/*
* pushmatrix
*
* Push the top matrix of the stack down, placing a copy
* of it on the top of the stack.
*
*/
void
pushmatrix(void)
{
Mstack *tmpmat;
Token *p;
if (vdevice.inobject) {
p = newtokens(1);
p->i = PUSHMATRIX;
return;
}
if (msfree != (Mstack *)NULL) {
tmpmat = vdevice.transmat;
vdevice.transmat = msfree;
msfree = msfree->back;
vdevice.transmat->back = tmpmat;
copymatrix(vdevice.transmat->m, tmpmat->m);
} else {
tmpmat = (Mstack *)vallocate(sizeof(Mstack));
tmpmat->back = vdevice.transmat;
copymatrix(tmpmat->m, vdevice.transmat->m);
vdevice.transmat = tmpmat;
}
}
/*
* pushviewport
*
* pushes the current viewport on the viewport stack
*
*/
void
pushviewport()
{
Vstack *nvport;
Token *tok;
if (!vdevice.initialised)
verror("pushviewport: vogle not initialised");
if (vdevice.inobject) {
tok = newtokens(1);
tok->i = PUSHVIEWPORT;
return;
}
if (vsfree != (Vstack *)NULL) {
nvport = vdevice.viewport;
vdevice.viewport = vsfree;
vsfree = vsfree->back;
vdevice.viewport->back = nvport;
vdevice.viewport->v.left = nvport->v.left;
vdevice.viewport->v.right = nvport->v.right;
vdevice.viewport->v.bottom = nvport->v.bottom;
vdevice.viewport->v.top = nvport->v.top;
} else {
nvport = (Vstack *)vallocate(sizeof(Vstack));
nvport->back = vdevice.viewport;
nvport->v.left = vdevice.viewport->v.left;
nvport->v.right = vdevice.viewport->v.right;
nvport->v.bottom = vdevice.viewport->v.bottom;
nvport->v.top = vdevice.viewport->v.top;
vdevice.viewport = nvport;
}
}
