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e3d deserialization: ensure that vertex & index arrays always load starting from correct offset

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Wls50
2025-12-02 20:43:30 +01:00
committed by Hirek
parent bc78a3acb1
commit de4918f7a8
1 changed files with 27 additions and 2 deletions
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29
Model3d.cpp
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@@ -1866,7 +1866,8 @@ void TModel3d::deserialize(std::istream &s, size_t size, bool dynamic)
{
uint32_t type = sn_utils::ld_uint32(s);
uint32_t size = sn_utils::ld_uint32(s) - 8;
std::streampos end = s.tellg() + (std::streampos)size;
size_t pos = s.tellg();
std::streampos end = pos + (std::streampos)size;
if ((type & 0x00FFFFFF) == MAKE_ID4('S', 'U', 'B', 0)) // submodels
{
@@ -1877,7 +1878,6 @@ void TModel3d::deserialize(std::istream &s, size_t size, bool dynamic)
size_t sm_cnt = size / sm_size;
iSubModelsCount = (int)sm_cnt;
Root = new TSubModel[sm_cnt];
size_t pos = s.tellg();
for (size_t i = 0; i < sm_cnt; ++i)
{
s.seekg(pos + sm_size * i);
@@ -1906,7 +1906,31 @@ void TModel3d::deserialize(std::istream &s, size_t size, bool dynamic)
size_t const vertextype { ( ( ( type & 0xFF000000 ) >> 24 ) - '0' ) };
hastangents = ( (vertextype & 3) > 0 );
hasuserdata = (vertextype & 4);
size_t vertex_size = 0;
switch (vertextype & 3)
{
case 0:
case 2:
{
vertex_size = 8;
if(hastangents)
vertex_size += 4;
if(hasuserdata)
vertex_size += 4;
break;
}
case 1:
{
vertex_size = 4;
if(hastangents)
vertex_size += 1;
if (hasuserdata)
vertex_size += 2;
break;
}
}
for( auto const &submodeloffset : submodeloffsets ) {
s.seekg(pos + submodeloffset.first * vertex_size * sizeof(float)); // Ensure that we start reading from the correct offset even if geometry is not encoded contiguously
auto &submodel { Root[ submodeloffset.second ] };
auto const &submodelgeometry { submodel.m_geometry };
submodel.Vertices.resize( submodelgeometry.vertex_count );
@@ -1978,6 +2002,7 @@ void TModel3d::deserialize(std::istream &s, size_t size, bool dynamic)
// once sorted we can grab indices in a continuous read, and assign them to the chunks they belong to
size_t const indexsize { ( ( ( type & 0xFF000000 ) >> 24 ) - '0' ) };
for( auto const &submodeloffset : submodeloffsets ) {
s.seekg(pos + submodeloffset.first * indexsize);
auto &submodel { Root[ submodeloffset.second ] };
auto const &submodelgeometry { submodel.m_geometry };
submodel.Indices.resize( submodelgeometry.index_count );