Function AssignRoomSurfaceToLightmap

editor/editor_lighting.cpp:1309–1389

Allocates and sets a lightmap based on the surface elements given

// Allocates and sets a lightmap based on the surface elements given
void AssignRoomSurfaceToLightmap(int roomnum, int facenum, rad_surface *sp) {
  face *fp = &Rooms[roomnum].faces[facenum];
  room *rp = &Rooms[roomnum];

  int i, t, lmi_handle;
  int xres, yres;
  int lw, lh;
  int x1 = sp->x1;
  int y1 = sp->y1;
  int use_lightmap = 1;

  xres = sp->xresolution;
  yres = sp->yresolution;

  ASSERT(fp->lmi_handle != BAD_LMI_INDEX);
  lmi_handle = fp->lmi_handle;

  lw = lmi_w(lmi_handle);
  lh = lmi_h(lmi_handle);

  ASSERT((xres + x1) <= lw);
  ASSERT((yres + y1) <= lh);

  ASSERT(lw >= 2);
  ASSERT(lh >= 2);

  uint16_t *dest_data = lm_data(LightmapInfo[lmi_handle].lm_handle);

  // Set face pointer
  if (GameTextures[fp->tmap].flags & TF_ALPHA)
    use_lightmap = 0;
  if (GameTextures[fp->tmap].flags & (TF_FORCE_LIGHTMAP | TF_SATURATE_LIGHTMAP))
    use_lightmap = 1;

  if (use_lightmap)
    fp->flags |= FF_LIGHTMAP;

  for (i = 0; i < yres; i++) {
    for (t = 0; t < xres; t++) {
      if (!(sp->elements[i * xres + t].flags & EF_IGNORE)) {
        ddgr_color color = GR_16_TO_COLOR(dest_data[(i + y1) * lw + (t + x1)]);
        int red = GR_COLOR_RED(color);
        int green = GR_COLOR_GREEN(color);
        int blue = GR_COLOR_BLUE(color);

        float fr, fg, fb;

        if (!(dest_data[(i + y1) * lw + (t + x1)] & OPAQUE_FLAG)) {
          red = green = blue = 0;
        }

        fr = std::min(1.0f, sp->elements[i * xres + t].exitance.r + Ambient_red + Room_ambience_r[roomnum]);
        fg = std::min(1.0f, sp->elements[i * xres + t].exitance.g + Ambient_green + Room_ambience_g[roomnum]);
        fb = std::min(1.0f, sp->elements[i * xres + t].exitance.b + Ambient_blue + Room_ambience_b[roomnum]);

        fr = (fr * 255) + .5;
        fg = (fg * 255) + .5;
        fb = (fb * 255) + .5;