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GB I/O: Fix inverted button filter

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This commit is contained in:
Vicki Pfau 2018-09-29 23:14:43 -07:00
parent 2865c9ab2b
commit 426993bbbb
1 changed files with 4 additions and 5 deletions
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9
src/gb/io.c
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@ -563,12 +563,11 @@ static uint8_t _readKeysFiltered(struct GB* gb) {
if (!gb->allowOpposingDirections && (keys & 0x30) == 0x20) {
unsigned rl = keys & 0x03;
unsigned ud = keys & 0x0C;
keys &= 0xF0;
if (rl != 0x03) {
keys |= rl;
if (!rl) {
keys |= 0x03;
}
if (ud != 0x0C) {
keys |= ud;
if (!ud) {
keys |= 0x0C;
}
}
return keys;