EsenthalEngine/ThirdPartyLibs/Bullet/Building.txt

0) Run "Clean.bat"
1) Run "build_visual_studio_without_pybullet_vr.bat"
2) Open "build3\vs2010\0_Bullet3Solution.sln"
3) Allow auto update to latest Platform Toolset
4) Select Projects "BulletCollision", "BulletDynamics", "LinearMath" and open their Properties
5) Set Platform Toolset to support Windows XP
6) General
	Output Directory - restore default
	Intermediate Directory - restore default
   C/C++
	General
		Debug Information Format - None
	Language
		Enable Run-Time Type Info - Yes
7) Create new Configuration: "Release Universal"
   Create new Platforms: Emscripten, x64, ARM
	For Release Universal ARM/Win32/x64 set:
		General \ Windows Store App Support = Yes
		General \ Platform Toolset = Visual Studio 2017 (v141) or newer
		General \ Windows SDK Version = 10...
		C/C++ \ General \ Consume Windows Runtime Extension = Yes (/ZW)
		C/C++ \ Code Generation \ Runtime Library = Multi-threaded DLL (/MD)
	For Emscripten, reset Target Extension, set Platform Toolset "emcc", remove all Clang Command Line options
8) Have to manually edit - C:\Esenthel\ThirdPartyLibs\Bullet\lib\build3\vs2010
	BulletCollision.vcxproj
	BulletDynamics.vcxproj
	LinearMath.vcxproj
	and Replace
		<WindowsAppContainer>true</WindowsAppContainer>
	with
		<WindowsAppContainer>true</WindowsAppContainer>	<AppContainerApplication>true</AppContainerApplication>
9) Apply code changes:
/******************************************************************************/
In src\BulletDynamics\ConstraintSolver\btConeTwistConstraint.h
Change
	const btTransform& getAFrame() { return m_rbAFrame; };	
	const btTransform& getBFrame() { return m_rbBFrame; };
To
	      btTransform& getAFrame()      { return m_rbAFrame; };
	      btTransform& getBFrame()      { return m_rbBFrame; };
	const btTransform& getAFrame()const { return m_rbAFrame; };
	const btTransform& getBFrame()const { return m_rbBFrame; };
/******************************************************************************/
In src\BulletDynamics\Dynamics\btRigidBody.cpp, void btRigidBody::applyDamping(btScalar timeStep)
Optionally change to match PhysX way of calculating damping

//#define USE_OLD_DAMPING_METHOD 1
#ifdef USE_OLD_DAMPING_METHOD
	m_linearVelocity *= GEN_Clamped((btScalar(1.) - timeStep * m_linearDamping), (btScalar)btScalar(0.0), (btScalar)btScalar(1.0));
	m_angularVelocity *= GEN_Clamped((btScalar(1.) - timeStep * m_angularDamping), (btScalar)btScalar(0.0), (btScalar)btScalar(1.0));
#else

To

#define USE_OLD_DAMPING_METHOD 1
#ifdef USE_OLD_DAMPING_METHOD
	m_linearVelocity *= btClamped((btScalar(1.) - timeStep * m_linearDamping), (btScalar)btScalar(0.0), (btScalar)btScalar(1.0));
	m_angularVelocity *= btClamped((btScalar(1.) - timeStep * m_angularDamping), (btScalar)btScalar(0.0), (btScalar)btScalar(1.0));
#else
/******************************************************************************/
In src\LinearMath\btScalar.h
Change
				///#define ATTRIBUTE_ALIGNED16(a) a __attribute__ ((aligned (16)))
				///#define ATTRIBUTE_ALIGNED64(a) a __attribute__ ((aligned (64)))
				///#define ATTRIBUTE_ALIGNED128(a) a __attribute__ ((aligned (128)))
				#define ATTRIBUTE_ALIGNED16(a) a
				#define ATTRIBUTE_ALIGNED64(a) a
				#define ATTRIBUTE_ALIGNED128(a) a
To
				#define ATTRIBUTE_ALIGNED16(a) a __attribute__ ((aligned (16)))
				#define ATTRIBUTE_ALIGNED64(a) a __attribute__ ((aligned (64)))
				#define ATTRIBUTE_ALIGNED128(a) a __attribute__ ((aligned (128)))
/******************************************************************************/
In btQuickprof.h
Change
//#define BT_NO_PROFILE 1

To
#define BT_NO_PROFILE 1

/******************************************************************************/
10) When building in VS, Select the projects, right click and do "Build Selection"

/******************************************************************************/
ANDROID

edit "lib\build3\Android\jni\Android.mk", add:
LOCAL_CFLAGS       += -O3 -fshort-wchar -ffast-math -funsafe-math-optimizations -fomit-frame-pointer
LOCAL_CPPFLAGS     += -O3 -fshort-wchar -ffast-math -funsafe-math-optimizations -fomit-frame-pointer
LOCAL_CPP_FEATURES := rtti
LOCAL_ARM_NEON     := true

edit "lib\build3\Android\jni\Application.mk", replace with:
APP_PLATFORM := android-18
APP_STL      := c++_static
APP_ABI      := armeabi-v7a arm64-v8a x86
APP_MODULES  := libBullet
APP_OPTIM    := release
/******************************************************************************/
MAC

Use manually generated "Mac/Bullet.xcodeproj", but:
-remove all old sources
-manually drag and drop "lib/src/BulletCollision", "lib/src/BulletDynamics", "lib/src/LinearMath" to the project
/******************************************************************************/
LINUX

Use manually generated "Linux/", but:
-remove all old sources
-manually drag and drop "lib/src/BulletCollision", "lib/src/BulletDynamics", "lib/src/LinearMath" to the project

OR

cd lib/build3
./premake4_linux64 gmake --double
cd gmake
make
/******************************************************************************/