feat: backporting existing raylib-cs examples and new official raylib examples to WASM, adopting raylib's original code style

Examples/Core/HighDpiTestbed.cs

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+/*******************************************************************************************
+*
+*   raylib [core] example - highdpi testbed
+*
+*   Example complexity rating: [★☆☆☆] 1/4
+*
+*   Example originally created with raylib 6.0, last time updated with raylib 6.0
+*
+*   Example contributed by Ramon Santamaria (@raysan5) and reviewed by Ramon Santamaria (@raysan5)
+*
+*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+*   BSD-like license that allows static linking with closed source software
+*
+*   Copyright (c) 2025 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+using System;
+using System.Numerics;
+using static Raylib_cs.Raylib;
+
+namespace Examples.Core;
+
+[ExcludeFromBrowser("fullscreen/borderless/monitor APIs are meaningless on the fixed wasm canvas")]
+public partial class HighDpiTestbed : IExample
+{
+    private const int screenWidth = 800;
+    private const int screenHeight = 450;
+
+    public string Name => "Core / High DPI Testbed";
+
+    public string Title => "raylib [core] example - highdpi testbed";
+
+    public ConfigFlags ConfigFlags => ConfigFlags.ResizableWindow | ConfigFlags.HighDpiWindow;
+
+    private Vector2 scaleDpi;
+    private Vector2 mousePos;
+    private int currentMonitor;
+    private Vector2 windowPos;
+
+    private int gridSpacing;   // Grid spacing in pixels
+
+    public void Init()
+    {
+        scaleDpi = GetWindowScaleDPI();
+        mousePos = GetMousePosition();
+        currentMonitor = GetCurrentMonitor();
+        windowPos = GetWindowPosition();
+
+        gridSpacing = 40;
+    }
+
+    public void Update()
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        mousePos = GetMousePosition();
+        currentMonitor = GetCurrentMonitor();
+        scaleDpi = GetWindowScaleDPI();
+        windowPos = GetWindowPosition();
+
+        if (IsKeyPressed(KeyboardKey.Space))
+        {
+            ToggleBorderlessWindowed();
+        }
+        if (IsKeyPressed(KeyboardKey.F))
+        {
+            ToggleFullscreen();
+        }
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+        ClearBackground(Color.RayWhite);
+
+        // Draw grid
+        for (int h = 0; h < GetScreenHeight() / gridSpacing + 1; h++)
+        {
+            DrawText($"{h * gridSpacing:D2}", 4, h * gridSpacing - 4, 10, Color.Gray);
+            DrawLine(24, h * gridSpacing, GetScreenWidth(), h * gridSpacing, Color.LightGray);
+        }
+        for (int v = 0; v < GetScreenWidth() / gridSpacing + 1; v++)
+        {
+            DrawText($"{v * gridSpacing:D2}", v * gridSpacing - 10, 4, 10, Color.Gray);
+            DrawLine(v * gridSpacing, 20, v * gridSpacing, GetScreenHeight(), Color.LightGray);
+        }
+
+        // Draw UI info
+        DrawText($"CURRENT MONITOR: {currentMonitor + 1}/{GetMonitorCount()} ({GetMonitorWidth(currentMonitor)}x{GetMonitorHeight(currentMonitor)})", 50, 50, 20, Color.DarkGray);
+        DrawText($"WINDOW POSITION: {(int)windowPos.X}x{(int)windowPos.Y}", 50, 90, 20, Color.DarkGray);
+        DrawText($"SCREEN SIZE: {GetScreenWidth()}x{GetScreenHeight()}", 50, 130, 20, Color.DarkGray);
+        DrawText($"RENDER SIZE: {GetRenderWidth()}x{GetRenderHeight()}", 50, 170, 20, Color.DarkGray);
+        DrawText($"SCALE FACTOR: {scaleDpi.X:F2}x{scaleDpi.Y:F2}", 50, 210, 20, Color.Gray);
+
+        // Draw reference rectangles, top-left and bottom-right corners
+        DrawRectangle(0, 0, 30, 60, Color.Red);
+        DrawRectangle(GetScreenWidth() - 30, GetScreenHeight() - 60, 30, 60, Color.Blue);
+
+        // Draw mouse position
+        DrawCircleV(GetMousePosition(), 20, Color.Maroon);
+        DrawRectangleRec(new Rectangle(mousePos.X - 25, mousePos.Y, 50, 2), Color.Black);
+        DrawRectangleRec(new Rectangle(mousePos.X, mousePos.Y - 25, 2, 50), Color.Black);
+        DrawText($"[{GetMouseX()},{GetMouseY()}]", (int)mousePos.X - 44,
+            (mousePos.Y > GetScreenHeight() - 60) ? (int)mousePos.Y - 46 : (int)mousePos.Y + 30, 20, Color.Black);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    public void Unload()
+    {
+        // TODO: Unload all loaded resources at this point
+    }
+
+    public static int Main()
+    {
+        // Initialization
+        //--------------------------------------------------------------------------------------
+        SetConfigFlags(ConfigFlags.ResizableWindow | ConfigFlags.HighDpiWindow);
+        InitWindow(screenWidth, screenHeight, "raylib [core] example - highdpi testbed");
+
+        SetTargetFPS(60);
+        //--------------------------------------------------------------------------------------
+
+        var game = new HighDpiTestbed();
+        game.Init();
+
+        // Main game loop
+        while (!WindowShouldClose())    // Detect window close button or ESC key
+        {
+            game.Update();
+        }
+
+        game.Unload();
+
+        // De-Initialization
+        //--------------------------------------------------------------------------------------
+        CloseWindow();        // Close window and OpenGL context
+        //--------------------------------------------------------------------------------------
+
+        return 0;
+    }
+}