bsnes-mt/bsnes/target-bsnes/program/_hacks.cpp

// Slightly refactored by MT.
auto Program::hackCompatibility() -> void {
	string entropy              = settings.emulator.hack.entropy;
	bool fastJoypadPolling      = false;
	bool fastPPU                = settings.emulator.hack.ppu.fast;
	bool fastPPUNoSpriteLimit   = settings.emulator.hack.ppu.noSpriteLimit;
	bool fastDSP                = settings.emulator.hack.dsp.fast;
	bool coprocessorDelayedSync = settings.emulator.hack.coprocessor.delayedSync;
	uint renderCycle            = 512;

	auto title  = superFamicom.title;
	auto region = superFamicom.region;

	//sometimes menu options are skipped over in the main menu with cycle-based joypad polling
	if (title == "Arcades Greatest Hits") {
		fastJoypadPolling = true;
	}

	//the start button doesn't work in this game with cycle-based joypad polling
	else if (title == "TAIKYOKU-IGO Goliath") {
		fastJoypadPolling = true;
	}

	//holding up or down on the menu quickly cycles through options instead of stopping after each button press
	else if (title == "WORLD MASTERS GOLF") {
		fastJoypadPolling = true;
	}

	//relies on mid-scanline rendering techniques
	else if (title == "AIR STRIKE PATROL" || title == "DESERT FIGHTER") {
		fastPPU = false;
	}

	//the dialogue text is blurry due to an issue in the scanline-based renderer's color math support
	else if (title == "マーヴェラス") {
		fastPPU = false;
	}

	//stage 2 uses pseudo-hires in a way that's not compatible with the scanline-based renderer
	else if (title == "SFC クレヨンシンチャン") {
		fastPPU = false;
	}

	//title screen game select (after choosing a game) changes OAM tiledata address mid-frame
	//this is only supported by the cycle-based PPU renderer
	else if (title == "Winter olympics") {
		fastPPU = false;
	}

	//title screen shows remnants of the flag after choosing a language with the scanline-based renderer
	else if (title == "WORLD CUP STRIKER") {
		fastPPU = false;
	}

	//relies on cycle-accurate writes to the echo buffer
	else if (title == "KOUSHIEN_2") {
		fastDSP = false;
	}

	//will hang immediately
	else if (title == "RENDERING RANGER R2") {
		fastDSP = false;
	}

	//will hang sometimes in the "Bach in Time" stage
	else if (title == "BUBSY II" && region == "PAL") {
		fastDSP = false;
	}

	//fixes an errant scanline on the title screen due to writing to PPU registers too late
	else if (title == "ADVENTURES OF FRANKEN" && region == "PAL") {
		renderCycle = 32;
	}

	//fixes an errant scanline on the title screen due to writing to PPU registers too late
	else if (title == "FIREPOWER 2000" || title == "SUPER SWIV") {
		renderCycle = 32;
	}

	//fixes an errant scanline on the title screen due to writing to PPU registers too late
	else if (title == "NHL '94" || title == "NHL PROHOCKEY'94") {
		renderCycle = 32;
	}

	//fixes an errant scanline on the title screen due to writing to PPU registers too late
	else if (title == "Sugoro Quest++") {
		renderCycle = 128;
	}

	if (settings.emulator.hack.hotfixes) {
		//this game transfers uninitialized memory into video RAM: this can cause a row of invalid tiles
		//to appear in the background of stage 12. this one is a bug in the original game, so only enable
		//it if the hotfixes option has been enabled.
		if (title == "The Hurricanes") {
			entropy = "None";
		}

		//Frisky Tom attract sequence sometimes hangs when WRAM is initialized to pseudo-random patterns
		else if (title == "ニチブツ・アーケード・クラシックス") {
			entropy = "None";
		}
	}

	emulator->configure("Hacks/Entropy",                 entropy);
	emulator->configure("Hacks/CPU/FastJoypadPolling",   fastJoypadPolling);
	emulator->configure("Hacks/PPU/Fast",                fastPPU);
	emulator->configure("Hacks/PPU/NoSpriteLimit",       fastPPUNoSpriteLimit);
	emulator->configure("Hacks/PPU/RenderCycle",         renderCycle);
	emulator->configure("Hacks/PPU/Mode7/Scale",         settings.emulator.hack.ppu.mode7.scale);
	emulator->configure("Hacks/PPU/Mode7/Perspective",   settings.emulator.hack.ppu.mode7.perspective);
	emulator->configure("Hacks/PPU/Mode7/Supersample",   settings.emulator.hack.ppu.mode7.supersample);
	emulator->configure("Hacks/PPU/Mode7/Mosaic",        settings.emulator.hack.ppu.mode7.mosaic);
	emulator->configure("Hacks/DSP/Fast",                fastDSP);
	emulator->configure("Hacks/DSP/Cubic",               settings.emulator.hack.dsp.cubic);
	emulator->configure("Hacks/Coprocessor/DelayedSync", coprocessorDelayedSync);
}

// Slightly refactored by MT.
auto Program::hackPatchMemory(vector<uint8_t>& data) -> void {
	if (superFamicom.title == "Satellaview BS-X" && data.size() >= 0x100000) {
		//BS-X: Sore wa Namae o Nusumareta Machi no Monogatari (JPN) (1.1)
		//disable limited play check for BS Memory flash cartridges
		//benefit: allow locked out BS Memory flash games to play without manual header patching
		//detriment: BS Memory ROM cartridges will cause the game to hang in the load menu
		if (data[0x4a9b] == 0x10) {
			data[0x4a9b] = 0x80;
		}

		if (data[0x4d6d] == 0x10) {
			data[0x4d6d] = 0x80;
		}

		if (data[0x4ded] == 0x10) {
			data[0x4ded] = 0x80;
		}

		if (data[0x4e9a] == 0x10) {
			data[0x4e9a] = 0x80;
		}
	}
}