Function lm_AllocLightmap

bitmap/lightmap.cpp:59–98

Allocs a lightmap of w x h size Returns lightmap handle if successful, -1 if otherwise

// Allocs a lightmap of w x h size
// Returns lightmap handle if successful, -1 if otherwise
int lm_AllocLightmap(int w, int h) {
  int n; //,i;
  if (Num_of_lightmaps == MAX_LIGHTMAPS)
    Int3(); // Ran out of lightmaps!

  n = Free_lightmap_list[Num_of_lightmaps++];
  ASSERT(GameLightmaps[n].used == 0);
  // If no go on the malloc, bail out with -1

  memset(&GameLightmaps[n], 0, sizeof(bms_lightmap));
  GameLightmaps[n].data = (uint16_t *)mem_malloc((w * h * 2));
  if (!GameLightmaps[n].data) {
    mprintf(0, "NOT ENOUGHT MEMORY FOR LIGHTMAP!\n");
    Int3();
    return BAD_LM_INDEX;
  }

  GameLightmaps[n].width = w;
  GameLightmaps[n].height = h;
  GameLightmaps[n].used = 1;
  GameLightmaps[n].cache_slot = -1;
  GameLightmaps[n].flags = LF_CHANGED;
  // Figure out square size
  // Find power of 2 number
  int res = std::max(w, h);
  int lightmap_res = 2;
  for (int i = 0; i <= 7; i++) {
    int low_num = 1 < i;
    int hi_num = 2 << i;
    if (res <= hi_num && res > low_num) {
      lightmap_res = hi_num;
      break;
    }
  }
  ASSERT(lightmap_res >= 2 && lightmap_res <= 128);
  GameLightmaps[n].square_res = lightmap_res;
  Lightmap_mem_used += (w * h * 2);

  return n;
}
// Given a handle, frees the lightmap memory and flags this lightmap as unused
void lm_FreeLightmap(int handle) {
  if (GameLightmaps[handle].used < 1)