minecraft-pi-reborn/mods/src/game-mode/game-mode.c

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#include "game-mode-internal.h"
#include <mods/init/init.h>
#include <mods/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;
// Patch Game Mode
static void set_is_survival(int new_is_survival) {
if (is_survival != new_is_survival) {
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DEBUG("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);
// 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 ? (void *) SurvivalMode_constructor : (void *) CreatorMode_constructor);
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is_survival = new_is_survival;
}
}
// Handle Gamemode Switching
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static void Minecraft_setIsCreativeMode_injection(Minecraft *this, int32_t new_game_mode) {
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set_is_survival(!new_game_mode);
// Call Original Method
(*Minecraft_setIsCreativeMode)(this, new_game_mode);
}
// 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(Minecraft *minecraft) {
if (is_survival) {
// SurvivalMode, Return NULL
return NULL;
} else {
// CreatorMode, Call Original Method
return (*Minecraft_getCreator)(minecraft);
}
}
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// Init
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void init_game_mode() {
// 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_constructor);
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// Allocate Correct Size For ServerLevel
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
overwrite_calls((void *) Minecraft_getCreator, (void *) Minecraft_getCreator_injection);
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}
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// Create World Dialog
if (feature_has("Implement Create World Dialog", server_disabled)) {
// Init UI
_init_game_mode_ui();
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}
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// Allow Joining Survival Mode Servers
if (feature_has("Allow Joining Survival Mode Servers", server_enabled)) {
unsigned char server_patch[4] = {0x0f, 0x00, 0x00, 0xea}; // "b 0x6dcb4"
patch((void *) 0x6dc70, server_patch);
}
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}