implement ppu io registers

1 files changed, 31 insertions, 11 deletions

diff --git a/src/nes/mapper.hh b/src/nes/mapper.hh
index 0aec2ac..f2873a6 100644
--- a/src/nes/mapper.hh
+++ b/src/nes/mapper.hh
@@ -8,12 +8,16 @@ namespace nes
 
 	class mapper
 	{
-		using read_func = std::uint8_t(mapper::*)(address);
-		using write_func = void(mapper::*)(address, std::uint8_t);
+		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_func read_;
-		write_func write_;
+		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;
@@ -23,22 +27,38 @@ namespace nes
 		auto operator=(mapper const&) -> mapper& = delete;
 		auto operator=(mapper&&) -> mapper& = delete;
 
-		auto read(address const addr) -> std::uint8_t
+		auto read_cpu(address const addr) -> std::uint8_t
 		{
-			return (this->*read_)(addr);
+			return (this->*read_cpu_)(addr);
 		}
 
-		auto write(address const addr, std::uint8_t const value) -> void
+		auto write_cpu(address const addr, std::uint8_t const value) -> void
 		{
-			(this->*write_)(addr, value);
+			(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_func read, write_func write);
+		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(address) -> std::uint8_t;
-		auto nrom_write(address, std::uint8_t) -> void;
+		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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