127 lines
4.3 KiB
C
127 lines
4.3 KiB
C
#include <string.h>
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#include <libreborn/libreborn.h>
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#include <symbols/minecraft.h>
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#include <mods/feature/feature.h>
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#include <mods/init/init.h>
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// Force Mob Spawning
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static bool LevelData_getSpawnMobs_injection(__attribute__((unused)) unsigned char *level_data) {
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return 1;
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}
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// Get Custom Render Distance
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static int get_render_distance() {
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char *distance_str = getenv("MCPI_RENDER_DISTANCE");
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if (distance_str == NULL) {
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distance_str = "Short";
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}
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if (strcmp("Far", distance_str) == 0) {
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return 0;
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} else if (strcmp("Normal", distance_str) == 0) {
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return 1;
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} else if (strcmp("Short", distance_str) == 0) {
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return 2;
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} else if (strcmp("Tiny", distance_str) == 0) {
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return 3;
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} else {
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ERR("Invalid Render Distance: %s", distance_str);
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}
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}
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// Get Custom Username
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static char *get_username() {
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char *username = getenv("MCPI_USERNAME");
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if (username == NULL) {
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username = "StevePi";
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}
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return username;
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}
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static char *safe_username = NULL;
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__attribute__((destructor)) static void _free_safe_username() {
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free(safe_username);
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}
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static int fancy_graphics;
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static int peaceful_mode;
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static int anaglyph;
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static int smooth_lighting;
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static int render_distance;
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static int server_visible;
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// Configure Options
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static void Minecraft_init_injection(unsigned char *this) {
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// Call Original Method
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(*Minecraft_init)(this);
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unsigned char *options = this + Minecraft_options_property_offset;
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// Enable Fancy Graphics
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*(options + Options_fancy_graphics_property_offset) = fancy_graphics;
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// Enable Crosshair In Touch GUI
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*(options + Options_split_controls_property_offset) = 1;
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// Peaceful Mode
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*(int32_t *) (options + Options_game_difficulty_property_offset) = peaceful_mode ? 0 : 2;
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// 3D Anaglyph
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*(options + Options_3d_anaglyph_property_offset) = anaglyph;
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// Smooth Lighting
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*(options + Options_ambient_occlusion_property_offset) = smooth_lighting;
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// Render Distance
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*(int32_t *) (options + Options_render_distance_property_offset) = render_distance;
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// Server Visible
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*(options + Options_server_visible_property_offset) = server_visible;
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}
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// Init
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void init_options() {
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// Force Mob Spawning
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if (feature_has("Force Mob Spawning", server_auto)) {
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overwrite((void *) LevelData_getSpawnMobs, (void *) LevelData_getSpawnMobs_injection);
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}
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// Enable Fancy Graphics
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fancy_graphics = feature_has("Fancy Graphics", server_disabled);
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// Peaceful Mode
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peaceful_mode = feature_has("Peaceful Mode", server_auto);
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// 3D Anaglyph
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anaglyph = feature_has("3D Anaglyph", server_disabled);
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// Render Distance
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render_distance = get_render_distance();
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DEBUG("Setting Render Distance: %i", render_distance);
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// Server Visible
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server_visible = !feature_has("Disable Hosting LAN Worlds", server_disabled);
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// Set Options
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overwrite_calls((void *) Minecraft_init, (void *) Minecraft_init_injection);
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// Change Username
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const char *username = get_username();
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DEBUG("Setting Username: %s", username);
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if (strcmp(*default_username, "StevePi") != 0) {
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ERR("Default Username Is Invalid");
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}
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safe_username = to_cp437(username);
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patch_address((void *) default_username, (void *) safe_username);
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unsigned char username_length_patch[4] = {(unsigned char) strlen(safe_username), 0x20, 0xa0, 0xe3}; // "mov r2, #USERNAME_LENGTH"
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patch((void *) 0x1ba2c, username_length_patch);
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// Disable Autojump By Default
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if (feature_has("Disable Autojump By Default", server_disabled)) {
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unsigned char autojump_patch[4] = {0x00, 0x00, 0xa0, 0xe3}; // "mov r0, #0x0"
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patch((void *) 0x5b148, autojump_patch);
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}
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// Display Nametags By Default
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if (feature_has("Display Nametags By Default", server_disabled)) {
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// r6 = 0x1
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// r12 = 0x0
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unsigned char display_nametags_patch[4] = {0x1d, 0x60, 0xc4, 0xe5}; // "strb r6, [r4, #0x1d]"
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patch((void *) 0xf2d44, display_nametags_patch);
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}
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// Enable Smooth Lighting
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smooth_lighting = feature_has("Smooth Lighting", server_disabled);
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if (smooth_lighting) {
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unsigned char smooth_lighting_patch[4] = {0x01, 0x00, 0x53, 0xe3}; // "cmp r3, #0x1"
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patch((void *) 0x73b74, smooth_lighting_patch);
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}
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}
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