Function UpdateSingleTerrainLightmap

Descent3/terrain.cpp:1027–1050

}

void UpdateSingleTerrainLightmap(int which) {
  int w = lm_w(TerrainLightmaps[which]);
  int i, t;

  GameLightmaps[TerrainLightmaps[which]].flags |= LF_CHANGED;

  int sx = (which % 2) * 128;
  int sz = (which / 2) * 128;

  for (i = sz; i < sz + 128; i++) {
    for (t = sx; t < sx + 128; t++) {
      int tseg = i * TERRAIN_WIDTH + t;
      terrain_segment *tp = &Terrain_seg[tseg];

      uint16_t color = GR_RGB16(tp->r, tp->g, tp->b);
      uint16_t *data = lm_data(TerrainLightmaps[which]);

      int x = t % 128;
      int y = 127 - (i % 128);

      data[y * w + x] = OPAQUE_FLAG | color;
    }
  }
}

// Generates lightmaps based on the info given by the .light field of each Terrain_seg
void UpdateTerrainLightmaps() {