conditional high DPI window + proper text on retina display with Raylib and zig

raylib_zig_high_dpi_ttf.zig

const rl = @cImport(@cInclude("raylib.h"));
const std = @import("std");

fn isHighDpi() bool {
    rl.SetConfigFlags(rl.FLAG_WINDOW_HIDDEN);
    rl.InitWindow(100, 100, "");

    const high_dpi = rl.GetWindowScaleDPI().x > 1.0;
    rl.CloseWindow();
    return high_dpi;
}

pub fn main() anyerror!void {
    const screenWidth = 640;
    const screenHeight = 480;

    var flags: u32 = rl.FLAG_VSYNC_HINT | rl.FLAG_WINDOW_RESIZABLE | rl.FLAG_MSAA_4X_HINT;
    const high_dpi = isHighDpi();
    if (high_dpi) {
        flags |= rl.FLAG_WINDOW_HIGHDPI;
    }
    rl.ClearWindowState(rl.FLAG_WINDOW_HIDDEN);
    rl.SetConfigFlags(flags);
    rl.InitWindow(screenWidth, screenHeight, "Conditional high DPI text test");

    defer rl.CloseWindow();

    rl.SetTargetFPS(60);

    const base_font_size: f32 = 72.0;
    const multiplier: f32 = if (high_dpi) 2.0 else 1.0;
    const scaled_font_size = base_font_size * multiplier;
    const custom_font = rl.LoadFontEx("DMSerifText-Regular.ttf", @intFromFloat(scaled_font_size), 0, 0);

    while (!rl.WindowShouldClose()) {
        rl.BeginDrawing();
        defer rl.EndDrawing();

        rl.ClearBackground(rl.RAYWHITE);
        rl.DrawTextEx(custom_font, "hello, world", rl.Vector2{ .x = 10.0, .y = 40.0 }, base_font_size, // Not scaled
            0, rl.BLACK);
        rl.DrawFPS(10, 10);
    }
}