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#pragma once
#include "nes/util/address.hh"
namespace nes
{
class cartridge;
class mapper
{
using read_cpu_func = std::uint8_t(mapper::*)(address);
using write_cpu_func = void(mapper::*)(address, std::uint8_t);
using read_ppu_func = std::uint8_t(mapper::*)(address, std::uint8_t const* vram);
using write_ppu_func = void(mapper::*)(address, std::uint8_t* vram, std::uint8_t);
cartridge& cartridge_;
read_cpu_func read_cpu_;
write_cpu_func write_cpu_;
read_ppu_func read_ppu_;
write_ppu_func write_ppu_;
public:
static auto select(cartridge&) -> mapper;
mapper(mapper const&) = delete;
mapper(mapper&&) = delete;
auto operator=(mapper const&) -> mapper& = delete;
auto operator=(mapper&&) -> mapper& = delete;
auto read_cpu(address const addr) -> std::uint8_t
{
return (this->*read_cpu_)(addr);
}
auto write_cpu(address const addr, std::uint8_t const value) -> void
{
(this->*write_cpu_)(addr, value);
}
auto read_ppu(address const addr, std::uint8_t const* vram) -> std::uint8_t
{
return (this->*read_ppu_)(addr, vram);
}
auto write_ppu(address const addr, std::uint8_t* vram, std::uint8_t const value) -> void
{
(this->*write_ppu_)(addr, vram, value);
}
private:
explicit mapper(
cartridge& cartridge,
read_cpu_func read_cpu, write_cpu_func write_cpu,
read_ppu_func read_ppu, write_ppu_func write_ppu);
// Implementations
auto nrom_read_cpu(address) -> std::uint8_t;
auto nrom_write_cpu(address, std::uint8_t) -> void;
auto nrom_read_ppu(address, std::uint8_t const* vram) -> std::uint8_t;
auto nrom_write_ppu(address, std::uint8_t* vram, std::uint8_t) -> void;
auto nrom_mirrored_vram_address(address) const -> unsigned;
};
} // namespace nes
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