/* multiples two colors channels together to blend
* if clamp is 0, color values will not be clamped
* if clamp is 1, color values will be clamped at 1.0f */
color_t* color_mult(color_t *colorout, const color_t *color1,
const color_t *color2, unsigned int clamp)
{
colorout->r = color1->r * color2->r;
colorout->g = color1->g * color2->g;
colorout->b = color1->b * color2->b;
if(clamp)
color_clamp(colorout);
return colorout;
}
/* scales the color by a factor
* if clamp is 0, color values will not be clamped
* if clamp is 1, color values will be clamped at 1.0f */
color_t* color_scale(color_t *colorout, const color_t *color,
float scale, unsigned int clamp)
{
colorout->r = color->r * scale;
colorout->g = color->g * scale;
colorout->b = color->b * scale;
if(clamp)
color_clamp(colorout);
return colorout;
}
static void raycast_light(t_hit *hit, unsigned depth)
{
t_lstiter it;
t_ray ray;
t_light *light;
int raycast_result;
t_vec3 lightness;
t_hit sub_hit;
if (depth == 0)
return ;
vec3_set(&lightness, 0, 0, 0);
init_iter(&it, rt.scene->lights, increasing);
while (lst_iterator_next(&it))
{
light = (t_light*)it.data;
vec3_copy(&ray.origin, &hit->position);
vec3_copy(&ray.direction, &light->position);
vec3_sub(&ray.direction, &hit->position);
vec3_normalize(&ray.direction);
ray.origin.x += ray.direction.x * RC_SHADOW_SHIFT;
ray.origin.y += ray.direction.y * RC_SHADOW_SHIFT;
ray.origin.z += ray.direction.z * RC_SHADOW_SHIFT;
raycast_result = raycast(&ray, &sub_hit, depth - 1, NULL);
if (sub_hit.object != NULL)
{
// ray bounce
}
else
{
vec3_add(&lightness, &light->color);
}
}
vec3_div(&lightness, rt.scene->lights->size);
vec3_add(&lightness, &rt.scene->ambient_light);
color_clamp(&lightness);
hit->color.x *= lightness.x;
hit->color.y *= lightness.y;
hit->color.z *= lightness.z;
}
