Add the GPU rigid body pipeline from https://github.com/erwincoumans/experiments as a Bullet 3.x preview for Bullet 2.80

Extras/RigidBodyGpuPipeline/opencl/primitives/AdlPrimitives/Math/Float2.inl

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+/*
+Copyright (c) 2012 Advanced Micro Devices, Inc.  
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+//Originally written by Takahiro Harada
+
+
+__inline
+float2 make_float2(float x, float y)
+{
+	float2 v;
+	v.s[0] = x; v.s[1] = y;
+	return v;
+}
+
+__inline
+float2 make_float2(float x)
+{
+	return make_float2(x,x);
+}
+
+__inline
+float2 make_float2(const int2& x)
+{
+	return make_float2((float)x.s[0], (float)x.s[1]);
+}
+
+
+
+
+__inline
+float2 operator-(const float2& a)
+{
+	return make_float2(-a.x, -a.y);
+}
+
+__inline
+float2 operator*(const float2& a, const float2& b)
+{
+	float2 out;
+	out.s[0] = a.s[0]*b.s[0];
+	out.s[1] = a.s[1]*b.s[1];
+	return out;
+}
+
+__inline
+float2 operator*(float a, const float2& b)
+{
+	return make_float2(a*b.s[0], a*b.s[1]);
+}
+
+__inline
+float2 operator*(const float2& b, float a)
+{
+	return make_float2(a*b.s[0], a*b.s[1]);
+}
+
+__inline
+void operator*=(float2& a, const float2& b)
+{
+	a.s[0]*=b.s[0];
+	a.s[1]*=b.s[1];
+}
+
+__inline
+void operator*=(float2& a, float b)
+{
+	a.s[0]*=b;
+	a.s[1]*=b;
+}
+
+__inline
+float2 operator/(const float2& a, const float2& b)
+{
+	float2 out;
+	out.s[0] = a.s[0]/b.s[0];
+	out.s[1] = a.s[1]/b.s[1];
+	return out;
+}
+
+__inline
+float2 operator/(const float2& b, float a)
+{
+	return make_float2(b.s[0]/a, b.s[1]/a);
+}
+
+__inline
+void operator/=(float2& a, const float2& b)
+{
+	a.s[0]/=b.s[0];
+	a.s[1]/=b.s[1];
+}
+
+__inline
+void operator/=(float2& a, float b)
+{
+	a.s[0]/=b;
+	a.s[1]/=b;
+}
+//
+
+__inline
+float2 operator+(const float2& a, const float2& b)
+{
+	float2 out;
+	out.s[0] = a.s[0]+b.s[0];
+	out.s[1] = a.s[1]+b.s[1];
+	return out;
+}
+
+__inline
+float2 operator+(const float2& a, float b)
+{
+	float2 out;
+	out.s[0] = a.s[0]+b;
+	out.s[1] = a.s[1]+b;
+	return out;
+}
+
+__inline
+float2 operator-(const float2& a, const float2& b)
+{
+	float2 out;
+	out.s[0] = a.s[0]-b.s[0];
+	out.s[1] = a.s[1]-b.s[1];
+	return out;
+}
+
+__inline
+float2 operator-(const float2& a, float b)
+{
+	float2 out;
+	out.s[0] = a.s[0]-b;
+	out.s[1] = a.s[1]-b;
+	return out;
+}
+
+__inline
+void operator+=(float2& a, const float2& b)
+{
+	a.s[0]+=b.s[0];
+	a.s[1]+=b.s[1];
+}
+
+__inline
+void operator+=(float2& a, float b)
+{
+	a.s[0]+=b;
+	a.s[1]+=b;
+}
+
+__inline
+void operator-=(float2& a, const float2& b)
+{
+	a.s[0]-=b.s[0];
+	a.s[1]-=b.s[1];
+}
+
+__inline
+void operator-=(float2& a, float b)
+{
+	a.s[0]-=b;
+	a.s[1]-=b;
+}