From 02f963a4bab95b3a328b6a792c9a7e027ade0e26 Mon Sep 17 00:00:00 2001
From: Hannes Schulze <haschu0103@outlook.de>
Date: Mon, 13 Jan 2025 22:03:10 +0100
Subject: implement display

---
 src/nes/CMakeLists.txt      |  9 +++++++++
 src/nes/display.cc          | 16 ++++++++++++++++
 src/nes/display.hh          | 33 +++++++++++++++++++++++++++++++++
 src/nes/nes.cc              | 13 +++++++++++++
 src/nes/nes.hh              | 19 +++++++++++++++++++
 src/nes/util/CMakeLists.txt |  4 ++++
 src/nes/util/rgb.hh         | 33 +++++++++++++++++++++++++++++++++
 7 files changed, 127 insertions(+)
 create mode 100644 src/nes/CMakeLists.txt
 create mode 100644 src/nes/display.cc
 create mode 100644 src/nes/display.hh
 create mode 100644 src/nes/nes.cc
 create mode 100644 src/nes/nes.hh
 create mode 100644 src/nes/util/CMakeLists.txt
 create mode 100644 src/nes/util/rgb.hh

(limited to 'src/nes')

diff --git a/src/nes/CMakeLists.txt b/src/nes/CMakeLists.txt
new file mode 100644
index 0000000..560dcdd
--- /dev/null
+++ b/src/nes/CMakeLists.txt
@@ -0,0 +1,9 @@
+add_subdirectory(util)
+
+target_sources(
+    nes
+    PRIVATE
+        nes.hh
+        nes.cc
+        display.hh
+        display.cc)
\ No newline at end of file
diff --git a/src/nes/display.cc b/src/nes/display.cc
new file mode 100644
index 0000000..4ff1d5f
--- /dev/null
+++ b/src/nes/display.cc
@@ -0,0 +1,16 @@
+#include "nes/display.hh"
+#include "nes/util/rgb.hh"
+
+namespace nes
+{
+	auto display::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);
+			}
+		}
+	}
+} // namespace nes
\ No newline at end of file
diff --git a/src/nes/display.hh b/src/nes/display.hh
new file mode 100644
index 0000000..14ccff1
--- /dev/null
+++ b/src/nes/display.hh
@@ -0,0 +1,33 @@
+#pragma once
+
+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 color) -> void;
+
+	protected:
+		explicit display() = default;
+	};
+} // namespace nes
\ No newline at end of file
diff --git a/src/nes/nes.cc b/src/nes/nes.cc
new file mode 100644
index 0000000..c503d65
--- /dev/null
+++ b/src/nes/nes.cc
@@ -0,0 +1,13 @@
+#include "nes/nes.hh"
+#include "nes/display.hh"
+#include "nes/util/rgb.hh"
+
+namespace nes
+{
+	nes::nes(display& display)
+		: display_{ display }
+	{
+		display.clear(rgb::from_hex(0xFF0000));
+		display.switch_buffers();
+	}
+} // namespace nes
\ No newline at end of file
diff --git a/src/nes/nes.hh b/src/nes/nes.hh
new file mode 100644
index 0000000..ab975f0
--- /dev/null
+++ b/src/nes/nes.hh
@@ -0,0 +1,19 @@
+#pragma once
+
+namespace nes
+{
+	class display;
+
+	class nes
+	{
+		display& display_;
+
+	public:
+		explicit nes(display&);
+
+		nes(nes const&) = delete;
+		nes(nes&&) = delete;
+		auto operator=(nes const&) -> nes& = delete;
+		auto operator=(nes&&) -> nes& = delete;
+	};
+} // namespace nes
\ No newline at end of file
diff --git a/src/nes/util/CMakeLists.txt b/src/nes/util/CMakeLists.txt
new file mode 100644
index 0000000..c2255dd
--- /dev/null
+++ b/src/nes/util/CMakeLists.txt
@@ -0,0 +1,4 @@
+target_sources(
+    nes
+    PRIVATE
+        rgb.hh)
\ No newline at end of file
diff --git a/src/nes/util/rgb.hh b/src/nes/util/rgb.hh
new file mode 100644
index 0000000..d62c70c
--- /dev/null
+++ b/src/nes/util/rgb.hh
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <cstdint>
+
+namespace nes
+{
+	/// An RGB value.
+	class rgb
+	{
+	public:
+		explicit rgb() = default;
+
+		explicit rgb(std::uint8_t const r, std::uint8_t const g, std::uint8_t const b)
+			: r{ r }
+			, g{ g }
+			, b{ b }
+		{
+		}
+
+		static auto from_hex(std::uint32_t const hex) -> rgb
+		{
+			auto res = rgb{};
+			res.r = (hex & 0x00FF0000) >> 16;
+			res.g = (hex & 0x0000FF00) >> 8;
+			res.b = (hex & 0x000000FF) >> 0;
+			return res;
+		}
+
+		std::uint8_t r{ 0 };
+		std::uint8_t g{ 0 };
+		std::uint8_t b{ 0 };
+	};
+} // namespace nes
\ No newline at end of file
-- 
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