From 84ab1731e43f290d535dae87081fbff0896cf95c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Maciej=20Krzy=C5=BCanowski?= <krzmaciek@gmail.com>
Date: Tue, 17 Sep 2024 18:59:16 +0200
Subject: [PATCH] VGA draft

---
 src/vga.zig | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 src/vga.zig

diff --git a/src/vga.zig b/src/vga.zig
new file mode 100644
index 0000000..8b8aac9
--- /dev/null
+++ b/src/vga.zig
@@ -0,0 +1,110 @@
+const std = @import("std");
+
+const Color = enum(u4) {
+    black = 0,
+    blue = 1,
+    green = 2,
+    cyan = 3,
+    red = 4,
+    magenta = 5,
+    brown = 6,
+    light_grey = 7,
+    dark_grey = 8,
+    light_blue = 9,
+    light_green = 10,
+    light_cyan = 11,
+    light_red = 12,
+    light_magenta = 13,
+    light_brown = 14,
+    white = 15,
+};
+
+const Cell = struct {
+    text_color: Color,
+    background_color: Color,
+    character: u8,
+
+    pub fn init(text_color: Color, background_color: Color, character: u8) Cell {
+        return Cell{
+            .text_color = text_color,
+            .background_color = background_color,
+            .character = character,
+        };
+    }
+
+    pub fn default(character: u8) Cell {
+        return Cell.init(Color.white, Color.black, character);
+    }
+
+    pub fn solid(background_color: Color) Cell {
+        return Cell.init(Color.white, background_color, ' ');
+    }
+
+    pub fn encode(self: Cell) u16 {
+        const result: u16 = 0;
+
+        result |= (self.background_color << 12);
+        result |= (self.text_color << 8);
+        result |= (self.character);
+
+        return result;
+    }
+};
+
+const Position = struct {
+    x: u32,
+    y: u32,
+
+    pub fn init(x: u32, y: u32) Position {
+        return Position{
+            .x = x,
+            .y = y,
+        };
+    }
+};
+
+const Screen = struct {
+    pub const width = 80;
+    pub const height = 25;
+    pub const base_addr = 0xB8000;
+
+    cursor_position: Position,
+
+    pub fn init() Screen {
+        return Screen{
+            .cursor_position = Position.init(0, 0),
+        };
+    }
+
+    pub fn put_at(position: Position, cell: Cell) void {
+        unreachable;
+    }
+
+    pub fn fill(cell: Cell) void {
+        unreachable;
+    }
+
+    pub fn clear() void {
+        unreachable;
+    }
+
+    pub fn new_line() void {
+        unreachable;
+    }
+
+    pub fn put_char(self: Screen, cell: Cell) void {
+        unreachable;
+    }
+
+    pub fn put_str(self: Screen, str: []const u8) void {
+        unreachable;
+    }
+
+    pub fn print(self: Screen, format: []const u8, args: anytype) void {
+        unreachable;
+    }
+
+    pub fn println(self: Screen, format: []const u8, args: anytype) void {
+        unreachable;
+    }
+};