From 296605f3641496efeba427f91a465d036fdb7422 Mon Sep 17 00:00:00 2001
From: Eryn Wells <eryn@erynwells.me>
Date: Thu, 5 Sep 2013 22:54:45 -0700
Subject: [PATCH] Add basics module

---
 src/SConscript |  1 +
 src/basics.c   | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/basics.h   | 26 ++++++++++++++++++++++++++
 3 files changed, 75 insertions(+)
 create mode 100644 src/basics.c
 create mode 100644 src/basics.h

diff --git a/src/SConscript b/src/SConscript
index 8815e7f..3619e44 100644
--- a/src/SConscript
+++ b/src/SConscript
@@ -1,6 +1,7 @@
 Import('env')
 
 files = Split("""
+    basics.c
     charles.c
     scene.c
 """)
diff --git a/src/basics.c b/src/basics.c
new file mode 100644
index 0000000..50c3cb4
--- /dev/null
+++ b/src/basics.c
@@ -0,0 +1,48 @@
+/* basics.c
+ *
+ * Definition of basic types: Vector.
+ *
+ * Eryn Wells <eryn@erynwells.me>
+ */
+
+#include "basics.h"
+
+
+/*
+ * vector_init --
+ *
+ * Create a new vector given x, y, and z coordinates.
+ */
+Vector3
+vector_init(float x, float y, float z)
+{
+    Vector3 v;
+    v.x = x;
+    v.y = y;
+    v.z = z;
+    return v;
+}
+
+
+/*
+ * vector_mult_scalar --
+ *
+ * Multiply a vector by a scalar. Return a new vector.
+ */
+Vector3
+vector_mult_scalar(Vector3 v, float f)
+{
+    return vector_init(f * v.x, f * v.y, f * v.z);
+}
+
+
+/*
+ * vector_mult_vector --
+ *
+ * Multiply a vector by another vector. Return a new vector.
+ */
+Vector3
+vector_mult_vector(Vector3 v, Vector3 f)
+{
+    return vector_init(v.x * f.x, v.y * f.y, v.z * f.z);
+}
diff --git a/src/basics.h b/src/basics.h
new file mode 100644
index 0000000..d73c2fa
--- /dev/null
+++ b/src/basics.h
@@ -0,0 +1,26 @@
+/* basics.h
+ *
+ * Declaration of basic types: Vector.
+ *
+ * Eryn Wells <eryn@erynwells.me>
+ */
+
+
+#ifndef __BASICS_H
+#define __BASICS_H
+
+
+typedef struct {
+    float x, y, z;
+} Vector3;
+
+
+extern const Vector3 ZeroVector3;
+
+
+Vector3 vector_init(float x, float y, float z);
+Vector3 vector_mult_scalar(Vector3 v, float f);
+Vector3 vector_mult_vector(Vector3 v, Vector3 f);
+
+
+#endif