Merge pull request #83 from RevoSucks/decompile_6A40

decompile 6A40

splat.yaml

@@ -43,7 +43,7 @@ segments:
     - [0x5580, asm] # there's a split here according to PAL
     - [0x60A0, asm] # 
     - [0x6430, c, controller] # controller code
-    - [0x6A40, asm] #
+    - [0x6A40, c]
     - [0x6BC0, asm] # 
     - [0x75F0, asm] # stage loader
     - [0x8EC0, c, crash_screen] # crash handler

src/6A40.c

@@ -0,0 +1,61 @@
+#include <ultra64.h>
+
+struct UnkStruct800A7428 {
+    u32 *unk0;
+    u32 *unk4;
+    u32 unk8;
+    s32 unkC;
+    s16 unk10;
+};
+
+extern struct UnkStruct800A7428 D_800A7428;
+extern Gfx* gDisplayListHead;
+
+void func_80005EDC(void);
+
+void func_80005E40(u32 arg0, s32 arg1) {
+    D_800A7428.unk10 = 0;
+    D_800A7428.unkC = arg0;
+    D_800A7428.unk0 = main_pool_alloc_with_func(arg0, arg1, 'DYN0', NULL);
+    D_800A7428.unk4 = main_pool_alloc_with_func(arg0, arg1, 'DYN1', NULL);
+    func_80005EDC();
+}
+
+void func_80005EAC(void) {
+    main_pool_try_free(D_800A7428.unk4);
+    main_pool_try_free(D_800A7428.unk0);
+}
+
+void func_80005EDC(void) {
+    s32 *temp_v0 = (s32*)&D_800A7428;
+
+    D_800A7428.unk10 ^= 1;
+    temp_v0 += D_800A7428.unk10;
+
+    D_800A7428.unk8 = *temp_v0 + D_800A7428.unkC;
+    gDisplayListHead = *temp_v0;
+}
+
+void func_80005F1C(s32* arg0, s32* arg1) {
+    s32 *ptr = (s32*)&D_800A7428;
+    *arg1 = (uintptr_t)gDisplayListHead - ptr[D_800A7428.unk10];
+    *arg0 = ptr[D_800A7428.unk10];
+}
+
+u32 func_80005F5C(s32 arg0) {
+    u32 temp_v0;
+    u32 ret;
+
+    arg0 = ALIGN8(arg0);
+    temp_v0 = (D_800A7428.unk8 - arg0);
+    ret = 0;
+    if (temp_v0 >= (uintptr_t)gDisplayListHead) {
+        D_800A7428.unk8 = temp_v0;
+        ret = temp_v0;
+    }
+    return ret;
+}
+
+s32 func_80005F9C(void) {
+    return D_800A7428.unk8 - (uintptr_t)gDisplayListHead;
+}