From ff3fbdfa8f000f22f4ff2e245360804ce00921f1 Mon Sep 17 00:00:00 2001
From: Alex Bates <hi@imalex.xyz>
Date: Wed, 14 Oct 2020 23:22:43 +0100
Subject: [PATCH] near-match begin_state_intro

---
 include/variables.h      | 18 +++++++-
 src/code_11a50_len_7a0.c | 90 ++++++++++++++++++++++++++++++++++++++++
 undefined_syms.txt       | 20 +++++++--
 3 files changed, 123 insertions(+), 5 deletions(-)

diff --git a/include/variables.h b/include/variables.h
index 5290e33a19..d67f005c7b 100644
--- a/include/variables.h
+++ b/include/variables.h
@@ -89,10 +89,21 @@ extern Trigger* gTriggerList1[64];
 extern Trigger* gTriggerList2[64];
 extern Trigger** gCurrentTriggerListPtr[64];
 
+// Map transition data. Should probably be a struct
 extern u16 gMapTransitionAlpha;
-extern u16 D_800A0942;
+extern s16 D_800A0942;
 extern s16 D_800A0944;
-
+extern s16 D_800A0954;
+extern s16 D_800A0956;
+extern s16 D_800A0958;
+extern s16 D_800A095A;
+extern u8 D_800A095B;
+extern s16 D_800A095C;
+extern u8 D_800A095D;
+extern s16 D_800A095E;
+extern u8 D_800A095F;
+extern s32 D_800A0960;
+extern s32 D_800A0964;
 
 extern s32 gGameState;
 extern s32 D_8009A650[1];
@@ -138,6 +149,9 @@ extern u32 gBattleMapFlags[MAX_MAPFLAGS];
 
 extern s32 D_8009A5D8;
 
+extern u8 D_800779B0;
+extern u8 D_800A0963;
+
 extern s32 mapScriptLibStart;
 extern s32 mapScriptLibEnd;
 extern s32 mapScriptLibVram;
diff --git a/src/code_11a50_len_7a0.c b/src/code_11a50_len_7a0.c
index b14218f0db..961b0b898f 100644
--- a/src/code_11a50_len_7a0.c
+++ b/src/code_11a50_len_7a0.c
@@ -1,6 +1,96 @@
 #include "common.h"
 
+void set_curtain_scale_goal(f32 arg0);
+void set_curtain_fade_goal(f32 arg0);
+void intro_logos_set_fade_alpha(s16 new_alpha);
+void intro_logos_set_fade_color(s16 arg0);
+
+#ifdef NON_MATCHING
+void begin_state_intro(void) {
+    s8 unk_A8;
+
+    GAME_STATUS->loadMenuState = 0;
+
+    set_curtain_scale_goal(1.0f);
+    set_curtain_fade_goal(0.3f);
+
+    unk_A8 = GAME_STATUS->unk_A8;
+    switch (unk_A8) {
+        case 0:
+            intro_logos_set_fade_alpha(0);
+
+            D_800A0954 = 0xFF;
+            D_800A0956 = 0x10;
+            D_800A0958 = 4;
+            D_800A0960 = 0;
+            D_800A095A = 0xD0;
+            D_800A095C = 0xD0;
+            D_800A095E = 0xD0;
+            D_800A0964 = 0;
+
+            do {
+                GameStatus* gameStatus = GAME_STATUS;
+
+                // hos_05 (Star Sanctuary)
+                gameStatus->areaID = 5;
+                gameStatus->mapID = 5;
+                gameStatus->entryID = 3;
+            } while (0);
+
+            break;
+        case 1:
+            intro_logos_set_fade_alpha(0);
+
+            D_800A0954 = 0;
+            D_800A0956 = 0xC;
+            D_800A0958 = 4;
+            D_800A0960 = unk_A8;
+            D_800A095A = 0;
+            D_800A095C = 0;
+            D_800A095E = 0;
+            D_800A0964 = 0;
+
+            // FIXME: regalloc issues
+            do {
+                GameStatus* gameStatus = GAME_STATUS;
+
+                // hos_04 (Outside the Sanctuary)
+                gameStatus->areaID = 5;
+                gameStatus->mapID = 4;
+                gameStatus->entryID = 4;
+            } while (0);
+
+            break;
+        default:
+            intro_logos_set_fade_alpha(0);
+            intro_logos_set_fade_color(0xD0);
+
+            {
+                GameStatus* gameStatus = GAME_STATUS;
+                u8* mystery = &D_800779B0;
+
+                gameStatus->unk_A8 = -1;
+
+                D_800A0956 = 6;
+                D_800A0958 = 6;
+
+                ++*mystery;
+                if (*mystery >= 4) {
+                    *mystery = 0;
+                }
+
+                D_800A0964 = 3;
+            }
+    }
+
+    func_80137DA4(D_800A0963, (f32)D_800A0954);
+    func_80137E10(1, D_800A095B, D_800A095D, D_800A095F);
+
+    intro_logos_update_fade();
+}
+#else
 INCLUDE_ASM(s32, "code_11a50_len_7a0", begin_state_intro);
+#endif
 
 INCLUDE_ASM(s32, "code_11a50_len_7a0", step_intro);
 
diff --git a/undefined_syms.txt b/undefined_syms.txt
index 26d4c827af..53bd4301ba 100644
--- a/undefined_syms.txt
+++ b/undefined_syms.txt
@@ -29,13 +29,27 @@ gWorldMapFlags = 0x802DBC70;
 gBattleMapFlags = 0x802DBD34;
 
 gMapTransitionAlpha = 0x800A0940;
+D_800A0940 = 0x800A0940;
+D_800A0942 = 0x800A0942;
+D_800A0944 = 0x800A0944;
+D_800A0954 = 0x800A0954;
+D_800A0956 = 0x800A0956;
+D_800A0958 = 0x800A0958;
+D_800A095A = 0x800A095A;
+D_800A095B = 0x800A095B;
+D_800A095C = 0x800A095C;
+D_800A095D = 0x800A095D;
+D_800A095E = 0x800A095E;
+D_800A095F = 0x800A095D;
+D_800A0960 = 0x800A0960;
+D_800A0963 = 0x800A0963;
+D_800A0964 = 0x800A0964;
+
 D_800E92D8 = 0x800E92D8;
 D_80147474 = 0x80147474;
 D_80109270 = 0x80109270;
 D_80108558 = 0x80108558;
-D_800A0940 = 0x800A0940;
-D_800A0942 = 0x800A0942;
-D_800A0944 = 0x800A0944;
+D_800779B0 = 0x800779B0;
 
 D_8010CD10 = 0x8010CD10;
 D_8010CD12 = 0x8010CD12;