gistfile1.c

GLfloat* createSlices(unsigned int num_slices) {
    // Each slice has 4 vertices (GL_TRIANGLE_STRIP)
    unsigned long total_verts = num_slices * 4;
    // Each vertex has 3 coordinates
    unsigned long total_elements = total_verts * 3;

    // We have 4 verts * 3 coords = 12 elements per slice
    const GLfloat one_slice[12] = {
        // x, y, z
         1.,  1., 0.,
         1., -1., 0.,
        -1., -1., 0.,
        -1.,  1., 0.,
    };

    GLfloat *slices = malloc(sizeof(GLfloat) * total_elements);
    int i;
    for (i = 0; i < num_slices; i+=12) {
        memcpy(&slices[i], one_slice, 12);
    }
    assert(i == total_elements);

    return slices;
}