Add support for point light and materials.

Add material to objects.

tests/material_test.cpp

@@ -0,0 +1,90 @@
+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  Material unit tests
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+#include <material.h>
+#include <math.h>
+#include <colour.h>
+#include <gtest/gtest.h>
+
+TEST(MaterialTest, The_default_material)
+{
+    Material m = Material();
+
+    ASSERT_EQ(m.colour, Colour(1, 1, 1));
+    ASSERT_EQ(m.ambient, 0.1);
+    ASSERT_EQ(m.diffuse, 0.9);
+    ASSERT_EQ(m.specular, 0.9);
+    ASSERT_EQ(m.shininess, 200.0);
+}
+
+// This is used by the next tests
+static Material m = Material();
+static Point position = Point(0, 0, 0);
+
+TEST(MaterialTest, Lighting_with_the_eye_between_the_light_and_the_surface)
+{
+    Vector eyev = Vector(0, 0, -1);
+    Vector normalv = Vector(0, 0, -1);
+    Light light = Light(POINT_LIGHT, Point(0, 0, -10), Colour(1, 1, 1));
+
+    Colour result = m.lighting(light, position, eyev, normalv);
+
+    ASSERT_EQ(result, Colour(1.9, 1.9, 1.9));
+}
+
+TEST(MaterialTest, Lighting_with_the_eye_between_the_light_and_the_surface_eye_offset_by_45)
+{
+    Vector eyev = Vector(0, -sqrt(2)/2, -sqrt(2)/2);
+    Vector normalv = Vector(0, 0, -1);
+    Light light = Light(POINT_LIGHT, Point(0, 0, -10), Colour(1, 1, 1));
+
+    Colour result = m.lighting(light, position, eyev, normalv);
+
+    ASSERT_EQ(result, Colour(1.0, 1.0, 1.0));
+}
+
+TEST(MaterialTest, Lighting_with_the_eye_opposite_surface_light_offset_45)
+{
+    Vector eyev = Vector(0, 0, -1);
+    Vector normalv = Vector(0, 0, -1);
+    Light light = Light(POINT_LIGHT, Point(0, 10, -10), Colour(1, 1, 1));
+
+    Colour result = m.lighting(light, position, eyev, normalv);
+
+    set_equal_precision(0.0001);
+
+    ASSERT_EQ(result, Colour(0.7364, 0.7364, 0.7364));
+
+    set_equal_precision(FLT_EPSILON);
+}
+
+TEST(MaterialTest, Lighting_with_the_eye_in_the_path_of_the_reflection_vector)
+{
+    Vector eyev = Vector(0, -sqrt(2)/2, -sqrt(2)/2);
+    Vector normalv = Vector(0, 0, -1);
+    Light light = Light(POINT_LIGHT, Point(0, 10, -10), Colour(1, 1, 1));
+
+    Colour result = m.lighting(light, position, eyev, normalv);
+
+    set_equal_precision(0.0001);
+
+    ASSERT_EQ(result, Colour(1.6364, 1.6364, 1.6364));
+
+    set_equal_precision(FLT_EPSILON);
+}
+
+TEST(MaterialTest, Lighting_with_the_light_behind_the_surface)
+{
+    Vector eyev = Vector(0, 0, -1);
+    Vector normalv = Vector(0, 0, -1);
+    Light light = Light(POINT_LIGHT, Point(0, 0, 10), Colour(1, 1, 1));
+
+    Colour result = m.lighting(light, position, eyev, normalv);
+
+    ASSERT_EQ(result, Colour(0.1, 0.1, 0.1));
+}