…DLgroup

Reference: "A static Class Member" in https://abseil.io/tips/140

BaseImporter::SearchFileHeaderForToken() expected a pointer to a non-const token list. This was probably an oversight, as nobody would realistically expect the function to change the list. Furthermore, it prevented token lists from being compiled to read-only memory, in some cases even causing the compiler to generate thread-safe initialization.

The list is now const and all callers declare their token lists static const, thus compiling them to read-only memory.

Assimp wasn't compiling on GNU/Linux

including <exception>

Use Safe Constants Idioms for ObjFileParser::DEFAULT_MATERIAL.

* Return 0.0f for empty buffer
* closes assimp#3442

Fix possible nullptr dereferencing in material parsing

Update ObjTools.h

more const in format detection

Fix Q1 MDL group frame loading, e.g. Q1 progs/flame2.mdl

- get compiant to tinyobjloader and other importers
- closes assimp#3726

Add support for normal maps, the classic way

Fix aiString length not updated in the EmbedTextures postprocess task

This hurts, but we have no control over warnings in our dependencies. For example, the latest zip library compares integer constants and there is nothing we can do about it.

Initially fixed at commit 18b147311d3a3fef348c8bb0e710d0e5ade2b158 from 2011 because this seems to be Assimp’s current version.

Initially fixed at commit d3d87d6af75b7b1d9a9c83af57cb1b35f21aa0e3 from 2021-05-10 because this seems to be Assimp’s current version.

Initially fixed at version 1.4.1 from 2020 because this seems to be Assimp’s current version.

This commit moves contrib/gtest to contrib/googletest/googletest. The googletest repository is divided into googlemock and googletest, but only the latter was included with Assimp. git submodules requires pulling the entire repo, so the path had to be adjusted.

Initially fixed at version 1.11.4 from 2020 because this seems to be Assimp’s current version.

CMake required adding the PUGIXML_HEADER_ONLY preprocessor definition, which previously was hard-coded into the header.

Bumps [contrib/utf8cpp](https://github.com/nemtrif/utfcpp) from `60c490b` to `2ad9957`.
- [Release notes](https://github.com/nemtrif/utfcpp/releases)
- [Commits](nemtrif/utfcpp@60c490b...2ad9957)

---
updated-dependencies:
- dependency-name: contrib/utf8cpp
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>