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igs011.cpp: decrypted drgnwrldv40k. Seems ok (at least with how far the game can get without protection handling) but could probably be simplified a bit more. The set needs protection handling to be promoted to working (nw)

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This commit is contained in:
Ivan Vangelista 2019-04-03 18:17:43 +02:00
parent 329ccb786e
commit a5c00bb026
1 changed files with 33 additions and 2 deletions
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35
src/mame/drivers/igs011.cpp
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@ -259,6 +259,7 @@ private:
void drgnwrld_type3_decrypt();
void drgnwrld_type2_decrypt();
void drgnwrld_type1_decrypt();
void drgnwrldv40k_decrypt();
void lhb2_decrypt();
void nkishusp_decrypt();
void vbowl_decrypt();
@ -807,6 +808,36 @@ void igs011_state::drgnwrld_type1_decrypt()
}
}
void igs011_state::drgnwrldv40k_decrypt()
{
drgnwrld_type1_decrypt();
uint16_t *src = (uint16_t *) (memregion("maincpu")->base());
int rom_size = 0x80000;
for(int i = 0; i < rom_size / 2; i++)
{
uint16_t x = src[i];
if ((i & 0x0800) != 0x0800)
x ^= 0x0200;
if (((i & 0x3a00) == 0x0a00) ^ ((i & 0x3a00) == 0x2a00))
x ^= 0x0200;
if (((i & 0x3ae0) == 0x0860) ^ ((i & 0x3ae0) == 0x2860))
x ^= 0x0200;
if (((i & 0x1c00) == 0x1800) ^ ((i & 0x1e00) == 0x1e00))
x ^= 0x0200;
if ((i & 0x1ee0) == 0x1c60)
x ^= 0x0200;
src[i] = x;
}
}
void igs011_state::lhb2_decrypt()
{
@ -2277,7 +2308,7 @@ void igs011_state::init_drgnwrldv20j()
void igs011_state::init_drgnwrldv40k()
{
//drgnwrld_type3_decrypt(); // wrong
drgnwrldv40k_decrypt();
drgnwrld_gfx_decrypt();
//m_maincpu->space(AS_PROGRAM).install_read_handler(0xd4c0, 0xd4ff, read16_delegate(FUNC(igs011_state::drgnwrldv21_igs011_prot2_r), this)); // wrong
@ -4986,7 +5017,7 @@ ROM_END
***************************************************************************/
GAME( 1997, drgnwrld, 0, drgnwrld, drgnwrld, igs011_state, init_drgnwrld, ROT0, "IGS", "Dragon World (World, V040O)", MACHINE_SUPPORTS_SAVE )
GAME( 1995, drgnwrldv40k, drgnwrld, drgnwrld_igs012, drgnwrldc, igs011_state, init_drgnwrldv40k, ROT0, "IGS", "Dragon World (Korea, V040K)", MACHINE_SUPPORTS_SAVE | MACHINE_NOT_WORKING )
GAME( 1995, drgnwrldv40k, drgnwrld, drgnwrld_igs012, drgnwrldc, igs011_state, init_drgnwrldv40k, ROT0, "IGS", "Dragon World (Korea, V040K)", MACHINE_SUPPORTS_SAVE | MACHINE_NOT_WORKING ) // protection handling needs to be updated for this set
GAME( 1995, drgnwrldv30, drgnwrld, drgnwrld, drgnwrld, igs011_state, init_drgnwrldv30, ROT0, "IGS", "Dragon World (World, V030O)", MACHINE_SUPPORTS_SAVE )
GAME( 1995, drgnwrldv21, drgnwrld, drgnwrld_igs012, drgnwrld, igs011_state, init_drgnwrldv21, ROT0, "IGS", "Dragon World (World, V021O)", MACHINE_SUPPORTS_SAVE )
GAME( 1995, drgnwrldv21j, drgnwrld, drgnwrld_igs012, drgnwrldj, igs011_state, init_drgnwrldv21j, ROT0, "IGS / Alta", "Zhongguo Long (Japan, V021J)", MACHINE_SUPPORTS_SAVE )