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52 lines
1.1 KiB
C++
52 lines
1.1 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "MMC3.h"
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class MMC3_165 : public MMC3
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{
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private:
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bool _chrLatch[2] = { false, false };
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bool _needUpdate = false;
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protected:
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virtual uint16_t GetCHRPageSize() override { return 0x1000; }
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virtual uint32_t GetChrRamSize() override { return 0x1000; }
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virtual uint16_t GetChrRamPageSize() override { return 0x1000; }
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virtual void StreamState(bool saving) override
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{
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MMC3::StreamState(saving);
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Stream(_chrLatch[0], _chrLatch[1], _needUpdate);
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}
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virtual void UpdateChrMapping() override
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{
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uint16_t page;
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for(int i = 0; i < 2; i++) {
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page = _registers[i == 0 ? (_chrLatch[0] ? 1 : 0) : (_chrLatch[1] ? 4 : 2)];
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if(page == 0) {
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SelectCHRPage(i, 0, ChrMemoryType::ChrRam);
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} else {
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SelectCHRPage(i, page >> 2, ChrMemoryType::ChrRom);
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}
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}
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_needUpdate = false;
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}
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virtual void NotifyVRAMAddressChange(uint16_t addr) override
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{
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if(_needUpdate) {
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UpdateChrMapping();
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}
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//MMC2 style latch
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switch(addr & 0x2FF8) {
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case 0xFD0: case 0xFE8:
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_chrLatch[(addr >> 12) & 0x01] = ((addr & 0x08) == 0x08);
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_needUpdate = true;
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break;
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}
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}
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}; |