From 44d26b77c45668c9b0c99894a4294cec004361fe Mon Sep 17 00:00:00 2001
From: "Kartik K. Agaram" <vc@akkartik.com>
Date: Fri, 16 Jul 2021 08:09:42 -0700
Subject: .

---
 linux/apps/raytracing/ray.mu | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 linux/apps/raytracing/ray.mu

(limited to 'linux/apps/raytracing/ray.mu')

diff --git a/linux/apps/raytracing/ray.mu b/linux/apps/raytracing/ray.mu
new file mode 100644
index 00000000..20cc42e9
--- /dev/null
+++ b/linux/apps/raytracing/ray.mu
@@ -0,0 +1,24 @@
+type ray {
+  orig: vec3  # point
+  dir: vec3
+}
+
+# A little different from the constructor at https://raytracing.github.io/books/RayTracingInOneWeekend.html
+# We immediately normalize the direction vector so we don't have to keep doing
+# so.
+fn initialize-ray _self: (addr ray), o: (addr vec3), d: (addr vec3) {
+  var self/esi: (addr ray) <- copy _self
+  var dest/eax: (addr vec3) <- get self, orig
+  copy-object o, dest
+  dest <- get self, dir
+  vec3-unit d, dest
+}
+
+fn ray-at _self: (addr ray), t: float, out: (addr vec3) {
+  var self/esi: (addr ray) <- copy _self
+  var src/eax: (addr vec3) <- get self, dir
+  copy-object src, out
+  vec3-scale-up out, t
+  src <- get self, orig
+  vec3-add-to out, src
+}
-- 
cgit 1.4.1-2-gfad0