geom/ellipse: add ray distance tests

CMakeLists.txt

@@ -492,8 +492,9 @@ if (TESTS)
         float
         format
         geom/aabb
-        geom/ray
+        geom/ellipse
         geom/frustum
+        geom/ray
         geom/sphere
         hash/checksum
         hash/crc

test/geom/ellipse.cpp

@@ -0,0 +1,40 @@
+#include "tap.hpp"
+
+#include "geom/ellipse.hpp"
+#include "geom/ray.hpp"
+#include "point.hpp"
+#include "vector.hpp"
+
+int
+main ()
+{
+    util::TAP::logger tap;
+
+    static struct {
+        util::geom::ellipse3f shape;
+        util::geom::ray3f caster;
+        float distance;
+        const char *message;
+    } const TESTS[] = {
+        {
+            .shape  = { .origin = {0}, .radius = {1}, .up = {0,1,0} },
+            .caster = { .origin = { 0, 0, -2 }, .direction = util::vector3f{ 0, 0, 1 } },
+            .distance = 1,
+            .message = "sphere on origin, ray mostly on origin"
+        },
+
+        {
+            .shape = { .origin = {0}, .radius = {1,1,1.5}, .up = {0,1,0} },
+            .caster = { .origin = {0,0,-2}, .direction = util::vector3f{0,0,1} },
+            .distance = .5f,
+            .message = "ellipse on origin, extended on z, ray along z",
+        },
+    };
+
+
+    for (auto const& t: TESTS) {
+        tap.expect_eq (t.distance, distance (t.caster, t.shape), "%s", t.message);
+    }
+
+    return tap.status ();
+}