Question

I create an interleaved vertex array in c++:

struct vertex
{
    GLfloat position[3];
    GLbyte normal[3];
};
std::vector< vertex > vertices;
// fill in vertices...

I copy the array to a gl buffer:

GLuint vertsBuffer;
glBindBuffer (GL_ARRAY_BUFFER, vertsBuffer);
glBufferData (GL_ARRAY_BUFFER, vertices.size () * sizeof (vertex), vertices.data (), GL_STATIC_DRAW);

Is it possible to use glNormalPointer with interleaved data like this, for example?

glBindBuffer (GL_ARRAY_BUFFER, vertsBuffer);
glEnableClientState (GL_NORMAL_ARRAY);
glNormalPointer (GL_BYTE, sizeof (vertex), (GLvoid*) offsetof (vertex, normal));

Or do I have to use glVertexAttribPointer instead?

Answer 1

That should work fine if you use the legacy gl_Normal GLSL built-in (Section 7.3, page 49).

glVertexAttribPointer() is more forward-compatible though.