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/*
* Copyright © 2022 Michael Smith <mikesmiffy128@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdbool.h>
#include "con_.h"
#include "engineapi.h"
#include "errmsg.h"
#include "gamedata.h"
#include "gametype.h"
#include "intdefs.h"
#include "hook.h"
#include "mem.h"
#include "os.h"
#include "vcall.h"
DEF_CVAR(sst_autojump, "Jump upon hitting the ground while holding space", 0,
CON_REPLICATE | CON_DEMO | CON_HIDDEN)
#define IN_JUMP 2
#define NIDX 256 // *completely* arbitrary lol
static bool justjumped[NIDX] = {0};
static inline int handleidx(ulong h) { return h & (1 << 11) - 1; }
static void *gmsv = 0, *gmcl = 0;
typedef bool (*VCALLCONV CheckJumpButton_func)(void *);
static CheckJumpButton_func origsv, origcl;
static bool VCALLCONV hooksv(void *this) {
struct CMoveData *mv = mem_loadptr(mem_offset(this, off_mv));
int idx = handleidx(mv->playerhandle);
if (con_getvari(sst_autojump) && mv->firstrun && !justjumped[idx]) {
mv->oldbuttons &= ~IN_JUMP;
}
bool ret = origsv(this);
if (mv->firstrun) justjumped[idx] = ret;
return ret;
}
static bool VCALLCONV hookcl(void *this) {
struct CMoveData *mv = mem_loadptr(mem_offset(this, off_mv));
// FIXME: this will stutter in the rare case where justjumped is true.
// currently doing clientside justjumped handling makes multiplayer
// prediction in general wrong, so this'll need more work to do totally
// properly.
//if (con_getvari(sst_autojump) && !justjumped[0]) mv->oldbuttons &= ~IN_JUMP;
if (con_getvari(sst_autojump)) mv->oldbuttons &= ~IN_JUMP;
return justjumped[0] = origcl(this);
}
static bool unprot(void *gm) {
void **vtable = *(void ***)gm;
bool ret = os_mprot(vtable + vtidx_CheckJumpButton, sizeof(void *),
PAGE_READWRITE);
if (!ret) errmsg_errorsys("couldn't make virtual table writable");
return ret;
}
bool autojump_init(void) {
// TODO(featgen): auto-check these factories
if (!factory_client || !factory_server) {
errmsg_warnx("missing required factories");
return false;
}
if (!has_vtidx_CheckJumpButton || !has_off_mv) {
errmsg_warnx("missing gamedata entries for this engine");
return false;
}
gmsv = factory_server("GameMovement001", 0);
if (!gmsv) {
errmsg_errorx("couldn't get server-side game movement interface");
return false;
}
if (!unprot(gmsv)) return false;
gmcl = factory_client("GameMovement001", 0);
if (!gmcl) {
errmsg_errorx("couldn't get client-side game movement interface");
return false;
}
if (!unprot(gmcl)) return false;
origsv = (CheckJumpButton_func)hook_vtable(*(void ***)gmsv,
vtidx_CheckJumpButton, (void *)&hooksv);
origcl = (CheckJumpButton_func)hook_vtable(*(void ***)gmcl,
vtidx_CheckJumpButton, (void *)&hookcl);
sst_autojump->base.flags &= ~CON_HIDDEN;
if (GAMETYPE_MATCHES(Portal1)) {
// this is a stupid, stupid policy that doesn't make any sense, but I've
// tried arguing about it already and with how long it takes to convince
// the Portal guys of anything I'd rather concede for now and maybe try
// and revert this later if anyone eventually decides to be sensible.
// the alternative is nobody's allowed to use SST in runs - except of
// course the couple of people who just roll the dice anyway, and
// thusfar haven't actually been told to stop. yeah, whatever.
sst_autojump->base.flags |= CON_CHEAT;
}
return true;
}
void autojump_end(void) {
unhook_vtable(*(void ***)gmsv, vtidx_CheckJumpButton, (void *)origsv);
unhook_vtable(*(void ***)gmcl, vtidx_CheckJumpButton, (void *)origcl);
}
// vi: sw=4 ts=4 noet tw=80 cc=80
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