minecraft-pi-docker/mods/src/touch/touch.cpp

#include <libreborn/libreborn.h>

#include "../feature/feature.h"
#include "../init/init.h"

#include <symbols/minecraft.h>

// Enable Touch GUI
static int32_t Minecraft_isTouchscreen_injection(__attribute__((unused)) unsigned char *minecraft) {
    return 1;
}

// IngameBlockSelectionScreen Memory Allocation Override
static unsigned char *operator_new_IngameBlockSelectionScreen_injection(__attribute__((unused)) uint32_t size) {
    return (unsigned char *) ::operator new(TOUCH_INGAME_BLOCK_SELECTION_SCREEN_SIZE);
}

// Init
void init_touch() {
    int touch_gui = feature_has("Touch GUI", server_disabled);
    if (touch_gui) {
        // Main UI
        overwrite((void *) Minecraft_isTouchscreen, (void *) Minecraft_isTouchscreen_injection);

        // Force Correct Toolbar Size
        unsigned char toolbar_patch[4] = {0x01, 0x00, 0x50, 0xe3}; // "cmp r0, #0x1"
        patch((void *) 0x257b0, toolbar_patch);
    }

    // Show Block Outlines
    int block_outlines = feature_has("Show Block Outlines", 0);
    unsigned char outline_patch[4] = {(unsigned char) (block_outlines ? !touch_gui : touch_gui), 0x00, 0x50, 0xe3}; // "cmp r0, #0x1" or "cmp r0, #0x0"
    patch((void *) 0x4a210, outline_patch);

    // Force Touch Inventory
    if (feature_has("Force Touch Inventory", server_disabled)) {
        overwrite_call((void *) 0x2943c, (void *) operator_new_IngameBlockSelectionScreen_injection);
        overwrite_call((void *) 0x29444, (void *) Touch_IngameBlockSelectionScreen);
    }
}