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Merge pull request #1113 from TomHarte/VDPs

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TMS9918 &c: Eliminate hard-coded assumption of 16kb.
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Thomas Harte 2023-01-10 14:40:38 -05:00 committed by GitHub
commit 3352feb21b
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2 changed files with 6 additions and 2 deletions
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4
Components/9918/Implementation/9918Base.hpp
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@ -360,10 +360,10 @@ template <Personality personality> struct Base {
break; break;
} }
} }
ram_[ram_pointer_ & 16383] = read_ahead_buffer_; ram_[ram_pointer_ & memory_mask(personality)] = read_ahead_buffer_;
break; break;
case MemoryAccess::Read: case MemoryAccess::Read:
read_ahead_buffer_ = ram_[ram_pointer_ & 16383]; read_ahead_buffer_ = ram_[ram_pointer_ & memory_mask(personality)];
break; break;
} }
++ram_pointer_; ++ram_pointer_;

4
Components/9918/Implementation/PersonalityTraits.hpp
View File

@ -42,6 +42,10 @@ constexpr size_t memory_size(Personality p) {
} }
} }
constexpr uint16_t memory_mask(Personality p) {
return (memory_size(p) >= 65536) ? 0xffff : uint16_t(memory_size(p) - 1);
}
} }
} }