Bullet required an update so that it would build again

Engine/lib/bullet/.ci/docker/env.list

@@ -0,0 +1,7 @@
+TRAVIS_OS_NAME
+TRAVIS_PULL_REQUEST
+
+BUILD_NAME
+CC
+CXX
+SUDO

Engine/lib/bullet/.ci/docker/ubuntu-bionic

@@ -0,0 +1,19 @@
+FROM ubuntu:bionic
+
+RUN apt-get update -qq
+RUN apt-get install -y \
+    build-essential  \
+    clang \
+    cmake \
+    curl \
+    git \
+    libgl-dev \
+    libglu-dev \
+    libpython3-dev \
+    lsb-release \
+    pkg-config \
+    python3 \
+    python3-dev \
+    python3-distutils \
+    software-properties-common \
+    sudo

Engine/lib/bullet/.ci/docker/ubuntu-xenial

@@ -0,0 +1,18 @@
+FROM ubuntu:xenial
+
+RUN apt-get update -qq
+RUN apt-get install -y \
+    build-essential  \
+    clang \
+    cmake \
+    curl \
+    git \
+    libgl-dev \
+    libglu-dev \
+    libpython3-dev \
+    lsb-release \
+    pkg-config \
+    python3 \
+    python3-dev \
+    software-properties-common \
+    sudo

Engine/lib/bullet/.ci/script.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+set -ex
+
+echo "CXX="$CXX
+echo "CC="$CC
+if [[ "$TRAVIS_OS_NAME" == "linux" && "$CXX" = "g++" ]]; then
+  $SUDO apt-get update
+  $SUDO apt-get install -y python3
+  $SUDO apt-get install -y python3-pip
+  $SUDO apt-get install python3-dev
+  $SUDO pip3 install -U wheel
+  $SUDO pip3 install -U setuptools
+  python3 setup.py install --user
+  python3 examples/pybullet/unittests/unittests.py --verbose
+  python3 examples/pybullet/unittests/userDataTest.py --verbose
+  python3 examples/pybullet/unittests/saveRestoreStateTest.py --verbose
+fi
+cmake . -DBUILD_PYBULLET=ON -G"Unix Makefiles" #-DCMAKE_CXX_FLAGS=-Werror
+make -j8
+ctest -j8 --output-on-failure
+
+# Build again with double precision
+cmake . -G "Unix Makefiles" -DUSE_DOUBLE_PRECISION=ON #-DCMAKE_CXX_FLAGS=-Werror
+make -j8
+ctest -j8 --output-on-failure
+
+# Build again with shared libraries
+cmake . -G "Unix Makefiles" -DBUILD_SHARED_LIBS=ON
+make -j8
+ctest -j8 --output-on-failure
+$SUDO make install

Engine/lib/bullet/.github/workflows/cmake.yml

@@ -0,0 +1,38 @@
+name: CMake
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+env:
+  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
+  BUILD_TYPE: Release
+
+jobs:
+  build:
+    # The CMake configure and build commands are platform agnostic and should work equally
+    # well on Windows or Mac.  You can convert this to a matrix build if you need
+    # cross-platform coverage.
+    # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Configure CMake
+      # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
+      # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
+
+    - name: Build
+      # Build your program with the given configuration
+      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
+
+    - name: Test
+      working-directory: ${{github.workspace}}/build
+      # Execute tests defined by the CMake configuration.  
+      # See https://cmake.org/cmake/help/latest/manual/ctest.1.html for more detail
+      run: ctest -C ${{env.BUILD_TYPE}}
+

Engine/lib/bullet/.gitignore

@@ -0,0 +1,42 @@
+/bin
+/build3/gmake
+/build3/vs2010
+/build_cmake/
+
+*.pyc
+
+# Python
+__pycache__/
+*.py[cod]
+
+# Pip
+pip-selfcheck.json
+*.whl
+*.egg
+*.egg-info
+
+# Setuptools
+/build
+/dist
+*.eggs
+
+# CMake
+CMakeFiles/
+CMakeCache.txt
+cmake_install.cmake
+CTestTestFile.cmake
+
+# Visual Studio build files
+*.vcxproj
+*.vcxproj.filters
+*.sln
+
+# Apple Finder metadata
+*.DS_Store
+
+# vim temp files
+*.swp
+
+.vscode/
+.idea/
+cmake-build-debug/

Engine/lib/bullet/.style.yapf

@@ -0,0 +1,5 @@
+[style]
+based_on_style = google
+column_limit = 99
+indent_width = 2
+

Engine/lib/bullet/AUTHORS.txt

@@ -2,24 +2,29 @@ Bullet Physics is created by Erwin Coumans with contributions from the following
 
 AMD
 Apple
+Yunfei Bai
 Steve Baker
 Gino van den Bergen
+Jeff Bingham
 Nicola Candussi
 Erin Catto
 Lawrence Chai
 Erwin Coumans
-Christer Ericson
 Disney Animation
+Benjamin Ellenberger
+Christer Ericson
 Google
 Dirk Gregorius
 Marcus Hennix
+Jasmine Hsu
 MBSim Development Team
 Takahiro Harada
 Simon Hobbs
 John Hsu
 Ole Kniemeyer
 Jay Lee
 Francisco Leon
+lunkhound
 Vsevolod Klementjev
 Phil Knight
 John McCutchan
@@ -32,9 +37,9 @@ Russel Smith
 Sony
 Jakub Stephien
 Marten Svanfeldt
+Jie Tan
 Pierre Terdiman
 Steven Thompson
 Tamas Umenhoffer
-Yunfei Bai
 
 If your name is missing, please send an email to erwin.coumans@gmail.com or file an issue at http://github.com/bulletphysics/bullet3