Program.cs

using System.Numerics;
using Raylib_cs;

namespace SandSimulator;

internal static class Program
{

    // STAThread is required if you deploy using NativeAOT on Windows - See https://github.com/raylib-cs/raylib-cs/issues/301
    [System.STAThread]
    public static void Main()
    {
        // Window settings
        Vector2 resolution = new Vector2(1920, 1080);
        int windowScale = 5;

        int windowWidth = (int)(resolution.X / windowScale); //400;
        int windowHeight = (int)(resolution.Y / windowScale); //250
        int targetFps = 60;

        // Initilize raylib window
        Raylib.InitWindow(width: (int)(windowWidth * windowScale), height: (int)(windowHeight * windowScale), title: "Sand Simulator");
        Raylib.SetTargetFPS(fps: targetFps);

        // Initialize GUI components
        float menuWidth = windowWidth * windowScale / 4;  // Width of the control panel
        float menuHeight = windowHeight * windowScale;
        ControlMenu controlMenu = new ControlMenu(windowWidth * windowScale - menuWidth, 0, menuWidth, menuHeight);
        Color[] selectedMaterialsColors = new Color[3];

        // Debug stuff
        bool debugEnabled = false;
        Button debugButton = new Button(10, 77, 154, 47, "Debug");

        // Initilize simulator instance
        Simulator simulator = new Simulator(width: windowWidth, height: windowHeight, scale: windowScale);
        SandType[] sandTypes = simulator.GetSandTypes;

        // Benchmark state
        string benchmarkResult = "";

        // Run main simulation loop
        while (!Raylib.WindowShouldClose())
        {
            // Debug functionality
            if (Raylib.IsKeyPressed(KeyboardKey.D))
            {
                debugEnabled = !debugEnabled;
                debugButton.IsEnabled = debugEnabled;
            }
            if (debugButton.IsClicked)
            {
                Console.WriteLine("Pressed debug button...");
            }

            // Control menu toggle
            if (controlMenu.IsMenuButtonClicked) controlMenu.IsVisible = !controlMenu.IsVisible;

            // Exit button
            if (controlMenu.exitBtn.IsLeftClicked) break;

            // Press B to run benchmark or click benchmark button
            if (Raylib.IsKeyPressed(KeyboardKey.B) || controlMenu.benchmarkBtn.IsLeftClicked)
            {
                Raylib.SetTargetFPS(fps: 999); // Unlock FPS for benchmark
                var (ms, frames) = simulator.RunBenchmark(sandCount: 50000, frames: 500);
                benchmarkResult = $"{frames} frames: {ms:F0}ms ({ms / frames:F2}ms/frame)";
                Console.WriteLine(benchmarkResult);
                Raylib.SetTargetFPS(fps: targetFps); // Set it back to previous value
            }

            // Press C to clear the screen or click clear button
            if (Raylib.IsKeyPressed(KeyboardKey.C) || controlMenu.clearBtn.IsLeftClicked)
            {
                Array.Fill(simulator.GetIdArray, 0);
                benchmarkResult = "";
            }

            // Material selection
            for (int i = 0; i < sandTypes.Length; i++)
            {
                controlMenu.CurrentMaterialSelection = [
                    controlMenu.materialButtons[i].IsLeftClicked ? i : controlMenu.CurrentMaterialSelection[0],
                    controlMenu.materialButtons[i].IsRightClicked ? i : controlMenu.CurrentMaterialSelection[1],
                    controlMenu.materialButtons[i].IsMiddleClicked ? i : controlMenu.CurrentMaterialSelection[2]
                ];
            }

            // Material painting
            if (!controlMenu.IsHovered)
            {
                simulator.MousePaint(sandID: sandTypes[controlMenu.CurrentMaterialSelection[0]].GetID);
                simulator.MousePaint(sandID: sandTypes[controlMenu.CurrentMaterialSelection[1]].GetID, triggerButton: MouseButton.Right);
                simulator.MousePaint(sandID: sandTypes[controlMenu.CurrentMaterialSelection[2]].GetID, triggerButton: MouseButton.Middle);
            }

            // Main simulation logic
            simulator.SimulateScene();

            // Update the texture with the newest colorArray data
            simulator.UpdateTexture();

            // Simulation vizualization
            Raylib.BeginDrawing();
            Raylib.DrawTextureEx(texture: simulator.GetTexture, position: new Vector2(0, 0), rotation: 0.0f, scale: windowScale, tint: Color.White);

            // Display GUI
            simulator.GetSandColorFromIdDict.TryGetValue(sandTypes[controlMenu.CurrentMaterialSelection[0]].GetID, out selectedMaterialsColors[0]);
            simulator.GetSandColorFromIdDict.TryGetValue(sandTypes[controlMenu.CurrentMaterialSelection[1]].GetID, out selectedMaterialsColors[1]);
            simulator.GetSandColorFromIdDict.TryGetValue(sandTypes[controlMenu.CurrentMaterialSelection[2]].GetID, out selectedMaterialsColors[2]);
            controlMenu.Draw(selectedMaterialsColors);
            if (debugEnabled) debugButton.Draw();

            // Display runtime info
            Raylib.DrawRectangle(10, 10, 154, 47, Color.LightGray);
            Raylib.DrawText("Sand Simulator", posX: 12, posY: 12, fontSize: 20, color: Color.Black);
            Raylib.DrawText($"FPS: {Raylib.GetFPS():F0}", posX: 12, posY: 36, fontSize: 20, color: Color.Black);
            if (!string.IsNullOrEmpty(benchmarkResult))
            {
                Raylib.DrawRectangle(200, 10, (int)(200 * windowScale), (int)(12 * windowScale), Color.LightGray);
                Raylib.DrawText(benchmarkResult, posX: 203, posY: 20, fontSize: (int)(10 * windowScale), color: Color.DarkGray);
            }

            Raylib.EndDrawing();
        }

        simulator.Close();
        controlMenu.Close();
        Raylib.CloseWindow();
    }
}