protected override void DrawCore()
{
// Input texture
var inputTexture = GetSafeInput(0);
// Get a temporary texture for the intermediate pass
// This texture will be allocated only in the scope of this draw and returned to the pool at the exit of this method
var outputTextureH = NewScopedRenderTarget2D(inputTexture.Description);
if (offsetsWeights == null)
{
// TODO: cache if necessary
offsetsWeights = GaussianUtil.Calculate1D(Radius, SigmaRatio);
}
// Update shared parameters
Parameters.Set(GaussianBlurKeys.Count, offsetsWeights.Length);
Parameters.Set(GaussianBlurShaderKeys.OffsetsWeights, offsetsWeights);
// Horizontal pass
blurH.SetInput(inputTexture);
blurH.SetOutput(outputTextureH);
var size = Radius * 2 + 1;
blurH.Draw("GaussianBlurH{0}x{0}", size);
// Vertical pass
blurV.SetInput(outputTextureH);
blurV.SetOutput(GetSafeOutput(0));
blurV.Draw("GaussianBlurV{0}x{0}", size);
}
protected override void DrawCore()
{
var input = GetSafeInput(0);
var output = GetSafeOutput(0);
var blurTextureSize = output.Size.Down2(UpscaleCount);
var outputTextureDown = NewScopedRenderTarget2D(blurTextureSize.Width, blurTextureSize.Height, luminanceFormat, 1);
var luminanceMap = NewScopedRenderTarget2D(input.ViewWidth, input.ViewHeight, luminanceFormat, 1);
// Calculate the first luminance map
luminanceLogEffect.SetInput(input);
luminanceLogEffect.SetOutput(luminanceMap);
luminanceLogEffect.Draw();
// Downscales luminance up to BlurTexture (optional) and 1x1
multiScaler.SetInput(luminanceMap);
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();
blur.Draw();
// Upscale from intermediate to output
multiScaler.SetInput(outputTextureDown);
multiScaler.SetOutput(output);
multiScaler.Draw();
}
// Calculate average luminance only if needed
if (EnableAverageLuminanceReadback)
{
readback.Draw();
var rawLogValue = readback.Result[0];
AverageLuminance = (float)Math.Pow(2.0, rawLogValue);
}
}