Add basics module

src/SConscript

@@ -1,6 +1,7 @@
 Import('env')
 
 files = Split("""
+    basics.c
     charles.c
     scene.c
 """)

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);
+}

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