91 lines
3.9 KiB
C
91 lines
3.9 KiB
C
#include "canvas.h"
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#include "exceptions.h"
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#include "ray.h"
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#include <stdio.h>
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#include <sphere.h>
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CEXCEPTION_T global_exception;
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int main(void) {
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Try {
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double wall_z = 10;
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double wall_size = 7;
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unsigned int canvas_pixels = 500;
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double pixel_size = wall_size / canvas_pixels;
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double half = wall_size / 2;
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CANVAS_Canvas* canvas = CANVAS_new(canvas_pixels, canvas_pixels);
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TUPLES_Point* ray_origin = TUPLES_new_point(0, 0, -5);
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SPHERE_Sphere* sphere = SPHERE_new();
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MATERIAL_Material* material = MATERIAL_new();
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TUPLES_init_color(&material->color, 1, 0.2, 1);
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SPHERE_set_material(sphere, material);
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MATERIAL_delete(material);
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TUPLES_Point* light_position = TUPLES_new_point(-10, 10, -10);
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TUPLES_Color* light_color = TUPLES_new_color(1, 1, 1);
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LIGHTS_Light* light = LIGHTS_new_pointlight(light_position, light_color);
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TUPLES_delete_all(light_position, light_color);
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for (uint y=0; y < canvas_pixels - 1; y++) {
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double world_y = half - pixel_size * y;
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for (uint x=0; x < canvas_pixels - 1; x++) {
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double world_x = -half + pixel_size * x;
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TUPLES_Point position;
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TUPLES_Vector v_tmp;
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RAY_Ray r;
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TUPLES_init_point(&position, world_x, world_y, wall_z);
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TUPLES_subtract(&v_tmp, &position, ray_origin);
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TUPLES_normalize(&v_tmp);
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RAY_init_from_tuples(&r, ray_origin, &v_tmp);
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RAY_Ray local_ray;
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SHAPE_calc_local_ray(&local_ray, &r, (SHAPE_Shape*) sphere);
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RAY_Intersections* xs = RAY_new_intersections();
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SPHERE_local_intersect(xs, sphere, &local_ray);
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RAY_Xs* hit = RAY_hit(xs);
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if (hit) {
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TUPLES_Point point_of_intersection;
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TUPLES_Vector normal;
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TUPLES_Vector eyev;
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TUPLES_Color color;
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TUPLES_Point local_point;
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TUPLES_Vector world_normal;
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RAY_position(&point_of_intersection, &r, hit->t);
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SHAPE_world_to_object(&local_point, (SHAPE_Shape*) sphere, &point_of_intersection);
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SPHERE_local_normal_at(&normal, sphere, &local_point, NULL);
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SHAPE_normal_to_world(&world_normal, (SHAPE_Shape*) sphere, &normal);
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TUPLES_copy(&eyev, &r.direction);
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TUPLES_negate(&eyev);
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MATERIAL_lighting(&color, sphere, light, &point_of_intersection, &eyev, &world_normal, false);
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CANVAS_write_pixel(canvas, x, y, &color);
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}
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RAY_delete_intersections(xs);
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RAY_destroy(&r);
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}
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}
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char *filename = "phong_render_sphere.ppm";
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printf("Writing file %s...", filename);
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CANVAS_write_to_file(canvas, filename);
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printf("done\n");
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LIGHTS_delete(light);
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SPHERE_delete(sphere);
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CANVAS_delete(canvas);
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TUPLES_delete_all(ray_origin);
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} Catch(global_exception) {
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if (global_exception == E_MALLOC_FAILED)
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printf("Malloc failed. Exiting\n");
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else if (global_exception == E_FILE_FAILED)
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printf("Failed to open test.ppm\n");
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else
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printf("Unknown exception %i occurred\n", global_exception);
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}
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return 0;
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}
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