disables shadows in acs.exe render pipeline for 1.14.4

acs_disable_shadows_patcher.go

package main

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

const VERSION = "0.1"

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() {
	info := &BinaryInfo{
		Version:        "1.14.4",
		FunctionOffset: 0x273ee0,
		Orig:           "c258a4b22b33fed749e530224b95f2aa8adfdeae2a0c8b894062f2be14010153",
		OrigOpcode:     0x48,
		Patched:        "245e935a356cdc2bb99c6ee007ea76b82bfb78709c8db4da8155db2b80d3d9ca",
		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)

	switch current {

	case info.Orig:
		fmt.Println(" * found original acs.exe\n * patching now..")
		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.Println(" * found patched acs.exe\n * reverting back to original..")
		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")

	default:
		fmt.Println("acs.exe version not supported (only 1.14.4 supported)")
	}
}