1 files changed, 63 insertions, 0 deletions
diff --git a/lib/nes/util/snapshot.hh b/lib/nes/util/snapshot.hh
new file mode 100644
index 0000000..de23a46
--- /dev/null
+++ b/lib/nes/util/snapshot.hh
@@ -0,0 +1,63 @@
+#pragma once
+
+#include "nes/util/cycle-count.hh"
+#include <vector>
+#include <cstdint>
+
+namespace nes
+{
+	/// System snapshot used for comparison with a reference implementation.
+	struct snapshot
+	{
+		explicit snapshot() = default;
+
+		cycle_count cpu_cycle;
+		cycle_count ppu_cycle;
+		std::vector<std::uint8_t> ram;
+		std::vector<std::uint8_t> sram;
+		std::vector<std::uint8_t> vram;
+		std::vector<std::uint8_t> oam;
+		struct
+		{
+			std::uint16_t pc{};
+			std::uint8_t sp{};
+			std::uint8_t a{};
+			std::uint8_t x{};
+			std::uint8_t y{};
+			std::uint8_t p{};
+			bool c{};
+			bool z{};
+			bool i{};
+			bool d{};
+			bool b{};
+			bool v{};
+			bool n{};
+		} registers{};
+	};
+
+	inline auto operator==(snapshot const& a, snapshot const& b) -> bool
+	{
+		if (a.cpu_cycle != b.cpu_cycle) { return false; }
+		if (a.ppu_cycle != b.ppu_cycle) { return false; }
+		if (a.ram != b.ram) { return false; }
+		if (a.sram != b.sram) { return false; }
+		if (a.vram != b.vram) { return false; }
+		if (a.oam != b.oam) { return false; }
+		if (a.registers.pc != b.registers.pc) { return false; }
+		if (a.registers.sp != b.registers.sp) { return false; }
+		if (a.registers.a != b.registers.a) { return false; }
+		if (a.registers.x != b.registers.x) { return false; }
+		if (a.registers.y != b.registers.y) { return false; }
+		if (a.registers.p != b.registers.p) { return false; }
+		if (a.registers.c != b.registers.c) { return false; }
+		if (a.registers.z != b.registers.z) { return false; }
+		if (a.registers.i != b.registers.i) { return false; }
+		if (a.registers.d != b.registers.d) { return false; }
+		if (a.registers.b != b.registers.b) { return false; }
+		if (a.registers.v != b.registers.v) { return false; }
+		if (a.registers.n != b.registers.n) { return false; }
+		return true;
+	}
+
+	inline auto operator!=(snapshot const& a, snapshot const& b) -> bool { return !(a == b); }
+} // namespace nes
+\ No newline at end of file