The Fixed-Function Graphics Pipeline - Graphics Shaders - page 18

glVertexPointer( size, type, stride, array );
glColorPointer( size, type, stride, array );
glNormalPointer( type, stride, array );
glSecondaryColorPointer( size, type, stride, array );
glTexCoordPointer( size, type, stride, array );

that let you specify that an array is to be used for vertex
coordinates, colors, normals, etc. Here, size is the dimen-
sion of a vertex and can be 2, 3, or 4; type can be any of
GL_SHORT , GL_INT , GL_FLOAT , or GL_DOUBLE; and array is
the name of the corresponding data array. The variable
stride is the byte offset between consecutive entries in the
array (0 means tightly packed) and is most easily set with
the sizeof( ) function.
As an example, let's draw the standard RGB cube
whose vertices are indexed in Figure 1.11 by specifying its
vertex coordinates and vertex colors. We set vertex 0 to be
black, its adjacent vertices 1, 2, and 4 to be red, green, and
blue respectively, vertices 3, 6, and 5 to be yellow, cyan, and
magenta respectively, and vertex 7 to be black.
The following statements set up these arrays:

Figure 1.11. A cube with vertices
numbered to match the RGB cube.

static GLfloat CubeVertices[ ][3] =
{
{ -1., -1., -1. },
{ 1., -1., -1. },
{ -1., 1., -1. },
{ 1., 1., -1. },
{ -1., -1., 1. },
{ 1., -1., 1. },
{ -1., 1., 1. },
{ 1., 1., 1. }
};

static GLfloat CubeColors[ ][3] =
{
{ 0., 0., 0. },
{ 1., 0., 0. },
{ 0., 1., 0. },
{ 1., 1., 0. },
{ 0., 0., 1. },
{ 1., 0., 1. },
{ 0., 1., 1. },
{ 1., 1., 1. },
};