static void get_lum(double *col, t_scene *s, t_intersect *inter, int m)
{
t_vec3 l;
t_vec3 r;
double ln;
int i;
double is;
double id;
double dist;
double rv;
double tmp;
t_ray ray;
t_intersect shadow;
i = -1;
if (s->lights[m].light.type == DIRECTIONNAL)
{
while (++i < 3)
{
ln = dot_vec3(inter->norm, s->lights[m].light.dir);
col[i] = MAX(ln, 0) * s->lights[m].light.color.argb[i] / 255.0 *
s->lights[m].light.power;
}
return ;
}
l = sub_vec3(s->lights[m].pos, inter->pos);
dist = vec3_len(l);
l = div_vec3(l, dist);
dist -= s->lights[m].light.radius;
ln = dot_vec3(l, inter->norm);
ln = MAX(ln, 0.0);
r = vec3_normalize(sub_vec3(mult_vec3(inter->norm, 2 * ln), l));
is = s->lights[m].light.power / dist;
id = s->lights[m].light.radius * is;
rv = -dot_vec3(r, inter->dir);
rv = MAX(rv, 0.0);
ray.pos = add_vec3(inter->pos, mult_vec3(inter->norm, 0.00001));
ray.dir = l;
ray.env = NULL;
scene_intersect(s, &ray, &shadow);
if (shadow.dist < dist - 0.0001)
return ;
while (++i < 3)
{
tmp = inter->mat->diffuse * MAX(ln, 0) * id *
s->lights[m].light.color.argb[i] / 255.0;
col[i] += MAX(tmp, 0);
tmp = inter->mat->specular * pow(rv, inter->mat->shininess)
* is * s->lights[m].light.color.argb[i] / 255.0;
col[i] += MAX(tmp, 0);
}
}
/*
* Fragment shader for surface lighting. One directional light source, phong shading.
*/
static void fragment_shader_light(int y, int x, struct fragment_input *input, struct uniform_variables *vars){
if(input->frag_coord[VAR_Z] >= read_depth(y, x)){
return;
}
float *light_dir = &(vars->uniform_float[0]);
vec3 eye_normal, object_normal;
object_normal[VAR_X] = input->attributes[0] / input->frag_coord[VAR_W];
object_normal[VAR_Y] = input->attributes[1] / input->frag_coord[VAR_W];
object_normal[VAR_Z] = input->attributes[2] / input->frag_coord[VAR_W];
eye_normal[VAR_X] = input->attributes[3] / input->frag_coord[VAR_W];
eye_normal[VAR_Y] = input->attributes[4] / input->frag_coord[VAR_W];
eye_normal[VAR_Z] = input->attributes[5] / input->frag_coord[VAR_W];
normalize_vec3(eye_normal);
normalize_vec3(object_normal);
if(input->front_facing == ER_FALSE){
eye_normal[VAR_X] = -eye_normal[VAR_X];
eye_normal[VAR_Y] = -eye_normal[VAR_Y];
eye_normal[VAR_Z] = -eye_normal[VAR_Z];
object_normal[VAR_X] = -object_normal[VAR_X];
object_normal[VAR_Y] = -object_normal[VAR_Y];
object_normal[VAR_Z] = -object_normal[VAR_Z];
}
float diffuse_term = max(0.0f, dot_vec3(light_dir, eye_normal) );
float specular_term = 0.0f;
vec3 view_vector;
vec3 half_vector;
view_vector[VAR_X] = 0.0f;
view_vector[VAR_Y] = 0.0f;
view_vector[VAR_Z] = 1.0f;
if(diffuse_term > 0.0f){
half_vector[VAR_X] = light_dir[VAR_X] + view_vector[VAR_X];
half_vector[VAR_Y] = light_dir[VAR_Y] + view_vector[VAR_Y];
half_vector[VAR_Z] = light_dir[VAR_Z] + view_vector[VAR_Z];
normalize_vec3(half_vector);
specular_term = pow( max(0.0f, dot_vec3(half_vector, eye_normal)), 50.0f );
}
float red, green, blue, light_intensity;
light_intensity = 0.6f * diffuse_term + 0.4f * specular_term;
red = (object_normal[VAR_X] * 0.5f + 0.5f) * light_intensity;
red = clamp(red, 0.0f, 1.0f);
green = (object_normal[VAR_Y] * 0.5f + 0.5f) * light_intensity;
green = clamp(green, 0.0f, 1.0f);
blue = (object_normal[VAR_Z] * 0.5f + 0.5f) * light_intensity;
blue = clamp(blue, 0.0f, 1.0f);
write_color(y, x, red, green, blue, 1.0f);
write_depth(y, x, input->frag_coord[VAR_Z]);
}
s_mat4 fps_view_rh(s_vec3 eye, float pitch, float yaw)
{
float cosPitch = cos(pitch);
float sinPitch = sin(pitch);
float cosYaw = cos(yaw);
float sinYaw = sin(yaw);
s_vec3 xaxis = vec3(cosYaw, 0, -sinYaw);
s_vec3 yaxis = vec3(sinYaw * sinPitch, cosPitch, cosYaw * sinPitch);
s_vec3 zaxis = vec3(sinYaw * cosPitch, -sinPitch, cosPitch * cosYaw);
// Create a 4x4 view matrix from the right, up, forward and eye position vectors
return mat4(xaxis.i, xaxis.j, xaxis.k, -dot_vec3(xaxis, eye),
yaxis.i, yaxis.j, yaxis.k, -dot_vec3(yaxis, eye),
zaxis.i, zaxis.j, zaxis.k, -dot_vec3(zaxis, eye),
0, 0, 0, 1);
}
