raytracer-c/test/module_datastructures/test_material.c

#include "material.h"
#include "lights.h"
#include <unity.h>

void setUp() {}
void tearDown() {}

void test_default_material() {
    MATERIAL_Material* m = MATERIAL_new();
    TUPLES_Color c = TUPLES_color(1, 1, 1);
    TEST_ASSERT_TRUE(TUPLES_is_equal(&c, &m->color));
    TEST_ASSERT_EQUAL_DOUBLE(0.1, m->ambient);
    TEST_ASSERT_EQUAL_DOUBLE(0.9, m->diffuse);
    TEST_ASSERT_EQUAL_DOUBLE(0.9, m->specular);
    TEST_ASSERT_EQUAL_DOUBLE(200.0, m->shininess);
    MATERIAL_delete(m);
}

void test_lighting_with_eye_between_light_and_surface_in_shadow() {
    MATERIAL_Material* material = MATERIAL_new();
    TUPLES_Point position = TUPLES_point(0, 0, 0);
    TUPLES_Vector eyev = TUPLES_vector(0, 0, -1);
    TUPLES_Vector normalv = TUPLES_vector(0, 0, -1);

    LIGHTS_PointLight* pl = LIGHTS_new_pointlight(
            TUPLES_point(0, 0, -10),
            TUPLES_color(1, 1, 1));

    TUPLES_Color result = MATERIAL_lighting(material, pl, position, eyev, normalv, true);

    TUPLES_Color expected_result = TUPLES_color(0.1, 0.1, 0.1);
    TEST_ASSERT_TRUE(TUPLES_is_equal(&expected_result, &result));
    LIGHTS_delete_pointlight(pl);
    MATERIAL_delete(material);
}

void test_lighting_with_eye_between_light_and_surface() {
    MATERIAL_Material* material = MATERIAL_new();
    TUPLES_Point position = TUPLES_point(0, 0, 0);
    TUPLES_Vector eyev = TUPLES_vector(0, 0, -1);
    TUPLES_Vector normalv = TUPLES_vector(0, 0, -1);

    TUPLES_Point light_position = TUPLES_point(0, 0, -10);
    TUPLES_Color light_color = TUPLES_color(1, 1, 1);
    LIGHTS_PointLight* pl = LIGHTS_new_pointlight(light_position, light_color);

    TUPLES_Color result = MATERIAL_lighting(material, pl, position, eyev, normalv, false);

    TUPLES_Color expected_result = TUPLES_color(1.9, 1.9, 1.9);
    TEST_ASSERT_TRUE(TUPLES_is_equal(&expected_result, &result));
    LIGHTS_delete_pointlight(pl);
    MATERIAL_delete(material);
}

void test_lighting_with_eye_between_light_and_surface_eye_offset_45_deg() {
    MATERIAL_Material* material = MATERIAL_new();
    TUPLES_Point position = TUPLES_point(0, 0, 0);
    TUPLES_Vector eyev = TUPLES_vector(0, sqrt(2.0)/2.0, sqrt(2.0)/2.0);
    TUPLES_Vector normalv = TUPLES_vector(0, 0, -1);

    TUPLES_Point light_position = TUPLES_point(0, 0, -10);
    TUPLES_Color light_color = TUPLES_color(1, 1, 1);
    LIGHTS_PointLight* pl = LIGHTS_new_pointlight(light_position, light_color);

    TUPLES_Color result = MATERIAL_lighting(material, pl, position, eyev, normalv, false);

    TUPLES_Color expected_result = TUPLES_color(1.0, 1.0, 1.0);
    TEST_ASSERT_TRUE(TUPLES_is_equal(&expected_result, &result));
    LIGHTS_delete_pointlight(pl);
    MATERIAL_delete(material);
}

void test_lighting_with_eye_opposite_surface_light_offset_45_deg() {
    MATERIAL_Material* material = MATERIAL_new();
    TUPLES_Point position = TUPLES_point(0, 0, 0);
    TUPLES_Vector eyev = TUPLES_vector(0, 0, -1);
    TUPLES_Vector normalv = TUPLES_vector(0, 0, -1);

    TUPLES_Point light_position = TUPLES_point(0, 10, -10);
    TUPLES_Color light_color = TUPLES_color(1, 1, 1);
    LIGHTS_PointLight* pl = LIGHTS_new_pointlight(light_position, light_color);

    TUPLES_Color result = MATERIAL_lighting(material, pl, position, eyev, normalv, false);

    TUPLES_Color expected_result = TUPLES_color(0.7364, 0.7364, 0.7364);
    TEST_ASSERT_TRUE(TUPLES_is_equal(&expected_result, &result));
    LIGHTS_delete_pointlight(pl);
    MATERIAL_delete(material);
}

void test_lighting_with_eye_in_path_of_reflection_vector() {
    MATERIAL_Material* material = MATERIAL_new();
    TUPLES_Point position = TUPLES_point(0, 0, 0);
    TUPLES_Vector eyev = TUPLES_vector(0, -sqrt(2.0)/2.0, -sqrt(2.0)/2.0);
    TUPLES_Vector normalv = TUPLES_vector(0, 0, -1);

    TUPLES_Point light_position = TUPLES_point(0, 10, -10);
    TUPLES_Color light_color = TUPLES_color(1, 1, 1);
    LIGHTS_PointLight* pl = LIGHTS_new_pointlight(light_position, light_color);

    TUPLES_Color result = MATERIAL_lighting(material, pl, position, eyev, normalv, false);

    TUPLES_Color expected_result = TUPLES_color(1.6364, 1.6364, 1.6364);
    TEST_ASSERT_TRUE(TUPLES_is_equal(&expected_result, &result));
    LIGHTS_delete_pointlight(pl);
    MATERIAL_delete(material);
}

void test_lighting_with_light_behind_surface() {
    MATERIAL_Material* material = MATERIAL_new();
    TUPLES_Point position = TUPLES_point(0, 0, 0);
    TUPLES_Vector eyev = TUPLES_vector(0, 0, -1);
    TUPLES_Vector normalv = TUPLES_vector(0, 0, -1);

    TUPLES_Point light_position = TUPLES_point(0, 0, 10);
    TUPLES_Color light_color = TUPLES_color(1, 1, 1);
    LIGHTS_PointLight* pl = LIGHTS_new_pointlight(light_position, light_color);

    TUPLES_Color result = MATERIAL_lighting(material, pl, position, eyev, normalv, false);

    TUPLES_Color expected_result = TUPLES_color(0.1, 0.1, 0.1);
    TEST_ASSERT_TRUE(TUPLES_is_equal(&expected_result, &result));
    LIGHTS_delete_pointlight(pl);
    MATERIAL_delete(material);
}


int main(void)
{
    UNITY_BEGIN();
    RUN_TEST(test_default_material);
    RUN_TEST(test_lighting_with_eye_between_light_and_surface);
    RUN_TEST(test_lighting_with_eye_between_light_and_surface_eye_offset_45_deg);
    RUN_TEST(test_lighting_with_eye_opposite_surface_light_offset_45_deg);
    RUN_TEST(test_lighting_with_eye_in_path_of_reflection_vector);
    RUN_TEST(test_lighting_with_light_behind_surface);
    RUN_TEST(test_lighting_with_eye_between_light_and_surface_in_shadow);
    return UNITY_END();
}