protected override void DrawCore(RenderContext context)
{
var input = GetSafeInput(0);
var output = GetSafeOutput(0);
// Render the luminance to a power-of-two target, so we preserve energy on downscaling
var startWidth = Math.Max(1, Math.Min(MathUtil.NextPowerOfTwo(input.Size.Width), MathUtil.NextPowerOfTwo(input.Size.Height)) / 2);
var startSize = new Size3(startWidth, startWidth, 1);
var blurTextureSize = startSize.Down2(UpscaleCount);
Texture outputTextureDown = null;
if (blurTextureSize.Width != 1 && blurTextureSize.Height != 1)
{
outputTextureDown = NewScopedRenderTarget2D(blurTextureSize.Width, blurTextureSize.Height, luminanceFormat, 1);
}
var luminanceMap = NewScopedRenderTarget2D(startSize.Width, startSize.Height, luminanceFormat, 1);
// Calculate the first luminance map
luminanceLogEffect.SetInput(input);
luminanceLogEffect.SetOutput(luminanceMap);
luminanceLogEffect.Draw(context);
// Downscales luminance up to BlurTexture (optional) and 1x1
multiScaler.SetInput(luminanceMap);
if (outputTextureDown == null)
{
multiScaler.SetOutput(luminance1x1);
}
else
{
multiScaler.SetOutput(outputTextureDown, luminance1x1);
}
multiScaler.Draw();
// If we have an output texture
if (outputTextureDown != null)
{
// Blur x2 the intermediate output texture
blur.SetInput(outputTextureDown);
blur.SetOutput(outputTextureDown);
blur.Draw(context);
blur.Draw(context);
// Upscale from intermediate to output
multiScaler.SetInput(outputTextureDown);
multiScaler.SetOutput(output);
multiScaler.Draw(context);
}
else
{
// TODO: Workaround to that the output filled with 1x1
Scaler.SetInput(luminance1x1);
Scaler.SetOutput(output);
Scaler.Draw(context);
}
// Calculate average luminance only if needed
if (EnableAverageLuminanceReadback)
{
readback.SetInput(luminance1x1);
readback.Draw();
var rawLogValue = readback.Result[0];
AverageLuminance = (float)Math.Pow(2.0, rawLogValue);
// In case AvergaeLuminance go crazy because of halp float/infinity precision, some code to save the values here:
//if (float.IsInfinity(AverageLuminance))
//{
// using (var stream = new FileStream("luminance_input.dds", FileMode.Create, FileAccess.Write))
// {
// input.Save(stream, ImageFileType.Dds);
// }
// using (var stream = new FileStream("luminance.dds", FileMode.Create, FileAccess.Write))
// {
// luminanceMap.Save(stream, ImageFileType.Dds);
// }
//}
}
}
protected override void DrawCore(RenderContext context)
{
var input = GetInput(0);
var output = GetOutput(0) ?? input;
if (input == null)
{
return;
}
// If afterimage is active, add some persistence to the brightness
if (afterimage.Enabled)
{
var persistenceBrightness = NewScopedRenderTarget2D(input.Description);
afterimage.SetInput(0, input);
afterimage.SetOutput(persistenceBrightness);
afterimage.Draw(context);
input = persistenceBrightness;
}
// A distortion can be applied to the bloom effect to simulate anamorphic lenses
if (Distortion.X > 1f || Distortion.Y > 1f)
{
int distortedWidth = (int)Math.Max(1, input.Description.Width / Distortion.X);
int distortedHeight = (int)Math.Max(1, input.Description.Height / Distortion.Y);
var anamorphicInput = NewScopedRenderTarget2D(distortedWidth, distortedHeight, input.Format);
Scaler.SetInput(input);
Scaler.SetOutput(anamorphicInput);
Scaler.Draw(context, "Anamorphic distortion");
input = anamorphicInput;
}
// ----------------------------------------
// Downscale / 4
// ----------------------------------------
const int DownScaleBasis = 1;
var nextSize = input.Size.Down2(DownScaleBasis);
var inputTextureDown4 = NewScopedRenderTarget2D(nextSize.Width, nextSize.Height, input.Format);
Scaler.SetInput(input);
Scaler.SetOutput(inputTextureDown4);
Scaler.Draw(context, "Down/4");
var blurTexture = inputTextureDown4;
// TODO: Support automatic additional downscales based on a quality parameter instead
// Additional downscales
if (DownScale > 0)
{
nextSize = nextSize.Down2(DownScale);
blurTexture = NewScopedRenderTarget2D(nextSize.Width, nextSize.Height, input.Format);
multiScaler.SetInput(inputTextureDown4);
multiScaler.SetOutput(blurTexture);
multiScaler.Draw(context);
}
// Max blur size no more than 1/4 of input size
var inputMaxBlurRadiusInPixels = 0.25 * Math.Max(input.Width, input.Height) * Math.Pow(2, -DownScaleBasis - DownScale);
blur.Radius = Math.Max(1, (int)MathUtil.Lerp(1, inputMaxBlurRadiusInPixels, Math.Max(0, Radius / 100.0f)));
blur.SigmaRatio = Math.Max(1.0f, SigmaRatio);
blur.SetInput(blurTexture);
blur.SetOutput(blurTexture);
blur.Draw(context);
// TODO: Support automatic additional downscales
if (DownScale > 0)
{
multiScaler.SetInput(blurTexture);
multiScaler.SetOutput(inputTextureDown4);
multiScaler.Draw(context);
}
// Copy the input texture to the output
if (ShowOnlyMip || ShowOnlyBloom)
{
GraphicsDevice.Clear(output, Color.Black);
}
// Switch to additive
GraphicsDevice.SetBlendState(GraphicsDevice.BlendStates.Additive);
Scaler.Color = new Color4(Amount);
Scaler.SetInput(inputTextureDown4);
Scaler.SetOutput(output);
Scaler.Draw(context);
Scaler.Reset();
GraphicsDevice.SetBlendState(GraphicsDevice.BlendStates.Default);
}