Function RenderFace

Descent3/render.cpp:1722–2124

Draw the specified face Parameters: rp - pointer to the room the face is un facenum - which face in the specified room

// Parameters:	rp - pointer to the room the face is un
//				facenum - which face in the specified room
void RenderFace(room *rp, int facenum) {
  int vn, drawn = 0;
  face *fp = &rp->faces[facenum];
  g3Point *pointlist[MAX_VERTS_PER_FACE];
  g3Point pointbuffer[MAX_VERTS_PER_FACE];
  int bm_handle;
  float uchange = 0, vchange = 0;
  texture_type tt;
  uint8_t do_triangle_test = 0;
  g3Codes face_cc;
  static int first = 1;
  static float lm_red[32], lm_green[32], lm_blue[32];
  bool spec_face = 0;
  face_cc.cc_and = 0xff;
  face_cc.cc_or = 0;
#ifdef EDITOR
  if (fp->flags & FF_FLOATING_TRIG) {
    RenderFloatingTrig(rp, fp);
    return;
  }
#endif
  // Clear triangulation flag
  fp->flags &= ~FF_TRIANGULATED;
  // check for render windows hack
  if (No_render_windows_hack == 1) {
    if (fp->portal_num != -1)
      return;
  }
  if (rp->flags & RF_TRIANGULATE)
    do_triangle_test = 1;
  if (!Render_mirror_for_room && Detail_settings.Specular_lighting && (GameTextures[fp->tmap].flags & TF_SPECULAR) &&
      ((fp->special_handle != BAD_SPECIAL_FACE_INDEX) || (rp->flags & RF_EXTERNAL)))
    spec_face = 1;
  // Figure out if there is any texture sliding
  if (GameTextures[fp->tmap].slide_u != 0) {
    int int_time = Gametime / GameTextures[fp->tmap].slide_u;
    float norm_time = Gametime - (int_time * GameTextures[fp->tmap].slide_u);
    norm_time /= GameTextures[fp->tmap].slide_u;
    uchange = norm_time;
  }
  if (GameTextures[fp->tmap].slide_v != 0) {
    int int_time = Gametime / GameTextures[fp->tmap].slide_v;
    float norm_time = Gametime - (int_time * GameTextures[fp->tmap].slide_v);
    norm_time /= GameTextures[fp->tmap].slide_v;
    vchange = norm_time;
  }
  // Build list of points and UVLs for this face
  if (Render_mirror_for_room) // If mirror room, order the vertices counter clockwise
  {
    for (vn = 0; vn < fp->num_verts; vn++) {
      pointbuffer[vn] = World_point_buffer[rp->wpb_index + fp->face_verts[vn]];
      g3Point *p = &pointbuffer[vn];
      pointlist[(fp->num_verts - 1) - vn] = p;
      p->p3_uvl.u = fp->face_uvls[vn].u;
      p->p3_uvl.v = fp->face_uvls[vn].v;
      p->p3_uvl.u2 = fp->face_uvls[vn].u2;
      p->p3_uvl.v2 = fp->face_uvls[vn].v2;