refactor: move emulation logic into sys

1 files changed, 44 insertions, 0 deletions

diff --git a/lib/nes/common/display.hh b/lib/nes/common/display.hh
new file mode 100644
index 0000000..ca78a85
--- /dev/null
+++ b/lib/nes/common/display.hh
@@ -0,0 +1,44 @@
+#pragma once
+
+#include "nes/common/rgb.hh"
+
+namespace nes
+{
+	class rgb;
+
+	/// Abstraction of the display logic.
+	class display
+	{
+	public:
+		static constexpr auto width = unsigned{ 256 };
+		static constexpr auto height = unsigned{ 240 };
+
+		virtual ~display() = default;
+
+		display(display const&) = delete;
+		display(display&&) = delete;
+		auto operator=(display const&) -> display& = delete;
+		auto operator=(display&&) -> display& = delete;
+
+		/// Switch between front and back buffers.
+		virtual auto switch_buffers() -> void = 0;
+		/// Update the pixel at the given position in the back buffer.
+		virtual auto set(unsigned x, unsigned y, rgb value) -> void = 0;
+		/// Load the pixel value at the given position in the back buffer.
+		virtual auto get(unsigned x, unsigned y) const -> rgb = 0;
+		/// Clear the entire back buffer with a color.
+		virtual auto clear(rgb const color) -> void
+		{
+			for (auto y = unsigned{ 0 }; y < height; ++y)
+			{
+				for (auto x = unsigned{ 0 }; x < width; ++x)
+				{
+					set(x, y, color);
+				}
+			}
+		}
+
+	protected:
+		explicit display() = default;
+	};
+} // namespace nes
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