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-rw-r--r--LICENCE1
-rwxr-xr-xcompile1
-rw-r--r--compile.bat1
-rw-r--r--dist/LICENCE.linux1
-rw-r--r--dist/LICENCE.windows1
-rw-r--r--gamedata/engine.kv20
-rw-r--r--src/fastfwd.c249
-rw-r--r--src/fastfwd.h29
8 files changed, 303 insertions, 0 deletions
diff --git a/LICENCE b/LICENCE
index e4421ee..54a7c8b 100644
--- a/LICENCE
+++ b/LICENCE
@@ -3,6 +3,7 @@ Except where otherwise noted, the following terms apply:
Copyright © 2023 Michael Smith <mikesmiffy128@gmail.com>
Copyright © 2023 Willian Henrique <wsimanbrazil@yahoo.com.br>
Copyright © 2023 Hayden K <imaciidz@gmail.com>
+Copyright © 2023 Matthew Wozniak <sirtomato999@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
diff --git a/compile b/compile
index e5852d2..f98f565 100755
--- a/compile
+++ b/compile
@@ -64,6 +64,7 @@ src="\
ent.c
errmsg.c
extmalloc.c
+ fastfwd.c
fixes.c
fov.c
gamedata.c
diff --git a/compile.bat b/compile.bat
index 98fedbd..fb635ba 100644
--- a/compile.bat
+++ b/compile.bat
@@ -72,6 +72,7 @@ setlocal DisableDelayedExpansion
:+ ent.c
:+ errmsg.c
:+ extmalloc.c
+:+ fastfwd.c
:+ fixes.c
:+ fov.c
:+ gamedata.c
diff --git a/dist/LICENCE.linux b/dist/LICENCE.linux
index fc691d0..81425f8 100644
--- a/dist/LICENCE.linux
+++ b/dist/LICENCE.linux
@@ -3,6 +3,7 @@ Source Speedrun Tools is released under the following copyright licence:
Copyright © 2023 Michael Smith <mikesmiffy128@gmail.com>
Copyright © 2023 Willian Henrique <wsimanbrazil@yahoo.com.br>
Copyright © 2023 Hayden K <imaciidz@gmail.com>
+Copyright © 2023 Matthew Wozniak <sirtomato999@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
diff --git a/dist/LICENCE.windows b/dist/LICENCE.windows
index e186fbc..020e48a 100644
--- a/dist/LICENCE.windows
+++ b/dist/LICENCE.windows
@@ -3,6 +3,7 @@ Source Speedrun Tools is released under the following copyright licence:
Copyright © 2023 Michael Smith <mikesmiffy128@gmail.com>
Copyright © 2023 Willian Henrique <wsimanbrazil@yahoo.com.br>
Copyright © 2023 Hayden K <imaciidz@gmail.com>
+Copyright © 2023 Matthew Wozniak <sirtomato999@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
diff --git a/gamedata/engine.kv b/gamedata/engine.kv
index 829e9e8..d8d51ca 100644
--- a/gamedata/engine.kv
+++ b/gamedata/engine.kv
@@ -105,4 +105,24 @@ vtidx_VGuiIsInitialized { // likewise, function is just called IsInitialized()
L4Dbased "7 + NVDTOR"
}
+// CDedicatedServerAPI
+vtidx_RunFrame 7
+
+// IEngine
+vtidx_Frame "4 + NVDTOR"
+
+// CEngineTool
+vtidx_GetRealTime {
+ default 34 // HL2, P1, L4D1, BMS
+ // OE, DMoMM 24
+ L4D2 35
+ Portal2 36
+}
+vtidx_HostFrameTime {
+ default 35
+ // OE, DMoMM 25
+ L4D2 38
+ Portal2 39
+}
+
// vi: sw=4 ts=4 noet tw=80 cc=80 ft=text
diff --git a/src/fastfwd.c b/src/fastfwd.c
new file mode 100644
index 0000000..b3098d4
--- /dev/null
+++ b/src/fastfwd.c
@@ -0,0 +1,249 @@
+/*
+ * Copyright © 2023 Matthew Wozniak <sirtomato999@gmail.com>
+ * Copyright © 2023 Michael Smith <mikesmiffy128@gmail.com>
+ * Copyright © 2023 Willian Henrique <wsimanbrazil@yahoo.com.br>
+ *
+ * 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 <stdlib.h>
+
+#include "con_.h"
+#include "engineapi.h"
+#include "errmsg.h"
+#include "gamedata.h"
+#include "gametype.h"
+#include "feature.h"
+#include "hook.h"
+#include "intdefs.h"
+#include "mem.h"
+#include "os.h"
+#include "ppmagic.h"
+#include "sst.h"
+#include "x86.h"
+#include "x86util.h"
+
+FEATURE()
+REQUIRE_GAMEDATA(vtidx_RunFrame)
+REQUIRE_GAMEDATA(vtidx_Frame)
+REQUIRE_GAMEDATA(vtidx_GetRealTime)
+REQUIRE_GAMEDATA(vtidx_HostFrameTime)
+
+typedef void (*Host_AccumulateTime_func)(float dt);
+static Host_AccumulateTime_func orig_Host_AccumulateTime;
+static float *realtime, *host_frametime;
+
+static float skiptime = 0.0, skiprate;
+static void hook_Host_AccumulateTime(float dt) {
+ float skipinc = skiprate * dt;
+ if (skiptime > skipinc) {
+ skiptime -= skipinc;
+ *realtime += skipinc;
+ *host_frametime = skipinc;
+ }
+ else if (skiptime > 0) {
+ *realtime += skiptime;
+ *host_frametime = skiptime;
+ skiptime = 0;
+ }
+ else {
+ orig_Host_AccumulateTime(dt);
+ }
+}
+
+void fastfwd(float seconds, float timescale) {
+ skiptime = seconds;
+ skiprate = timescale;
+}
+
+static inline void *find_eng(void *runframe) {
+#ifdef _WIN32
+ const uchar *insns = (const uchar *)runframe;
+ // RunFrame() first calls a virtual function on `eng`, the CEngine global.
+ // Look for the load of `this` into ECX.
+ for (const uchar *p = insns; p - insns < 32;) {
+ // mov ecx, dword ptr [this]
+ if (p[0] == X86_MOVRMW && p[1] == X86_MODRM(0, 1, 5)) {
+ void **indirect = mem_loadptr(p + 2);
+ return *indirect;
+ }
+ NEXT_INSN(p, "eng global object");
+ }
+#else
+#warning TODO(linux): yet another assembly thing
+#endif
+ return 0;
+}
+
+static inline void *find_HostState_Frame(void *Frame) {
+#ifdef _WIN32
+ // Frame() calls HostState_Frame in a small switch which the compiler just
+ // turns into a conditional branch. Find a cmp with a call after it.
+ const uchar *insns = (const uchar *)Frame;
+ for (const uchar *p = insns; p - insns < 640;) {
+ if (p[0] == X86_ALUMI8S && (p[1] & 0x38) == X86_MODRM(0, 7, 0) &&
+ p[2] == 2) {
+ NEXT_INSN(p, "HostState_Frame");
+ while (p - insns < 640) {
+ if (p[0] == X86_CALL) {
+ return (uchar *)p + 5 + mem_loadoffset(p + 1);
+ }
+ NEXT_INSN(p, "HostState_Frame");
+ }
+ return 0;
+ }
+ NEXT_INSN(p, "HostState_Frame");
+ }
+#else
+#warning TODO(linux): yet another assembly thing
+#endif
+ return 0;
+}
+
+static inline void *find_FrameUpdate(void *HostState_Frame) {
+#ifdef _WIN32
+ // HostState_Frame() calls another non-virtual member function (FrameUpdate)
+ const uchar *insns = (const uchar *)HostState_Frame;
+ for (const uchar *p = insns; p - insns < 384;) {
+ if (p[0] == X86_CALL) return (uchar *)p + 5 + mem_loadoffset(p + 1);
+ NEXT_INSN(p, "CHostState::FrameUpdate");
+ }
+#else
+#warning TODO(linux): yet another assembly thing
+#endif
+ return 0;
+}
+
+static inline bool find_Host_AccumulateTime(void *_Host_RunFrame) {
+#ifdef _WIN32
+ const uchar *insns = (const uchar *)_Host_RunFrame;
+ for (const uchar *p = insns; p - insns < 384;) {
+ if (p[0] == X86_FLTBLK2 && p[1] == X86_MODRM(1, 0, 5) && p[2] == 8) {
+ NEXT_INSN(p, "Host_AccumulateTime");
+ while (p - insns < 384) {
+ if (p[0] == X86_CALL) {
+ orig_Host_AccumulateTime = (Host_AccumulateTime_func)(
+ p + 5 + mem_loadoffset(p + 1));
+ return true;
+ }
+ NEXT_INSN(p, "Host_AccumulateTime");
+ }
+ return false;
+ }
+ NEXT_INSN(p, "Host_AccumulateTime");
+ }
+ return false;
+#else
+#warning TODO(linux): yet another assembly thing
+#endif
+}
+
+// we can find some float globals with functions that return them immediately
+// FLD dword ptr [floatvar]
+static inline float *find_float(void *func) {
+ // TODO(linux): this one might be okay - but still check!
+ const uchar *insn = (const uchar *)func;
+ if (insn[0] != X86_FLTBLK2 || insn[1] != 0x05) return 0;
+ else return mem_loadptr(insn + 2);
+}
+
+// a few layers of the call stack have the target function take a float arg,
+// so we can look for a particular number of FLD instructions followed by a CALL
+// and then grab the function from that
+static void *find_floatcall(void *func, int fldcnt, const char *name) {
+ // TODO(linux): likewise this has a chance of working, but needs testing
+ const uchar *insns = (const uchar *)func;
+ for (const uchar *p = insns; p - insns < 384;) {
+ if (p[0] == X86_FLTBLK2 && (p[1] & 0x38) == 0) {
+ NEXT_INSN(p, name);
+ while (p - insns < 384) {
+ if (p[0] == X86_CALL) {
+ if (!--fldcnt) return (uchar *)p + 5 + mem_loadoffset(p + 1);
+ goto next;
+ }
+ NEXT_INSN(p, name);
+ }
+ return false;
+ }
+next: NEXT_INSN(p, name);
+ }
+ return 0;
+}
+
+INIT {
+ void *hldsapi = factory_engine("VENGINE_HLDS_API_VERSION002", 0);
+ if (!hldsapi) {
+ errmsg_errorx("couldn't find HLDS API interface");
+ return false;
+ }
+ void *enginetool = factory_engine("VENGINETOOL003", 0);
+ if (!enginetool) {
+ errmsg_errorx("missing engine tool interface");
+ return false;
+ }
+ // behold: the greatest pointer chase of all time
+ realtime = find_float((*(void ***)enginetool)[vtidx_GetRealTime]);
+ if (!realtime) {
+ errmsg_errorx("couldn't find realtime variable");
+ return false;
+ }
+ host_frametime = find_float((*(void ***)enginetool)[vtidx_HostFrameTime]);
+ if (!host_frametime) {
+ errmsg_errorx("couldn't find host_frametime variable");
+ return false;
+ }
+ void *eng = find_eng((*(void ***)hldsapi)[vtidx_RunFrame]);
+ if (!eng) {
+ errmsg_errorx("couldn't find eng global object");
+ return false;
+ }
+ void *func;
+ if (!(func = find_HostState_Frame((*(void ***)eng)[vtidx_Frame]))) {
+ errmsg_errorx("couldn't find HostState_Frame function");
+ return false;
+ }
+ if (!(func = find_FrameUpdate(func))) {
+ errmsg_errorx("couldn't find FrameUpdate function");
+ return false;
+ }
+ if (!(func = find_floatcall(func, GAMETYPE_MATCHES(L4D2_2147plus) ? 2 : 1,
+ "CHostState::State_Run"))) {
+ errmsg_errorx("couldn't find State_Run function");
+ return false;
+ }
+ if (!(func = find_floatcall(func, 1, "Host_RunFrame"))) {
+ errmsg_errorx("couldn't find Host_RunFrame function");
+ return false;
+ }
+ if (!(func = find_floatcall(func, 1, "_Host_RunFrame"))) {
+ errmsg_errorx("couldn't find _Host_RunFrame");
+ return false;
+ }
+ if (!find_Host_AccumulateTime(func)) {
+ errmsg_errorx("couldn't find Host_AccumulateTime");
+ return false;
+ }
+ orig_Host_AccumulateTime = (Host_AccumulateTime_func)hook_inline(
+ (void *)orig_Host_AccumulateTime, (void *)hook_Host_AccumulateTime);
+ if (!orig_Host_AccumulateTime) {
+ errmsg_errorsys("couldn't hook Host_AccumulateTime function");
+ }
+ return true;
+}
+
+END {
+ if (!sst_userunloaded) return;
+ unhook_inline((void *)orig_Host_AccumulateTime);
+}
+
+// vi: sw=4 ts=4 noet tw=80 cc=80
diff --git a/src/fastfwd.h b/src/fastfwd.h
new file mode 100644
index 0000000..b24cfef
--- /dev/null
+++ b/src/fastfwd.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright © 2023 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.
+ */
+
+#ifndef INC_FASTFWD_H
+#define INC_FASTFWD_H
+
+/*
+ * Fast-forwards in-game time by a number of seconds, ignoring the usual
+ * host_framerate and host_timescale settings. timescale controls how many
+ * seconds of game pass per real-time second.
+ */
+void fastfwd(float seconds, float timescale);
+
+#endif
+
+// vi: sw=4 ts=4 noet tw=80 cc=80
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 23:25:57 +0000