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Takes a first, faltering shot at shadowing.

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This commit is contained in:
Thomas Harte 2020-10-27 19:49:47 -04:00
parent 31cd45f8b5
commit e44f95a882
1 changed files with 34 additions and 1 deletions
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35
Machines/Apple/AppleIIgs/MemoryMap.hpp
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@ -340,7 +340,40 @@ class MemoryMap {
}
void set_shadowing() {
// TODO.
// TODO: check speed register bit to determine potential effect
// on all pages beyond $00 and $01.
#define apply(flag, zone) \
if(flag) { \
regions[region_map[zone]].flags &= ~Region::IsShadowed; \
} else { \
regions[region_map[zone]].flags |= Region::IsShadowed; \
}
// Text Page 1, main and auxiliary.
apply(shadow_register_ & 0x01, 0x0004);
apply(shadow_register_ & 0x01, 0x0104);
// Text Page 2, main and auxiliary.
// TODO: on a ROM03 machine only.
apply(shadow_register_ & 0x20, 0x0008);
apply(shadow_register_ & 0x20, 0x0108);
// Hi-res graphics Page 1, main and auxiliary.
apply(shadow_register_ & 0x02, 0x0020);
apply(shadow_register_ & 0x12, 0x0120);
// Hi-res graphics Page 2, main and auxiliary.
apply(shadow_register_ & 0x04, 0x0040);
apply(shadow_register_ & 0x14, 0x0140);
// Residue of Super Hi-Res.
apply(shadow_register_ & 0x08, 0x0160);
// TODO: does inhibiting Super Hi-Res also affect the regular hi-res pages?
#undef apply
}
void set_main_paging() {