1 files changed, 170 insertions, 0 deletions
diff --git a/extern/bullet2/src/LinearMath/btReducedVector.cpp b/extern/bullet2/src/LinearMath/btReducedVector.cpp
new file mode 100644
index 00000000000..1539584e7ec
--- /dev/null
+++ b/extern/bullet2/src/LinearMath/btReducedVector.cpp
@@ -0,0 +1,170 @@
+//
+//  btReducedVector.cpp
+//  LinearMath
+//
+//  Created by Xuchen Han on 4/4/20.
+//
+#include <stdio.h>
+#include "btReducedVector.h"
+#include <cmath>
+
+// returns the projection of this onto other
+btReducedVector btReducedVector::proj(const btReducedVector& other) const
+{
+    btReducedVector ret(m_sz);
+    btScalar other_length2 = other.length2();
+    if (other_length2 < SIMD_EPSILON)
+    {
+        return ret;
+    }
+    return other*(this->dot(other))/other_length2;
+}
+
+void btReducedVector::normalize()
+{
+    if (this->length2() < SIMD_EPSILON)
+    {
+        m_indices.clear();
+        m_vecs.clear();
+        return;
+    }
+    *this /= std::sqrt(this->length2());
+}
+
+bool btReducedVector::testAdd() const
+{
+    int sz = 5;
+    btAlignedObjectArray<int> id1;
+    id1.push_back(1);
+    id1.push_back(3);
+    btAlignedObjectArray<btVector3> v1;
+    v1.push_back(btVector3(1,0,1));
+    v1.push_back(btVector3(3,1,5));
+    btAlignedObjectArray<int> id2;
+    id2.push_back(2);
+    id2.push_back(3);
+    id2.push_back(5);
+    btAlignedObjectArray<btVector3> v2;
+    v2.push_back(btVector3(2,3,1));
+    v2.push_back(btVector3(3,4,9));
+    v2.push_back(btVector3(0,4,0));
+    btAlignedObjectArray<int> id3;
+    id3.push_back(1);
+    id3.push_back(2);
+    id3.push_back(3);
+    id3.push_back(5);
+    btAlignedObjectArray<btVector3> v3;
+    v3.push_back(btVector3(1,0,1));
+    v3.push_back(btVector3(2,3,1));
+    v3.push_back(btVector3(6,5,14));
+    v3.push_back(btVector3(0,4,0));
+    btReducedVector rv1(sz, id1, v1);
+    btReducedVector rv2(sz, id2, v2);
+    btReducedVector ans(sz, id3, v3);
+    bool ret = ((ans == rv1+rv2) && (ans == rv2+rv1));
+    if (!ret)
+        printf("btReducedVector testAdd failed\n");
+    return ret;
+}
+
+bool btReducedVector::testMinus() const
+{
+    int sz = 5;
+    btAlignedObjectArray<int> id1;
+    id1.push_back(1);
+    id1.push_back(3);
+    btAlignedObjectArray<btVector3> v1;
+    v1.push_back(btVector3(1,0,1));
+    v1.push_back(btVector3(3,1,5));
+    btAlignedObjectArray<int> id2;
+    id2.push_back(2);
+    id2.push_back(3);
+    id2.push_back(5);
+    btAlignedObjectArray<btVector3> v2;
+    v2.push_back(btVector3(2,3,1));
+    v2.push_back(btVector3(3,4,9));
+    v2.push_back(btVector3(0,4,0));
+    btAlignedObjectArray<int> id3;
+    id3.push_back(1);
+    id3.push_back(2);
+    id3.push_back(3);
+    id3.push_back(5);
+    btAlignedObjectArray<btVector3> v3;
+    v3.push_back(btVector3(-1,-0,-1));
+    v3.push_back(btVector3(2,3,1));
+    v3.push_back(btVector3(0,3,4));
+    v3.push_back(btVector3(0,4,0));
+    btReducedVector rv1(sz, id1, v1);
+    btReducedVector rv2(sz, id2, v2);
+    btReducedVector ans(sz, id3, v3);
+    bool ret = (ans == rv2-rv1);
+    if (!ret)
+        printf("btReducedVector testMinus failed\n");
+    return ret;
+}
+
+bool btReducedVector::testDot() const
+{
+    int sz = 5;
+    btAlignedObjectArray<int> id1;
+    id1.push_back(1);
+    id1.push_back(3);
+    btAlignedObjectArray<btVector3> v1;
+    v1.push_back(btVector3(1,0,1));
+    v1.push_back(btVector3(3,1,5));
+    btAlignedObjectArray<int> id2;
+    id2.push_back(2);
+    id2.push_back(3);
+    id2.push_back(5);
+    btAlignedObjectArray<btVector3> v2;
+    v2.push_back(btVector3(2,3,1));
+    v2.push_back(btVector3(3,4,9));
+    v2.push_back(btVector3(0,4,0));
+    btReducedVector rv1(sz, id1, v1);
+    btReducedVector rv2(sz, id2, v2);
+    btScalar ans = 58;
+    bool ret = (ans == rv2.dot(rv1) && ans == rv1.dot(rv2));
+    ans = 14+16+9+16+81;
+    ret &= (ans==rv2.dot(rv2));
+    
+    if (!ret)
+        printf("btReducedVector testDot failed\n");
+    return ret;
+}
+
+bool btReducedVector::testMultiply() const
+{
+    int sz = 5;
+    btAlignedObjectArray<int> id1;
+    id1.push_back(1);
+    id1.push_back(3);
+    btAlignedObjectArray<btVector3> v1;
+    v1.push_back(btVector3(1,0,1));
+    v1.push_back(btVector3(3,1,5));
+    btScalar s = 2;
+    btReducedVector rv1(sz, id1, v1);
+    btAlignedObjectArray<int> id2;
+    id2.push_back(1);
+    id2.push_back(3);
+    btAlignedObjectArray<btVector3> v2;
+    v2.push_back(btVector3(2,0,2));
+    v2.push_back(btVector3(6,2,10));
+    btReducedVector ans(sz, id2, v2);
+    bool ret = (ans == rv1*s);
+    if (!ret)
+        printf("btReducedVector testMultiply failed\n");
+    return ret;
+}
+
+void btReducedVector::test() const
+{
+    bool ans = testAdd() && testMinus() && testDot() && testMultiply();
+    if (ans)
+    {
+        printf("All tests passed\n");
+    }
+    else
+    {
+        printf("Tests failed\n");
+    }
+}