From 45b739a44aad28f1d7e4064134a6ea7d99f89bc5 Mon Sep 17 00:00:00 2001
From: Pavel Krajcevski <pavel@cs.unc.edu>
Date: Sun, 16 Feb 2014 17:17:25 -0500
Subject: [PATCH] Add some tests for VectorBase

---
 Base/include/VectorBase.h |   8 +-
 Base/test/TestVector.cpp  | 150 +++++++++++++++++++++++++++++++++++++-
 2 files changed, 152 insertions(+), 6 deletions(-)

diff --git a/Base/include/VectorBase.h b/Base/include/VectorBase.h
index 3aa2232..50f9ef1 100644
--- a/Base/include/VectorBase.h
+++ b/Base/include/VectorBase.h
@@ -61,7 +61,7 @@ namespace FasTC {
     const T &operator[](int idx) const { return vec[idx]; }
 
     // Allow casts to the respective array representation...
-    operator T *() const { return vec; }
+    operator const T *() const { return vec; }
     VectorBase<T, N> &operator=(const T *v) {
       for(int i = 0; i < N; i++)
         vec[i] = v[i];
@@ -71,7 +71,11 @@ namespace FasTC {
     // Allows casting to other vector types if the underlying type system does as well...
     template<typename _T>
     operator VectorBase<_T, N>() const { 
-      return VectorBase<_T, N>(vec); 
+      VectorBase<_T, N> ret;
+      for(int i = 0; i < N; i++) {
+        ret[i] = static_cast<_T>(vec[i]);
+      }
+      return ret;
     }
 
     // Vector operations
diff --git a/Base/test/TestVector.cpp b/Base/test/TestVector.cpp
index 9abd2e6..45c05a4 100644
--- a/Base/test/TestVector.cpp
+++ b/Base/test/TestVector.cpp
@@ -51,19 +51,20 @@
  */
 
 #include "gtest/gtest.h"
-#include "TexCompTypes.h"
 #include "VectorBase.h"
 
+static const float kEpsilon = 1e-6;
+
 TEST(VectorBase, Constructors) {
   FasTC::VectorBase<float, 3> v3f;
   FasTC::VectorBase<double, 1> v1d;
   FasTC::VectorBase<int, 7> v7i;
-  FasTC::VectorBase<uint32, 16> v16u;
+  FasTC::VectorBase<unsigned, 16> v16u;
 
 #define TEST_VECTOR_COPY_CONS(v, t, n)          \
   do {                                          \
     FasTC::VectorBase<t, n> d##v (v);           \
-    for(uint32 i = 0; i < n; i++) {             \
+    for(int i = 0; i < n; i++) {                \
       EXPECT_EQ(d##v [i], v[i]);                \
     }                                           \
   } while(0)                                    \
@@ -71,5 +72,146 @@ TEST(VectorBase, Constructors) {
   TEST_VECTOR_COPY_CONS(v3f, float, 3);
   TEST_VECTOR_COPY_CONS(v1d, double, 1);
   TEST_VECTOR_COPY_CONS(v7i, int, 7);
-  TEST_VECTOR_COPY_CONS(v16u, uint32, 16);
+  TEST_VECTOR_COPY_CONS(v16u, unsigned, 16);
+
+#undef TEST_VECTOR_COPY_CONS
+}
+
+TEST(VectorBase, Accessors) {
+  FasTC::VectorBase<float, 3> v3f;
+  v3f[0] = 1.0f;
+  v3f[1] = -2.3f;
+  v3f[2] = 1000;
+
+  for(int i = 0; i < 3; i++) {
+    EXPECT_EQ(v3f[i], v3f(i));
+  }
+
+  v3f(0) = -1.0f;
+  v3f(1) = 2.3f;
+  v3f(2) = -1000;
+
+  for(int i = 0; i < 3; i++) {
+    EXPECT_EQ(v3f(i), v3f[i]);
+  }
+}
+
+TEST(VectorBase, PointerConversion) {
+  FasTC::VectorBase<float, 3> v3f;
+  v3f[0] = 1.0f;
+  v3f[1] = -2.3f;
+  v3f[2] = 1000;
+
+  float cmp[3] = { 1.0f, -2.3f, 1000 };
+  const float *v3fp = v3f;
+  int result = memcmp(cmp, v3fp, 3 * sizeof(float));
+  EXPECT_EQ(result, 0);
+
+  cmp[0] = -1.0f;
+  cmp[1] = 2.3f;
+  cmp[2] = 1000.0f;
+  v3f = cmp;
+  for(int i = 0; i < 3; i++) {
+    EXPECT_EQ(v3f[i], cmp[i]);
+  }
+}
+
+TEST(VectorBase, CastVector) {
+  FasTC::VectorBase<float, 3> v3f;
+  FasTC::VectorBase<double, 3> v3d = v3f;
+  FasTC::VectorBase<int, 3> v3i = v3f;
+  for(int i = 0; i < 3; i++) {
+    EXPECT_EQ(v3d(i), static_cast<double>(v3f(i)));
+    EXPECT_EQ(v3i(i), static_cast<int>(v3f(i)));
+  }
+}
+
+TEST(VectorBase, DotProduct) {
+  int iv[5] = { -2, -1, 0, 1, 2 };
+  FasTC::VectorBase<int, 5> v5i(iv);
+
+  unsigned uv[5] = { 1, 2, 3, 4, 5 };
+  FasTC::VectorBase<unsigned, 5> v5u(uv);
+
+  EXPECT_EQ(v5i.Dot(v5u), 10);
+  EXPECT_EQ(v5u.Dot(v5i), 10);
+}
+
+TEST(VectorBase, Length) {
+  int iv[5] = { 1, 2, 3, 4, 5 };
+  FasTC::VectorBase<int, 5> v5i (iv);
+
+  EXPECT_EQ(v5i.LengthSq(), 55);
+  EXPECT_EQ(v5i.Length(), 7);
+
+  float fv[6] = {1, 2, 3, 4, 5, 6};
+  FasTC::VectorBase<float, 6> v6f (fv);
+  
+  EXPECT_EQ(v6f.LengthSq(), 91);
+  EXPECT_NEAR(v6f.Length(), sqrt(91.0f), kEpsilon);
+}
+
+TEST(VectorBase, Normalization) {
+  float fv[2] = {1, 0};
+  FasTC::VectorBase<float, 2> v2f (fv);
+  v2f.Normalize();
+  EXPECT_EQ(v2f[0], 1);
+  EXPECT_EQ(v2f[1], 0);
+
+  // Normalized vector should be sqrt(2) for each axis, although
+  // this can't be represented as integers...
+  unsigned uv[2] = {2, 2};
+  FasTC::VectorBase<unsigned, 2> v2u (uv);
+  v2u.Normalize();
+  EXPECT_EQ(v2u[0], 1);
+  EXPECT_EQ(v2u[1], 1);
+
+  const float sqrt2 = sqrt(2)/2.0f;
+  for(int i = 2; i < 10; i++) {
+    v2f[0] = static_cast<float>(i);
+    v2f[1] = static_cast<float>(i);
+    v2f.Normalize();
+    EXPECT_NEAR(v2f[0], sqrt2, kEpsilon);
+    EXPECT_NEAR(v2f[1], sqrt2, kEpsilon);
+  }
+}
+
+TEST(VectorBase, Scaling) {
+  float fv[2] = {1.0f, 3.0f};
+  FasTC::VectorBase<float, 2> v2f (fv);
+  FasTC::VectorBase<float, 2> v2fd = v2f * 3.0f;
+  EXPECT_NEAR(v2fd[0], 3.0f, kEpsilon);
+  EXPECT_NEAR(v2fd[1], 9.0f, kEpsilon);
+
+  v2fd = -1.0 * v2f;
+  EXPECT_NEAR(v2fd[0], -1.0f, kEpsilon);
+  EXPECT_NEAR(v2fd[1], -3.0f, kEpsilon);
+
+  v2fd = v2f / 3;
+  EXPECT_NEAR(v2fd[0], 1.0f / 3.0f, kEpsilon);
+  EXPECT_NEAR(v2fd[1], 1.0f, kEpsilon);
+}
+
+TEST(VectorBase, Addition) {
+  float fv[2] = {1.1f, 3.2f};
+  FasTC::VectorBase<float, 2> v2f (fv);
+
+  unsigned uv[2] = {5, 2};
+  FasTC::VectorBase<unsigned, 2> v2u (uv);
+
+  FasTC::VectorBase<unsigned, 2> au = v2u + v2f;
+  EXPECT_EQ(au[0], 6);
+  EXPECT_EQ(au[1], 5);
+
+  FasTC::VectorBase<float, 2> af = v2f + v2u;
+  EXPECT_NEAR(af[0], 6.1f, kEpsilon);
+  EXPECT_NEAR(af[1], 5.2f, kEpsilon);
+
+  au = v2u - v2f;
+  EXPECT_EQ(au[0], 3);
+  EXPECT_EQ(au[1], 0);
+
+  af = v2f - v2u;
+  EXPECT_NEAR(af[0], -3.9f, kEpsilon);
+  EXPECT_NEAR(af[1], 1.2f, kEpsilon);  
 }