Block or Replace Object Creation v1.2 for SAPP

-- Block or Replace Object Creation v1.2 by H® Shaft

-- This script will:
-- Help you with replacing one object with another, or blocking it from being created, and using the best method for doing so.
-- Note: Not intended as a game script, but a sample script to illustrate replacing one object with another, or blocking it from being created

-- Advantage to replacing or blocking an object:
-- You could disable a weapon with execute_command("disable_object weapons\\plasma_cannon\\plasma_cannon") or in events using disable_object, BUT,
-- instead, why not replace it with a weapon/vehicle/equipment/projectile you WANT? Or, block it from being created?

-- sapp api version
api_version = "1.8.0.0"

function OnScriptLoad()
    register_callback(cb['EVENT_GAME_START'], "OnNewGame")
    register_callback(cb['EVENT_OBJECT_SPAWN'], "OnObjectSpawn")
    if get_var(0, "$gt") ~= "n/a" then
        GetMetaIDs()
    end
end

function OnScriptUnload() end

function OnNewGame()
    GetMetaIDs()
end

function OnObjectSpawn(PlayerIndex, MapID, ParentID, ObjectID)
    -- note: vehicles, flag/oddball can be ONLY be replaced/blocked using get_tag_info (Examine both below to see the difference).
    -- Weapons, Equipment, Bipeds and Projectiles can use both metaid replacement or get_tag_info methods.

    -- replace chain warthog with banshee
    if MapID == get_tag_info("vehi", "vehicles\\warthog\\mp_warthog") then
        return true, get_tag_info("vehi", "vehicles\\banshee\\banshee_mp")
    end

    -- replace rocket warthog with banshee
    if MapID == get_tag_info("vehi", "vehicles\\rwarthog\\rwarthog") then
        return true, get_tag_info("vehi", "vehicles\\banshee\\banshee_mp")
    end

    -- replace ghost vehicle with a banshee
    if MapID == get_tag_info("vehi", "vehicles\\ghost\\ghost_mp") then
        return true, get_tag_info("vehi", "vehicles\\banshee\\banshee_mp")
    end

    -- replace the active camo with an overshield
    if MapID == eqip_camo_metaid then
        return true, eqip_overshield_metaid
    end

    -- replace the fuel rod gun with a flame-thrower
    if MapID == weap_fuel_rod_gun_metaid then
        return true, weap_flamer_metaid
    end

    -- replace the flame thrower projectile with covie turret bolt - Very anti-banshee flamer- (you will still see the flames, but are shooting the bolt)
    if MapID == proj_flame_metaid then
        return true, proj_turret_bolt_metaid
    end

    -- replace the rocket launcher with a sniper rifle
    if MapID == weap_rocket_launcher_metaid then
        return true, weap_sniper_rifle_metaid
    end

    -- replace the pistol with a flame thrower
    if MapID == weap_pistol_metaid then
        return true, weap_flamer_metaid
    end

    -- replace frag grenade equipment with plasma grenades:
    if MapID == eqip_frag_metaid then
        return true, eqip_plasma_metaid
    end

    -- replace frag grenade projectiles with plasma projectiles (doesn't happen until you throw):
    if MapID == proj_frag_nade_metaid then
        return true, proj_plasma_nade_metaid
    end

    -- block the creation of the banshees fuel rod (alternate fire) projectile (you will still see it, but it won't be there, no damage)
    if MapID == proj_banshee_fuelrod_metaid then
        return false
    end

    -- block the creation of scorpion tank
    if MapID == get_tag_info("vehi", "vehicles\\scorpion\\scorpion_mp") then
        return false
    end

    -- block the creation of covenant turret
    if MapID == get_tag_info("vehi", "vehicles\\c gun turret\\c gun turret_mp") then
        return false
    end

    return true
end

function get_tag_info(obj_type, obj_name)
    local tag_id = lookup_tag(obj_type, obj_name)
    return tag_id ~= 0 and read_dword(tag_id + 0xC) or nil
end

-- items commented out here with "--" are still valid, but not used in THIS script, simply remove the "--" to use them in YOUR script
function GetMetaIDs()
    vehi_cov_turret_metaid = read_dword(lookup_tag("vehi", "vehicles\\c gun turret\\c gun turret_mp") + 12)
    vehi_tank_metaid = read_dword(lookup_tag("vehi", "vehicles\\scorpion\\scorpion_mp") + 12)
    vehi_ghost_metaid = read_dword(lookup_tag("vehi", "vehicles\\ghost\\ghost_mp") + 12)
    vehi_banshee_metaid = read_dword(lookup_tag("vehi", "vehicles\\banshee\\banshee_mp") + 12)
    vehi_rocket_hog_metaid = read_dword(lookup_tag("vehi", "vehicles\\rwarthog\\rwarthog") + 12)
    vehi_chain_hog_metaid = read_dword(lookup_tag("vehi", "vehicles\\warthog\\mp_warthog") + 12)
    weap_fuel_rod_gun_metaid = read_dword(lookup_tag("weap", "weapons\\plasma_cannon\\plasma_cannon") + 12)
    weap_rocket_launcher_metaid = read_dword(lookup_tag("weap", "weapons\\rocket launcher\\rocket launcher") + 12)
    weap_sniper_rifle_metaid = read_dword(lookup_tag("weap", "weapons\\sniper rifle\\sniper rifle") + 12)
    --weap_plasma_pistol_metaid = read_dword(lookup_tag("weap", "weapons\\plasma pistol\\plasma pistol") + 12)
    --weap_flag_metaid = read_dword(lookup_tag("weap", "weapons\\flag\\flag") + 12)
    --weap_plasma_rifle_metaid = read_dword(lookup_tag("weap", "weapons\\plasma rifle\\plasma rifle") + 12)
    --weap_assault_rifle_metaid = read_dword(lookup_tag("weap", "weapons\\assault rifle\\assault rifle") + 12)
    weap_flamer_metaid = read_dword(lookup_tag("weap", "weapons\\flamethrower\\flamethrower") + 12)
    --weap_needler_metaid = read_dword(lookup_tag("weap", "weapons\\needler\\mp_needler") + 12)
    weap_pistol_metaid = read_dword(lookup_tag("weap", "weapons\\pistol\\pistol") + 12)
    --weap_shotgun_metaid = read_dword(lookup_tag("weap", "weapons\\shotgun\\shotgun") + 12)
    eqip_frag_metaid = read_dword(lookup_tag("eqip", "weapons\\frag grenade\\frag grenade") + 12)
    eqip_plasma_metaid = read_dword(lookup_tag("eqip", "weapons\\plasma grenade\\plasma grenade") + 12)
    eqip_camo_metaid = read_dword(lookup_tag("eqip", "powerups\\active camouflage") + 12)
    eqip_overshield_metaid = read_dword(lookup_tag("eqip", "powerups\\over shield") + 12)
    --eqip_health_metaid = read_dword(lookup_tag("eqip", "powerups\\health pack") + 12)
    proj_plasma_nade_metaid = read_dword(lookup_tag("proj", "weapons\\plasma grenade\\plasma grenade") + 12)
    proj_frag_nade_metaid = read_dword(lookup_tag("proj", "weapons\\frag grenade\\frag grenade") + 12)
    proj_banshee_fuelrod_metaid = read_dword(lookup_tag("proj", "vehicles\\banshee\\mp_banshee fuel rod") + 12)
    --proj_banshee_bolt_metaid = read_dword(lookup_tag("proj", "vehicles\\banshee\\banshee bolt") + 12)
    proj_turret_bolt_metaid = read_dword(lookup_tag("proj", "vehicles\\c gun turret\\mp gun turret") + 12)
    --proj_ghost_bolt_metaid = read_dword(lookup_tag("proj", "vehicles\\ghost\\ghost bolt") + 12)
    --proj_tank_bullet_metaid = read_dword(lookup_tag("proj", "vehicles\\scorpion\\bullet") + 12)
    --proj_tank_shell_metaid = read_dword(lookup_tag("proj", "vehicles\\scorpion\\tank shell") + 12)
    --proj_warthog_bullet_metaid = read_dword(lookup_tag("proj", "vehicles\\warthog\\bullet") + 12)
    --proj_assault_bullet_metaid = read_dword(lookup_tag("proj", "weapons\\assault rifle\\bullet") + 12)
    proj_flame_metaid = read_dword(lookup_tag("proj", "weapons\\flamethrower\\flame") + 12)
    --proj_needle_metaid = read_dword(lookup_tag("proj", "weapons\\needler\\mp_needle") + 12)
    --proj_pistol_bullet_metaid = read_dword(lookup_tag("proj", "weapons\\pistol\\bullet") + 12)
    --proj_plasma_pistol_bolt_metaid = read_dword(lookup_tag("proj", "weapons\\plasma pistol\\bolt") + 12)
    --proj_plasma_pistol_charge_metaid = read_dword(lookup_tag("proj", "weapons\\plasma rifle\\charged bolt") + 12)
    --proj_plasma_rifle_bolt_metaid = read_dword(lookup_tag("proj", "weapons\\plasma rifle\\bolt") + 12)
    --proj_fuelrod_metaid = read_dword(lookup_tag("proj", "weapons\\plasma_cannon\\plasma_cannon") + 12)
    --proj_rocket_metaid = read_dword(lookup_tag("proj", "weapons\\rocket launcher\\rocket") + 12)
    --proj_shotgun_pellet_metaid = read_dword(lookup_tag("proj", "weapons\\shotgun\\pellet") + 12)
    --proj_sniper_bullet_metaid = read_dword(lookup_tag("proj", "weapons\\sniper rifle\\sniper bullet") + 12)
    --bipd_campaign_biped_metaid = read_dword(lookup_tag("bipd", "characters\\cyborg\\cyborg") + 12)
    --bipd_mp_biped_metaid = read_dword(lookup_tag("bipd", "characters\\cyborg_mp\\cyborg_mp") + 12)
end

-- Created by H® Shaft with thanks to sehé°° and 002
-- Visit http://halorace.org/forum/index.php