minecraft-pi-reborn/mods/src/misc/ui.cpp

#include <libreborn/libreborn.h>
#include <symbols/minecraft.h>

#include <GLES/gl.h>
#include <SDL/SDL.h>

#include <mods/feature/feature.h>
#include <mods/classic-ui/classic-ui.h>
#include <mods/misc/misc.h>

#include "misc-internal.h"

// Heart Food Overlay
static int heal_amount = 0, heal_amount_drawing = 0;
static void Gui_renderHearts_injection(Gui_renderHearts_t original, Gui *gui) {
    // Get heal_amount
    heal_amount = heal_amount_drawing = 0;

    Inventory *inventory = gui->minecraft->player->inventory;
    const ItemInstance *held_ii = inventory->getSelected();
    if (held_ii) {
        Item *held = Item::items[held_ii->id];
        if (held->isFood() && held_ii->id) {
            const int nutrition = ((FoodItem *) held)->nutrition;
            const int cur_health = gui->minecraft->player->health;
            const int heal_num = std::min(cur_health + nutrition, 20) - cur_health;
            heal_amount = heal_amount_drawing = heal_num;
        }
    }

    // Call original
    original(gui);
}
#define PINK_HEART_FULL 70
#define PINK_HEART_HALF 79
static void Gui_renderHearts_GuiComponent_blit_overlay_empty_injection(Gui *gui, int32_t x1, int32_t y1, int32_t x2, int32_t y2, int32_t w1, int32_t h1, int32_t w2, int32_t h2) {
    // Call Original Method
    get_blit_with_classic_hud_offset()((GuiComponent *) gui, x1, y1, x2, y2, w1, h1, w2, h2);
    // Render The Overlay
    if (heal_amount_drawing == 1) {
        // Half Heart
        get_blit_with_classic_hud_offset()((GuiComponent *) gui, x1, y1, PINK_HEART_HALF, 0, w1, h1, w2, h2);
        heal_amount_drawing = 0;
    } else if (heal_amount_drawing > 0) {
        // Full Heart
        get_blit_with_classic_hud_offset()((GuiComponent *) gui, x1, y1, PINK_HEART_FULL, 0, w1, h1, w2, h2);
        heal_amount_drawing -= 2;
    }
}
static void Gui_renderHearts_GuiComponent_blit_overlay_hearts_injection(Gui *gui, int32_t x1, int32_t y1, int32_t x2, int32_t y2, int32_t w1, int32_t h1, int32_t w2, int32_t h2) {
    // Offset the overlay
    if (x2 == 52) {
        heal_amount_drawing += 2;
    } else if (x2 == 61 && heal_amount) {
        // Half heart, flipped
        get_blit_with_classic_hud_offset()((GuiComponent *) gui, x1, y1, PINK_HEART_FULL, 0, w1, h1, w2, h2);
        heal_amount_drawing += 1;
    }
    // Call Original Method
    get_blit_with_classic_hud_offset()((GuiComponent *) gui, x1, y1, x2, y2, w1, h1, w2, h2);
    heal_amount_drawing = std::min(heal_amount_drawing, heal_amount);
}

// Additional GUI Rendering
static bool hide_chat_messages = false;
bool is_in_chat = false;
static bool render_selected_item_text = false;
static void Gui_renderChatMessages_injection(Gui_renderChatMessages_t original, Gui *gui, int32_t y_offset, const uint32_t max_messages, const bool disable_fading, Font *font) {
    // Handle Classic HUD
    y_offset -= get_classic_hud_y_offset(gui->minecraft);

    // Call Original Method
    if (!hide_chat_messages && (!is_in_chat || disable_fading)) {
        original(gui, y_offset, max_messages, disable_fading, font);
    }

    // Render Selected Item Text
    if (render_selected_item_text && !disable_fading) {
        // Fix GL Mode
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
        // Calculate Selected Item Text Scale
        const Minecraft *minecraft = gui->minecraft;
        const int32_t screen_width = minecraft->screen_width;
        const float scale = float(screen_width) * Gui::InvGuiScale;
        // Render Selected Item Text
        gui->renderOnSelectItemNameText((int32_t) scale, font, y_offset - 0x13);
    }
}
// Reset Selected Item Text Timer On Slot Select
static bool reset_selected_item_text_timer = false;
static void Gui_tick_injection(Gui_tick_t original, Gui *gui) {
    // Call Original Method
    original(gui);

    // Handle Reset
    if (render_selected_item_text && reset_selected_item_text_timer) {
        // Reset
        gui->selected_item_text_timer = 0;
        reset_selected_item_text_timer = false;
    }
}
// Trigger Reset Selected Item Text Timer On Slot Select
static void Inventory_selectSlot_injection(Inventory_selectSlot_t original, Inventory *inventory, int32_t slot) {
    // Call Original Method
    original(inventory, slot);

    // Trigger Reset Selected Item Text Timer
    if (render_selected_item_text) {
        reset_selected_item_text_timer = true;
    }
}

// Translucent Toolbar
static void Gui_renderToolBar_injection(Gui_renderToolBar_t original, Gui *gui, const float param_1, const int32_t param_2, const int32_t param_3) {
    // Call Original Method
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    original(gui, param_1, param_2, param_3);
    glDisable(GL_BLEND);
}
static void Gui_renderToolBar_glColor4f_injection(const GLfloat red, const GLfloat green, const GLfloat blue, __attribute__((unused)) GLfloat alpha) {
    // Fix Alpha
    glColor4f(red, green, blue, 1.0f);
}

// Fix Screen Rendering When GUI is Hidden
static void Screen_render_injection(Screen_render_t original, Screen *screen, const int32_t param_1, const int32_t param_2, const float param_3) {
    // Fix
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    // Call Original Method
    original(screen, param_1, param_2, param_3);
}

// Close Current Screen On Death To Prevent Bugs
static void LocalPlayer_die_injection(LocalPlayer_die_t original, LocalPlayer *entity, Entity *cause) {
    // Close Screen
    Minecraft *minecraft = entity->minecraft;
    minecraft->setScreen(nullptr);

    // Call Original Method
    original(entity, cause);
}

// Custom Cursor Rendering
//
// The default behavior for Touch GUI is to only render the cursor when the mouse is clicking, this fixes that.
// This also makes the cursor always render if the mouse is unlocked, instead of just when there is a Screen showing.
static void GameRenderer_render_injection(GameRenderer_render_t original, GameRenderer *game_renderer, const float param_1) {
    // Call Original Method
    original(game_renderer, param_1);

    // Check If Cursor Should Render
    if (SDL_WM_GrabInput(SDL_GRAB_QUERY) == SDL_GRAB_OFF) {
        // Fix GL Mode
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
        // Get X And Y
        float x = Mouse::getX() * Gui::InvGuiScale;
        float y = Mouse::getY() * Gui::InvGuiScale;
        // Render Cursor
        Minecraft *minecraft = game_renderer->minecraft;
        Common::renderCursor(x, y, minecraft);
    }
}

// Fix Furnace Visual Bug
static int FurnaceTileEntity_getLitProgress_injection(FurnaceTileEntity_getLitProgress_t original, FurnaceTileEntity *furnace, const int max) {
    // Call Original Method
    int ret = original(furnace, max);

    // Fix Bug
    if (ret > max) {
        ret = max;
    }

    // Return
    return ret;
}

// Add Missing Buttons To Pause Menu
static void PauseScreen_init_injection(PauseScreen_init_t original, PauseScreen *screen) {
    // Call Original Method
    original(screen);

    // Check If Server
    const Minecraft *minecraft = screen->minecraft;
    RakNetInstance *rak_net_instance = minecraft->rak_net_instance;
    if (rak_net_instance != nullptr) {
        if (rak_net_instance->isServer()) {
            // Add Button
            std::vector<Button *> *rendered_buttons = &screen->rendered_buttons;
            std::vector<Button *> *selectable_buttons = &screen->selectable_buttons;
            Button *button = screen->server_visibility_button;
            rendered_buttons->push_back(button);
            selectable_buttons->push_back(button);

            // Update Button Text
            screen->updateServerVisibilityText();
        }
    }
}

// Init
void _init_misc_ui() {
    // Food Overlay
    if (feature_has("Food Overlay", server_disabled)) {
        overwrite_calls(Gui_renderHearts, Gui_renderHearts_injection);
        overwrite_call((void *) 0x266f8, (void *) Gui_renderHearts_GuiComponent_blit_overlay_empty_injection);
        overwrite_call((void *) 0x267c8, (void *) Gui_renderHearts_GuiComponent_blit_overlay_hearts_injection);
    }

    // Render Selected Item Text + Hide Chat Messages
    hide_chat_messages = feature_has("Hide Chat Messages", server_disabled);
    render_selected_item_text = feature_has("Render Selected Item Text", server_disabled);
    overwrite_calls(Gui_renderChatMessages, Gui_renderChatMessages_injection);
    overwrite_calls(Gui_tick, Gui_tick_injection);
    overwrite_calls(Inventory_selectSlot, Inventory_selectSlot_injection);

    // Translucent Toolbar
    if (feature_has("Translucent Toolbar", server_disabled)) {
        overwrite_calls(Gui_renderToolBar, Gui_renderToolBar_injection);
        overwrite_call((void *) 0x26c5c, (void *) Gui_renderToolBar_glColor4f_injection);
    }

    // Fix Screen Rendering When GUI is Hidden
    if (feature_has("Fix Screen Rendering When Hiding HUD", server_disabled)) {
        overwrite_calls(Screen_render, Screen_render_injection);
    }

    // Remove Invalid Item Background (A Red Background That Appears For Items That Are Not Included In The gui_blocks Atlas)
    if (feature_has("Remove Invalid Item Background", server_disabled)) {
        unsigned char invalid_item_background_patch[4] = {0x00, 0xf0, 0x20, 0xe3}; // "nop"
        patch((void *) 0x63c98, invalid_item_background_patch);
    }

    // Close Current Screen On Death To Prevent Bugs
    if (feature_has("Close Current Screen On Death", server_disabled)) {
        overwrite_calls(LocalPlayer_die, LocalPlayer_die_injection);
    }

    // Improved Cursor Rendering
    if (feature_has("Improved Cursor Rendering", server_disabled)) {
        // Disable Normal Cursor Rendering
        unsigned char disable_cursor_patch[4] = {0x00, 0xf0, 0x20, 0xe3}; // "nop"
        patch((void *) 0x4a6c0, disable_cursor_patch);
        // Add Custom Cursor Rendering
        overwrite_calls(GameRenderer_render, GameRenderer_render_injection);
    }

    // Fix Furnace Visual Bug
    if (feature_has("Fix Furnace Screen Visual Bug", server_disabled)) {
        overwrite_calls(FurnaceTileEntity_getLitProgress, FurnaceTileEntity_getLitProgress_injection);
    }

    // Fix Pause Menu
    if (feature_has("Fix Pause Menu", server_disabled)) {
        // Add Missing Buttons To Pause Menu
        overwrite_calls(PauseScreen_init, PauseScreen_init_injection);
    }

    // Remove Forced GUI Lag
    if (feature_has("Remove Forced GUI Lag (Can Break Joining Servers)", server_enabled)) {
        overwrite_calls(Common_sleepMs, nop<Common_sleepMs_t, int>);
    }

    // Custom GUI Scale
    const char *gui_scale_str = getenv(MCPI_GUI_SCALE_ENV);
    if (gui_scale_str != nullptr) {
        unsigned char nop_patch[4] = {0x00, 0xf0, 0x20, 0xe3}; // "nop"
        patch((void *) 0x173e8, nop_patch);
        patch((void *) 0x173f0, nop_patch);
        const float gui_scale = strtof(gui_scale_str, nullptr);
        uint32_t gui_scale_raw;
        memcpy(&gui_scale_raw, &gui_scale, sizeof (gui_scale_raw));
        patch_address((void *) 0x17520, (void *) gui_scale_raw);
    }

    // Don't Wrap Text On '\r' Or '\t' Because They Are Actual Characters In MCPI
    if (feature_has("Fix Text Wrapping", server_disabled)) {
        patch_address(&Strings::text_wrapping_delimiter, (void *) " \n");
    }

    // Fix Invalid ItemInHandRenderer Texture Cache
    if (feature_has("Fix Held Item Caching", server_disabled)) {
        // This works by forcing MCPI to always use the branch that enables using the
        // cache, but then patches that to do the opposite.
        uchar ensure_equal_patch[] = {0x07, 0x00, 0x57, 0xe1}; // "cmp r7, r7"
        patch((void *) 0x4b938, ensure_equal_patch);
        uchar set_true_patch[] = {0x01, 0x30, 0xa0, 0x03}; // "moveq r3, #0x1"
        patch((void *) 0x4b93c, set_true_patch);
    }
}