Method ParseTexture

src/lua/LuaTextures.cpp:932–991

bool LuaTextureMgr::ParseTexture(lua_State* L, int index) {
  // enable/disable for GL_TEXTURE_2D
  if (lua_isboolean(L, index)) {
    if (lua_tobool(L, index)) {
      glEnable(GL_TEXTURE_2D);
    }
    else {
      glDisable(GL_TEXTURE_2D);
    }
    return true;
  }

  // named engine textures
  if (lua_israwstring(L, index)) {
    const std::string name = lua_tostring(L, index);
    if (OpenGLPassState::CreatingList() && !TEXMGR.isLoaded(name)) {
      luaL_error(L, "textures can not be created while creating display lists");
    }
    const int bzTexID = TEXMGR.getTextureID(name, false);
    if (bzTexID < 0) {
      glDisable(GL_TEXTURE_2D);
      return false;
    }
    const ImageInfo& ii = TEXMGR.getInfo(bzTexID);
    if ((ii.texture == NULL) || !ii.texture->execute()) {
      glDisable(GL_TEXTURE_2D);
      return false;
    }

    glEnable(GL_TEXTURE_2D);
    return true;
  }

  // lua texture (ref or obj)
  const LuaTexture* texture = CheckLuaTexture(L, index);
  if ((texture == NULL) || !texture->IsValid()) {
    return false;
  }

  // enable/disable for lua texture's target
  const int stateIndex = index + 1;
  if (lua_isboolean(L, stateIndex)) {
    if (lua_tobool(L, stateIndex)) {
      glEnable(texture->GetTarget());
    }
    else {
      glDisable(texture->GetTarget());
    }
    return true;
  }

  // bind a lua texture
  if (!texture->Bind()) {
    glDisable(texture->GetTarget());
    return false;
  }

  glEnable(texture->GetTarget());