Matrix functions having no effect?

[kazade]

For some reason I can't get any of the mat_trans functions to affect the output...

Code: Select all

    vout.x = (float) *(ptr++);
    vout.y = (float) *(ptr++);
    vout.z = (float) (VERTEX_POINTER.size > 2) ? *(ptr++) : 0;

    mat_load(&MODELVIEW_STACK.top().m);
    mat_trans_single3_nodiv(vout.x, vout.y, vout.z);

    printf("%f %f %f\n", MODELVIEW_STACK.top().m[3][0], MODELVIEW_STACK.top().m[3][1], MODELVIEW_STACK.top().m[3][2]);
    printf("%f %f %f\n", vout.x, vout.y, vout.z);

The first statement here prints: -1.500000 0.000000 -6.000000 (the rest of the matrix is identity).

But the output is the same as the input... any ideas?

[nymus]

My first thought was it might be undefined behaviour because of the *(ptr++) inside the >? : but it works so...