local OPCODE = 47 -- change this
function init()
  ProtocolGame.registerOpcode(OPCODE, setMapShader)
end

function terminate()
  ProtocolGame.unregisterOpcode(OPCODE)
end

function setMapShader(protocol, msg)
    local map = modules.game_interface.getMapPanel()
    local action = msg:getU8()
    local shader = msg:getString()
    
    if action == 1 then
    map:setShader(shader)
    else
    map:setShader('Default')
    end
end