public static CubeMapTexture Generate(int seed, int resolution, int samples)
{
var rand = seed == 0 ? new Random() : new Random(seed);
var stars = Star.Generate(rand, rand.Next(16384, 32768));
var dusts = DustCloud.Generate(rand, rand.Next(4096, 8192));
int renderResolution = resolution * samples;
var camera = new Camera(renderResolution, renderResolution, MathHelper.PiOver2, 4f, 64f);
var starShader = new StarShader {
Camera = camera
};
var dustShader = new DustCloudShader {
Camera = camera
};
var target = new FrameBuffer(new BitmapTexture2D(new Bitmap(renderResolution, renderResolution)), 16);
var angles = new[] {
Tuple.Create(0f, MathHelper.PiOver2),
Tuple.Create(0f, -MathHelper.PiOver2),
Tuple.Create(MathHelper.PiOver2, 0f),
Tuple.Create(-MathHelper.PiOver2, 0f),
Tuple.Create(0f, 0f),
Tuple.Create(0f, MathHelper.Pi)
};
var bmps = new Bitmap[6];
target.Begin();
GL.ClearColor(Color.Black);
var bmp = new Bitmap(renderResolution, renderResolution);
for (int i = 0; i < 6; ++i)
{
camera.Pitch = angles[i].Item1;
camera.Yaw = angles[i].Item2;
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
dustShader.BeginBatch();
foreach (var dust in dusts)
{
dustShader.Render(dust);
}
dustShader.EndBatch();
starShader.BeginBatch();
foreach (var star in stars)
{
starShader.Render(star);
}
starShader.EndBatch();
var data = bmp.LockBits(new Rectangle(0, 0, renderResolution, renderResolution), ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
GL.ReadPixels(0, 0, renderResolution, renderResolution, OpenTK.Graphics.OpenGL.PixelFormat.Bgra, PixelType.UnsignedByte, data.Scan0);
bmp.UnlockBits(data);
bmps[i] = new Bitmap(bmp, new Size(resolution, resolution));
}
bmp.Dispose();
target.End();
target.Dispose();
return(new CubeMapTexture(bmps[0], bmps[1], bmps[2], bmps[3], bmps[4], bmps[5]));
}
