Convert basics to C++

src/SConscript

@@ -5,12 +5,7 @@
 Import('env')
 
 files = Split("""
-    basics.c
-    camera.c
-    object.c
-    scene.c
-    texture.c
-    writer_png.c
+    basics.cpp
 """)
 
 lib = env.Library('charles', files)

src/basics.c

@@ -1,178 +0,0 @@
-/* basics.c
- *
- * Definition of basic types: Vector.
- *
- * Eryn Wells <eryn@erynwells.me>
- */
-
-#include <math.h>
-#include "basics.h"
-
-
-const Vector3 Vector3Zero = {0.0, 0.0, 0.0};
-
-const Color ColorBlack = {0, 0, 0, 0};
-
-
-/*
- * 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_add_vector
- *
- * Add a vector to another vector. Return a new vector.
- */
-Vector3
-vector_add_vector(Vector3 v, Vector3 a)
-{
-    return vector_init(v.x + a.x, v.y + a.y, v.z + a.z);
-}
-
-
-/*
- * vector_mul_scalar --
- *
- * Multiply a vector by a scalar. Return a new vector.
- */
-Vector3
-vector_mul_scalar(Vector3 v, float f)
-{
-    return vector_init(f * v.x, f * v.y, f * v.z);
-}
-
-
-/*
- * vector_sub_vector --
- *
- * m - s. Return a new vector.
- */
-Vector3
-vector_sub_vector(Vector3 m, Vector3 s)
-{
-    return vector_init(m.x - s.x, m.y - s.y, m.z - s.z);
-}
-
-
-/*
- * vector_negate --
- *
- * Negate a vector. Return a new vector.
- */
-Vector3
-vector_negate(Vector3 v)
-{
-    return vector_init(-v.x, -v.y, -v.z);
-}
-
-
-/*
- * vector_length2 --
- *
- * Return the length-squared of the given vector.
- */
-float
-vector_length2(Vector3 v)
-{
-    return (v.x * v.x) + (v.y * v.y) + (v.z * v.z);
-}
-
-
-/*
- * vector_length --
- *
- * Return the length of the given vector.
- */
-float
-vector_length(Vector3 v)
-{
-    return sqrtf(vector_length2(v));
-}
-
-
-/*
- * vector_dot --
- *
- * Compute the dot product of v and f.
- */
-float
-vector_dot(Vector3 v, Vector3 f)
-{
-    return (v.x * f.x) + (v.y * f.y) + (v.z * f.z);
-}
-
-
-/*
- * vector_normalize --
- *
- * Normalize the given vector. Return a new vector.
- */
-Vector3
-vector_normalize(Vector3 v)
-{
-    float length2 = vector_length2(v);
-    if (length2 <= 0.0) {
-        return v;
-    }
-
-    // Multiplying by the inverse of the length is more efficient than dividing by the length.
-    float inverse_length = 1.0 / sqrtf(length2);
-    return vector_init(v.x * inverse_length, v.y * inverse_length, v.z * inverse_length);
-}
-
-/*
- * Rects
- */
-
-/*
- * rect_init --
- *
- * Create a new Rect given x, y coordinates, height, and width.
- */
-Rect
-rect_init(float x, float y, float w, float h)
-{
-    Rect r;
-    r.x = x;
-    r.y = y;
-    r.h = h;
-    r.w = w;
-    return r;
-}
-
-/*
- * Rays
- */
-
-/*
- * ray_init --
- *
- * Create a new Ray.
- */
-Ray
-ray_init(Vector3 location, Vector3 direction)
-{
-    Ray r;
-    r.location = location;
-    r.direction = direction;
-    return r;
-}
-
-
-Vector3
-ray_parameterize(Ray ray, float t)
-{
-    return vector_add_vector(ray.location, vector_mul_scalar(ray.direction, t));
-}

src/basics.cpp

@@ -0,0 +1,133 @@
+/* basics.c
+ *
+ * Definition of basic types: Vector.
+ *
+ * Eryn Wells <eryn@erynwells.me>
+ */
+
+#include <cmath>
+#include "basics.h"
+
+
+#pragma mark - Vectors
+
+const Vector3 Vector3::Zero = Vector3();
+
+
+Vector3::Vector3()
+    : Vector3(0.0, 0.0, 0.0)
+{ }
+
+
+Vector3::Vector3(float _x, float _y, float _z)
+    : x(_x), y(_y), z(_z)
+{ }
+
+
+inline Vector3
+Vector3::operator+(Vector3 v)
+{
+    return Vector3(x + v.x, y + v.y, z + v.z);
+}
+
+
+inline Vector3
+Vector3::operator*(float a)
+{
+    return Vector3(a*x, a*y, a*z);
+}
+
+
+inline Vector3
+Vector3::operator-(Vector3 v)
+{
+    return Vector3(x - v.x, y - v.y, z - v.z);
+}
+
+
+inline Vector3
+Vector3::operator-()
+{
+    return Vector3(-x, -y, -z);
+}
+
+
+inline float
+Vector3::length2()
+{
+    return x*x + y*y + z*z;
+}
+
+
+inline float
+Vector3::length()
+{
+    return sqrtf(length2());
+}
+
+
+inline float
+Vector3::dot(Vector3 v)
+{
+    return x*v.x + y*v.x + z*v.z;
+}
+
+
+void
+Vector3::normalize()
+{
+    float len2 = length2();
+    if (len2 <= 0.0) {
+        return;
+    }
+
+    // Multiplying by the inverse of the length is more efficient than dividing by the length.
+    float inverse_length = 1.0 / sqrtf(len2);
+    x *= inverse_length;
+    y *= inverse_length;
+    z *= inverse_length;
+}
+
+
+Vector3
+operator*(float a, Vector3 v)
+{
+    return v * a;
+}
+
+
+#pragma mark - Rays
+
+Ray::Ray()
+    : Ray(Vector3::Zero, Vector3::Zero)
+{ }
+
+
+Ray::Ray(Vector3 o, Vector3 d)
+    : origin(o), direction(d)
+{ }
+
+
+Vector3
+Ray::parameterize(float t)
+{
+    return origin + t * direction;
+}
+
+#pragma mark - Colors
+
+const Color Color::Black  = Color();
+const Color Color::White  = Color(1.0, 1.0, 1.0, 1.0);
+const Color Color::Red    = Color(1.0, 0.0, 0.0, 1.0);
+const Color Color::Green  = Color(0.0, 1.0, 0.0, 1.0);
+const Color Color::Blue   = Color(0.0, 0.0, 1.0, 1.0);
+
+
+Color::Color()
+    : Color(0.0, 0.0, 0.0, 0.0)
+{ }
+
+
+Color::Color(float r, float g, float b, float a)
+    : red(r), green(g), blue(b), alpha(a)
+{ }

src/basics.h

@@ -5,55 +5,55 @@
  * Eryn Wells <eryn@erynwells.me>
  */
 
-
 #ifndef __BASICS_H
 #define __BASICS_H
 
-#include <stdint.h>
+struct Vector3
+{
+    Vector3();
+    Vector3(float x, float y, float z);
 
+    Vector3 operator+(Vector3 v);
+    Vector3 operator*(float a);
+    Vector3 operator-(Vector3 v);
+    Vector3 operator-();
 
-typedef struct {
+    float length2();
+    float length();
+    float dot(Vector3 v);
+
+    void normalize();
+
+    static const Vector3 Zero;
     float x, y, z;
-} Vector3;
+};
+
+Vector3 operator*(float a, Vector3 v);
 
 
-extern const Vector3 Vector3Zero;
+struct Ray
+{
+    Ray();
+    Ray(Vector3 o, Vector3 d);
+
+    Vector3 parameterize(float t);
+
+    Vector3 origin, direction;
+};
 
 
-Vector3 vector_init(float x, float y, float z);
-Vector3 vector_add_vector(Vector3 v, Vector3 a);
-Vector3 vector_mul_scalar(Vector3 v, float f);
-Vector3 vector_sub_vector(Vector3 m, Vector3 s);
-Vector3 vector_negate(Vector3 v);
-float vector_length2(Vector3 v);
-float vector_length(Vector3 v);
-float vector_dot(Vector3 v, Vector3 f);
+struct Color
+{
+    Color();
+    Color(float r, float g, float b, float a);
 
-Vector3 vector_normalize(Vector3 v);
-
-
-typedef struct {
-    float x, y;
-    float w, h;
-} Rect;
-
-Rect rect_init(float x, float y, float h, float w);
-
-
-typedef struct {
-    Vector3 location;
-    Vector3 direction;
-} Ray;
-
-Ray ray_init(Vector3 location, Vector3 direction);
-Vector3 ray_parameterize(Ray ray, float t);
-
-
-typedef struct {
-    uint8_t red, green, blue, alpha;
-} Color;
-
-extern const Color ColorBlack;
+    static const Color Black;
+    static const Color White;
+    static const Color Red;
+    static const Color Green;
+    static const Color Blue;
 
+    float red, green, blue, alpha;
+};
 
 #endif