Adding support for pattern.

Still a bit more work to be done there.

tests/pattern_test.cpp

@@ -0,0 +1,177 @@
+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  Pattern unit tests
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+
+#include <pattern.h>
+#include <strippattern.h>
+#include <gradientpattern.h>
+#include <ringpattern.h>
+#include <testpattern.h>
+#include <transformation.h>
+#include <colour.h>
+#include <sphere.h>
+#include <gtest/gtest.h>
+#include <material.h>
+
+Colour black = Colour(0, 0, 0);
+Colour white = Colour(1, 1, 1);
+
+TEST(PatternTest, Creating_a_stripe_pattern)
+{
+    StripPattern p = StripPattern(white, black);
+
+    ASSERT_EQ(p.a, white);
+    ASSERT_EQ(p.b, black);
+}
+
+TEST(PatternTest, A_strip_pattern_is_constant_in_y)
+{
+    StripPattern p = StripPattern(white, black);
+
+    ASSERT_EQ(p.patternAt(Point(0, 0, 0)), white);
+    ASSERT_EQ(p.patternAt(Point(0, 1, 0)), white);
+    ASSERT_EQ(p.patternAt(Point(0, 2, 0)), white);
+}
+
+TEST(PatternTest, A_strip_pattern_is_constant_in_z)
+{
+    StripPattern p = StripPattern(white, black);
+
+    ASSERT_EQ(p.patternAt(Point(0, 0, 0)), white);
+    ASSERT_EQ(p.patternAt(Point(0, 0, 1)), white);
+    ASSERT_EQ(p.patternAt(Point(0, 0, 2)), white);
+}
+
+TEST(PatternTest, A_strip_pattern_alternate_in_x)
+{
+    StripPattern p = StripPattern(white, black);
+
+    ASSERT_EQ(p.patternAt(Point(0, 0, 0)), white);
+    ASSERT_EQ(p.patternAt(Point(0.9, 0, 0)), white);
+    ASSERT_EQ(p.patternAt(Point(1, 0, 0)), black);
+    ASSERT_EQ(p.patternAt(Point(-0.1, 0, 0)), black);
+    ASSERT_EQ(p.patternAt(Point(-1, 0, 0)), black);
+    ASSERT_EQ(p.patternAt(Point(-1.1, 0, 0)), white);
+}
+
+TEST(PatternTest, Lightning_with_a_pattern_applied)
+{
+    Sphere s = Sphere();
+    Material m;
+    StripPattern p = StripPattern(white, black);
+    m.pattern = &p;
+    m.ambient = 1;
+    m.diffuse = 0;
+    m.specular = 0;
+
+    Tuple eyev = Vector(0, 0, -1);
+    Tuple normalv = Vector(0, 0, -1);
+    Light light = Light(POINT_LIGHT, Point(0, 0, -10), Colour(1, 1, 1));
+
+    Colour c1 = m.lighting(light, Point(0, 9, 0), eyev, normalv, &s, false);
+    Colour c2 = m.lighting(light, Point(1, 1, 0), eyev, normalv, &s, false);
+
+    ASSERT_EQ(c1, Colour(1, 1, 1));
+    ASSERT_EQ(c2, Colour(0, 0, 0));
+}
+
+TEST(PatternTest, Stripe_with_an_object_transformation)
+{
+    Sphere s = Sphere();
+    s.setTransform(scaling(2, 2, 2));
+    StripPattern pattern = StripPattern(white, black);
+    Colour c = pattern.patternAtObject(&s, Point(1.5, 0, 0));
+
+    ASSERT_EQ(c, white);
+}
+
+TEST(PatternTest, Stripe_with_a_pattern_transformation)
+{
+    Sphere s = Sphere();
+    StripPattern pattern = StripPattern(white, black);
+    pattern.setTransform(scaling(2, 2, 2));
+    Colour c = pattern.patternAtObject(&s, Point(1.5, 0, 0));
+
+    ASSERT_EQ(c, white);
+}
+
+TEST(PatternTest, Stripe_with_both_an_object_and_a_pattern_transformation)
+{
+    Sphere s = Sphere();
+    s.setTransform(scaling(2, 2, 2));
+    StripPattern pattern = StripPattern(white, black);
+    pattern.setTransform(translation(0.5, 0, 0));
+
+    Colour c = pattern.patternAtObject(&s, Point(2.5, 0, 0));
+
+    ASSERT_EQ(c, white);
+}
+
+TEST(PatternTest, The_default_pattern_transformation)
+{
+    TestPattern pattern = TestPattern();
+
+    ASSERT_EQ(pattern.transformMatrix, Matrix4().identity());
+}
+
+TEST(PatternTest, Assigning_a_transformation)
+{
+    TestPattern pattern = TestPattern();
+    pattern.setTransform(translation(1, 2, 3));
+
+    ASSERT_EQ(pattern.transformMatrix, translation(1, 2, 3));
+}
+
+TEST(PatternTest, A_pattern_with_an_object_transformation)
+{
+    Sphere s = Sphere();
+    s.setTransform(scaling(2, 2, 2));
+    TestPattern pattern = TestPattern();
+
+    Colour c = pattern.patternAtObject(&s, Point(2, 3, 4));
+
+    ASSERT_EQ(c, Colour(1, 1.5, 2));
+}
+
+TEST(PatternTest, A_pattern_with_a_pattern_transformation)
+{
+    Sphere s = Sphere();
+    TestPattern pattern = TestPattern();
+    pattern.setTransform(scaling(2, 2, 2));
+
+    Colour c = pattern.patternAtObject(&s, Point(2, 3, 4));
+
+    ASSERT_EQ(c, Colour(1, 1.5, 2));
+}
+
+TEST(PatternTest, A_pattern_with_an_object_and_a_pattern_transformation)
+{
+    Sphere s = Sphere();
+    s.setTransform(scaling(2, 2, 2));
+    TestPattern pattern = TestPattern();
+    pattern.setTransform(translation(0.5, 1, 1.5));
+
+    Colour c = pattern.patternAtObject(&s, Point(2.5, 3, 3.5));
+
+    ASSERT_EQ(c, Colour(0.75, 0.5, 0.25));
+}
+
+TEST(PatternTest, A_gradient_linearly_interpolates_betweens_colors)
+{
+    GradientPattern pattern = GradientPattern(white, black);
+
+    ASSERT_EQ(pattern.patternAt(Point(0.25, 0, 0)), Colour(0.75, 0.75, 0.75));
+    ASSERT_EQ(pattern.patternAt(Point(0.5, 0, 0)), Colour(0.5, 0.5, 0.5));
+    ASSERT_EQ(pattern.patternAt(Point(0.75, 0, 0)), Colour(0.25, 0.25, 0.25));
+}
+
+TEST(PatternTest, A_ring_should_extend_in_both_x_and_z)
+{
+    RingPattern pattern = RingPattern(white, black);
+
+}