private void Bloom(Renderer renderer, Box <Vector2> resolution, GraphicsDevice device, Texture2D lightBuffer)
{
var screenResolution = resolution.Value;
var halfResolution = screenResolution / 2;
var quarterResolution = halfResolution / 2;
// downsample the light buffer to half resolution, and threshold at the same time
var thresholded = RenderTargetManager.GetTarget(device, (int)halfResolution.X, (int)halfResolution.Y, SurfaceFormat.Rgba64, name: "bloom thresholded");
device.SetRenderTarget(thresholded);
bloom.Parameters["Resolution"].SetValue(halfResolution);
bloom.Parameters["Threshold"].SetValue(renderer.Data.Get <float>("hdr_bloomthreshold").Value);
bloom.Parameters["MinExposure"].SetValue(renderer.Data.Get <float>("hdr_minexposure").Value);
bloom.Parameters["MaxExposure"].SetValue(renderer.Data.Get <float>("hdr_maxexposure").Value);
bloom.Parameters["Texture"].SetValue(lightBuffer);
bloom.Parameters["Luminance"].SetValue(adaptedLuminance[current]);
bloom.CurrentTechnique = bloom.Techniques["ThresholdDownsample2X"];
quad.Draw(bloom);
// downsample again to quarter resolution
var downsample = RenderTargetManager.GetTarget(device, (int)quarterResolution.X, (int)quarterResolution.Y, SurfaceFormat.Rgba64, name: "bloom downsampled");
device.SetRenderTarget(downsample);
bloom.Parameters["Resolution"].SetValue(quarterResolution);
bloom.Parameters["Texture"].SetValue(thresholded);
bloom.CurrentTechnique = bloom.Techniques["Scale"];
quad.Draw(bloom);
// blur the target
var blurred = RenderTargetManager.GetTarget(device, (int)quarterResolution.X, (int)quarterResolution.Y, SurfaceFormat.Rgba64, name: "bloom blurred");
gaussian.Blur(downsample, blurred, renderer.Data.Get <float>("hdr_bloomblurammount").Value);
// upscale back to half resolution
device.SetRenderTarget(thresholded);
bloom.Parameters["Resolution"].SetValue(halfResolution);
bloom.Parameters["Texture"].SetValue(blurred);
quad.Draw(bloom);
// output result
Output("bloom", thresholded);
// cleanup temp render targets
RenderTargetManager.RecycleTarget(downsample);
RenderTargetManager.RecycleTarget(blurred);
}
