acs_disable_shadows_patcher.go

package main

import (
	"crypto/sha256"
	"fmt"
	"io/ioutil"
	"time"
)

const VERSION = "v0.9"

type BinaryInfo struct {
	Version        string
	FunctionOffset int
	Orig           string
	OrigOpcode     byte
	Patched        string
	PatchedOpcode  byte
}

func checksum(buf []byte) string {
	return fmt.Sprintf("%x", sha256.Sum256(buf))
}

func main() {
	versions := []BinaryInfo{
		BinaryInfo{
			Version:        "1.14",
			FunctionOffset: 0x273e40,
			Orig:           "b1a22daf22ce49623a2d779b0f224c6381c59c3166b000385127b5bf6522b8e8",
			OrigOpcode:     0x48,
			Patched:        "abb5feccd36f6f1af527a0f135271d88ffc72e1a0cad23aae1d59e35ce4d3f75",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.14.1",
			FunctionOffset: 0x274290,
			Orig:           "fb3fe0bb72ddeb98a873b0a3e46efb7c366a4fbe59c3a18baae072eed48388e8",
			OrigOpcode:     0x48,
			Patched:        "5eab91fcdaa0d5d3e55f49010154b98f7b828743df1efa3e7cd6dc137e733482",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.14.2",
			FunctionOffset: 0x273f90,
			Orig:           "27b73890099945b9bf597ed28afb322f87f03349d2bd619dab87bbce09e72178",
			OrigOpcode:     0x48,
			Patched:        "164db25ddc7c650e76403b3835eac0304849e7bc6350486df341f8693f991338",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.14.3",
			FunctionOffset: 0x274530,
			Orig:           "d7faa332adf9c4b123d0666d9ce0f56e3be06463d84193ba4a03f3216261d85d",
			OrigOpcode:     0x48,
			Patched:        "4e3267c1fb95c896006b8dc357b77438ad70b72cf12490f4b8653d2083640522",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.14.4",
			FunctionOffset: 0x273ee0,
			Orig:           "c258a4b22b33fed749e530224b95f2aa8adfdeae2a0c8b894062f2be14010153",
			OrigOpcode:     0x48,
			Patched:        "245e935a356cdc2bb99c6ee007ea76b82bfb78709c8db4da8155db2b80d3d9ca",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.15",
			FunctionOffset: 0x20bb60,
			Orig:           "7de3155a014618d6372cd6e309d1cab110cb02b84812f0a7b3adda10f28fa527",
			OrigOpcode:     0x48,
			Patched:        "aa7517e608e84a9575a21c47add8e7fe330a1afad4b800a256a15a56ad0716ea",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.15.1",
			FunctionOffset: 0x20bb60,
			Orig:           "0494054b0a4e4010aa4a73ea6a99f1555af888fd81a45f4a272388d9588719b8",
			OrigOpcode:     0x48,
			Patched:        "74b99fa7127baeb7af04bcecf4deeb63dab609dcd26d7d4143be14039603aa1f",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.15.2",
			FunctionOffset: 0x20bd40,
			Orig:           "37cea2d7fb63ae85c4452873c0298b6f2dcb11fefbc0c41a7944f31fd825bf6b",
			OrigOpcode:     0x48,
			Patched:        "0a1a4a147e4e50afba5f361040b37f015a2a3752084180e0dad6b8d4e61f497d",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.16",
			FunctionOffset: 0x20ca20,
			Orig:           "ddc498ff9b9f8a85b1ab7b803714c5e6483969bf00cb240c0b89f377b985aaa0",
			OrigOpcode:     0x48,
			Patched:        "b2501b16229eb2cbc137a4389b925337e2a62e1143faddad031219ae98815017",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.16.1",
			FunctionOffset: 0x20ca20,
			Orig:           "12ff76a2fc02e377cbe2f5e574be8a0abd9b2142f38306dc44c7c431ca9a74b1",
			OrigOpcode:     0x48,
			Patched:        "9fdbf07e9c751069533ff22067d01366acc7c53109454b9f366fb2b4be39b478",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.16.2",
			FunctionOffset: 0x20ca20,
			Orig:           "fcbda28dc363b5fdaf26ec02e79d94bd637048b7aa346611e51387646478e398",
			OrigOpcode:     0x48,
			Patched:        "edf87d99a2f4b4d7f9666ed628b6280b1b7672493290033cd266f416ebc61b91",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.16.3",
			FunctionOffset: 0x20caa0,
			Orig:           "ff458820f352faf141e6aafb4bdd85e327d45f51054c7950f224f1ad688c7718",
			OrigOpcode:     0x48,
			Patched:        "6d9b2b9a5e465bba979e201c01957bb124d43006d7a82bf8e914f42f7d52f6d5",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.16.4",
			FunctionOffset: 0x20caa0,
			Orig:           "7ceb48f70d76de7954e9270947c4827e44eb620eba6a09b8cec9e5291b41b5c9",
			OrigOpcode:     0x48,
			Patched:        "db2ba9c0adab8c45e487577ad064de05e657943ab8b816e6511b664cfed57ea8",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.16.4.v2 / Updated on 03-03-2021",
			FunctionOffset: 0x20caa0,
			Orig:           "365b0d25e79a2079b781ecaac2d262e38a92a89e2b0226fb98e64935c1356711",
			OrigOpcode:     0x48,
			Patched:        "a733024be03b4497753e35cdb94be61810a8b5a266af4aa90a0f7a03d2476cce",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.16.4.v3 / Updated on 21-04-2021",
			FunctionOffset: 0x20caa0,
			Orig:           "ab2663f7c15d4129929668960989d6f257b549ed0f23ebe8a06b7afdd36bb872",
			OrigOpcode:     0x48,
			Patched:        "0dc06babaf4ba1e2b5da204d37b59b479a36cf9f46e74c1717694b5a16c815fa",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.16.4.v4 / Updated on 05-05-2021",
			FunctionOffset: 0x20caa0,
			Orig:           "ed7b4432c0a634483d1640ef54fe22db577e3f20c048b425584e12787f78366a",
			OrigOpcode:     0x48,
			Patched:        "4da51adb6cea10759a69899cf64e0cbb21463cda8f889b26c52e62731f0e9a40",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.16.4.v5 / Updated on 29-06-2021",
			FunctionOffset: 0x20caa0,
			Orig:           "c8d588bc01e3e9bfddf3f0bd1f0664efa1d9236daf9ed179f34f590e4f962246",
			OrigOpcode:     0x48,
			Patched:        "d6e0532441934be2a678948374be7281f6799165cee6be8df424f248a3cc0ca0",
			PatchedOpcode:  0xc3,
		},
		BinaryInfo{
			Version:        "1.16.4.v6 / Updated on 14-06-2025",
			FunctionOffset: 0x20caa0,
			Orig:           "0df569c840f8303f7018f7891085e3a4c22cf93fb19327c6a0b85325cea23fd1",
			OrigOpcode:     0x48,
			Patched:        "78cf723ff7d07ab41f3aeefd2d6854fd05c2d7b7e9123fdbc632ff7b6137e99b",
			PatchedOpcode:  0xc3,
		},
	}

	filename := "acs.exe"

	buf, err := ioutil.ReadFile(filename)
	if err != nil {
		fmt.Println(err)
		return
	}

	fmt.Println("== Assetto Corsa Disable Shadows Patcher", VERSION)

	current := checksum(buf)

	var info BinaryInfo

	for _, i := range versions {
		if i.Orig == current || i.Patched == current {
			info = i
			break
		}
	}

	if info.Version == "" {
		fmt.Printf("acs.exe version not supported (only ")
		for _, i := range versions {
			fmt.Printf("[%s] ", i.Version)
		}
		fmt.Printf("supported)\n")
	} else {
		switch current {

		case info.Orig:
			fmt.Printf(" * found original acs.exe (version %s)\n * patching now..\n", info.Version)
			buf[info.FunctionOffset] = info.PatchedOpcode

			err = ioutil.WriteFile(filename, buf, 0755)
			if err != nil {
				fmt.Println(err)
				return
			}
			fmt.Println("= successfully patched")
			fmt.Println("\nrestart Assetto Corsa and enjoy VR without flickering shadows")

		case info.Patched:
			fmt.Printf(" * found patched acs.exe (version %s) \n * reverting back to original..\n", info.Version)
			buf[info.FunctionOffset] = info.OrigOpcode

			err = ioutil.WriteFile(filename, buf, 0755)
			if err != nil {
				fmt.Println(err)
				return
			}
			fmt.Println("= successfully reverted back to original acs.exe")
			fmt.Println("\nrestart Assetto Corsa and Shadows are rendered again")
		}
	}

	time.Sleep(1 * time.Minute)
}