+VG_STATIC void world_prerender( world_instance *world )
+{
+ static double g_time = 0.0;
+ g_time += vg.time_delta * (1.0/(k_day_length*60.0));
+
+ struct ub_world_lighting *state = &world->ub_lighting;
+
+ state->g_time = g_time;
+ state->g_realtime = vg.time;
+ state->g_debug_indices = k_debug_light_indices;
+ state->g_light_preview = k_light_preview;
+ state->g_debug_complexity = k_debug_light_complexity;
+
+ state->g_time_of_day = vg_fractf( g_time );
+ state->g_day_phase = cosf( state->g_time_of_day * VG_PIf * 2.0f );
+ state->g_sunset_phase= cosf( state->g_time_of_day * VG_PIf * 4.0f + VG_PIf );
+
+ state->g_day_phase = state->g_day_phase * 0.5f + 0.5f;
+ state->g_sunset_phase = powf( state->g_sunset_phase * 0.5f + 0.5f, 6.0f );
+
+ float a = state->g_time_of_day * VG_PIf * 2.0f;
+ state->g_sun_dir[0] = sinf( a );
+ state->g_sun_dir[1] = cosf( a );
+ state->g_sun_dir[2] = 0.2f;
+ v3_normalize( state->g_sun_dir );