Mandlebrot on Xbox 360 (XNA).

[Agent766]

I want to learn how to generate a Mandelbrot fractal on the X360. Problem is, I'm not sure how to (at least somewhat) efficiently draw the pixels to the screen. Any brilliant ides?

[turb_]

I know XNA is probably muchly different, but when I need to efficiently render a Bitmap in C#, I use unsafe code to write to the raw bytes.

You [B][I]might[/I][/B] be able to do a similar thing with XNA, but I'm no expert in XNA.

Here's what I do:

        void foo()
        {
            BitmapData bd = bmp.LockBits(rt.ClientRectangle, ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

            try
            {
                int stride = bd.Stride;

                unsafe
                {
                    byte* pixel = (byte*)(void*)bd.Scan0;

                    byte r, g, b;
                    for (int y = 0; y < h; y++)
                    {
                        int yPos = y * stride;

                        for (int x = 0; x < w; x++)
                        {
                            int pos = yPos + (x * 3);

                            // blue
                            pixel[pos + 0] = 127;
                            // green
                            pixel[pos + 1] = (byte)(grid1[x, y]/2D);
                            // red
                            pixel[pos + 2] = (byte)grid1[x, y];
                        }

                    }
                }
            }
            finally
            {
                bmp.UnlockBits(bd);
            }
            // do something with the bitmap here
        }

[Agent766]

Okay, I should be able to write it to a texture after that.

[echo1001]

I used XNA to display my mandelbrot.

Texture2d texture = new Texture2D(Device, 800, 600, 1, TextureUsage.None, SurfaceFormat.Color);
Color[] pixels = new Color[800 * 600];

textue.GetData<Color>(pixels);
pixels[1] = Color.Black;

texture.SetData<Color>(pixels);