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