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

Examples/Core/HighDpiDemo.cs

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+/*******************************************************************************************
+*
+*   raylib [core] example - highdpi demo
+*
+*   Example complexity rating: [★★☆☆] 2/4
+*
+*   Example originally created with raylib 5.0, last time updated with raylib 5.5
+*
+*   Example contributed by Jonathan Marler (@marler8997) 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 Jonathan Marler (@marler8997)
+*
+********************************************************************************************/
+
+using System;
+using System.Numerics;
+using static Raylib_cs.Raylib;
+
+namespace Examples.Core;
+
+[ExcludeFromBrowser("monitor/DPI APIs are meaningless on the fixed wasm canvas")]
+public partial class HighDpiDemo : IExample
+{
+    private const int screenWidth = 800;
+    private const int screenHeight = 450;
+
+    public string Name => "Core / High DPI Demo";
+
+    public string Title => "raylib [core] example - highdpi demo";
+
+    public ConfigFlags ConfigFlags => ConfigFlags.HighDpiWindow | ConfigFlags.ResizableWindow;
+
+    private int logicalGridDescY;
+    private int logicalGridLabelY;
+    private int logicalGridTop;
+    private int logicalGridBottom;
+    private int pixelGridTop;
+    private int pixelGridBottom;
+    private int pixelGridLabelY;
+    private int pixelGridDescY;
+    private int cellSize;
+    private float cellSizePx;
+
+    public void Init()
+    {
+        SetWindowMinSize(450, 450);
+
+        logicalGridDescY = 120;
+        logicalGridLabelY = logicalGridDescY + 30;
+        logicalGridTop = logicalGridLabelY + 30;
+        logicalGridBottom = logicalGridTop + 80;
+        pixelGridTop = logicalGridBottom - 20;
+        pixelGridBottom = pixelGridTop + 80;
+        pixelGridLabelY = pixelGridBottom + 30;
+        pixelGridDescY = pixelGridLabelY + 30;
+        cellSize = 50;
+        cellSizePx = (float)cellSize;
+    }
+
+    public void Update()
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        int monitorCount = GetMonitorCount();
+
+        if ((monitorCount > 1) && IsKeyPressed(KeyboardKey.N))
+        {
+            SetWindowMonitor((GetCurrentMonitor() + 1) % monitorCount);
+        }
+
+        int currentMonitor = GetCurrentMonitor();
+        Vector2 dpiScale = GetWindowScaleDPI();
+        cellSizePx = ((float)cellSize) / dpiScale.X;
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+        ClearBackground(Color.RayWhite);
+
+        int windowCenter = GetScreenWidth() / 2;
+        DrawTextCenter($"Dpi Scale: {dpiScale.X:F6}", windowCenter, 30, 40, Color.DarkGray);
+        DrawTextCenter($"Monitor: {currentMonitor + 1}/{monitorCount} ([N] next monitor)", windowCenter, 70, 20, Color.LightGray);
+        DrawTextCenter($"Window is {GetScreenWidth()} \"logical points\" wide", windowCenter, logicalGridDescY, 20, Color.Orange);
+
+        bool odd = true;
+        for (int i = cellSize; i < GetScreenWidth(); i += cellSize, odd = !odd)
+        {
+            if (odd)
+            {
+                DrawRectangle(i, logicalGridTop, cellSize, logicalGridBottom - logicalGridTop, Color.Orange);
+            }
+
+            DrawTextCenter($"{i}", i, logicalGridLabelY, 10, Color.LightGray);
+            DrawLine(i, logicalGridLabelY + 10, i, logicalGridBottom, Color.Gray);
+        }
+
+        odd = true;
+        const int minTextSpace = 30;
+        int lastTextX = -minTextSpace;
+        for (int i = cellSize; i < GetRenderWidth(); i += cellSize, odd = !odd)
+        {
+            int x = (int)(((float)i) / dpiScale.X);
+            if (odd)
+            {
+                DrawRectangle(x, pixelGridTop, (int)cellSizePx, pixelGridBottom - pixelGridTop, new Color(0, 121, 241, 100));
+            }
+
+            DrawLine(x, pixelGridTop, (int)(((float)i) / dpiScale.X), pixelGridLabelY - 10, Color.Gray);
+
+            if ((x - lastTextX) >= minTextSpace)
+            {
+                DrawTextCenter($"{i}", x, pixelGridLabelY, 10, Color.LightGray);
+                lastTextX = x;
+            }
+        }
+
+        DrawTextCenter($"Window is {GetRenderWidth()} \"physical pixels\" wide", windowCenter, pixelGridDescY, 20, Color.Blue);
+
+        string text = "Can you see this?";
+        Vector2 size = MeasureTextEx(GetFontDefault(), text, 20, 3);
+        Vector2 pos = new Vector2(GetScreenWidth() - size.X - 5, GetScreenHeight() - size.Y - 5);
+        DrawTextEx(GetFontDefault(), text, pos, 20, 3, Color.LightGray);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    public void Unload()
+    {
+    }
+
+    // Draw text centered on the given position
+    private static void DrawTextCenter(string text, int x, int y, int fontSize, Color color)
+    {
+        Vector2 size = MeasureTextEx(GetFontDefault(), text, (float)fontSize, 3);
+        Vector2 pos = new Vector2(x - size.X / 2, y - size.Y / 2);
+        DrawTextEx(GetFontDefault(), text, pos, (float)fontSize, 3, color);
+    }
+
+    public static int Main()
+    {
+        // Initialization
+        //--------------------------------------------------------------------------------------
+        SetConfigFlags(ConfigFlags.HighDpiWindow | ConfigFlags.ResizableWindow);
+        InitWindow(screenWidth, screenHeight, "raylib [core] example - highdpi demo");
+
+        SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+        //--------------------------------------------------------------------------------------
+
+        var game = new HighDpiDemo();
+        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;
+    }
+}