iw4x-client/src/Components/Modules/Movement.cpp

#include <STDInclude.hpp>

namespace Components
{
    Dvar::Var Movement::PlayerSpectateSpeedScale;
    Dvar::Var Movement::CGUfoScaler;
    Dvar::Var Movement::CGNoclipScaler;
    Dvar::Var Movement::BGBouncesAllAngles;
    Dvar::Var Movement::BGRocketJump;
    Dvar::Var Movement::BGPlayerEjection;
    Dvar::Var Movement::BGPlayerCollision;
    Game::dvar_t* Movement::BGBounces;
    Game::dvar_t* Movement::PlayerDuckedSpeedScale;
    Game::dvar_t* Movement::PlayerProneSpeedScale;

    __declspec(naked) void Movement::PM_PlayerDuckedSpeedScaleStub()
    {
        __asm
        {
            push eax
            mov eax, Movement::PlayerDuckedSpeedScale
            fld dword ptr [eax + 0x10] // dvar_t.current.value
            pop eax

            // Game's code
            pop ecx
            ret
        }
    }

    __declspec(naked) void Movement::PM_PlayerProneSpeedScaleStub()
    {
        __asm
        {
            push eax
            mov eax, Movement::PlayerProneSpeedScale
            fld dword ptr [eax + 0x10] // dvar_t.current.value
            pop eax

            // Game's code
            pop ecx
            ret
        }
    }

    float Movement::PM_MoveScale(Game::playerState_s* ps, float fmove,
        float rmove, float umove)
    {
        assert(ps != nullptr);

        auto max = std::fabsf(fmove) < std::fabsf(rmove)
            ? std::fabsf(rmove) : std::fabsf(fmove);

        if (std::fabsf(umove) > max)
        {
            max = std::fabsf(umove);
        }

        if (max == 0.0f)
        {
            return 0.0f;
        }   

        auto total = std::sqrtf(fmove * fmove
            + rmove * rmove + umove * umove);
        auto scale = (static_cast<float>(ps->speed) * max) / (127.0f * total);

        if (ps->pm_flags & Game::PMF_WALKING || ps->leanf != 0.0f)
        {
            scale *= 0.4f;
        }

        switch (ps->pm_type)
        {
        case Game::pmtype_t::PM_NOCLIP:
            scale *= Movement::CGNoclipScaler.get<float>();
            break;
        case Game::pmtype_t::PM_UFO:
            scale *= Movement::CGUfoScaler.get<float>();
            break;
        case Game::pmtype_t::PM_SPECTATOR:
            scale *= Movement::PlayerSpectateSpeedScale.get<float>();
            break;
        default:
            break;
        }

        return scale;
    }

    __declspec(naked) void Movement::PM_MoveScaleStub()
    {
        __asm
        {
            pushad

            push [esp + 0xC + 0x20] // umove
            push [esp + 0xC + 0x20] // rmove
            push [esp + 0xC + 0x20] // fmove
            push esi // ps
            call Movement::PM_MoveScale
            add esp, 0x10

            popad
            ret
        }
    }

    __declspec(naked) void Movement::PM_StepSlideMoveStub()
    {
        __asm
        {
            // Check the value of BGBounces
            push ecx
            push eax

            mov eax, Movement::BGBounces
            mov ecx, dword ptr [eax + 0x10]
            test ecx, ecx

            pop eax
            pop ecx

            // Do not bounce if BGBounces is 0
            jle noBounce

            // Bounce
            push 0x4B1B34
            retn

        noBounce:
            // Original game code
            cmp dword ptr [esp + 0x24], 0
            push 0x4B1B48
            retn
        }
    }

    void Movement::PM_ProjectVelocityStub(const float* velIn, const float* normal, float* velOut)
    {
        const auto lengthSquared2D = velIn[0] * velIn[0] + velIn[1] * velIn[1];

        if (std::fabsf(normal[2]) < 0.001f || lengthSquared2D == 0.0)
        {
            velOut[0] = velIn[0];
            velOut[1] = velIn[1];
            velOut[2] = velIn[2];
            return;
        }

        auto newZ = velIn[0] * normal[0] + velIn[1] * normal[1];
        newZ = -newZ / normal[2];
        const auto lengthScale = std::sqrtf((velIn[2] * velIn[2] + lengthSquared2D)
                / (newZ * newZ + lengthSquared2D));

        if (Movement::BGBouncesAllAngles.get<bool>()
            || (lengthScale < 1.f || newZ < 0.f || velIn[2] > 0.f))
        {
            velOut[0] = velIn[0] * lengthScale;
            velOut[1] = velIn[1] * lengthScale;
            velOut[2] = newZ * lengthScale;
        }
    }

    // Double bounces
    void Movement::Jump_ClearState_Hk(Game::playerState_s* ps)
    {
        if (Movement::BGBounces->current.integer != Movement::DOUBLE)
        {
            Game::Jump_ClearState(ps);
        }
    }

    Game::gentity_s* Movement::Weapon_RocketLauncher_Fire_Hk(Game::gentity_s* ent, unsigned int weaponIndex,
        float spread, Game::weaponParms* wp, const float* gunVel, Game::lockonFireParms* lockParms, bool a7)
    {
        auto* result = Game::Weapon_RocketLauncher_Fire(ent, weaponIndex, spread, wp, gunVel, lockParms, a7);

        if (ent->client != nullptr && BGRocketJump.get<bool>())
        {
            ent->client->ps.velocity[0] += (0.0f - wp->forward[0]) * 64.0f;
            ent->client->ps.velocity[1] += (0.0f - wp->forward[1]) * 64.0f;
            ent->client->ps.velocity[2] += (0.0f - wp->forward[2]) * 64.0f;
        }

        return result;
    }

    int Movement::StuckInClient_Hk(Game::gentity_s* self)
    {
        if (Movement::BGPlayerEjection.get<bool>())
        {
            return Utils::Hook::Call<int(Game::gentity_s*)>(0x402D30)(self); // StuckInClient
        }

        return 0;
    }

    void Movement::CM_TransformedCapsuleTrace_Hk(Game::trace_t* results, const float* start, const float* end,
        const Game::Bounds* bounds, const Game::Bounds* capsule, int contents, const float* origin, const float* angles)
    {
        if (Movement::BGPlayerCollision.get<bool>())
        {
            Utils::Hook::Call<void(Game::trace_t*, const float*, const float*,
                const Game::Bounds*, const Game::Bounds*, int, const float*, const float*)>
                (0x478300)
                (results, start, end, bounds, capsule, contents, origin, angles); // CM_TransformedCapsuleTrace
        }
    }

    Game::dvar_t* Movement::Dvar_RegisterSpectateSpeedScale(const char* dvarName, float value,
        float min, float max, unsigned __int16 /*flags*/, const char* description)
    {
        Movement::PlayerSpectateSpeedScale = Dvar::Register<float>(dvarName, value,
            min, max, Game::DVAR_CHEAT | Game::DVAR_CODINFO, description);

        return Movement::PlayerSpectateSpeedScale.get<Game::dvar_t*>();
    }

    Movement::Movement()
    {
        Dvar::OnInit([]
        {
            static const char* bg_bouncesValues[] =
            {
                "disabled",
                "enabled",
                "double",
                nullptr
            };

            Movement::PlayerDuckedSpeedScale = Game::Dvar_RegisterFloat("player_duckedSpeedScale",
                0.65f, 0.0f, 5.0f, Game::DVAR_CHEAT | Game::DVAR_CODINFO,
                "The scale applied to the player speed when ducking");

            Movement::PlayerProneSpeedScale = Game::Dvar_RegisterFloat("player_proneSpeedScale",
                0.15f, 0.0f, 5.0f, Game::DVAR_CHEAT | Game::DVAR_CODINFO,
                "The scale applied to the player speed when crawling");

            // 3arc naming convention
            Movement::CGUfoScaler = Dvar::Register<float>("cg_ufo_scaler",
                6.0f, 0.001f, 1000.0f, Game::DVAR_CHEAT | Game::DVAR_CODINFO,
                "The speed at which ufo camera moves");

            Movement::CGNoclipScaler = Dvar::Register<float>("cg_noclip_scaler",
                3.0f, 0.001f, 1000.0f, Game::DVAR_CHEAT | Game::DVAR_CODINFO,
                "The speed at which noclip camera moves");

            Movement::BGBounces = Game::Dvar_RegisterEnum("bg_bounces",
                bg_bouncesValues, Movement::DISABLED, Game::DVAR_CODINFO, "Bounce glitch settings");

            Movement::BGBouncesAllAngles = Dvar::Register<bool>("bg_bouncesAllAngles",
                false, Game::DVAR_CODINFO, "Force bounce from all angles");

            Movement::BGRocketJump = Dvar::Register<bool>("bg_rocketJump",
                false, Game::DVAR_CODINFO, "Enable CoD4 rocket jumps");

            Movement::BGPlayerEjection = Dvar::Register<bool>("bg_playerEjection",
                true, Game::DVAR_CODINFO, "Push intersecting players away from each other");

            Movement::BGPlayerCollision = Dvar::Register<bool>("bg_playerCollision",
                true, Game::DVAR_CODINFO, "Push intersecting players away from each other");
        });

        // Hook Dvar_RegisterFloat. Only thing that's changed is that the 0x80 flag is not used.
        Utils::Hook(0x448990, Movement::Dvar_RegisterSpectateSpeedScale, HOOK_CALL).install()->quick();

        // PM_CmdScaleForStance
        Utils::Hook(0x572D9B, Movement::PM_PlayerDuckedSpeedScaleStub, HOOK_JUMP).install()->quick();
        Utils::Hook(0x572DA5, Movement::PM_PlayerProneSpeedScaleStub, HOOK_JUMP).install()->quick();

        // Hook PM_MoveScale so we can add custom speed scale for Ufo and Noclip
        Utils::Hook(0x56F845, Movement::PM_MoveScaleStub, HOOK_CALL).install()->quick();
        Utils::Hook(0x56FABD, Movement::PM_MoveScaleStub, HOOK_CALL).install()->quick();

        // Bounce logic
        Utils::Hook(0x4B1B2D, Movement::PM_StepSlideMoveStub, HOOK_JUMP).install()->quick();
        Utils::Hook(0x57383E, Movement::Jump_ClearState_Hk, HOOK_CALL).install()->quick();
        Utils::Hook(0x4B1B97, Movement::PM_ProjectVelocityStub, HOOK_CALL).install()->quick();

        // Rocket jump
        Utils::Hook(0x4A4F9B, Movement::Weapon_RocketLauncher_Fire_Hk, HOOK_CALL).install()->quick(); //  FireWeapon        

        // Hook StuckInClient & CM_TransformedCapsuleTrace 
        // so we can prevent intersecting players from being pushed away from each other
        Utils::Hook(0x5D8153, Movement::StuckInClient_Hk, HOOK_CALL).install()->quick();
        Utils::Hook(0x45A5BF, Movement::CM_TransformedCapsuleTrace_Hk, HOOK_CALL).install()->quick(); // SV_ClipMoveToEntity
        Utils::Hook(0x5A0CAD, Movement::CM_TransformedCapsuleTrace_Hk, HOOK_CALL).install()->quick(); // CG_ClipMoveToEntity
    }
}