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gobj: Fix GeomPrimitive::offset_vertices() with strip cut index

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This was called, among other things, by the egg-unify process, which could ruin the strip cut index.

At the same time, I've reimplemented the indexed case for offset_vertices() to make it a little bit more efficient.

Fixes #1122
This commit is contained in:
rdb 2021-03-22 11:35:03 +01:00
parent fe29aab568
commit 40b94c1f97
1 changed files with 39 additions and 7 deletions
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46
panda/src/gobj/geomPrimitive.cxx
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@ -442,18 +442,50 @@ offset_vertices(int offset) {
consider_elevate_index_type(cdata, cdata->_max_vertex + offset);
int strip_cut_index = get_strip_cut_index(cdata->_index_type);
{
GeomVertexArrayDataHandle handle(cdata->_vertices.get_write_pointer(),
Thread::get_current_thread());
GeomVertexRewriter index(do_modify_vertices(cdata), 0);
while (!index.is_at_end()) {
int vertex = index.get_data1i();
size_t num_rows = (size_t)handle.get_num_rows();
unsigned char *ptr = handle.get_write_pointer();
switch (cdata->_index_type) {
case GeomEnums::NT_uint8:
for (size_t i = 0; i < num_rows; ++i) {
uint8_t &v = ((uint8_t *)ptr)[i];
if (v != 0xff) {
v += offset;
}
}
break;
if (vertex != strip_cut_index) {
index.set_data1i(vertex + offset);
case GeomEnums::NT_uint16:
for (size_t i = 0; i < num_rows; ++i) {
uint16_t &v = ((uint16_t *)ptr)[i];
if (v != 0xffff) {
v += offset;
}
}
break;
case GeomEnums::NT_uint32:
for (size_t i = 0; i < num_rows; ++i) {
uint32_t &v = ((uint32_t *)ptr)[i];
if (v != 0xffffffff) {
v += offset;
}
}
break;
default:
nassert_raise("unsupported index type");
break;
}
}
} else {
cdata->_modified = Geom::get_next_modified();
cdata->_got_minmax = false;
}
else {
CDWriter cdata(_cycler, true);
cdata->_first_vertex += offset;