From 32f42645d555d01fa3f9ac3839e789a05da5b973 Mon Sep 17 00:00:00 2001
From: Jonathan Hohle <jonhohle@gmail.com>
Date: Sun, 16 Jun 2024 20:11:42 -0700
Subject: [PATCH] Decompile main (#1326)

Decompiles `main`.

Co-authored-by: Jonathan Hohle <jon@ttkb.co>
---
 config/symbols.us.main.txt |  3 ++
 include/game.h             |  3 ++
 src/main/main.c            | 73 +++++++++++++++++++++++++++++++++++++-
 3 files changed, 78 insertions(+), 1 deletion(-)

diff --git a/config/symbols.us.main.txt b/config/symbols.us.main.txt
index e948e71bd..b8715aea0 100644
--- a/config/symbols.us.main.txt
+++ b/config/symbols.us.main.txt
@@ -1,3 +1,6 @@
 D_80010960 = 0x80010960; // force_migration:True
 D_80010964 = 0x80010964; // force_migration:True
+main_fd = 0x800339F8;
+main_cdlFile = 0x800339FC;
+main_cdlMode = 0x80033A14;
 g_MainGame = 0x800A0000;
diff --git a/include/game.h b/include/game.h
index fe8187a76..a97cd97ce 100644
--- a/include/game.h
+++ b/include/game.h
@@ -185,6 +185,7 @@ typedef struct Prim {
 #define WEAPON_1_START 0xF0
 
 #ifndef VERSION_PC
+#define DRA_PRG_PTR 0x800A0000
 #define RIC_PRG_PTR 0x8013C000
 #define FAMILIAR_PTR 0x80170000
 #define WEAPON0_PTR 0x8017A000
@@ -199,6 +200,7 @@ typedef struct Prim {
 #define SIM_PTR 0x80280000
 
 #else
+#define DRA_PRG_PTR 0x800A0000
 #define RIC_PRG_PTR 0x8013C000
 #define FAMILIAR_PTR 0x80170000
 #define WEAPON0_PTR 0x8017A000
@@ -334,6 +336,7 @@ typedef enum {
     Game_PrologueEnd,
     Game_MainMenu,
     Game_Ending,
+    Game_Boot,
     Game_99 = 99,
 } GameState;
 
diff --git a/src/main/main.c b/src/main/main.c
index 682dd2844..4681d0e1c 100644
--- a/src/main/main.c
+++ b/src/main/main.c
@@ -1,5 +1,76 @@
 #include "common.h"
+#include "game.h"
 
-INCLUDE_ASM("main/nonmatchings/main", main);
+extern void (*g_MainGame)();
+extern CdlFILE main_cdlFile;
+extern u8 main_cdlMode[];
+extern s32 main_fd;
+
+void main(void) {
+    ResetCallback();
+    InitHeap((void*)0x801F0000, 0x7800);
+    CdInit();
+
+    g_GameState = Game_Boot;
+
+    do {
+        main_fd = open("sim:c:\\bin\\dra.bin", 1);
+    } while (main_fd == -1 && --g_GameState != Game_Init);
+
+    if (g_GameState != Game_Init) {
+        read(main_fd, (void*)DRA_PRG_PTR, 0x130000);
+        close(main_fd);
+        g_UseDisk = 0;
+        main_fd = open("sim:c:\\bin\\dra.bio", 1);
+
+        if (main_fd != -1) {
+            g_UseDisk = 2;
+        }
+
+        do {
+            main_fd = open("sim:c:\\bin\\f_map.bin", 1);
+        } while (main_fd < 0);
+
+        read(main_fd, (void*)CASTLE_MAP_PTR, 0x8000);
+        close(main_fd);
+    } else {
+    main_search_loop_1:
+        while (!CdSearchFile(&main_cdlFile, "\\DRA.BIN;1")) {
+        }
+
+        *main_cdlMode = CdlModeSpeed | CdlModeSpeedNormal;
+        CdControl(CdlSetmode, main_cdlMode, NULL);
+
+        while (CdSync(1, NULL) != 2) {
+        }
+
+        g_GameState = (main_cdlFile.size + 0x7ff) >> 0xB;
+        CdControl(CdlSetloc, &main_cdlFile, NULL);
+        CdRead(g_GameState, (u32*)DRA_PRG_PTR, 0x80);
+        // block until read is complete
+        main_fd = CdReadSync(0, NULL);
+        if (main_fd < 0) {
+            goto main_search_loop_1;
+        }
+
+        g_UseDisk = 1;
+
+    main_search_loop_2:
+        if (!CdSearchFile(&main_cdlFile, "\\F_MAP.BIN;1")) {
+            goto main_search_loop_2;
+        } else {
+            g_GameState = (main_cdlFile.size + 0x7ff) >> 0xB;
+        }
+        CdControl(CdlSetloc, &main_cdlFile, NULL);
+        CdRead(g_GameState, (u32*)CASTLE_MAP_PTR, 0x80);
+        // block until read is complete
+        main_fd = CdReadSync(0, NULL);
+
+        if (main_fd < 0) {
+            goto main_search_loop_2;
+        }
+    }
+    g_MainGame();
+}
 
 const char a0123456789abcd[] = "0123456789ABCDEF\0\0\0\0";