Play with lights

shaders/frag.glsl

@@ -8,9 +8,12 @@ struct Material {
 
 struct Light {
   vec3 position;
+  vec3 direction;
   vec3 ambient;
   vec3 diffuse;
   vec3 specular;
+  float cutoff;
+  float outer_cutoff;
 };
 
 in vec3 vert_normal;
@@ -27,15 +30,18 @@ void main() {
   float ambient_strength   = 0.15;
   float specular_strength  = 0.5;
   vec3  normal             = normalize(vert_normal);
-  vec3  light_direction    = normalize(light.position - frag_position);
+  vec3 light_direction     = normalize(light.position - frag_position);
+  float theta              = dot(light_direction, normalize(-light.direction));
+  float epsilon            = light.cutoff - light.outer_cutoff;
+  float intensity          = clamp((theta - light.outer_cutoff) / epsilon, 0.0, 1.0);
   vec3  view_direction     = normalize(camera_position - frag_position);
   vec3  reflect_direction  = reflect(-light_direction, normal);
   float diff               = max(dot(normal, light_direction), 0.0);
   float spec               = pow(max(dot(reflect_direction, view_direction), 0.0), material.shininess);
   vec3  diff_tex           = vec3(texture(material.diffuse, uv_coords));
   vec3  ambient            = light.ambient * diff_tex;
-  vec3  diffuse            = light.diffuse * (diff * diff_tex);
-  vec3  specular           = light.specular * (spec * vec3(texture(material.specular, uv_coords)));
+  vec3  diffuse            = light.diffuse * (diff * diff_tex) * intensity;
+  vec3  specular           = light.specular * (spec * vec3(texture(material.specular, uv_coords))) * intensity;
 
   color = vec4(ambient + diffuse + specular, 1.0);
 };