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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.
*/
// TODO(linux): theoretically, probably ifdef out the cvar-replacement stuff; we
// expect any game that's been ported to linux to already have fov_desired
#include <stdbool.h>
#include "con_.h"
#include "engineapi.h"
#include "ent.h"
#include "gametype.h"
#include "hook.h"
#include "intdefs.h"
#include "mem.h"
#include "vcall.h"
#include "x86.h"
bool changedmax = false;
DEF_CVAR_MINMAX_UNREG(fov_desired,
"Set the base field of view (SST reimplementation)", 75, 75, 120,
CON_HIDDEN | CON_ARCHIVE)
static struct con_var *real_fov_desired; // engine's if it has it, or ours
typedef void (*VCALLCONV SetDefaultFOV_func)(void *, int);
static SetDefaultFOV_func orig_SetDefaultFOV;
static void VCALLCONV hook_SetDefaultFOV(void *this, int fov) {
// the game normally clamps fov_desired on the server side, disregard
// whatever it tries to set and force our own value instead
orig_SetDefaultFOV(this, con_getvari(real_fov_desired));
}
static bool find_SetDefaultFOV(struct con_cmd *fov) {
uchar *fovcb = (uchar *)fov->cb;
int callcnt = 0;
for (uchar *p = fovcb; p - fovcb < 96;) {
// fov command source, and consequent asm, calls 4 functions, one of
// them virtual (i.e. via register). of the 3 direct calls,
// SetDefaultFOV is the third.
if (p[0] == X86_CALL && ++callcnt == 3) {
orig_SetDefaultFOV = (SetDefaultFOV_func)(p + 5 +
mem_loadoffset(p + 1));
return true;
}
int len = x86_len(p);
if (len == -1) {
con_warn("fov: find_SetDefaultFOV: unknown or invalid instruction\n");
return false;
}
p += len;
}
return true;
}
// replacement cvar needs to actively set player fov if in a map
static void fovcb(struct con_var *v) {
void *player = ent_get(1); // NOTE: singleplayer only!
if (player) orig_SetDefaultFOV(player, con_getvari(v));
}
// called by sst.c in ClientActive to ensure fov is applied on load
void fov_onload(void) {
if (real_fov_desired == fov_desired) {
void *player = ent_get(1); // "
if (player) orig_SetDefaultFOV(player, con_getvari(fov_desired));
}
}
static struct con_cmd *cmd_fov;
bool fov_init(bool has_ent) {
// could work for other games, but generally only portal 1 people want this
// (the rest of us consider this cheating and a problem for runs...)
if (!GAMETYPE_MATCHES(Portal1)) { return false; }
cmd_fov = con_findcmd("fov");
if (!cmd_fov) return false; // shouldn't really happen but just in case!
if (real_fov_desired = con_findvar("fov_desired")) {
// latest steampipe already goes up to 120 fov
if (real_fov_desired->parent->maxval == 120) return false;
real_fov_desired->parent->maxval = 120;
}
else {
if (!has_ent) return false;
con_reg(fov_desired);
real_fov_desired = fov_desired;
}
if (!find_SetDefaultFOV(cmd_fov)) {
con_warn("fov: couldn't find SetDefaultFOV function\n");
return false;
}
orig_SetDefaultFOV = (SetDefaultFOV_func)hook_inline(
(void *)orig_SetDefaultFOV, (void *)&hook_SetDefaultFOV);
if (!orig_SetDefaultFOV) {
con_warn("fov: couldn't hook SetDefaultFOV function\n");
return false;
}
// we might not be using our cvar but simpler to do this unconditionally
fov_desired->cb = &fovcb;
fov_desired->parent->base.flags &= ~CON_HIDDEN;
// hide the original fov command since we've effectively broken it anyway :)
cmd_fov->base.flags |= CON_DEVONLY;
return true;
}
void fov_end(void) {
if (real_fov_desired && real_fov_desired != fov_desired) {
real_fov_desired->parent->maxval = 90;
if (con_getvarf(real_fov_desired) > 90) {
con_setvarf(real_fov_desired, 90); // blegh.
}
}
else {
void *player = ent_get(1); // also singleplayer only
if (player) orig_SetDefaultFOV(player, 75);
}
unhook_inline((void *)orig_SetDefaultFOV);
cmd_fov->base.flags &= ~CON_DEVONLY;
}
// vi: sw=4 ts=4 noet tw=80 cc=80
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