super-mario-64/enhancements/mem_error_screen.inc.c

/*
 * mem_error_screen.inc.c
 *
 * This enhancement should be used for ROM hacks that require the expansion pak.
 *
 * ----- Setup -----
 *
 * Make sure that USE_EXT_RAM is defined in include/segments.h
    #define USE_EXT_RAM
 *
 * There are 6 files you will need to edit:
 * src/game/main.c
 * src/engine/level_script.h
 * include/text_strings.h.in
 * levels/entry.s
 * levels/intro/script.s
 * levels/intro/geo.s
 *
 * First, in main.c, you will need to add this line below the includes:
   #include "../enhancements/mem_error_screen.inc.c"
 *
 * In the function AllocPool(), add these lines above main_pool_init():
    // Detect memory size
    if(does_pool_end_lie_out_of_bounds(end))
    {
        end = (void *)SEG_POOL_END_4MB;
    }
 * 
 * Then in thread3_main(), replace the create_thread for thread 5 with this if/else statement:
    if(!gNotEnoughMemory)
    {
        create_thread(&gGameLoopThread, 5, thread5_game_loop, NULL, gThread5Stack + 0x2000, 10);
    }
    else
    {
        create_thread(&gGameLoopThread, 5, thread5_mem_error_message_loop, NULL, gThread5Stack + 0x2000, 10);
    }
 *
 * In src/engine/level_script.h, add this line below 'extern u8 level_script_entry[];' 
    extern u8 level_script_entry_error_screen[];
 *
 * In include/text_strings.h.in, add these 3 lines at the top. You can also add more strings if you want.
    #define TEXT_CONSOLE_8MB _("If you're using an N64 console, then you will need to buy an\nExpansion Pak to play this ROM hack.")
    #define TEXT_PJ64 _("If you are using PJ64 1.6, go to:\nOptions > Settings > Rom Settings Tab > Memory Size\nthen select 8 MB from the drop-down box.")
    #define TEXT_PJ64_2 _("If you are using PJ64 2.X, go to:\nOptions > Settings > Config: > Memory Size, select 8 MB")
 *
 * In levels/entry.s, simply append the following to the file:
    glabel level_script_entry_error_screen
        init_level
        sleep 2
        blackout FALSE
        set_reg 0
        execute 0x14, _introSegmentRomStart, _introSegmentRomEnd, level_intro_entry_error_screen
        jump level_script_entry_error_screen
    .align 4
 *
 * In levels/intro/script.s, add the following to the top of the file:
    glabel level_intro_entry_error_screen
        init_level
        fixed_load _goddardSegmentStart, _goddardSegmentRomStart, _goddardSegmentRomEnd
        load_mio0 0x07, _intro_segment_7SegmentRomStart, _intro_segment_7SegmentRomEnd
        alloc_level_pool

        area 1, intro_geo_error_screen
        end_area
        
        free_level_pool
        load_area 1
        sleep 32767
        exit_and_execute 0x14, _introSegmentRomStart, _introSegmentRomEnd, level_intro_entry_error_screen
 *
 * Finally, add the following to the top of levels/intro/geo.s:
    glabel intro_geo_error_screen
        geo_node_screen_area 0, 160, 120, 160, 120
        geo_open_node
            geo_zbuffer 0
            geo_open_node
                geo_todo_09 100
                geo_open_node
                    geo_background 0x0001
                geo_close_node
            geo_close_node
            geo_zbuffer 0
            geo_open_node
                geo_asm 0, geo18_display_error_message
            geo_close_node
        geo_close_node
        geo_end
 */

// Ensure that USE_EXT_RAM is defined.
#ifndef USE_EXT_RAM
#error You have to define USE_EXT_RAM in 'include/segments.h'
#endif
 
#include <types.h>
#include <text_strings.h>
#include "../src/game/display.h"
#include "../src/game/print.h"
#include "../src/game/ingame_menu.h"
#include "../src/game/segment2.h"
#include "../src/engine/level_script.h"

// Require 8 MB of RAM, even if the pool doesn't go into extended memory.
// Change the '8' to whatever MB limit you want. 
// Note: only special emulators allow for RAM sizes above 8 MB.
#define REQUIRED_MIN_MEM_SIZE 1048576 * 8

u8 gNotEnoughMemory = FALSE;
u8 gDelayForErrorMessage = 0;

u8 does_pool_end_lie_out_of_bounds(void *end)
{
    u32 endPhy = ((u32)end) & 0x1FFFFFFF;
    u32 memSize = *((u32*)0x80000318);
    
    if(endPhy > memSize)
    {
        gNotEnoughMemory = TRUE;
        return TRUE;
    }
    else
    {
        if(memSize < REQUIRED_MIN_MEM_SIZE)
        {
            gNotEnoughMemory = TRUE;
        }
        return FALSE;
    }
}

// If you're using an N64 console, then you will need to buy an\nexpansion pak to play this ROM hack.
u8 text_console_8mb[] = { TEXT_CONSOLE_8MB };

// If you are using PJ64 1.6, go to: Options ► Settings ► Rom Settings Tab ► Memory Size then select 8 MB from the drop-down box.
u8 text_pj64[] = { TEXT_PJ64 };

// If you are using PJ64 2.X, go to: Options ► Settings ► Config: ► Memory Size, select 8 MB
u8 text_pj64_2[] = { TEXT_PJ64_2 };

Gfx *geo18_display_error_message(u32 run, UNUSED struct GraphNode *sp44, UNUSED u32 sp48)
{
   if (run)
   {
      if(gDelayForErrorMessage > 0)
      {
          // Draw color text title.
          print_text(10, 210, "ERROR    Need more memory");
      
          // Init generic text rendering
          dl_add_new_ortho_matrix();
          gSPDisplayList(gDisplayListHead++, dl_ia8_text_begin); // Init rendering stuff for generic text
          
          // Set text color to white
          gDPSetEnvColor(gDisplayListHead++, 255, 255, 255, 255);
          
          PrintGenericText(8, 170, text_console_8mb);
          PrintGenericText(8, 120, text_pj64);
          PrintGenericText(8, 54, text_pj64_2);
          
          // Cleanup
          gSPDisplayList(gDisplayListHead++, dl_ia8_text_end); // Reset back to default render settings.
          gSPPopMatrix(gDisplayListHead++, G_MTX_MODELVIEW);
      }
      else
      {
          gDelayForErrorMessage += 1;
      }
   }
   
   return 0;
}

// Basic main loop for the error screen. Note that controllers are not enabled here.
void thread5_mem_error_message_loop(UNUSED void *arg)
{
    struct LevelCommand *addr;

    setup_game_memory();
    set_vblank_handler(2, &gGameVblankHandler, &gGameVblankQueue, (OSMesg)1);
    
    addr = (struct LevelCommand *) segmented_to_virtual(level_script_entry_error_screen);
    
    func_80247ED8();
    
    while(1)
    {
        func_80247FAC();
        addr = level_script_execute(addr);
        display_and_vsync();
    }
}