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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 "gamedata.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 hook(void *this) {
struct CMoveData **mvp = mem_offset(this, off_mv), *mv = *mvp;
// use 0 idx for client side, as server indices start at 1
// FIXME: does this account for splitscreen???
int i = this == gmsv ? handleidx(mv->playerhandle) : 0;
if (con_getvari(sst_autojump) && !justjumped[i]) mv->oldbuttons &= ~IN_JUMP;
return justjumped[i] = (this == gmsv ? origsv : origcl)(this);
}
static bool unprot(void *gm) {
void **vtable = *(void ***)gm;
bool ret = os_mprot(vtable + vtidx_CheckJumpButton, sizeof(void *),
PAGE_EXECUTE_READWRITE);
if (!ret) con_warn("autojump: couldn't make memory writable\n");
return ret;
}
bool autojump_init(void) {
// TODO(featgen): auto-check these factories
if (!factory_client || !factory_server) {
con_warn("autojump: missing required factories\n");
return false;
}
if (!has_vtidx_CheckJumpButton || !has_off_mv) {
con_warn("autojump: missing gamedata entries for this engine\n");
return false;
}
gmsv = factory_server("GameMovement001", 0);
if (!gmsv) {
con_warn("autojump: couldn't get server-side game movement interface\n");
return false;
}
if (!unprot(gmsv)) return false;
gmcl = factory_client("GameMovement001", 0);
if (!gmcl) {
con_warn("autojump: couldn't get client-side game movement interface\n");
return false;
}
if (!unprot(gmcl)) return false;
origsv = (CheckJumpButton_func)hook_vtable(*(void ***)gmsv,
vtidx_CheckJumpButton, (void *)&hook);
origcl = (CheckJumpButton_func)hook_vtable(*(void ***)gmcl,
vtidx_CheckJumpButton, (void *)&hook);
sst_autojump->base.flags &= ~CON_HIDDEN;
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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