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

Examples/Core/RenderTexture.cs

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+/*******************************************************************************************
+*
+*   raylib [core] example - render texture
+*
+*   Example complexity rating: [★☆☆☆] 1/4
+*
+*   Example originally created with raylib 6.0, last time updated with raylib 6.0
+*
+*   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;
+
+public partial class RenderTextureDemo : IExample
+{
+    private const int screenWidth = 800;
+    private const int screenHeight = 450;
+
+    // Define a render texture to render
+    private const int renderTextureWidth = 300;
+    private const int renderTextureHeight = 300;
+
+    public string Name => "Core / Render Texture";
+
+    public string Title => "raylib [core] example - render texture";
+
+    private RenderTexture2D target;
+    private Vector2 ballPosition;
+    private Vector2 ballSpeed;
+    private int ballRadius;
+    private float rotation;
+
+    public void Init()
+    {
+        target = LoadRenderTexture(renderTextureWidth, renderTextureHeight);
+
+        ballPosition = new Vector2(renderTextureWidth / 2.0f, renderTextureHeight / 2.0f);
+        ballSpeed = new Vector2(5.0f, 4.0f);
+        ballRadius = 20;
+
+        rotation = 0.0f;
+    }
+
+    public void Update()
+    {
+        // Update
+        //-----------------------------------------------------
+        // Ball movement logic
+        ballPosition.X += ballSpeed.X;
+        ballPosition.Y += ballSpeed.Y;
+
+        // Check walls collision for bouncing
+        if ((ballPosition.X >= (renderTextureWidth - ballRadius)) || (ballPosition.X <= ballRadius))
+        {
+            ballSpeed.X *= -1.0f;
+        }
+        if ((ballPosition.Y >= (renderTextureHeight - ballRadius)) || (ballPosition.Y <= ballRadius))
+        {
+            ballSpeed.Y *= -1.0f;
+        }
+
+        // Render texture rotation
+        rotation += 0.5f;
+        //-----------------------------------------------------
+
+        // Draw
+        //-----------------------------------------------------
+        // Draw our scene to the render texture
+        BeginTextureMode(target);
+
+        ClearBackground(Color.SkyBlue);
+
+        DrawRectangle(0, 0, 20, 20, Color.Red);
+        DrawCircleV(ballPosition, ballRadius, Color.Maroon);
+
+        EndTextureMode();
+
+        // Draw render texture to main framebuffer
+        BeginDrawing();
+
+        ClearBackground(Color.RayWhite);
+
+        // Draw our render texture with rotation applied
+        // NOTE 1: We set the origin of the texture to the center of the render texture
+        // NOTE 2: We flip vertically the texture setting negative source rectangle height
+        DrawTexturePro(target.Texture,
+            new Rectangle(0, 0, target.Texture.Width, -target.Texture.Height),
+            new Rectangle(screenWidth / 2.0f, screenHeight / 2.0f, target.Texture.Width, target.Texture.Height),
+            new Vector2(target.Texture.Width / 2.0f, target.Texture.Height / 2.0f), rotation, Color.White);
+
+        DrawText("DRAWING BOUNCING BALL INSIDE RENDER TEXTURE!", 10, screenHeight - 40, 20, Color.Black);
+
+        DrawFPS(10, 10);
+
+        EndDrawing();
+        //-----------------------------------------------------
+    }
+
+    public void Unload()
+    {
+        UnloadRenderTexture(target);
+    }
+
+    public static int Main()
+    {
+        // Initialization
+        //---------------------------------------------------------
+        InitWindow(screenWidth, screenHeight, "raylib [core] example - render texture");
+
+        SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+        //----------------------------------------------------------
+
+        var game = new RenderTextureDemo();
+        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;
+    }
+}