Mid-Air Sprinting (#208)

This commit is contained in:
Andrew 2022-08-04 01:02:31 -05:00 committed by GitHub
parent d00f4831cd
commit f3d7685324
3 changed files with 52 additions and 0 deletions

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@ -266,6 +266,52 @@ namespace gameplay
vel_out[2] = new_z * length_scale;
}
}
void* pm_can_start_sprint_stub()
{
return utils::hook::assemble([=](utils::hook::assembler& a)
{
const auto skip_jz = a.newLabel();
const auto loc_2C98EF = a.newLabel();
// save rax's original value
a.push(rax);
// move dvar pointer to rax
a.mov(rax, qword_ptr(reinterpret_cast<uint64_t>(&dvars::pm_sprintInAir)));
// move *(rax + 16) into al
a.mov(al, byte_ptr(rax, 0x10));
// compare al with 1
a.cmp(al, 1);
// restore rax to its original value
a.pop(rax);
// jz == jump zero, jumps if the two operands in cmp are equal
a.jz(skip_jz); // skip the last cmp & jz
// execute original code at 0x2C98C0 & 0x2C98C6
// necessary because our jump overwrites 12 bytes after it
a.mov(eax, 0x7FF); // rax got overwritted by our long jump (it does mov rax, <jmpaddr>; jmp rax)
a.cmp(word_ptr(rbx, 0x22), ax);
a.jz(loc_2C98EF);
a.bind(skip_jz);
// execute original code from 0x2C98C6 to 0x2C98CC
a.mov(edx, dword_ptr(rdi, 0x8));
a.mov(rcx, rbx);
// the section of code that was overwritten by our jump is finished so we can jump back to the game code
a.jmp(0x2C98CC_b);
// original code
a.bind(loc_2C98EF);
a.jmp(0x2C98EF_b);
});
}
}
class component final : public component_interface
@ -307,6 +353,10 @@ namespace gameplay
utils::hook::jump(0x3FF812_b, client_end_frame_stub(), true);
utils::hook::nop(0x3FF808_b, 1);
dvars::pm_sprintInAir = dvars::register_bool("pm_sprintInAir", false,
game::DVAR_FLAG_REPLICATED, "Enable Mid-Air Sprinting");
utils::hook::jump(0x2C98C0_b, pm_can_start_sprint_stub(), true);
auto* timescale = dvars::register_float("timescale", 1.0f, 0.1f, 50.0f, game::DVAR_FLAG_REPLICATED, "Changes Timescale of the game");
utils::hook::inject(0x15B204_b, &timescale->current.value); // Com_GetTimeScale
utils::hook::inject(0x17D243_b, &timescale->current.value); // Com_Restart

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@ -32,6 +32,7 @@ namespace dvars
game::dvar_t* pm_bouncing = nullptr;
game::dvar_t* pm_bouncingAllAngles = nullptr;
game::dvar_t* pm_sprintInAir = nullptr;
game::dvar_t* jump_ladderPushVel = nullptr;

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@ -35,6 +35,7 @@ namespace dvars
extern game::dvar_t* pm_bouncing;
extern game::dvar_t* pm_bouncingAllAngles;
extern game::dvar_t* pm_sprintInAir;
extern game::dvar_t* jump_ladderPushVel;