Add vec3::refract<Enable_TIR>, vec3::valid, float-point validity assertion in vec3 operations, and tests.

1 files changed, 18 insertions, 5 deletions

diff --git a/test_vec.cpp b/test_vec.cpp
index 143d5b3..9739160 100644
--- a/test_vec.cpp
+++ b/test_vec.cpp
@@ -77,18 +77,18 @@ TEST(Vec, Mod2) {
 }
 
 TEST(Vec, IsZero) {
-    vec3i a{1,0,0}, b{0,-1,0}, c{1,2,3};
+    vec3i a{1, 0, 0}, b{0, -1, 0}, c{1, 2, 3};
     ASSERT_FALSE(a.is_zero());
     ASSERT_FALSE(b.is_zero());
     ASSERT_FALSE(c.is_zero());
 
-    vec3d d{0.1,0,0}, e{0,-0.1,0},f{0.1,0.1,0.1};
+    vec3d d{0.1, 0, 0}, e{0, -0.1, 0}, f{0.1, 0.1, 0.1};
     ASSERT_FALSE(d.is_zero());
     ASSERT_FALSE(e.is_zero());
     ASSERT_FALSE(f.is_zero());
 
-    vec3i g{0,0,0};
-    vec3d h{0,0,0}, i{1e-10,0,0}, j{1e-10,1e-10,1e-10};
+    vec3i g{0, 0, 0};
+    vec3d h{0, 0, 0}, i{1e-10, 0, 0}, j{1e-10, 1e-10, 1e-10};
     ASSERT_TRUE(g.is_zero());
     ASSERT_TRUE(h.is_zero());
     ASSERT_TRUE(i.is_zero());
@@ -96,6 +96,19 @@ TEST(Vec, IsZero) {
 }
 
 TEST(Vec, Reflect) {
-    vec3d n{1,0,0}, u{-1,1.1,0}, v{1,1.1,0};
+    vec3d n{1, 0, 0}, u{-1, 1.1, 0}, v{1, 1.1, 0};
     ASSERT_EQ(v, n.reflect(u));
+}
+
+TEST(Vec, Refract) {
+    vec3d n{1, 0, 0}, u{-1, 0, -1}, v{-sqrt(14), 0, -sqrt(2)};
+    ASSERT_EQ(u.unit_vec(), n.refract<true>(u.unit_vec(), 1).unit_vec());
+    ASSERT_EQ(u.unit_vec(), n.refract<false>(u.unit_vec(), 1).unit_vec());
+    ASSERT_EQ(v.unit_vec(), n.refract<true>(u.unit_vec(), 0.5).unit_vec());
+    ASSERT_EQ(v.unit_vec(), n.refract<false>(u.unit_vec(), 0.5).unit_vec());
+}
+
+TEST(Vec, Refract_TIR) {
+    vec3d n{1, 0, 0}, u{-1, 0, -sqrt(3)}, v{1, 0, -sqrt(3)};
+    ASSERT_EQ(v.unit_vec(), n.refract<true>(u.unit_vec(), 2));
 }
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