refactor: move emulation logic into sys

1 files changed, 65 insertions, 0 deletions

diff --git a/lib/nes/sys/nes.cc b/lib/nes/sys/nes.cc
new file mode 100644
index 0000000..f922b7d
--- /dev/null
+++ b/lib/nes/sys/nes.cc
@@ -0,0 +1,65 @@
+#include "nes/sys/nes.hh"
+#include "nes/sys/types/snapshot.hh"
+#include "nes/common/display.hh"
+#include "nes/common/rgb.hh"
+
+namespace nes
+{
+	nes::nes(cartridge cartridge, display& display)
+		: cartridge_{ std::move(cartridge) }
+		, display_{ display }
+		, ppu_{ cpu_, cartridge_, display_ }
+		, cpu_{ ppu_, cartridge_, controller_1_, controller_2_ }
+		, status_{ cartridge_.get_status() }
+	{
+		display_.clear(rgb{});
+		display_.switch_buffers();
+		display_.clear(rgb{});
+	}
+
+	auto nes::step(std::chrono::microseconds const delta) -> void
+	{
+		step(cycle_count::from_duration(delta));
+	}
+
+	auto nes::step() -> void
+	{
+		if (get_status() != status::success) { return; }
+
+		status_ = cpu_.step();
+		while (ppu_.get_cycles() < cpu_.get_cycles())
+		{
+			ppu_.step();
+		}
+	}
+
+	auto nes::step(cycle_count const delta) -> void
+	{
+		current_cycles_ += delta;
+		while (cpu_.get_cycles() < current_cycles_ && get_status() == status::success)
+		{
+			step();
+		}
+	}
+
+	auto nes::step_to_nmi() -> void
+	{
+		while (cpu_.is_nmi_pending())
+		{
+			step();
+		}
+		while (!cpu_.is_nmi_pending())
+		{
+			step();
+		}
+	}
+
+	auto nes::get_snapshot() -> snapshot
+	{
+		auto res = snapshot{};
+		res.sram = std::vector(cartridge_.get_ram(), cartridge_.get_ram() + cartridge_.get_ram_length());
+		cpu_.build_snapshot(res);
+		ppu_.build_snapshot(res);
+		return res;
+	}
+} // namespace nes
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