public void Draw(RenderTarget2D renderTarget, ITracingOptions tracingOptions, GameTime gameTime)
{
_shader.Begin(renderTarget);
// compute shader requires batching in power of 2, so must input next power of 2
// shader will auto. discard anything outside of texture range
var x = _pow.First(x => x >= renderTarget.Width);
var y = _pow.First(y => y >= renderTarget.Height);
var width = renderTarget.Width - 1;
var height = renderTarget.Height - 1;
// inject parameters
_shader.SetParameter("eye", tracingOptions.Camera.Position);
_shader.SetParameter("direction", tracingOptions.Camera.Direction);
_shader.SetParameter("time", (float)gameTime.TotalGameTime.TotalSeconds);
// hardcoded to chunks of 8x8 in compute shader
_shader.Execute(x / 8, y / 8, 1);
_shader.End();
}
