From 56959990e4649f11e91ef386c485a3ad37fd0ddd Mon Sep 17 00:00:00 2001
From: Abdelrahman <said.abdelrahman89@gmail.com>
Date: Sun, 4 Feb 2024 00:19:11 +0000
Subject: [PATCH] Add shadows

---
 src/raytracer/main.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/raytracer/main.c b/src/raytracer/main.c
index 0e305ad..2f2a4ad 100644
--- a/src/raytracer/main.c
+++ b/src/raytracer/main.c
@@ -2,6 +2,7 @@
 #include "vector/vec.h"
 #include "window/window.h"
 #include <SDL2/SDL_events.h>
+#include <float.h>
 #include <math.h>
 #include <stdbool.h>
 #include <stdint.h>
@@ -282,18 +283,27 @@ f32 compute_lighting(vec3f_t position, vec3f_t surface_normal,
       I += light.intensity;
     } else {
       vec3f_t light_direction = {0};
+      f32 t_max = FLT_EPSILON;
 
       switch (light.type) {
       case LIGHT_TYPE_POINT:
         light_direction = vec_sub(vec3f_t, light.position, position);
+        t_max = 1;
         break;
       case LIGHT_TYPE_DIRECTIONAL:
         light_direction = light.direction;
+        t_max = INFINITY;
         break;
       default:
         break;
       }
 
+      intersection_t shadow = find_closest_intersection(
+          position, light_direction, 0.001f, t_max, scene);
+      if (shadow.closest_sphere != NULL) {
+        continue;
+      }
+
       I += light_diffuse(light.intensity, light_direction, surface_normal);
 
       if (specular_exponent != -1.0f) {