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GBA VFame: Refactor reordering code to be simpler

This commit is contained in:
Vicki Pfau 2024-11-17 02:24:44 -08:00
parent 3d493239d7
commit d5fbd0ff1c
1 changed files with 38 additions and 41 deletions
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43
src/gba/cart/vfame.c
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@ -1,4 +1,5 @@
/* Copyright (c) 2016 taizou
* Copyright (c) 2013-2024 Jeffrey Pfau
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
@ -8,35 +9,42 @@
#include <mgba/internal/gba/gba.h>
#include <mgba/internal/gba/memory.h>
static const uint8_t ADDRESS_REORDERING[4][16] = {
#define DIGIMON_SAPPHIRE_CHINESE_CRC32 0x793A328F
static const uint8_t ADDRESS_REORDERING[][3][16] = {
[VFAME_STANDARD] = {
{ 15, 14, 9, 1, 8, 10, 7, 3, 5, 11, 4, 0, 13, 12, 2, 6 },
{ 15, 7, 13, 5, 11, 6, 0, 9, 12, 2, 10, 14, 3, 1, 8, 4 },
{ 15, 0, 3, 12, 2, 4, 14, 13, 1, 8, 6, 7, 9, 5, 11, 10 }
};
static const uint8_t ADDRESS_REORDERING_GEORGE[4][16] = {
},
[VFAME_GEORGE] = {
{ 15, 7, 13, 1, 11, 10, 14, 9, 12, 2, 4, 0, 3, 5, 8, 6 },
{ 15, 14, 3, 12, 8, 4, 0, 13, 5, 11, 6, 7, 9, 1, 2, 10 },
{ 15, 0, 9, 5, 2, 6, 7, 3, 1, 8, 10, 14, 13, 12, 11, 4 }
};
static const uint8_t ADDRESS_REORDERING_ALTERNATE[4][16] = {
},
[VFAME_ALTERNATE] = {
{ 15, 0, 13, 5, 8, 4, 7, 3, 1, 2, 10, 14, 9, 12, 11, 6 },
{ 15, 7, 9, 1, 2, 6, 14, 13, 12, 11, 4, 0, 3, 5, 8, 10 },
{ 15, 14, 3, 12, 11, 10, 0, 9, 5, 8, 6, 7, 13, 1, 2, 4 }
},
};
static const uint8_t VALUE_REORDERING[4][16] = {
static const uint8_t VALUE_REORDERING[][3][8] = {
[VFAME_STANDARD] = {
{ 5, 4, 3, 2, 1, 0, 7, 6 },
{ 3, 2, 1, 0, 7, 6, 5, 4 },
{ 1, 0, 7, 6, 5, 4, 3, 2 }
};
static const uint8_t VALUE_REORDERING_GEORGE[4][16] = {
},
[VFAME_GEORGE] = {
{ 3, 0, 7, 2, 1, 4, 5, 6 },
{ 1, 4, 3, 0, 5, 6, 7, 2 },
{ 5, 2, 1, 6, 7, 0, 3, 4 }
};
static const uint8_t VALUE_REORDERING_ALTERNATE[4][16] = {
},
[VFAME_ALTERNATE] = {
{ 5, 4, 7, 2, 1, 0, 3, 6 },
{ 1, 2, 3, 0, 5, 6, 7, 4 },
{ 3, 0, 1, 6, 7, 4, 5, 2 }
},
};
static const int8_t MODE_CHANGE_START_SEQUENCE[5] = { 0x99, 0x02, 0x05, 0x02, 0x03 };
@ -268,25 +276,14 @@ static uint32_t _modifySramAddress(enum GBAVFameCartType type, uint32_t address,
mode &= 0x3;
if (mode == 0) {
return address;
} else if (type == VFAME_GEORGE) {
return _reorderBits(address, ADDRESS_REORDERING_GEORGE[mode - 1], 16);
} else if (type == VFAME_ALTERNATE) {
return _reorderBits(address, ADDRESS_REORDERING_ALTERNATE[mode - 1], 16);
} else {
return _reorderBits(address, ADDRESS_REORDERING[mode - 1], 16);
}
return _reorderBits(address, ADDRESS_REORDERING[type][mode - 1], 16);
}
static int8_t _modifySramValue(enum GBAVFameCartType type, uint8_t value, int mode) {
int reorderType = (mode & 0xF) >> 2;
if (reorderType != 0) {
if (type == VFAME_GEORGE) {
value = _reorderBits(value, VALUE_REORDERING_GEORGE[reorderType - 1], 8);
} else if (type == VFAME_ALTERNATE) {
value = _reorderBits(value, VALUE_REORDERING_ALTERNATE[reorderType - 1], 8);
} else {
value = _reorderBits(value, VALUE_REORDERING[reorderType - 1], 8);
}
value = _reorderBits(value, VALUE_REORDERING[type][reorderType - 1], 8);
}
if (mode & 0x80) {
value ^= 0xAA;