Add support for point light and materials.

Add material to objects.

tests/CMakeLists.txt

@@ -4,7 +4,7 @@ set(THREADS_PREFER_PTHREAD_FLAG ON)
 find_package(Threads REQUIRED)
 
 set(TESTS_SRC tuple_test.cpp colour_test.cpp canvas_test.cpp matrix_test.cpp transformation_test.cpp ray_test.cpp
-        intersect_test.cpp sphere_test.cpp)
+        intersect_test.cpp sphere_test.cpp light_test.cpp material_test.cpp)
 
 add_executable(testMyRays)
 target_include_directories(testMyRays PUBLIC ${gtest_SOURCE_DIR}/include ${gtest_SOURCE_DIR})

tests/light_test.cpp

@@ -0,0 +1,24 @@
+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  Light unit tests
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+#include <light.h>
+#include <math.h>
+#include <colour.h>
+#include <tuple.h>
+#include <gtest/gtest.h>
+
+TEST(LightTest, A_point_lighthas_a_position_and_intensity)
+{
+    Colour intensity = Colour(1, 1, 1);
+    Point position = Point(0, 0, 0);
+
+    Light light = Light(POINT_LIGHT, position, intensity);
+
+    ASSERT_EQ(light.position, position);
+    ASSERT_EQ(light.intensity, intensity);
+}

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));
+}

tests/sphere_test.cpp

@@ -8,6 +8,7 @@
  */
 #include <ray.h>
 #include <sphere.h>
+#include <material.h>
 #include <transformation.h>
 #include <gtest/gtest.h>
 
@@ -177,4 +178,24 @@ TEST(SphereTest, Computing_the_normal_on_a_tranformed_sphere)
 
     /* Revert to default */
     set_equal_precision(FLT_EPSILON);
+}
+
+TEST(SphereTest, A_sphere_have_a_default_material)
+{
+    Sphere s = Sphere();
+    Material m = Material();
+
+    ASSERT_EQ(s.material, m);
+}
+
+TEST(SphereTest, A_sphere_may_be_assigned_a_material)
+{
+    Sphere s = Sphere();
+
+    Material m = Material();
+    m.ambient = 1;
+
+    s.setMaterial(m);
+
+    ASSERT_EQ(s.material, m);
 }