private void GenerateBackground(Random rng, int width, int height)
{
const int noiseSize = 256;
var starTexture = GeneratePointStarTexture(rng, width, height);
var noiseTexture = GenerateNoise(rng, noiseSize);
if (Nebulae != null && Nebulae.Length > 0)
{
_material = new Material(Shader, ColorRgba.White, starTexture);
using (var renderTarget = new RenderTarget(AAQuality.Off, starTexture))
using (var device = new DrawDevice())
{
device.Perspective = PerspectiveMode.Flat;
device.VisibilityMask = VisibilityFlag.AllGroups | VisibilityFlag.ScreenOverlay;
device.RenderMode = RenderMatrix.OrthoScreen;
device.Target = renderTarget;
device.ViewportRect = new Rect(renderTarget.Width, renderTarget.Height);
device.PrepareForDrawcalls();
var canvas = new Canvas(device);
canvas.State.SetMaterial(_material);
foreach (var n in Nebulae.Select(n => n.Res).Where(n => n != null))
{
_material.SetTexture("source", starTexture);
_material.SetTexture("noise", starTexture);
_material.SetUniform("color", 255f / n.Color.R, 255f / n.Color.G, 255f / n.Color.B);
_material.SetUniform("offset", n.Offset.X, n.Offset.Y);
_material.SetUniform("scale", n.Scale);
_material.SetUniform("density", n.Density);
_material.SetUniform("falloff", n.Falloff);
_material.SetUniform("tNoiseSize", noiseSize);
canvas.DrawRect(0, 0, width, height);
device.Render(ClearFlag.None, ColorRgba.TransparentBlack, 1.0f);
}
}
}
}
