79 lines
2.9 KiB
C
79 lines
2.9 KiB
C
#include "game-mode.h"
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#include "../init/init.h"
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#include "../feature/feature.h"
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#include <libreborn/libreborn.h>
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#include <symbols/minecraft.h>
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static int is_survival = -1;
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// Patch Game Mode
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static void set_is_survival(int new_is_survival) {
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if (is_survival != new_is_survival) {
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INFO("Setting Game Mode: %s", new_is_survival ? "Survival" : "Creative");
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// Correct Inventpry UI
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unsigned char inventory_patch[4] = {new_is_survival ? 0x00 : 0x01, 0x30, 0xa0, 0xe3}; // "mov r3, #0x0" or "mov r3, #0x1"
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patch((void *) 0x16efc, inventory_patch);
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// Use Correct Size For GameMode Object
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unsigned char size_patch[4] = {new_is_survival ? SURVIVAL_MODE_SIZE : CREATOR_MODE_SIZE, 0x00, 0xa0, 0xe3}; // "mov r0, #SURVIVAL_MODE_SIZE" or "mov r0, #CREATOR_MODE_SIZE"
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patch((void *) 0x16ee4, size_patch);
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// Replace Default CreatorMode Constructor With CreatorMode Or SurvivalMode Constructor
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overwrite_call((void *) 0x16ef4, new_is_survival ? SurvivalMode : CreatorMode);
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is_survival = new_is_survival;
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}
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}
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// Handle Gamemode Switching
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static void Minecraft_setIsCreativeMode_injection(unsigned char *this, int32_t new_game_mode) {
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set_is_survival(!new_game_mode);
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// Call Original Method
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(*Minecraft_setIsCreativeMode)(this, new_game_mode);
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}
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// Disable CreatorMode-Specific API Features (Polling Block Hits) In SurvivalMode, This Is Preferable To Crashing
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static unsigned char *Minecraft_getCreator_injection(unsigned char *minecraft) {
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if (is_survival) {
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// SurvivalMode, Return NULL
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return NULL;
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} else {
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// CreatorMode, Call Original Method
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return (*Minecraft_getCreator)(minecraft);
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}
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}
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// Init
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void init_game_mode() {
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// Dynamic Game Mode Switching
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if (feature_has("Implement Game-Mode Switching", server_enabled)) {
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set_is_survival(1);
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overwrite_calls((void *) Minecraft_setIsCreativeMode, (void *) Minecraft_setIsCreativeMode_injection);
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// Replace CreatorLevel With ServerLevel (This Fixes Beds And Mob Spawning)
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overwrite_call((void *) 0x16f84, (void *) ServerLevel);
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// Allocate Correct Size For ServerLevel
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uint32_t level_size = SERVER_LEVEL_SIZE;
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patch_address((void *) 0x17004, (void *) level_size);
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// Disable CreatorMode-Specific API Features (Polling Block Hits) In SurvivalMode, This Is Preferable To Crashing
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overwrite_calls((void *) Minecraft_getCreator, (void *) Minecraft_getCreator_injection);
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}
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// Create World Dialog
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if (feature_has("Implement Create World Dialog", server_disabled)) {
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// Init UI
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_init_game_mode_ui();
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}
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// Allow Joining Survival Servers
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if (feature_has("Allow Joining Survival Servers", server_enabled)) {
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unsigned char server_patch[4] = {0x0f, 0x00, 0x00, 0xea}; // "b 0x6dcb4"
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patch((void *) 0x6dc70, server_patch);
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}
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}
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