!=0)

glBindTexture(GL_TEXTURE_2D, m_TextureInfo.name);

glTexCoordPointer(2, GL_FLOAT, 0, m_TexCoordsData);

}

glMatrixMode(GL_MODELVIEW);

glVertexPointer(3, GL_FLOAT, 0, m_VertexData);

glNormalPointer(GL_FLOAT, 0, m_NormalData);