using System.Runtime.CompilerServices;
using Raylib_cs;

class SoftwareRasterizer
{
    
    const int screenWidth = 1280 * 2;
    const int screenHeight = 800 * 2;

    const int scale = 8;

    private RenderDevice renderer;
    
    static void Main()
    {
        SoftwareRasterizer sr = new SoftwareRasterizer();
        sr.start();
    }

    struct BouncingPoint()
    {
        float posX, posY;
        float velX, velY;


        public  float2 pos => new(posX, posY);

        public BouncingPoint(float posX, float posY, float velX, float velY) : this()
        {
            this.posX = posX;
            this.posY = posY;
            this.velX = velX;
            this.velY = velY;
        }
        public void Update()
        {
            posX += velX;
            posY += velY;

            if (posX >= 1.0 || posX <= -1.0f)
            {
                velX = -velX;
            }

            if (posY >= 1.0 || posY <= -1.0f)
            {
                velY = -velY;
            }
        }
    }

    public void start()
    {
        
        Raylib.InitWindow(screenWidth, screenHeight, "Software Rasterizer");
        Raylib.SetTargetFPS(60);

        renderer = new RenderDevice(screenWidth / scale, screenHeight / scale, screenWidth, screenHeight);
        
        VertexColorShader shader = new VertexColorShader();

        int frameCounter = 0;

        Random rand = new Random();
        
        BouncingPoint v0 = new BouncingPoint( 0.0f,  0.8f, 0.01f, 0.01f);  // Top middle
        BouncingPoint v1 = new BouncingPoint( 0.8f, -0.8f, 0.01f, -0.01f);  // Bottom right
        BouncingPoint v2 = new BouncingPoint(-0.8f, -0.8f, -0.01f, 0.01f);  // Bottom left
        
        while (!Raylib.WindowShouldClose())
        {
            
            renderer.Clear();

            v0.Update();
            v1.Update();
            v2.Update();

            renderer.DrawTriangle(v0.pos, v1.pos, v2.pos, shader);
            // Render
            Raylib.BeginDrawing();
            Raylib.ClearBackground(Color.Black);
            //
            renderer.render();
            //
            Raylib.DrawText($"FPS: {Raylib.GetFPS()}", 10, 10, 20, Color.White);
            Raylib.EndDrawing();
            frameCounter += 2;
        }

        // Cleanup
        renderer.cleanup();
        Raylib.CloseWindow();
    }

    

    
}