Function LoadPCXTerrain

Descent3/terrain.cpp:795–858

Loads a pcx bitmap to be used as a height map

// Loads a pcx bitmap to be used as a height map
int LoadPCXTerrain(char *filename) {
  CFILE *infile;
  int run = 0, i, total, j, n;
  int16_t xmin, ymin, xmax, ymax;
  int width, height;
  uint8_t buf;
  uint8_t *lando;

  if ((infile = cfopen(filename, "rb")) == NULL)
    return (0);

  cf_ReadInt(infile);
  xmin = cf_ReadShort(infile);
  ymin = cf_ReadShort(infile);
  xmax = cf_ReadShort(infile);
  ymax = cf_ReadShort(infile);

  for (n = 0; n < 116; n++)
    cf_ReadByte(infile);

  width = 1 + xmax - xmin;
  height = 1 + ymax - ymin;

  total = width * height;

  lando = (uint8_t *)mem_malloc(total);

  mprintf(0, "Heightmap is %d x %d\n", width, height);

  while (run < total) {
    buf = cf_ReadByte(infile);
    if (buf >= 192) {
      uint8_t tb = 0;
      tb = cf_ReadByte(infile);
      for (i = 0; i < (buf - 192); i++, run++)
        lando[run] = tb;
    } else {
      lando[run] = buf;
      run++;
    }
  }

  cfclose(infile);

  for (i = 0; i < TERRAIN_DEPTH; i++)
    for (j = 0; j < TERRAIN_WIDTH; j++) {
      n = (int)lando[((i % height) * width) + (j % width)];

      Terrain_seg[((TERRAIN_WIDTH - 1) - i) * TERRAIN_WIDTH + j].ypos = n;
    }

  mem_free(lando);
  BuildMinMaxTerrain();
  BuildTerrainNormals();
  GenerateTerrainLight();

#if (defined(EDITOR) || defined(NEWEDITOR))
  memset(TerrainSelected, 0, TERRAIN_WIDTH * TERRAIN_DEPTH);