Method CopyToTexture

src/lua/LuaTextures.cpp:1109–1151

int LuaTextureMgr::CopyToTexture(lua_State* L) {
  //LuaOpenGL::CheckDrawingEnabled(L, __FUNCTION__);

  const LuaTexture* texture = CheckLuaTexture(L, 1);
  if (!texture->IsWritable()) {
    return luaL_pushnil(L);
  }
  const GLenum texTarget = texture->GetTarget();

  if (!OpenGLPassState::PushAttrib(GL_TEXTURE_BIT)) {
    return luaL_pushnil(L); // exceeded the attrib stack depth
  }

  if (!texture->Bind()) {
    OpenGLPassState::PopAttrib();
    lua_pushboolean(L, false);
    return 1;
  }

  const GLint xoff = (GLint)luaL_checkint(L, 2);
  const GLint yoff = (GLint)luaL_checkint(L, 3);
  const GLint    x = (GLint)luaL_checkint(L, 4);
  const GLint    y = (GLint)luaL_checkint(L, 5);
  const GLsizei  w = (GLsizei)luaL_checkint(L, 6);
  const GLsizei  h = (GLsizei)luaL_checkint(L, 7);
  const GLenum target = (GLenum)luaL_optint(L, 8, texTarget);
  const GLenum level  = (GLenum)luaL_optint(L, 9, 0);

  glGetError(); // clear the error
  glCopyTexSubImage2D(target, level, xoff, yoff, x, y, w, h);

  const GLenum errgl = glGetError();
  OpenGLPassState::PopAttrib();

  if (errgl != GL_NO_ERROR) {
    lua_pushboolean(L, false);
    lua_pushinteger(L, errgl);
    return 2;
  }

  lua_pushboolean(L, true);
  return 1;
}


int LuaTextureMgr::GenerateMipMap(lua_State* L) {