OpenGL sample texture coordinates

cube_coords.c

// three xyz coordinates, three normal coordinates, two texture coordinates *
// six vertices per face * 
// six faces per cube
GLfloat gCubeVertexData[(3 + 3 + 2) * 6 * 6] =
{
    // Data layout for each line below is:
    // positionX, positionY, positionZ,     normalX, normalY, normalZ,    texCoord0S, texCoord0T,
    0.5f, -0.5f, -0.5f,        1.0f, 0.0f, 0.0f,      0.0f, 0.0f,
    0.5f, 0.5f, -0.5f,         1.0f, 0.0f, 0.0f,      1.0f, 0.0f,
    0.5f, -0.5f, 0.5f,         1.0f, 0.0f, 0.0f,      0.0f, 1.0f,
    0.5f, -0.5f, 0.5f,         1.0f, 0.0f, 0.0f,      0.0f, 1.0f,
    0.5f, 0.5f, 0.5f,          1.0f, 0.0f, 0.0f,      1.0f, 1.0f,
    0.5f, 0.5f, -0.5f,         1.0f, 0.0f, 0.0f,      1.0f, 0.0f,

    0.5f, 0.5f, -0.5f,         0.0f, 1.0f, 0.0f,      1.0f, 0.0f,
    -0.5f, 0.5f, -0.5f,        0.0f, 1.0f, 0.0f,      0.0f, 0.0f,
    0.5f, 0.5f, 0.5f,          0.0f, 1.0f, 0.0f,      1.0f, 1.0f,
    0.5f, 0.5f, 0.5f,          0.0f, 1.0f, 0.0f,      1.0f, 1.0f,
    -0.5f, 0.5f, -0.5f,        0.0f, 1.0f, 0.0f,      0.0f, 0.0f,
    -0.5f, 0.5f, 0.5f,         0.0f, 1.0f, 0.0f,      0.0f, 1.0f,

    -0.5f, 0.5f, -0.5f,        -1.0f, 0.0f, 0.0f,     1.0f, 0.0f,
    -0.5f, -0.5f, -0.5f,       -1.0f, 0.0f, 0.0f,     0.0f, 0.0f,
    -0.5f, 0.5f, 0.5f,         -1.0f, 0.0f, 0.0f,     1.0f, 1.0f,
    -0.5f, 0.5f, 0.5f,         -1.0f, 0.0f, 0.0f,     1.0f, 1.0f,
    -0.5f, -0.5f, -0.5f,       -1.0f, 0.0f, 0.0f,     0.0f, 0.0f,
    -0.5f, -0.5f, 0.5f,        -1.0f, 0.0f, 0.0f,     0.0f, 1.0f,

    -0.5f, -0.5f, -0.5f,       0.0f, -1.0f, 0.0f,     0.0f, 0.0f,
    0.5f, -0.5f, -0.5f,        0.0f, -1.0f, 0.0f,     1.0f, 0.0f,
    -0.5f, -0.5f, 0.5f,        0.0f, -1.0f, 0.0f,     0.0f, 1.0f,
    -0.5f, -0.5f, 0.5f,        0.0f, -1.0f, 0.0f,     0.0f, 1.0f,
    0.5f, -0.5f, -0.5f,        0.0f, -1.0f, 0.0f,     1.0f, 0.0f,
    0.5f, -0.5f, 0.5f,         0.0f, -1.0f, 0.0f,     1.0f, 1.0f,

    0.5f, 0.5f, 0.5f,          0.0f, 0.0f, 1.0f,      1.0f, 1.0f,
    -0.5f, 0.5f, 0.5f,         0.0f, 0.0f, 1.0f,      0.0f, 1.0f,
    0.5f, -0.5f, 0.5f,         0.0f, 0.0f, 1.0f,      1.0f, 0.0f,
    0.5f, -0.5f, 0.5f,         0.0f, 0.0f, 1.0f,      1.0f, 0.0f,
    -0.5f, 0.5f, 0.5f,         0.0f, 0.0f, 1.0f,      0.0f, 1.0f,
    -0.5f, -0.5f, 0.5f,        0.0f, 0.0f, 1.0f,      0.0f, 0.0f,

    0.5f, -0.5f, -0.5f,        0.0f, 0.0f, -1.0f,     1.0f, 0.0f,
    -0.5f, -0.5f, -0.5f,       0.0f, 0.0f, -1.0f,     0.0f, 0.0f,
    0.5f, 0.5f, -0.5f,         0.0f, 0.0f, -1.0f,     1.0f, 1.0f,
    0.5f, 0.5f, -0.5f,         0.0f, 0.0f, -1.0f,     1.0f, 1.0f,
    -0.5f, -0.5f, -0.5f,       0.0f, 0.0f, -1.0f,     0.0f, 0.0f,
    -0.5f, 0.5f, -0.5f,        0.0f, 0.0f, -1.0f,     0.0f, 1.0f,
};

If enable glEnable(GL_CULL_FACE); then second triangle will be culled because of the incorrect vertex order. To fix it you should replace lines 11, 12 and 13 with this:

    0.5f, 0.5f, -0.5f,         1.0f, 0.0f, 0.0f,      1.0f, 0.0f,
    0.5f, 0.5f, 0.5f,          1.0f, 0.0f, 0.0f,      1.0f, 1.0f,
    0.5f, -0.5f, 0.5f,         1.0f, 0.0f, 0.0f,      0.0f, 1.0f,