minecraft-pi-reborn/mods/src/game_mode/game_mode.cpp

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#include <libreborn/libreborn.h>
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#include "game_mode.h"
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#include <libreborn/minecraft.h>
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// Get Minecraft From Screen
static unsigned char *get_minecraft_from_screen(unsigned char *screen) {
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return *(unsigned char **) (screen + Screen_minecraft_property_offset);
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}
// Redirect Create World Button To SimpleLevelChooseScreen
#define WORLD_NAME "world"
static void SelectWorldScreen_tick_injection(unsigned char *screen) {
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bool create_world = *(bool *) (screen + SelectWorldScreen_should_create_world_property_offset);
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if (create_world) {
// Get New World Name
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std::string new_name = (*SelectWorldScreen_getUniqueLevelName)(screen, WORLD_NAME);
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// Create SimpleLevelChooseScreen
unsigned char *new_screen = (unsigned char *) ::operator new(SIMPLE_LEVEL_CHOOSE_SCREEN_SIZE);
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ALLOC_CHECK(new_screen);
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(*SimpleChooseLevelScreen)(new_screen, new_name);
// Set Screen
unsigned char *minecraft = get_minecraft_from_screen(screen);
(*Minecraft_setScreen)(minecraft, new_screen);
// Finish
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*(bool *) (screen + SelectWorldScreen_world_created_property_offset) = true;
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} else {
(*SelectWorldScreen_tick)(screen);
}
}
static void Touch_SelectWorldScreen_tick_injection(unsigned char *screen) {
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bool create_world = *(bool *) (screen + Touch_SelectWorldScreen_should_create_world_property_offset);
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if (create_world) {
// Get New World Name
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std::string new_name = (*Touch_SelectWorldScreen_getUniqueLevelName)(screen, WORLD_NAME);
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// Create SimpleLevelChooseScreen
unsigned char *new_screen = (unsigned char *) ::operator new(SIMPLE_LEVEL_CHOOSE_SCREEN_SIZE);
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ALLOC_CHECK(new_screen);
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(*SimpleChooseLevelScreen)(new_screen, new_name);
// Set Screen
unsigned char *minecraft = get_minecraft_from_screen(screen);
(*Minecraft_setScreen)(minecraft, new_screen);
// Finish
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*(bool *) (screen + Touch_SelectWorldScreen_world_created_property_offset) = true;
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} else {
(*Touch_SelectWorldScreen_tick)(screen);
}
}
void init_game_mode_cpp() {
// Hijack Create World Button
patch_address(SelectWorldScreen_tick_vtable_addr, (void *) SelectWorldScreen_tick_injection);
patch_address(Touch_SelectWorldScreen_tick_vtable_addr, (void *) Touch_SelectWorldScreen_tick_injection);
// Make The SimpleChooseLevelScreen Back Button Go To SelectWorldScreen Instead Of StartMenuScreen
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unsigned char simple_choose_level_screen_back_button_patch[4] = {0x05, 0x10, 0xa0, 0xe3}; // "mov r1, #0x5"
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patch((void *) 0x31144, simple_choose_level_screen_back_button_patch);
}