GameINI: Add a game patch to work around dcache issue (RX4E4Z) #6417
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Work around a dcache issue by preventing the game from doing something pointless. The game's DVD read function writes 0x87654321 to the entire read buffer and 0x12345678 to the last 4 bytes. It then calls DVDReadAsync() and without waiting for the read to complete at all, it checks if the last 4 bytes are still 0x12345678. If they are, then the game fails. The check always passes on console because DVDReadAsync() calls issueCommand(), which calls DCInvalidateRange(read_buffer) (dcbi). Dolphin cannot emulate this without an extremely significant performance hit.
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Fixes Casper's Scare School: Spooky Sports Day. Also it runs at like 600 FPS so maybe we can have dcache and this game run fine. |
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Work around a dcache issue by preventing the game from doing
something pointless.
The game's DVD read function writes 0x87654321 to the entire read
buffer and 0x12345678 to the last 4 bytes. It then calls DVDReadAsync()
and without waiting for the read to complete at all, it checks if the
last 4 bytes are still 0x12345678. If they are, then the game fails.
The check always passes on console because DVDReadAsync() calls
issueCommand(), which calls DCInvalidateRange(read_buffer) (dcbi).
Dolphin cannot emulate this without an extremely significant
performance hit (3-7x according to JMC).